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Set CF correctly on BLSMSK patch

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offtkp 2024-09-02 02:35:13 +03:00
parent afcdd26948
commit b7fea22c7d
1 changed files with 17 additions and 0 deletions
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17
src/core/cpu_patches.cpp
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@ -323,9 +323,26 @@ static void GenerateBLSMSK(const ZydisDecodedOperand* operands, Xbyak::CodeGener
SaveRegisters(c, {scratch});
Xbyak::Label set_carry, clear_carry, end;
// BLSMSK sets CF to zero if source is NOT zero, otherwise it sets CF to one.
c.mov(scratch, *src);
c.test(scratch, scratch);
c.jz(set_carry);
c.jmp(clear_carry);
c.L(set_carry);
c.dec(scratch);
c.xor_(scratch, *src);
c.stc();
c.jmp(end);
c.L(clear_carry);
c.dec(scratch);
c.xor_(scratch, *src);
// We don't need to clear carry here since XOR does that for us
c.L(end);
c.mov(dst, scratch);
RestoreRegisters(c, {scratch});