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Make DAGCombiner's global alias analysis query more precise in the case
where both pointers have non-zero offsets. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41491 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -4606,8 +4606,9 @@ bool DAGCombiner::isAlias(SDOperand Ptr1, int64_t Size1,
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if (CombinerGlobalAA) {
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// Use alias analysis information.
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int Overlap1 = Size1 + SrcValueOffset1;
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int Overlap2 = Size2 + SrcValueOffset2;
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int64_t MinOffset = std::min(SrcValueOffset1, SrcValueOffset2);
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int64_t Overlap1 = Size1 + SrcValueOffset1 - MinOffset;
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int64_t Overlap2 = Size2 + SrcValueOffset2 - MinOffset;
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AliasAnalysis::AliasResult AAResult =
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AA.alias(SrcValue1, Overlap1, SrcValue2, Overlap2);
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if (AAResult == AliasAnalysis::NoAlias)
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