Don't trivially delete unused calls to llvm.invariant.start. This allows

llvm.invariant.start to be used without necessarily being paired with a call
to llvm.invariant.end.  If you run the entire optimization pipeline then such
calls are in fact deleted (adce does it), but that's actually a good thing since
we probably do want them to be zapped late in the game.  There should really be
an integration test that checks that the llvm.invariant.start call lasts long
enough that all passes that do interesting things with it get to do their stuff
before it is deleted.  But since no passes do anything interesting with it yet
this will have to wait for later.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86840 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 22 insertions, 0 deletions

diff --git a/include/llvm/IntrinsicInst.h b/include/llvm/IntrinsicInst.h
index 6a8f376392..1e1dca2eba 100644
--- a/include/llvm/IntrinsicInst.h
+++ b/include/llvm/IntrinsicInst.h
@@ -320,6 +320,28 @@ namespace llvm {
     }
   };
   
+  /// MemoryUseIntrinsic - This is the common base class for the memory use
+  /// marker intrinsics.
+  ///
+  struct MemoryUseIntrinsic : public IntrinsicInst {
+
+    // Methods for support type inquiry through isa, cast, and dyn_cast:
+    static inline bool classof(const MemoryUseIntrinsic *) { return true; }
+    static inline bool classof(const IntrinsicInst *I) {
+      switch (I->getIntrinsicID()) {
+      case Intrinsic::lifetime_start:
+      case Intrinsic::lifetime_end:
+      case Intrinsic::invariant_start:
+      case Intrinsic::invariant_end:
+        return true;
+      default: return false;
+      }
+    }
+    static inline bool classof(const Value *V) {
+      return isa<IntrinsicInst>(V) && classof(cast<IntrinsicInst>(V));
+    }
+  };
+
 }
 
 #endif