From: Jakob Stoklund Olesen <stoklund@2pi.dk>
Date: Sat, 19 May 2012 23:59:27 +0000 (+0000)
Subject: Simplify overlap check.
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=a991ea5f7f2df661dc1ad7bd230d3a401dfb6411;p=oota-llvm.git

Simplify overlap check.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@157137 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/CodeGen/RegisterCoalescer.cpp b/lib/CodeGen/RegisterCoalescer.cpp
index ca5d2807397..7831906c620 100644
--- a/lib/CodeGen/RegisterCoalescer.cpp
+++ b/lib/CodeGen/RegisterCoalescer.cpp
@@ -1397,15 +1397,8 @@ bool RegisterCoalescer::joinIntervals(CoalescerPair &CP) {
 
   while (I != IE && J != JE) {
     // Determine if these two live ranges overlap.
-    bool Overlaps;
-    if (I->start < J->start) {
-      Overlaps = I->end > J->start;
-    } else {
-      Overlaps = J->end > I->start;
-    }
-
     // If so, check value # info to determine if they are really different.
-    if (Overlaps) {
+    if (I->end > J->start && J->end > I->start) {
       // If the live range overlap will map to the same value number in the
       // result liverange, we can still coalesce them.  If not, we can't.
       if (LHSValNoAssignments[I->valno->id] !=