re PR debug/61923 (-fcompare-debug errors while building Linux kernel.)

2014-08-06  Vladimir Makarov  <vmakarov@redhat.com>

	PR debug/61923
	* haifa-sched.c (advance_one_cycle): Fix dump.
	(schedule_block): Don't advance cycle if we are already at the
	beginning of the cycle.

2014-08-06  Vladimir Makarov  <vmakarov@redhat.com>

	PR debug/61923
	* gcc.target/i386/pr61923.c: New test.

From-SVN: r213675

gcc/ChangeLog

+2014-08-06  Vladimir Makarov  <vmakarov@redhat.com>
+
+	PR debug/61923
+	* haifa-sched.c (advance_one_cycle): Fix dump.
+	(schedule_block): Don't advance cycle if we are already at the
+	beginning of the cycle.
+
 2014-08-06  Martin Jambor  <mjambor@suse.cz>
 
 	PR ipa/61393

gcc/haifa-sched.c

@@ -2970,7 +2970,7 @@ advance_one_cycle (void)
 {
   advance_state (curr_state);
   if (sched_verbose >= 4)
-    fprintf (sched_dump, ";;\tAdvanced a state.\n");
+    fprintf (sched_dump, ";;\tAdvance the current state.\n");
 }
 
 /* Update register pressure after scheduling INSN.  */
@@ -6052,6 +6052,7 @@ schedule_block (basic_block *target_bb, state_t init_state)
   modulo_insns_scheduled = 0;
 
   ls.modulo_epilogue = false;
+  ls.first_cycle_insn_p = true;
 
   /* Loop until all the insns in BB are scheduled.  */
   while ((*current_sched_info->schedule_more_p) ())
@@ -6122,7 +6123,6 @@ schedule_block (basic_block *target_bb, state_t init_state)
       if (must_backtrack)
 	goto do_backtrack;
 
-      ls.first_cycle_insn_p = true;
       ls.shadows_only_p = false;
       cycle_issued_insns = 0;
       ls.can_issue_more = issue_rate;
@@ -6409,10 +6409,12 @@ schedule_block (basic_block *target_bb, state_t init_state)
 	      break;
 	    }
 	}
+      ls.first_cycle_insn_p = true;
     }
   if (ls.modulo_epilogue)
     success = true;
  end_schedule:
+  if (!ls.first_cycle_insn_p)
     advance_one_cycle ();
   perform_replacements_new_cycle ();
   if (modulo_ii > 0)

gcc/testsuite/ChangeLog

+2014-08-06  Vladimir Makarov  <vmakarov@redhat.com>
+
+	PR debug/61923
+	* gcc.target/i386/pr61923.c: New test.
+
 2014-08-06  Alan Lawrence  <alan.lawrence@arm.com>
 
 	* gcc.target/aarch64/vdup_n_2.c: New test.

gcc/testsuite/gcc.target/i386/pr61923.c

+/* PR debug/61923 */
+/* { dg-do compile } */
+/* { dg-options "-O2 -fcompare-debug" } */
+
+typedef struct
+{
+  struct
+  {
+    struct
+    {
+      char head;
+    } tickets;
+  };
+} arch_spinlock_t;
+struct ext4_map_blocks
+{
+  int m_lblk;
+  int m_len;
+  int m_flags;
+};
+int ext4_da_map_blocks_ei_0;
+void fn1 (int p1, struct ext4_map_blocks *p2)
+{
+  int ret;
+  if (p2->m_flags)
+    {
+      ext4_da_map_blocks_ei_0++;
+      arch_spinlock_t *lock;
+      switch (sizeof *&lock->tickets.head)
+      case 1:
+      asm("" : "+m"(*&lock->tickets.head) : ""(0));
+      __asm__("");
+      ret = 0;
+    }
+  fn2 (p2->m_lblk, p2->m_len);
+}