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| author | Chris Lattner <sabre@nondot.org> | 2008-01-26 01:05:42 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2008-01-26 01:05:42 +0000 |
| commit | 9967c15183e023b7cf59b094d69530ffeca1aa0f (patch) | |
| tree | 225859b61eb744bc0364a59111bfb3d5c8b92981 /lib/CodeGen/SelectionDAG/SelectionDAG.cpp | |
| parent | 6bccafdfae89ee0d21f60019050fbc477d618de0 (diff) | |
don't bother making x&-1 only to simplify it in dag combine. This commonly occurs expanding i64 ops.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46383 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/SelectionDAG/SelectionDAG.cpp')
| -rw-r--r-- | lib/CodeGen/SelectionDAG/SelectionDAG.cpp | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp index efbaa5a7f6..ad6cd1ba3d 100644 --- a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp +++ b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp @@ -1877,6 +1877,8 @@ SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT, // worth handling here. if (N2C && N2C->getValue() == 0) return N2; + if (N2C && N2C->isAllOnesValue()) // X & -1 -> X + return N1; break; case ISD::OR: case ISD::XOR: |