From 58818c530fe22c31e52556c0ac17a7d19626e245 Mon Sep 17 00:00:00 2001
From: Devang Patel <dpatel@apple.com>
Date: Fri, 9 Mar 2007 21:19:53 +0000
Subject: [PATCH] Increment iterator now because IVUseShouldUsePostIncValue may
 remove User from the list of I users.

llvm-svn: 35051
---
 llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp b/llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp
index fcbf9e301cfe..ec3fed2f1bab 100644
--- a/llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp
+++ b/llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp
@@ -400,10 +400,14 @@ bool LoopStrengthReduce::AddUsersIfInteresting(Instruction *I, Loop *L,
   SCEVHandle Stride = Start;
   if (!getSCEVStartAndStride(ISE, L, Start, Stride))
     return false;  // Non-reducible symbolic expression, bail out.
-  
-  for (Value::use_iterator UI = I->use_begin(), E = I->use_end(); UI != E;++UI){
+
+  for (Value::use_iterator UI = I->use_begin(), E = I->use_end(); UI != E;) {
     Instruction *User = cast<Instruction>(*UI);
 
+    // Increment iterator now because IVUseShouldUsePostIncValue may remove 
+    // User from the list of I users.
+    ++UI;
+
     // Do not infinitely recurse on PHI nodes.
     if (isa<PHINode>(User) && Processed.count(User))
       continue;