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A couple nits

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This commit is contained in:
offtkp 2024-09-23 20:20:03 +03:00
parent a37535fa09
commit 5d2a4ed7ce
1 changed files with 4 additions and 8 deletions
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12
src/core/cpu_patches.cpp
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@ -842,7 +842,7 @@ static void GenerateINSERTQ(const ZydisDecodedOperand* operands, Xbyak::CodeGene
MAYBE_AVX(movq, scratch1, xmm_src);
c.and_(scratch1, mask);
// dst &= ~(mask << index)
// mask = ~(mask << index)
c.mov(cl, index.cvt8());
c.shl(mask, cl);
c.not_(mask);
@ -850,17 +850,13 @@ static void GenerateINSERTQ(const ZydisDecodedOperand* operands, Xbyak::CodeGene
// src <<= index
c.shl(scratch1, cl);
// dst = (dst & mask) | src
MAYBE_AVX(movq, scratch2, xmm_dst);
c.and_(scratch2, mask);
c.or_(scratch2, scratch1);
// Insert scratch2 into low 64 bits of dst, upper 64 bits are unaffected
Cpu cpu;
if (cpu.has(Cpu::tAVX)) {
c.vpinsrq(xmm_dst, xmm_dst, scratch2, 0);
} else {
c.pinsrq(xmm_dst, scratch2, 0);
}
// Upper 64 bits are undefined in insertq
MAYBE_AVX(movq, xmm_dst, scratch2);
c.pop(mask);
c.pop(index);