src/compiler/alpha/memory.lisp

   1 ;;;; the Alpha definitions of some general purpose memory reference
   2 ;;;; VOPs inherited by basic memory reference operations
   3
   4 ;;;; This software is part of the SBCL system. See the README file for
   5 ;;;; more information.
   6 ;;;;
   7 ;;;; This software is derived from the CMU CL system, which was
   8 ;;;; written at Carnegie Mellon University and released into the
   9 ;;;; public domain. The software is in the public domain and is
  10 ;;;; provided with absolutely no warranty. See the COPYING and CREDITS
  11 ;;;; files for more information.
  12
  13 (in-package "SB!VM")
  14
  15 ;;; Cell-Ref and Cell-Set are used to define VOPs like CAR, where the
  16 ;;; offset to be read or written is a property of the VOP used.
  17 (define-vop (cell-ref)
  18   (:args (object :scs (descriptor-reg)))
  19   (:results (value :scs (descriptor-reg any-reg)))
  20   (:variant-vars offset lowtag)
  21   (:policy :fast-safe)
  22   (:generator 4
  23     (loadw value object offset lowtag)))
  24 (define-vop (cell-set)
  25   (:args (object :scs (descriptor-reg))
  26          (value :scs (descriptor-reg any-reg null zero)))
  27   (:variant-vars offset lowtag)
  28   (:policy :fast-safe)
  29   (:generator 4
  30     (storew value object offset lowtag)))
  31
  32 ;;; Slot-Ref and Slot-Set are used to define VOPs like Closure-Ref,
  33 ;;; where the offset is constant at compile time, but varies for
  34 ;;; different uses. We add in the stardard g-vector overhead.
  35 (define-vop (slot-ref)
  36   (:args (object :scs (descriptor-reg)))
  37   (:results (value :scs (descriptor-reg any-reg)))
  38   (:variant-vars base lowtag)
  39   (:info offset)
  40   (:generator 4
  41     (loadw value object (+ base offset) lowtag)))
  42 (define-vop (slot-set)
  43   (:args (object :scs (descriptor-reg))
  44          (value :scs (descriptor-reg any-reg null zero)))
  45   (:variant-vars base lowtag)
  46   (:info offset)
  47   (:generator 4
  48     (storew value object (+ base offset) lowtag)))