[NFC] Abstract out source argument index in MemTransferInst.

Summary:
 References to the source operand within class MemTransferInst are currently
by a constant 1. Abstract this out into a named constant.

llvm-svn: 322289

1 files changed, 7 insertions, 4 deletions

diff --git a/llvm/include/llvm/IR/IntrinsicInst.h b/llvm/include/llvm/IR/IntrinsicInst.h
index 2ca0a24cbae..c22200ba6b0 100644
--- a/llvm/include/llvm/IR/IntrinsicInst.h
+++ b/llvm/include/llvm/IR/IntrinsicInst.h
@@ -462,11 +462,14 @@ namespace llvm {
 
   /// This class wraps the llvm.memcpy/memmove intrinsics.
   class MemTransferInst : public MemIntrinsic {
+  private:
+    enum { ARG_SOURCE = 1 };
+
   public:
     /// Return the arguments to the instruction.
-    Value *getRawSource() const { return const_cast<Value*>(getArgOperand(1)); }
-    const Use &getRawSourceUse() const { return getArgOperandUse(1); }
-    Use &getRawSourceUse() { return getArgOperandUse(1); }
+    Value *getRawSource() const { return const_cast<Value*>(getArgOperand(ARG_SOURCE)); }
+    const Use &getRawSourceUse() const { return getArgOperandUse(ARG_SOURCE); }
+    Use &getRawSourceUse() { return getArgOperandUse(ARG_SOURCE); }
 
     /// This is just like getRawSource, but it strips off any cast
     /// instructions that feed it, giving the original input.  The returned
@@ -480,7 +483,7 @@ namespace llvm {
     void setSource(Value *Ptr) {
       assert(getRawSource()->getType() == Ptr->getType() &&
              "setSource called with pointer of wrong type!");
-      setArgOperand(1, Ptr);
+      setArgOperand(ARG_SOURCE, Ptr);
     }
 
     // Methods for support type inquiry through isa, cast, and dyn_cast: