-;;; -*- Package: VM; Log: C.Log -*-
-;;;
-;;; **********************************************************************
-;;; This code was written as part of the CMU Common Lisp project at
-;;; Carnegie Mellon University, and has been placed in the public domain.
-;;;
-
-;;;
-;;; **********************************************************************
-;;;
-;;; This file contains the Alpha VM definition of SAP operations.
-;;;
-;;; Written by William Lott.
-;;; Alpha conversion by Sean Hallgren.
-;;;
-(in-package "SB!VM")
+;;;; the Alpha VM definition of SAP operations
+;;;; This software is part of the SBCL system. See the README file for
+;;;; more information.
+;;;;
+;;;; This software is derived from the CMU CL system, which was
+;;;; written at Carnegie Mellon University and released into the
+;;;; public domain. The software is in the public domain and is
+;;;; provided with absolutely no warranty. See the COPYING and CREDITS
+;;;; files for more information.
+(in-package "SB!VM")
\f
-;;;; Moves and coercions:
+;;;; moves and coercions
;;; Move a tagged SAP to an untagged representation.
-;;;
-
(define-vop (move-to-sap)
(:args (x :scs (descriptor-reg)))
(:results (y :scs (sap-reg)))
(:note "system area pointer indirection")
(:generator 1
(loadq y x sap-pointer-slot other-pointer-type)))
-
-;;;
(define-move-vop move-to-sap :move
(descriptor-reg) (sap-reg))
-
;;; Move an untagged SAP to a tagged representation.
-;;;
(define-vop (move-from-sap)
(:args (x :scs (sap-reg) :target sap))
(:temporary (:scs (sap-reg) :from (:argument 0)) sap)
(move x sap)
(with-fixed-allocation (y ndescr sap-type sap-size)
(storeq sap y sap-pointer-slot other-pointer-type))))
-;;;
(define-move-vop move-from-sap :move
(sap-reg) (descriptor-reg))
-
-;;; Move untagged sap values.
-;;;
+;;; Move untagged SAP values.
(define-vop (sap-move)
(:args (x :target y
:scs (sap-reg)
(:affected)
(:generator 0
(move x y)))
-;;;
(define-move-vop sap-move :move
(sap-reg) (sap-reg))
-
-;;; Move untagged sap arguments/return-values.
-;;;
+;;; Move untagged SAP arguments/return-values.
(define-vop (move-sap-argument)
(:args (x :target y
:scs (sap-reg))
(move x y))
(sap-stack
(storeq x fp (tn-offset y))))))
-;;;
(define-move-vop move-sap-argument :move-argument
(descriptor-reg sap-reg) (sap-reg))
-
;;; Use standard MOVE-ARGUMENT + coercion to move an untagged sap to a
;;; descriptor passing location.
-;;;
(define-move-vop move-argument :move-argument
(sap-reg) (descriptor-reg))
-
-
\f
;;;; SAP-INT and INT-SAP
(:policy :fast-safe)
(:generator 1
(move int sap)))
-
-
\f
;;;; POINTER+ and POINTER-
(:result-types signed-num)
(:generator 1
(inst subq ptr1 ptr2 res)))
-
\f
;;;; mumble-SYSTEM-REF and mumble-SYSTEM-SET
single-reg single-float :single)
(def-system-ref-and-set sap-ref-double %set-sap-ref-double
double-reg double-float :double))
-
\f
-;;; Noise to convert normal lisp data objects into SAPs.
+;;; noise to convert normal Lisp data objects into SAPs
(define-vop (vector-sap)
(:translate vector-sap)