re PR debug/43656 ("-fcompare-debug failure" with "-O2 -fschedule-insns…

re PR debug/43656 ("-fcompare-debug failure" with "-O2 -fschedule-insns -fsched-pressure -funroll-loops -fgraphite-identity")

PR debug/43656
* haifa-sched.c (setup_insn_reg_pressure_info,
update_register_pressure): Reject debug insns.
(ready_sort): Don't setup reg pressure for debug insns.
(schedule_insn): Don't update reg pressure for debug insns.

From-SVN: r160761

gcc/ChangeLog

+2010-06-14  Alexandre Oliva  <aoliva@redhat.com>
+
+	PR debug/43656
+	* haifa-sched.c (setup_insn_reg_pressure_info,
+	update_register_pressure): Reject debug insns.
+	(ready_sort): Don't setup reg pressure for debug insns.
+	(schedule_insn): Don't update reg pressure for debug insns.
+
 2010-06-14  Richard Guenther  <rguenther@suse.de>
 
 	* lto-streamer.c (cached_bp): Remove.

gcc/haifa-sched.c

@@ -1124,6 +1124,8 @@ setup_insn_reg_pressure_info (rtx insn)
   struct reg_use_data *use;
   static int death[N_REG_CLASSES];
 
+  gcc_checking_assert (!DEBUG_INSN_P (insn));
+
   excess_cost_change = 0;
   for (i = 0; i < ira_reg_class_cover_size; i++)
     death[ira_reg_class_cover[i]] = 0;
@@ -1500,7 +1502,8 @@ ready_sort (struct ready_list *ready)
   if (sched_pressure_p)
     {
       for (i = 0; i < ready->n_ready; i++)
-	setup_insn_reg_pressure_info (first[i]);
+	if (!DEBUG_INSN_P (first[i]))
+	  setup_insn_reg_pressure_info (first[i]);
     }
   SCHED_SORT (first, ready->n_ready);
 }
@@ -1564,6 +1567,8 @@ update_register_pressure (rtx insn)
   struct reg_use_data *use;
   struct reg_set_data *set;
 
+  gcc_checking_assert (!DEBUG_INSN_P (insn));
+
   for (use = INSN_REG_USE_LIST (insn); use != NULL; use = use->next_insn_use)
     if (dying_use_p (use) && bitmap_bit_p (curr_reg_live, use->regno))
       mark_regno_birth_or_death (use->regno, false);
@@ -1684,7 +1689,7 @@ schedule_insn (rtx insn)
       fputc ('\n', sched_dump);
     }
 
-  if (sched_pressure_p)
+  if (sched_pressure_p && !DEBUG_INSN_P (insn))
     update_reg_and_insn_max_reg_pressure (insn);
 
   /* Scheduling instruction should have all its dependencies resolved and