re PR rtl-optimization/38740 (Incorrect delayed branch optimization)

	PR rtl-optimization/38740
	* reorg.c (gate_handle_delay_slots): Avoid dbr scheduling
	if !optimize.
	* config/mips/mips.c (mips_reorg): Likewise.

From-SVN: r143733

gcc/ChangeLog

+2009-01-28  Jakub Jelinek  <jakub@redhat.com>
+
+	PR rtl-optimization/38740
+	* reorg.c (gate_handle_delay_slots): Avoid dbr scheduling
+	if !optimize.
+	* config/mips/mips.c (mips_reorg): Likewise.
+
 2009-01-28  Richard Guenther  <rguenther@suse.de>
 
 	PR tree-optimization/38926

gcc/config/mips/mips.c

@@ -13296,7 +13296,7 @@ mips_reorg (void)
   mips16_lay_out_constants ();
   if (mips_r10k_cache_barrier != R10K_CACHE_BARRIER_NONE)
     r10k_insert_cache_barriers ();
-  if (flag_delayed_branch)
+  if (optimize > 0 && flag_delayed_branch)
     dbr_schedule (get_insns ());
   mips_reorg_process_insns ();
   if (!TARGET_MIPS16

gcc/reorg.c

@@ -4046,7 +4046,8 @@ static bool
 gate_handle_delay_slots (void)
 {
 #ifdef DELAY_SLOTS
-  return flag_delayed_branch && !crtl->dbr_scheduled_p;
+  /* At -O0 dataflow info isn't updated after RA.  */
+  return optimize > 0 && flag_delayed_branch && !crtl->dbr_scheduled_p;
 #else
   return 0;
 #endif