Truncate of undef is just undef of smaller size.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148205 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index dd626e2..848ba69 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -2571,17 +2571,18 @@
"Vector element count mismatch!");
if (OpOpcode == ISD::TRUNCATE)
return getNode(ISD::TRUNCATE, DL, VT, Operand.getNode()->getOperand(0));
- else if (OpOpcode == ISD::ZERO_EXTEND || OpOpcode == ISD::SIGN_EXTEND ||
- OpOpcode == ISD::ANY_EXTEND) {
+ if (OpOpcode == ISD::ZERO_EXTEND || OpOpcode == ISD::SIGN_EXTEND ||
+ OpOpcode == ISD::ANY_EXTEND) {
// If the source is smaller than the dest, we still need an extend.
if (Operand.getNode()->getOperand(0).getValueType().getScalarType()
.bitsLT(VT.getScalarType()))
return getNode(OpOpcode, DL, VT, Operand.getNode()->getOperand(0));
- else if (Operand.getNode()->getOperand(0).getValueType().bitsGT(VT))
+ if (Operand.getNode()->getOperand(0).getValueType().bitsGT(VT))
return getNode(ISD::TRUNCATE, DL, VT, Operand.getNode()->getOperand(0));
- else
- return Operand.getNode()->getOperand(0);
+ return Operand.getNode()->getOperand(0);
}
+ if (OpOpcode == ISD::UNDEF)
+ return getUNDEF(VT);
break;
case ISD::BITCAST:
// Basic sanity checking.