#| -*-Scheme-*-

$Id: coerce.scm,v 1.9 2007/01/05 21:19:22 cph Exp $
$MC68020-Header: coerce.scm,v 1.10 88/08/31 05:56:37 GMT cph Exp $

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    1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
    2006, 2007 Massachusetts Institute of Technology

This file is part of MIT/GNU Scheme.

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it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or (at
your option) any later version.

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WITHOUT ANY WARRANTY; without even the implied warranty of
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General Public License for more details.

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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301,
USA.

|#

;;;; Vax Specific Coercions

(declare (usual-integrations))

(define coerce-literal
  (standard-coercion
   (lambda (n)
     (if (<= 0 n 63)
	 n
	 (error "Bad short literal" n)))))

(define coerce-short-label
  (standard-coercion
   (lambda (offset)
     (or (if (negative? offset)
	     (and (>= offset -128) (+ offset 256))
	     (and (< offset 128) offset))
	 (error "Short label out of range" offset)))))

;; *** NOTE ***
;; If you add coercions here, remember to also add them in "insmac.scm".

(define make-coercion
  (coercion-maker
   `((UNSIGNED . ,coerce-unsigned-integer)
     (SIGNED . ,coerce-signed-integer))))

(define coerce-2-bit-unsigned (make-coercion 'UNSIGNED 2))
(define coerce-4-bit-unsigned (make-coercion 'UNSIGNED 4))
(define coerce-6-bit-unsigned (make-coercion 'UNSIGNED 6))
(define coerce-8-bit-unsigned (make-coercion 'UNSIGNED 8))
(define coerce-16-bit-unsigned (make-coercion 'UNSIGNED 16))
(define coerce-32-bit-unsigned (make-coercion 'UNSIGNED 32))

(define coerce-8-bit-signed (make-coercion 'SIGNED 8))
(define coerce-16-bit-signed (make-coercion 'SIGNED 16))
(define coerce-32-bit-signed (make-coercion 'SIGNED 32))

