From: Zdenek Dvorak <dvorakz@suse.cz>
Date: Tue, 24 Jan 2006 23:37:25 +0000 (+0100)
Subject: loop-iv.c (iv_analysis_loop_init): Use df analysis in a more efficient way.
X-Git-Tag: releases/gcc-4.2.0~4631
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=7faaba2884bb256dc3e2c9addd5357fbde4e2c9c;p=thirdparty%2Fgcc.git

loop-iv.c (iv_analysis_loop_init): Use df analysis in a more efficient way.

	* loop-iv.c (iv_analysis_loop_init): Use df analysis in a more
	efficient way.

From-SVN: r110188
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 7e12f30159e2..6614b548b2a7 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2006-01-25  Zdenek Dvorak <dvorakz@suse.cz>
+
+	* loop-iv.c (iv_analysis_loop_init): Use df analysis in a more
+	efficient way.
+
 2006-01-24  DJ Delorie  <dj@redhat.com>
 
 	* expmed.c (store_bit_field): Don't arbitrarily deny using insv
diff --git a/gcc/loop-iv.c b/gcc/loop-iv.c
index 0321faa58e81..e3ec78b7cfcb 100644
--- a/gcc/loop-iv.c
+++ b/gcc/loop-iv.c
@@ -250,11 +250,14 @@ iv_analysis_loop_init (struct loop *loop)
   current_loop = loop;
 
   /* Clear the information from the analysis of the previous loop.  */
-  if (!first_time)
-    iv_analysis_done ();
-  df = df_init (DF_HARD_REGS | DF_EQUIV_NOTES);
-  df_chain_add_problem (df, DF_UD_CHAIN);
-  bivs = htab_create (10, biv_hash, biv_eq, free);
+  if (first_time)
+    {
+      df = df_init (DF_HARD_REGS | DF_EQUIV_NOTES);
+      df_chain_add_problem (df, DF_UD_CHAIN);
+      bivs = htab_create (10, biv_hash, biv_eq, free);
+    }
+  else
+    clear_iv_info ();
 
   for (i = 0; i < loop->num_nodes; i++)
     {