Generalize some alias analysis logic from atomic

intrinsics to any IntrWriteArgMem intrinsics.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@64551 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 36 insertions, 0 deletions

diff --git a/utils/TableGen/IntrinsicEmitter.cpp b/utils/TableGen/IntrinsicEmitter.cpp
index 53081ffb65..37fc6702ed 100644
--- a/utils/TableGen/IntrinsicEmitter.cpp
+++ b/utils/TableGen/IntrinsicEmitter.cpp
@@ -48,6 +48,9 @@ void IntrinsicEmitter::run(std::ostream &OS) {
   // Emit the intrinsic parameter attributes.
   EmitAttributes(Ints, OS);
 
+  // Emit intrinsic alias analysis mod/ref behavior.
+  EmitModRefBehavior(Ints, OS);
+
   // Emit a list of intrinsics with corresponding GCC builtins.
   EmitGCCBuiltinList(Ints, OS);
 
@@ -481,6 +484,37 @@ EmitAttributes(const std::vector<CodeGenIntrinsic> &Ints, std::ostream &OS) {
   OS << "#endif // GET_INTRINSIC_ATTRIBUTES\n\n";
 }
 
+/// EmitModRefBehavior - Determine intrinsic alias analysis mod/ref behavior.
+void IntrinsicEmitter::
+EmitModRefBehavior(const std::vector<CodeGenIntrinsic> &Ints, std::ostream &OS){
+  OS << "// Determine intrinsic alias analysis mod/ref behavior.\n";
+  OS << "#ifdef GET_INTRINSIC_MODREF_BEHAVIOR\n";
+  OS << "switch (id) {\n";
+  OS << "default:\n    return UnknownModRefBehavior;\n";
+  for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
+    if (Ints[i].ModRef == CodeGenIntrinsic::WriteMem)
+      continue;
+    OS << "case " << TargetPrefix << "Intrinsic::" << Ints[i].EnumName
+      << ":\n";
+    switch (Ints[i].ModRef) {
+    default:
+      assert(false && "Unknown Mod/Ref type!");
+    case CodeGenIntrinsic::NoMem:
+      OS << "  return DoesNotAccessMemory;\n";
+      break;
+    case CodeGenIntrinsic::ReadArgMem:
+    case CodeGenIntrinsic::ReadMem:
+      OS << "  return OnlyReadsMemory;\n";
+      break;
+    case CodeGenIntrinsic::WriteArgMem:
+      OS << "  return AccessesArguments;\n";
+      break;
+    }
+  }
+  OS << "}\n";
+  OS << "#endif // GET_INTRINSIC_MODREF_BEHAVIOR\n\n";
+}
+
 void IntrinsicEmitter::
 EmitGCCBuiltinList(const std::vector<CodeGenIntrinsic> &Ints, std::ostream &OS){
   OS << "// Get the GCC builtin that corresponds to an LLVM intrinsic.\n";
diff --git a/utils/TableGen/IntrinsicEmitter.h b/utils/TableGen/IntrinsicEmitter.h
index 0f3f0e72b6..4a169ffd64 100644
--- a/utils/TableGen/IntrinsicEmitter.h
+++ b/utils/TableGen/IntrinsicEmitter.h
@@ -42,6 +42,8 @@ namespace llvm {
                        std::ostream &OS);
     void EmitAttributes(const std::vector<CodeGenIntrinsic> &Ints,
                         std::ostream &OS);
+    void EmitModRefBehavior(const std::vector<CodeGenIntrinsic> &Ints,
+                            std::ostream &OS);
     void EmitGCCBuiltinList(const std::vector<CodeGenIntrinsic> &Ints, 
                             std::ostream &OS);
     void EmitIntrinsicToGCCBuiltinMap(const std::vector<CodeGenIntrinsic> &Ints,