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Add support for fast isel of zext.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55396 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson 2008-08-26 23:14:49 +00:00
parent 99a6cb92d1
commit 97e2568f46
1 changed files with 29 additions and 0 deletions
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29
lib/CodeGen/SelectionDAG/FastISel.cpp
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@ -330,6 +330,35 @@ FastISel::SelectInstructions(BasicBlock::iterator Begin,
// or attempt constant folding.
return I;
case Instruction::ZExt:
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 operand. Halt "fast" selection and bail.
return I;
unsigned ResultReg = FastEmit_r(SrcVT.getSimpleVT(),
DstVT.getSimpleVT(),
ISD::ZERO_EXTEND,
InputReg);
if (!ResultReg)
return I;
ValueMap[I] = ResultReg;
break;
} else
// TODO: Support constant operands
return I;
case Instruction::SIToFP:
if (!isa<ConstantInt>(I->getOperand(0))) {
MVT SrcVT = MVT::getMVT(I->getOperand(0)->getType());