From: Jan Hubicka <jh@suse.cz>
Date: Sun, 31 Aug 2008 15:54:54 +0000 (+0200)
Subject: tree-ssa-loop-unswitch.c (tree_unswitch_single_loop): Check that loop is optimized... 
X-Git-Tag: releases/gcc-4.4.0~2743
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=079990a2bffd576c7f8a3f375e8f02be2bc00306;p=thirdparty%2Fgcc.git

tree-ssa-loop-unswitch.c (tree_unswitch_single_loop): Check that loop is optimized for speed.


	* tree-ssa-loop-unswitch.c (tree_unswitch_single_loop): Check that
	loop is optimized for speed.

From-SVN: r139834
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 72a46cfefab6..e046003da7a5 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2008-08-31  Jan Hubicka  <jh@suse.cz>
+
+	* tree-ssa-loop-unswitch.c (tree_unswitch_single_loop): Check that
+	loop is optimized for speed.
+
 2008-08-31  Richard Guenther  <rguenther@suse.de>
 
 	PR middle-end/37289
diff --git a/gcc/tree-ssa-loop-unswitch.c b/gcc/tree-ssa-loop-unswitch.c
index 850270f49c03..26abed2dd8fd 100644
--- a/gcc/tree-ssa-loop-unswitch.c
+++ b/gcc/tree-ssa-loop-unswitch.c
@@ -198,6 +198,14 @@ tree_unswitch_single_loop (struct loop *loop, int num)
       return false;
     }
 
+  /* Do not unswitch in cold regions.  */
+  if (optimize_loop_for_size_p (loop))
+    {
+      if (dump_file && (dump_flags & TDF_DETAILS))
+	fprintf (dump_file, ";; Not unswitching cold loops\n");
+      return false;
+    }
+
   /* The loop should not be too large, to limit code growth.  */
   if (tree_num_loop_insns (loop, &eni_size_weights)
       > (unsigned) PARAM_VALUE (PARAM_MAX_UNSWITCH_INSNS))