src/compiler/ppc/sap.lisp

   1 ;;;
   2 ;;; Written by William Lott.
   3 ;;;
   4 (in-package "SB!VM")
   5
   6 \f
   7 ;;;; Moves and coercions:
   8
   9 ;;; Move a tagged SAP to an untagged representation.
  10 ;;;
  11 (define-vop (move-to-sap)
  12   (:args (x :scs (any-reg descriptor-reg)))
  13   (:results (y :scs (sap-reg)))
  14   (:note "pointer to SAP coercion")
  15   (:generator 1
  16     (loadw y x sap-pointer-slot other-pointer-lowtag)))
  17
  18 ;;;
  19 (define-move-vop move-to-sap :move
  20   (descriptor-reg) (sap-reg))
  21
  22
  23 ;;; Move an untagged SAP to a tagged representation.
  24 ;;;
  25 (define-vop (move-from-sap)
  26   (:args (sap :scs (sap-reg) :to :save))
  27   (:temporary (:scs (non-descriptor-reg)) ndescr)
  28   (:temporary (:sc non-descriptor-reg :offset nl3-offset) pa-flag)
  29   (:results (res :scs (descriptor-reg)))
  30   (:note "SAP to pointer coercion")
  31   (:generator 20
  32     (with-fixed-allocation (res pa-flag ndescr sap-widetag sap-size)
  33       (storew sap res sap-pointer-slot other-pointer-lowtag))))
  34 ;;;
  35 (define-move-vop move-from-sap :move
  36   (sap-reg) (descriptor-reg))
  37
  38
  39 ;;; Move untagged sap values.
  40 ;;;
  41 (define-vop (sap-move)
  42   (:args (x :target y
  43             :scs (sap-reg)
  44             :load-if (not (location= x y))))
  45   (:results (y :scs (sap-reg)
  46                :load-if (not (location= x y))))
  47   (:note "SAP move")
  48   (:effects)
  49   (:affected)
  50   (:generator 0
  51     (move y x)))
  52 ;;;
  53 (define-move-vop sap-move :move
  54   (sap-reg) (sap-reg))
  55
  56
  57 ;;; Move untagged sap arguments/return-values.
  58 ;;;
  59 (define-vop (move-sap-arg)
  60   (:args (x :target y
  61             :scs (sap-reg))
  62          (fp :scs (any-reg)
  63              :load-if (not (sc-is y sap-reg))))
  64   (:results (y))
  65   (:note "SAP argument move")
  66   (:generator 0
  67     (sc-case y
  68       (sap-reg
  69        (move y x))
  70       (sap-stack
  71        (storew x fp (tn-offset y))))))
  72 ;;;
  73 (define-move-vop move-sap-arg :move-arg
  74   (descriptor-reg sap-reg) (sap-reg))
  75
  76
  77 ;;; Use standard MOVE-ARG + coercion to move an untagged sap to a
  78 ;;; descriptor passing location.
  79 ;;;
  80 (define-move-vop move-arg :move-arg
  81   (sap-reg) (descriptor-reg))
  82
  83
  84 \f
  85 ;;;; SAP-INT and INT-SAP
  86
  87 (define-vop (sap-int)
  88   (:args (sap :scs (sap-reg) :target int))
  89   (:arg-types system-area-pointer)
  90   (:results (int :scs (unsigned-reg)))
  91   (:result-types unsigned-num)
  92   (:translate sap-int)
  93   (:policy :fast-safe)
  94   (:generator 1
  95     (move int sap)))
  96
  97 (define-vop (int-sap)
  98   (:args (int :scs (unsigned-reg) :target sap))
  99   (:arg-types unsigned-num)
 100   (:results (sap :scs (sap-reg)))
 101   (:result-types system-area-pointer)
 102   (:translate int-sap)
 103   (:policy :fast-safe)
 104   (:generator 1
 105     (move sap int)))
 106
 107
 108 \f
 109 ;;;; POINTER+ and POINTER-
 110
 111 (define-vop (pointer+)
 112   (:translate sap+)
 113   (:args (ptr :scs (sap-reg))
 114          (offset :scs (signed-reg)))
 115   (:arg-types system-area-pointer signed-num)
 116   (:results (res :scs (sap-reg)))
 117   (:result-types system-area-pointer)
 118   (:policy :fast-safe)
 119   (:generator 2
 120     (inst add res ptr offset)))
 121
 122 (define-vop (pointer+-c)
 123   (:translate sap+)
 124   (:args (ptr :scs (sap-reg)))
 125   (:info offset)
 126   (:arg-types system-area-pointer (:constant (signed-byte 16)))
 127   (:results (res :scs (sap-reg)))
 128   (:result-types system-area-pointer)
 129   (:policy :fast-safe)
 130   (:generator 1
 131     (inst addi res ptr offset)))
 132
 133 (define-vop (pointer-)
 134   (:translate sap-)
 135   (:args (ptr1 :scs (sap-reg))
 136          (ptr2 :scs (sap-reg)))
 137   (:arg-types system-area-pointer system-area-pointer)
 138   (:policy :fast-safe)
 139   (:results (res :scs (signed-reg)))
 140   (:result-types signed-num)
 141   (:generator 1
 142     (inst sub res ptr1 ptr2)))
 143
 144
 145 \f
 146 ;;;; mumble-SYSTEM-REF and mumble-SYSTEM-SET
 147
 148 (macrolet ((def-system-ref-and-set
 149                (ref-name set-name sc type size &optional signed)
 150                (let ((ref-name-c (symbolicate ref-name "-C"))
 151                      (set-name-c (symbolicate set-name "-C")))
 152                  `(progn
 153                    (define-vop (,ref-name)
 154                        (:translate ,ref-name)
 155                      (:policy :fast-safe)
 156                      (:args (sap :scs (sap-reg))
 157                       (offset :scs (signed-reg)))
 158                      (:arg-types system-area-pointer signed-num)
 159                      (:results (result :scs (,sc)))
 160                      (:result-types ,type)
 161                      (:generator 5
 162                       (inst ,(ecase size
 163                                     (:byte 'lbzx)
 164                                     (:short (if signed 'lhax 'lhzx))
 165                                     (:long 'lwzx)
 166                                     (:single 'lfsx)
 167                                     (:double 'lfdx))
 168                             result sap offset)
 169                       ,@(when (and (eq size :byte) signed)
 170                               '((inst extsb result result)))))
 171                    (define-vop (,ref-name-c)
 172                        (:translate ,ref-name)
 173                      (:policy :fast-safe)
 174                      (:args (sap :scs (sap-reg)))
 175                      (:arg-types system-area-pointer (:constant (signed-byte 16)))
 176                      (:info offset)
 177                      (:results (result :scs (,sc)))
 178                      (:result-types ,type)
 179                      (:generator 4
 180                       (inst ,(ecase size
 181                                     (:byte 'lbz)
 182                                     (:short (if signed 'lha 'lhz))
 183                                     (:long 'lwz)
 184                                     (:single 'lfs)
 185                                     (:double 'lfd))
 186                             result sap offset)
 187                       ,@(when (and (eq size :byte) signed)
 188                               '((inst extsb result result)))))
 189                    (define-vop (,set-name)
 190                        (:translate ,set-name)
 191                      (:policy :fast-safe)
 192                      (:args (sap :scs (sap-reg))
 193                       (offset :scs (signed-reg))
 194                       (value :scs (,sc) :target result))
 195                      (:arg-types system-area-pointer signed-num ,type)
 196                      (:results (result :scs (,sc)))
 197                      (:result-types ,type)
 198                      (:generator 5
 199                       (inst ,(ecase size
 200                                     (:byte 'stbx)
 201                                     (:short 'sthx)
 202                                     (:long 'stwx)
 203                                     (:single 'stfsx)
 204                                     (:double 'stfdx))
 205                             value sap offset)
 206                       (unless (location= result value)
 207                         ,@(case size
 208                                 (:single
 209                                  '((inst frsp result value)))
 210                                 (:double
 211                                  '((inst fmr result value)))
 212                                 (t
 213                                  '((inst mr result value)))))))
 214                    (define-vop (,set-name-c)
 215                        (:translate ,set-name)
 216                      (:policy :fast-safe)
 217                      (:args (sap :scs (sap-reg))
 218                       (value :scs (,sc) :target result))
 219                      (:arg-types system-area-pointer (:constant (signed-byte 16)) ,type)
 220                      (:info offset)
 221                      (:results (result :scs (,sc)))
 222                      (:result-types ,type)
 223                      (:generator 4
 224                       (inst ,(ecase size
 225                                     (:byte 'stb)
 226                                     (:short 'sth)
 227                                     (:long 'stw)
 228                                     (:single 'stfs)
 229                                     (:double 'stfd))
 230                             value sap offset)
 231                       (unless (location= result value)
 232                         ,@(case size
 233                                 (:single
 234                                  '((inst frsp result value)))
 235                                 (:double
 236                                  '((inst fmr result value)))
 237                                 (t
 238                                  '((inst mr result value)))))))))))
 239   (def-system-ref-and-set sap-ref-8 %set-sap-ref-8
 240     unsigned-reg positive-fixnum :byte nil)
 241   (def-system-ref-and-set signed-sap-ref-8 %set-signed-sap-ref-8
 242     signed-reg tagged-num :byte t)
 243   (def-system-ref-and-set sap-ref-16 %set-sap-ref-16
 244     unsigned-reg positive-fixnum :short nil)
 245   (def-system-ref-and-set signed-sap-ref-16 %set-signed-sap-ref-16
 246     signed-reg tagged-num :short t)
 247   (def-system-ref-and-set sap-ref-32 %set-sap-ref-32
 248     unsigned-reg unsigned-num :long nil)
 249   (def-system-ref-and-set signed-sap-ref-32 %set-signed-sap-ref-32
 250     signed-reg signed-num :long t)
 251   (def-system-ref-and-set sap-ref-sap %set-sap-ref-sap
 252     sap-reg system-area-pointer :long)
 253   (def-system-ref-and-set sap-ref-single %set-sap-ref-single
 254     single-reg single-float :single)
 255   (def-system-ref-and-set sap-ref-double %set-sap-ref-double
 256     double-reg double-float :double))
 257
 258
 259 \f
 260 ;;; Noise to convert normal lisp data objects into SAPs.
 261
 262 (define-vop (vector-sap)
 263   (:translate vector-sap)
 264   (:policy :fast-safe)
 265   (:args (vector :scs (descriptor-reg)))
 266   (:results (sap :scs (sap-reg)))
 267   (:result-types system-area-pointer)
 268   (:generator 2
 269     (inst addi sap vector
 270           (- (* vector-data-offset n-word-bytes) other-pointer-lowtag))))
 271
 272 \f
 273 ;;; Transforms for 64-bit SAP accessors.
 274 #|
 275 (deftransform sap-ref-64 ((sap offset) (* *))
 276   '(logior (ash (sap-ref-32 sap offset) 32)
 277            (sap-ref-32 sap (+ offset 4))))
 278
 279 (deftransform signed-sap-ref-64 ((sap offset) (* *))
 280   '(logior (ash (signed-sap-ref-32 sap offset) 32)
 281            (sap-ref-32 sap (+ 4 offset))))
 282
 283 (deftransform %set-sap-ref-64 ((sap offset value) (* * *))
 284   '(progn
 285      (%set-sap-ref-32 sap offset (ash value -32))
 286      (%set-sap-ref-32 sap (+ offset 4) (logand value #xffffffff))))
 287
 288 (deftransform %set-signed-sap-ref-64 ((sap offset value) (* * *))
 289   '(progn
 290      (%set-signed-sap-ref-32 sap offset (ash value -32))
 291      (%set-sap-ref-32 sap (+ 4 offset) (logand value #xffffffff))))
 292 |#