From: rakdver <rakdver@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Tue, 22 Mar 2005 22:08:53 +0000 (+0000)
Subject: 	* tree-ssa-loop-ivopts.c (determine_iv_cost): Do not try to preserve
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=a1b673caf38af231b55ce4d3c2e1c36ab2af5891;p=thirdparty%2Fgcc.git

	* tree-ssa-loop-ivopts.c (determine_iv_cost): Do not try to preserve
	artificial original candidates.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@96894 138bc75d-0d04-0410-961f-82ee72b054a4
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index a48a35e5a2e4..9d0a7ef44999 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2005-03-22  Zdenek Dvorak  <dvorakz@suse.cz>
+
+	* tree-ssa-loop-ivopts.c (determine_iv_cost): Do not try to preserve
+	artificial original candidates.
+
 2005-03-22  Richard Guenther <rguenth@tat.physik.uni-tuebingen.de>
 	    Jan Hubicka  <jh@suse.cz>
 	    Steven Bosscher <stevenb@suse.de
diff --git a/gcc/tree-ssa-loop-ivopts.c b/gcc/tree-ssa-loop-ivopts.c
index 877f5e45a037..2544fbc966a9 100644
--- a/gcc/tree-ssa-loop-ivopts.c
+++ b/gcc/tree-ssa-loop-ivopts.c
@@ -3681,8 +3681,11 @@ determine_iv_cost (struct ivopts_data *data, struct iv_cand *cand)
 
   cand->cost = cost_step + cost_base / AVG_LOOP_NITER (current_loop);
 
-  /* Prefer the original iv unless we may gain something by replacing it.  */
-  if (cand->pos == IP_ORIGINAL)
+  /* Prefer the original iv unless we may gain something by replacing it;
+     this is not really relevant for artificial ivs created by other
+     passes.  */
+  if (cand->pos == IP_ORIGINAL
+      && !DECL_ARTIFICIAL (SSA_NAME_VAR (cand->var_before)))
     cand->cost--;
   
   /* Prefer not to insert statements into latch unless there are some