From 8feba6612e24a14434021be5f4982506b7d7d250 Mon Sep 17 00:00:00 2001
From: rakdver <rakdver@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Mon, 11 Jul 2005 23:59:17 +0000
Subject: 	* tree-flow.h (remove_empty_loops, single_dom_exit): Declare. 
 * passes.c (init_optimization_passes): Add pass_empty_loop. 	* tree-pass.h
 (pass_empty_loop): Declare. 	* tree-ssa-loop-ivcanon.c (empty_loop_p,
 remove_empty_loop, 	try_remove_empty_loop, remove_empty_loops): New
 functions. 	* tree-ssa-loop-ivopts.c (single_dom_exit): Export. 	*
 tree-ssa-loop.c (tree_ssa_empty_loop, pass_empty_loop): New.

	* gcc.dg/tree-ssa/loop-10.c: New test.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@101901 138bc75d-0d04-0410-961f-82ee72b054a4
---
 gcc/tree-ssa-loop.c | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

(limited to 'gcc/tree-ssa-loop.c')

diff --git a/gcc/tree-ssa-loop.c b/gcc/tree-ssa-loop.c
index aa99920f88b..1e7d73b8885 100644
--- a/gcc/tree-ssa-loop.c
+++ b/gcc/tree-ssa-loop.c
@@ -311,6 +311,34 @@ struct tree_opt_pass pass_scev_cprop =
   0					/* letter */
 };
 
+/* Remove empty loops.  */
+
+static void
+tree_ssa_empty_loop (void)
+{
+  if (!current_loops)
+    return;
+
+  remove_empty_loops (current_loops);
+}
+
+struct tree_opt_pass pass_empty_loop =
+{
+  "empty",				/* name */
+  NULL,					/* gate */
+  tree_ssa_empty_loop,		       	/* execute */
+  NULL,					/* sub */
+  NULL,					/* next */
+  0,					/* static_pass_number */
+  TV_COMPLETE_UNROLL,	  		/* tv_id */
+  PROP_cfg | PROP_ssa,			/* properties_required */
+  0,					/* properties_provided */
+  0,					/* properties_destroyed */
+  0,					/* todo_flags_start */
+  TODO_dump_func | TODO_verify_loops,	/* todo_flags_finish */
+  0					/* letter */
+};
+
 /* Record bounds on numbers of iterations of loops.  */
 
 static void
-- 
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