src/compiler/ppc/values.lisp

   1 ;;;
   2 ;;; Written by Rob MacLachlan
   3 ;;;
   4 ;;; Converted for SPARC by William Lott.
   5 ;;;
   6
   7 (in-package "SB!VM")
   8
   9 (define-vop (reset-stack-pointer)
  10   (:args (ptr :scs (any-reg)))
  11   (:generator 1
  12     (move csp-tn ptr)))
  13
  14
  15 ;;; Push some values onto the stack, returning the start and number of values
  16 ;;; pushed as results.  It is assumed that the Vals are wired to the standard
  17 ;;; argument locations.  Nvals is the number of values to push.
  18 ;;;
  19 ;;; The generator cost is pseudo-random.  We could get it right by defining a
  20 ;;; bogus SC that reflects the costs of the memory-to-memory moves for each
  21 ;;; operand, but this seems unworthwhile.
  22 ;;;
  23 (define-vop (push-values)
  24   (:args (vals :more t))
  25   (:results (start :scs (any-reg) :from :load)
  26             (count :scs (any-reg)))
  27   (:info nvals)
  28   (:temporary (:scs (descriptor-reg)) temp)
  29   (:generator 20
  30     (inst mr start csp-tn)
  31     (inst addi csp-tn csp-tn (* nvals sb!vm:n-word-bytes))
  32     (do ((val vals (tn-ref-across val))
  33          (i 0 (1+ i)))
  34         ((null val))
  35       (let ((tn (tn-ref-tn val)))
  36         (sc-case tn
  37           (descriptor-reg
  38            (storew tn start i))
  39           (control-stack
  40            (load-stack-tn temp tn)
  41            (storew temp start i)))))
  42     (inst lr count (fixnumize nvals))))
  43
  44 ;;; Push a list of values on the stack, returning Start and Count as used in
  45 ;;; unknown values continuations.
  46 ;;;
  47 (define-vop (values-list)
  48   (:args (arg :scs (descriptor-reg) :target list))
  49   (:arg-types list)
  50   (:policy :fast-safe)
  51   (:results (start :scs (any-reg))
  52             (count :scs (any-reg)))
  53   (:temporary (:scs (descriptor-reg) :type list :from (:argument 0)) list)
  54   (:temporary (:scs (descriptor-reg)) temp)
  55   (:temporary (:scs (non-descriptor-reg)) ndescr)
  56   (:vop-var vop)
  57   (:save-p :compute-only)
  58   (:generator 0
  59     (let ((loop (gen-label))
  60           (done (gen-label)))
  61
  62       (move list arg)
  63       (move start csp-tn)
  64
  65       (emit-label loop)
  66       (inst cmpw list null-tn)
  67       (loadw temp list sb!vm:cons-car-slot sb!vm:list-pointer-lowtag)
  68       (inst beq done)
  69       (loadw list list sb!vm:cons-cdr-slot sb!vm:list-pointer-lowtag)
  70       (inst addi csp-tn csp-tn sb!vm:n-word-bytes)
  71       (storew temp csp-tn -1)
  72       (test-type list ndescr loop nil sb!vm:list-pointer-lowtag)
  73       (error-call vop bogus-arg-to-values-list-error list)
  74
  75       (emit-label done)
  76       (inst sub count csp-tn start))))
  77
  78
  79 ;;; Copy the more arg block to the top of the stack so we can use them
  80 ;;; as function arguments.
  81 ;;;
  82 (define-vop (%more-arg-values)
  83   (:args (context :scs (descriptor-reg any-reg) :target src)
  84          (skip :scs (any-reg zero immediate))
  85          (num :scs (any-reg) :target count))
  86   (:arg-types * positive-fixnum positive-fixnum)
  87   (:temporary (:sc any-reg :from (:argument 0)) src)
  88   (:temporary (:sc any-reg :from (:argument 2)) dst)
  89   (:temporary (:sc descriptor-reg :from (:argument 1)) temp)
  90   (:temporary (:sc any-reg) i)
  91   (:results (start :scs (any-reg))
  92             (count :scs (any-reg)))
  93   (:generator 20
  94     (sc-case skip
  95       (zero
  96        (inst mr src context))
  97       (immediate
  98        (inst addi src context (* (tn-value skip) n-word-bytes)))
  99       (any-reg
 100        (inst add src context skip)))
 101     (inst mr. count num)
 102     (inst mr start csp-tn)
 103     (inst beq done)
 104     (inst mr dst csp-tn)
 105     (inst add csp-tn csp-tn count)
 106     (inst mr i count)
 107     LOOP
 108     (inst cmpwi i 4)
 109     (inst subi i i 4)
 110     (inst lwzx temp src i)
 111     (inst stwx temp dst i)
 112     (inst bne loop)
 113     DONE))