Add a 'Returned' intrinsic property corresponding to the 'returned' argument attribute

This will be used by the upcoming llvm.noalias intrinsic.

Differential Revision: http://reviews.llvm.org/D22201

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@275034 91177308-0d34-0410-b5e6-96231b3b80d8

4 files changed, 16 insertions, 1 deletions

diff --git a/include/llvm/IR/Intrinsics.td b/include/llvm/IR/Intrinsics.td
index e543ef56ef3..5ece731fa14 100644
--- a/include/llvm/IR/Intrinsics.td
+++ b/include/llvm/IR/Intrinsics.td
@@ -54,6 +54,12 @@ class NoCapture<int argNo> : IntrinsicProperty {
   int ArgNo = argNo;
 }
 
+// Returned - The specified argument is always the return value of the
+// intrinsic.
+class Returned<int argNo> : IntrinsicProperty {
+  int ArgNo = argNo;
+}
+
 // ReadOnly - The specified argument pointer is not written to through the
 // pointer by the intrinsic.
 class ReadOnly<int argNo> : IntrinsicProperty {
diff --git a/utils/TableGen/CodeGenIntrinsics.h b/utils/TableGen/CodeGenIntrinsics.h
index 1c82e05d1a5..76554a52a15 100644
--- a/utils/TableGen/CodeGenIntrinsics.h
+++ b/utils/TableGen/CodeGenIntrinsics.h
@@ -108,7 +108,7 @@ struct CodeGenIntrinsic {
   /// True if the intrinsic is marked as convergent.
   bool isConvergent;
 
-  enum ArgAttribute { NoCapture, ReadOnly, WriteOnly, ReadNone };
+  enum ArgAttribute { NoCapture, Returned, ReadOnly, WriteOnly, ReadNone };
   std::vector<std::pair<unsigned, ArgAttribute>> ArgumentAttributes;
 
   CodeGenIntrinsic(Record *R);
diff --git a/utils/TableGen/CodeGenTarget.cpp b/utils/TableGen/CodeGenTarget.cpp
index 1367e24bb2d..85fc4be901e 100644
--- a/utils/TableGen/CodeGenTarget.cpp
+++ b/utils/TableGen/CodeGenTarget.cpp
@@ -592,6 +592,9 @@ CodeGenIntrinsic::CodeGenIntrinsic(Record *R) {
     else if (Property->isSubClassOf("NoCapture")) {
       unsigned ArgNo = Property->getValueAsInt("ArgNo");
       ArgumentAttributes.push_back(std::make_pair(ArgNo, NoCapture));
+    } else if (Property->isSubClassOf("Returned")) {
+      unsigned ArgNo = Property->getValueAsInt("ArgNo");
+      ArgumentAttributes.push_back(std::make_pair(ArgNo, Returned));
     } else if (Property->isSubClassOf("ReadOnly")) {
       unsigned ArgNo = Property->getValueAsInt("ArgNo");
       ArgumentAttributes.push_back(std::make_pair(ArgNo, ReadOnly));
diff --git a/utils/TableGen/IntrinsicEmitter.cpp b/utils/TableGen/IntrinsicEmitter.cpp
index bee7fbf715b..062d25c6a4e 100644
--- a/utils/TableGen/IntrinsicEmitter.cpp
+++ b/utils/TableGen/IntrinsicEmitter.cpp
@@ -548,6 +548,12 @@ EmitAttributes(const std::vector<CodeGenIntrinsic> &Ints, raw_ostream &OS) {
             OS << "Attribute::NoCapture";
             addComma = true;
             break;
+          case CodeGenIntrinsic::Returned:
+            if (addComma)
+              OS << ",";
+            OS << "Attribute::Returned";
+            addComma = true;
+            break;
           case CodeGenIntrinsic::ReadOnly:
             if (addComma)
               OS << ",";