From: Dan Gohman <gohman@apple.com>
Date: Mon, 24 Jan 2011 17:54:18 +0000 (+0000)
Subject: Add a comment.
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=a3bbf2411fa1e085fc371e2c9ef27970e2c89d3c;p=oota-llvm.git

Add a comment.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124126 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Analysis/ScalarEvolution.cpp b/lib/Analysis/ScalarEvolution.cpp
index e3fcb8428e8..c10af50dd59 100644
--- a/lib/Analysis/ScalarEvolution.cpp
+++ b/lib/Analysis/ScalarEvolution.cpp
@@ -3126,6 +3126,7 @@ ScalarEvolution::getUnsignedRange(const SCEV *S) {
 ///
 ConstantRange
 ScalarEvolution::getSignedRange(const SCEV *S) {
+  // See if we've computed this range already.
   DenseMap<const SCEV *, ConstantRange>::iterator I = SignedRanges.find(S);
   if (I != SignedRanges.end())
     return I->second;