flow.c (merge_blocks_nomove): Be more careful about locating the beginning of block A.

        * flow.c (merge_blocks_nomove): Be more careful about
        locating the beginning of block A.

From-SVN: r35623

gcc/ChangeLog

 2000-08-11  Richard Henderson  <rth@cygnus.com>
 
+	* flow.c (merge_blocks_nomove): Be more careful about
+	locating the beginning of block A.
+
 	* combine.c (simplify_shift_const): Obey SHIFT_COUNT_TRUNCATED.
 
 Thu Aug 10 22:47:09 2000  Ovidiu Predescu  <ovidiu@cup.hp.com>

gcc/flow.c

@@ -2211,9 +2211,9 @@ merge_blocks_nomove (a, b)
     {
       rtx prev;
 
-      prev = prev_nonnote_insn (a_end);
-      if (!prev) 
-	prev = a->head;
+      for (prev = PREV_INSN (a_end); ; prev = PREV_INSN (prev))
+	if (GET_CODE (prev) != NOTE || prev == a->head)
+	  break;
 
       del_first = a_end;