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[pf3gnuchains/gcc-fork.git] / gcc / tree-ssa-loop-unswitch.c

diff --git a/gcc/tree-ssa-loop-unswitch.c b/gcc/tree-ssa-loop-unswitch.c
index 850270f..5b9ba90 100644 (file)
--- a/gcc/tree-ssa-loop-unswitch.c
+++ b/gcc/tree-ssa-loop-unswitch.c
@@ -1,18 +1,18 @@
 /* Loop unswitching.
-   Copyright (C) 2004, 2005, 2007 Free Software Foundation, Inc.
-   
+   Copyright (C) 2004, 2005, 2007, 2008 Free Software Foundation, Inc.
+
 This file is part of GCC.
-   
+
 GCC is free software; you can redistribute it and/or modify it
 under the terms of the GNU General Public License as published by the
 Free Software Foundation; either version 3, or (at your option) any
 later version.
-   
+
 GCC is distributed in the hope that it will be useful, but WITHOUT
 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 for more details.
-   
+
 You should have received a copy of the GNU General Public License
 along with GCC; see the file COPYING3.  If not see
 <http://www.gnu.org/licenses/>.  */
@@ -32,7 +32,6 @@ along with GCC; see the file COPYING3.  If not see
 #include "tree-dump.h"
 #include "timevar.h"
 #include "cfgloop.h"
-#include "domwalk.h"
 #include "params.h"
 #include "tree-pass.h"
 #include "tree-inline.h"
@@ -198,6 +197,14 @@ 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))
@@ -209,7 +216,7 @@ tree_unswitch_single_loop (struct loop *loop, int num)
 
   i = 0;
   bbs = get_loop_body (loop);
-  
+
   while (1)
     {
       /* Find a bb to unswitch on.  */
@@ -287,7 +294,7 @@ tree_unswitch_loop (struct loop *loop,
 
   extract_true_false_edges_from_block (unswitch_on, &edge_true, &edge_false);
   prob_true = edge_true->probability;
-  return loop_version (loop, unshare_expr (cond), 
+  return loop_version (loop, unshare_expr (cond),
                       NULL, prob_true, prob_true,
                       REG_BR_PROB_BASE - prob_true, false);
 }