Fix the alias analysis query in DAGCombiner to not add in two

offsets. The SrcValueOffset values are the real offsets from the
SrcValue base pointers.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40534 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index 22c6e6b396c7855c3e4f1bfd4af9b312a526c090..b38b479cbe8dc024582d78fb55d4a9aecadb0ac9 100644 (file)
--- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -4599,8 +4599,8 @@ bool DAGCombiner::isAlias(SDOperand Ptr1, int64_t Size1,
 
   if (CombinerGlobalAA) {
     // Use alias analysis information.
-    int Overlap1 = Size1 + SrcValueOffset1 + Offset1;
-    int Overlap2 = Size2 + SrcValueOffset2 + Offset2;
+    int Overlap1 = Size1 + SrcValueOffset1;
+    int Overlap2 = Size2 + SrcValueOffset2;
     AliasAnalysis::AliasResult AAResult = 
                              AA.alias(SrcValue1, Overlap1, SrcValue2, Overlap2);
     if (AAResult == AliasAnalysis::NoAlias)