Intrinsics don't touch internal global variables

(unless passed one via a parameter), even if they
are IntrWriteMem.

llvm-svn: 56115

1 files changed, 4 insertions, 2 deletions

diff --git a/llvm/lib/Analysis/IPA/GlobalsModRef.cpp b/llvm/lib/Analysis/IPA/GlobalsModRef.cpp
index 6063a1d16b7..6736e6f3ce4 100644
--- a/llvm/lib/Analysis/IPA/GlobalsModRef.cpp
+++ b/llvm/lib/Analysis/IPA/GlobalsModRef.cpp
@@ -392,8 +392,10 @@ void GlobalsModRef::AnalyzeCallGraph(CallGraph &CG, Module &M) {
               FR.GlobalInfo[*GI] |= Ref;
           }
         } else {
-          // Can't say anything useful.
-          KnowNothing = true;
+          FunctionEffect |= ModRef;
+          // Can't say anything useful unless it's an intrinsic - they don't
+          // read or write global variables of the kind considered here.
+          KnowNothing = !F->isIntrinsic();
         }
         continue;
       }