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emit_x64: Use xorps/xorpd when argument to TransferToFP32/TransferToFP64 is an immediate zero

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This commit is contained in:
MerryMage 2016-12-03 11:36:03 +00:00
parent e166965f3e
commit cede5e442a
1 changed files with 18 additions and 8 deletions
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10
src/backend_x64/emit_x64.cpp
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@ -1677,18 +1677,28 @@ void EmitX64::EmitTransferFromFP64(IR::Block& block, IR::Inst* inst) {
} }
void EmitX64::EmitTransferToFP32(IR::Block& block, IR::Inst* inst) { void EmitX64::EmitTransferToFP32(IR::Block& block, IR::Inst* inst) {
if (inst->GetArg(0).IsImmediate() && inst->GetArg(0).GetU32() == 0) {
Xbyak::Xmm result = reg_alloc.DefXmm(inst);
code->xorps(result, result);
} else {
Xbyak::Xmm result = reg_alloc.DefXmm(inst); Xbyak::Xmm result = reg_alloc.DefXmm(inst);
Xbyak::Reg32 source = reg_alloc.UseGpr(inst->GetArg(0)).cvt32(); Xbyak::Reg32 source = reg_alloc.UseGpr(inst->GetArg(0)).cvt32();
// TODO: Eliminate this. // TODO: Eliminate this.
code->movd(result, source); code->movd(result, source);
} }
}
void EmitX64::EmitTransferToFP64(IR::Block& block, IR::Inst* inst) { void EmitX64::EmitTransferToFP64(IR::Block& block, IR::Inst* inst) {
if (inst->GetArg(0).IsImmediate() && inst->GetArg(0).GetU64() == 0) {
Xbyak::Xmm result = reg_alloc.DefXmm(inst);
code->xorpd(result, result);
} else {
Xbyak::Xmm result = reg_alloc.DefXmm(inst); Xbyak::Xmm result = reg_alloc.DefXmm(inst);
Xbyak::Reg64 source = reg_alloc.UseGpr(inst->GetArg(0)); Xbyak::Reg64 source = reg_alloc.UseGpr(inst->GetArg(0));
// TODO: Eliminate this. // TODO: Eliminate this.
code->movq(result, source); code->movq(result, source);
} }
}
void EmitX64::EmitFPAbs32(IR::Block&, IR::Inst* inst) { void EmitX64::EmitFPAbs32(IR::Block&, IR::Inst* inst) {
IR::Value a = inst->GetArg(0); IR::Value a = inst->GetArg(0);