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Truncate of undef is just undef of smaller size.

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llvm-svn: 148205
This commit is contained in:
Craig Topper 2012-01-15 01:05:11 +00:00
parent 0c4ab86d2c
commit 7380799e4a
1 changed files with 6 additions and 5 deletions
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11
lib/CodeGen/SelectionDAG/SelectionDAG.cpp
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@ -2571,17 +2571,18 @@ SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL,
"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.