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Optimizing eflags access (I think).

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This commit is contained in:
Ben Vanik
2014-08-22 21:58:57 -07:00
parent 540b192b1a
commit 168239b469
1 changed files with 2 additions and 3 deletions
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5
src/alloy/backend/x64/x64_emitter.cc
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@@ -732,8 +732,7 @@ void X64Emitter::nop(size_t length) {
void X64Emitter::LoadEflags() { void X64Emitter::LoadEflags() {
#if STORE_EFLAGS #if STORE_EFLAGS
mov(eax, dword[rsp + STASH_OFFSET]); mov(eax, dword[rsp + STASH_OFFSET]);
push(rax); btr(eax, 0);
popf();
#else #else
// EFLAGS already present. // EFLAGS already present.
#endif // STORE_EFLAGS #endif // STORE_EFLAGS
@@ -742,7 +741,7 @@ void X64Emitter::LoadEflags() {
void X64Emitter::StoreEflags() { void X64Emitter::StoreEflags() {
#if STORE_EFLAGS #if STORE_EFLAGS
pushf(); pushf();
pop(qword[rsp + STASH_OFFSET]); pop(dword[rsp + STASH_OFFSET]);
#else #else
// EFLAGS should have CA set? // EFLAGS should have CA set?
// (so long as we don't fuck with it) // (so long as we don't fuck with it)