* parse.c (parse_interface): Silence uninitialized var warning.

	* postreload-gcse.c (gate_handle_gcse2): Disable for functions
	optimized for speed.
	* final.c (compute_alignments): Use optimize_bb_for_size_p.
	* tree-call-cdce.c (gate_call_cdce): Use optimize_function_for_speed_p.
	* opts.c (flag_predictive_commoning_set, flag_unswitch_loops_set,
	flag_gcse_after_reload_set): New static vars.
	(common_handle_option): Enable those flags for profile-use.
	(decode_options): Remove optimize_size flags that are handled
	on higher granuality.
	* tree-vectorizer.c (vectorize_loops): Use
	optimize_loop_nest_for_speed_p.
	* tree-ssa-pre.c (do_pre): Use optimize_function_for_speed_p.
	* tree-predcom.c (tree_predictive_commoning): Use
	optimize_loop_for_speed_p.
	* varasm.c (assemble_start_function): Use optimize_function_for_speed_p.
	* bb-reorder.c (rest_of_handle_reorder_blocks): Likewise.
	* predict.c (optimize_loop_for_speed_p): Fix walk.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@139801 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 9 insertions, 1 deletions

diff --git a/gcc/bb-reorder.c b/gcc/bb-reorder.c
index 3bf2dc72c7e..b636c1e3a1d 100644
--- a/gcc/bb-reorder.c
+++ b/gcc/bb-reorder.c
@@ -2225,7 +2225,15 @@ rest_of_handle_reorder_blocks (void)
      splitting possibly introduced more crossjumping opportunities.  */
   cfg_layout_initialize (CLEANUP_EXPENSIVE);
 
-  if (flag_reorder_blocks || flag_reorder_blocks_and_partition)
+  if ((flag_reorder_blocks || flag_reorder_blocks_and_partition)
+      /* Don't reorder blocks when optimizing for size because extra jump insns may
+	 be created; also barrier may create extra padding.
+
+	 More correctly we should have a block reordering mode that tried to
+	 minimize the combined size of all the jumps.  This would more or less
+	 automatically remove extra jumps, but would also try to use more short
+	 jumps instead of long jumps.  */
+      && optimize_function_for_speed_p (cfun))
     {
       reorder_basic_blocks ();
       cleanup_cfg (CLEANUP_EXPENSIVE);