From: Jan Hubicka <jh@suse.cz>
Date: Thu, 16 Oct 2008 01:29:14 +0000 (+0200)
Subject: ira-emit.c (change_regs): Return false when replacing reg by itself.
X-Git-Tag: releases/gcc-4.4.0~2031
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=c39a4ad7a8e2e494432980bdaff5d4b378b50bb2;p=thirdparty%2Fgcc.git

ira-emit.c (change_regs): Return false when replacing reg by itself.

2008-10-15  Jan Hubicka  <jh@suse.cz>

	* ira-emit.c (change_regs): Return false when replacing reg by
	itself.

From-SVN: r141163
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index ccdc92ed9867..c3d2d9f1d453 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2008-10-15  Jan Hubicka  <jh@suse.cz>
+
+	* ira-emit.c (change_regs): Return false when replacing reg by
+	itself.
+
 2008-10-14  Vladimir Makarov  <vmakarov@redhat.com>
 
 	PR target/37633
diff --git a/gcc/ira-emit.c b/gcc/ira-emit.c
index 7fdaefb52e54..a6a7582f519a 100644
--- a/gcc/ira-emit.c
+++ b/gcc/ira-emit.c
@@ -137,6 +137,7 @@ change_regs (rtx *loc)
   int i, regno, result = false;
   const char *fmt;
   enum rtx_code code;
+  rtx reg;
 
   if (*loc == NULL_RTX)
     return false;
@@ -151,7 +152,10 @@ change_regs (rtx *loc)
 	return false;
       if (ira_curr_regno_allocno_map[regno] == NULL)
 	return false;
-      *loc = ALLOCNO_REG (ira_curr_regno_allocno_map[regno]);
+      reg = ALLOCNO_REG (ira_curr_regno_allocno_map[regno]);
+      if (reg == *loc)
+	return false;
+      *loc = reg;
       return true;
     }