Initial check-in for LIAR version 4...

diff --git a/v7/src/compiler/machines/vax/rgspcm.scm b/v7/src/compiler/machines/vax/rgspcm.scm
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+#| -*-Scheme-*-
+
+$Header: /Users/cph/tmp/foo/mit-scheme/mit-scheme/v7/src/compiler/machines/vax/rgspcm.scm,v 4.1 1988/02/23 19:43:56 bal 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. |#
+
+;;;; RTL Generation: Special primitive combinations.  68020 version.
+
+(declare (usual-integrations))
+\f
+(define (define-special-primitive-handler name handler)
+  (let ((primitive (make-primitive-procedure name true)))
+    (let ((entry (assq primitive special-primitive-handlers)))
+      (if entry
+         (set-cdr! entry handler)
+         (set! special-primitive-handlers
+               (cons (cons primitive handler)
+                     special-primitive-handlers)))))
+  name)
+
+(define (special-primitive-handler primitive)
+  (let ((entry (assq primitive special-primitive-handlers)))
+    (and entry
+        (cdr entry))))
+
+(define special-primitive-handlers
+  '())
+
+(define (define-special-primitive/standard primitive)
+  (define-special-primitive-handler primitive
+    rtl:make-invocation:special-primitive))
+
+(define-special-primitive/standard '&+)
+(define-special-primitive/standard '&-)
+(define-special-primitive/standard '&*)
+(define-special-primitive/standard '&/)
+(define-special-primitive/standard '&=)
+(define-special-primitive/standard '&<)
+(define-special-primitive/standard '&>)
+(define-special-primitive/standard '1+)
+(define-special-primitive/standard '-1+)
+(define-special-primitive/standard 'zero?)
+(define-special-primitive/standard 'positive?)
+(define-special-primitive/standard 'negative?)
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