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core corrections
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30570 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -46,13 +46,9 @@ namespace {
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"Number of dag nodes combined");
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#ifndef NDEBUG
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static cl::opt<bool>
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CombinerAA("combiner-alias-analysis", cl::Hidden,
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cl::desc("Turn on alias analysis turning testing"));
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#else
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static const bool CombinerAA = 0;
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#endif
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class VISIBILITY_HIDDEN DAGCombiner {
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SelectionDAG &DAG;
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@ -2594,14 +2590,14 @@ bool DAGCombiner::isNotAlias(SDOperand Ptr1, SDOperand Ptr2) {
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// Mind the flag.
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if (!CombinerAA) return false;
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// If they are the same then they are simple aliases.
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// If they are the same then they must be aliases.
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if (Ptr1 == Ptr2) return false;
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// If either operand is a frame value (not the same location from above test)
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// If both operands are frame values (not the same location from above test)
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// then they can't alias.
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FrameIndexSDNode *FI1 = dyn_cast<FrameIndexSDNode>(Ptr1);
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FrameIndexSDNode *FI2 = dyn_cast<FrameIndexSDNode>(Ptr2);
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if (FI1 || FI2) {
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if (FI1 && FI2) {
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return true;
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}
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@ -2651,9 +2647,7 @@ SDOperand DAGCombiner::visitSTORE(SDNode *N) {
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SDOperand Token = DAG.getNode(ISD::TokenFactor, MVT::Other,
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Chain, ReplStore);
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// Replace uses with token.
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CombineTo(N, Token);
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// Don't recombine on token.
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return SDOperand(N, 0);
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return Token;
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}
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return SDOperand();
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