diff options
| -rw-r--r-- | include/llvm/Analysis/AliasAnalysis.h | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/include/llvm/Analysis/AliasAnalysis.h b/include/llvm/Analysis/AliasAnalysis.h index b0e9b23ab1..9b5d8ff037 100644 --- a/include/llvm/Analysis/AliasAnalysis.h +++ b/include/llvm/Analysis/AliasAnalysis.h @@ -95,6 +95,11 @@ public: /// virtual void getMustAliases(Value *P, std::vector<Value*> &RetVals) {} + /// pointsToConstantMemory - If the specified pointer is known to point into + /// constant global memory, return true. This allows disambiguation of store + /// instructions from constant pointers. + /// + virtual bool pointsToConstantMemory(const Value *P) { return false; } //===--------------------------------------------------------------------===// /// Simple mod/ref information... @@ -114,7 +119,9 @@ public: /// pointer. /// virtual ModRefResult getModRefInfo(CallSite CS, Value *P, unsigned Size) { - return ModRef; + // If P points to a constant memory location, the call definitely could not + // modify the memory location. + return pointsToConstantMemory(P) ? Ref : ModRef; } /// getModRefInfo - Return information about whether two call sites may refer |