loop.c (check_dbra_loop): Make sure initial value is a CONST_INT before trying to normalize it.

	* loop.c (check_dbra_loop): Make sure initial value is a
	CONST_INT before trying to normalize it.

From-SVN: r17352

gcc/ChangeLog

+Wed Jan 14 01:26:05 1998  Jeffrey A Law  (law@cygnus.com)
+
+	* loop.c (check_dbra_loop): Make sure initial value is a 
+	CONST_INT before trying to normalize it.
+
 Tue Jan 13 23:27:54 1998  Robert Lipe   (robertl@dgii.com)
 
 	* sco5.h (ASM_OUTPUT_SECTION_NAME): Refresh from ../svr4.h.

gcc/loop.c

@@ -6214,10 +6214,11 @@ check_dbra_loop (loop_end, insn_count, loop_start)
 	      comparison_val = INTVAL (XEXP (comparison, 1));
 	      initial_value = bl->initial_value;
 		
-	      /* Normalize the initial value if it has no other use
-		 except as a counter.  This will allow a few more loops
-		 to be reversed.  */
-	      if (no_use_except_counting)
+	      /* Normalize the initial value if it is an integer and 
+		 has no other use except as a counter.  This will allow
+		 a few more loops to be reversed.  */
+	      if (no_use_except_counting
+		  && GET_CODE (initial_value) == CONST_INT)
 		{
 		  comparison_val = comparison_val - INTVAL (bl->initial_value);
 		  initial_value = const0_rtx;