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| author | Chris Lattner <sabre@nondot.org> | 2006-10-17 21:47:13 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2006-10-17 21:47:13 +0000 |
| commit | 78fd0f83ff58137dccad35fa253da4ee5d1010fe (patch) | |
| tree | ae95cf09ad4af1e722ffdc261f70ee7dfde96597 /llvm/lib | |
| parent | 327b88b102ccdba3362b99ad0c30201b12ee6e56 (diff) | |
| download | bcm5719-llvm-78fd0f83ff58137dccad35fa253da4ee5d1010fe.tar.gz bcm5719-llvm-78fd0f83ff58137dccad35fa253da4ee5d1010fe.zip | |
Trivial patch to speed up legalizing common i64 constants.
llvm-svn: 31020
Diffstat (limited to 'llvm/lib')
| -rw-r--r-- | llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp index a2aee097192..45fd350496c 100644 --- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp @@ -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; |
