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emit_x64_vector: Slightly improve ArithmeticShiftRightByte

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This commit is contained in:
MerryMage 2018-07-25 09:33:02 +01:00
parent 43407c4bb4
commit 0921678edb
1 changed files with 5 additions and 8 deletions
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13
src/backend_x64/emit_x64_vector.cpp
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@ -381,14 +381,11 @@ void EmitX64::EmitVectorAnd(EmitContext& ctx, IR::Inst* inst) {
static void ArithmeticShiftRightByte(EmitContext& ctx, BlockOfCode& code, const Xbyak::Xmm& result, u8 shift_amount) {
const Xbyak::Xmm tmp = ctx.reg_alloc.ScratchXmm();
// TODO: Optimize
code.movdqa(tmp, result);
code.pslldq(tmp, 1);
code.psraw(tmp, shift_amount);
code.psraw(result, shift_amount + 8);
code.psllw(result, 8);
code.psrlw(tmp, 8);
code.por(result, tmp);
code.punpckhbw(tmp, result);
code.punpcklbw(result, result);
code.psraw(tmp, 8 + shift_amount);
code.psraw(result, 8 + shift_amount);
code.packsswb(result, tmp);
}
void EmitX64::EmitVectorArithmeticShiftRight8(EmitContext& ctx, IR::Inst* inst) {