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Trivial patch to speed up legalizing common i64 constants.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31020 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2006-10-17 21:47:13 +00:00
parent 50662beab7
commit b360729873
1 changed files with 7 additions and 0 deletions
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7
lib/CodeGen/SelectionDAG/SelectionDAG.cpp
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@ -1234,6 +1234,13 @@ SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT,
if (N2C && N2C->getValue() == 0)
return N2;
break;
case ISD::OR:
case ISD::XOR:
// (X ^| 0) -> X. This commonly occurs when legalizing i64 values, so it's
// worth handling here.
if (N2C && N2C->getValue() == 0)
return N1;
break;
case ISD::FP_ROUND_INREG:
if (cast<VTSDNode>(N2)->getVT() == VT) return N1; // Not actually rounding.
break;