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block_of_code: Remove vzeroupper

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This commit is contained in:
MerryMage 2017-12-04 22:13:28 +00:00
parent 05f3f07704
commit f595f85039
2 changed files with 0 additions and 12 deletions
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6
src/backend_x64/block_of_code.cpp
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@ -105,12 +105,6 @@ void BlockOfCode::GenRunCode() {
align();
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:
// 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

6
src/backend_x64/block_of_code.h
View file

@ -51,12 +51,6 @@ public:
const u64 address = reinterpret_cast<u64>(fn);
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) {
// Far call
mov(rax, address);