From f042068aab125f202a89108411cb0cbaa5486335 Mon Sep 17 00:00:00 2001
From: "Wolfgang (Blub) Bumiller" <blub@speed.at>
Date: Fri, 24 Aug 2012 15:06:30 +0200
Subject: [PATCH] ir_value_life_merge_into: fix a possible underflow

---
 ir.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/ir.c b/ir.c
index d2e1e0f..0be4d05 100644
--- a/ir.c
+++ b/ir.c
@@ -925,8 +925,8 @@ bool ir_value_life_merge_into(ir_value *self, const ir_value *other)
                 entry->start = life->start;
             }
 
-            if (life->end     >  entry->end &&
-                life->start-1 <= entry->end)
+            if (life->end   >  entry->end &&
+                life->start <= entry->end+1)
             {
                 /* ends later and overlaps */
                 entry->end = life->end;
-- 
2.39.2