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block_of_code: Add vzeroupper instructions where AVX-SSE transitions may occur

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This commit is contained in:
MerryMage 2017-11-02 20:07:01 +00:00
parent 60d9392b5c
commit 19dcdde90b
2 changed files with 12 additions and 0 deletions
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6
src/backend_x64/block_of_code.cpp
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@ -86,6 +86,12 @@ void BlockOfCode::GenRunCode() {
align(); align();
run_code = getCurr<RunCodeFuncType>(); run_code = getCurr<RunCodeFuncType>();
// As we currently do not emit AVX instructions, AVX-SSE transition may occur.
// We avoid the transition penalty by calling vzeroupper.
if (DoesCpuSupport(Xbyak::util::Cpu::tAVX)) {
vzeroupper();
}
// This serves two purposes: // This serves two purposes:
// 1. It saves all the registers we as a callee need to save. // 1. It saves all the registers we as a callee need to save.
// 2. It aligns the stack so that the code the JIT emits can assume // 2. It aligns the stack so that the code the JIT emits can assume

6
src/backend_x64/block_of_code.h
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@ -49,6 +49,12 @@ public:
const u64 address = reinterpret_cast<u64>(fn); const u64 address = reinterpret_cast<u64>(fn);
const u64 distance = address - (getCurr<u64>() + 5); const u64 distance = address - (getCurr<u64>() + 5);
// As we do not know if user-code is AVX or SSE, an AVX-SSE transition may occur.
// We avoid the transition penalty by calling vzeroupper.
if (DoesCpuSupport(Xbyak::util::Cpu::tAVX)) {
vzeroupper();
}
if (distance >= 0x0000000080000000ULL && distance < 0xFFFFFFFF80000000ULL) { if (distance >= 0x0000000080000000ULL && distance < 0xFFFFFFFF80000000ULL) {
// Far call // Far call
mov(rax, address); mov(rax, address);