From b818d1a93426c89deaeea9273e1fa400b5890c0e Mon Sep 17 00:00:00 2001
From: rakdver <rakdver@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Tue, 24 Jan 2006 23:37:25 +0000
Subject: [PATCH] * loop-iv.c (iv_analysis_loop_init): Use df analysis
in a more efficient way.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@110188 138bc75d-0d04-0410-961f-82ee72b054a4
---
gcc/ChangeLog | 5 +++++
gcc/loop-iv.c | 13 ++++++++-----
2 files changed, 13 insertions(+), 5 deletions(-)
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++)
{
--
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