Fix PR2032. Inform the alias analysis of changes to the underlying program.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47111 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Transforms/Scalar/GVN.cpp b/lib/Transforms/Scalar/GVN.cpp
index 95bb0ddfbc4e6be725baee6e14cbe0772c3a6ebf..41a23ed6c7cf2123cc470e41d354b1d309862408 100644 (file)
--- a/lib/Transforms/Scalar/GVN.cpp
+++ b/lib/Transforms/Scalar/GVN.cpp
@@ -857,6 +857,8 @@ Value *GVN::GetValueForBlock(BasicBlock *BB, LoadInst* orig,
     
     PN->addIncoming(val, *PI);
   }
+  AliasAnalysis& AA = getAnalysis<AliasAnalysis>();
+  AA.copyValue(orig, PN);
   
   // Attempt to collapse PHI nodes that are trivially redundant
   Value* v = CollapsePhi(PN);