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| author | Chris Lattner <sabre@nondot.org> | 2005-04-18 04:11:19 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2005-04-18 04:11:19 +0000 |
| commit | 868d47300900bdbcaa2e166b4e9c411ac48a436e (patch) | |
| tree | 4af2e3109242c70627d279860435f7b91e495ebd /llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp | |
| parent | bd22d83d15bcc4466133c39c6a42ed7d344eeb89 (diff) | |
| download | bcm5719-llvm-868d47300900bdbcaa2e166b4e9c411ac48a436e.tar.gz bcm5719-llvm-868d47300900bdbcaa2e166b4e9c411ac48a436e.zip | |
Another simple xform
llvm-svn: 21317
Diffstat (limited to 'llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp index 3058ceafe27..a52289fb387 100644 --- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp @@ -964,6 +964,14 @@ SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT, return getSetCC(Result, LHS->getValueType(0), LL, LR); } } + + // and/or zext(a), zext(b) -> zext(and/or a, b) + if (N1.getOpcode() == ISD::ZERO_EXTEND && + N2.getOpcode() == ISD::ZERO_EXTEND && + N1.getOperand(0).getValueType() == N2.getOperand(0).getValueType()) + return getNode(ISD::ZERO_EXTEND, VT, + getNode(Opcode, N1.getOperand(0).getValueType(), + N1.getOperand(0), N2.getOperand(0))); break; case ISD::XOR: if (N1 == N2) return getConstant(0, VT); // xor X, Y -> 0 |
