Skip DEBUG_INSNs while recognizing doloop

From-SVN: r173647

gcc/ChangeLog

 2011-05-11  Revital Eres  <revital.eres@linaro.org>
 
+	* modulo-sched.c (doloop_register_get): Ignore DEBUG_INSNs while
+	recognizing doloop.
+
+2011-05-11  Revital Eres  <revital.eres@linaro.org>
+
 	* loop-doloop.c (doloop_condition_get): Use prev_nondebug_insn
 	instead of PREV_INSN.
 

gcc/modulo-sched.c

@@ -310,10 +310,10 @@ doloop_register_get (rtx head ATTRIBUTE_UNUSED, rtx tail ATTRIBUTE_UNUSED)
      either a single (parallel) branch-on-count or a (non-parallel)
      branch immediately preceded by a single (decrement) insn.  */
   first_insn_not_to_check = (GET_CODE (PATTERN (tail)) == PARALLEL ? tail
-                             : PREV_INSN (tail));
+                             : prev_nondebug_insn (tail));
 
   for (insn = head; insn != first_insn_not_to_check; insn = NEXT_INSN (insn))
-    if (reg_mentioned_p (reg, insn))
+    if (reg_mentioned_p (reg, insn) && !DEBUG_INSN_P (insn))
       {
         if (dump_file)
         {