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Add support for fast isel of sitofp, and remove some unnecessary and imprecise legality checks. 

llvm-svn: 55381
This commit is contained in:
Owen Anderson 2008-08-26 20:37:00 +00:00
parent cf7154b2d6
commit 3c4dc434ee
1 changed files with 28 additions and 4 deletions
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32
llvm/lib/CodeGen/SelectionDAG/FastISel.cpp
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@ -293,10 +293,6 @@ FastISel::SelectInstructions(BasicBlock::iterator Begin,
!TLI.isTypeLegal(SrcVT) || !TLI.isTypeLegal(DstVT))
// Unhandled type. Halt "fast" selection and bail.
return I;
if (TLI.getOperationAction(ISD::FP_TO_SINT, SrcVT) !=
TargetLowering::Legal)
// Unhandled opcode on this type. Halt "fast" seleciton and bail.
return I;
unsigned InputReg = ValueMap[I->getOperand(0)];
if (!InputReg)
@ -317,6 +313,34 @@ FastISel::SelectInstructions(BasicBlock::iterator Begin,
// or attempt constant folding.
return I;
case Instruction::SIToFP:
if (!isa<ConstantInt>(I->getOperand(0))) {
MVT SrcVT = MVT::getMVT(I->getOperand(0)->getType());
MVT DstVT = MVT::getMVT(I->getType());
if (SrcVT == MVT::Other || !SrcVT.isSimple() ||
DstVT == MVT::Other || !DstVT.isSimple() ||
!TLI.isTypeLegal(SrcVT) || !TLI.isTypeLegal(DstVT))
// Unhandled type. Halt "fast" selection and bail.
return I;
unsigned InputReg = ValueMap[I->getOperand(0)];
if (!InputReg)
// Unhandled operan. Halt "fast" selection and bail.
return I;
unsigned ResultReg = FastEmit_r(SrcVT.getSimpleVT(),
DstVT.getSimpleVT(),
ISD::SINT_TO_FP,
InputReg);
if (!ResultReg)
return I;
ValueMap[I] = ResultReg;
break;
} else
// TODO: Materialize constant and convert to FP.
return I;
default:
// Unhandled instruction. Halt "fast" selection and bail.
return I;