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[PPC] vcfsx/vcfux optimization/simplification

This commit is contained in:
Triang3l 2020-12-10 21:29:33 +03:00
parent db1d6b1fef
commit cb93ddf873
1 changed files with 4 additions and 4 deletions
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8
src/xenia/cpu/ppc/ppc_emit_altivec.cc
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@ -519,8 +519,8 @@ int InstrEmit_vavguw(PPCHIRBuilder& f, const InstrData& i) {
int InstrEmit_vcfsx_(PPCHIRBuilder& f, uint32_t vd, uint32_t vb, int InstrEmit_vcfsx_(PPCHIRBuilder& f, uint32_t vd, uint32_t vb,
uint32_t uimm) { uint32_t uimm) {
// (VD) <- float(VB as signed) / 2^uimm // (VD) <- float(VB as signed) / 2^uimm
float fuimm = static_cast<float>(std::exp2(uimm)); float fuimm = std::ldexp(1.0f, -int32_t(uimm));
Value* v = f.Div(f.VectorConvertI2F(f.LoadVR(vb)), Value* v = f.Mul(f.VectorConvertI2F(f.LoadVR(vb)),
f.Splat(f.LoadConstantFloat32(fuimm), VEC128_TYPE)); f.Splat(f.LoadConstantFloat32(fuimm), VEC128_TYPE));
f.StoreVR(vd, v); f.StoreVR(vd, v);
return 0; return 0;
@ -535,8 +535,8 @@ int InstrEmit_vcsxwfp128(PPCHIRBuilder& f, const InstrData& i) {
int InstrEmit_vcfux_(PPCHIRBuilder& f, uint32_t vd, uint32_t vb, int InstrEmit_vcfux_(PPCHIRBuilder& f, uint32_t vd, uint32_t vb,
uint32_t uimm) { uint32_t uimm) {
// (VD) <- float(VB as unsigned) / 2^uimm // (VD) <- float(VB as unsigned) / 2^uimm
float fuimm = static_cast<float>(std::exp2(uimm)); float fuimm = std::ldexp(1.0f, -int32_t(uimm));
Value* v = f.Div(f.VectorConvertI2F(f.LoadVR(vb), ARITHMETIC_UNSIGNED), Value* v = f.Mul(f.VectorConvertI2F(f.LoadVR(vb), ARITHMETIC_UNSIGNED),
f.Splat(f.LoadConstantFloat32(fuimm), VEC128_TYPE)); f.Splat(f.LoadConstantFloat32(fuimm), VEC128_TYPE));
f.StoreVR(vd, v); f.StoreVR(vd, v);
return 0; return 0;