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Merge pull request #770 from OFFTKP/jump

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Get rid of unnecessary jump
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psucien 2024-09-06 22:56:44 +02:00 committed by GitHub
parent 09ce12a868 f31c92ffd1
commit f1fd846762
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GPG key ID: B5690EEEBB952194
1 changed files with 6 additions and 12 deletions
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18
src/core/cpu_patches.cpp
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@ -315,14 +315,12 @@ static void GenerateBLSI(const ZydisDecodedOperand* operands, Xbyak::CodeGenerat
SaveRegisters(c, {scratch});
// BLSI sets CF to zero if source is zero, otherwise it sets CF to one.
Xbyak::Label set_carry, clear_carry, end;
Xbyak::Label clear_carry, end;
c.mov(scratch, *src);
c.neg(scratch); // NEG, like BLSI, clears CF if the source is zero and sets it otherwise
c.jc(set_carry);
c.jmp(clear_carry);
c.jnc(clear_carry);
c.L(set_carry);
c.and_(scratch, *src);
c.stc(); // setting/clearing carry needs to happen after the AND because that clears CF
c.jmp(end);
@ -345,15 +343,13 @@ static void GenerateBLSMSK(const ZydisDecodedOperand* operands, Xbyak::CodeGener
SaveRegisters(c, {scratch});
Xbyak::Label set_carry, clear_carry, end;
Xbyak::Label 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.jnz(clear_carry);
c.L(set_carry);
c.dec(scratch);
c.xor_(scratch, *src);
c.stc();
@ -378,15 +374,13 @@ static void GenerateBLSR(const ZydisDecodedOperand* operands, Xbyak::CodeGenerat
SaveRegisters(c, {scratch});
Xbyak::Label set_carry, clear_carry, end;
Xbyak::Label clear_carry, end;
// BLSR 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.jnz(clear_carry);
c.L(set_carry);
c.dec(scratch);
c.and_(scratch, *src);
c.stc();