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Move flag saving to Save/RestoreContext

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This commit is contained in:
offtkp 2024-09-02 02:18:06 +03:00
parent fb7b72476b
commit 1b8a780821
1 changed files with 13 additions and 14 deletions
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27
src/core/cpu_patches.cpp
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@ -212,7 +212,7 @@ static void RestoreRegisters(Xbyak::CodeGenerator& c,
}
/// Switches to the patch stack and stores all registers.
static void SaveContext(Xbyak::CodeGenerator& c) {
static void SaveContext(Xbyak::CodeGenerator& c, bool save_flags = false) {
SaveStack(c);
for (int reg = Xbyak::Operand::RAX; reg <= Xbyak::Operand::R15; reg++) {
c.push(Xbyak::Reg64(reg));
@ -221,11 +221,18 @@ static void SaveContext(Xbyak::CodeGenerator& c) {
c.lea(rsp, ptr[rsp - 32]);
c.vmovdqu(ptr[rsp], Xbyak::Ymm(reg));
}
if (save_flags) {
c.pushfq();
}
}
/// Restores all registers and restores the original stack.
/// If the destination is a register, it is not restored to preserve the output.
static void RestoreContext(Xbyak::CodeGenerator& c, const Xbyak::Operand& dst) {
static void RestoreContext(Xbyak::CodeGenerator& c, const Xbyak::Operand& dst,
bool restore_flags = false) {
if (restore_flags) {
c.popfq();
}
for (int reg = 7; reg >= 0; reg--) {
if ((!dst.isXMM() && !dst.isYMM()) || dst.getIdx() != reg) {
c.vmovdqu(Xbyak::Ymm(reg), ptr[rsp]);
@ -361,9 +368,7 @@ static void GenerateVCVTPH2PS(const ZydisDecodedOperand* operands, Xbyak::CodeGe
const auto float_count = dst.getBit() / 32;
const auto byte_count = float_count * 4;
SaveContext(c);
c.pushfq(); // VCVTPH2PS shouldn't modify flags
SaveContext(c, true);
// Allocate stack space for outputs and load into first parameter.
c.sub(rsp, byte_count);
@ -399,9 +404,7 @@ static void GenerateVCVTPH2PS(const ZydisDecodedOperand* operands, Xbyak::CodeGe
}
c.add(rsp, byte_count);
c.popfq();
RestoreContext(c, dst);
RestoreContext(c, dst, true);
}
using SingleToHalfFloatConverter = half_float::half (*)(float);
@ -429,9 +432,7 @@ static void GenerateVCVTPS2PH(const ZydisDecodedOperand* operands, Xbyak::CodeGe
const auto float_count = src.getBit() / 32;
const auto byte_count = float_count * 4;
SaveContext(c);
c.pushfq(); // VCVTPS2PH shouldn't modify flags
SaveContext(c, true);
if (dst->isXMM()) {
// Allocate stack space for outputs and load into first parameter.
@ -478,9 +479,7 @@ static void GenerateVCVTPS2PH(const ZydisDecodedOperand* operands, Xbyak::CodeGe
c.add(rsp, byte_count);
}
c.popfq();
RestoreContext(c, *dst);
RestoreContext(c, *dst, true);
}
static bool FilterRosetta2Only(const ZydisDecodedOperand*) {