bool AMDGPULegalizerInfo::legalizeFrint(
MachineInstr &MI, MachineRegisterInfo &MRI,
MachineIRBuilder &MIRBuilder) const {
MIRBuilder.setInstr(MI);
unsigned Src = MI.getOperand(1).getReg();
LLT Ty = MRI.getType(Src);
assert(Ty.isScalar() && Ty.getSizeInBits() == 64);
APFloat C1Val(APFloat::IEEEdouble(), "0x1.0p+52");
APFloat C2Val(APFloat::IEEEdouble(), "0x1.fffffffffffffp+51");
auto C1 = MIRBuilder.buildFConstant(Ty, C1Val);
auto CopySign = MIRBuilder.buildFCopysign(Ty, C1, Src);
// TODO: Should this propagate fast-math-flags?
auto Tmp1 = MIRBuilder.buildFAdd(Ty, Src, CopySign);
auto Tmp2 = MIRBuilder.buildFSub(Ty, Tmp1, CopySign);
auto C2 = MIRBuilder.buildFConstant(Ty, C2Val);
auto Fabs = MIRBuilder.buildFAbs(Ty, Src);
auto Cond = MIRBuilder.buildFCmp(CmpInst::FCMP_OGT, LLT::scalar(1), Fabs, C2);
MIRBuilder.buildSelect(MI.getOperand(0).getReg(), Cond, Src, Tmp2);
return true;
}
X86GenRegisterBankInfo::PartialMappingIdx
X86GenRegisterBankInfo::getPartialMappingIdx(const LLT &Ty, bool isFP) {
if ((Ty.isScalar() && !isFP) || Ty.isPointer()) {
switch (Ty.getSizeInBits()) {
case 1:
case 8:
return PMI_GPR8;
case 16:
return PMI_GPR16;
case 32:
return PMI_GPR32;
case 64:
return PMI_GPR64;
case 128:
return PMI_VEC128;
break;
default:
llvm_unreachable("Unsupported register size.");
}
} else if (Ty.isScalar()) {
switch (Ty.getSizeInBits()) {
case 32:
return PMI_FP32;
case 64:
return PMI_FP64;
case 128:
return PMI_VEC128;
default:
llvm_unreachable("Unsupported register size.");
}
} else {
switch (Ty.getSizeInBits()) {
case 128:
return PMI_VEC128;
case 256:
return PMI_VEC256;
case 512:
return PMI_VEC512;
default:
llvm_unreachable("Unsupported register size.");
}
}
return PMI_None;
}
void MachineIRBuilder::validateTruncExt(unsigned Dst, unsigned Src,
bool IsExtend) {
#ifndef NDEBUG
LLT SrcTy = MRI->getType(Src);
LLT DstTy = MRI->getType(Dst);
if (DstTy.isVector()) {
assert(SrcTy.isVector() && "mismatched cast between vecot and non-vector");
assert(SrcTy.getNumElements() == DstTy.getNumElements() &&
"different number of elements in a trunc/ext");
} else
assert(DstTy.isScalar() && SrcTy.isScalar() && "invalid extend/trunc");
if (IsExtend)
assert(DstTy.getSizeInBits() > SrcTy.getSizeInBits() &&
"invalid narrowing extend");
else
assert(DstTy.getSizeInBits() < SrcTy.getSizeInBits() &&
"invalid widening trunc");
#endif
}