compiler.hpp

// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

/*XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
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XX                                                                           XX
XX                    Inline functions                                       XX
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*/

#ifndef _COMPILER_HPP_
#define _COMPILER_HPP_

#include "emit.h" // for emitter::emitAddLabel

#include "bitvec.h"

#include "compilerbitsettraits.hpp"

/*
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
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XX                                                                           XX
XX  Miscellaneous utility functions. Some of these are defined in Utils.cpp  XX
XX                                                                           XX
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*/

/*****************************************************************************/
/*****************************************************************************/

inline bool getInlinePInvokeEnabled()
{
#ifdef DEBUG
    return JitConfig.JitPInvokeEnabled() && !JitConfig.StressCOMCall();
#else
    return true;
#endif
}

inline bool getInlinePInvokeCheckEnabled()
{
#ifdef DEBUG
    return JitConfig.JitPInvokeCheckEnabled() != 0;
#else
    return false;
#endif
}

// Enforce float narrowing for buggy compilers (notably preWhidbey VC)
inline float forceCastToFloat(double d)
{
    Volatile<float> f = (float)d;
    return f;
}

// Enforce UInt32 narrowing for buggy compilers (notably Whidbey Beta 2 LKG)
inline UINT32 forceCastToUInt32(double d)
{
    Volatile<UINT32> u = (UINT32)d;
    return u;
}

enum RoundLevel
{
    ROUND_NEVER     = 0, // Never round
    ROUND_CMP_CONST = 1, // Round values compared against constants
    ROUND_CMP       = 2, // Round comparands and return values
    ROUND_ALWAYS    = 3, // Round always

    COUNT_ROUND_LEVEL,
    DEFAULT_ROUND_LEVEL = ROUND_NEVER
};

inline RoundLevel getRoundFloatLevel()
{
#ifdef DEBUG
    return (RoundLevel)JitConfig.JitRoundFloat();
#else
    return DEFAULT_ROUND_LEVEL;
#endif
}

/*****************************************************************************/
/*****************************************************************************
 *
 *  Return the lowest bit that is set
 */

template <typename T>
inline T genFindLowestBit(T value)
{
    return (value & (0 - value));
}

/*****************************************************************************
*
*  Return true if the given value has exactly zero or one bits set.
*/

template <typename T>
inline bool genMaxOneBit(T value)
{
    return (value & (value - 1)) == 0;
}

/*****************************************************************************
*
*  Return true if the given value has exactly one bit set.
*/

template <typename T>
inline bool genExactlyOneBit(T value)
{
    return ((value != 0) && genMaxOneBit(value));
}

/*****************************************************************************
 *
 *  Given a value that has exactly one bit set, return the position of that
 *  bit, in other words return the logarithm in base 2 of the given value.
 */
inline unsigned genLog2(unsigned value)
{
    assert(genExactlyOneBit(value));
    return BitOperations::BitScanForward(value);
}

inline unsigned genLog2(unsigned __int64 value)
{
    assert(genExactlyOneBit(value));
    return BitOperations::BitScanForward(value);
}

#ifdef __APPLE__
inline unsigned genLog2(size_t value)
{
    return genLog2((unsigned __int64)value);
}
#endif // __APPLE__

// Given an unsigned 64-bit value, returns the lower 32-bits in unsigned format
//
inline unsigned ulo32(unsigned __int64 value)
{
    return static_cast<unsigned>(value);
}

// Given an unsigned 64-bit value, returns the upper 32-bits in unsigned format
//
inline unsigned uhi32(unsigned __int64 value)
{
    return static_cast<unsigned>(value >> 32);
}

/*****************************************************************************
 *
 *  A rather simple routine that counts the number of bits in a given number.
 */

inline unsigned genCountBits(uint64_t bits)
{
    return BitOperations::PopCount(bits);
}

/*****************************************************************************
 *
 *  A rather simple routine that counts the number of bits in a given number.
 */

inline unsigned genCountBits(uint32_t bits)
{
    return BitOperations::PopCount(bits);
}

/*****************************************************************************
 *
 *  Given 3 masks value, end, start, returns the bits of value between start
 *  and end (exclusive).
 *
 *  value[bitNum(end) - 1, bitNum(start) + 1]
 */

inline unsigned __int64 BitsBetween(unsigned __int64 value, unsigned __int64 end, unsigned __int64 start)
{
    assert(start != 0);
    assert(start < end);
    assert((start & (start - 1)) == 0);
    assert((end & (end - 1)) == 0);

    return value & ~((start - 1) | start) & // Ones to the left of set bit in the start mask.
           (end - 1);                       // Ones to the right of set bit in the end mask.
}

/*****************************************************************************/

inline bool jitIsScaleIndexMul(size_t val)
{
    switch (val)
    {
        case 1:
        case 2:
        case 4:
        case 8:
            return true;

        default:
            return false;
    }
}

// Returns "tree" iff "val" is a valid addressing mode scale shift amount on
// the target architecture.
inline bool jitIsScaleIndexShift(ssize_t val)
{
    // It happens that this is the right test for all our current targets: x86, x64 and ARM.
    // This test would become target-dependent if we added a new target with a different constraint.
    return 0 < val && val < 4;
}

/*****************************************************************************
 * Returns true if value is between [start..end).
 * The comparison is inclusive of start, exclusive of end.
 */

/* static */
inline bool Compiler::jitIsBetween(unsigned value, unsigned start, unsigned end)
{
    return start <= value && value < end;
}

/*****************************************************************************
 * Returns true if value is between [start..end].
 * The comparison is inclusive of both start and end.
 */

/* static */
inline bool Compiler::jitIsBetweenInclusive(unsigned value, unsigned start, unsigned end)
{
    return start <= value && value <= end;
}

#define HISTOGRAM_MAX_SIZE_COUNT 64

#if CALL_ARG_STATS || COUNT_BASIC_BLOCKS || COUNT_LOOPS || EMITTER_STATS || MEASURE_NODE_SIZE || MEASURE_MEM_ALLOC

class Dumpable
{
public:
    virtual void dump(FILE* output) = 0;
};

// Helper class to record and display a histogram of different values.
// Usage like:
// static unsigned s_buckets[] = { 1, 2, 5, 10, 0 }; // Must have terminating 0
// static Histogram s_histogram(s_buckets);
// ...
// s_histogram.record(someValue);
//
// The histogram can later be dumped with the dump function, or automatically
// be dumped on shutdown of the JIT library using the DumpOnShutdown helper
// class (see below). It will display how many recorded values fell into each
// of the buckets (<= 1, <= 2, <= 5, <= 10, > 10).
class Histogram : public Dumpable
{
public:
    Histogram(const unsigned* const sizeTable);

    void dump(FILE* output);
    void record(unsigned size);

private:
    unsigned              m_sizeCount;
    const unsigned* const m_sizeTable;
    LONG                  m_counts[HISTOGRAM_MAX_SIZE_COUNT];
};

// Helper class to record and display counts of node types. Use like:
// static NodeCounts s_nodeCounts;
// ...
// s_nodeCounts.record(someNode->gtOper);
//
// The node counts can later be dumped with the dump function, or automatically
// be dumped on shutdown of the JIT library using the DumpOnShutdown helper
// class (see below). It will display output such as:
// LCL_VAR              :   62221
// CNS_INT              :   42139
// COMMA                :     623
// CAST                 :     460
// ADD                  :     397
// RSH                  :      72
// NEG                  :       5
// UDIV                 :       1
//
class NodeCounts : public Dumpable
{
public:
    NodeCounts() : m_counts()
    {
    }

    void dump(FILE* output);
    void record(genTreeOps oper);

private:
    LONG m_counts[GT_COUNT];
};

// Helper class to register a Histogram or NodeCounts instance to automatically
// be output to jitstdout when the JIT library is shutdown. Example usage:
//
// static NodeCounts s_nodeCounts;
// static DumpOnShutdown d("Bounds check index node types", &s_nodeCounts);
// ...
// s_nodeCounts.record(...);
//
// Useful for quick ad-hoc investigations without having to manually go add
// code into Compiler::compShutdown and expose the Histogram/NodeCount to that
// function.
class DumpOnShutdown
{
public:
    DumpOnShutdown(const char* name, Dumpable* histogram);
    static void DumpAll();
};

#endif // CALL_ARG_STATS || COUNT_BASIC_BLOCKS || COUNT_LOOPS || EMITTER_STATS || MEASURE_NODE_SIZE

/******************************************************************************************
 * Return the EH descriptor for the given region index.
 */
inline EHblkDsc* Compiler::ehGetDsc(unsigned regionIndex)
{
    assert(regionIndex < compHndBBtabCount);
    return &compHndBBtab[regionIndex];
}

/******************************************************************************************
 * Return the EH descriptor index of the enclosing try, for the given region index.
 */
inline unsigned Compiler::ehGetEnclosingTryIndex(unsigned regionIndex)
{
    return ehGetDsc(regionIndex)->ebdEnclosingTryIndex;
}

/******************************************************************************************
 * Return the EH descriptor index of the enclosing handler, for the given region index.
 */
inline unsigned Compiler::ehGetEnclosingHndIndex(unsigned regionIndex)
{
    return ehGetDsc(regionIndex)->ebdEnclosingHndIndex;
}

/******************************************************************************************
 * Return the EH index given a region descriptor.
 */
inline unsigned Compiler::ehGetIndex(EHblkDsc* ehDsc)
{
    assert(compHndBBtab <= ehDsc && ehDsc < compHndBBtab + compHndBBtabCount);
    return (unsigned)(ehDsc - compHndBBtab);
}

/******************************************************************************************
 * Return the EH descriptor for the most nested 'try' region this BasicBlock is a member of
 * (or nullptr if this block is not in a 'try' region).
 */
inline EHblkDsc* Compiler::ehGetBlockTryDsc(const BasicBlock* block)
{
    if (!block->hasTryIndex())
    {
        return nullptr;
    }

    return ehGetDsc(block->getTryIndex());
}

/******************************************************************************************
 * Return the EH descriptor for the most nested filter or handler region this BasicBlock is a member of
 * (or nullptr if this block is not in a filter or handler region).
 */
inline EHblkDsc* Compiler::ehGetBlockHndDsc(const BasicBlock* block)
{
    if (!block->hasHndIndex())
    {
        return nullptr;
    }

    return ehGetDsc(block->getHndIndex());
}

#define RETURN_ON_ABORT(expr)                                                                                          \
    if (expr == BasicBlockVisit::Abort)                                                                                \
    {                                                                                                                  \
        return BasicBlockVisit::Abort;                                                                                 \
    }

//------------------------------------------------------------------------------
// VisitEHEnclosedHandlerSecondPassSuccs: Given a block, if it is a filter
// (i.e. invoked in first-pass EH), then visit all successors that control may
// flow to as part of second-pass EH.
//
// Arguments:
//   comp - Compiler instance
//   func - Callback
//
// Returns:
//   Whether or not the visiting should proceed.
//
// Remarks:
//   This function handles the semantics of first and second pass EH where the
//   EH subsystem may invoke any enclosed finally/fault right after invoking a
//   filter.
//
template <typename TFunc>
BasicBlockVisit BasicBlock::VisitEHEnclosedHandlerSecondPassSuccs(Compiler* comp, TFunc func)
{
    if (!hasHndIndex())
    {
        return BasicBlockVisit::Continue;
    }

    const unsigned thisHndIndex   = getHndIndex();
    EHblkDsc*      enclosingHBtab = comp->ehGetDsc(thisHndIndex);

    if (!enclosingHBtab->InFilterRegionBBRange(this))
    {
        return BasicBlockVisit::Continue;
    }

    assert(enclosingHBtab->HasFilter());

    // Search the EH table for enclosed regions.
    //
    // All the enclosed regions will be lower numbered and
    // immediately prior to and contiguous with the enclosing
    // region in the EH tab.
    unsigned index = thisHndIndex;

    while (index > 0)
    {
        index--;
        bool     inTry;
        unsigned enclosingIndex = comp->ehGetEnclosingRegionIndex(index, &inTry);
        bool     isEnclosed     = false;

        // To verify this is an enclosed region, search up
        // through the enclosing regions until we find the
        // region associated with the filter.
        while (enclosingIndex != EHblkDsc::NO_ENCLOSING_INDEX)
        {
            if (enclosingIndex == thisHndIndex)
            {
                isEnclosed = true;
                break;
            }

            enclosingIndex = comp->ehGetEnclosingRegionIndex(enclosingIndex, &inTry);
        }

        // If we found an enclosed region, check if the region
        // is a try fault or try finally, and if so, invoke the callback
        // for the enclosed region's handler.
        if (isEnclosed)
        {
            if (inTry)
            {
                EHblkDsc* enclosedHBtab = comp->ehGetDsc(index);

                if (enclosedHBtab->HasFinallyOrFaultHandler())
                {
                    RETURN_ON_ABORT(func(enclosedHBtab->ebdHndBeg));
                }
            }
        }
        // Once we run across a non-enclosed region, we can stop searching.
        else
        {
            break;
        }
    }

    return BasicBlockVisit::Continue;
}

//------------------------------------------------------------------------------
// VisitEHSuccs: Given a block inside a handler region, visit all handlers
// that control may flow to as part of EH.
//
// Type arguments:
//   skipJumpDest - Whether the jump destination has already been
//   yielded, in which case it should be skipped here.
//   TFunc - Functor type
//
// Arguments:
//   comp  - Compiler instance
//   block - The block
//   func  - Callback
//
// Returns:
//   Whether or not the visiting should proceed.
//
// Remarks:
//   This encapsulates the "exception handling" successors of a block. These
//   are the blocks that control may flow to as part of exception handling:
//   1. On thrown exceptions, control may flow to handlers
//   2. As part of two pass EH, control may flow from filters to enclosed handlers
//   3. As part of two pass EH, control may bypass filters and flow directly to
//   filter-handlers
//
template <bool         skipJumpDest, typename TFunc>
static BasicBlockVisit VisitEHSuccs(Compiler* comp, BasicBlock* block, TFunc func)
{
    if (!block->HasPotentialEHSuccs(comp))
    {
        return BasicBlockVisit::Continue;
    }

    EHblkDsc* eh = comp->ehGetBlockExnFlowDsc(block);
    if (eh != nullptr)
    {
        while (true)
        {
            if (eh->HasFilter())
            {
                RETURN_ON_ABORT(func(eh->ebdFilter));

                // Control may bypass the filter and flow directly into a
                // handler; this happens if this was an enclosed handler that
                // was invoked as part of two pass EH.
                RETURN_ON_ABORT(func(eh->ebdHndBeg));
            }
            else
            {
                // For BBJ_CALLFINALLY the user may already have processed one of
                // the EH successors as a regular successor; skip it if requested.
                if (!skipJumpDest || !block->TargetIs(eh->ebdHndBeg))
                {
                    RETURN_ON_ABORT(func(eh->ebdHndBeg));
                }
            }

            if (eh->ebdEnclosingTryIndex == EHblkDsc::NO_ENCLOSING_INDEX)
            {
                break;
            }

            eh = comp->ehGetDsc(eh->ebdEnclosingTryIndex);
        }
    }

    return block->VisitEHEnclosedHandlerSecondPassSuccs(comp, func);
}

//------------------------------------------------------------------------------
// VisitEHSuccs: Given a block inside a handler region, visit all handlers
// that control may flow to as part of EH.
//
// Arguments:
//   comp  - Compiler instance
//   func  - Callback
//
// Returns:
//   Whether or not the visiting should proceed.
//
// Remarks:
//   For more documentation, see ::VisitEHSuccs.
//
template <typename TFunc>
BasicBlockVisit BasicBlock::VisitEHSuccs(Compiler* comp, TFunc func)
{
    // These are "pseudo-blocks" and control never actually flows into them
    // (codegen directly jumps to its successor after finally calls).
    if (KindIs(BBJ_CALLFINALLYRET))
    {
        return BasicBlockVisit::Continue;
    }

    return ::VisitEHSuccs</* skipJumpDest */ false, TFunc>(comp, this, func);
}

//------------------------------------------------------------------------------
// VisitAllSuccs: Visit all successors (including EH successors) of this block.
//
// Arguments:
//   comp  - Compiler instance
//   func  - Callback
//
// Returns:
//   Whether or not the visiting was aborted.
//
template <typename TFunc>
BasicBlockVisit BasicBlock::VisitAllSuccs(Compiler* comp, TFunc func)
{
    switch (bbKind)
    {
        case BBJ_EHFINALLYRET:
            // This can run before import, in which case we haven't converted
            // LEAVE into callfinally yet, and haven't added return successors.
            if (bbEhfTargets != nullptr)
            {
                for (unsigned i = 0; i < bbEhfTargets->bbeCount; i++)
                {
                    RETURN_ON_ABORT(func(bbEhfTargets->bbeSuccs[i]));
                }
            }

            return VisitEHSuccs(comp, func);

        case BBJ_CALLFINALLY:
            RETURN_ON_ABORT(func(bbTarget));
            return ::VisitEHSuccs</* skipJumpDest */ true, TFunc>(comp, this, func);

        case BBJ_CALLFINALLYRET:
            // These are "pseudo-blocks" and control never actually flows into them
            // (codegen directly jumps to its successor after finally calls).
            return func(bbTarget);

        case BBJ_EHCATCHRET:
        case BBJ_EHFILTERRET:
        case BBJ_LEAVE:
        case BBJ_ALWAYS:
            RETURN_ON_ABORT(func(bbTarget));
            return VisitEHSuccs(comp, func);

        case BBJ_COND:
            RETURN_ON_ABORT(func(bbFalseTarget));

            if (bbTrueTarget != bbFalseTarget)
            {
                RETURN_ON_ABORT(func(bbTrueTarget));
            }

            return VisitEHSuccs(comp, func);

        case BBJ_SWITCH:
        {
            Compiler::SwitchUniqueSuccSet sd = comp->GetDescriptorForSwitch(this);
            for (unsigned i = 0; i < sd.numDistinctSuccs; i++)
            {
                RETURN_ON_ABORT(func(sd.nonDuplicates[i]));
            }

            return VisitEHSuccs(comp, func);
        }

        case BBJ_THROW:
        case BBJ_RETURN:
        case BBJ_EHFAULTRET:
            return VisitEHSuccs(comp, func);

        default:
            unreached();
    }
}

//------------------------------------------------------------------------------
// VisitRegularSuccs: Visit regular successors of this block.
//
// Arguments:
//   comp  - Compiler instance
//   func  - Callback
//
// Returns:
//   Whether or not the visiting was aborted.
//
template <typename TFunc>
BasicBlockVisit BasicBlock::VisitRegularSuccs(Compiler* comp, TFunc func)
{
    switch (bbKind)
    {
        case BBJ_EHFINALLYRET:
            // This can run before import, in which case we haven't converted
            // LEAVE into callfinally yet, and haven't added return successors.
            if (bbEhfTargets != nullptr)
            {
                for (unsigned i = 0; i < bbEhfTargets->bbeCount; i++)
                {
                    RETURN_ON_ABORT(func(bbEhfTargets->bbeSuccs[i]));
                }
            }

            return BasicBlockVisit::Continue;

        case BBJ_CALLFINALLY:
        case BBJ_CALLFINALLYRET:
        case BBJ_EHCATCHRET:
        case BBJ_EHFILTERRET:
        case BBJ_LEAVE:
        case BBJ_ALWAYS:
            return func(bbTarget);

        case BBJ_COND:
            RETURN_ON_ABORT(func(bbFalseTarget));

            if (bbTrueTarget != bbFalseTarget)
            {
                RETURN_ON_ABORT(func(bbTrueTarget));
            }

            return BasicBlockVisit::Continue;

        case BBJ_SWITCH:
        {
            Compiler::SwitchUniqueSuccSet sd = comp->GetDescriptorForSwitch(this);
            for (unsigned i = 0; i < sd.numDistinctSuccs; i++)
            {
                RETURN_ON_ABORT(func(sd.nonDuplicates[i]));
            }

            return BasicBlockVisit::Continue;
        }

        case BBJ_THROW:
        case BBJ_RETURN:
        case BBJ_EHFAULTRET:
            return BasicBlockVisit::Continue;

        default:
            unreached();
    }
}

#undef RETURN_ON_ABORT

//------------------------------------------------------------------------------
// HasPotentialEHSuccs: Fast check to see if this block could have successors
// that control may flow to as part of EH.
//
// Arguments:
//   comp  - Compiler instance
//
// Returns:
//   True if so.
//
inline bool BasicBlock::HasPotentialEHSuccs(Compiler* comp)
{
    if (hasTryIndex())
    {
        return true;
    }

    EHblkDsc* hndDesc = comp->ehGetBlockHndDsc(this);
    if (hndDesc == nullptr)
    {
        return false;
    }

    // Throwing in a filter is the same as returning "continue search", which
    // causes enclosed finally/fault handlers to be executed.
    return hndDesc->InFilterRegionBBRange(this);
}

#if defined(FEATURE_EH_FUNCLETS)

/*****************************************************************************
 *  Get the FuncInfoDsc for the funclet we are currently generating code for.
 *  This is only valid during codegen.
 *
 */
inline FuncInfoDsc* Compiler::funCurrentFunc()
{
    return funGetFunc(compCurrFuncIdx);
}

/*****************************************************************************
 *  Change which funclet we are currently generating code for.
 *  This is only valid after funclets are created.
 *
 */
inline void Compiler::funSetCurrentFunc(unsigned funcIdx)
{
    assert(fgFuncletsCreated);
    assert(FitsIn<unsigned short>(funcIdx));
    noway_assert(funcIdx < compFuncInfoCount);
    compCurrFuncIdx = (unsigned short)funcIdx;
}

/*****************************************************************************
 *  Get the FuncInfoDsc for the given funclet.
 *  This is only valid after funclets are created.
 *
 */
inline FuncInfoDsc* Compiler::funGetFunc(unsigned funcIdx)
{
    assert(fgFuncletsCreated);
    assert(funcIdx < compFuncInfoCount);
    return &compFuncInfos[funcIdx];
}

/*****************************************************************************
 *  Get the funcIdx for the EH funclet that begins with block.
 *  This is only valid after funclets are created.
 *  It is only valid for blocks marked with BBF_FUNCLET_BEG because
 *  otherwise we would have to do a more expensive check to determine
 *  if this should return the filter funclet or the filter handler funclet.
 *
 */
inline unsigned Compiler::funGetFuncIdx(BasicBlock* block)
{
    assert(fgFuncletsCreated);
    assert(block->HasFlag(BBF_FUNCLET_BEG));

    EHblkDsc*    eh      = ehGetDsc(block->getHndIndex());
    unsigned int funcIdx = eh->ebdFuncIndex;
    if (eh->ebdHndBeg != block)
    {
        // If this is a filter EH clause, but we want the funclet
        // for the filter (not the filter handler), it is the previous one
        noway_assert(eh->HasFilter());
        noway_assert(eh->ebdFilter == block);
        assert(funGetFunc(funcIdx)->funKind == FUNC_HANDLER);
        assert(funGetFunc(funcIdx)->funEHIndex == funGetFunc(funcIdx - 1)->funEHIndex);
        assert(funGetFunc(funcIdx - 1)->funKind == FUNC_FILTER);
        funcIdx--;
    }

    return funcIdx;
}

#else // !FEATURE_EH_FUNCLETS

/*****************************************************************************
 *  Get the FuncInfoDsc for the funclet we are currently generating code for.
 *  This is only valid during codegen.  For non-funclet platforms, this is
 *  always the root function.
 *
 */
inline FuncInfoDsc* Compiler::funCurrentFunc()
{
    return &compFuncInfoRoot;
}

/*****************************************************************************
 *  Change which funclet we are currently generating code for.
 *  This is only valid after funclets are created.
 *
 */
inline void Compiler::funSetCurrentFunc(unsigned funcIdx)
{
    assert(funcIdx == 0);
}

/*****************************************************************************
 *  Get the FuncInfoDsc for the givven funclet.
 *  This is only valid after funclets are created.
 *
 */
inline FuncInfoDsc* Compiler::funGetFunc(unsigned funcIdx)
{
    assert(funcIdx == 0);
    return &compFuncInfoRoot;
}

/*****************************************************************************
 *  No funclets, so always 0.
 *
 */
inline unsigned Compiler::funGetFuncIdx(BasicBlock* block)
{
    return 0;
}

#endif // !FEATURE_EH_FUNCLETS

//------------------------------------------------------------------------------
// genRegNumFromMask : Maps a single register mask to a register number.
//
// Arguments:
//    mask - the register mask
//
// Return Value:
//    The number of the register contained in the mask.
//
// Assumptions:
//    The mask contains one and only one register.

inline regNumber genRegNumFromMask(regMaskTP mask)
{
    assert(mask != 0); // Must have one bit set, so can't have a mask of zero

    /* Convert the mask to a register number */

    regNumber regNum = (regNumber)genLog2(mask);

    /* Make sure we got it right */

    assert(genRegMask(regNum) == mask);

    return regNum;
}

//------------------------------------------------------------------------------
// genFirstRegNumFromMaskAndToggle : Maps first bit set in the register mask to a
//          register number and also toggle the bit in the `mask`.
// Arguments:
//    mask               - the register mask
//
// Return Value:
//    The number of the first register contained in the mask and updates the `mask` to toggle
//    the bit.
//

inline regNumber genFirstRegNumFromMaskAndToggle(regMaskTP& mask)
{
    assert(mask != 0); // Must have one bit set, so can't have a mask of zero

    /* Convert the mask to a register number */

    regNumber regNum = (regNumber)BitOperations::BitScanForward(mask);
    mask ^= genRegMask(regNum);

    return regNum;
}

//------------------------------------------------------------------------------
// genFirstRegNumFromMask : Maps first bit set in the register mask to a register number.
//
// Arguments:
//    mask               - the register mask
//
// Return Value:
//    The number of the first register contained in the mask.
//

inline regNumber genFirstRegNumFromMask(regMaskTP mask)
{
    assert(mask != 0); // Must have one bit set, so can't have a mask of zero

    /* Convert the mask to a register number */

    regNumber regNum = (regNumber)BitOperations::BitScanForward(mask);

    return regNum;
}

/*****************************************************************************
 *
 *  Return the size in bytes of the given type.
 */

extern const BYTE genTypeSizes[TYP_COUNT];

template <class T>
inline unsigned genTypeSize(T value)
{
    assert((unsigned)TypeGet(value) < ArrLen(genTypeSizes));

    return genTypeSizes[TypeGet(value)];
}

/*****************************************************************************
 *
 *  Return the "stack slot count" of the given type.
 *      returns 1 for 32-bit types and 2 for 64-bit types.
 */

extern const BYTE genTypeStSzs[TYP_COUNT];

template <class T>
inline unsigned genTypeStSz(T value)
{
    assert((unsigned)TypeGet(value) < ArrLen(genTypeStSzs));

    return genTypeStSzs[TypeGet(value)];
}

/*****************************************************************************
 *
 *  Return the number of registers required to hold a value of the given type.
 */

/*****************************************************************************
 *
 *  The following function maps a 'precise' type to an actual type as seen
 *  by the VM (for example, 'byte' maps to 'int').
 */

extern const BYTE genActualTypes[TYP_COUNT];

template <class T>
inline var_types genActualType(T value)
{
    /* Spot check to make certain the table is in synch with the enum */
    assert(genActualTypes[TYP_DOUBLE] == TYP_DOUBLE);
    assert(genActualTypes[TYP_REF] == TYP_REF);

    assert((unsigned)TypeGet(value) < sizeof(genActualTypes));

    return (var_types)genActualTypes[TypeGet(value)];
}

/*****************************************************************************
 *  Can this type be passed as a parameter in a register?
 */

inline bool isRegParamType(var_types type)
{
#if defined(TARGET_X86)
    return (type <= TYP_INT || type == TYP_REF || type == TYP_BYREF);
#else  // !TARGET_X86
    return true;
#endif // !TARGET_X86
}

#if defined(TARGET_AMD64) || defined(TARGET_ARMARCH) || defined(TARGET_LOONGARCH64) || defined(TARGET_RISCV64)
/*****************************************************************************/
// Returns true if 'type' is a struct that can be enregistered for call args
//                         or can be returned by value in multiple registers.
//              if 'type' is not a struct the return value will be false.
//
// Arguments:
//    type      - the basic jit var_type for the item being queried
//    typeClass - the handle for the struct when 'type' is TYP_STRUCT
//    typeSize  - Out param (if non-null) is updated with the size of 'type'.
//    forReturn - this is true when we asking about a GT_RETURN context;
//                this is false when we are asking about an argument context
//    isVarArg  - whether or not this is a vararg fixed arg or variable argument
//              - if so on arm64 windows getArgTypeForStruct will ignore HFA
//              - types
//    callConv  - the calling convention of the call
//
inline bool Compiler::VarTypeIsMultiByteAndCanEnreg(var_types                type,
                                                    CORINFO_CLASS_HANDLE     typeClass,
                                                    unsigned*                typeSize,
                                                    bool                     forReturn,
                                                    bool                     isVarArg,
                                                    CorInfoCallConvExtension callConv)
{
    bool     result = false;
    unsigned size   = 0;

    if (varTypeIsStruct(type))
    {
        assert(typeClass != nullptr);
        size = info.compCompHnd->getClassSize(typeClass);
        if (forReturn)
        {
            structPassingKind howToReturnStruct;
            type = getReturnTypeForStruct(typeClass, callConv, &howToReturnStruct, size);
        }
        else
        {
            structPassingKind howToPassStruct;
            type = getArgTypeForStruct(typeClass, &howToPassStruct, isVarArg, size);
        }
        if (type != TYP_UNKNOWN)
        {
            result = true;
        }
    }
    else
    {
        size = genTypeSize(type);
    }

    if (typeSize != nullptr)
    {
        *typeSize = size;
    }

    return result;
}
#endif // TARGET_AMD64 || TARGET_ARMARCH || TARGET_LOONGARCH64 || TARGET_RISCV64

/*****************************************************************************/

#ifdef DEBUG

inline const char* varTypeGCstring(var_types type)
{
    switch (type)
    {
        case TYP_REF:
            return "gcr";
        case TYP_BYREF:
            return "byr";
        default:
            return "non";
    }
}

#endif

/*****************************************************************************/

const char* varTypeName(var_types);

/*****************************************************************************/
//  Helpers to pull little-endian values out of a byte stream.

inline unsigned __int8 getU1LittleEndian(const BYTE* ptr)
{
    return *(UNALIGNED unsigned __int8*)ptr;
}

inline unsigned __int16 getU2LittleEndian(const BYTE* ptr)
{
    return GET_UNALIGNED_VAL16(ptr);
}

inline unsigned __int32 getU4LittleEndian(const BYTE* ptr)
{
    return GET_UNALIGNED_VAL32(ptr);
}

inline signed __int8 getI1LittleEndian(const BYTE* ptr)
{
    return *(UNALIGNED signed __int8*)ptr;
}

inline signed __int16 getI2LittleEndian(const BYTE* ptr)
{
    return GET_UNALIGNED_VAL16(ptr);
}

inline signed __int32 getI4LittleEndian(const BYTE* ptr)
{
    return GET_UNALIGNED_VAL32(ptr);
}

inline signed __int64 getI8LittleEndian(const BYTE* ptr)
{
    return GET_UNALIGNED_VAL64(ptr);
}

inline float getR4LittleEndian(const BYTE* ptr)
{
    __int32 val = getI4LittleEndian(ptr);
    return *(float*)&val;
}

inline double getR8LittleEndian(const BYTE* ptr)
{
    __int64 val = getI8LittleEndian(ptr);
    return *(double*)&val;
}

#ifdef DEBUG
const char* genES2str(BitVecTraits* traits, EXPSET_TP set);
const char* refCntWtd2str(weight_t refCntWtd, bool padForDecimalPlaces = false);
#endif

/*
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XX                          GenTree                                          XX
XX                      Inline functions                                     XX
XX                                                                           XX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
*/

void* GenTree::operator new(size_t sz, Compiler* comp, genTreeOps oper)
{
    size_t size = GenTree::s_gtNodeSizes[oper];

#if MEASURE_NODE_SIZE
    genNodeSizeStats.genTreeNodeCnt += 1;
    genNodeSizeStats.genTreeNodeSize += size;
    genNodeSizeStats.genTreeNodeActualSize += sz;

    genNodeSizeStatsPerFunc.genTreeNodeCnt += 1;
    genNodeSizeStatsPerFunc.genTreeNodeSize += size;
    genNodeSizeStatsPerFunc.genTreeNodeActualSize += sz;
#endif // MEASURE_NODE_SIZE

    assert(size >= sz);
    return comp->getAllocator(CMK_ASTNode).allocate<char>(size);
}

// GenTree constructor
inline GenTree::GenTree(genTreeOps oper, var_types type DEBUGARG(bool largeNode))
{
    gtOper     = oper;
    gtType     = type;
    gtFlags    = GTF_EMPTY;
    gtLIRFlags = 0;
#ifdef DEBUG
    gtDebugFlags = GTF_DEBUG_NONE;
#endif // DEBUG
    gtCSEnum = NO_CSE;
    ClearAssertion();

    gtNext = nullptr;
    gtPrev = nullptr;
    SetRegNum(REG_NA);
    INDEBUG(gtRegTag = GT_REGTAG_NONE;)

    INDEBUG(gtCostsInitialized = false;)

#ifdef DEBUG
    size_t size = GenTree::s_gtNodeSizes[oper];
    if (size == TREE_NODE_SZ_SMALL && !largeNode)
    {
        gtDebugFlags |= GTF_DEBUG_NODE_SMALL;
    }
    else if (size == TREE_NODE_SZ_LARGE || largeNode)
    {
        gtDebugFlags |= GTF_DEBUG_NODE_LARGE;
    }
    else
    {
        assert(!"bogus node size");
    }
#endif

#if COUNT_AST_OPERS
    InterlockedIncrement(&s_gtNodeCounts[oper]);
#endif

#ifdef DEBUG
    gtSeqNum = 0;
    gtUseNum = -1;
    gtTreeID = JitTls::GetCompiler()->compGenTreeID++;
    gtVNPair.SetBoth(ValueNumStore::NoVN);
    gtRegTag   = GT_REGTAG_NONE;
    gtOperSave = GT_NONE;
#endif
}

/*****************************************************************************/

inline Statement* Compiler::gtNewStmt(GenTree* expr)
{
    Statement* stmt = new (this->getAllocator(CMK_ASTNode)) Statement(expr DEBUGARG(compStatementID++));
    return stmt;
}

inline Statement* Compiler::gtNewStmt(GenTree* expr, const DebugInfo& di)
{
    Statement* stmt = gtNewStmt(expr);
    stmt->SetDebugInfo(di);
    return stmt;
}

inline GenTree* Compiler::gtNewOperNode(genTreeOps oper, var_types type, GenTree* op1)
{
    assert((GenTree::OperKind(oper) & (GTK_UNOP | GTK_BINOP)) != 0);
    assert((GenTree::OperKind(oper) & GTK_EXOP) ==
           0); // Can't use this to construct any types that extend unary/binary operator.
    assert(op1 != nullptr || oper == GT_RETFILT || (oper == GT_RETURN && type == TYP_VOID));

    GenTree* node = new (this, oper) GenTreeOp(oper, type, op1, nullptr);

    return node;
}

// Returns an opcode that is of the largest node size in use.
inline genTreeOps LargeOpOpcode()
{
    assert(GenTree::s_gtNodeSizes[GT_CALL] == TREE_NODE_SZ_LARGE);
    return GT_CALL;
}

/******************************************************************************
 *
 * Use to create nodes which may later be morphed to another (big) operator
 */

inline GenTree* Compiler::gtNewLargeOperNode(genTreeOps oper, var_types type, GenTree* op1, GenTree* op2)
{
    assert((GenTree::OperKind(oper) & (GTK_UNOP | GTK_BINOP)) != 0);
    // Can't use this to construct any types that extend unary/binary operator.
    assert((GenTree::OperKind(oper) & GTK_EXOP) == 0);
    assert(GenTree::s_gtNodeSizes[oper] == TREE_NODE_SZ_SMALL);
    // Allocate a large node
    GenTree* node = new (this, LargeOpOpcode()) GenTreeOp(oper, type, op1, op2 DEBUGARG(/*largeNode*/ true));
    return node;
}

/*****************************************************************************
 *
 *  allocates a integer constant entry that represents a handle (something
 *  that may need to be fixed up).
 */

inline GenTreeIntCon* Compiler::gtNewIconHandleNode(size_t value, GenTreeFlags flags, FieldSeq* fields)
{
    assert((flags & GTF_ICON_HDL_MASK) != 0);

    GenTreeIntCon* node;
#if defined(LATE_DISASM)
    node = new (this, LargeOpOpcode()) GenTreeIntCon(TYP_I_IMPL, value, fields DEBUGARG(/*largeNode*/ true));
#else
    node             = new (this, GT_CNS_INT) GenTreeIntCon(TYP_I_IMPL, value, fields);
#endif
    node->gtFlags |= flags;
    return node;
}

/*****************************************************************************
 *
 *  It may not be allowed to embed HANDLEs directly into the JITed code (for eg,
 *  as arguments to JIT helpers). Get a corresponding value that can be embedded.
 *  These are versions for each specific type of HANDLE
 */

inline GenTree* Compiler::gtNewIconEmbScpHndNode(CORINFO_MODULE_HANDLE scpHnd)
{
    void *embedScpHnd, *pEmbedScpHnd;

    embedScpHnd = (void*)info.compCompHnd->embedModuleHandle(scpHnd, &pEmbedScpHnd);

    assert((!embedScpHnd) != (!pEmbedScpHnd));

    return gtNewIconEmbHndNode(embedScpHnd, pEmbedScpHnd, GTF_ICON_SCOPE_HDL, scpHnd);
}

//-----------------------------------------------------------------------------

inline GenTree* Compiler::gtNewIconEmbClsHndNode(CORINFO_CLASS_HANDLE clsHnd)
{
    void *embedClsHnd, *pEmbedClsHnd;

    embedClsHnd = (void*)info.compCompHnd->embedClassHandle(clsHnd, &pEmbedClsHnd);

    assert((!embedClsHnd) != (!pEmbedClsHnd));

    return gtNewIconEmbHndNode(embedClsHnd, pEmbedClsHnd, GTF_ICON_CLASS_HDL, clsHnd);
}

//-----------------------------------------------------------------------------

inline GenTree* Compiler::gtNewIconEmbMethHndNode(CORINFO_METHOD_HANDLE methHnd)
{
    void *embedMethHnd, *pEmbedMethHnd;

    embedMethHnd = (void*)info.compCompHnd->embedMethodHandle(methHnd, &pEmbedMethHnd);

    assert((!embedMethHnd) != (!pEmbedMethHnd));

    return gtNewIconEmbHndNode(embedMethHnd, pEmbedMethHnd, GTF_ICON_METHOD_HDL, methHnd);
}

//-----------------------------------------------------------------------------

inline GenTree* Compiler::gtNewIconEmbFldHndNode(CORINFO_FIELD_HANDLE fldHnd)
{
    void *embedFldHnd, *pEmbedFldHnd;

    embedFldHnd = (void*)info.compCompHnd->embedFieldHandle(fldHnd, &pEmbedFldHnd);

    assert((!embedFldHnd) != (!pEmbedFldHnd));

    return gtNewIconEmbHndNode(embedFldHnd, pEmbedFldHnd, GTF_ICON_FIELD_HDL, fldHnd);
}

/*****************************************************************************/

//------------------------------------------------------------------------------
// gtNewHelperCallNode : Helper to create a call helper node.
//
//
// Arguments:
//    helper    - Call helper
//    type      - Type of the node
//    args      - Call args (struct args not supported)
//
// Return Value:
//    New CT_HELPER node
//
inline GenTreeCall* Compiler::gtNewHelperCallNode(
    unsigned helper, var_types type, GenTree* arg1, GenTree* arg2, GenTree* arg3)
{
    GenTreeFlags flags  = s_helperCallProperties.NoThrow((CorInfoHelpFunc)helper) ? GTF_EMPTY : GTF_EXCEPT;
    GenTreeCall* result = gtNewCallNode(CT_HELPER, eeFindHelper(helper), type);
    result->gtFlags |= flags;

#if DEBUG
    // Helper calls are never candidates.

    result->gtInlineObservation = InlineObservation::CALLSITE_IS_CALL_TO_HELPER;
#endif

    if (arg3 != nullptr)
    {
        result->gtArgs.PushFront(this, NewCallArg::Primitive(arg3));
        result->gtFlags |= arg3->gtFlags & GTF_ALL_EFFECT;
    }

    if (arg2 != nullptr)
    {
        result->gtArgs.PushFront(this, NewCallArg::Primitive(arg2));
        result->gtFlags |= arg2->gtFlags & GTF_ALL_EFFECT;
    }

    if (arg1 != nullptr)
    {
        result->gtArgs.PushFront(this, NewCallArg::Primitive(arg1));
        result->gtFlags |= arg1->gtFlags & GTF_ALL_EFFECT;
    }

    return result;
}

//------------------------------------------------------------------------
// gtNewAllocObjNode: A little helper to create an object allocation node.
//
// Arguments:
//    helper               - Value returned by ICorJitInfo::getNewHelper
//    helperHasSideEffects - True iff allocation helper has side effects
//    clsHnd               - Corresponding class handle
//    type                 - Tree return type (e.g. TYP_REF)
//    op1                  - Node containing an address of VtablePtr
//
// Return Value:
//    Returns GT_ALLOCOBJ node that will be later morphed into an
//    allocation helper call or local variable allocation on the stack.

inline GenTreeAllocObj* Compiler::gtNewAllocObjNode(
    unsigned int helper, bool helperHasSideEffects, CORINFO_CLASS_HANDLE clsHnd, var_types type, GenTree* op1)
{
    GenTreeAllocObj* node = new (this, GT_ALLOCOBJ) GenTreeAllocObj(type, helper, helperHasSideEffects, clsHnd, op1);
    return node;
}

//------------------------------------------------------------------------
// gtNewRuntimeLookup: Helper to create a runtime lookup node
//
// Arguments:
//    hnd - generic handle being looked up
//    hndTyp - type of the generic handle
//    tree - tree for the lookup
//
// Return Value:
//    New GenTreeRuntimeLookup node.

inline GenTree* Compiler::gtNewRuntimeLookup(CORINFO_GENERIC_HANDLE hnd, CorInfoGenericHandleType hndTyp, GenTree* tree)
{
    assert(tree != nullptr);
    GenTree* node = new (this, GT_RUNTIMELOOKUP) GenTreeRuntimeLookup(hnd, hndTyp, tree);
    return node;
}

inline GenTreeIndexAddr* Compiler::gtNewIndexAddr(GenTree*             arrayOp,
                                                  GenTree*             indexOp,
                                                  var_types            elemType,
                                                  CORINFO_CLASS_HANDLE elemClassHandle,
                                                  unsigned             firstElemOffset,
                                                  unsigned             lengthOffset)
{
    unsigned elemSize =
        (elemType == TYP_STRUCT) ? info.compCompHnd->getClassSize(elemClassHandle) : genTypeSize(elemType);

#ifdef DEBUG
    bool boundsCheck = JitConfig.JitSkipArrayBoundCheck() != 1;
#else
    bool boundsCheck = true;
#endif

    GenTreeIndexAddr* indexAddr =
        new (this, GT_INDEX_ADDR) GenTreeIndexAddr(arrayOp, indexOp, elemType, elemClassHandle, elemSize, lengthOffset,
                                                   firstElemOffset, boundsCheck);

    return indexAddr;
}

inline GenTreeIndexAddr* Compiler::gtNewArrayIndexAddr(GenTree*             arrayOp,
                                                       GenTree*             indexOp,
                                                       var_types            elemType,
                                                       CORINFO_CLASS_HANDLE elemClassHandle)
{
    unsigned lengthOffset    = OFFSETOF__CORINFO_Array__length;
    unsigned firstElemOffset = OFFSETOF__CORINFO_Array__data;

    return gtNewIndexAddr(arrayOp, indexOp, elemType, elemClassHandle, firstElemOffset, lengthOffset);
}

inline GenTreeIndir* Compiler::gtNewIndexIndir(GenTreeIndexAddr* indexAddr)
{
    GenTreeIndir* index;
    if (indexAddr->gtElemType == TYP_STRUCT)
    {
        index = gtNewBlkIndir(typGetObjLayout(indexAddr->gtStructElemClass), indexAddr);
    }
    else
    {
        index = gtNewIndir(indexAddr->gtElemType, indexAddr);
    }

    return index;
}

//------------------------------------------------------------------------------
// gtAnnotateNewArrLen : Helper to add flags for new array length nodes.
//
// Arguments:
//    arrLen    - The new GT_ARR_LENGTH or GT_MDARR_LENGTH node
//    block     - Basic block that will contain the new length node
//
inline void Compiler::gtAnnotateNewArrLen(GenTree* arrLen, BasicBlock* block)
{
    assert(arrLen->OperIs(GT_ARR_LENGTH, GT_MDARR_LENGTH));
    static_assert_no_msg(GTF_ARRLEN_NONFAULTING == GTF_IND_NONFAULTING);
    static_assert_no_msg(GTF_MDARRLEN_NONFAULTING == GTF_IND_NONFAULTING);
    arrLen->SetIndirExceptionFlags(this);
}

//------------------------------------------------------------------------------
// gtNewArrLen : Helper to create an array length node.
//
// Arguments:
//    typ       - Type of the node
//    arrayOp   - Array node
//    lenOffset - Offset of the length field
//    block     - Basic block that will contain the result
//
// Return Value:
//    New GT_ARR_LENGTH node
//
inline GenTreeArrLen* Compiler::gtNewArrLen(var_types typ, GenTree* arrayOp, int lenOffset, BasicBlock* block)
{
    GenTreeArrLen* arrLen = new (this, GT_ARR_LENGTH) GenTreeArrLen(typ, arrayOp, lenOffset);
    gtAnnotateNewArrLen(arrLen, block);
    if (block != nullptr)
    {
        block->SetFlags(BBF_HAS_IDX_LEN);
    }
    optMethodFlags |= OMF_HAS_ARRAYREF;
    return arrLen;
}

//------------------------------------------------------------------------------
// gtNewMDArrLen : Helper to create an MD array length node.
//
// Arguments:
//    arrayOp   - Array node
//    dim       - MD array dimension of interest
//    rank      - MD array rank
//    block     - Basic block that will contain the result
//
// Return Value:
//    New GT_MDARR_LENGTH node
//
inline GenTreeMDArr* Compiler::gtNewMDArrLen(GenTree* arrayOp, unsigned dim, unsigned rank, BasicBlock* block)
{
    GenTreeMDArr* arrLen = new (this, GT_MDARR_LENGTH) GenTreeMDArr(GT_MDARR_LENGTH, arrayOp, dim, rank);
    gtAnnotateNewArrLen(arrLen, block);
    if (block != nullptr)
    {
        block->SetFlags(BBF_HAS_MD_IDX_LEN);
    }
    assert((optMethodFlags & OMF_HAS_MDARRAYREF) != 0); // Should have been set in the importer.
    return arrLen;
}

//------------------------------------------------------------------------------
// gtNewMDArrLowerBound : Helper to create an MD array lower bound node.
//
// Arguments:
//    arrayOp   - Array node
//    dim       - MD array dimension of interest
//    rank      - MD array rank
//    block     - Basic block that will contain the result
//
// Return Value:
//    New GT_MDARR_LOWER_BOUND node
//
inline GenTreeMDArr* Compiler::gtNewMDArrLowerBound(GenTree* arrayOp, unsigned dim, unsigned rank, BasicBlock* block)
{
    GenTreeMDArr* arrOp = new (this, GT_MDARR_LOWER_BOUND) GenTreeMDArr(GT_MDARR_LOWER_BOUND, arrayOp, dim, rank);

    static_assert_no_msg(GTF_MDARRLOWERBOUND_NONFAULTING == GTF_IND_NONFAULTING);
    arrOp->SetIndirExceptionFlags(this);
    if (block != nullptr)
    {
        block->SetFlags(BBF_HAS_MD_IDX_LEN);
    }
    assert((optMethodFlags & OMF_HAS_MDARRAYREF) != 0); // Should have been set in the importer.
    return arrOp;
}

//------------------------------------------------------------------------------
// gtNewNullCheck : Helper to create a null check node.
//
// Arguments:
//    addr        -  Address to null check
//    basicBlock  -  Basic block of the node
//
// Return Value:
//    New GT_NULLCHECK node

inline GenTree* Compiler::gtNewNullCheck(GenTree* addr, BasicBlock* basicBlock)
{
    assert(fgAddrCouldBeNull(addr));
    GenTree* nullCheck = gtNewOperNode(GT_NULLCHECK, TYP_BYTE, addr);
    nullCheck->gtFlags |= GTF_EXCEPT;
    basicBlock->SetFlags(BBF_HAS_NULLCHECK);
    optMethodFlags |= OMF_HAS_NULLCHECK;
    return nullCheck;
}

/*****************************************************************************
 *
 *  Create (and check for) a "nothing" node, i.e. a node that doesn't produce
 *  any code. We currently use a "nop" node of type void for this purpose.
 */

inline GenTree* Compiler::gtNewNothingNode()
{
    return new (this, GT_NOP) GenTree(GT_NOP, TYP_VOID);
}
/*****************************************************************************/

inline bool GenTree::IsNothingNode() const
{
    return (gtOper == GT_NOP && gtType == TYP_VOID);
}

/*****************************************************************************
 *
 *  Change the given node to a NOP - May be later changed to a GT_COMMA
 *
 *****************************************************************************/

inline void GenTree::gtBashToNOP()
{
    ChangeOper(GT_NOP);
    gtType = TYP_VOID;
    gtFlags &= ~(GTF_ALL_EFFECT | GTF_REVERSE_OPS);
}

inline GenTree* Compiler::gtUnusedValNode(GenTree* expr)
{
    return gtNewOperNode(GT_COMMA, TYP_VOID, expr, gtNewNothingNode());
}

/*****************************************************************************
 *
 * A wrapper for gtSetEvalOrder and gtComputeFPlvls
 * Necessary because the FP levels may need to be re-computed if we reverse
 * operands
 */

inline void Compiler::gtSetStmtInfo(Statement* stmt)
{
    GenTree* expr = stmt->GetRootNode();

    /* Recursively process the expression */

    gtSetEvalOrder(expr);
}

/*****************************************************************************/

inline void Compiler::fgUpdateConstTreeValueNumber(GenTree* tree)
{
    if (vnStore != nullptr)
    {
        fgValueNumberTreeConst(tree);
    }
}

inline GenTree* Compiler::gtNewKeepAliveNode(GenTree* op)
{
    GenTree* keepalive = gtNewOperNode(GT_KEEPALIVE, TYP_VOID, op);

    // Prevent both reordering and removal. Invalid optimizations of GC.KeepAlive are
    // very subtle and hard to observe. Thus we are conservatively marking it with both
    // GTF_CALL and GTF_GLOB_REF side-effects even though it may be more than strictly
    // necessary. The conservative side-effects are unlikely to have negative impact
    // on code quality in this case.
    keepalive->gtFlags |= (GTF_CALL | GTF_GLOB_REF);

    return keepalive;
}

inline GenTreeCast* Compiler::gtNewCastNode(var_types typ, GenTree* op1, bool fromUnsigned, var_types castType)
{
    GenTreeCast* cast = new (this, GT_CAST) GenTreeCast(typ, op1, fromUnsigned, castType);

    return cast;
}

inline GenTreeCast* Compiler::gtNewCastNodeL(var_types typ, GenTree* op1, bool fromUnsigned, var_types castType)
{
    /* Some casts get transformed into 'GT_CALL' or 'GT_IND' nodes */

    assert(GenTree::s_gtNodeSizes[GT_CALL] >= GenTree::s_gtNodeSizes[GT_CAST]);
    assert(GenTree::s_gtNodeSizes[GT_CALL] >= GenTree::s_gtNodeSizes[GT_IND]);

    /* Make a big node first and then change it to be GT_CAST */

    GenTreeCast* cast =
        new (this, LargeOpOpcode()) GenTreeCast(typ, op1, fromUnsigned, castType DEBUGARG(/*largeNode*/ true));

    return cast;
}

inline GenTreeIndir* Compiler::gtNewMethodTableLookup(GenTree* object)
{
    assert(object->TypeIs(TYP_REF));
    GenTreeIndir* result = gtNewIndir(TYP_I_IMPL, object, GTF_IND_INVARIANT);
    return result;
}

inline void GenTree::SetOperRaw(genTreeOps oper)
{
    // Please do not do anything here other than assign to gtOper (debug-only
    // code is OK, but should be kept to a minimum).
    RecordOperBashing(OperGet(), oper); // nop unless NODEBASH_STATS is enabled

    // Bashing to MultiOp nodes is currently not supported.
    assert(!OperIsMultiOp(oper));

    gtOper = oper;
}

//------------------------------------------------------------------------
// SetOper: Bash this tree to an oper within its "class".
//
// "Bashing" refers to the act of mutating a node in-place to represent
// a different oper. It is effectively a custom version of the placement
// new operator. This method encapsulates the common logic for bashing
// nodes and is intended to be used when the new oper has the same "class"
// as that being bashed from. "Class" here is used somewhat loosely, but
// in general is tied to the GenTree subtype the new oper uses and what
// "namespace" of GenTreeFlags it belongs to - this method does not clear
// them. For example, GT_LCL_VAR and GT_LCL_FLD share the same "class", as
// do GT_IND and GT_BLK, etc.
//
// This method initializes some fields on a limited number of common tree
// subtypes, however, in general, it is the caller's responsibility to make
// sure the new node ends up in a valid state.
//
// Arguments:
//    oper     - The new oper
//    vnUpdate - Whether to clear or preserve the VN (default: clear)
//
inline void GenTree::SetOper(genTreeOps oper, ValueNumberUpdate vnUpdate)
{
    assert(((gtDebugFlags & GTF_DEBUG_NODE_SMALL) != 0) != ((gtDebugFlags & GTF_DEBUG_NODE_LARGE) != 0));

    /* Make sure the node isn't too small for the new operator */

    assert(GenTree::s_gtNodeSizes[gtOper] == TREE_NODE_SZ_SMALL ||
           GenTree::s_gtNodeSizes[gtOper] == TREE_NODE_SZ_LARGE);

    assert(GenTree::s_gtNodeSizes[oper] == TREE_NODE_SZ_SMALL || GenTree::s_gtNodeSizes[oper] == TREE_NODE_SZ_LARGE);
    assert(GenTree::s_gtNodeSizes[oper] == TREE_NODE_SZ_SMALL || (gtDebugFlags & GTF_DEBUG_NODE_LARGE));

#if defined(HOST_64BIT) && !defined(TARGET_64BIT)
    if (gtOper == GT_CNS_LNG && oper == GT_CNS_INT)
    {
        // When casting from LONG to INT, we need to force cast of the value,
        // if the host architecture represents INT and LONG with the same data size.
        AsLngCon()->gtLconVal = (INT64)(INT32)AsLngCon()->gtLconVal;
    }
#endif // defined(HOST_64BIT) && !defined(TARGET_64BIT)

    SetOperRaw(oper);

#ifdef DEBUG
    // Maintain the invariant that unary operators always have NULL gtOp2.
    // If we ever start explicitly allocating GenTreeUnOp nodes, we wouldn't be
    // able to do that (but if we did, we'd have to have a check in GetOp() -- perhaps
    // a gtUnOp...)
    if (OperKind(oper) == GTK_UNOP)
    {
        AsOp()->gtOp2 = nullptr;
    }
#endif // DEBUG

#if DEBUGGABLE_GENTREE
    // Until we eliminate SetOper/ChangeOper, we also change the vtable of the node, so that
    // it shows up correctly in the debugger.
    SetVtableForOper(oper);
#endif // DEBUGGABLE_GENTREE

    if (vnUpdate == CLEAR_VN)
    {
        // Clear the ValueNum field as well.
        gtVNPair.SetBoth(ValueNumStore::NoVN);
    }

    // Do some "oper"-specific initializations. These are not intended to be exhaustive but
    // rather simplify calling code for common patterns.
    switch (oper)
    {
        case GT_CNS_INT:
            AsIntCon()->gtFieldSeq = nullptr;
            INDEBUG(AsIntCon()->gtTargetHandle = 0);
            break;
#if defined(TARGET_ARM)
        case GT_MUL_LONG:
            // We sometimes bash GT_MUL to GT_MUL_LONG, which converts it from GenTreeOp to GenTreeMultiRegOp.
            AsMultiRegOp()->gtOtherReg = REG_NA;
            AsMultiRegOp()->ClearOtherRegFlags();
            break;
#endif
        case GT_LCL_FLD:
        case GT_STORE_LCL_FLD:
            AsLclFld()->SetLclOffs(0);
            AsLclFld()->SetLayout(nullptr);
            break;

        case GT_LCL_ADDR:
            AsLclFld()->SetLayout(nullptr);
            break;

        case GT_CALL:
            new (&AsCall()->gtArgs, jitstd::placement_t()) CallArgs();
            break;
#ifdef DEBUG
        case GT_LCL_VAR:
        case GT_STORE_LCL_VAR:
            AsLclVar()->ResetLclILoffs();
            break;
#endif
        default:
            break;
    }
}

//------------------------------------------------------------------------
// ChangeOper: Bash this tree to an oper from a foreign "class".
//
// This bashing method, unlike "SetOper", clears oper-specific flags and
// so is more suitable to bashing nodes between different "classes".
//
// Arguments:
//    oper     - The new oper
//    vnUpdate - Whether to clear or preserve the VN (default: clear)
//
inline void GenTree::ChangeOper(genTreeOps oper, ValueNumberUpdate vnUpdate)
{
    assert(!OperIsConst(oper)); // use BashToConst() instead

    GenTreeFlags mask = GTF_COMMON_MASK;
    if (this->OperIsIndirOrArrMetaData() && OperIsIndirOrArrMetaData(oper))
    {
        mask |= GTF_IND_NONFAULTING;
    }
    SetOper(oper, vnUpdate);
    gtFlags &= mask;
}

//------------------------------------------------------------------------
// BashToConst: Bash the node to a constant one.
//
// The function will infer the node's new oper from the type: GT_CNS_INT
// or GT_CNS_LNG for integers and GC types, GT_CNS_DBL for floats/doubles.
//
// The type is inferred from "value"'s type ("T") unless an explicit
// one is provided via the second argument, in which case it is checked
// for compatibility with "value". So, e. g., "BashToConst(0)" will bash
// to GT_CNS_INT, type TYP_INT, "BashToConst(0, TYP_REF)" will bash to the
// canonical "null" node, but "BashToConst(0.0, TYP_INT)" will assert.
//
// Arguments:
//    value - Value which the bashed constant will have
//    type  - Type the bashed node will have
//
template <typename T>
void GenTree::BashToConst(T value, var_types type /* = TYP_UNDEF */)
{
    static_assert_no_msg((std::is_same<T, int32_t>::value || std::is_same<T, int64_t>::value ||
                          std::is_same<T, long long>::value || std::is_same<T, float>::value ||
                          std::is_same<T, ssize_t>::value || std::is_same<T, double>::value));

    static_assert_no_msg(sizeof(int64_t) == sizeof(long long));

    var_types typeOfValue = TYP_UNDEF;
    if (std::is_floating_point<T>::value)
    {
        assert((type == TYP_UNDEF) || varTypeIsFloating(type));
        typeOfValue = std::is_same<T, float>::value ? TYP_FLOAT : TYP_DOUBLE;
    }
    else
    {
        assert((type == TYP_UNDEF) || varTypeIsIntegral(type) || varTypeIsGC(type));
        typeOfValue = std::is_same<T, int32_t>::value ? TYP_INT : TYP_LONG;
    }

    if (type == TYP_UNDEF)
    {
        type = typeOfValue;
    }

    assert(type == genActualType(type));

    genTreeOps oper = GT_NONE;
    if (varTypeIsFloating(type))
    {
        oper = GT_CNS_DBL;
    }
    else
    {
        oper = (type == TYP_LONG) ? GT_CNS_NATIVELONG : GT_CNS_INT;
    }

    SetOper(oper);
    gtFlags &= GTF_NODE_MASK;
    gtType = type;

    switch (oper)
    {
        case GT_CNS_INT:
#if !defined(TARGET_64BIT)
            assert(type != TYP_LONG);
#endif
            assert(varTypeIsIntegral(type) || varTypeIsGC(type));
            if (genTypeSize(type) <= genTypeSize(TYP_INT))
            {
                assert(FitsIn<int32_t>(value));
            }

            AsIntCon()->SetIconValue(static_cast<ssize_t>(value));
            AsIntCon()->gtFieldSeq = nullptr;
            break;

#if !defined(TARGET_64BIT)
        case GT_CNS_LNG:
            assert(type == TYP_LONG);
            AsLngCon()->SetLngValue(static_cast<int64_t>(value));
            break;
#endif

        case GT_CNS_DBL:
            assert(varTypeIsFloating(type));
            AsDblCon()->SetDconValue(static_cast<double>(value));
            break;

        default:
            unreached();
    }
}

//------------------------------------------------------------------------
// BashToZeroConst: Bash the node to a constant representing "zero" of "type".
//
// Arguments:
//    type  - Type the bashed node will have, currently only integers,
//            GC types and floating point types are supported.
//
inline void GenTree::BashToZeroConst(var_types type)
{
    if (varTypeIsFloating(type))
    {
        BashToConst(0.0, type);
    }
    else
    {
        assert(varTypeIsIntegral(type) || varTypeIsGC(type));

        // "genActualType" so that we do not create CNS_INT(small type).
        BashToConst(0, genActualType(type));
    }
}

//------------------------------------------------------------------------
// BashToLclVar: Bash node to a LCL_VAR.
//
// Arguments:
//    comp   - compiler object
//    lclNum - the local's number
//
// Return Value:
//    The bashed node.
//
inline GenTreeLclVar* GenTree::BashToLclVar(Compiler* comp, unsigned lclNum)
{
    LclVarDsc* varDsc = comp->lvaGetDesc(lclNum);

    ChangeOper(GT_LCL_VAR);
    ChangeType(varDsc->lvNormalizeOnLoad() ? varDsc->TypeGet() : genActualType(varDsc));
    AsLclVar()->SetLclNum(lclNum);

    return AsLclVar();
}

/*****************************************************************************
 *
 * Returns true if the node is of the "ovf" variety, for example, add.ovf.i1.
 * + gtOverflow() can only be called for valid operators (that is, we know it is one
 *   of the operators which may have GTF_OVERFLOW set).
 * + gtOverflowEx() is more expensive, and should be called only if gtOper may be
 *   an operator for which GTF_OVERFLOW is invalid.
 */

inline bool GenTree::gtOverflow() const
{
    assert(OperMayOverflow());

    if ((gtFlags & GTF_OVERFLOW) != 0)
    {
        assert(varTypeIsIntegral(TypeGet()));

        return true;
    }
    else
    {
        return false;
    }
}

inline bool GenTree::gtOverflowEx() const
{
    return OperMayOverflow() && gtOverflow();
}

/*
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XX                          LclVarsInfo                                      XX
XX                      Inline functions                                     XX
XX                                                                           XX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
*/

inline bool Compiler::lvaHaveManyLocals(float percent) const
{
    assert((percent >= 0.0) && (percent <= 1.0));
    return (lvaCount >= (unsigned)JitConfig.JitMaxLocalsToTrack() * percent);
}

/*****************************************************************************
 *
 *  Allocate a temporary variable or a set of temp variables.
 */

inline unsigned Compiler::lvaGrabTemp(bool shortLifetime DEBUGARG(const char* reason))
{
    if (compIsForInlining())
    {
        // Grab the temp using Inliner's Compiler instance.
        Compiler* pComp = impInlineInfo->InlinerCompiler; // The Compiler instance for the caller (i.e. the inliner)

        if (pComp->lvaHaveManyLocals())
        {
            // Don't create more LclVar with inlining
            compInlineResult->NoteFatal(InlineObservation::CALLSITE_TOO_MANY_LOCALS);
        }

        unsigned tmpNum = pComp->lvaGrabTemp(shortLifetime DEBUGARG(reason));
        lvaTable        = pComp->lvaTable;
        lvaCount        = pComp->lvaCount;
        lvaTableCnt     = pComp->lvaTableCnt;
        return tmpNum;
    }

    // You cannot allocate more space after frame layout!
    noway_assert(lvaDoneFrameLayout < Compiler::TENTATIVE_FRAME_LAYOUT);

    /* Check if the lvaTable has to be grown */
    if (lvaCount + 1 > lvaTableCnt)
    {
        unsigned newLvaTableCnt = lvaCount + (lvaCount / 2) + 1;

        // Check for overflow
        if (newLvaTableCnt <= lvaCount)
        {
            IMPL_LIMITATION("too many locals");
        }

        LclVarDsc* newLvaTable = getAllocator(CMK_LvaTable).allocate<LclVarDsc>(newLvaTableCnt);

        memcpy(newLvaTable, lvaTable, lvaCount * sizeof(*lvaTable));
        memset(newLvaTable + lvaCount, 0, (newLvaTableCnt - lvaCount) * sizeof(*lvaTable));

        for (unsigned i = lvaCount; i < newLvaTableCnt; i++)
        {
            new (&newLvaTable[i], jitstd::placement_t()) LclVarDsc(); // call the constructor.
        }

#ifdef DEBUG
        // Fill the old table with junks. So to detect the un-intended use.
        memset(lvaTable, JitConfig.JitDefaultFill(), lvaCount * sizeof(*lvaTable));
#endif

        lvaTableCnt = newLvaTableCnt;
        lvaTable    = newLvaTable;
    }

    const unsigned tempNum = lvaCount;
    lvaCount++;

    // Initialize lvType, lvIsTemp and lvOnFrame
    lvaTable[tempNum].lvType    = TYP_UNDEF;
    lvaTable[tempNum].lvIsTemp  = shortLifetime;
    lvaTable[tempNum].lvOnFrame = true;

    // If we've started normal ref counting, bump the ref count of this
    // local, as we no longer do any incremental counting, and we presume
    // this new local will be referenced.
    if (lvaLocalVarRefCounted())
    {
        if (opts.OptimizationDisabled())
        {
            lvaTable[tempNum].lvImplicitlyReferenced = 1;
        }
        else
        {
            lvaTable[tempNum].setLvRefCnt(1);
            lvaTable[tempNum].setLvRefCntWtd(BB_UNITY_WEIGHT);
        }
    }

#ifdef DEBUG
    lvaTable[tempNum].lvReason = reason;

    if (verbose)
    {
        printf("\nlvaGrabTemp returning %d (", tempNum);
        gtDispLclVar(tempNum, false);
        printf(")%s called for %s.\n", shortLifetime ? "" : " (a long lifetime temp)", reason);
    }
#endif // DEBUG

    return tempNum;
}

inline unsigned Compiler::lvaGrabTemps(unsigned cnt DEBUGARG(const char* reason))
{
    if (compIsForInlining())
    {
        // Grab the temps using Inliner's Compiler instance.
        unsigned tmpNum = impInlineInfo->InlinerCompiler->lvaGrabTemps(cnt DEBUGARG(reason));

        lvaTable    = impInlineInfo->InlinerCompiler->lvaTable;
        lvaCount    = impInlineInfo->InlinerCompiler->lvaCount;
        lvaTableCnt = impInlineInfo->InlinerCompiler->lvaTableCnt;
        return tmpNum;
    }

#ifdef DEBUG
    if (verbose)
    {
        printf("\nlvaGrabTemps(%d) returning %d..%d (long lifetime temps) called for %s", cnt, lvaCount,
               lvaCount + cnt - 1, reason);
    }
#endif

    // Could handle this...
    assert(!lvaLocalVarRefCounted());

    // You cannot allocate more space after frame layout!
    noway_assert(lvaDoneFrameLayout < Compiler::TENTATIVE_FRAME_LAYOUT);

    /* Check if the lvaTable has to be grown */
    if (lvaCount + cnt > lvaTableCnt)
    {
        unsigned newLvaTableCnt = lvaCount + max(lvaCount / 2 + 1, cnt);

        // Check for overflow
        if (newLvaTableCnt <= lvaCount)
        {
            IMPL_LIMITATION("too many locals");
        }

        LclVarDsc* newLvaTable = getAllocator(CMK_LvaTable).allocate<LclVarDsc>(newLvaTableCnt);

        memcpy(newLvaTable, lvaTable, lvaCount * sizeof(*lvaTable));
        memset(newLvaTable + lvaCount, 0, (newLvaTableCnt - lvaCount) * sizeof(*lvaTable));
        for (unsigned i = lvaCount; i < newLvaTableCnt; i++)
        {
            new (&newLvaTable[i], jitstd::placement_t()) LclVarDsc(); // call the constructor.
        }

#ifdef DEBUG
        // Fill the old table with junks. So to detect the un-intended use.
        memset(lvaTable, JitConfig.JitDefaultFill(), lvaCount * sizeof(*lvaTable));
#endif

        lvaTableCnt = newLvaTableCnt;
        lvaTable    = newLvaTable;
    }

    unsigned tempNum = lvaCount;

    while (cnt--)
    {
        lvaTable[lvaCount].lvType    = TYP_UNDEF; // Initialize lvType, lvIsTemp and lvOnFrame
        lvaTable[lvaCount].lvIsTemp  = false;
        lvaTable[lvaCount].lvOnFrame = true;
        lvaCount++;
    }

    return tempNum;
}

/*****************************************************************************
 *
 *  Allocate a temporary variable which is implicitly used by code-gen
 *  There will be no explicit references to the temp, and so it needs to
 *  be forced to be kept alive, and not be optimized away.
 */

inline unsigned Compiler::lvaGrabTempWithImplicitUse(bool shortLifetime DEBUGARG(const char* reason))
{
    if (compIsForInlining())
    {
        // Grab the temp using Inliner's Compiler instance.
        unsigned tmpNum = impInlineInfo->InlinerCompiler->lvaGrabTempWithImplicitUse(shortLifetime DEBUGARG(reason));

        lvaTable    = impInlineInfo->InlinerCompiler->lvaTable;
        lvaCount    = impInlineInfo->InlinerCompiler->lvaCount;
        lvaTableCnt = impInlineInfo->InlinerCompiler->lvaTableCnt;
        return tmpNum;
    }

    unsigned lclNum = lvaGrabTemp(shortLifetime DEBUGARG(reason));

    LclVarDsc* varDsc = lvaGetDesc(lclNum);

    // Note the implicit use
    varDsc->lvImplicitlyReferenced = 1;

    return lclNum;
}

/*****************************************************************************
 *
 *  Increment the ref counts for a local variable
 */

inline void LclVarDsc::incRefCnts(weight_t weight, Compiler* comp, RefCountState state, bool propagate)
{
    // In minopts and debug codegen, we don't maintain normal ref counts.
    if ((state == RCS_NORMAL) && !comp->PreciseRefCountsRequired())
    {
        // Note, at least, that there is at least one reference.
        lvImplicitlyReferenced = 1;
        return;
    }

    Compiler::lvaPromotionType promotionType = DUMMY_INIT(Compiler::PROMOTION_TYPE_NONE);
    if (varTypeIsPromotable(lvType))
    {
        promotionType = comp->lvaGetPromotionType(this);
    }

    //
    // Increment counts on the local itself.
    //
    if ((lvType != TYP_STRUCT) || (promotionType != Compiler::PROMOTION_TYPE_INDEPENDENT))
    {
        // We increment ref counts of this local for primitive types, including structs that have been retyped as their
        // only field, as well as for structs whose fields are not independently promoted.

        //
        // Increment lvRefCnt
        //
        int newRefCnt = lvRefCnt(state) + 1;
        if (newRefCnt == (unsigned short)newRefCnt) // lvRefCnt is an "unsigned short". Don't overflow it.
        {
            setLvRefCnt((unsigned short)newRefCnt, state);
        }

        //
        // Increment lvRefCntWtd
        //
        if (weight != 0)
        {
            // We double the weight of internal temps

            bool doubleWeight = lvIsTemp;

#if FEATURE_IMPLICIT_BYREFS
            // and, for the time being, implicit byref params
            doubleWeight |= lvIsImplicitByRef;
#endif // FEATURE_IMPLICIT_BYREFS

            if (doubleWeight && (weight * 2 > weight))
            {
                weight *= 2;
            }

            weight_t newWeight = lvRefCntWtd(state) + weight;
            assert(newWeight >= lvRefCntWtd(state));
            setLvRefCntWtd(newWeight, state);
        }
    }

    if (varTypeIsPromotable(lvType) && propagate)
    {
        // For promoted struct locals, increment lvRefCnt on its field locals as well.
        if (promotionType == Compiler::PROMOTION_TYPE_INDEPENDENT ||
            promotionType == Compiler::PROMOTION_TYPE_DEPENDENT)
        {
            for (unsigned i = lvFieldLclStart; i < lvFieldLclStart + lvFieldCnt; ++i)
            {
                comp->lvaTable[i].incRefCnts(weight, comp, state, false); // Don't propagate
            }
        }
    }

    if (lvIsStructField && propagate)
    {
        // Depending on the promotion type, increment the ref count for the parent struct as well.
        promotionType           = comp->lvaGetParentPromotionType(this);
        LclVarDsc* parentvarDsc = comp->lvaGetDesc(lvParentLcl);
        assert(!parentvarDsc->lvRegStruct);
        if (promotionType == Compiler::PROMOTION_TYPE_DEPENDENT)
        {
            parentvarDsc->incRefCnts(weight, comp, state, false); // Don't propagate
        }
    }

#ifdef DEBUG
    if (comp->verbose)
    {
        printf("New refCnts for V%02u: refCnt = %2u, refCntWtd = %s\n", comp->lvaGetLclNum(this), lvRefCnt(state),
               refCntWtd2str(lvRefCntWtd(state)));
    }
#endif
}

/*****************************************************************************
 Is this a synchronized instance method? If so, we will need to report "this"
 in the GC information, so that the EE can release the object lock
 in case of an exception

 We also need to report "this" and keep it alive for all shared generic
 code that gets the actual generic context from the "this" pointer and
 has exception handlers.

 For example, if List<T>::m() is shared between T = object and T = string,
 then inside m() an exception handler "catch E<T>" needs to be able to fetch
 the 'this' pointer to find out what 'T' is in order to tell if we
 should catch the exception or not.
 */

inline bool Compiler::lvaKeepAliveAndReportThis()
{
    if (info.compIsStatic || (lvaTable[0].TypeGet() != TYP_REF))
    {
        return false;
    }

    const bool genericsContextIsThis = (info.compMethodInfo->options & CORINFO_GENERICS_CTXT_FROM_THIS) != 0;

#ifdef JIT32_GCENCODER

    if (info.compFlags & CORINFO_FLG_SYNCH)
        return true;

    if (genericsContextIsThis)
    {
        // TODO: Check if any of the exception clauses are
        // typed using a generic type. Else, we do not need to report this.
        if (info.compXcptnsCount > 0)
            return true;

        if (opts.compDbgCode)
            return true;

        if (lvaGenericsContextInUse)
        {
            JITDUMP("Reporting this as generic context\n");
            return true;
        }
    }
#else // !JIT32_GCENCODER
    // If the generics context is the this pointer we need to report it if either
    // the VM requires us to keep the generics context alive or it is used in a look-up.
    // We keep it alive in the lookup scenario, even when the VM didn't ask us to,
    // because collectible types need the generics context when gc-ing.
    //
    // Methods that can inspire OSR methods must always report context as live
    //
    if (genericsContextIsThis)
    {
        const bool mustKeep      = (info.compMethodInfo->options & CORINFO_GENERICS_CTXT_KEEP_ALIVE) != 0;
        const bool hasPatchpoint = doesMethodHavePatchpoints() || doesMethodHavePartialCompilationPatchpoints();

        if (lvaGenericsContextInUse || mustKeep || hasPatchpoint)
        {
            JITDUMP("Reporting this as generic context: %s\n",
                    mustKeep ? "must keep" : (hasPatchpoint ? "patchpoints" : "referenced"));
            return true;
        }
    }
#endif

    return false;
}

/*****************************************************************************
  Similar to lvaKeepAliveAndReportThis
 */

inline bool Compiler::lvaReportParamTypeArg()
{
    if (info.compMethodInfo->options & (CORINFO_GENERICS_CTXT_FROM_METHODDESC | CORINFO_GENERICS_CTXT_FROM_METHODTABLE))
    {
        assert(info.compTypeCtxtArg != -1);

        // If the VM requires us to keep the generics context alive and report it (for example, if any catch
        // clause catches a type that uses a generic parameter of this method) this flag will be set.
        if (info.compMethodInfo->options & CORINFO_GENERICS_CTXT_KEEP_ALIVE)
        {
            return true;
        }

        // Otherwise, if an exact type parameter is needed in the body, report the generics context.
        // We do this because collectible types needs the generics context when gc-ing.
        if (lvaGenericsContextInUse)
        {
            return true;
        }

        // Methoods that have patchpoints always report context as live
        //
        if (doesMethodHavePatchpoints() || doesMethodHavePartialCompilationPatchpoints())
        {
            return true;
        }
    }

    // Otherwise, we don't need to report it -- the generics context parameter is unused.
    return false;
}

//*****************************************************************************

inline int Compiler::lvaCachedGenericContextArgOffset()
{
    assert(lvaDoneFrameLayout == FINAL_FRAME_LAYOUT);

    return lvaCachedGenericContextArgOffs;
}

//------------------------------------------------------------------------
// lvaFrameAddress: Determine the stack frame offset of the given variable,
// and how to generate an address to that stack frame.
//
// Arguments:
//    varNum         - The variable to inquire about. Positive for user variables
//                     or arguments, negative for spill-temporaries.
//    mustBeFPBased  - [TARGET_ARM only] True if the base register must be FP.
//                     After FINAL_FRAME_LAYOUT, if false, it also requires SP base register.
//    pBaseReg       - [TARGET_ARM only] Out arg. *pBaseReg is set to the base
//                     register to use.
//    addrModeOffset - [TARGET_ARM only] The mode offset within the variable that we need to address.
//                     For example, for a large struct local, and a struct field reference, this will be the offset
//                     of the field. Thus, for V02 + 0x28, if V02 itself is at offset SP + 0x10
//                     then addrModeOffset is what gets added beyond that, here 0x28.
//    isFloatUsage   - [TARGET_ARM only] True if the instruction being generated is a floating
//                     point instruction. This requires using floating-point offset restrictions.
//                     Note that a variable can be non-float, e.g., struct, but accessed as a
//                     float local field.
//    pFPbased       - [non-TARGET_ARM] Out arg. Set *FPbased to true if the
//                     variable is addressed off of FP, false if it's addressed
//                     off of SP.
//
// Return Value:
//    Returns the variable offset from the given base register.
//
inline
#ifdef TARGET_ARM
    int
    Compiler::lvaFrameAddress(
        int varNum, bool mustBeFPBased, regNumber* pBaseReg, int addrModeOffset, bool isFloatUsage)
#else
    int
    Compiler::lvaFrameAddress(int varNum, bool* pFPbased)
#endif
{
    assert(lvaDoneFrameLayout != NO_FRAME_LAYOUT);

    int  varOffset;
    bool FPbased;
    bool fConservative = false;
    if (varNum >= 0)
    {
        LclVarDsc* varDsc          = lvaGetDesc(varNum);
        bool       isPrespilledArg = false;
#if defined(TARGET_ARM) && defined(PROFILING_SUPPORTED)
        isPrespilledArg = varDsc->lvIsParam && compIsProfilerHookNeeded() &&
                          lvaIsPreSpilled(varNum, codeGen->regSet.rsMaskPreSpillRegs(false));
#endif

        // If we have finished with register allocation, and this isn't a stack-based local,
        // check that this has a valid stack location.
        if (lvaDoneFrameLayout > REGALLOC_FRAME_LAYOUT && !varDsc->lvOnFrame)
        {
#ifdef TARGET_AMD64
#ifndef UNIX_AMD64_ABI
            // On amd64, every param has a stack location, except on Unix-like systems.
            assert(varDsc->lvIsParam);
#endif // UNIX_AMD64_ABI
#else  // !TARGET_AMD64
            // For other targets, a stack parameter that is enregistered or prespilled
            // for profiling on ARM will have a stack location.
            assert((varDsc->lvIsParam && !varDsc->lvIsRegArg) || isPrespilledArg);
#endif // !TARGET_AMD64
        }

        FPbased = varDsc->lvFramePointerBased;

#ifdef DEBUG
#if FEATURE_FIXED_OUT_ARGS
        if ((unsigned)varNum == lvaOutgoingArgSpaceVar)
        {
            assert(FPbased == false);
        }
        else
#endif
        {
#if DOUBLE_ALIGN
            assert(FPbased == (isFramePointerUsed() || (genDoubleAlign() && varDsc->lvIsParam && !varDsc->lvIsRegArg)));
#else
#ifdef TARGET_X86
            assert(FPbased == isFramePointerUsed());
#endif
#endif
        }
#endif // DEBUG

        varOffset = varDsc->GetStackOffset();
    }
    else // Its a spill-temp
    {
        FPbased = isFramePointerUsed();
        if (lvaDoneFrameLayout == Compiler::FINAL_FRAME_LAYOUT)
        {
            TempDsc* tmpDsc = codeGen->regSet.tmpFindNum(varNum);
            // The temp might be in use, since this might be during code generation.
            if (tmpDsc == nullptr)
            {
                tmpDsc = codeGen->regSet.tmpFindNum(varNum, RegSet::TEMP_USAGE_USED);
            }
            assert(tmpDsc != nullptr);
            varOffset = tmpDsc->tdTempOffs();
        }
        else
        {
            // This value is an estimate until we calculate the
            // offset after the final frame layout
            // ---------------------------------------------------
            //   :                         :
            //   +-------------------------+ base --+
            //   | LR, ++N for ARM         |        |   frameBaseOffset (= N)
            //   +-------------------------+        |
            //   | R11, ++N for ARM        | <---FP |
            //   +-------------------------+      --+
            //   | compCalleeRegsPushed - N|        |   lclFrameOffset
            //   +-------------------------+      --+
            //   | lclVars                 |        |
            //   +-------------------------+        |
            //   | tmp[MAX_SPILL_TEMP]     |        |
            //   | tmp[1]                  |        |
            //   | tmp[0]                  |        |   compLclFrameSize
            //   +-------------------------+        |
            //   | outgoingArgSpaceSize    |        |
            //   +-------------------------+      --+
            //   |                         | <---SP
            //   :                         :
            // ---------------------------------------------------

            fConservative = true;
            if (!FPbased)
            {
                // Worst case stack based offset.
                CLANG_FORMAT_COMMENT_ANCHOR;
#if FEATURE_FIXED_OUT_ARGS
                int outGoingArgSpaceSize = lvaOutgoingArgSpaceSize;
#else
                int outGoingArgSpaceSize = 0;
#endif
                varOffset = outGoingArgSpaceSize + max(-varNum * TARGET_POINTER_SIZE, (int)lvaGetMaxSpillTempSize());
            }
            else
            {
                // Worst case FP based offset.
                CLANG_FORMAT_COMMENT_ANCHOR;

#ifdef TARGET_ARM
                varOffset = codeGen->genCallerSPtoInitialSPdelta() - codeGen->genCallerSPtoFPdelta();
#else
                varOffset                = -(codeGen->genTotalFrameSize());
#endif
            }
        }
    }

#ifdef TARGET_ARM
    if (FPbased)
    {
        if (mustBeFPBased)
        {
            *pBaseReg = REG_FPBASE;
        }
        // Change the Frame Pointer (R11)-based addressing to the SP-based addressing when possible because
        // it generates smaller code on ARM. See frame picture above for the math.
        else
        {
            // If it is the final frame layout phase, we don't have a choice, we should stick
            // to either FP based or SP based that we decided in the earlier phase. Because
            // we have already selected the instruction. MinOpts will always reserve R10, so
            // for MinOpts always use SP-based offsets, using R10 as necessary, for simplicity.

            int spVarOffset        = fConservative ? compLclFrameSize : varOffset + codeGen->genSPtoFPdelta();
            int actualSPOffset     = spVarOffset + addrModeOffset;
            int actualFPOffset     = varOffset + addrModeOffset;
            int encodingLimitUpper = isFloatUsage ? 0x3FC : 0xFFF;
            int encodingLimitLower = isFloatUsage ? -0x3FC : -0xFF;

            // Use SP-based encoding. During encoding, we'll pick the best encoding for the actual offset we have.
            if (opts.MinOpts() || (actualSPOffset <= encodingLimitUpper))
            {
                varOffset = spVarOffset;
                *pBaseReg = compLocallocUsed ? REG_SAVED_LOCALLOC_SP : REG_SPBASE;
            }
            // Use Frame Pointer (R11)-based encoding.
            else if ((encodingLimitLower <= actualFPOffset) && (actualFPOffset <= encodingLimitUpper))
            {
                *pBaseReg = REG_FPBASE;
            }
            // Otherwise, use SP-based encoding. This is either (1) a small positive offset using a single movw,
            // (2) a large offset using movw/movt. In either case, we must have already reserved
            // the "reserved register", which will get used during encoding.
            else
            {
                varOffset = spVarOffset;
                *pBaseReg = compLocallocUsed ? REG_SAVED_LOCALLOC_SP : REG_SPBASE;
            }
        }
    }
    else
    {
        *pBaseReg = REG_SPBASE;
    }
#else
    *pFPbased                            = FPbased;
#endif

    return varOffset;
}

inline bool Compiler::lvaIsParameter(unsigned varNum)
{
    const LclVarDsc* varDsc = lvaGetDesc(varNum);
    return varDsc->lvIsParam;
}

inline bool Compiler::lvaIsRegArgument(unsigned varNum)
{
    LclVarDsc* varDsc = lvaGetDesc(varNum);
    return varDsc->lvIsRegArg;
}

inline bool Compiler::lvaIsOriginalThisArg(unsigned varNum)
{
    assert(varNum < lvaCount);

    bool isOriginalThisArg = (varNum == info.compThisArg) && (info.compIsStatic == false);

#ifdef DEBUG
    if (isOriginalThisArg)
    {
        LclVarDsc* varDsc = lvaGetDesc(varNum);
        // Should never write to or take the address of the original 'this' arg
        CLANG_FORMAT_COMMENT_ANCHOR;

#ifndef JIT32_GCENCODER
        // With the general encoder/decoder, when the original 'this' arg is needed as a generics context param, we
        // copy to a new local, and mark the original as DoNotEnregister, to
        // ensure that it is stack-allocated.  It should not be the case that the original one can be modified -- it
        // should not be written to, or address-exposed.
        assert(!varDsc->lvHasILStoreOp && (!varDsc->IsAddressExposed() ||
                                           ((info.compMethodInfo->options & CORINFO_GENERICS_CTXT_FROM_THIS) != 0)));
#else
        assert(!varDsc->lvHasILStoreOp && !varDsc->IsAddressExposed());
#endif
    }
#endif

    return isOriginalThisArg;
}

inline bool Compiler::lvaIsOriginalThisReadOnly()
{
    return lvaArg0Var == info.compThisArg;
}

/*****************************************************************************
 *
 *  The following is used to detect the cases where the same local variable#
 *  is used both as a long/double value and a 32-bit value and/or both as an
 *  integer/address and a float value.
 */

inline var_types Compiler::lvaGetActualType(unsigned lclNum)
{
    return genActualType(lvaGetRealType(lclNum));
}

inline var_types Compiler::lvaGetRealType(unsigned lclNum)
{
    return lvaTable[lclNum].TypeGet();
}

/*
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XX                          Importer                                         XX
XX                      Inline functions                                     XX
XX                                                                           XX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
*/

inline unsigned Compiler::compMapILargNum(unsigned ILargNum)
{
    assert(ILargNum < info.compILargsCount);

    // Note that this works because if compRetBuffArg/compTypeCtxtArg/lvVarargsHandleArg are not present
    // they will be BAD_VAR_NUM (MAX_UINT), which is larger than any variable number.
    if (ILargNum >= info.compRetBuffArg)
    {
        ILargNum++;
        assert(ILargNum < info.compLocalsCount); // compLocals count already adjusted.
    }

    if (ILargNum >= (unsigned)info.compTypeCtxtArg)
    {
        ILargNum++;
        assert(ILargNum < info.compLocalsCount); // compLocals count already adjusted.
    }

    if (ILargNum >= (unsigned)lvaVarargsHandleArg)
    {
        ILargNum++;
        assert(ILargNum < info.compLocalsCount); // compLocals count already adjusted.
    }

    assert(ILargNum < info.compArgsCount);
    return (ILargNum);
}

//------------------------------------------------------------------------
// Compiler::mangleVarArgsType: Retype float types to their corresponding
//                            : int/long types.
//
// Notes:
//
// The mangling of types will only occur for incoming vararg fixed arguments
// on windows arm|64 or on armel (softFP).
//
// NO-OP for all other cases.
//
inline var_types Compiler::mangleVarArgsType(var_types type)
{
#if defined(TARGET_ARMARCH)
    if (opts.compUseSoftFP || (TargetOS::IsWindows && info.compIsVarArgs))
    {
        switch (type)
        {
            case TYP_FLOAT:
                return TYP_INT;
            case TYP_DOUBLE:
                return TYP_LONG;
            default:
                break;
        }

        if (varTypeIsSIMD(type))
        {
            // Vectors also get passed in int registers. Use TYP_INT.
            return TYP_INT;
        }
    }
#endif // defined(TARGET_ARMARCH)
    return type;
}

// For CORECLR there is no vararg on System V systems.
inline regNumber Compiler::getCallArgIntRegister(regNumber floatReg)
{
    assert(compFeatureVarArg());
#ifdef TARGET_AMD64
    switch (floatReg)
    {
        case REG_XMM0:
            return REG_RCX;
        case REG_XMM1:
            return REG_RDX;
        case REG_XMM2:
            return REG_R8;
        case REG_XMM3:
            return REG_R9;
        default:
            unreached();
    }
#else  // !TARGET_AMD64
    // How will float args be passed for RyuJIT/x86?
    NYI("getCallArgIntRegister for RyuJIT/x86");
    return REG_NA;
#endif // !TARGET_AMD64
}

inline regNumber Compiler::getCallArgFloatRegister(regNumber intReg)
{
    assert(compFeatureVarArg());
#ifdef TARGET_AMD64
    switch (intReg)
    {
        case REG_RCX:
            return REG_XMM0;
        case REG_RDX:
            return REG_XMM1;
        case REG_R8:
            return REG_XMM2;
        case REG_R9:
            return REG_XMM3;
        default:
            unreached();
    }
#else  // !TARGET_AMD64
    // How will float args be passed for RyuJIT/x86?
    NYI("getCallArgFloatRegister for RyuJIT/x86");
    return REG_NA;
#endif // !TARGET_AMD64
}

/*
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XX                                                                           XX
XX                       FlowGraph                                           XX
XX                      Inline functions                                     XX
XX                                                                           XX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
*/

inline bool Compiler::compCanEncodePtrArgCntMax()
{
#ifdef JIT32_GCENCODER
    // DDB 204533:
    // The GC encoding for fully interruptible methods does not
    // support more than 1023 pushed arguments, so we have to
    // use a partially interruptible GC info/encoding.
    //
    return (fgPtrArgCntMax < MAX_PTRARG_OFS);
#else // JIT32_GCENCODER
    return true;
#endif
}

/*****************************************************************************
 *
 *  Call the given function pointer for all nodes in the tree. The 'visitor'
 *  fn should return one of the following values:
 *
 *  WALK_ABORT          stop walking and return immediately
 *  WALK_CONTINUE       continue walking
 *  WALK_SKIP_SUBTREES  don't walk any subtrees of the node just visited
 *
 *  computeStack - true if we want to make stack visible to callback function
 */

inline Compiler::fgWalkResult Compiler::fgWalkTreePre(
    GenTree** pTree, fgWalkPreFn* visitor, void* callBackData, bool lclVarsOnly, bool computeStack)

{
    fgWalkData walkData;

    walkData.compiler      = this;
    walkData.wtprVisitorFn = visitor;
    walkData.pCallbackData = callBackData;
    walkData.parent        = nullptr;
    walkData.wtprLclsOnly  = lclVarsOnly;
#ifdef DEBUG
    walkData.printModified = false;
#endif

    fgWalkResult result;
    if (lclVarsOnly && computeStack)
    {
        GenericTreeWalker<true, false, true, true> walker(&walkData);
        result = walker.WalkTree(pTree, nullptr);
    }
    else if (lclVarsOnly)
    {
        GenericTreeWalker<true, false, true, true> walker(&walkData);
        result = walker.WalkTree(pTree, nullptr);
    }
    else if (computeStack)
    {
        GenericTreeWalker<true, false, false, true> walker(&walkData);
        result = walker.WalkTree(pTree, nullptr);
    }
    else
    {
        GenericTreeWalker<true, false, false, true> walker(&walkData);
        result = walker.WalkTree(pTree, nullptr);
    }

#ifdef DEBUG
    if (verbose && walkData.printModified)
    {
        gtDispTree(*pTree);
    }
#endif

    return result;
}

/*****************************************************************************
 *
 *  Same as above, except the tree walk is performed in a depth-first fashion,
 *  The 'visitor' fn should return one of the following values:
 *
 *  WALK_ABORT          stop walking and return immediately
 *  WALK_CONTINUE       continue walking
 *
 *  computeStack - true if we want to make stack visible to callback function
 */

inline Compiler::fgWalkResult Compiler::fgWalkTreePost(GenTree**     pTree,
                                                       fgWalkPostFn* visitor,
                                                       void*         callBackData,
                                                       bool          computeStack)
{
    fgWalkData walkData;

    walkData.compiler      = this;
    walkData.wtpoVisitorFn = visitor;
    walkData.pCallbackData = callBackData;
    walkData.parent        = nullptr;

    fgWalkResult result;
    if (computeStack)
    {
        GenericTreeWalker<false, true, false, true> walker(&walkData);
        result = walker.WalkTree(pTree, nullptr);
    }
    else
    {
        GenericTreeWalker<false, true, false, true> walker(&walkData);
        result = walker.WalkTree(pTree, nullptr);
    }

    assert(result == WALK_CONTINUE || result == WALK_ABORT);

    return result;
}

/*****************************************************************************
 *
 *  Call the given function pointer for all nodes in the tree. The 'visitor'
 *  fn should return one of the following values:
 *
 *  WALK_ABORT          stop walking and return immediately
 *  WALK_CONTINUE       continue walking
 *  WALK_SKIP_SUBTREES  don't walk any subtrees of the node just visited
 */

inline Compiler::fgWalkResult Compiler::fgWalkTree(GenTree**    pTree,
                                                   fgWalkPreFn* preVisitor,
                                                   fgWalkPreFn* postVisitor,
                                                   void*        callBackData)

{
    fgWalkData walkData;

    walkData.compiler      = this;
    walkData.wtprVisitorFn = preVisitor;
    walkData.wtpoVisitorFn = postVisitor;
    walkData.pCallbackData = callBackData;
    walkData.parent        = nullptr;
    walkData.wtprLclsOnly  = false;
#ifdef DEBUG
    walkData.printModified = false;
#endif

    fgWalkResult result;

    assert(preVisitor || postVisitor);

    if (preVisitor && postVisitor)
    {
        GenericTreeWalker<true, true, false, true> walker(&walkData);
        result = walker.WalkTree(pTree, nullptr);
    }
    else if (preVisitor)
    {
        GenericTreeWalker<true, false, false, true> walker(&walkData);
        result = walker.WalkTree(pTree, nullptr);
    }
    else
    {
        GenericTreeWalker<false, true, false, true> walker(&walkData);
        result = walker.WalkTree(pTree, nullptr);
    }

#ifdef DEBUG
    if (verbose && walkData.printModified)
    {
        gtDispTree(*pTree);
    }
#endif

    return result;
}

/*****************************************************************************
 *
 * Has this block been added to throw an inlined exception
 * Returns true if the block was added to throw one of:
 *    range-check exception
 *    argument exception (used by feature SIMD)
 *    argument range-check exception (used by feature SIMD)
 *    divide by zero exception  (Not used on X86/X64)
 *    overflow exception
 */

inline bool Compiler::fgIsThrowHlpBlk(BasicBlock* block)
{
    if (!fgRngChkThrowAdded)
    {
        return false;
    }

    if (!block->HasFlag(BBF_INTERNAL) || !block->KindIs(BBJ_THROW))
    {
        return false;
    }

    if (!block->IsLIR() && (block->lastStmt() == nullptr))
    {
        return false;
    }

    // Special check blocks will always end in a throw helper call.
    //
    GenTree* const call = block->lastNode();

    if ((call == nullptr) || (call->gtOper != GT_CALL))
    {
        return false;
    }

    if (!((call->AsCall()->gtCallMethHnd == eeFindHelper(CORINFO_HELP_RNGCHKFAIL)) ||
          (call->AsCall()->gtCallMethHnd == eeFindHelper(CORINFO_HELP_THROWDIVZERO)) ||
          (call->AsCall()->gtCallMethHnd == eeFindHelper(CORINFO_HELP_FAIL_FAST)) ||
          (call->AsCall()->gtCallMethHnd == eeFindHelper(CORINFO_HELP_THROW_ARGUMENTEXCEPTION)) ||
          (call->AsCall()->gtCallMethHnd == eeFindHelper(CORINFO_HELP_THROW_ARGUMENTOUTOFRANGEEXCEPTION)) ||
          (call->AsCall()->gtCallMethHnd == eeFindHelper(CORINFO_HELP_OVERFLOW))))
    {
        return false;
    }

    // We can get to this point for blocks that we didn't create as throw helper blocks
    // under stress, with implausible flow graph optimizations. So, walk the fgAddCodeList
    // for the final determination.

    for (AddCodeDsc* add = fgAddCodeList; add != nullptr; add = add->acdNext)
    {
        if (block == add->acdDstBlk)
        {
            return add->acdKind == SCK_RNGCHK_FAIL || add->acdKind == SCK_DIV_BY_ZERO || add->acdKind == SCK_OVERFLOW ||
                   add->acdKind == SCK_ARG_EXCPN || add->acdKind == SCK_ARG_RNG_EXCPN || add->acdKind == SCK_FAIL_FAST;
        }
    }

    // We couldn't find it in the fgAddCodeList
    return false;
}

#if !FEATURE_FIXED_OUT_ARGS

/*****************************************************************************
 *
 *  Return the stackLevel of the inserted block that throws exception
 *  (by calling the EE helper).
 */

inline unsigned Compiler::fgThrowHlpBlkStkLevel(BasicBlock* block)
{
    for (AddCodeDsc* add = fgAddCodeList; add != nullptr; add = add->acdNext)
    {
        if (block == add->acdDstBlk)
        {
            // Compute assert cond separately as assert macro cannot have conditional compilation directives.
            bool cond =
                (add->acdKind == SCK_RNGCHK_FAIL || add->acdKind == SCK_DIV_BY_ZERO || add->acdKind == SCK_OVERFLOW ||
                 add->acdKind == SCK_ARG_EXCPN || add->acdKind == SCK_ARG_RNG_EXCPN || add->acdKind == SCK_FAIL_FAST);
            assert(cond);

            // TODO: bbTgtStkDepth is DEBUG-only.
            // Should we use it regularly and avoid this search.
            assert(block->bbTgtStkDepth == add->acdStkLvl);
            return add->acdStkLvl;
        }
    }

    noway_assert(!"fgThrowHlpBlkStkLevel should only be called if fgIsThrowHlpBlk() is true, but we can't find the "
                  "block in the fgAddCodeList list");

    /* We couldn't find the basic block: it must not have been a throw helper block */

    return 0;
}

#endif // !FEATURE_FIXED_OUT_ARGS

/*****************************************************************************
  Is the offset too big?
*/
inline bool Compiler::fgIsBigOffset(size_t offset)
{
    return (offset > compMaxUncheckedOffsetForNullObject);
}

/*
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XX                          TempsInfo                                        XX
XX                      Inline functions                                     XX
XX                                                                           XX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
*/

/*****************************************************************************/

/* static */ inline unsigned RegSet::tmpSlot(unsigned size)
{
    noway_assert(size >= sizeof(int));
    noway_assert(size <= TEMP_MAX_SIZE);
    assert((size % sizeof(int)) == 0);

    assert(size < UINT32_MAX);
    return size / sizeof(int) - 1;
}

/*****************************************************************************
 *
 *  Finish allocating temps - should be called each time after a pass is made
 *  over a function body.
 */

inline void RegSet::tmpEnd()
{
#ifdef DEBUG
    if (m_rsCompiler->verbose && (tmpCount > 0))
    {
        printf("%d tmps used\n", tmpCount);
    }
#endif // DEBUG
}

/*****************************************************************************
 *
 *  Shuts down the temp-tracking code. Should be called once per function
 *  compiled.
 */

inline void RegSet::tmpDone()
{
#ifdef DEBUG
    unsigned count;
    TempDsc* temp;

    assert(tmpAllFree());
    for (temp = tmpListBeg(), count = temp ? 1 : 0; temp; temp = tmpListNxt(temp), count += temp ? 1 : 0)
    {
        assert(temp->tdLegalOffset());
    }

    // Make sure that all the temps were released
    assert(count == tmpCount);
    assert(tmpGetCount == 0);
#endif // DEBUG
}

#ifdef DEBUG
inline bool Compiler::shouldUseVerboseTrees()
{
    return (JitConfig.JitDumpVerboseTrees() == 1);
}

inline bool Compiler::shouldUseVerboseSsa()
{
    return (JitConfig.JitDumpVerboseSsa() == 1);
}

//------------------------------------------------------------------------
// shouldDumpASCIITrees: Should we use only ASCII characters for tree dumps?
//
// Notes:
//    This is set to default to 1 in clrConfigValues.h

inline bool Compiler::shouldDumpASCIITrees()
{
    return (JitConfig.JitDumpASCII() == 1);
}

/*****************************************************************************
 *  Should we enable JitStress mode?
 *   0:   No stress
 *   !=2: Vary stress. Performance will be slightly/moderately degraded
 *   2:   Check-all stress. Performance will be REALLY horrible
 */

inline int getJitStressLevel()
{
    return JitConfig.JitStress();
}

#endif // DEBUG

/*****************************************************************************/
/* Map a register argument number ("RegArgNum") to a register number ("RegNum").
 * A RegArgNum is in this range:
 *      [0, MAX_REG_ARG)        -- for integer registers
 *      [0, MAX_FLOAT_REG_ARG)  -- for floating point registers
 * Note that RegArgNum's are overlapping for integer and floating-point registers,
 * while RegNum's are not (for ARM anyway, though for x86, it might be different).
 * If we have a fixed return buffer register and are given it's index
 * we return the fixed return buffer register
 */

inline regNumber genMapIntRegArgNumToRegNum(unsigned argNum)
{
    if (hasFixedRetBuffReg() && (argNum == theFixedRetBuffArgNum()))
    {
        return theFixedRetBuffReg();
    }

    assert(argNum < ArrLen(intArgRegs));

    return intArgRegs[argNum];
}

inline regNumber genMapFloatRegArgNumToRegNum(unsigned argNum)
{
#ifndef TARGET_X86
    assert(argNum < ArrLen(fltArgRegs));

    return fltArgRegs[argNum];
#else
    assert(!"no x86 float arg regs\n");
    return REG_NA;
#endif
}

__forceinline regNumber genMapRegArgNumToRegNum(unsigned argNum, var_types type)
{
    if (varTypeUsesFloatArgReg(type))
    {
        return genMapFloatRegArgNumToRegNum(argNum);
    }
    else
    {
        return genMapIntRegArgNumToRegNum(argNum);
    }
}

/*****************************************************************************/
/* Map a register argument number ("RegArgNum") to a register mask of the associated register.
 * Note that for floating-pointer registers, only the low register for a register pair
 * (for a double on ARM) is returned.
 */

inline regMaskTP genMapIntRegArgNumToRegMask(unsigned argNum)
{
    assert(argNum < ArrLen(intArgMasks));

    return intArgMasks[argNum];
}

inline regMaskTP genMapFloatRegArgNumToRegMask(unsigned argNum)
{
#ifndef TARGET_X86
    assert(argNum < ArrLen(fltArgMasks));

    return fltArgMasks[argNum];
#else
    assert(!"no x86 float arg regs\n");
    return RBM_NONE;
#endif
}

__forceinline regMaskTP genMapArgNumToRegMask(unsigned argNum, var_types type)
{
    regMaskTP result;
    if (varTypeUsesFloatArgReg(type))
    {
        result = genMapFloatRegArgNumToRegMask(argNum);
#ifdef TARGET_ARM
        if (type == TYP_DOUBLE)
        {
            assert((result & RBM_ALLDOUBLE) != 0);
            result |= (result << 1);
        }
#endif
    }
    else
    {
        result = genMapIntRegArgNumToRegMask(argNum);
    }
    return result;
}

/*****************************************************************************/
/* Map a register number ("RegNum") to a register argument number ("RegArgNum")
 * If we have a fixed return buffer register we return theFixedRetBuffArgNum
 */

inline unsigned genMapIntRegNumToRegArgNum(regNumber regNum)
{
    assert(genRegMask(regNum) & fullIntArgRegMask());

    switch (regNum)
    {
        case REG_ARG_0:
            return 0;
#if MAX_REG_ARG >= 2
        case REG_ARG_1:
            return 1;
#if MAX_REG_ARG >= 3
        case REG_ARG_2:
            return 2;
#if MAX_REG_ARG >= 4
        case REG_ARG_3:
            return 3;
#if MAX_REG_ARG >= 5
        case REG_ARG_4:
            return 4;
#if MAX_REG_ARG >= 6
        case REG_ARG_5:
            return 5;
#if MAX_REG_ARG >= 7
        case REG_ARG_6:
            return 6;
#if MAX_REG_ARG >= 8
        case REG_ARG_7:
            return 7;
#endif
#endif
#endif
#endif
#endif
#endif
#endif
        default:
            // Check for the Arm64 fixed return buffer argument register
            if (hasFixedRetBuffReg() && (regNum == theFixedRetBuffReg()))
            {
                return theFixedRetBuffArgNum();
            }
            else
            {
                assert(!"invalid register arg register");
                return BAD_VAR_NUM;
            }
    }
}

inline unsigned genMapFloatRegNumToRegArgNum(regNumber regNum)
{
    assert(genRegMask(regNum) & RBM_FLTARG_REGS);

#ifdef TARGET_ARM
    return regNum - REG_F0;
#elif defined(TARGET_LOONGARCH64)
    return regNum - REG_F0;
#elif defined(TARGET_RISCV64)
    return regNum - REG_FLTARG_0;
#elif defined(TARGET_ARM64)
    return regNum - REG_V0;
#elif defined(UNIX_AMD64_ABI)
    return regNum - REG_FLTARG_0;
#else

#if MAX_FLOAT_REG_ARG >= 1
    switch (regNum)
    {
        case REG_FLTARG_0:
            return 0;
#if MAX_REG_ARG >= 2
        case REG_FLTARG_1:
            return 1;
#if MAX_REG_ARG >= 3
        case REG_FLTARG_2:
            return 2;
#if MAX_REG_ARG >= 4
        case REG_FLTARG_3:
            return 3;
#if MAX_REG_ARG >= 5
        case REG_FLTARG_4:
            return 4;
#endif
#endif
#endif
#endif
        default:
            assert(!"invalid register arg register");
            return BAD_VAR_NUM;
    }
#else
    assert(!"flt reg args not allowed");
    return BAD_VAR_NUM;
#endif
#endif // !arm
}

inline unsigned genMapRegNumToRegArgNum(regNumber regNum, var_types type)
{
    if (varTypeUsesFloatArgReg(type))
    {
        return genMapFloatRegNumToRegArgNum(regNum);
    }
    else
    {
        return genMapIntRegNumToRegArgNum(regNum);
    }
}

/*****************************************************************************/
/* Return a register mask with the first 'numRegs' argument registers set.
 */

inline regMaskTP genIntAllRegArgMask(unsigned numRegs)
{
    assert(numRegs <= MAX_REG_ARG);

    regMaskTP result = RBM_NONE;
    for (unsigned i = 0; i < numRegs; i++)
    {
        result |= intArgMasks[i];
    }
    return result;
}

inline regMaskTP genFltAllRegArgMask(unsigned numRegs)
{
#ifndef TARGET_X86
    assert(numRegs <= MAX_FLOAT_REG_ARG);

    regMaskTP result = RBM_NONE;
    for (unsigned i = 0; i < numRegs; i++)
    {
        result |= fltArgMasks[i];
    }
    return result;
#else
    assert(!"no x86 float arg regs\n");
    return RBM_NONE;
#endif
}

/*
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XX                          Liveness                                         XX
XX                      Inline functions                                     XX
XX                                                                           XX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
*/

//------------------------------------------------------------------------
// compUpdateLife: Update the GC's masks, register's masks and reports change on variable's homes given a set of
//    current live variables if changes have happened since "compCurLife".
//
// Arguments:
//    newLife - the set of variables that are alive.
//
// Assumptions:
//    The set of live variables reflects the result of only emitted code, it should not be considering the becoming
//    live/dead of instructions that has not been emitted yet. This is requires by "compChangeLife".
template <bool ForCodeGen>
inline void Compiler::compUpdateLife(VARSET_VALARG_TP newLife)
{
    if (!VarSetOps::Equal(this, compCurLife, newLife))
    {
        compChangeLife<ForCodeGen>(newLife);
    }
#ifdef DEBUG
    else
    {
        if (verbose)
        {
            printf("Liveness not changing: %s ", VarSetOps::ToString(this, compCurLife));
            dumpConvertedVarSet(this, compCurLife);
            printf("\n");
        }
    }
#endif // DEBUG
}

/*****************************************************************************
 *
 *  We stash cookies in basic blocks for the code emitter; this call retrieves
 *  the cookie associated with the given basic block.
 */

inline void* emitCodeGetCookie(const BasicBlock* block)
{
    assert(block);
    return block->bbEmitCookie;
}

/*
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XX                          Optimizer                                        XX
XX                      Inline functions                                     XX
XX                                                                           XX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
*/

/*****************************************************************************
 *
 *  The following resets the value assignment table
 *  used only during local assertion prop
 */

inline void Compiler::optAssertionReset(AssertionIndex limit)
{
    PREFAST_ASSUME(optAssertionCount <= optMaxAssertionCount);

    while (optAssertionCount > limit)
    {
        AssertionIndex index        = optAssertionCount;
        AssertionDsc*  curAssertion = optGetAssertion(index);
        optAssertionCount--;
        unsigned lclNum = curAssertion->op1.lcl.lclNum;
        assert(lclNum < lvaCount);
        BitVecOps::RemoveElemD(apTraits, GetAssertionDep(lclNum), index - 1);

        //
        // Find the Copy assertions
        //
        if ((curAssertion->assertionKind == OAK_EQUAL) && (curAssertion->op1.kind == O1K_LCLVAR) &&
            (curAssertion->op2.kind == O2K_LCLVAR_COPY))
        {
            //
            //  op2.lcl.lclNum no longer depends upon this assertion
            //
            lclNum = curAssertion->op2.lcl.lclNum;
            BitVecOps::RemoveElemD(apTraits, GetAssertionDep(lclNum), index - 1);
        }
    }
    while (optAssertionCount < limit)
    {
        AssertionIndex index        = ++optAssertionCount;
        AssertionDsc*  curAssertion = optGetAssertion(index);
        unsigned       lclNum       = curAssertion->op1.lcl.lclNum;
        BitVecOps::AddElemD(apTraits, GetAssertionDep(lclNum), index - 1);

        //
        // Check for Copy assertions
        //
        if ((curAssertion->assertionKind == OAK_EQUAL) && (curAssertion->op1.kind == O1K_LCLVAR) &&
            (curAssertion->op2.kind == O2K_LCLVAR_COPY))
        {
            //
            //  op2.lcl.lclNum now depends upon this assertion
            //
            lclNum = curAssertion->op2.lcl.lclNum;
            BitVecOps::AddElemD(apTraits, GetAssertionDep(lclNum), index - 1);
        }
    }
}

/*****************************************************************************
 *
 *  The following removes the i-th entry in the value assignment table
 *  used only during local assertion prop
 */

inline void Compiler::optAssertionRemove(AssertionIndex index)
{
    assert(index > 0);
    assert(index <= optAssertionCount);
    PREFAST_ASSUME(optAssertionCount <= optMaxAssertionCount);

    AssertionDsc* curAssertion = optGetAssertion(index);

    //  Two cases to consider if (index == optAssertionCount) then the last
    //  entry in the table is to be removed and that happens automatically when
    //  optAssertionCount is decremented and we can just clear the optAssertionDep bits
    //  The other case is when index < optAssertionCount and here we overwrite the
    //  index-th entry in the table with the data found at the end of the table
    //  Since we are reordering the rable the optAssertionDep bits need to be recreated
    //  using optAssertionReset(0) and optAssertionReset(newAssertionCount) will
    //  correctly update the optAssertionDep bits
    //
    if (index == optAssertionCount)
    {
        unsigned lclNum = curAssertion->op1.lcl.lclNum;
        BitVecOps::RemoveElemD(apTraits, GetAssertionDep(lclNum), index - 1);

        //
        // Check for Copy assertions
        //
        if ((curAssertion->assertionKind == OAK_EQUAL) && (curAssertion->op1.kind == O1K_LCLVAR) &&
            (curAssertion->op2.kind == O2K_LCLVAR_COPY))
        {
            //
            //  op2.lcl.lclNum no longer depends upon this assertion
            //
            lclNum = curAssertion->op2.lcl.lclNum;
            BitVecOps::RemoveElemD(apTraits, GetAssertionDep(lclNum), index - 1);
        }

        optAssertionCount--;
    }
    else
    {
        AssertionDsc*  lastAssertion     = optGetAssertion(optAssertionCount);
        AssertionIndex newAssertionCount = optAssertionCount - 1;

        optAssertionReset(0); // This make optAssertionCount equal 0

        memcpy(curAssertion,  // the entry to be removed
               lastAssertion, // last entry in the table
               sizeof(AssertionDsc));

        optAssertionReset(newAssertionCount);
    }
}

/*
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XX                          EEInterface                                      XX
XX                      Inline functions                                     XX
XX                                                                           XX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
*/

extern var_types JITtype2varType(CorInfoType type);

#include "ee_il_dll.hpp"

inline CORINFO_METHOD_HANDLE Compiler::eeFindHelper(unsigned helper)
{
    assert(helper < CORINFO_HELP_COUNT);

    /* Helpers are marked by the fact that they are odd numbers
     * force this to be an odd number (will shift it back to extract) */

    return ((CORINFO_METHOD_HANDLE)((((size_t)helper) << 2) + 1));
}

inline CorInfoHelpFunc Compiler::eeGetHelperNum(CORINFO_METHOD_HANDLE method)
{
    // Helpers are marked by the fact that they are odd numbers
    if (!(((size_t)method) & 1))
    {
        return (CORINFO_HELP_UNDEF);
    }
    return ((CorInfoHelpFunc)(((size_t)method) >> 2));
}

//------------------------------------------------------------------------
// IsStaticHelperEligibleForExpansion: Determine whether this node is a static init
//    helper eligible for late expansion
//
// Arguments:
//    tree       - tree node
//    isGC       - [OUT] whether the helper returns GCStaticBase or NonGCStaticBase
//    retValKind - [OUT] describes its return value
//
// Return Value:
//    Returns true if eligible for late expansion
//
inline bool Compiler::IsStaticHelperEligibleForExpansion(GenTree* tree, bool* isGc, StaticHelperReturnValue* retValKind)
{
    if (!tree->IsHelperCall())
    {
        return false;
    }

    bool                    gc     = false;
    bool                    result = false;
    StaticHelperReturnValue retVal = {};
    switch (eeGetHelperNum(tree->AsCall()->gtCallMethHnd))
    {
        case CORINFO_HELP_READYTORUN_GCSTATIC_BASE:
        case CORINFO_HELP_GETSHARED_GCSTATIC_BASE:
            result = true;
            gc     = true;
            retVal = SHRV_STATIC_BASE_PTR;
            break;
        case CORINFO_HELP_READYTORUN_NONGCSTATIC_BASE:
        case CORINFO_HELP_GETSHARED_NONGCSTATIC_BASE:
            result = true;
            gc     = false;
            retVal = SHRV_STATIC_BASE_PTR;
            break;
        // TODO: other helpers
        default:
            break;
    }
    if (isGc != nullptr)
    {
        *isGc = gc;
    }
    if (retValKind != nullptr)
    {
        *retValKind = retVal;
    }
    return result;
}

//  TODO-Cleanup: Replace calls to IsSharedStaticHelper with new HelperCallProperties
//

inline bool Compiler::IsSharedStaticHelper(GenTree* tree)
{
    if (tree->gtOper != GT_CALL || tree->AsCall()->gtCallType != CT_HELPER)
    {
        return false;
    }

    CorInfoHelpFunc helper = eeGetHelperNum(tree->AsCall()->gtCallMethHnd);

    bool result1 =
        // More helpers being added to IsSharedStaticHelper (that have similar behaviors but are not true
        // ShareStaticHelpers)
        helper == CORINFO_HELP_STRCNS || helper == CORINFO_HELP_BOX ||

        // helpers being added to IsSharedStaticHelper
        helper == CORINFO_HELP_GETSTATICFIELDADDR_TLS || helper == CORINFO_HELP_GETGENERICS_GCSTATIC_BASE ||
        helper == CORINFO_HELP_GETGENERICS_NONGCSTATIC_BASE || helper == CORINFO_HELP_GETGENERICS_GCTHREADSTATIC_BASE ||
        helper == CORINFO_HELP_GETGENERICS_NONGCTHREADSTATIC_BASE ||

        helper == CORINFO_HELP_GETSHARED_GCSTATIC_BASE || helper == CORINFO_HELP_GETSHARED_NONGCSTATIC_BASE ||
        helper == CORINFO_HELP_GETSHARED_GCSTATIC_BASE_NOCTOR ||
        helper == CORINFO_HELP_GETSHARED_NONGCSTATIC_BASE_NOCTOR ||
        helper == CORINFO_HELP_GETSHARED_GCSTATIC_BASE_DYNAMICCLASS ||
        helper == CORINFO_HELP_GETSHARED_NONGCSTATIC_BASE_DYNAMICCLASS ||
        helper == CORINFO_HELP_GETSHARED_GCTHREADSTATIC_BASE ||
        helper == CORINFO_HELP_GETSHARED_NONGCTHREADSTATIC_BASE ||
        helper == CORINFO_HELP_GETSHARED_GCTHREADSTATIC_BASE_NOCTOR ||
        helper == CORINFO_HELP_GETSHARED_GCTHREADSTATIC_BASE_NOCTOR_OPTIMIZED ||
        helper == CORINFO_HELP_GETSHARED_NONGCTHREADSTATIC_BASE_NOCTOR ||
        helper == CORINFO_HELP_GETSHARED_NONGCTHREADSTATIC_BASE_NOCTOR_OPTIMIZED ||
        helper == CORINFO_HELP_GETSHARED_GCTHREADSTATIC_BASE_DYNAMICCLASS ||
        helper == CORINFO_HELP_GETSHARED_NONGCTHREADSTATIC_BASE_DYNAMICCLASS ||
#ifdef FEATURE_READYTORUN
        helper == CORINFO_HELP_READYTORUN_GENERIC_STATIC_BASE || helper == CORINFO_HELP_READYTORUN_GCSTATIC_BASE ||
        helper == CORINFO_HELP_READYTORUN_NONGCSTATIC_BASE || helper == CORINFO_HELP_READYTORUN_THREADSTATIC_BASE ||
        helper == CORINFO_HELP_READYTORUN_THREADSTATIC_BASE_NOCTOR ||
        helper == CORINFO_HELP_READYTORUN_NONGCTHREADSTATIC_BASE ||
#endif
        helper == CORINFO_HELP_CLASSINIT_SHARED_DYNAMICCLASS;
#if 0
    // See above TODO-Cleanup
    bool result2 = s_helperCallProperties.IsPure(helper) && s_helperCallProperties.NonNullReturn(helper);
    assert (result1 == result2);
#endif
    return result1;
}

inline bool Compiler::IsGcSafePoint(GenTreeCall* call)
{
    if (!call->IsFastTailCall())
    {
        if (call->IsUnmanaged() && call->IsSuppressGCTransition())
        {
            // Both an indirect and user calls can be unmanaged
            // and have a request to suppress the GC transition so
            // the check is done prior to the separate handling of
            // indirect and user calls.
            return false;
        }
        else if (call->gtCallType == CT_INDIRECT)
        {
            return true;
        }
        else if (call->gtCallType == CT_USER_FUNC)
        {
            if ((call->gtCallMoreFlags & GTF_CALL_M_NOGCCHECK) == 0)
            {
                return true;
            }
        }
        // otherwise we have a CT_HELPER
    }

    return false;
}

//
// Note that we want to have two special FIELD_HANDLES that will both
// be considered non-Data Offset handles
//
// The special values that we use are FLD_GLOBAL_DS, FLD_GLOBAL_FS or FLD_GLOBAL_GS.
//

inline bool jitStaticFldIsGlobAddr(CORINFO_FIELD_HANDLE fldHnd)
{
    return (fldHnd == FLD_GLOBAL_DS || fldHnd == FLD_GLOBAL_FS || fldHnd == FLD_GLOBAL_GS);
}

/*
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XX                          Compiler                                         XX
XX                      Inline functions                                     XX
XX                                                                           XX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
*/

#ifndef DEBUG
inline bool Compiler::compStressCompile(compStressArea stressArea, unsigned weightPercentage)
{
    return false;
}
#endif

inline ArenaAllocator* Compiler::compGetArenaAllocator()
{
    return compArenaAllocator;
}

inline bool Compiler::compIsProfilerHookNeeded() const
{
#ifdef PROFILING_SUPPORTED
    return compProfilerHookNeeded
           // IL stubs are excluded by VM and we need to do the same even running
           // under a complus env hook to generate profiler hooks
           || (opts.compJitELTHookEnabled && !opts.jitFlags->IsSet(JitFlags::JIT_FLAG_IL_STUB));
#else  // !PROFILING_SUPPORTED
    return false;
#endif // !PROFILING_SUPPORTED
}

/*****************************************************************************
 *
 *  Check for the special case where the object is the methods original 'this' pointer.
 *  Note that, the original 'this' pointer is always local var 0 for non-static method,
 *  even if we might have created the copy of 'this' pointer in lvaArg0Var.
 */

inline bool Compiler::impIsThis(GenTree* obj)
{
    if (compIsForInlining())
    {
        return impInlineInfo->InlinerCompiler->impIsThis(obj);
    }
    else
    {
        return ((obj != nullptr) && (obj->gtOper == GT_LCL_VAR) &&
                lvaIsOriginalThisArg(obj->AsLclVarCommon()->GetLclNum()));
    }
}

/*****************************************************************************
 *
 *  Returns true if the compiler instance is created for inlining.
 */

inline bool Compiler::compIsForInlining() const
{
    return (impInlineInfo != nullptr);
}

/*****************************************************************************
 *
 *  Check the inline result field in the compiler to see if inlining failed or not.
 */

inline bool Compiler::compDonotInline()
{
    if (compIsForInlining())
    {
        assert(compInlineResult != nullptr);
        return compInlineResult->IsFailure();
    }
    else
    {
        return false;
    }
}

inline bool Compiler::impIsPrimitive(CorInfoType jitType)
{
    return ((CORINFO_TYPE_BOOL <= jitType && jitType <= CORINFO_TYPE_DOUBLE) || jitType == CORINFO_TYPE_PTR);
}

/*****************************************************************************
 *
 *  Get the promotion type of a struct local.
 */

inline Compiler::lvaPromotionType Compiler::lvaGetPromotionType(const LclVarDsc* varDsc)
{
    assert(!varDsc->lvPromoted || varTypeIsPromotable(varDsc) || varDsc->lvUnusedStruct);

    if (!varDsc->lvPromoted)
    {
        // no struct promotion for this LclVar
        return PROMOTION_TYPE_NONE;
    }
    if (varDsc->lvDoNotEnregister)
    {
        // The struct is not enregistered
        return PROMOTION_TYPE_DEPENDENT;
    }
    if (!varDsc->lvIsParam)
    {
        // The struct is a register candidate
        return PROMOTION_TYPE_INDEPENDENT;
    }

// We have a parameter that could be enregistered
#if defined(TARGET_ARM)
    // TODO-Cleanup: return INDEPENDENT for arm32.
    return PROMOTION_TYPE_DEPENDENT;
#else  // !TARGET_ARM
    return PROMOTION_TYPE_INDEPENDENT;
#endif // !TARGET_ARM
}

/*****************************************************************************
 *
 *  Get the promotion type of a struct local.
 */

inline Compiler::lvaPromotionType Compiler::lvaGetPromotionType(unsigned varNum)
{
    return lvaGetPromotionType(lvaGetDesc(varNum));
}

/*****************************************************************************
 *
 *  Given a field local, get the promotion type of its parent struct local.
 */

inline Compiler::lvaPromotionType Compiler::lvaGetParentPromotionType(const LclVarDsc* varDsc)
{
    assert(varDsc->lvIsStructField);

    lvaPromotionType promotionType = lvaGetPromotionType(varDsc->lvParentLcl);
    assert(promotionType != PROMOTION_TYPE_NONE);
    return promotionType;
}

/*****************************************************************************
 *
 *  Given a field local, get the promotion type of its parent struct local.
 */

inline Compiler::lvaPromotionType Compiler::lvaGetParentPromotionType(unsigned varNum)
{
    return lvaGetParentPromotionType(lvaGetDesc(varNum));
}

/*****************************************************************************
 *
 *  Return true if the local is a field local of a promoted struct of type PROMOTION_TYPE_DEPENDENT.
 *  Return false otherwise.
 */

inline bool Compiler::lvaIsFieldOfDependentlyPromotedStruct(const LclVarDsc* varDsc)
{
    if (!varDsc->lvIsStructField)
    {
        return false;
    }

    lvaPromotionType promotionType = lvaGetParentPromotionType(varDsc);
    if (promotionType == PROMOTION_TYPE_DEPENDENT)
    {
        return true;
    }

    assert(promotionType == PROMOTION_TYPE_INDEPENDENT);
    return false;
}

//------------------------------------------------------------------------
// lvaIsGCTracked: Determine whether this var should be reported
//    as tracked for GC purposes.
//
// Arguments:
//    varDsc - the LclVarDsc for the var in question.
//
// Return Value:
//    Returns true if the variable should be reported as tracked in the GC info.
//
// Notes:
//    This never returns true for struct variables, even if they are tracked.
//    This is because struct variables are never tracked as a whole for GC purposes.
//    It is up to the caller to ensure that the fields of struct variables are
//    correctly tracked.
//
//    We never GC-track fields of dependently promoted structs, even
//    though they may be tracked for optimization purposes.
//
inline bool Compiler::lvaIsGCTracked(const LclVarDsc* varDsc)
{
    if (varDsc->lvTracked && (varDsc->lvType == TYP_REF || varDsc->lvType == TYP_BYREF))
    {
        // Stack parameters are always untracked w.r.t. GC reportings
        const bool isStackParam = varDsc->lvIsParam && !varDsc->lvIsRegArg;
        return !isStackParam && !lvaIsFieldOfDependentlyPromotedStruct(varDsc);
    }
    else
    {
        return false;
    }
}

/*****************************************************************************/
#if MEASURE_CLRAPI_CALLS

inline void Compiler::CLRApiCallEnter(unsigned apix)
{
    if (pCompJitTimer != nullptr)
    {
        pCompJitTimer->CLRApiCallEnter(apix);
    }
}
inline void Compiler::CLRApiCallLeave(unsigned apix)
{
    if (pCompJitTimer != nullptr)
    {
        pCompJitTimer->CLRApiCallLeave(apix);
    }
}

inline void Compiler::CLR_API_Enter(API_ICorJitInfo_Names ename)
{
    CLRApiCallEnter(ename);
}

inline void Compiler::CLR_API_Leave(API_ICorJitInfo_Names ename)
{
    CLRApiCallLeave(ename);
}

#endif // MEASURE_CLRAPI_CALLS

//------------------------------------------------------------------------------
// fgVarIsNeverZeroInitializedInProlog : Check whether the variable is never zero initialized in the prolog.
//
// Arguments:
//    varNum     -       local variable number
//
// Returns:
//             true if this is a special variable that is never zero initialized in the prolog;
//             false otherwise
//

bool Compiler::fgVarIsNeverZeroInitializedInProlog(unsigned varNum)
{
    LclVarDsc* varDsc = lvaGetDesc(varNum);
    bool       result = varDsc->lvIsParam || lvaIsOSRLocal(varNum) || (varNum == lvaGSSecurityCookie) ||
                  (varNum == lvaInlinedPInvokeFrameVar) || (varNum == lvaStubArgumentVar) || (varNum == lvaRetAddrVar);

#if FEATURE_FIXED_OUT_ARGS
    result = result || (varNum == lvaOutgoingArgSpaceVar);
#endif

#if defined(FEATURE_EH_FUNCLETS)
    result = result || (varNum == lvaPSPSym);
#endif

    return result;
}

//------------------------------------------------------------------------------
// fgVarNeedsExplicitZeroInit : Check whether the variable needs an explicit zero initialization.
//
// Arguments:
//    varNum     -       local var number
//    bbInALoop  -       true if the basic block may be in a loop
//    bbIsReturn -       true if the basic block always returns
//
// Returns:
//             true if the var needs explicit zero-initialization in this basic block;
//             false otherwise
//
// Notes:
//     If the variable is not being initialized in a loop, we can avoid explicit zero initialization if
//      - the variable is a gc pointer, or
//      - the variable is a struct with gc pointer fields and either all fields are gc pointer fields
//           or the struct is big enough to guarantee block initialization, or
//      - compInitMem is set and the variable has a long lifetime or has gc fields.
//     In these cases we will insert zero-initialization in the prolog if necessary.

bool Compiler::fgVarNeedsExplicitZeroInit(unsigned varNum, bool bbInALoop, bool bbIsReturn)
{
    LclVarDsc* varDsc = lvaGetDesc(varNum);

    if (lvaIsFieldOfDependentlyPromotedStruct(varDsc))
    {
        // Fields of dependently promoted structs may only be initialized in the prolog when the whole
        // struct is initialized in the prolog.
        return fgVarNeedsExplicitZeroInit(varDsc->lvParentLcl, bbInALoop, bbIsReturn);
    }

    if (bbInALoop && !bbIsReturn)
    {
        return true;
    }

    if (varDsc->lvHasExplicitInit)
    {
        return true;
    }

    if (fgVarIsNeverZeroInitializedInProlog(varNum))
    {
        return true;
    }

    if (varTypeIsGC(varDsc->lvType))
    {
        return false;
    }

    if ((varDsc->lvType == TYP_STRUCT) && varDsc->HasGCPtr())
    {
        ClassLayout* layout = varDsc->GetLayout();
        if (layout->GetSlotCount() == layout->GetGCPtrCount())
        {
            return false;
        }

// Below conditions guarantee block initialization, which will initialize
// all struct fields. If the logic for block initialization in CodeGen::genCheckUseBlockInit()
// changes, these conditions need to be updated.
#ifdef TARGET_64BIT
#if defined(TARGET_AMD64)
        // We can clear using aligned SIMD so the threshold is lower,
        // and clears in order which is better for auto-prefetching
        if (roundUp(varDsc->lvSize(), TARGET_POINTER_SIZE) / sizeof(int) > 4)
#else // !defined(TARGET_AMD64)
        if (roundUp(varDsc->lvSize(), TARGET_POINTER_SIZE) / sizeof(int) > 8)
#endif
#else
        if (roundUp(varDsc->lvSize(), TARGET_POINTER_SIZE) / sizeof(int) > 4)
#endif
        {
            return false;
        }
    }

    return !info.compInitMem || (varDsc->lvIsTemp && !varDsc->HasGCPtr());
}

inline bool Compiler::PreciseRefCountsRequired()
{
    return opts.OptimizationEnabled();
}

template <typename TVisitor>
void GenTree::VisitOperands(TVisitor visitor)
{
    switch (OperGet())
    {
        // Leaf nodes
        case GT_LCL_VAR:
        case GT_LCL_FLD:
        case GT_LCL_ADDR:
        case GT_CATCH_ARG:
        case GT_LABEL:
        case GT_FTN_ADDR:
        case GT_RET_EXPR:
        case GT_CNS_INT:
        case GT_CNS_LNG:
        case GT_CNS_DBL:
        case GT_CNS_STR:
        case GT_CNS_VEC:
        case GT_MEMORYBARRIER:
        case GT_JMP:
        case GT_JCC:
        case GT_SETCC:
        case GT_NO_OP:
        case GT_START_NONGC:
        case GT_START_PREEMPTGC:
        case GT_PROF_HOOK:
#if !defined(FEATURE_EH_FUNCLETS)
        case GT_END_LFIN:
#endif // !FEATURE_EH_FUNCLETS
        case GT_PHI_ARG:
        case GT_JMPTABLE:
        case GT_PHYSREG:
        case GT_EMITNOP:
        case GT_PINVOKE_PROLOG:
        case GT_PINVOKE_EPILOG:
        case GT_IL_OFFSET:
        case GT_NOP:
            return;

        // Unary operators with an optional operand
        case GT_FIELD_ADDR:
        case GT_RETURN:
        case GT_RETFILT:
            if (this->AsUnOp()->gtOp1 == nullptr)
            {
                return;
            }
            FALLTHROUGH;

        // Standard unary operators
        case GT_STORE_LCL_VAR:
        case GT_STORE_LCL_FLD:
        case GT_NOT:
        case GT_NEG:
        case GT_BSWAP:
        case GT_BSWAP16:
        case GT_COPY:
        case GT_RELOAD:
        case GT_ARR_LENGTH:
        case GT_MDARR_LENGTH:
        case GT_MDARR_LOWER_BOUND:
        case GT_CAST:
        case GT_BITCAST:
        case GT_CKFINITE:
        case GT_LCLHEAP:
        case GT_IND:
        case GT_BLK:
        case GT_BOX:
        case GT_ALLOCOBJ:
        case GT_INIT_VAL:
        case GT_RUNTIMELOOKUP:
        case GT_ARR_ADDR:
        case GT_JTRUE:
        case GT_SWITCH:
        case GT_NULLCHECK:
        case GT_PUTARG_REG:
        case GT_PUTARG_STK:
#if FEATURE_ARG_SPLIT
        case GT_PUTARG_SPLIT:
#endif // FEATURE_ARG_SPLIT
        case GT_RETURNTRAP:
        case GT_KEEPALIVE:
        case GT_INC_SATURATE:
            visitor(this->AsUnOp()->gtOp1);
            return;

// Variadic nodes
#if defined(FEATURE_HW_INTRINSICS)
        case GT_HWINTRINSIC:
            for (GenTree* operand : this->AsMultiOp()->Operands())
            {
                if (visitor(operand) == VisitResult::Abort)
                {
                    break;
                }
            }
            return;
#endif // defined(FEATURE_HW_INTRINSICS)

        // Special nodes
        case GT_PHI:
            for (GenTreePhi::Use& use : AsPhi()->Uses())
            {
                if (visitor(use.GetNode()) == VisitResult::Abort)
                {
                    break;
                }
            }
            return;

        case GT_FIELD_LIST:
            for (GenTreeFieldList::Use& field : AsFieldList()->Uses())
            {
                if (visitor(field.GetNode()) == VisitResult::Abort)
                {
                    break;
                }
            }
            return;

        case GT_CMPXCHG:
        {
            GenTreeCmpXchg* const cmpXchg = this->AsCmpXchg();
            if (visitor(cmpXchg->Addr()) == VisitResult::Abort)
            {
                return;
            }
            if (visitor(cmpXchg->Data()) == VisitResult::Abort)
            {
                return;
            }
            visitor(cmpXchg->Comparand());
            return;
        }

        case GT_ARR_ELEM:
        {
            GenTreeArrElem* const arrElem = this->AsArrElem();
            if (visitor(arrElem->gtArrObj) == VisitResult::Abort)
            {
                return;
            }
            for (unsigned i = 0; i < arrElem->gtArrRank; i++)
            {
                if (visitor(arrElem->gtArrInds[i]) == VisitResult::Abort)
                {
                    return;
                }
            }
            return;
        }

        case GT_STORE_DYN_BLK:
        {
            GenTreeStoreDynBlk* const dynBlock = this->AsStoreDynBlk();
            if (visitor(dynBlock->gtOp1) == VisitResult::Abort)
            {
                return;
            }
            if (visitor(dynBlock->gtOp2) == VisitResult::Abort)
            {
                return;
            }
            visitor(dynBlock->gtDynamicSize);
            return;
        }

        case GT_CALL:
        {
            GenTreeCall* const call = this->AsCall();

            for (CallArg& arg : call->gtArgs.EarlyArgs())
            {
                if (visitor(arg.GetEarlyNode()) == VisitResult::Abort)
                {
                    return;
                }
            }

            for (CallArg& arg : call->gtArgs.LateArgs())
            {
                if (visitor(arg.GetLateNode()) == VisitResult::Abort)
                {
                    return;
                }
            }

            if (call->gtCallType == CT_INDIRECT)
            {
                if ((call->gtCallCookie != nullptr) && (visitor(call->gtCallCookie) == VisitResult::Abort))
                {
                    return;
                }
                if ((call->gtCallAddr != nullptr) && (visitor(call->gtCallAddr) == VisitResult::Abort))
                {
                    return;
                }
            }
            if ((call->gtControlExpr != nullptr))
            {
                visitor(call->gtControlExpr);
            }
            return;
        }

        case GT_SELECT:
        {
            GenTreeConditional* const cond = this->AsConditional();
            if (visitor(cond->gtCond) == VisitResult::Abort)
            {
                return;
            }
            if (visitor(cond->gtOp1) == VisitResult::Abort)
            {
                return;
            }
            visitor(cond->gtOp2);
            return;
        }

        // Binary nodes
        default:
            assert(this->OperIsBinary());
            VisitBinOpOperands<TVisitor>(visitor);
            return;
    }
}

template <typename TVisitor>
void GenTree::VisitBinOpOperands(TVisitor visitor)
{
    assert(this->OperIsBinary());

    GenTreeOp* const op = this->AsOp();

    GenTree* const op1 = op->gtOp1;
    if ((op1 != nullptr) && (visitor(op1) == VisitResult::Abort))
    {
        return;
    }

    GenTree* const op2 = op->gtOp2;
    if (op2 != nullptr)
    {
        visitor(op2);
    }
}

/*****************************************************************************
 *  operator new
 *
 *  Note that compiler's allocator is an arena allocator that returns memory that is
 *  not zero-initialized and can contain data from a prior allocation lifetime.
 */

inline void* operator new(size_t sz, Compiler* compiler, CompMemKind cmk)
{
    return compiler->getAllocator(cmk).allocate<char>(sz);
}

inline void* operator new[](size_t sz, Compiler* compiler, CompMemKind cmk)
{
    return compiler->getAllocator(cmk).allocate<char>(sz);
}

/*****************************************************************************/

#ifdef DEBUG

inline void printRegMask(regMaskTP mask)
{
    printf(REG_MASK_ALL_FMT, mask);
}

inline char* regMaskToString(regMaskTP mask, Compiler* context)
{
    const size_t cchRegMask = 24;
    char*        regmask    = new (context, CMK_Unknown) char[cchRegMask];

    sprintf_s(regmask, cchRegMask, REG_MASK_ALL_FMT, mask);

    return regmask;
}

inline void printRegMaskInt(regMaskTP mask)
{
    printf(REG_MASK_INT_FMT, (mask & RBM_ALLINT));
}

inline char* regMaskIntToString(regMaskTP mask, Compiler* context)
{
    const size_t cchRegMask = 24;
    char*        regmask    = new (context, CMK_Unknown) char[cchRegMask];

    sprintf_s(regmask, cchRegMask, REG_MASK_INT_FMT, (mask & RBM_ALLINT));

    return regmask;
}

#endif // DEBUG

inline static bool StructHasOverlappingFields(DWORD attribs)
{
    return ((attribs & CORINFO_FLG_OVERLAPPING_FIELDS) != 0);
}

inline static bool StructHasIndexableFields(DWORD attribs)
{
    return ((attribs & CORINFO_FLG_INDEXABLE_FIELDS) != 0);
}

//------------------------------------------------------------------------------
// DEBUG_DESTROY_NODE: sets value of tree to garbage to catch extra references
//
// Arguments:
//    tree: This node should not be referenced by anyone now
//
inline void DEBUG_DESTROY_NODE(GenTree* tree)
{
#ifdef DEBUG
    // printf("DEBUG_DESTROY_NODE for [0x%08x]\n", tree);

    // Save gtOper in case we want to find out what this node was
    tree->gtOperSave = tree->gtOper;

    tree->gtType = TYP_UNDEF;
    tree->gtFlags |= ~GTF_NODE_MASK;
    if (tree->OperIsSimple())
    {
        tree->AsOp()->gtOp1 = tree->AsOp()->gtOp2 = nullptr;
    }
    // Must do this last, because the "AsOp()" check above will fail otherwise.
    // Don't call SetOper, because GT_COUNT is not a valid value
    tree->gtOper = GT_COUNT;
#endif
}

//------------------------------------------------------------------------------
// DEBUG_DESTROY_NODE: sets value of trees to garbage to catch extra references
//
// Arguments:
//    tree, ...rest: These nodes should not be referenced by anyone now
//
template <typename... T>
void DEBUG_DESTROY_NODE(GenTree* tree, T... rest)
{
    DEBUG_DESTROY_NODE(tree);
    DEBUG_DESTROY_NODE(rest...);
}

//------------------------------------------------------------------------------
// lvRefCnt: access reference count for this local var
//
// Arguments:
//    state: the requestor's expected ref count state; defaults to RCS_NORMAL
//
// Return Value:
//    Ref count for the local.

inline unsigned short LclVarDsc::lvRefCnt(RefCountState state) const
{

#if defined(DEBUG)
    assert(state != RCS_INVALID);
    Compiler* compiler = JitTls::GetCompiler();
    assert(compiler->lvaRefCountState == state);
#endif

    if (lvImplicitlyReferenced && (m_lvRefCnt == 0))
    {
        return 1;
    }

    return m_lvRefCnt;
}

//------------------------------------------------------------------------------
// incLvRefCnt: increment reference count for this local var
//
// Arguments:
//    delta: the amount of the increment
//    state: the requestor's expected ref count state; defaults to RCS_NORMAL
//
// Notes:
//    It is currently the caller's responsibility to ensure this increment
//    will not cause overflow.
//
inline void LclVarDsc::incLvRefCnt(unsigned short delta, RefCountState state)
{
#if defined(DEBUG)
    assert(state != RCS_INVALID);
    Compiler* compiler = JitTls::GetCompiler();
    assert(compiler->lvaRefCountState == state);
#endif

    unsigned short oldRefCnt = m_lvRefCnt;
    m_lvRefCnt += delta;
    assert(m_lvRefCnt >= oldRefCnt);
}

//------------------------------------------------------------------------------
// incLvRefCntSaturating: increment reference count for this local var (with saturating semantics)
//
// Arguments:
//    delta: the amount of the increment
//    state: the requestor's expected ref count state; defaults to RCS_NORMAL
//
inline void LclVarDsc::incLvRefCntSaturating(unsigned short delta, RefCountState state)
{
#if defined(DEBUG)
    assert(state != RCS_INVALID);
    Compiler* compiler = JitTls::GetCompiler();
    assert(compiler->lvaRefCountState == state);
#endif

    int newRefCnt = m_lvRefCnt + delta;
    m_lvRefCnt    = static_cast<unsigned short>(min(USHRT_MAX, newRefCnt));
}

//------------------------------------------------------------------------------
// setLvRefCnt: set the reference count for this local var
//
// Arguments:
//    newValue: the desired new reference count
//    state: the requestor's expected ref count state; defaults to RCS_NORMAL
//
// Notes:
//    Generally after calling v->setLvRefCnt(Y), v->lvRefCnt() == Y.
//    However this may not be true when v->lvImplicitlyReferenced == 1.

inline void LclVarDsc::setLvRefCnt(unsigned short newValue, RefCountState state)
{

#if defined(DEBUG)
    assert(state != RCS_INVALID);
    Compiler* compiler = JitTls::GetCompiler();
    assert(compiler->lvaRefCountState == state);
#endif

    m_lvRefCnt = newValue;
}

//------------------------------------------------------------------------------
// lvRefCntWtd: access weighted reference count for this local var
//
// Arguments:
//    state: the requestor's expected ref count state; defaults to RCS_NORMAL
//
// Return Value:
//    Weighted ref count for the local.

inline weight_t LclVarDsc::lvRefCntWtd(RefCountState state) const
{

#if defined(DEBUG)
    assert(state != RCS_INVALID);
    Compiler* compiler = JitTls::GetCompiler();
    assert(compiler->lvaRefCountState == state);
#endif

    if (lvImplicitlyReferenced && (m_lvRefCntWtd == 0))
    {
        return BB_UNITY_WEIGHT;
    }

    return m_lvRefCntWtd;
}

//------------------------------------------------------------------------------
// incLvRefCntWtd: increment weighted reference count for this local var
//
// Arguments:
//    delta: the amount of the increment
//    state: the requestor's expected ref count state; defaults to RCS_NORMAL
//
// Notes:
//    It is currently the caller's responsibility to ensure this increment
//    will not cause overflow.

inline void LclVarDsc::incLvRefCntWtd(weight_t delta, RefCountState state)
{

#if defined(DEBUG)
    assert(state != RCS_INVALID);
    Compiler* compiler = JitTls::GetCompiler();
    assert(compiler->lvaRefCountState == state);
#endif

    weight_t oldRefCntWtd = m_lvRefCntWtd;
    m_lvRefCntWtd += delta;
    assert(m_lvRefCntWtd >= oldRefCntWtd);
}

//------------------------------------------------------------------------------
// setLvRefCntWtd: set the weighted reference count for this local var
//
// Arguments:
//    newValue: the desired new weighted reference count
//    state: the requestor's expected ref count state; defaults to RCS_NORMAL
//
// Notes:
//    Generally after calling v->setLvRefCntWtd(Y), v->lvRefCntWtd() == Y.
//    However this may not be true when v->lvImplicitlyReferenced == 1.

inline void LclVarDsc::setLvRefCntWtd(weight_t newValue, RefCountState state)
{

#if defined(DEBUG)
    assert(state != RCS_INVALID);
    Compiler* compiler = JitTls::GetCompiler();
    assert(compiler->lvaRefCountState == state);
#endif

    m_lvRefCntWtd = newValue;
}

//------------------------------------------------------------------------------
// compCanHavePatchpoints: return true if patchpoints are supported in this
//   method.
//
// Arguments:
//    reason - [out, optional] reason why patchpoints are not supported
//
// Returns:
//    True if patchpoints are supported in this method.
//
inline bool Compiler::compCanHavePatchpoints(const char** reason)
{
    const char* whyNot = nullptr;

#ifdef FEATURE_ON_STACK_REPLACEMENT
    if (compLocallocSeen)
    {
        whyNot = "OSR can't handle localloc";
    }
    else if (compHasBackwardJumpInHandler)
    {
        whyNot = "OSR can't handle loop in handler";
    }
    else if (opts.IsReversePInvoke())
    {
        whyNot = "OSR can't handle reverse pinvoke";
    }
    else if (!info.compIsStatic && !lvaIsOriginalThisReadOnly())
    {
        whyNot = "OSR can't handle modifiable this";
    }
#else
    whyNot = "OSR feature not defined in build";
#endif

    if (reason != nullptr)
    {
        *reason = whyNot;
    }

    return whyNot == nullptr;
}

//------------------------------------------------------------------------
// fgRunDfs: Run DFS over the flow graph.
//
// Type parameters:
//   VisitPreorder  - Functor type that takes a BasicBlock* and its preorder number
//   VisitPostorder - Functor type that takes a BasicBlock* and its postorder number
//   VisitEdge      - Functor type that takes two BasicBlock*.
//
// Parameters:
//   visitPreorder  - Functor to visit block in its preorder
//   visitPostorder - Functor to visit block in its postorder
//   visitEdge      - Functor to visit an edge. Called after visitPreorder (if
//                    this is the first time the successor is seen).
//
// Returns:
//   Number of blocks visited.
//
template <typename VisitPreorder, typename VisitPostorder, typename VisitEdge>
unsigned Compiler::fgRunDfs(VisitPreorder visitPreorder, VisitPostorder visitPostorder, VisitEdge visitEdge)
{
    BitVecTraits traits(fgBBNumMax + 1, this);
    BitVec       visited(BitVecOps::MakeEmpty(&traits));

    unsigned preOrderIndex  = 0;
    unsigned postOrderIndex = 0;

    ArrayStack<AllSuccessorEnumerator> blocks(getAllocator(CMK_DepthFirstSearch));

    auto dfsFrom = [&](BasicBlock* firstBB) {

        BitVecOps::AddElemD(&traits, visited, firstBB->bbNum);
        blocks.Emplace(this, firstBB);
        visitPreorder(firstBB, preOrderIndex++);

        while (!blocks.Empty())
        {
            BasicBlock* block = blocks.TopRef().Block();
            BasicBlock* succ  = blocks.TopRef().NextSuccessor();

            if (succ != nullptr)
            {
                if (BitVecOps::TryAddElemD(&traits, visited, succ->bbNum))
                {
                    blocks.Emplace(this, succ);
                    visitPreorder(succ, preOrderIndex++);
                }

                visitEdge(block, succ);
            }
            else
            {
                blocks.Pop();
                visitPostorder(block, postOrderIndex++);
            }
        }

    };

    dfsFrom(fgFirstBB);

    if ((fgEntryBB != nullptr) && !BitVecOps::IsMember(&traits, visited, fgEntryBB->bbNum))
    {
        // OSR methods will early on create flow that looks like it goes to the
        // patchpoint, but during morph we may transform to something that
        // requires the original entry (fgEntryBB).
        assert(opts.IsOSR());
        dfsFrom(fgEntryBB);
    }

    if ((genReturnBB != nullptr) && !BitVecOps::IsMember(&traits, visited, genReturnBB->bbNum))
    {
        assert(!fgGlobalMorphDone);
        // We introduce the merged return BB before morph and will redirect
        // other returns to it as part of morph; keep it reachable.
        dfsFrom(genReturnBB);
    }

    assert(preOrderIndex == postOrderIndex);
    return preOrderIndex;
}

//------------------------------------------------------------------------------
// FlowGraphNaturalLoop::VisitLoopBlocksReversePostOrder: Visit all of the
// loop's blocks in reverse post order.
//
// Type parameters:
//   TFunc - Callback functor type
//
// Arguments:
//   func - Callback functor that takes a BasicBlock* and returns a
//   BasicBlockVisit.
//
// Returns:
//    BasicBlockVisit that indicated whether the visit was aborted by the
//    callback or whether all blocks were visited.
//
template <typename TFunc>
BasicBlockVisit FlowGraphNaturalLoop::VisitLoopBlocksReversePostOrder(TFunc func)
{
    BitVecTraits traits(m_blocksSize, m_dfsTree->GetCompiler());
    bool result = BitVecOps::VisitBits(&traits, m_blocks, [=](unsigned index) {
        // head block rpo index = PostOrderCount - 1 - headPreOrderIndex
        // loop block rpo index = head block rpoIndex + index
        // loop block po index = PostOrderCount - 1 - loop block rpo index
        //                     = headPreOrderIndex - index
        unsigned poIndex = m_header->bbPostorderNum - index;
        assert(poIndex < m_dfsTree->GetPostOrderCount());
        return func(m_dfsTree->GetPostOrder(poIndex)) == BasicBlockVisit::Continue;
    });

    return result ? BasicBlockVisit::Continue : BasicBlockVisit::Abort;
}

//------------------------------------------------------------------------------
// FlowGraphNaturalLoop::VisitLoopBlocksPostOrder: Visit all of the loop's
// blocks in post order.
//
// Type parameters:
//   TFunc - Callback functor type
//
// Arguments:
//   func - Callback functor that takes a BasicBlock* and returns a
//   BasicBlockVisit.
//
// Returns:
//    BasicBlockVisit that indicated whether the visit was aborted by the
//    callback or whether all blocks were visited.
//
template <typename TFunc>
BasicBlockVisit FlowGraphNaturalLoop::VisitLoopBlocksPostOrder(TFunc func)
{
    BitVecTraits traits(m_blocksSize, m_dfsTree->GetCompiler());
    bool result = BitVecOps::VisitBitsReverse(&traits, m_blocks, [=](unsigned index) {
        unsigned poIndex = m_header->bbPostorderNum - index;
        assert(poIndex < m_dfsTree->GetPostOrderCount());
        return func(m_dfsTree->GetPostOrder(poIndex)) == BasicBlockVisit::Continue;
    });

    return result ? BasicBlockVisit::Continue : BasicBlockVisit::Abort;
}

//------------------------------------------------------------------------------
// FlowGraphNaturalLoop::VisitLoopBlocks: Visit all of the loop's blocks.
//
// Type parameters:
//   TFunc - Callback functor type
//
// Arguments:
//   func - Callback functor that takes a BasicBlock* and returns a
//   BasicBlockVisit.
//
// Returns:
//    BasicBlockVisit that indicated whether the visit was aborted by the
//    callback or whether all blocks were visited.
//
template <typename TFunc>
BasicBlockVisit FlowGraphNaturalLoop::VisitLoopBlocks(TFunc func)
{
    return VisitLoopBlocksReversePostOrder(func);
}

//------------------------------------------------------------------------------
// FlowGraphNaturalLoop::VisitLoopBlocksLexical: Visit the loop's blocks in
// lexical order.
//
// Type parameters:
//   TFunc - Callback functor type
//
// Arguments:
//   func - Callback functor that takes a BasicBlock* and returns a
//   BasicBlockVisit.
//
// Returns:
//    BasicBlockVisit that indicated whether the visit was aborted by the
//    callback or whether all blocks were visited.
//
template <typename TFunc>
BasicBlockVisit FlowGraphNaturalLoop::VisitLoopBlocksLexical(TFunc func)
{
    BasicBlock* top           = m_header;
    unsigned    numLoopBlocks = 0;
    VisitLoopBlocks([&](BasicBlock* block) {
        if (block->bbNum < top->bbNum)
        {
            top = block;
        }

        numLoopBlocks++;
        return BasicBlockVisit::Continue;
    });

    INDEBUG(BasicBlock* prev = nullptr);
    BasicBlock* cur = top;
    while (numLoopBlocks > 0)
    {
        // If we run out of blocks the blocks aren't sequential.
        assert(cur != nullptr);

        if (ContainsBlock(cur))
        {
            assert((prev == nullptr) || (prev->bbNum < cur->bbNum));

            if (func(cur) == BasicBlockVisit::Abort)
                return BasicBlockVisit::Abort;

            INDEBUG(prev = cur);
            numLoopBlocks--;
        }

        cur = cur->Next();
    }

    return BasicBlockVisit::Continue;
}

/*****************************************************************************/
#endif //_COMPILER_HPP_
/*****************************************************************************/