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Add prefetch support for Windows on X64 and AArch64 #56

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Add prefetch support for Windows on X64 and AArch64 #56

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14 changes: 14 additions & 0 deletions src/hotspot/os_cpu/windows_aarch64/prefetch_windows_aarch64.inline.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -27,10 +27,24 @@

// Included in runtime/prefetch.inline.hpp

#include <intrin.h>

// __prefetch2(addr, prfop) emits a PRFM instruction.
// The prfop encoding is: <type><target><policy>
// type: PLD = 00, PLI = 01, PST = 10
// target: L1 = 00, L2 = 01, L3 = 10
// policy: KEEP = 0, STRM = 1

inline void Prefetch::read (const void *loc, intx interval) {
if (interval >= 0) {
__prefetch2((const char*) loc + interval, /* PLD + L1 + KEEP */ 0);
}
}

inline void Prefetch::write(void *loc, intx interval) {
if (interval >= 0) {
__prefetch2((char*) loc + interval, /* PST + L1 + KEEP */ 16);
}
}

#endif // OS_CPU_WINDOWS_AARCH64_PREFETCH_WINDOWS_AARCH64_INLINE_HPP
11 changes: 9 additions & 2 deletions src/hotspot/os_cpu/windows_x86/prefetch_windows_x86.inline.hpp
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Expand Up @@ -27,7 +27,14 @@

// Included in runtime/prefetch.inline.hpp

inline void Prefetch::read (const void *loc, intx interval) {}
inline void Prefetch::write(void *loc, intx interval) {}
#include <xmmintrin.h>

inline void Prefetch::read (const void *loc, intx interval) {
_mm_prefetch((const char*) loc + interval, _MM_HINT_T0);
}

inline void Prefetch::write(void *loc, intx interval) {
_mm_prefetch((const char*) loc + interval, _MM_HINT_T0);
}

#endif // OS_CPU_WINDOWS_X86_PREFETCH_WINDOWS_X86_INLINE_HPP