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Reinstate this now that the offending opposite xform has been removed.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26548 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2006-03-05 19:53:55 +00:00
parent c1d9f1de41
commit cac7059d0f
1 changed files with 7 additions and 0 deletions
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7
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -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();
}