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+#| -*-Scheme-*-
+
+$Header: /Users/cph/tmp/foo/mit-scheme/mit-scheme/v7/src/compiler/machines/vax/coerce.scm,v 1.1 1987/07/28 18:26:43 jinx Exp $
+
+Copyright (c) 1987 Massachusetts Institute of Technology
+
+This material was developed by the Scheme project at the Massachusetts
+Institute of Technology, Department of Electrical Engineering and
+Computer Science.  Permission to copy this software, to redistribute
+it, and to use it for any purpose is granted, subject to the following
+restrictions and understandings.
+
+1. Any copy made of this software must include this copyright notice
+in full.
+
+2. Users of this software agree to make their best efforts (a) to
+return to the MIT Scheme project any improvements or extensions that
+they make, so that these may be included in future releases; and (b)
+to inform MIT of noteworthy uses of this software.
+
+3. All materials developed as a consequence of the use of this
+software shall duly acknowledge such use, in accordance with the usual
+standards of acknowledging credit in academic research.
+
+4. MIT has made no warrantee or representation that the operation of
+this software will be error-free, and MIT is under no obligation to
+provide any services, by way of maintenance, update, or otherwise.
+
+5. In conjunction with products arising from the use of this material,
+there shall be no use of the name of the Massachusetts Institute of
+Technology nor of any adaptation thereof in any advertising,
+promotional, or sales literature without prior written consent from
+MIT in each case. |#
+
+;;;; Vax Specific Coercions
+
+(declare (usual-integrations))
+\f
+(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)))))
+\f
+;; *** NOTE ***
+;; If you add coercions here, remember to also add them to
+;; EXPAND-DESCRIPTOR in isnmac.scm .
+
+(define make-coercion
+  (coercion-maker
+   `((UNSIGNED . ,coerce-unsigned-integer)
+     (SIGNED . ,coerce-signed-integer)
+     (LITERAL . ,coerce-literal)
+     (SHORT-LABEL . ,coerce-short-label))))
+
+(define-coercion 'UNSIGNED 1)
+(define-coercion 'UNSIGNED 2)
+(define-coercion 'UNSIGNED 3)
+(define-coercion 'UNSIGNED 4)
+(define-coercion 'UNSIGNED 5)
+(define-coercion 'UNSIGNED 6)
+(define-coercion 'UNSIGNED 7)
+(define-coercion 'UNSIGNED 8)
+(define-coercion 'UNSIGNED 9)
+(define-coercion 'UNSIGNED 10)
+(define-coercion 'UNSIGNED 11)
+(define-coercion 'UNSIGNED 12)
+(define-coercion 'UNSIGNED 13)
+(define-coercion 'UNSIGNED 14)
+(define-coercion 'UNSIGNED 15)
+(define-coercion 'UNSIGNED 16)
+(define-coercion 'UNSIGNED 32)
+
+(define-coercion 'SIGNED 8)
+(define-coercion 'SIGNED 16)
+(define-coercion 'SIGNED 32)
+
+(define-coercion 'LITERAL 8)
+(define-coercion 'SHORT-LABEL 8)
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