explow.c (hard_function_value): Add comment explaining signed/unsigned comparison.

2002-02-12  Eric Christopher  <echristo@redhat.com>

	* explow.c (hard_function_value): Add comment explaining
	signed/unsigned comparison.

From-SVN: r49714

gcc/ChangeLog

+2002-02-12  Eric Christopher  <echristo@redhat.com>
+
+	* explow.c (hard_function_value): Add comment explaining
+	signed/unsigned comparison.
+
 2002-02-12  Jakub Jelinek  <jakub@redhat.com>
 
 	* jump.c (never_reached_warning): Add finish argument.

gcc/explow.c

@@ -1603,6 +1603,10 @@ hard_function_value (valtype, func, outgoing)
       unsigned HOST_WIDE_INT bytes = int_size_in_bytes (valtype);
       enum machine_mode tmpmode;
 
+      /* int_size_in_bytes can return -1.  We don't need a check here
+	 since the value of bytes will be large enough that no mode
+	 will match and we will abort later in this function.  */
+
       for (tmpmode = GET_CLASS_NARROWEST_MODE (MODE_INT);
            tmpmode != VOIDmode;
            tmpmode = GET_MODE_WIDER_MODE (tmpmode))