From c8d0dd1bd4c903f650c90fe700848bb13d3e9057 Mon Sep 17 00:00:00 2001
From: Evan Cheng <evan.cheng@apple.com>
Date: Tue, 23 Mar 2010 15:50:49 +0000
Subject: [PATCH] Add comment.

llvm-svn: 99284
---
 llvm/include/llvm/Transforms/Utils/BuildLibCalls.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/llvm/include/llvm/Transforms/Utils/BuildLibCalls.h b/llvm/include/llvm/Transforms/Utils/BuildLibCalls.h
index 9b76a37a85c3..d278672a1f02 100644
--- a/llvm/include/llvm/Transforms/Utils/BuildLibCalls.h
+++ b/llvm/include/llvm/Transforms/Utils/BuildLibCalls.h
@@ -49,6 +49,9 @@ namespace llvm {
   Value *EmitMemCpy(Value *Dst, Value *Src, Value *Len,
                     unsigned Align, IRBuilder<> &B, const TargetData *TD);
 
+  /// EmitMemCpyChk - Emit a call to the __memcpy_chk function to the builder.
+  /// This expects that the Len and ObjSize have type 'intptr_t' and Dst/Src
+  /// are pointers.
   Value *EmitMemCpyChk(Value *Dst, Value *Src, Value *Len, Value *ObjSize,
                        IRBuilder<> &B, const TargetData *TD);