md.texi (Machine Constraints): Document stormy's Z constraint.

* doc/md.texi (Machine Constraints): Document stormy's Z
constraint.

From-SVN: r67729

gcc/ChangeLog

+2003-06-10  DJ Delorie  <dj@redhat.com>
+
+	* doc/md.texi (Machine Constraints): Document stormy's Z
+	constraint.
+
 2003-06-10  Geoffrey Keating  <geoffk@apple.com>
 
 	* except.c (call_site_base): Mark with GTY.

gcc/doc/md.texi

@@ -2271,6 +2271,9 @@ The register indicated by Rx (not implemented yet).
 @item U
 A constant that is not between 2 and 15 inclusive.
 
+@item Z
+The constant 0.
+
 @end table
 
 @item Xtensa---@file{xtensa.h}