src/compiler/sparc/values.lisp

   1 ;;;; the sparc implementation of unknown-values VOPs
   2
   3 ;;;; This software is part of the SBCL system. See the README file for
   4 ;;;; more information.
   5 ;;;;
   6 ;;;; This software is derived from the CMU CL system, which was
   7 ;;;; written at Carnegie Mellon University and released into the
   8 ;;;; public domain. The software is in the public domain and is
   9 ;;;; provided with absolutely no warranty. See the COPYING and CREDITS
  10 ;;;; files for more information.
  11
  12 (in-package "SB!VM")
  13
  14 (define-vop (reset-stack-pointer)
  15   (:args (ptr :scs (any-reg)))
  16   (:generator 1
  17     (move csp-tn ptr)))
  18
  19 (define-vop (%%pop-dx)
  20   (:args (ptr :scs (any-reg)))
  21   (:ignore ptr)
  22   (:generator 1
  23     (bug "VOP %%POP-DX is not implemented.")))
  24
  25 (define-vop (%%nip-dx)
  26   (:args (last-nipped-ptr :scs (any-reg) :target dest)
  27          (last-preserved-ptr :scs (any-reg) :target src)
  28          (moved-ptrs :scs (any-reg) :more t))
  29   (:results (r-moved-ptrs :scs (any-reg) :more t))
  30   (:temporary (:sc any-reg) src)
  31   (:temporary (:sc any-reg) dest)
  32   (:temporary (:sc non-descriptor-reg) temp)
  33   (:ignore r-moved-ptrs
  34            last-nipped-ptr last-preserved-ptr moved-ptrs
  35            src dest temp)
  36   (:generator 1
  37     (bug "VOP %%NIP-DX is not implemented.")))
  38
  39 (define-vop (%%nip-values)
  40   (:args (last-nipped-ptr :scs (any-reg) :target dest)
  41          (last-preserved-ptr :scs (any-reg) :target src)
  42          (moved-ptrs :scs (any-reg) :more t))
  43   (:results (r-moved-ptrs :scs (any-reg) :more t))
  44   (:temporary (:sc any-reg) src)
  45   (:temporary (:sc any-reg) dest)
  46   (:temporary (:sc non-descriptor-reg) temp)
  47   (:ignore r-moved-ptrs)
  48   (:generator 1
  49     (inst move dest last-nipped-ptr)
  50     (inst move src last-preserved-ptr)
  51     (inst cmp csp-tn src)
  52     (inst b :le DONE)
  53     (inst nop) ; not strictly necessary
  54     LOOP
  55     (loadw temp src)
  56     (inst add dest dest n-word-bytes)
  57     (inst add src src n-word-bytes)
  58     (storew temp dest -1)
  59     (inst cmp csp-tn src)
  60     (inst b :gt LOOP)
  61     (inst nop)
  62     DONE
  63     (inst move csp-tn dest)
  64     (inst sub src src dest)
  65     (loop for moved = moved-ptrs then (tn-ref-across moved)
  66           while moved
  67           do (sc-case (tn-ref-tn moved)
  68                ((descriptor-reg any-reg)
  69                 (inst sub (tn-ref-tn moved) (tn-ref-tn moved) src))
  70                ((control-stack)
  71                 (load-stack-tn temp (tn-ref-tn moved))
  72                 (inst sub temp temp src)
  73                 (store-stack-tn (tn-ref-tn moved) temp))))))
  74
  75 ;;; Push some values onto the stack, returning the start and number of
  76 ;;; values pushed as results.  It is assumed that the Vals are wired
  77 ;;; to the standard argument locations.  Nvals is the number of values
  78 ;;; to push.
  79 ;;;
  80 ;;; The generator cost is pseudo-random.  We could get it right by
  81 ;;; defining a bogus SC that reflects the costs of the
  82 ;;; memory-to-memory moves for each operand, but this seems
  83 ;;; unworthwhile.
  84 (define-vop (push-values)
  85   (:args (vals :more t))
  86   (:results (start :scs (any-reg) :from :load)
  87             (count :scs (any-reg)))
  88   (:info nvals)
  89   (:temporary (:scs (descriptor-reg)) temp)
  90   (:generator 20
  91     (inst move start csp-tn)
  92     (inst add csp-tn csp-tn (* nvals n-word-bytes))
  93     (do ((val vals (tn-ref-across val))
  94          (i 0 (1+ i)))
  95         ((null val))
  96       (let ((tn (tn-ref-tn val)))
  97         (sc-case tn
  98           (descriptor-reg
  99            (storew tn start i))
 100           (control-stack
 101            (load-stack-tn temp tn)
 102            (storew temp start i)))))
 103     (inst li count (fixnumize nvals))))
 104
 105 ;;; Push a list of values on the stack, returning Start and Count as
 106 ;;; used in unknown values continuations.
 107 (define-vop (values-list)
 108   (:args (arg :scs (descriptor-reg) :target list))
 109   (:arg-types list)
 110   (:policy :fast-safe)
 111   (:results (start :scs (any-reg))
 112             (count :scs (any-reg)))
 113   (:temporary (:scs (descriptor-reg) :type list :from (:argument 0)) list)
 114   (:temporary (:scs (descriptor-reg)) temp)
 115   (:temporary (:scs (non-descriptor-reg)) ndescr)
 116   (:vop-var vop)
 117   (:save-p :compute-only)
 118   (:generator 0
 119     (let ((loop (gen-label))
 120           (done (gen-label)))
 121
 122       (move list arg)
 123       (move start csp-tn)
 124
 125       (emit-label loop)
 126       (inst cmp list null-tn)
 127       (inst b :eq done)
 128       (loadw temp list cons-car-slot list-pointer-lowtag)
 129       (loadw list list cons-cdr-slot list-pointer-lowtag)
 130       (inst add csp-tn csp-tn n-word-bytes)
 131       (storew temp csp-tn -1)
 132       (test-type list loop nil (list-pointer-lowtag) :temp ndescr)
 133       (error-call vop bogus-arg-to-values-list-error list)
 134
 135       (emit-label done)
 136       (inst sub count csp-tn start))))
 137
 138
 139
 140 ;;; Copy the more arg block to the top of the stack so we can use them
 141 ;;; as function arguments.
 142 (define-vop (%more-arg-values)
 143   (:args (context :scs (descriptor-reg any-reg) :target src)
 144          (skip :scs (any-reg zero immediate))
 145          (num :scs (any-reg) :target count))
 146   (:arg-types * positive-fixnum positive-fixnum)
 147   (:temporary (:sc any-reg :from (:argument 0)) src)
 148   (:temporary (:sc any-reg :from (:argument 2)) dst)
 149   (:temporary (:sc descriptor-reg :from (:argument 1)) temp)
 150   (:temporary (:sc any-reg) i)
 151   (:results (start :scs (any-reg))
 152             (count :scs (any-reg)))
 153   (:generator 20
 154     (sc-case skip
 155       (zero
 156        (move src context))
 157       (immediate
 158        (inst add src context (* (tn-value skip) n-word-bytes)))
 159       (any-reg
 160        (inst add src context skip)))
 161     (inst orcc count zero-tn num)
 162     (inst b :eq done)
 163     (inst move start csp-tn)
 164     (inst move dst csp-tn)
 165     (inst add csp-tn count)
 166     (inst move i count)
 167     LOOP
 168     (inst subcc i 4)
 169     (inst ld temp src i)
 170     (inst b :ne loop)
 171     (inst st temp dst i)
 172     DONE))