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-rw-r--r--lib/CodeGen/SelectionDAG/FastISel.cpp29
1 files changed, 29 insertions, 0 deletions
diff --git a/lib/CodeGen/SelectionDAG/FastISel.cpp b/lib/CodeGen/SelectionDAG/FastISel.cpp
index b0369b3..99ffc3f 100644
--- a/lib/CodeGen/SelectionDAG/FastISel.cpp
+++ b/lib/CodeGen/SelectionDAG/FastISel.cpp
@@ -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());