src/compiler/hppa/move.lisp

   1 ;;;; the HPPA VM definition of operand loading/saving and the Move VOP
   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-move-fun (load-immediate 1) (vop x y)
  15   ((null zero immediate)
  16    (any-reg descriptor-reg))
  17   (let ((val (tn-value x)))
  18     (etypecase val
  19       (integer
  20        (inst li (fixnumize val) y))
  21       (null
  22        (move null-tn y))
  23       (symbol
  24        (load-symbol y val))
  25       (character
  26        (inst li (logior (ash (char-code val) n-widetag-bits)
  27                         character-widetag)
  28              y)))))
  29
  30 (define-move-fun (load-number 1) (vop x y)
  31   ((immediate zero)
  32    (signed-reg unsigned-reg))
  33   (let ((x (tn-value x)))
  34     (inst li (if (>= x (ash 1 31)) (logior (ash -1 32) x) x) y)))
  35
  36 (define-move-fun (load-character 1) (vop x y)
  37   ((immediate) (character-reg))
  38   (inst li (char-code (tn-value x)) y))
  39
  40 (define-move-fun (load-system-area-pointer 1) (vop x y)
  41   ((immediate) (sap-reg))
  42   (inst li (sap-int (tn-value x)) y))
  43
  44 (define-move-fun (load-constant 5) (vop x y)
  45   ((constant) (descriptor-reg))
  46   (loadw y code-tn (tn-offset x) other-pointer-lowtag))
  47
  48 (define-move-fun (load-stack 5) (vop x y)
  49   ((control-stack) (any-reg descriptor-reg))
  50   (load-stack-tn y x))
  51
  52 (define-move-fun (load-number-stack 5) (vop x y)
  53   ((character-stack) (character-reg)
  54    (sap-stack) (sap-reg)
  55    (signed-stack) (signed-reg)
  56    (unsigned-stack) (unsigned-reg))
  57   (let ((nfp (current-nfp-tn vop)))
  58     (loadw y nfp (tn-offset x))))
  59
  60 (define-move-fun (store-stack 5) (vop x y)
  61   ((any-reg descriptor-reg) (control-stack))
  62   (store-stack-tn y x))
  63
  64 (define-move-fun (store-number-stack 5) (vop x y)
  65   ((character-reg) (character-stack)
  66    (sap-reg) (sap-stack)
  67    (signed-reg) (signed-stack)
  68    (unsigned-reg) (unsigned-stack))
  69   (let ((nfp (current-nfp-tn vop)))
  70     (storew x nfp (tn-offset y))))
  71
  72 \f
  73 ;;;; The Move VOP:
  74 (define-vop (move)
  75   (:args (x :target y
  76             :scs (any-reg descriptor-reg)
  77             :load-if (not (location= x y))))
  78   (:results (y :scs (any-reg descriptor-reg)
  79                :load-if (not (location= x y))))
  80   (:effects)
  81   (:affected)
  82   (:generator 0
  83     (move x y)))
  84
  85 (define-move-vop move :move
  86   (any-reg descriptor-reg)
  87   (any-reg descriptor-reg))
  88
  89 ;;; Make MOVE the check VOP for T so that type check generation
  90 ;;; doesn't think it is a hairy type.  This also allows checking of a
  91 ;;; few of the values in a continuation to fall out.
  92 (primitive-type-vop move (:check) t)
  93
  94 ;;; The MOVE-ARG VOP is used for moving descriptor values into another
  95 ;;; frame for argument or known value passing.
  96 (define-vop (move-arg)
  97   (:args (x :target y
  98             :scs (any-reg descriptor-reg))
  99          (fp :scs (any-reg)
 100              :load-if (not (sc-is y any-reg descriptor-reg))))
 101   (:results (y))
 102   (:generator 0
 103     (sc-case y
 104       ((any-reg descriptor-reg)
 105        (move x y))
 106       (control-stack
 107        (storew x fp (tn-offset y))))))
 108 (define-move-vop move-arg :move-arg
 109   (any-reg descriptor-reg)
 110   (any-reg descriptor-reg))
 111
 112
 113 \f
 114 ;;;; ILLEGAL-MOVE
 115
 116 ;;; This VOP exists just to begin the lifetime of a TN that couldn't
 117 ;;; be written legally due to a type error.  An error is signalled
 118 ;;; before this VOP is so we don't need to do anything (not that there
 119 ;;; would be anything sensible to do anyway.)
 120 (define-vop (illegal-move)
 121   (:args (x) (type))
 122   (:results (y))
 123   (:ignore y)
 124   (:vop-var vop)
 125   (:save-p :compute-only)
 126   (:generator 666
 127     (error-call vop object-not-type-error x type)))
 128 \f
 129 ;;;; Moves and coercions:
 130
 131 ;;; These MOVE-TO-WORD VOPs move a tagged integer to a raw full-word
 132 ;;; representation.  Similarly, the MOVE-FROM-WORD VOPs converts a raw integer
 133 ;;; to a tagged bignum or fixnum.
 134
 135 ;;; ARG is a fixnum, so just shift it.  We need a type restriction
 136 ;;; because some possible arg SCs (control-stack) overlap with
 137 ;;; possible bignum arg SCs.
 138 (define-vop (move-to-word/fixnum)
 139   (:args (x :scs (any-reg descriptor-reg)))
 140   (:results (y :scs (signed-reg unsigned-reg)))
 141   (:arg-types tagged-num)
 142   (:note "fixnum untagging")
 143   (:generator 1
 144     (inst sra x 2 y)))
 145 (define-move-vop move-to-word/fixnum :move
 146   (any-reg descriptor-reg) (signed-reg unsigned-reg))
 147
 148 ;;; ARG is a non-immediate constant, load it.
 149 (define-vop (move-to-word-c)
 150   (:args (x :scs (constant)))
 151   (:results (y :scs (signed-reg unsigned-reg)))
 152   (:note "constant load")
 153   (:generator 1
 154     (inst li (tn-value x) y)))
 155 (define-move-vop move-to-word-c :move
 156   (constant) (signed-reg unsigned-reg))
 157
 158 ;;; ARG is a fixnum or bignum, figure out which and load if necessary.
 159 (define-vop (move-to-word/integer)
 160   (:args (x :scs (descriptor-reg)))
 161   (:results (y :scs (signed-reg unsigned-reg)))
 162   (:note "integer to untagged word coercion")
 163   (:generator 3
 164     (inst extru x 31 2 zero-tn :<>)
 165     (inst sra x 2 y :tr)
 166     (loadw y x bignum-digits-offset other-pointer-lowtag)))
 167 (define-move-vop move-to-word/integer :move
 168   (descriptor-reg) (signed-reg unsigned-reg))
 169
 170 ;;; RESULT is a fixnum, so we can just shift.  We need the result type
 171 ;;; restriction because of the control-stack ambiguity noted above.
 172 (define-vop (move-from-word/fixnum)
 173   (:args (x :scs (signed-reg unsigned-reg)))
 174   (:results (y :scs (any-reg descriptor-reg)))
 175   (:result-types tagged-num)
 176   (:note "fixnum tagging")
 177   (:generator 1
 178     (inst sll x 2 y)))
 179 (define-move-vop move-from-word/fixnum :move
 180   (signed-reg unsigned-reg) (any-reg descriptor-reg))
 181
 182 ;;; RESULT may be a bignum, so we have to check.  Use a worst-case
 183 ;;; cost to make sure people know they may be number consing.
 184 (define-vop (move-from-signed)
 185   (:args (x :scs (signed-reg unsigned-reg) :to (:eval 1)))
 186   (:results (y :scs (any-reg descriptor-reg) :from (:eval 0)))
 187   (:temporary (:scs (non-descriptor-reg)) temp)
 188   (:note "signed word to integer coercion")
 189   (:generator 18
 190     ;; Extract the top three bits.
 191     (inst extrs x 2 3 temp :=)
 192     ;; Invert them (unless they are already zero).
 193     (inst uaddcm zero-tn temp temp)
 194     ;; If we are left with zero, it will fit in a fixnum.  So branch around
 195     ;; the bignum-construction, doing the shift in the delay slot.
 196     (inst comb := temp zero-tn done)
 197     (inst sll x 2 y)
 198     ;; Make a single-digit bignum.
 199     (with-fixed-allocation (y temp bignum-widetag (1+ bignum-digits-offset))
 200       (storew x y bignum-digits-offset other-pointer-lowtag))
 201     DONE))
 202 (define-move-vop move-from-signed :move
 203   (signed-reg) (descriptor-reg))
 204
 205 ;;; Check for fixnum, and possibly allocate one or two word bignum
 206 ;;; result.  Use a worst-case cost to make sure people know they may
 207 ;;; be number consing.
 208 (define-vop (move-from-unsigned)
 209   (:args (x :scs (signed-reg unsigned-reg) :to (:eval 1)))
 210   (:results (y :scs (any-reg descriptor-reg) :from (:eval 0)))
 211   (:temporary (:scs (non-descriptor-reg)) temp)
 212   (:note "unsigned word to integer coercion")
 213   (:generator 20
 214     ;; Grab the top three bits.
 215     (inst extrs x 2 3 temp)
 216     ;; If zero, it will fit as a fixnum.
 217     (inst comib := 0 temp done)
 218     (inst sll x 2 y)
 219     ;; Make a bignum.
 220     (pseudo-atomic (:extra (pad-data-block (1+ bignum-digits-offset)))
 221       ;; Create the result pointer.
 222       (inst move alloc-tn y)
 223       (inst dep other-pointer-lowtag 31 3 y)
 224       ;; Check the high bit, and skip the next instruction if it's 0.
 225       (inst comclr x zero-tn zero-tn :>=)
 226       ;; The high bit is set, so allocate enough space for a two-word bignum.
 227       ;; We always skip the following instruction, so it is only executed
 228       ;; when we want one word.
 229       (inst addi (pad-data-block 1) alloc-tn alloc-tn :tr)
 230       ;; Set up the header for one word.  Use ADDI instead of LI so we can
 231       ;; skip the next instruction.
 232       (inst addi (logior (ash 1 n-widetag-bits) bignum-widetag) zero-tn temp :tr)
 233       ;; Set up the header for two words.
 234       (inst li (logior (ash 2 n-widetag-bits) bignum-widetag) temp)
 235       ;; Store the header and the data.
 236       (storew temp y 0 other-pointer-lowtag)
 237       (storew x y bignum-digits-offset other-pointer-lowtag))
 238     DONE))
 239 (define-move-vop move-from-unsigned :move
 240   (unsigned-reg) (descriptor-reg))
 241
 242 ;;; Move untagged numbers.
 243 (define-vop (word-move)
 244   (:args (x :target y
 245             :scs (signed-reg unsigned-reg)
 246             :load-if (not (location= x y))))
 247   (:results (y :scs (signed-reg unsigned-reg)
 248                :load-if (not (location= x y))))
 249   (:effects)
 250   (:affected)
 251   (:note "word integer move")
 252   (:generator 0
 253     (move x y)))
 254 (define-move-vop word-move :move
 255   (signed-reg unsigned-reg) (signed-reg unsigned-reg))
 256
 257 ;;; Move untagged number args/return-values.
 258 (define-vop (move-word-arg)
 259   (:args (x :target y
 260             :scs (signed-reg unsigned-reg))
 261          (fp :scs (any-reg)
 262              :load-if (not (sc-is y sap-reg))))
 263   (:results (y))
 264   (:note "word integer argument move")
 265   (:generator 0
 266     (sc-case y
 267       ((signed-reg unsigned-reg)
 268        (move x y))
 269       ((signed-stack unsigned-stack)
 270        (storew x fp (tn-offset y))))))
 271 (define-move-vop move-word-arg :move-arg
 272   (descriptor-reg any-reg signed-reg unsigned-reg) (signed-reg unsigned-reg))
 273
 274 ;;; Use standard MOVE-ARG + coercion to move an untagged number to a
 275 ;;; descriptor passing location.
 276 (define-move-vop move-arg :move-arg
 277   (signed-reg unsigned-reg) (any-reg descriptor-reg))