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emit_x64_vector: Deduplicate a bit of code within EmitVectorGetElement8()

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Given both branches use the same destination register size, we can hoist
the common code out.
This commit is contained in:
Lioncash 2018-07-06 16:55:01 -04:00 committed by MerryMage
parent eb3ca7f65b
commit b6e223fc58
1 changed files with 5 additions and 6 deletions
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11
src/backend_x64/emit_x64_vector.cpp
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@ -97,22 +97,21 @@ static void EmitTwoArgumentFallback(BlockOfCode& code, EmitContext& ctx, IR::Ins
void EmitX64::EmitVectorGetElement8(EmitContext& ctx, IR::Inst* inst) {
auto args = ctx.reg_alloc.GetArgumentInfo(inst);
ASSERT(args[1].IsImmediate());
u8 index = args[1].GetImmediateU8();
const u8 index = args[1].GetImmediateU8();
Xbyak::Xmm source = ctx.reg_alloc.UseXmm(args[0]);
const Xbyak::Xmm source = ctx.reg_alloc.UseXmm(args[0]);
const Xbyak::Reg32 dest = ctx.reg_alloc.ScratchGpr().cvt32();
if (code.DoesCpuSupport(Xbyak::util::Cpu::tSSE41)) {
Xbyak::Reg32 dest = ctx.reg_alloc.ScratchGpr().cvt32();
code.pextrb(dest, source, index);
ctx.reg_alloc.DefineValue(inst, dest);
} else {
Xbyak::Reg32 dest = ctx.reg_alloc.ScratchGpr().cvt32();
code.pextrw(dest, source, index / 2);
if (index % 2 == 1) {
code.shr(dest, 8);
}
ctx.reg_alloc.DefineValue(inst, dest);
}
ctx.reg_alloc.DefineValue(inst, dest);
}
void EmitX64::EmitVectorGetElement16(EmitContext& ctx, IR::Inst* inst) {