From: Dan Gohman <gohman@apple.com>
Date: Fri, 9 Apr 2010 18:20:03 +0000 (+0000)
Subject: Add a comment.
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=53b73a283e0a0339f7a273775ee21ebcc220b089;p=oota-llvm.git

Add a comment.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100874 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Analysis/ScalarEvolutionExpander.cpp b/lib/Analysis/ScalarEvolutionExpander.cpp
index dd8ab431f34..24825bf5e56 100644
--- a/lib/Analysis/ScalarEvolutionExpander.cpp
+++ b/lib/Analysis/ScalarEvolutionExpander.cpp
@@ -705,7 +705,8 @@ Value *SCEVExpander::visitAddExpr(const SCEVAddExpr *S) {
       Sum = expandAddToGEP(NewOps.begin(), NewOps.end(), PTy, Ty, Sum);
     } else if (const PointerType *PTy = dyn_cast<PointerType>(Op->getType())) {
       // The running sum is an integer, and there's a pointer at this level.
-      // Try to form a getelementptr.
+      // Try to form a getelementptr. Use a SCEVUnknown so that we don't
+      // re-analyze the instructions that we just emitted.
       SmallVector<const SCEV *, 4> NewOps;
       NewOps.push_back(SE.getUnknown(Sum));
       for (++I; I != E && I->first == CurLoop; ++I)