re PR target/45299 (Dwarf information is wrong with optimised code.)

        * config/picochip/picochip.c (reorder_var_tracking_notes): This
          function was dropping debug insns which caused PR45299.

From-SVN: r163617

gcc/ChangeLog

-2010-08-28  Uros Bizjak  <ubizjak@gmail.com>
+2010-08-28  Hariharan Sandanagobalane <hariharan@picochip.com>
+
+	* config/picochip/picochip.c (reorder_var_tracking_notes): This
+	function was dropping debug insns which caused PR45299.
 
+2010-08-28  Uros Bizjak  <ubizjak@gmail.com>
 	* config/i386/sse.md (extsuffix): New code attribute.
 	(sse4_1_<code>v8qiv8hi2): Macroize insn from sse4_1_extendv8qiv8hi2
 	and sse4_1_zero_extendv8qiv8hi2 using any_extend code iterator.

gcc/config/picochip/picochip.c

@@ -3138,16 +3138,42 @@ static void
 reorder_var_tracking_notes (void)
 {
   basic_block bb;
+
   FOR_EACH_BB (bb)
     {
-      rtx insn, next;
+      rtx insn, next, last_insn = NULL_RTX;
+      rtx vliw_start = NULL_RTX;
       rtx queue = NULL_RTX;
 
-      for (insn = BB_HEAD (bb); insn != BB_END (bb); insn = next)
+      /* Iterate through the bb and find the last non-debug insn */
+      for (insn = BB_HEAD (bb); insn != NEXT_INSN(BB_END (bb)); insn = NEXT_INSN(insn))
+        {
+          if (NONDEBUG_INSN_P(insn))
+            last_insn = insn;
+        }
+
+      /* In all normal cases, queue up notes and emit them just before a TImode
+         instruction. For the last instruction, emit the queued notes just after
+         the last instruction. */
+      for (insn = BB_HEAD (bb); insn != NEXT_INSN(BB_END (bb)); insn = next)
         {
           next = NEXT_INSN (insn);
 
-	  if (NONDEBUG_INSN_P (insn))
+          if (insn == last_insn)
+            {
+              while (queue)
+                {
+                  rtx next_queue = PREV_INSN (queue);
+                  PREV_INSN (NEXT_INSN(insn)) = queue;
+                  NEXT_INSN(queue) = NEXT_INSN(insn);
+                  PREV_INSN(queue) = insn;
+                  NEXT_INSN(insn) = queue;
+                  queue = next_queue;
+                }
+              /* There is no more to do for this bb. break*/
+              break;
+            }
+          else if (NONDEBUG_INSN_P (insn))
             {
               /* Emit queued up notes before the first instruction of a bundle.  */
               if (GET_MODE (insn) == TImode)
@@ -3172,6 +3198,8 @@ reorder_var_tracking_notes (void)
                queue = insn;
             }
         }
+        /* Make sure we are not dropping debug instructions.*/
+        gcc_assert (queue == NULL_RTX);
     }
 }