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Add TZCNT

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This commit is contained in:
offtkp 2025-02-24 16:47:02 +02:00
parent 6103d49f98
commit 16e175af5d
1 changed files with 27 additions and 0 deletions
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27
src/core/cpu_patches.cpp
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@ -391,6 +391,32 @@ static void GenerateBLSMSK(const ZydisDecodedOperand* operands, Xbyak::CodeGener
RestoreRegisters(c, {scratch});
}
static void GenerateTZCNT(const ZydisDecodedOperand* operands, Xbyak::CodeGenerator& c) {
const auto dst = ZydisToXbyakRegisterOperand(operands[0]);
const auto src = ZydisToXbyakOperand(operands[1]);
Xbyak::Label src_zero, end;
c.cmp(*src, 0);
c.je(src_zero);
// If src is not zero, functions like a BSF, but also clears the CF
c.bsf(dst, *src);
c.clc();
c.jmp(end);
c.L(src_zero);
c.mov(dst, operands[0].size);
// Since dst is not zero, also set ZF to zero. Testing dst with itself when we know
// it isn't zero is a good way to do this.
// Use cvt32 to avoid REX/Operand size prefixes.
c.test(dst.cvt32(), dst.cvt32());
// When source is zero, TZCNT also sets CF.
c.stc();
c.L(end);
}
static void GenerateBLSR(const ZydisDecodedOperand* operands, Xbyak::CodeGenerator& c) {
const auto dst = ZydisToXbyakRegisterOperand(operands[0]);
const auto src = ZydisToXbyakOperand(operands[1]);
@ -910,6 +936,7 @@ static const std::unordered_map<ZydisMnemonic, PatchInfo> Patches = {
{ZYDIS_MNEMONIC_BLSI, {FilterNoBMI1, GenerateBLSI, true}},
{ZYDIS_MNEMONIC_BLSMSK, {FilterNoBMI1, GenerateBLSMSK, true}},
{ZYDIS_MNEMONIC_BLSR, {FilterNoBMI1, GenerateBLSR, true}},
{ZYDIS_MNEMONIC_TZCNT, {FilterNoBMI1, GenerateTZCNT, true}},
#ifdef __APPLE__
// Patches for instruction sets not supported by Rosetta 2.