From: Dan Gohman <gohman@apple.com>
Date: Sun, 29 Aug 2010 15:07:13 +0000 (+0000)
Subject: Micro-optimize GroupByComplexity.
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=c6a8e99fb34f039d5e410409f21cc03802059e59;p=oota-llvm.git

Micro-optimize GroupByComplexity.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112431 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Analysis/ScalarEvolution.cpp b/lib/Analysis/ScalarEvolution.cpp
index 176de3a2b9e..863f8a65409 100644
--- a/lib/Analysis/ScalarEvolution.cpp
+++ b/lib/Analysis/ScalarEvolution.cpp
@@ -704,8 +704,9 @@ static void GroupByComplexity(SmallVectorImpl<const SCEV *> &Ops,
   if (Ops.size() == 2) {
     // This is the common case, which also happens to be trivially simple.
     // Special case it.
-    if (SCEVComplexityCompare(LI)(Ops[1], Ops[0]))
-      std::swap(Ops[0], Ops[1]);
+    const SCEV *&LHS = Ops[0], *&RHS = Ops[1];
+    if (SCEVComplexityCompare(LI)(RHS, LHS))
+      std::swap(LHS, RHS);
     return;
   }