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

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
7faaba28 · Zdenek Dvorak · Zdenek Dvorak · 801a91f9 · 7faaba28 · 7faaba28
Commit 7faaba28 authored Jan 25, 2006 by Zdenek Dvorak Committed by Zdenek Dvorak Jan 24, 2006
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gcc/ChangeLog
+5 -0

gcc/loop-iv.c
+8 -5

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--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
+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

--- 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++)
    {