From: Benjamin Kramer <benny.kra@googlemail.com>
Date: Sun, 27 May 2012 09:44:52 +0000 (+0000)
Subject: SDAGBuilder: Avoid iterator invalidation harder.
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=dc54f8ebe288c7313e22902d4bdfe030e479db48;p=oota-llvm.git

SDAGBuilder: Avoid iterator invalidation harder.

vector.begin()-1 is invalid too.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@157525 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
index f8cbcaa0d65..1330a262139 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
@@ -1991,7 +1991,7 @@ bool SelectionDAGBuilder::handleSmallSwitchRange(CaseRec& CR,
     // The last case block won't fall through into 'NextBlock' if we emit the
     // branches in this order.  See if rearranging a case value would help.
     // We start at the bottom as it's the case with the least weight.
-    for (CaseItr I = CR.Range.second-2, E = CR.Range.first-1; I != E; --I) {
+    for (CaseItr I = CR.Range.second-2, E = CR.Range.first; I >= E; --I) {
       if (I->BB == NextBlock) {
         std::swap(*I, BackCase);
         break;