[PATCH,picochip] Fix for PR45299

[Hariharan Sandanagobalane <hariharans at picochip dot com>]

 Hello all,
The following change fixes PR45299 for picochip target. Committed to 
mainline as R163617.

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

Patch:

Index: gcc/config/picochip/picochip.c
===================================================================
--- gcc/config/picochip/picochip.c      (revision 163544)
+++ gcc/config/picochip/picochip.c      (working copy)
@@ -3138,40 +3138,68 @@
 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)
-       {
-         next = NEXT_INSN (insn);
+      /* 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;
+        }

-         if (NONDEBUG_INSN_P (insn))
-           {
-             /* Emit queued up notes before the first instruction of a 
bundle.  */
-             if (GET_MODE (insn) == TImode)
-               {
-                 while (queue)
-                   {
-                     rtx next_queue = PREV_INSN (queue);
-                     NEXT_INSN (PREV_INSN(insn)) = queue;
-                     PREV_INSN (queue) = PREV_INSN(insn);
-                     PREV_INSN (insn) = queue;
-                     NEXT_INSN (queue) = insn;
-                     queue = next_queue;
-                   }
-               }
-           }
-         else if (NOTE_P (insn) && NOTE_KIND (insn) == 
NOTE_INSN_VAR_LOCATION)
-           {
-              rtx prev = PREV_INSN (insn);
-              PREV_INSN (next) = prev;
-              NEXT_INSN (prev) = next;
+      /* 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 (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)
+                {
+                  while (queue)
+                    {
+                      rtx next_queue = PREV_INSN (queue);
+                      NEXT_INSN (PREV_INSN(insn)) = queue;
+                      PREV_INSN (queue) = PREV_INSN(insn);
+                      PREV_INSN (insn) = queue;
+                      NEXT_INSN (queue) = insn;
+                      queue = next_queue;
+                    }
+                }
+            }
+          else if (NOTE_P (insn) && NOTE_KIND (insn) == 
NOTE_INSN_VAR_LOCATION)
+            {
+               rtx prev = PREV_INSN (insn);
+               PREV_INSN (next) = prev;
+               NEXT_INSN (prev) = next;
                PREV_INSN (insn) = queue;
-              queue = insn;
-           }
-       }
+               queue = insn;
+            }
+        }
+        /* Make sure we are not dropping debug instructions.*/
+        gcc_assert (queue == NULL_RTX);
     }
 }