;;;; the RISC-V definitions of some general purpose memory reference VOPs
;;;; inherited by basic memory reference 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")

;;; Cell-Ref and Cell-Set are used to define VOPs like CAR, where the offset to
;;; be read or written is a property of the VOP used.

(define-vop (cell-ref)
  (:args (object :scs (descriptor-reg)))
  (:results (value :scs (descriptor-reg any-reg)))
  (:variant-vars offset lowtag)
  (:generator 4
    (loadw value object offset lowtag)))

(define-vop (cell-set)
  (:args (object :scs (descriptor-reg))
         (value :scs (descriptor-reg any-reg zero)))
  (:variant-vars offset lowtag)
  (:generator 4
    (storew value object offset lowtag)))

(define-vop (set-instance-hashed)
  (:args (object :scs (descriptor-reg)))
  (:temporary (:sc non-descriptor-reg) baseptr bit temp)
  (:generator 5
    (inst addi baseptr object (- instance-pointer-lowtag))
    (inst li bit (ash 1 stable-hash-required-flag))
    (inst amoor temp bit baseptr :aq :rl)))
