re PR rtl-optimization/44404 (auto-inc-dec generates an invalid assembly instruction)

	PR rtl-optimization/44404
	* auto-inc-dec.c (find_inc): Avoid calling count_occurrences if
	possible, use reg_overlap_mentioned_p instead.

From-SVN: r161920

gcc/ChangeLog

+2010-07-07  Bernd Schmidt  <bernds@codesourcery.com>
+
+	PR rtl-optimization/44404
+	* auto-inc-dec.c (find_inc): Avoid calling count_occurrences if
+	possible, use reg_overlap_mentioned_p instead.
+
 2010-07-07  Duncan Sands  <baldrick@free.fr>
 
 	PR middle-end/41355

gcc/auto-inc-dec.c

@@ -1068,14 +1068,7 @@ find_inc (bool first_try)
       /* For the post_add to work, the result_reg of the inc must not be
 	 used in the mem insn since this will become the new index
 	 register.  */
-      if (count_occurrences (PATTERN (mem_insn.insn), inc_insn.reg_res, 1) == 0
-	  && reg_overlap_mentioned_p (inc_insn.reg_res, PATTERN (mem_insn.insn)))
-	{
-	  debug_rtx (mem_insn.insn);
-	  debug_rtx (inc_insn.reg_res);
-	  gcc_unreachable ();
-	}
-      if (count_occurrences (PATTERN (mem_insn.insn), inc_insn.reg_res, 1) != 0)
+      if (reg_overlap_mentioned_p (inc_insn.reg_res, PATTERN (mem_insn.insn)))
 	{
 	  if (dump_file)
 	    fprintf (dump_file, "base reg replacement failure.\n");