From: Andrew Trick <atrick@apple.com>
Date: Fri, 21 Jun 2013 18:33:09 +0000 (+0000)
Subject: Modify the -join-globalcopies option (off by default).
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=0db6df0d963a8eee763fd878a72c3153501491c0;p=oota-llvm.git

Modify the -join-globalcopies option (off by default).

Always coalesce in forward order to propagate rematerialization.
I'm fixing this option so I can enable it by default soon.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@184568 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/CodeGen/RegisterCoalescer.cpp b/lib/CodeGen/RegisterCoalescer.cpp
index 3cede9f4907..6e7d90dd65c 100644
--- a/lib/CodeGen/RegisterCoalescer.cpp
+++ b/lib/CodeGen/RegisterCoalescer.cpp
@@ -2117,8 +2117,8 @@ RegisterCoalescer::copyCoalesceInMBB(MachineBasicBlock *MBB) {
     // are not inherently easier to resolve, but slightly preferable until we
     // have local live range splitting. In particular this is required by
     // cmp+jmp macro fusion.
-    for (MachineBasicBlock::reverse_iterator
-           MII = MBB->rbegin(), E = MBB->rend(); MII != E; ++MII) {
+    for (MachineBasicBlock::iterator MII = MBB->begin(), E = MBB->end();
+         MII != E; ++MII) {
       if (!MII->isCopyLike())
         continue;
       if (isLocalCopy(&(*MII), LIS))