Add words C@- C!- and MOVE-

blk/050

@@ -6,12 +6,11 @@ Memory
 +!       n a --          Increase value of addr a by n
 C@       a -- c          Set c to byte at address a
 C@+      a -- a+1 c      Fetch c from a and inc a.
+C@-      a -- a-1 c      Fetch c from a and dec a.
 C!       c a --          Store byte c in address a
 C!+      c a -- a+1      Store byte c in a and inc a.
+C!-      c a -- a-1      Store byte c in a and dec a.
 CURRENT  -- a            Set a to wordref of last added entry.
 CURRENT* -- a            A pointer to active CURRENT*. Useful
                          when we have multiple active dicts.
-FILL     a n b --        Fill n bytes at addr a with val b.
-HERE     -- a            Push HERE's address
-H@       -- a            HERE @
                                                         (cont.)

blk/051

@@ -1,2 +1,7 @@
+FILL     a n b --        Fill n bytes at addr a with val b.
+HERE     -- a            Push HERE's address
+H@       -- a            HERE @
 MOVE     a1 a2 u --      Copy u bytes from a1 to a2, starting
                          with a1, going up.
+MOVE-    a1 a2 u --      Copy u bytes from a1 to a2, starting
+                         with a1+u, going down.

blk/394

@@ -1,12 +1,6 @@
 : ABORT (resSP) QUIT ;
-
+: = CMP NOT ; : < CMP -1 = ; : > CMP 1 = ;
-: = CMP NOT ;
+: 0< 32767 > ; : >= < NOT ; : <= > NOT ; : 0>= 0< NOT ;
-: < CMP -1 = ;
-: > CMP 1 = ;
-: 0< 32767 > ;
-: >= < NOT ;
-: <= > NOT ;
-: 0>= 0< NOT ;
 ( n l h -- f )
 : >< 2 PICK > ( n l f ) ROT ROT > AND ;
 : =><= 2 PICK >= ( n l f ) ROT ROT >= AND ;
@@ -14,3 +8,7 @@
 : C@+ DUP C@ SWAP 1+ SWAP ;
 ( c a -- a+1 )
 : C!+ SWAP OVER C! 1+ ;
+( a -- a-1 c )
+: C@- DUP C@ SWAP 1- SWAP ;
+( c a -- a-1 )
+: C!- SWAP OVER C! 1- ;

blk/434

@@ -1,9 +1,13 @@
 : MOVE ( a1 a2 u -- )
-    ( u ) 0 DO
+    ( u ) 0 DO ( a1 a2 )
-        SWAP DUP I + C@   ( a2 a1 x )
+        SWAP C@+ ( a2 a1+1 x )
-        ROT SWAP OVER I + ( a1 a2 x a2 )
+        ROT C!+ ( a1+1 a2+1 )
-        C!                ( a1 a2 )
+    LOOP 2DROP ;
-    LOOP
+: MOVE- ( a1 a2 u -- )
-    2DROP
+    SWAP OVER + 1- ( a1 u a2+u-1 )
-;
+    ROT 2 PICK + 1- ( u a2+u-1 a1+u-1 )
+    ROT ( u ) 0 DO ( a2 a1 )
+        C@- ( a2 a1-1 x )
+        ROT C!- ( a1-1 a2-1 ) SWAP ( a2 a1 )
+    LOOP 2DROP ;
 : PREV 3 - DUP @ - ;