use the new isNoAlias method to simplify some code, only do an escaping check if

we have a non-constant pointer.  Constant pointers can't be local.

llvm-svn: 89665

1 files changed, 4 insertions, 3 deletions

diff --git a/llvm/lib/Analysis/AliasAnalysis.cpp b/llvm/lib/Analysis/AliasAnalysis.cpp
index 92fa1df..dee9b53 100644
--- a/llvm/lib/Analysis/AliasAnalysis.cpp
+++ b/llvm/lib/Analysis/AliasAnalysis.cpp
@@ -127,17 +127,18 @@ AliasAnalysis::getModRefBehavior(Function *F,
 
 AliasAnalysis::ModRefResult
 AliasAnalysis::getModRefInfo(CallSite CS, Value *P, unsigned Size) {
-  ModRefResult Mask = ModRef;
   ModRefBehavior MRB = getModRefBehavior(CS);
   if (MRB == DoesNotAccessMemory)
     return NoModRef;
-  else if (MRB == OnlyReadsMemory)
+  
+  ModRefResult Mask = ModRef;
+  if (MRB == OnlyReadsMemory)
     Mask = Ref;
   else if (MRB == AliasAnalysis::AccessesArguments) {
     bool doesAlias = false;
     for (CallSite::arg_iterator AI = CS.arg_begin(), AE = CS.arg_end();
          AI != AE; ++AI)
-      if (alias(*AI, ~0U, P, Size) != NoAlias) {
+      if (!isNoAlias(*AI, ~0U, P, Size)) {
         doesAlias = true;
         break;
       }