From: matz <matz@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Fri, 26 Nov 2010 16:51:39 +0000 (+0000)
Subject: 	* tree-ssa-copy.c (fini_copy_prop): Don't DCE when we have loops.
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=0d63aa16f49c5afb74d2572d84163c07d48874d8;p=thirdparty%2Fgcc.git

	* tree-ssa-copy.c (fini_copy_prop): Don't DCE when we have loops.

	* passes.c (init_optimization_passes): Remove superfluous
	copy-prop pass.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@167184 138bc75d-0d04-0410-961f-82ee72b054a4
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 810590c5e139..7e996ca0f50a 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,10 @@
+2010-11-26  Michael Matz  <matz@suse.de>
+
+	* tree-ssa-copy.c (fini_copy_prop): Don't DCE when we have loops.
+
+	* passes.c (init_optimization_passes): Remove superfluous
+	copy-prop pass.
+
 2010-11-26  Richard Guenther  <rguenther@suse.de>
 
 	PR lto/46648
diff --git a/gcc/passes.c b/gcc/passes.c
index b5cb2aca300a..38cc570a39df 100644
--- a/gcc/passes.c
+++ b/gcc/passes.c
@@ -897,7 +897,6 @@ init_optimization_passes (void)
 	  NEXT_PASS (pass_graphite);
 	    {
 	      struct opt_pass **p = &pass_graphite.pass.sub;
-	      NEXT_PASS (pass_copy_prop);
 	      NEXT_PASS (pass_graphite_transforms);
 	      NEXT_PASS (pass_copy_prop);
 	      NEXT_PASS (pass_dce_loop);
diff --git a/gcc/tree-ssa-copy.c b/gcc/tree-ssa-copy.c
index 68370336a76c..d552c3ab61ba 100644
--- a/gcc/tree-ssa-copy.c
+++ b/gcc/tree-ssa-copy.c
@@ -775,7 +775,9 @@ fini_copy_prop (void)
 	duplicate_ssa_name_ptr_info (copy_of[i].value, SSA_NAME_PTR_INFO (var));
     }
 
-  substitute_and_fold (get_value, NULL, true);
+  /* Don't do DCE if we have loops.  That's the simplest way to not
+     destroy the scev cache.  */
+  substitute_and_fold (get_value, NULL, !current_loops);
 
   free (copy_of);
 }