src/compiler/hppa/memory.lisp

   1 (in-package "SB!VM")
   2
   3 ;;; Cell-Ref and Cell-Set are used to define VOPs like CAR, where the offset to
   4 ;;; be read or written is a property of the VOP used.  Cell-Setf is similar to
   5 ;;; Cell-Set, but delivers the new value as the result.  Cell-Setf-Function
   6 ;;; takes its arguments as if it were a setf function (new value first, as
   7 ;;; apposed to a setf macro, which takes the new value last).
   8 ;;;
   9 (define-vop (cell-ref)
  10   (:args (object :scs (descriptor-reg)))
  11   (:results (value :scs (descriptor-reg any-reg)))
  12   (:variant-vars offset lowtag)
  13   (:policy :fast-safe)
  14   (:generator 4
  15     (loadw value object offset lowtag)))
  16 ;;;
  17 (define-vop (cell-set)
  18   (:args (object :scs (descriptor-reg))
  19          (value :scs (descriptor-reg any-reg)))
  20   (:variant-vars offset lowtag)
  21   (:policy :fast-safe)
  22   (:generator 1
  23     (storew value object offset lowtag)))
  24
  25 ;;; Slot-Ref and Slot-Set are used to define VOPs like Closure-Ref, where the
  26 ;;; offset is constant at compile time, but varies for different uses.  We add
  27 ;;; in the stardard g-vector overhead.
  28 ;;;
  29 (define-vop (slot-ref)
  30   (:args (object :scs (descriptor-reg)))
  31   (:results (value :scs (descriptor-reg any-reg)))
  32   (:variant-vars base lowtag)
  33   (:info offset)
  34   (:generator 4
  35     (loadw value object (+ base offset) lowtag)))
  36 ;;;
  37 (define-vop (slot-set)
  38   (:args (object :scs (descriptor-reg))
  39          (value :scs (descriptor-reg any-reg)))
  40   (:variant-vars base lowtag)
  41   (:info offset)
  42   (:generator 1
  43     (storew value object (+ base offset) lowtag)))
  44