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emit_x64_vector: bug: VectorGetElement8 returning incorrect values for non-SSE4.1

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This bug wasn't discovered earlier because we previously only used index == 0.
This commit is contained in:
MerryMage 2018-02-02 21:07:00 +00:00
parent ebfc51c609
commit 6414736a8d
1 changed files with 4 additions and 1 deletions
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5
src/backend_x64/emit_x64_vector.cpp
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@ -41,7 +41,10 @@ void EmitX64::EmitVectorGetElement8(EmitContext& ctx, IR::Inst* inst) {
ctx.reg_alloc.DefineValue(inst, dest);
} else {
Xbyak::Reg32 dest = ctx.reg_alloc.ScratchGpr().cvt32();
code->pextrw(dest, source, index);
code->pextrw(dest, source, index / 2);
if (index % 2 == 1) {
code->shr(dest, 8);
}
ctx.reg_alloc.DefineValue(inst, dest);
}
}