From: Dan Gohman <dan433584@gmail.com>
Date: Thu, 31 Jan 2013 02:45:26 +0000 (+0000)
Subject: Add a comment.
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=36fa8398f5a6d8857f8a51c41337008f288cb333;p=platform%2Fupstream%2Fllvm.git

Add a comment.

llvm-svn: 174028
---

diff --git a/llvm/lib/Analysis/InstructionSimplify.cpp b/llvm/lib/Analysis/InstructionSimplify.cpp
index 9f2aa59..18d90b6 100644
--- a/llvm/lib/Analysis/InstructionSimplify.cpp
+++ b/llvm/lib/Analysis/InstructionSimplify.cpp
@@ -663,6 +663,10 @@ Value *llvm::SimplifyAddInst(Value *Op0, Value *Op1, bool isNSW, bool isNUW,
 /// accumulates the total constant offset applied in the returned constant. It
 /// returns 0 if V is not a pointer, and returns the constant '0' if there are
 /// no constant offsets applied.
+///
+/// This is very similar to GetPointerBaseWithConstantOffset except it doesn't
+/// follow non-inbounds geps. This allows it to remain usable for icmp ult/etc.
+/// folding.
 static Constant *stripAndComputeConstantOffsets(const DataLayout &TD,
                                                 Value *&V) {
   assert(V->getType()->isPointerTy());