* recog.c (validate_replace_rtx_1): Do not abort for (nil) expression.

From-SVN: r35368

gcc/ChangeLog

+Mon Jul 31 10:36:38 MET DST 2000 Jan Hubicka  <jh@suse.cz>
+
+	* recog.c (validate_replace_rtx_1): Do not abort for (nil) expression.
+
 2000-07-31  Geoff Keating  <geoffk@cygnus.com>
 
 	* c-parse.in (extdefs): Call ggc_collect between external

gcc/recog.c

@@ -409,8 +409,11 @@ validate_replace_rtx_1 (loc, from, to, object)
   register int i, j;
   register const char *fmt;
   register rtx x = *loc;
-  enum rtx_code code = GET_CODE (x);
+  enum rtx_code code;
 
+  if (!x)
+    return;
+  code = GET_CODE (x);
   /* X matches FROM if it is the same rtx or they are both referring to the
      same register in the same mode.  Avoid calling rtx_equal_p unless the
      operands look similar.  */