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[PPC] vcfsx/vcfux: Only mul if needed

This commit is contained in:
Triang3l 2020-12-10 21:34:37 +03:00
parent cb93ddf873
commit d0b849aad7
1 changed files with 10 additions and 6 deletions
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16
src/xenia/cpu/ppc/ppc_emit_altivec.cc
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@ -519,9 +519,11 @@ int InstrEmit_vavguw(PPCHIRBuilder& f, const InstrData& i) {
int InstrEmit_vcfsx_(PPCHIRBuilder& f, uint32_t vd, uint32_t vb,
uint32_t uimm) {
// (VD) <- float(VB as signed) / 2^uimm
float fuimm = std::ldexp(1.0f, -int32_t(uimm));
Value* v = f.Mul(f.VectorConvertI2F(f.LoadVR(vb)),
f.Splat(f.LoadConstantFloat32(fuimm), VEC128_TYPE));
Value* v = f.VectorConvertI2F(f.LoadVR(vb));
if (uimm) {
float fuimm = std::ldexp(1.0f, -int(uimm));
v = f.Mul(v, f.Splat(f.LoadConstantFloat32(fuimm), VEC128_TYPE));
}
f.StoreVR(vd, v);
return 0;
}
@ -535,9 +537,11 @@ int InstrEmit_vcsxwfp128(PPCHIRBuilder& f, const InstrData& i) {
int InstrEmit_vcfux_(PPCHIRBuilder& f, uint32_t vd, uint32_t vb,
uint32_t uimm) {
// (VD) <- float(VB as unsigned) / 2^uimm
float fuimm = std::ldexp(1.0f, -int32_t(uimm));
Value* v = f.Mul(f.VectorConvertI2F(f.LoadVR(vb), ARITHMETIC_UNSIGNED),
f.Splat(f.LoadConstantFloat32(fuimm), VEC128_TYPE));
Value* v = f.VectorConvertI2F(f.LoadVR(vb), ARITHMETIC_UNSIGNED);
if (uimm) {
float fuimm = std::ldexp(1.0f, -int(uimm));
v = f.Mul(v, f.Splat(f.LoadConstantFloat32(fuimm), VEC128_TYPE));
}
f.StoreVR(vd, v);
return 0;
}