Misc mid-level changes for new 'fence' instruction.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136205 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 14 insertions, 0 deletions

diff --git a/include/llvm/Analysis/AliasAnalysis.h b/include/llvm/Analysis/AliasAnalysis.h
index 2701b52..c86aa03 100644
--- a/include/llvm/Analysis/AliasAnalysis.h
+++ b/include/llvm/Analysis/AliasAnalysis.h
@@ -341,6 +341,7 @@ public:
     case Instruction::VAArg:  return getModRefInfo((const VAArgInst*)I, Loc);
     case Instruction::Load:   return getModRefInfo((const LoadInst*)I,  Loc);
     case Instruction::Store:  return getModRefInfo((const StoreInst*)I, Loc);
+    case Instruction::Fence:  return getModRefInfo((const FenceInst*)I, Loc);
     case Instruction::Call:   return getModRefInfo((const CallInst*)I,  Loc);
     case Instruction::Invoke: return getModRefInfo((const InvokeInst*)I,Loc);
     default:                  return NoModRef;
@@ -406,6 +407,19 @@ public:
     return getModRefInfo(S, Location(P, Size));
   }
 
+  /// getModRefInfo (for fences) - Return whether information about whether
+  /// a particular store modifies or reads the specified memory location.
+  ModRefResult getModRefInfo(const FenceInst *S, const Location &Loc) {
+    // Conservatively correct.  (We could possibly be a bit smarter if
+    // Loc is a alloca that doesn't escape.)
+    return ModRef;
+  }
+
+  /// getModRefInfo (for fences) - A convenience wrapper.
+  ModRefResult getModRefInfo(const FenceInst *S, const Value *P, uint64_t Size){
+    return getModRefInfo(S, Location(P, Size));
+  }
+
   /// getModRefInfo (for va_args) - Return whether information about whether
   /// a particular va_arg modifies or reads the specified memory location.
   ModRefResult getModRefInfo(const VAArgInst* I, const Location &Loc);