Extend the AliasAnalysis::pointsToConstantMemory interface to allow it

to optionally look for constant or local (alloca) memory.

Teach BasicAliasAnalysis::pointsToConstantMemory to look through Select
and Phi nodes, and to support looking for local memory.

Remove FunctionAttrs' PointsToLocalOrConstantMemory function, now that
AliasAnalysis knows all the tricks that it knew.

llvm-svn: 118412

1 files changed, 4 insertions, 1 deletions

diff --git a/llvm/lib/Analysis/NoAliasAnalysis.cpp b/llvm/lib/Analysis/NoAliasAnalysis.cpp
index 7602149edc0..ab7a69241e9 100644
--- a/llvm/lib/Analysis/NoAliasAnalysis.cpp
+++ b/llvm/lib/Analysis/NoAliasAnalysis.cpp
@@ -50,7 +50,10 @@ namespace {
       return UnknownModRefBehavior;
     }
 
-    virtual bool pointsToConstantMemory(const Location &Loc) { return false; }
+    virtual bool pointsToConstantMemory(const Location &Loc,
+                                        bool OrLocal) {
+      return false;
+    }
     virtual ModRefResult getModRefInfo(ImmutableCallSite CS,
                                        const Location &Loc) {
       return ModRef;