Add the load/x instruction for bit selects.

vvp/opcodes.txt

@@ -1,7 +1,7 @@
 /*
  * Copyright (c) 2001 Stephen Williams ([email protected])
  *
- *  $Id: opcodes.txt,v 1.26 2001/07/19 04:40:55 steve Exp $
+ *  $Id: opcodes.txt,v 1.27 2001/07/22 00:04:50 steve Exp $
  */
 
 
@@ -233,6 +233,14 @@ Bit address zero is the LSB of the first memory word.  This
 instruction loads only a single bit.
 
 
+* %load/x <bit>, <functor-label>, <idx>
+
+This is an indexed load. It uses the contents of the specified index
+register to select a bit from an array based at <functor-label>. The
+bit is pulled from the addressed functor and loaded into the
+destination bit. This function does not do any bounds checking.
+
+
 * %mod <bit-l>, <bit-r>, <wid>