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OMRSimplifierHandlers.cpp
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/*******************************************************************************
* Copyright IBM Corp. and others 2000
*
* This program and the accompanying materials are made available under
* the terms of the Eclipse Public License 2.0 which accompanies this
* distribution and is available at https://www.eclipse.org/legal/epl-2.0/
* or the Apache License, Version 2.0 which accompanies this distribution
* and is available at https://www.apache.org/licenses/LICENSE-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License, v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception [1] and GNU General Public
* License, version 2 with the OpenJDK Assembly Exception [2].
*
* [1] https://www.gnu.org/software/classpath/license.html
* [2] https://openjdk.org/legal/assembly-exception.html
*
* SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 OR GPL-2.0-only WITH Classpath-exception-2.0 OR GPL-2.0-only WITH OpenJDK-assembly-exception-1.0
*******************************************************************************/
#ifndef OMR_SIMPLIFIERHANDLERS_INCL
#define OMR_SIMPLIFIERHANDLERS_INCL
#include "optimizer/OMRSimplifierHelpers.hpp"
#include "optimizer/SimplifierHandlers.hpp"
#include <limits.h>
#include <math.h>
#include "compile/Compilation.hpp"
#include "codegen/CodeGenerator.hpp"
#include "codegen/TreeEvaluator.hpp"
#include "env/CompilerEnv.hpp"
#include "env/IO.hpp"
#include "env/jittypes.h"
#include "il/AliasSetInterface.hpp"
#include "il/Block.hpp"
#include "il/DataTypes.hpp"
#include "il/ILOpCodes.hpp"
#include "il/LabelSymbol.hpp"
#include "il/Node.hpp"
#include "il/Node_inlines.hpp"
#include "il/StaticSymbol.hpp"
#include "il/SymbolReference.hpp"
#include "il/TreeTop.hpp"
#include "il/TreeTop_inlines.hpp"
#include "infra/Arith.hpp"
#include "infra/Bit.hpp"
#include "infra/BitVector.hpp"
#include "infra/Cfg.hpp"
#include "infra/SimpleRegex.hpp"
#include "optimizer/Optimization_inlines.hpp"
#include "optimizer/Optimizer.hpp"
#include "optimizer/Simplifier.hpp"
#include "optimizer/Structure.hpp"
#include "optimizer/UseDefInfo.hpp"
#include "optimizer/ValueNumberInfo.hpp"
#include "optimizer/TransformUtil.hpp"
#define OP_PLUS 0
#define OP_MINUS 1
#define CLEARBIT32 0x7FFFFFFF
#define TR_MAX_PADDING 256
#define TR_MAX_LENGTH_FOR_UNEVEN_LENGTHS 16
#define TR_SPACE_CHAR 0x40
#define TR_MAX_PADDING_SIZE 16000
#define TR_PDPOWER_POSITIVE_INLINE_THRESHOLD 32
#define TR_PDPOWER_NEGATIVE_INLINE_THRESHOLD -32
#define TR_MAX_OCONST_FOLDING_SIZE 256
#define TR_MAX_ARRAYSET_EXPANSION_LEN 256
#define FMA_CONST_LOWBOUND 5.915260931E-272
#define FMA_CONST_HIGHBOUNDI2D 8.371160993643E298
#define FMA_CONST_HIGHBOUNDF2D 5.282945626245E269
/**
* If both sides of a branch are adds, simplify to use atmost one add
* e.g. if (a + b != x + y) where b and y are constants, would be simplified
* to if (a != x + (y - b))
*
* This cannot be applied when the comparison operator is a <, <=, >, >=
* in general. That _may_ be possible when more information about the value
* ranges is known (i.e. during value propagation)
*/
#define SIMPLIFY_BRANCH_ARITHMETIC(Type,Width) \
if ((firstChild ->getOpCode().isSub() || firstChild ->getOpCode().isAdd()) && \
(firstChild ->getSecondChild()->getOpCode().isLoadConst()) && \
(secondChild->getOpCode().isSub() || secondChild->getOpCode().isAdd()) && \
(secondChild->getSecondChild()->getOpCode().isLoadConst()) && \
(firstChild ->getReferenceCount()==1) && \
(secondChild ->getReferenceCount()==1)) \
{ \
Width konst; \
if (firstChild->getOpCode().isSub()) \
{ \
if (secondChild->getOpCode().isSub()) \
konst = secondChild->getSecondChild()->get##Type() - \
firstChild->getSecondChild()->get##Type(); \
else \
konst = secondChild->getSecondChild()->get##Type() + \
firstChild->getSecondChild()->get##Type(); \
} \
else \
{ \
if (secondChild->getOpCode().isAdd()) \
konst = secondChild->getSecondChild()->get##Type() - \
firstChild->getSecondChild()->get##Type(); \
else \
konst = secondChild->getSecondChild()->get##Type() + \
firstChild->getSecondChild()->get##Type(); \
} \
node->setAndIncChild(0, firstChild->getFirstChild()); \
firstChild->recursivelyDecReferenceCount(); \
firstChild = firstChild->getFirstChild(); \
if (konst == 0) \
{ \
node->setAndIncChild(1, secondChild->getFirstChild()); \
secondChild->recursivelyDecReferenceCount(); \
secondChild = secondChild->getFirstChild(); \
} \
else \
{ \
TR::Node * grandChild = secondChild->getSecondChild(); \
if (grandChild->getReferenceCount() == 1) \
grandChild->set##Type(konst); \
else \
{ \
grandChild->recursivelyDecReferenceCount(); \
secondChild->setAndIncChild(1, TR::Node::create(grandChild, grandChild->getOpCodeValue(), 0, (int32_t)konst)); \
} \
} \
dumpOptDetails(s->comp(), "%ssimplified arithmetic in branch [" POINTER_PRINTF_FORMAT "]\n", s->optDetailString(), \
node); \
}
struct BinaryOpSimplifierHelpers
{
static int8_t getNodeByteValue(TR::Node * node)
{
return node->getByte();
}
static int16_t getNodeShortValue(TR::Node * node)
{
return node->getShortInt();
}
static int32_t getNodeIntValue(TR::Node * node)
{
return node->getInt();
}
static int64_t getNodeLongValue(TR::Node * node)
{
return node->getLongInt();
}
static uint32_t getNodeFloatBits(TR::Node * node)
{
return node->getFloatBits();
}
static uint64_t getNodeDoubleBits(TR::Node * node)
{
return node->getDoubleBits();
}
static void setNodeByteValue(TR::Node * node, int8_t value)
{
node->setByte(value);
}
static void setNodeShortValue(TR::Node * node, int16_t value)
{
node->setShortInt(value);
}
static void setNodeIntValue(TR::Node * node, int32_t value)
{
node->setInt(value);
}
static void setNodeLongValue(TR::Node * node, int64_t value)
{
node->setLongInt(value);
}
static void setNodeFloatBits(TR::Node * node, uint32_t bits)
{
node->setFloatBits(bits);
}
static void setNodeDoubleBits(TR::Node * node, uint64_t bits)
{
node->setDoubleBits(bits);
}
};
template <typename T>
struct BinaryOpSimplifier
{
typedef T (* Getter)(TR::Node *);
typedef void (* Setter)(TR::Node *, T);
TR::Simplifier * s;
Getter getNodeValue;
Setter setNodeValue;
BinaryOpSimplifier(TR::Simplifier * simplifier, Getter getter, Setter setter): s(simplifier), getNodeValue(getter), setNodeValue(setter) {}
/**
* Binary identity operation
*
* If the second child is a constant that represents an identity operand
* for the operation, replace this node with the first child.
*/
inline TR::Node * tryToSimplifyIdentityOp(TR::Node * node, T identityValue)
{
auto secondChild = node->getSecondChild();
if (!secondChild || !secondChild->getOpCode().isLoadConst())
return NULL;
if (getNodeValue(secondChild) != identityValue)
return NULL;
return s->replaceNode(node, node->getFirstChild(), s->_curTree);
}
/**
* Binary identity or zero operation
*
* If the second child is a constant that represents an identity operand
* for the operation, replace this node with the first child.
* Binary zero operation
*
* If the second child is a constant that represents a zero operation,
* replace this node with the second child.
*/
inline TR::Node * tryToSimplifyIdentityOrZeroOp(TR::Block * block, TR::Node * node, T identityValue, T zeroValue)
{
auto secondChild = node->getSecondChild();
if (!secondChild || !secondChild->getOpCode().isLoadConst())
return NULL;
auto value = getNodeValue(secondChild);
if (value == identityValue)
return s->replaceNodeWithChild(node, node->getFirstChild(), s->_curTree, block);
if (value != zeroValue)
return NULL;
if (performTransformation(s->comp(), "%sFound op with %s in node [" POINTER_PRINTF_FORMAT "]\n", s->optDetailString(), node->getOpCode().getName(), node))
{
s->anchorChildren(node, s->_curTree);
s->prepareToReplaceNode(node, secondChild->getOpCodeValue());
setNodeValue(node, value);
return node;
}
return NULL;
}
};
BinaryOpSimplifier<int8_t> getByteBinaryOpSimplifier(TR::Simplifier * s)
{
return BinaryOpSimplifier<int8_t>(s, BinaryOpSimplifierHelpers::getNodeByteValue, BinaryOpSimplifierHelpers::setNodeByteValue);
}
BinaryOpSimplifier<int16_t> getShortBinaryOpSimplifier(TR::Simplifier * s)
{
return BinaryOpSimplifier<int16_t>(s, BinaryOpSimplifierHelpers::getNodeShortValue, BinaryOpSimplifierHelpers::setNodeShortValue);
}
BinaryOpSimplifier<int32_t> getIntBinaryOpSimplifier(TR::Simplifier * s)
{
return BinaryOpSimplifier<int32_t>(s, BinaryOpSimplifierHelpers::getNodeIntValue, BinaryOpSimplifierHelpers::setNodeIntValue);
}
BinaryOpSimplifier<int64_t> getLongBinaryOpSimplifier(TR::Simplifier * s)
{
return BinaryOpSimplifier<int64_t>(s, BinaryOpSimplifierHelpers::getNodeLongValue, BinaryOpSimplifierHelpers::setNodeLongValue);
}
BinaryOpSimplifier<uint32_t> getFloatBitsBinaryOpSimplifier(TR::Simplifier * s)
{
return BinaryOpSimplifier<uint32_t>(s, BinaryOpSimplifierHelpers::getNodeFloatBits, BinaryOpSimplifierHelpers::setNodeFloatBits);
}
BinaryOpSimplifier<uint64_t> getDoubleBitsBinaryOpSimplifier(TR::Simplifier * s)
{
return BinaryOpSimplifier<uint64_t>(s, BinaryOpSimplifierHelpers::getNodeDoubleBits, BinaryOpSimplifierHelpers::setNodeDoubleBits);
}
static TR::ILOpCodes addOps[TR::NumAllTypes] = { TR::BadILOp,
TR::badd, TR::sadd, TR::iadd, TR::ladd,
TR::fadd, TR::dadd,
TR::BadILOp, TR::BadILOp, TR::BadILOp,
TR::BadILOp, TR::BadILOp, TR::BadILOp};
static TR::ILOpCodes subOps[TR::NumAllTypes] = { TR::BadILOp,
TR::bsub, TR::ssub, TR::isub, TR::lsub,
TR::fsub, TR::dsub,
TR::asub, TR::BadILOp, TR::BadILOp,
TR::BadILOp, TR::BadILOp, TR::BadILOp};
static TR::ILOpCodes constOps[TR::NumAllTypes] = { TR::BadILOp,
TR::bconst, TR::sconst, TR::iconst, TR::lconst,
TR::fconst, TR::dconst,
TR::aconst, TR::BadILOp, TR::BadILOp,
TR::BadILOp, TR::BadILOp, TR::BadILOp};
static TR::ILOpCodes negOps[TR::NumAllTypes] = { TR::BadILOp,
TR::bneg, TR::sneg, TR::ineg, TR::lneg,
TR::fneg, TR::dneg,
TR::BadILOp, TR::BadILOp, TR::BadILOp,
TR::BadILOp, TR::BadILOp, TR::BadILOp};
/*
* Local helper functions
*/
static void convertToTestUnderMask(TR::Node *node, TR::Block *block, TR::Simplifier *s)
{
// butest evaluator is only implemented on Z
if (!s->comp()->target().cpu.isZ())
return;
if (debug("disableConvertToTestUnderMask"))
return;
auto cm = s->comp();
/*
* ificmpeq ificmpeq
* iand butest
* iushr bloadi x
* iloadi x aload
* aload bconst 1
* iconst 24 iconst 0
* iconst 1
* iconst 0
*/
TR::Node *iand, *iushr, *load;
int32_t constVal;
if ((iand = node->getChild(0))->getOpCodeValue() == TR::iand &&
node->getChild(1)->getOpCode().isLoadConst() &&
(constVal = node->getChild(1)->getConst<int32_t>()) == 0 &&
(iushr = iand->getChild(0))->getOpCodeValue() == TR::iushr &&
iand->getChild(1)->getOpCode().isLoadConst() &&
(constVal = iand->getChild(1)->getConst<int32_t>()) >= TR::getMinSigned<TR::Int8>() && constVal <= TR::getMaxSigned<TR::Int8>() &&
(load = iushr->getChild(0))->getOpCode().isLoadVar() &&
iushr->getChild(1)->getOpCode().isLoadConst() &&
(constVal = iushr->getChild(1)->getConst<int32_t>()) == 24 &&
!load->getSymbol()->isParm() && load->getOpCode().isLoadIndirect() && // Limit it to non-parm, indirect cases
load->getReferenceCount() == 1 &&
performTransformation(cm, "%sTransforming iand/iushr to byte test under mask ["
POINTER_PRINTF_FORMAT "]\n", s->optDetailString(), node))
{
// anchor iand subtree
auto anchor = TR::TreeTop::create(s->comp(), TR::Node::create(TR::treetop, 1, iand));
s->_curTree->insertBefore(anchor);
auto bloadi = TR::Node::createWithSymRef(TR::bloadi, 1, load->getChild(0), 0, load->getSymbolReference());
node->setAndIncChild(0, TR::Node::create(TR::butest, 2, bloadi,
TR::Node::bconst(iand->getChild(1)->getConst<int8_t>())));
iand->recursivelyDecReferenceCount();
}
}
static bool isBitwiseIntComplement(TR::Node * n)
{
if (n->getOpCodeValue() == TR::ixor)
{
TR::Node * secondChild = n->getSecondChild();
if (secondChild->getOpCodeValue() == TR::iconst &&
secondChild->getInt() == -1)
{
return true;
}
}
return false;
}
static void setExprInvariant(TR_RegionStructure *region, TR::Node *node)
{
if (region && region->getInvariantExpressions())
{
region->setExprInvariant(node);
}
}
template <typename T>
inline void foldConstant(TR::Node *node, T value, TR::Simplifier *s, bool anchorChildrenP)
{
if (!performTransformationSimplifier(node, s)) return;
if (anchorChildrenP) s->anchorChildren(node, s->_curTree);
s->prepareToReplaceNode(node, TR::ILOpCode::getConstOpCode<T>());
node->setConst<T>(value);
dumpOptDetails(s->comp(), " to %s %lld\n", node->getOpCode().getName(), value);
}
template <typename T>
static TR::Node *binaryIdentityOp(TR::Node *node, T nil, TR::Simplifier *s)
{
TR::Node *secondChild = node->getSecondChild();
if (secondChild->getOpCode().isLoadConst() &&
secondChild->getConst<T>() == nil)
{
return s->replaceNode(node, node->getFirstChild(), s->_curTree);
}
return 0;
}
static bool isIMulComposerOpCode(TR::Node * node)
{
TR::ILOpCodes childOp = node->getOpCodeValue();
if (childOp == TR::iadd || childOp == TR::isub || childOp == TR::imul || childOp == TR::ineg)
return true;
return false;
}
bool imulComposer(TR::Node * node, int *value, TR::Node ** multiplier )
{
TR::Node * firstChild;
TR::Node * secondChild;
TR::Node * lMultiplier = NULL;
TR::Node * rMultiplier = NULL;
int lcount = 0;
int rcount = 0;
*multiplier = NULL;
*value = 0;
if (node->getOpCodeValue() == TR::iadd || node->getOpCodeValue() == TR::isub)
{
bool rAnswer = false, lAnswer = false;
firstChild = node->getFirstChild();
secondChild = node->getSecondChild();
if (isIMulComposerOpCode(firstChild))
{
if (firstChild->getReferenceCount() > 1) return false;
lAnswer = imulComposer(firstChild, &lcount, &lMultiplier);
if (!lAnswer)
return false;
}
else
{
lMultiplier = firstChild;
lcount = 1;
}
if (isIMulComposerOpCode(secondChild))
{
if (secondChild->getReferenceCount() > 1) return false;
rAnswer = imulComposer(secondChild, &rcount, &rMultiplier);
if (!rAnswer)
return false;
}
else
{
rMultiplier = secondChild;
rcount = 1;
}
if (lMultiplier != rMultiplier)
return false;
if (!lAnswer && !rAnswer)
return false;
*multiplier = lMultiplier;
if (node->getOpCodeValue() == TR::isub)
*value = lcount - rcount;
else
*value = lcount + rcount;
return true;
}
else if (node->getOpCodeValue() == TR::imul)
{
firstChild = node->getFirstChild();
secondChild = node->getSecondChild();
if (secondChild->getOpCodeValue() == TR::iconst && isNonNegativePowerOf2(secondChild->getInt()))
{
*multiplier = firstChild;
*value = secondChild->getInt();
return true;
}
}
else if (node->getOpCodeValue() == TR::ineg)
{
bool lAnswer = false;
firstChild = node->getFirstChild();
if (isIMulComposerOpCode(firstChild))
{
if (firstChild->getReferenceCount() > 1) return false;
lAnswer = imulComposer(firstChild, &lcount, &lMultiplier);
if (!lAnswer)
return false;
}
else
{
lMultiplier = firstChild;
lcount = 1;
}
*value = -lcount;
*multiplier = lMultiplier;
return true;
}
return false;
}
static bool isSmallConstant(TR::Node *node, TR::Simplifier *s)
{
if (node->getOpCode().isLoadConst() &&
!s->comp()->cg()->isMaterialized(node))
return true;
return false;
}
static void reassociateBigConstants(TR::Node *node, TR::Simplifier *s)
{
if (s->reassociate() &&
(node->getOpCode().isAdd() || node->getOpCode().isSub()) &&
node->getFirstChild()->getReferenceCount() > 1 &&
node->getSecondChild()->getOpCode().isLoadConst() &&
s->comp()->cg()->isMaterialized(node->getSecondChild()))
{
TR_HashId index;
if (!s->_hashTable.locate(node->getFirstChild()->getGlobalIndex(), index))
{
s->_hashTable.add(node->getFirstChild()->getGlobalIndex(), index, node);
}
else
{
TR::Node *base_node = (TR::Node *) s->_hashTable.getData(index);
if (base_node != node &&
base_node->getReferenceCount() >= 1 &&
(base_node->getOpCodeValue() == node->getOpCodeValue()) &&
base_node->getFirstChild() == node->getFirstChild() &&
// need to double check in case base_node has changed
base_node->getSecondChild()->getOpCode().isLoadConst() &&
s->comp()->cg()->isMaterialized(base_node->getSecondChild()))
{
int64_t diff = node->getSecondChild()->get64bitIntegralValue() -
base_node->getSecondChild()->get64bitIntegralValue();
if (!s->comp()->cg()->shouldValueBeInACommonedNode(diff) &&
performTransformation(s->comp(), "%sReusing big constant from node 0x%p in node 0x%p\n", s->optDetailString(), base_node, node))
{
node->getFirstChild()->recursivelyDecReferenceCount();
node->getSecondChild()->recursivelyDecReferenceCount();
TR::Node * diff_node = TR::Node::create(node,
node->getSecondChild()->getOpCodeValue(), 0);
diff_node->set64bitIntegralValue(diff);
node->setAndIncChild (0, base_node);
node->setAndIncChild (1, diff_node);
}
}
}
}
}
static TR::Node *addSimplifierCommon(TR::Node* node, TR::Block * block, TR::Simplifier* s)
{
TR::Node* firstChild, *secondChild;
if ((s->comp()->cg()->supportsLengthMinusOneForMemoryOpts() &&
(s->_curTree->getNode()->getNumChildren() > 0) &&
s->_curTree->getNode()->getFirstChild()->getOpCode().isMemToMemOp()) &&
(s->_curTree->getNode()->getFirstChild()->getLastChild() == node))
return node;
//
// a*add a*add
// / \ / \
// a*add t2 => a*add c1
// / \ / \
// t1 c1 t1 t2
if (s->reassociate() &&
node->getOpCode().isArrayRef())
{
firstChild = node->getFirstChild();
secondChild = node->getSecondChild();
if (firstChild->getOpCodeValue() == node->getOpCodeValue() &&
firstChild->getSecondChild()->getOpCode().isLoadConst() &&
!s->comp()->cg()->isMaterialized(firstChild->getSecondChild()))
{
if (performTransformation(s->comp(), "%sReordering constant terms in node 0x%p\n", s->optDetailString(), node))
{
TR::Node * newFirstChild = TR::Node::create(firstChild, node->getOpCodeValue(), 2);
newFirstChild->setAndIncChild(0, firstChild->getFirstChild());
newFirstChild->setAndIncChild(1, secondChild);
newFirstChild->setIsInternalPointer(firstChild->isInternalPointer());
node->setAndIncChild(0, newFirstChild);
node->setAndIncChild(1, firstChild->getSecondChild());
firstChild->recursivelyDecReferenceCount();
secondChild->recursivelyDecReferenceCount();
}
}
}
TR_RegionStructure * region = s->containingStructure();
if (s->reassociate() &&
node->getOpCode().isAdd())
{
firstChild = node->getFirstChild();
secondChild = node->getSecondChild();
// R9: + +
// / \ / \
// +- c2 => t +-
// / \ / \
// t c1 c2 c1
if ((firstChild->getOpCode().isAdd() ||
firstChild->getOpCode().isSub()) &&
((!isExprInvariant(region, firstChild->getFirstChild()) &&
isExprInvariant(region, firstChild->getSecondChild()) &&
isExprInvariant(region, secondChild)) ||
(!firstChild->getFirstChild()->getOpCode().isLoadConst() &&
firstChild->getSecondChild()->getOpCode().isLoadConst() &&
secondChild->getOpCode().isLoadConst())) &&
!(firstChild->getReferenceCount() > 1 &&
secondChild->getOpCode().isLoadConst() &&
!s->comp()->cg()->isMaterialized(secondChild))
)
{
if (performTransformation(s->comp(), "%sApplied reassociation rule 9 to node 0x%p\n", s->optDetailString(), node))
{
TR::Node * newSecondChild = TR::Node::create(secondChild,
firstChild->getOpCode().isAdd() ?
addOps[secondChild->getDataType()] :
subOps[secondChild->getDataType()], 2);
TR::Node * c1 = firstChild->getSecondChild();
if (c1->getDataType() !=
secondChild->getDataType())
{
TR::ILOpCodes conversionOpCode = TR::ILOpCode::getProperConversion(c1->getDataType(), secondChild->getDataType(), false /* !wantZeroExtension */);
c1 = TR::Node::create(conversionOpCode, 1, c1);
}
newSecondChild->setAndIncChild(0, secondChild);
newSecondChild->setAndIncChild(1, c1);
node->setAndIncChild(0, firstChild->getFirstChild());
node->setAndIncChild(1, newSecondChild);
firstChild->recursivelyDecReferenceCount();
secondChild->recursivelyDecReferenceCount();
setExprInvariant(region, newSecondChild);
node->setVisitCount(0);
node = s->simplify(node, block);
}
}
// R9_1:
// + +
// / \ / \
// c1 + => + t
// / \ / \
// t c2 c1 c2
else if (isExprInvariant(region, firstChild) &&
secondChild->getOpCode().isAdd() &&
!isExprInvariant(region, secondChild->getFirstChild()) &&
isExprInvariant(region, secondChild->getSecondChild()) &&
!isSmallConstant(secondChild->getSecondChild(), s))
{
if (performTransformation(s->comp(), "%sApplied reassociation rule 9_1 to node 0x%p\n", s->optDetailString(), node))
{
TR::Node * newFirstChild = TR::Node::create(firstChild, node->getOpCodeValue(), 2);
newFirstChild->setAndIncChild(0, firstChild);
newFirstChild->setAndIncChild(1, secondChild->getSecondChild());
node->setAndIncChild(0, newFirstChild);
node->setAndIncChild(1, secondChild->getFirstChild());
firstChild->recursivelyDecReferenceCount();
secondChild->recursivelyDecReferenceCount();
setExprInvariant(region, newFirstChild);
}
}
// R9_1_1:
// + +
// / \ / \
// + t2 => c +
// / \ / \
// c t1 t1 t2
else if (firstChild->getOpCode().isAdd() &&
isExprInvariant(region, firstChild->getFirstChild()) &&
!isExprInvariant(region, firstChild->getSecondChild()) &&
(!isExprInvariant(region, secondChild) ||
(node->getOpCode().isArrayRef() && isSmallConstant(secondChild, s))) &&
firstChild->getSecondChild()->getDataType() == secondChild->getDataType())
{
if (performTransformation(s->comp(), "%sApplied reassociation rule 9_1_1 to node 0x%p\n", s->optDetailString(), node))
{
TR::Node * newSecondChild = TR::Node::create(secondChild, addOps[secondChild->getDataType()], 2);
newSecondChild->setAndIncChild(0, firstChild->getSecondChild());
newSecondChild->setAndIncChild(1, secondChild);
node->setAndIncChild(0, firstChild->getFirstChild());
node->setAndIncChild(1, newSecondChild);
firstChild->recursivelyDecReferenceCount();
secondChild->recursivelyDecReferenceCount();
}
}
// R9_1_2:
// + -
// / \ / \
// - c2 => + t
// / \ / \
// c1 t c1 c2
else if (firstChild->getOpCode().isSub() &&
firstChild->getFirstChild()->getOpCode().isLoadConst() &&
secondChild->getOpCode().isLoadConst() &&
firstChild->getFirstChild()->getDataType() == secondChild->getDataType())
{
if (performTransformation(s->comp(), "%sApplied reassociation rule 9_1_2 to node 0x%p\n", s->optDetailString(), node))
{
TR::Node * newFirstChild = TR::Node::create(firstChild, node->getOpCodeValue(), 2);
newFirstChild->setAndIncChild(0, firstChild->getFirstChild());
newFirstChild->setAndIncChild(1, secondChild);
node->setAndIncChild(0, newFirstChild);
node->setAndIncChild(1, firstChild->getSecondChild());
TR::Node::recreate(node, subOps[node->getDataType()]);
firstChild->recursivelyDecReferenceCount();
secondChild->recursivelyDecReferenceCount();
setExprInvariant(region, newFirstChild);
}
}
// R9_1_3:
// + + + -
// / \ / \ / \ / \
// + + => + + - - => + +
// / \ / \ / \ / \ / \ / \ / \ / \
// t1 c1 t2 c2 t1 t2 c1 c2 t1 c1 t2 c2 t1 t2 c1 c2
else if (!node->getOpCode().isRef() &&
firstChild->getOpCodeValue() == secondChild->getOpCodeValue() &&
(firstChild->getOpCode().isAdd() || firstChild->getOpCode().isSub()) &&
!isExprInvariant(region, firstChild->getFirstChild()) &&
!isExprInvariant(region, secondChild->getFirstChild()) &&
isExprInvariant(region, firstChild->getSecondChild()) &&
isExprInvariant(region, secondChild->getSecondChild()))
{
if (performTransformation(s->comp(), "%sApplied reassociation rule 9_1_3 to node 0x%p\n", s->optDetailString(), node))
{
TR::Node * newFirstChild = TR::Node::create(firstChild, node->getOpCodeValue(), 2);
newFirstChild->setAndIncChild(0, firstChild->getFirstChild());
newFirstChild->setAndIncChild(1, secondChild->getFirstChild());
TR::Node * newSecondChild = TR::Node::create(secondChild, node->getOpCodeValue(), 2);
newSecondChild->setAndIncChild(0, firstChild->getSecondChild());
newSecondChild->setAndIncChild(1, secondChild->getSecondChild());
TR::Node::recreate(node, firstChild->getOpCodeValue());
node->setAndIncChild(0, newFirstChild);
node->setAndIncChild(1, newSecondChild);
firstChild->recursivelyDecReferenceCount();
secondChild->recursivelyDecReferenceCount();
setExprInvariant(region, newSecondChild);
s->simplifyChildren(node, block);
}
}
// R9_2:
// + +
// / \ / \
// c1 - => - t
// / \ / \
// t c2 c1 c2
else if (node->getOpCode().isAdd() &&
!node->getOpCode().isArrayRef() &&
isExprInvariant(region, firstChild) &&
secondChild->getOpCode().isSub() &&
firstChild->getDataType() == secondChild->getSecondChild()->getDataType() &&
!isExprInvariant(region, secondChild->getFirstChild()) &&
isExprInvariant(region, secondChild->getSecondChild()))
{
if (performTransformation(s->comp(), "%sApplied reassociation rule 9_2 to node 0x%p\n", s->optDetailString(), node))
{
TR::Node * newFirstChild = TR::Node::create(firstChild,
subOps[firstChild->getDataType()], 2);
newFirstChild->setAndIncChild(0, firstChild);
newFirstChild->setAndIncChild(1, secondChild->getSecondChild());
node->setAndIncChild(0, newFirstChild);
node->setAndIncChild(1, secondChild->getFirstChild());
firstChild->recursivelyDecReferenceCount();
secondChild->recursivelyDecReferenceCount();
setExprInvariant(region, newFirstChild);
}
}
// R9_3:
// aiadd aiadd
// / \ / \
// c1 isub => aiadd t
// / \ / \
// t c2 c1 ineg
// \
// c2
else if (node->getOpCode().isArrayRef() &&
isExprInvariant(region, firstChild) &&
secondChild->getOpCode().isSub() &&
!secondChild->getFirstChild()->getOpCode().isRef() && // can't move ref to the RHS
(!isExprInvariant(region, secondChild->getFirstChild()) ||
isSmallConstant(secondChild->getFirstChild(), s)) && // better address expression
isExprInvariant(region, secondChild->getSecondChild()) &&
!isSmallConstant(secondChild->getSecondChild(), s))
{
if (performTransformation(s->comp(), "%sApplied reassociation rule 9_3 to node 0x%p\n", s->optDetailString(), node))
{
TR::Node * newFirstChild = TR::Node::create(firstChild, node->getOpCodeValue(), 2);
TR::Node * newNeg = TR::Node::create(secondChild->getSecondChild(),
negOps[secondChild->getSecondChild()->getDataType()], 1);
TR::Node * zero = TR::Node::create(secondChild->getSecondChild(),
constOps[secondChild->getSecondChild()->getDataType()], 0);
zero->set64bitIntegralValue(0);
newNeg->setAndIncChild(0, secondChild->getSecondChild());
newNeg = s->simplify(newNeg, block);
newFirstChild->setAndIncChild(0, firstChild);
newFirstChild->setAndIncChild(1, newNeg);
newFirstChild->setIsInternalPointer(node->isInternalPointer());
node->setAndIncChild(0, newFirstChild);
node->setAndIncChild(1, secondChild->getFirstChild());
firstChild->recursivelyDecReferenceCount();
secondChild->recursivelyDecReferenceCount();
setExprInvariant(region, newFirstChild);
}
}
}
reassociateBigConstants(node, s);
return node;
}
template <class T>
static TR::Node *addSimplifier(TR::Node * node, TR::Block * block, TR::Simplifier * s)
{
s->simplifyChildren(node, block);
if (node->getOpCodeValue() == TR::iuaddc)
return node;
TR::Node * firstChild = node->getFirstChild(), * secondChild = node->getSecondChild();
if (firstChild->getOpCode().isLoadConst() && secondChild->getOpCode().isLoadConst())
{
T value = firstChild->getConst<T>() + secondChild->getConst<T>();
foldConstant<T>(node, value, s, false /* !anchorChildren*/);
if (node->getOpCode().isUnsigned())
{
if (node->nodeRequiresConditionCodes())
setCCAddUnsigned<T>(value, firstChild->getConst<T>(), node, s);
}
else
{
if (node->nodeRequiresConditionCodes())
setCCAddSigned<T>(value, firstChild->getConst<T>(), secondChild->getConst<T>(), node, s);
}
return node;
}
if (!node->getOpCode().isRef())
{
orderChildren(node, firstChild, secondChild, s);
}
if (node->nodeRequiresConditionCodes())
{
return node;
}
TR::Node *identity = 0;
if (0 != (identity = binaryIdentityOp<T>(node, 0, s)))
return identity;
TR::ILOpCode firstChildOp = firstChild->getOpCode();
TR::ILOpCode secondChildOp = secondChild->getOpCode();
TR::ILOpCode nodeOp = node->getOpCode();
TR::Node * iMulComposerChild = NULL;
T iMulComposerValue = 0;
// normalize adds of positive constants to be isubs. Have to do it this way because
// more negative value than positive in a 2's complement signed representation
if (nodeOp.isAdd() &&
secondChildOp.isLoadConst() &&
secondChild->getConst<T>() > 0)
{
if (performTransformation(s->comp(), "%sNormalized xadd of xconst > 0 in node [%s] to xsub of -xconst\n", s->optDetailString(), node->getName(s->getDebug())))
{
TR::Node::recreate(node, TR::ILOpCode::getSubOpCode<T>());
if (secondChild->getReferenceCount() == 1)
{
secondChild->setConst<T>(-secondChild->getConst<T>());
}
else
{
TR::Node * newSecondChild = TR::Node::create(secondChild, TR::ILOpCode::getConstOpCode<T>(), 0);
newSecondChild->setConst<T>(-secondChild->getConst<T>());
node->setAndIncChild(1, newSecondChild);
secondChild->recursivelyDecReferenceCount();
}
node->setVisitCount(0);
s->_alteredBlock = true;
node = s->simplify(node, block);
}
}
else if (nodeOp.isAdd() && firstChildOp.isNeg())
{
TR::Node * newFirstChild = firstChild->getFirstChild();
// turn ineg +(-1) into bitwise complement
if (TR::DataType::isSignedInt32<T>() && // this code has not been ported to templates yet
secondChildOp.isLoadConst() &&
secondChild->getConst<T>() == -1)
{
if (performTransformation(s->comp(), "%sReduced xadd of -1 and an xneg in node [%s] to bitwise complement\n", s->optDetailString(), node->getName(s->getDebug())))
{
s->anchorChildren(node, s->_curTree);
TR::Node::recreate(node, TR::ixor);
node->setAndIncChild(0, newFirstChild);
firstChild->recursivelyDecReferenceCount();
node->setVisitCount(0);
node = s->simplify(node, block);
s->_alteredBlock = true;
}
}
// Turn add with first child negated into a subtract
else if (performTransformation(s->comp(), "%sReduced iadd with negated first child in node [%s] to isub\n", s->optDetailString(), node->getName(s->getDebug())))
{
bool cannotOverflow = node->cannotOverflow() && firstChild->cannotOverflow();
s->anchorChildren(node, s->_curTree);
TR::Node::recreate(node, TR::ILOpCode::getSubOpCode<T>());
node->setCannotOverflow(cannotOverflow);
node->setAndIncChild(1, newFirstChild);
node->setChild(0, secondChild);
firstChild->recursivelyDecReferenceCount();
node->setVisitCount(0);
node = s->simplify(node, block);
s->_alteredBlock = true;
}
}
// turn add with other child negated in to a subtract
else if (nodeOp.isAdd() && secondChildOp.isNeg())
{
if (performTransformation(s->comp(), "%sReduced iadd with negated second child in node [%s] to isub\n", s->optDetailString(), node->getName(s->getDebug())))
{
s->anchorChildren(node, s->_curTree);
TR::Node * newSecondChild = secondChild->getFirstChild();
TR::Node::recreate(node, TR::ILOpCode::getSubOpCode<T>());
node->setAndIncChild(1, newSecondChild);
secondChild->recursivelyDecReferenceCount();
s->_alteredBlock = true;
node->setVisitCount(0);
node = s->simplify(node, block);
}