From 89f8f30f3565328a2805adafd22e05219b56d562 Mon Sep 17 00:00:00 2001
From: Zdenek Dvorak <dvorakz@suse.cz>
Date: Tue, 6 Feb 2007 22:49:49 +0100
Subject: loop.texi: Document possibility not to perform disambiguation of
 loops with multiple latches.

	* doc/loop.texi: Document possibility not to perform disambiguation
	of loops with multiple latches.
	* cfgloopmanip.c (alp_enum_p): Removed.
	(add_loop): Handle subloops.  Use get_loop_body_with_size.
	(create_preheader): Do not allow ENTRY_BLOCK_PTR to be preheader.
	* cfghooks.c (redirect_edge_and_branch_force): Set dominator for
	the new forwarder block.
	(make_forwarder_block): Only call new_bb_cbk if it is not NULL.
	Handle the case latch is NULL.
	* tree-ssa-dom.c (tree_ssa_dominator_optimize): Avoid cfg modifications
	when marking loop exits.
	* ifcvt.c (if_convert): Ditto.  Mark loop exits even if cfg cannot
	be modified.
	* loop-init.c (loop_optimizer_init): Do not modify cfg.  Call
	disambiguate_loops_with_multiple_latches.
	* tree-cfgcleanup.c (cleanup_tree_cfg_loop): Calculate dominators
	before fix_loop_structure.
	* cfgloop.c: Include pointer-set.h and output.h.
	(canonicalize_loop_headers, HEADER_BLOCK, LATCH_EDGE,
	update_latch_info, mfb_keep_just, mfb_keep_nonlatch): Removed.
	(get_loop_latch_edges, find_subloop_latch_edge_by_profile,
	find_subloop_latch_edge_by_ivs, find_subloop_latch_edge,
	mfb_redirect_edges_in_set, form_subloop, merge_latch_edges,
	disambiguate_multiple_latches, get_loop_body_with_size,
	disambiguate_loops_with_multiple_latches): New functions.
	(flow_loop_dump): Dump multiple latch edges.
	(flow_loop_nodes_find): Handle loops with multiple latches.
	(flow_loops_find): Ditto. Do not call canonicalize_loop_headers.
	(glb_enum_p): Modified.
	(get_loop_body): Use get_loop_body_with_size.
	* cfgloop.h (LOOPS_HAVE_RECORDED_EXITS): New flag.
	(AVOID_CFG_MODIFICATIONS): New constant.
	(disambiguate_loops_with_multiple_latches, add_loop,
	get_loop_body_with_size): Declare.
	* Makefile.in (cfgloop.o): Add pointer-set.h and output.h.

	* gcc.dg/tree-ssa/loop-25.c: New test.

From-SVN: r121670
---
 gcc/ifcvt.c | 15 +++++----------
 1 file changed, 5 insertions(+), 10 deletions(-)

(limited to 'gcc/ifcvt.c')

diff --git a/gcc/ifcvt.c b/gcc/ifcvt.c
index bbd349d..9df57bb 100644
--- a/gcc/ifcvt.c
+++ b/gcc/ifcvt.c
@@ -3908,18 +3908,13 @@ if_convert (int x_life_data_ok)
   num_true_changes = 0;
   life_data_ok = (x_life_data_ok != 0);
 
-  if ((! targetm.cannot_modify_jumps_p ())
-      && (!flag_reorder_blocks_and_partition || !no_new_pseudos
-	  || !targetm.have_named_sections))
+  loop_optimizer_init (AVOID_CFG_MODIFICATIONS);
+  if (current_loops)
     {
-      loop_optimizer_init (0);
-      if (current_loops)
-	{
-	  mark_loop_exit_edges ();
-	  loop_optimizer_finalize ();
-	}
-      free_dominance_info (CDI_DOMINATORS);
+      mark_loop_exit_edges ();
+      loop_optimizer_finalize ();
     }
+  free_dominance_info (CDI_DOMINATORS);
 
   /* Compute postdominators if we think we'll use them.  */
   if (HAVE_conditional_execution || life_data_ok)
-- 
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