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DAGCombine should not produce ISD::OR nodes after operation legalization if they're not legal.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200503 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson 2014-01-31 00:51:43 +00:00
parent 21f09088d3
commit 45b07e157c
1 changed files with 4 additions and 2 deletions
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4
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -1544,10 +1544,12 @@ SDValue DAGCombiner::visitADD(SDNode *N) {
// If all possibly-set bits on the LHS are clear on the RHS, return an OR.
// If all possibly-set bits on the RHS are clear on the LHS, return an OR.
if ((RHSZero & ~LHSZero) == ~LHSZero || (LHSZero & ~RHSZero) == ~RHSZero)
if ((RHSZero & ~LHSZero) == ~LHSZero || (LHSZero & ~RHSZero) == ~RHSZero){
if (!LegalOperations || TLI.isOperationLegal(ISD::OR, VT))
return DAG.getNode(ISD::OR, SDLoc(N), VT, N0, N1);
}
}
}
// fold (add (shl (add x, c1), c2), ) -> (add (add (shl x, c2), c1<<c2), )
if (N0.getOpcode() == ISD::SHL && N0.getNode()->hasOneUse()) {