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eliminate some ops if they have an undef RHS

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34908 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2007-03-04 20:01:46 +00:00
parent 8f3acf87a2
commit 175415e116
1 changed files with 2 additions and 0 deletions
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2
lib/CodeGen/SelectionDAG/SelectionDAG.cpp
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@ -1325,6 +1325,8 @@ SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT,
if (N2.getOpcode() == ISD::UNDEF) {
switch (Opcode) {
case ISD::ADD:
case ISD::ADDC:
case ISD::ADDE:
case ISD::SUB:
case ISD::FADD:
case ISD::FSUB: