Fix test/Regression/Analysis/BasicAA/2004-07-28-MustAliasbug.llx
This also fixes the miscompilation of MallocBench/gs with dead store
elimination enabled.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15324 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Analysis/BasicAliasAnalysis.cpp b/lib/Analysis/BasicAliasAnalysis.cpp
index 5c8dbe1..9145322 100644
--- a/lib/Analysis/BasicAliasAnalysis.cpp
+++ b/lib/Analysis/BasicAliasAnalysis.cpp
@@ -322,11 +322,15 @@
BasePtr1 = GetGEPOperands(V1, GEP1Ops);
BasePtr2 = GetGEPOperands(V2, GEP2Ops);
- AliasResult GAlias =
- CheckGEPInstructions(BasePtr1->getType(), GEP1Ops, V1Size,
- BasePtr2->getType(), GEP2Ops, V2Size);
- if (GAlias != MayAlias)
- return GAlias;
+ // If GetGEPOperands were able to fold to the same must-aliased pointer,
+ // do the comparison.
+ if (BasePtr1 == BasePtr2) {
+ AliasResult GAlias =
+ CheckGEPInstructions(BasePtr1->getType(), GEP1Ops, V1Size,
+ BasePtr2->getType(), GEP2Ops, V2Size);
+ if (GAlias != MayAlias)
+ return GAlias;
+ }
}
}