rtl.c (rtx_equal_p): Check for null pointers when comparing rtx strings.

	* rtl.c (rtx_equal_p): Check for null pointers when comparing rtx
	strings.

From-SVN: r47785

gcc/ChangeLog

+2001-12-08  John David Anglin  <dave@hiauly1.hia.nrc.ca>
+
+	* rtl.c (rtx_equal_p): Check for null pointers when comparing rtx
+	strings.
+
 2001-12-07  Richard Henderson  <rth@redhat.com>
 
 	* doc/extend.texi: Fix typo last change.

gcc/rtl.c

@@ -670,7 +670,9 @@ rtx_equal_p (x, y)
 
 	case 'S':
 	case 's':
-	  if (strcmp (XSTR (x, i), XSTR (y, i)))
+	  if ((XSTR (x, i) || XSTR (y, i))
+	      && (! XSTR (x, i) || ! XSTR (y, i)
+		  || strcmp (XSTR (x, i), XSTR (y, i))))
 	    return 0;
 	  break;