From 568ea92489f883094c12b8be33c6b1ec05017bf0 Mon Sep 17 00:00:00 2001
From: Alon Zakai <alonzakai@gmail.com>
Date: Mon, 16 May 2016 15:41:30 -0700
Subject: optimize adding new conflicts from merged starts

---
 src/passes/CoalesceLocals.cpp | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

(limited to 'src')

diff --git a/src/passes/CoalesceLocals.cpp b/src/passes/CoalesceLocals.cpp
index edcc9d1db..3805d7280 100644
--- a/src/passes/CoalesceLocals.cpp
+++ b/src/passes/CoalesceLocals.cpp
@@ -314,9 +314,10 @@ bool CoalesceLocals::mergeStartsAndCheckChange(std::vector<BasicBlock*>& blocks,
   // this is not a new conflict.
   if (ret == old) return false;
   // add conflicts
-  for (auto i : ret) {
-    for (auto j : ret) {
-      interfere(i, j);
+  size_t size = ret.size();
+  for (size_t i = 0; i < size; i++) {
+    for (size_t j = i + 1; j < size; j++) {
+      interfere(ret[i], ret[j]);
     }
   }
   return true;
-- 
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