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| author | Chris Lattner <sabre@nondot.org> | 2006-03-05 19:53:55 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2006-03-05 19:53:55 +0000 |
| commit | cac7059d0f8e6e1be5d4001eb942e23780af2300 (patch) | |
| tree | 769cf1410fdc9163929357b70d948431758f3b54 | |
| parent | c1d9f1de41b26769752224829987a6aa06fe4b87 (diff) | |
| download | external_llvm-cac7059d0f8e6e1be5d4001eb942e23780af2300.zip external_llvm-cac7059d0f8e6e1be5d4001eb942e23780af2300.tar.gz external_llvm-cac7059d0f8e6e1be5d4001eb942e23780af2300.tar.bz2 | |
Reinstate this now that the offending opposite xform has been removed.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26548 91177308-0d34-0410-b5e6-96231b3b80d8
| -rw-r--r-- | lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index bf4b39d..1e05d58 100644 --- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -1454,6 +1454,13 @@ SDOperand DAGCombiner::visitSHL(SDNode *N) { if (N1C && N0.getOpcode() == ISD::SRA && N1 == N0.getOperand(1)) return DAG.getNode(ISD::AND, VT, N0.getOperand(0), DAG.getConstant(~0ULL << N1C->getValue(), VT)); + // fold (shl (add x, c1), c2) -> (add (shl x, c2), c1<<c2) + if (N1C && N0.getOpcode() == ISD::ADD && N0.Val->hasOneUse() && + isa<ConstantSDNode>(N0.getOperand(1))) { + return DAG.getNode(ISD::ADD, VT, + DAG.getNode(ISD::SHL, VT, N0.getOperand(0), N1), + DAG.getNode(ISD::SHL, VT, N0.getOperand(1), N1)); + } return SDOperand(); } |