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Add support for fast isel of non-constant fptosi instructions.

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llvm-svn: 55373
This commit is contained in:
Owen Anderson 2008-08-26 17:44:42 +00:00
parent ee460cd197
commit 76c3c73a7a
1 changed files with 43 additions and 5 deletions
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48
lib/CodeGen/SelectionDAG/FastISel.cpp
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@ -229,9 +229,13 @@ FastISel::SelectInstructions(BasicBlock::iterator Begin,
if (ConstantInt* CI = dyn_cast<ConstantInt>(I->getOperand(0))) {
if (I->getType()->isInteger()) {
MVT VT = MVT::getMVT(I->getType(), /*HandleUnknown=*/false);
ValueMap[I] = FastEmit_i(VT.getSimpleVT(), VT.getSimpleVT(),
ISD::Constant,
CI->getZExtValue());
unsigned result = FastEmit_i(VT.getSimpleVT(), VT.getSimpleVT(),
ISD::Constant,
CI->getZExtValue());
if (!result)
return I;
ValueMap[I] = result;
break;
} else
// TODO: Support vector and fp constants.
@ -239,7 +243,7 @@ FastISel::SelectInstructions(BasicBlock::iterator Begin,
} else if (!isa<Constant>(I->getOperand(0))) {
// Bitcasts of non-constant values become reg-reg copies.
MVT SrcVT = MVT::getMVT(I->getOperand(0)->getType());
MVT DstVT = MVT::getMVT(I->getOperand(0)->getType());
MVT DstVT = MVT::getMVT(I->getType());
if (SrcVT == MVT::Other || !SrcVT.isSimple() ||
DstVT == MVT::Other || !DstVT.isSimple() ||
@ -265,7 +269,41 @@ FastISel::SelectInstructions(BasicBlock::iterator Begin,
break;
} else
// Casting a non-integral constant?
// TODO: Casting a non-integral constant?
return I;
case Instruction::FPToSI:
if (!isa<ConstantFP>(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;
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)
// Unhandled operand. Halt "fast" selection and bail.
return I;
unsigned ResultReg = FastEmit_r(SrcVT.getSimpleVT(),
DstVT.getSimpleVT(),
ISD::FP_TO_SINT,
InputReg);
if (!ResultReg)
return I;
ValueMap[I] = ResultReg;
break;
} else
// TODO: Materialize the FP constant and then convert,
// or attempt constant folding.
return I;
default: