.pg
.x loop
.x continue
.x break
.x end
.lt
------------------------------------------------------------------------
LOOP
  CONTINUE
  ...
  BREAK
END
------------------------------------------------------------------------
.el
.b 3
The LOOP macro begins a iterative control structure.
.b
The BREAK macro will generate code to branch to the next instruction after the
corrensponding END macro. The BREAK macro is optional. 
.b
The CONTINUE macro will generate code to branch to the instruction just before
the corrensponding END macro.  The CONTINUE macro is optional.
.b
The END macro generates a branch back to the corresponding LOOP macro and also
generates the appropriate label for the BREAK macro. For every LOOP macro
specified, a corresponding END macro must also be specified. 
.b
The WHILE macro, the REPEAT-UNTIL macro and the REPEAT-FOREVER macro are
implemented using the LOOP and IF macros. 
.b
The default branch displacement for LOOP is WORD (see BRANCH).
.b
For example:
.b
.lt
		loop
		  statements-1
		end
.el
.b
will generate the following code
.b
.lt
	20000$:
		statements-1
		brw	20000$
	20001$:
.el
.b
See also WHILE and REPEAT