;;;; various primitive memory access VOPs for the x86 VM

;;;; 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")

;;;; data object ref/set stuff

(define-vop (slot)
  (:args (object :scs (descriptor-reg)))
  (:info name offset lowtag)
  (:ignore name)
  (:results (result :scs (descriptor-reg any-reg)))
  (:generator 1
    (loadw result object offset lowtag)))

(define-vop (set-slot)
  (:args (object :scs (descriptor-reg))
         (value :scs (descriptor-reg any-reg immediate)))
  (:info name offset lowtag)
  (:ignore name)
  (:results)
  (:generator 1
     (if (sc-is value immediate)
        (let ((val (tn-value value)))
           (etypecase val
              (integer
               (inst mov
                     (make-ea :dword :base object
                              :disp (- (* offset n-word-bytes) lowtag))
                     (fixnumize val)))
              (symbol
               (inst mov
                     (make-ea :dword :base object
                              :disp (- (* offset n-word-bytes) lowtag))
                     (+ nil-value (static-symbol-offset val))))
              (character
               (inst mov
                     (make-ea :dword :base object
                              :disp (- (* offset n-word-bytes) lowtag))
                     (logior (ash (char-code val) n-widetag-bits)
                             character-widetag)))))
       ;; Else, value not immediate.
       (storew value object offset lowtag))))



;;;; symbol hacking VOPs

;;; these next two cf the sparc version, by jrd.
;;; FIXME: Deref this ^ reference.


;;; The compiler likes to be able to directly SET symbols.
#!+sb-thread
(define-vop (set)
  (:args (symbol :scs (descriptor-reg))
         (value :scs (descriptor-reg any-reg)))
  (:temporary (:sc descriptor-reg) tls)
  ;;(:policy :fast-safe)
  (:generator 4
    (let ((global-val (gen-label))
          (done (gen-label)))
      (loadw tls symbol symbol-tls-index-slot other-pointer-lowtag)
      (inst or tls tls)
      (inst jmp :z global-val)
      (inst fs-segment-prefix)
      (inst cmp (make-ea :dword :base tls) no-tls-value-marker-widetag)
      (inst jmp :z global-val)
      (inst fs-segment-prefix)
      (inst mov (make-ea :dword :base tls) value)
      (inst jmp done)
      (emit-label global-val)
      (storew value symbol symbol-value-slot other-pointer-lowtag)
      (emit-label done))))

;; unithreaded it's a lot simpler ...
#!-sb-thread
(define-vop (set cell-set)
  (:variant symbol-value-slot other-pointer-lowtag))

;;; Do a cell ref with an error check for being unbound.
;;; XXX stil used? I can't see where -dan
(define-vop (checked-cell-ref)
  (:args (object :scs (descriptor-reg) :target obj-temp))
  (:results (value :scs (descriptor-reg any-reg)))
  (:policy :fast-safe)
  (:vop-var vop)
  (:save-p :compute-only)
  (:temporary (:sc descriptor-reg :from (:argument 0)) obj-temp))

;;; With Symbol-Value, we check that the value isn't the trap object. So
;;; Symbol-Value of NIL is NIL.
#!+sb-thread
(define-vop (symbol-value)
  (:translate symbol-value)
  (:policy :fast-safe)
  (:args (object :scs (descriptor-reg) :to (:result 1)))
  (:results (value :scs (descriptor-reg any-reg)))
  (:vop-var vop)
  (:save-p :compute-only)
  (:generator 9
    (let* ((check-unbound-label (gen-label))
           (err-lab (generate-error-code vop unbound-symbol-error object))
           (ret-lab (gen-label)))
      (loadw value object symbol-tls-index-slot other-pointer-lowtag)
      (inst fs-segment-prefix)
      (inst mov value (make-ea :dword :base value))
      (inst cmp value no-tls-value-marker-widetag)
      (inst jmp :ne check-unbound-label)
      (loadw value object symbol-value-slot other-pointer-lowtag)
      (emit-label check-unbound-label)
      (inst cmp value unbound-marker-widetag)
      (inst jmp :e err-lab)
      (emit-label ret-lab))))

#!+sb-thread
(define-vop (fast-symbol-value symbol-value)
  ;; KLUDGE: not really fast, in fact, because we're going to have to
  ;; do a full lookup of the thread-local area anyway.  But half of
  ;; the meaning of FAST-SYMBOL-VALUE is "do not signal an error if
  ;; unbound", which is used in the implementation of COPY-SYMBOL.  --
  ;; CSR, 2003-04-22
  (:policy :fast)
  (:translate symbol-value)
  (:generator 8
    (let ((ret-lab (gen-label)))
      (loadw value object symbol-tls-index-slot other-pointer-lowtag)
      (inst fs-segment-prefix)
      (inst mov value (make-ea :dword :base value))
      (inst cmp value no-tls-value-marker-widetag)
      (inst jmp :ne ret-lab)
      (loadw value object symbol-value-slot other-pointer-lowtag)
      (emit-label ret-lab))))

#!-sb-thread
(define-vop (symbol-value)
  (:translate symbol-value)
  (:policy :fast-safe)
  (:args (object :scs (descriptor-reg) :to (:result 1)))
  (:results (value :scs (descriptor-reg any-reg)))
  (:vop-var vop)
  (:save-p :compute-only)
  (:generator 9
    (let ((err-lab (generate-error-code vop unbound-symbol-error object)))
      (loadw value object symbol-value-slot other-pointer-lowtag)
      (inst cmp value unbound-marker-widetag)
      (inst jmp :e err-lab))))

#!-sb-thread
(define-vop (fast-symbol-value cell-ref)
  (:variant symbol-value-slot other-pointer-lowtag)
  (:policy :fast)
  (:translate symbol-value))

(defknown locked-symbol-global-value-add (symbol fixnum) fixnum ())

(define-vop (locked-symbol-global-value-add)
    (:args (object :scs (descriptor-reg) :to :result)
           (value :scs (any-reg) :target result))
  (:arg-types * tagged-num)
  (:results (result :scs (any-reg) :from (:argument 1)))
  (:policy :fast)
  (:translate locked-symbol-global-value-add)
  (:result-types tagged-num)
  (:policy :fast-safe)
  (:generator 4
    (move result value)
    (inst lock)
    (inst add (make-ea :dword :base object
                       :disp (- (* symbol-value-slot n-word-bytes)
                                other-pointer-lowtag))
          value)))

#!+sb-thread
(define-vop (boundp)
  (:translate boundp)
  (:policy :fast-safe)
  (:args (object :scs (descriptor-reg)))
  (:conditional)
  (:info target not-p)
  (:temporary (:sc descriptor-reg #+nil(:from (:argument 0))) value)
  (:generator 9
    (let ((check-unbound-label (gen-label)))
      (loadw value object symbol-tls-index-slot other-pointer-lowtag)
      (inst fs-segment-prefix)
      (inst mov value (make-ea :dword :base value))
      (inst cmp value no-tls-value-marker-widetag)
      (inst jmp :ne check-unbound-label)
      (loadw value object symbol-value-slot other-pointer-lowtag)
      (emit-label check-unbound-label)
      (inst cmp value unbound-marker-widetag)
      (inst jmp (if not-p :e :ne) target))))

#!-sb-thread
(define-vop (boundp)
  (:translate boundp)
  (:policy :fast-safe)
  (:args (object :scs (descriptor-reg)))
  (:conditional)
  (:info target not-p)
  (:generator 9
    (inst cmp (make-ea-for-object-slot object symbol-value-slot
                                       other-pointer-lowtag)
          unbound-marker-widetag)
    (inst jmp (if not-p :e :ne) target)))


(define-vop (symbol-hash)
  (:policy :fast-safe)
  (:translate symbol-hash)
  (:args (symbol :scs (descriptor-reg)))
  (:results (res :scs (any-reg)))
  (:result-types positive-fixnum)
  (:generator 2
    ;; The symbol-hash slot of NIL holds NIL because it is also the
    ;; cdr slot, so we have to strip off the two low bits to make sure
    ;; it is a fixnum.  The lowtag selection magic that is required to
    ;; ensure this is explained in the comment in objdef.lisp
    (loadw res symbol symbol-hash-slot other-pointer-lowtag)
    (inst and res (lognot #b11))))

;;;; fdefinition (FDEFN) objects

(define-vop (fdefn-fun cell-ref)        ; /pfw - alpha
  (:variant fdefn-fun-slot other-pointer-lowtag))

(define-vop (safe-fdefn-fun)
  (:args (object :scs (descriptor-reg) :to (:result 1)))
  (:results (value :scs (descriptor-reg any-reg)))
  (:vop-var vop)
  (:save-p :compute-only)
  (:generator 10
    (loadw value object fdefn-fun-slot other-pointer-lowtag)
    (inst cmp value nil-value)
    (let ((err-lab (generate-error-code vop undefined-fun-error object)))
      (inst jmp :e err-lab))))

(define-vop (set-fdefn-fun)
  (:policy :fast-safe)
  (:translate (setf fdefn-fun))
  (:args (function :scs (descriptor-reg) :target result)
         (fdefn :scs (descriptor-reg)))
  (:temporary (:sc unsigned-reg) raw)
  (:temporary (:sc byte-reg) type)
  (:results (result :scs (descriptor-reg)))
  (:generator 38
    (load-type type function (- fun-pointer-lowtag))
    (inst lea raw
          (make-ea :byte :base function
                   :disp (- (* simple-fun-code-offset n-word-bytes)
                            fun-pointer-lowtag)))
    (inst cmp type simple-fun-header-widetag)
    (inst jmp :e normal-fn)
    (inst lea raw (make-fixup "closure_tramp" :foreign))
    NORMAL-FN
    (storew function fdefn fdefn-fun-slot other-pointer-lowtag)
    (storew raw fdefn fdefn-raw-addr-slot other-pointer-lowtag)
    (move result function)))

(define-vop (fdefn-makunbound)
  (:policy :fast-safe)
  (:translate fdefn-makunbound)
  (:args (fdefn :scs (descriptor-reg) :target result))
  (:results (result :scs (descriptor-reg)))
  (:generator 38
    (storew nil-value fdefn fdefn-fun-slot other-pointer-lowtag)
    (storew (make-fixup "undefined_tramp" :foreign)
            fdefn fdefn-raw-addr-slot other-pointer-lowtag)
    (move result fdefn)))

;;;; binding and unbinding

;;; BIND -- Establish VAL as a binding for SYMBOL. Save the old value and
;;; the symbol on the binding stack and stuff the new value into the
;;; symbol.

#!+sb-thread
(define-vop (bind)
  (:args (val :scs (any-reg descriptor-reg))
         (symbol :scs (descriptor-reg)))
  (:temporary (:sc descriptor-reg :offset eax-offset) eax)
  (:temporary (:sc unsigned-reg) tls-index temp bsp)
  (:generator 10
    (let ((tls-index-valid (gen-label))
          (get-tls-index-lock (gen-label))
          (release-tls-index-lock (gen-label)))
      (load-binding-stack-pointer bsp)
      (loadw tls-index symbol symbol-tls-index-slot other-pointer-lowtag)
      (inst add bsp (* binding-size n-word-bytes))
      (store-binding-stack-pointer bsp)
      (inst or tls-index tls-index)
      (inst jmp :ne tls-index-valid)

      (pseudo-atomic
       (emit-label get-tls-index-lock)
       (inst mov temp 1)
       (inst xor eax eax)
       (inst lock)
       (inst cmpxchg (make-ea-for-symbol-value *tls-index-lock*) temp)
       (inst jmp :ne get-tls-index-lock)
       ;; now with the lock held, see if the symbol's tls index has
       ;; been set in the meantime
       (loadw tls-index symbol symbol-tls-index-slot other-pointer-lowtag)
       (inst or tls-index tls-index)
       (inst jmp :ne release-tls-index-lock)
       ;; allocate a new tls-index
       (load-symbol-value tls-index *free-tls-index*)
       (inst add tls-index 4)          ;XXX surely we can do this more
       (store-symbol-value tls-index *free-tls-index*) ;succintly
       (inst sub tls-index 4)
       (storew tls-index symbol symbol-tls-index-slot other-pointer-lowtag)
       (emit-label release-tls-index-lock)
       (store-symbol-value 0 *tls-index-lock*))

      (emit-label tls-index-valid)
      (inst fs-segment-prefix)
      (inst mov temp (make-ea :dword :base tls-index))
      (storew temp bsp (- binding-value-slot binding-size))
      (storew symbol bsp (- binding-symbol-slot binding-size))
      (inst fs-segment-prefix)
      (inst mov (make-ea :dword :base tls-index) val))))

#!-sb-thread
(define-vop (bind)
  (:args (val :scs (any-reg descriptor-reg))
         (symbol :scs (descriptor-reg)))
  (:temporary (:sc unsigned-reg) temp bsp)
  (:generator 5
    (load-symbol-value bsp *binding-stack-pointer*)
    (loadw temp symbol symbol-value-slot other-pointer-lowtag)
    (inst add bsp (* binding-size n-word-bytes))
    (store-symbol-value bsp *binding-stack-pointer*)
    (storew temp bsp (- binding-value-slot binding-size))
    (storew symbol bsp (- binding-symbol-slot binding-size))
    (storew val symbol symbol-value-slot other-pointer-lowtag)))


#!+sb-thread
(define-vop (unbind)
    ;; four temporaries?
  (:temporary (:sc unsigned-reg) symbol value bsp tls-index)
  (:generator 0
    (load-binding-stack-pointer bsp)
    (loadw symbol bsp (- binding-symbol-slot binding-size))
    (loadw value bsp (- binding-value-slot binding-size))

    (loadw tls-index symbol symbol-tls-index-slot other-pointer-lowtag)
    (inst fs-segment-prefix)
    (inst mov (make-ea :dword :base tls-index) value)

    (storew 0 bsp (- binding-value-slot binding-size))
    (storew 0 bsp (- binding-symbol-slot binding-size))
    (inst sub bsp (* binding-size n-word-bytes))
    (store-binding-stack-pointer bsp)))

#!-sb-thread
(define-vop (unbind)
  (:temporary (:sc unsigned-reg) symbol value bsp)
  (:generator 0
    (load-symbol-value bsp *binding-stack-pointer*)
    (loadw symbol bsp (- binding-symbol-slot binding-size))
    (loadw value bsp (- binding-value-slot binding-size))
    (storew value symbol symbol-value-slot other-pointer-lowtag)
    (storew 0 bsp (- binding-value-slot binding-size))
    (storew 0 bsp (- binding-symbol-slot binding-size))
    (inst sub bsp (* binding-size n-word-bytes))
    (store-symbol-value bsp *binding-stack-pointer*)))


(define-vop (unbind-to-here)
  (:args (where :scs (descriptor-reg any-reg)))
  (:temporary (:sc unsigned-reg) symbol value bsp #!+sb-thread tls-index)
  (:generator 0
    (load-binding-stack-pointer bsp)
    (inst cmp where bsp)
    (inst jmp :e done)

    LOOP
    (loadw symbol bsp (- binding-symbol-slot binding-size))
    (inst or symbol symbol)
    (inst jmp :z skip)
    (loadw value bsp (- binding-value-slot binding-size))
    #!-sb-thread (storew value symbol symbol-value-slot other-pointer-lowtag)

    #!+sb-thread (loadw
                  tls-index symbol symbol-tls-index-slot other-pointer-lowtag)
    #!+sb-thread (inst fs-segment-prefix)
    #!+sb-thread (inst mov (make-ea :dword :base tls-index) value)
    (storew 0 bsp (- binding-value-slot binding-size))
    (storew 0 bsp (- binding-symbol-slot binding-size))

    SKIP
    (inst sub bsp (* binding-size n-word-bytes))
    (inst cmp where bsp)
    (inst jmp :ne loop)
    (store-binding-stack-pointer bsp)

    DONE))



;;;; closure indexing

(define-full-reffer closure-index-ref *
  closure-info-offset fun-pointer-lowtag
  (any-reg descriptor-reg) * %closure-index-ref)

(define-full-setter set-funcallable-instance-info *
  funcallable-instance-info-offset fun-pointer-lowtag
  (any-reg descriptor-reg) * %set-funcallable-instance-info)

(define-full-reffer funcallable-instance-info *
  funcallable-instance-info-offset fun-pointer-lowtag
  (descriptor-reg any-reg) * %funcallable-instance-info)

(define-vop (closure-ref slot-ref)
  (:variant closure-info-offset fun-pointer-lowtag))

(define-vop (closure-init slot-set)
  (:variant closure-info-offset fun-pointer-lowtag))

;;;; value cell hackery

(define-vop (value-cell-ref cell-ref)
  (:variant value-cell-value-slot other-pointer-lowtag))

(define-vop (value-cell-set cell-set)
  (:variant value-cell-value-slot other-pointer-lowtag))

;;;; structure hackery

(define-vop (instance-length)
  (:policy :fast-safe)
  (:translate %instance-length)
  (:args (struct :scs (descriptor-reg)))
  (:results (res :scs (unsigned-reg)))
  (:result-types positive-fixnum)
  (:generator 4
    (loadw res struct 0 instance-pointer-lowtag)
    (inst shr res n-widetag-bits)))

(define-full-reffer instance-index-ref * instance-slots-offset
  instance-pointer-lowtag (any-reg descriptor-reg) * %instance-ref)

(define-full-setter instance-index-set * instance-slots-offset
  instance-pointer-lowtag (any-reg descriptor-reg) * %instance-set)


(defknown %instance-set-conditional (instance index t t) t
          (unsafe))

(define-vop (instance-set-conditional)
  (:translate %instance-set-conditional)
  (:args (object :scs (descriptor-reg) :to :eval)
         (slot :scs (any-reg) :to :result)
         (old-value :scs (descriptor-reg any-reg) :target eax)
         (new-value :scs (descriptor-reg any-reg)))
  (:arg-types instance positive-fixnum * *)
  (:temporary (:sc descriptor-reg :offset eax-offset
                   :from (:argument 2) :to :result :target result)  eax)
  (:results (result :scs (descriptor-reg any-reg)))
  ;(:guard (backend-featurep :i486))
  (:policy :fast-safe)
  (:generator 5
    (move eax old-value)
    (inst lock)
    (inst cmpxchg (make-ea :dword :base object :index slot :scale 1
                           :disp (- (* instance-slots-offset n-word-bytes)
                                    instance-pointer-lowtag))
          new-value)
    (move result eax)))



;;;; code object frobbing

(define-full-reffer code-header-ref * 0 other-pointer-lowtag
  (any-reg descriptor-reg) * code-header-ref)

(define-full-setter code-header-set * 0 other-pointer-lowtag
  (any-reg descriptor-reg) * code-header-set)



;;;; raw instance slot accessors

(defun make-ea-for-raw-slot (object index instance-length n-words)
  (sc-case index
    (any-reg (make-ea :dword
                      :base object
                      :index instance-length
                      :disp (- (* (- instance-slots-offset n-words)
                                  n-word-bytes)
                               instance-pointer-lowtag)))
    (immediate (make-ea :dword :base object
                        :index instance-length
                        :scale 4
                        :disp (- (* (- instance-slots-offset n-words)
                                    n-word-bytes)
                                 instance-pointer-lowtag
                                 (fixnumize (tn-value index)))))))

(define-vop (raw-instance-ref/word)
  (:translate %raw-instance-ref/word)
  (:policy :fast-safe)
  (:args (object :scs (descriptor-reg)) (index :scs (any-reg immediate)))
  (:arg-types * tagged-num)
  (:temporary (:sc unsigned-reg) tmp)
  (:results (value :scs (unsigned-reg)))
  (:result-types unsigned-num)
  (:generator 5
    (loadw tmp object 0 instance-pointer-lowtag)
    (inst shr tmp n-widetag-bits)
    (when (sc-is index any-reg)
      (inst shl tmp 2)
      (inst sub tmp index))
    (inst mov value (make-ea-for-raw-slot object index tmp 1))))

(define-vop (raw-instance-set/word)
  (:translate %raw-instance-set/word)
  (:policy :fast-safe)
  (:args (object :scs (descriptor-reg))
         (index :scs (any-reg immediate))
         (value :scs (unsigned-reg) :target result))
  (:arg-types * tagged-num unsigned-num)
  (:temporary (:sc unsigned-reg) tmp)
  (:results (result :scs (unsigned-reg)))
  (:result-types unsigned-num)
  (:generator 5
    (loadw tmp object 0 instance-pointer-lowtag)
    (inst shr tmp n-widetag-bits)
    (when (sc-is index any-reg)
      (inst shl tmp 2)
      (inst sub tmp index))
    (inst mov (make-ea-for-raw-slot object index tmp 1) value)
    (move result value)))

(define-vop (raw-instance-ref/single)
  (:translate %raw-instance-ref/single)
  (:policy :fast-safe)
  (:args (object :scs (descriptor-reg)) (index :scs (any-reg immediate)))
  (:arg-types * tagged-num)
  (:temporary (:sc unsigned-reg) tmp)
  (:results (value :scs (single-reg)))
  (:result-types single-float)
  (:generator 5
    (loadw tmp object 0 instance-pointer-lowtag)
    (inst shr tmp n-widetag-bits)
    (when (sc-is index any-reg)
      (inst shl tmp 2)
      (inst sub tmp index))
    (with-empty-tn@fp-top(value)
      (inst fld (make-ea-for-raw-slot object index tmp 1)))))

(define-vop (raw-instance-set/single)
  (:translate %raw-instance-set/single)
  (:policy :fast-safe)
  (:args (object :scs (descriptor-reg))
         (index :scs (any-reg immediate))
         (value :scs (single-reg) :target result))
  (:arg-types * tagged-num single-float)
  (:temporary (:sc unsigned-reg) tmp)
  (:results (result :scs (single-reg)))
  (:result-types single-float)
  (:generator 5
    (loadw tmp object 0 instance-pointer-lowtag)
    (inst shr tmp n-widetag-bits)
    (when (sc-is index any-reg)
      (inst shl tmp 2)
      (inst sub tmp index))
    (unless (zerop (tn-offset value))
      (inst fxch value))
    (inst fst (make-ea-for-raw-slot object index tmp 1))
    (cond
      ((zerop (tn-offset value))
        (unless (zerop (tn-offset result))
          (inst fst result)))
      ((zerop (tn-offset result))
        (inst fst value))
      (t
        (unless (location= value result)
          (inst fst result))
        (inst fxch value)))))

(define-vop (raw-instance-ref/double)
  (:translate %raw-instance-ref/double)
  (:policy :fast-safe)
  (:args (object :scs (descriptor-reg)) (index :scs (any-reg immediate)))
  (:arg-types * tagged-num)
  (:temporary (:sc unsigned-reg) tmp)
  (:results (value :scs (double-reg)))
  (:result-types double-float)
  (:generator 5
    (loadw tmp object 0 instance-pointer-lowtag)
    (inst shr tmp n-widetag-bits)
    (when (sc-is index any-reg)
      (inst shl tmp 2)
      (inst sub tmp index))
    (with-empty-tn@fp-top(value)
      (inst fldd (make-ea-for-raw-slot object index tmp 2)))))

(define-vop (raw-instance-set/double)
  (:translate %raw-instance-set/double)
  (:policy :fast-safe)
  (:args (object :scs (descriptor-reg))
         (index :scs (any-reg immediate))
         (value :scs (double-reg) :target result))
  (:arg-types * tagged-num double-float)
  (:temporary (:sc unsigned-reg) tmp)
  (:results (result :scs (double-reg)))
  (:result-types double-float)
  (:generator 5
    (loadw tmp object 0 instance-pointer-lowtag)
    (inst shr tmp n-widetag-bits)
    (when (sc-is index any-reg)
      (inst shl tmp 2)
      (inst sub tmp index))
    (unless (zerop (tn-offset value))
      (inst fxch value))
    (inst fstd (make-ea-for-raw-slot object index tmp 2))
    (cond
      ((zerop (tn-offset value))
        (unless (zerop (tn-offset result))
          (inst fstd result)))
      ((zerop (tn-offset result))
        (inst fstd value))
      (t
        (unless (location= value result)
          (inst fstd result))
        (inst fxch value)))))

(define-vop (raw-instance-ref/complex-single)
  (:translate %raw-instance-ref/complex-single)
  (:policy :fast-safe)
  (:args (object :scs (descriptor-reg))
         (index :scs (any-reg immediate)))
  (:arg-types * positive-fixnum)
  (:temporary (:sc unsigned-reg) tmp)
  (:results (value :scs (complex-single-reg)))
  (:result-types complex-single-float)
  (:generator 5
    (loadw tmp object 0 instance-pointer-lowtag)
    (inst shr tmp n-widetag-bits)
    (when (sc-is index any-reg)
      (inst shl tmp 2)
      (inst sub tmp index))
    (let ((real-tn (complex-single-reg-real-tn value)))
      (with-empty-tn@fp-top (real-tn)
        (inst fld (make-ea-for-raw-slot object index tmp 2))))
    (let ((imag-tn (complex-single-reg-imag-tn value)))
      (with-empty-tn@fp-top (imag-tn)
        (inst fld (make-ea-for-raw-slot object index tmp 1))))))

(define-vop (raw-instance-set/complex-single)
  (:translate %raw-instance-set/complex-single)
  (:policy :fast-safe)
  (:args (object :scs (descriptor-reg))
         (index :scs (any-reg immediate))
         (value :scs (complex-single-reg) :target result))
  (:arg-types * positive-fixnum complex-single-float)
  (:temporary (:sc unsigned-reg) tmp)
  (:results (result :scs (complex-single-reg)))
  (:result-types complex-single-float)
  (:generator 5
    (loadw tmp object 0 instance-pointer-lowtag)
    (inst shr tmp n-widetag-bits)
    (when (sc-is index any-reg)
      (inst shl tmp 2)
      (inst sub tmp index))
    (let ((value-real (complex-single-reg-real-tn value))
          (result-real (complex-single-reg-real-tn result)))
      (cond ((zerop (tn-offset value-real))
             ;; Value is in ST0.
             (inst fst (make-ea-for-raw-slot object index tmp 2))
             (unless (zerop (tn-offset result-real))
               ;; Value is in ST0 but not result.
               (inst fst result-real)))
            (t
             ;; Value is not in ST0.
             (inst fxch value-real)
             (inst fst (make-ea-for-raw-slot object index tmp 2))
             (cond ((zerop (tn-offset result-real))
                    ;; The result is in ST0.
                    (inst fst value-real))
                   (t
                    ;; Neither value or result are in ST0
                    (unless (location= value-real result-real)
                      (inst fst result-real))
                    (inst fxch value-real))))))
    (let ((value-imag (complex-single-reg-imag-tn value))
          (result-imag (complex-single-reg-imag-tn result)))
      (inst fxch value-imag)
      (inst fst (make-ea-for-raw-slot object index tmp 1))
      (unless (location= value-imag result-imag)
        (inst fst result-imag))
      (inst fxch value-imag))))

(define-vop (raw-instance-ref/complex-double)
  (:translate %raw-instance-ref/complex-double)
  (:policy :fast-safe)
  (:args (object :scs (descriptor-reg))
         (index :scs (any-reg immediate)))
  (:arg-types * positive-fixnum)
  (:temporary (:sc unsigned-reg) tmp)
  (:results (value :scs (complex-double-reg)))
  (:result-types complex-double-float)
  (:generator 7
    (loadw tmp object 0 instance-pointer-lowtag)
    (inst shr tmp n-widetag-bits)
    (when (sc-is index any-reg)
      (inst shl tmp 2)
      (inst sub tmp index))
    (let ((real-tn (complex-double-reg-real-tn value)))
      (with-empty-tn@fp-top (real-tn)
        (inst fldd (make-ea-for-raw-slot object index tmp 4))))
    (let ((imag-tn (complex-double-reg-imag-tn value)))
      (with-empty-tn@fp-top (imag-tn)
        (inst fldd (make-ea-for-raw-slot object index tmp 2))))))

(define-vop (raw-instance-set/complex-double)
  (:translate %raw-instance-set/complex-double)
  (:policy :fast-safe)
  (:args (object :scs (descriptor-reg))
         (index :scs (any-reg immediate))
         (value :scs (complex-double-reg) :target result))
  (:arg-types * positive-fixnum complex-double-float)
  (:temporary (:sc unsigned-reg) tmp)
  (:results (result :scs (complex-double-reg)))
  (:result-types complex-double-float)
  (:generator 20
    (loadw tmp object 0 instance-pointer-lowtag)
    (inst shr tmp n-widetag-bits)
    (when (sc-is index any-reg)
      (inst shl tmp 2)
      (inst sub tmp index))
    (let ((value-real (complex-double-reg-real-tn value))
          (result-real (complex-double-reg-real-tn result)))
      (cond ((zerop (tn-offset value-real))
             ;; Value is in ST0.
             (inst fstd (make-ea-for-raw-slot object index tmp 4))
             (unless (zerop (tn-offset result-real))
               ;; Value is in ST0 but not result.
               (inst fstd result-real)))
            (t
             ;; Value is not in ST0.
             (inst fxch value-real)
             (inst fstd (make-ea-for-raw-slot object index tmp 4))
             (cond ((zerop (tn-offset result-real))
                    ;; The result is in ST0.
                    (inst fstd value-real))
                   (t
                    ;; Neither value or result are in ST0
                    (unless (location= value-real result-real)
                      (inst fstd result-real))
                    (inst fxch value-real))))))
    (let ((value-imag (complex-double-reg-imag-tn value))
          (result-imag (complex-double-reg-imag-tn result)))
      (inst fxch value-imag)
      (inst fstd (make-ea-for-raw-slot object index tmp 2))
      (unless (location= value-imag result-imag)
        (inst fstd result-imag))
      (inst fxch value-imag))))