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) y)))))
  28
  29 (define-move-fun (load-number 1) (vop x y)
  30   ((zero immediate)
  31    (signed-reg unsigned-reg))
  32   (inst li (tn-value x) y))
  33
  34 (define-move-fun (load-character 1) (vop x y)
  35   ((immediate) (character-reg))
  36   (inst li (char-code (tn-value x)) y))
  37
  38 (define-move-fun (load-system-area-pointer 1) (vop x y)
  39   ((immediate) (sap-reg))
  40   (inst li (sap-int (tn-value x)) y))
  41
  42 (define-move-fun (load-constant 5) (vop x y)
  43   ((constant) (descriptor-reg any-reg))
  44   (loadw y code-tn (tn-offset x) other-pointer-lowtag))
  45
  46 (define-move-fun (load-stack 5) (vop x y)
  47   ((control-stack) (any-reg descriptor-reg))
  48   (load-stack-tn y x))
  49
  50 (define-move-fun (load-number-stack 5) (vop x y)
  51   ((character-stack) (character-reg)
  52    (sap-stack) (sap-reg)
  53    (signed-stack) (signed-reg)
  54    (unsigned-stack) (unsigned-reg))
  55   (let ((nfp (current-nfp-tn vop)))
  56     (loadw y nfp (tn-offset x))))
  57
  58 (define-move-fun (store-stack 5) (vop x y)
  59   ((any-reg descriptor-reg null zero) (control-stack))
  60   (store-stack-tn y x))
  61
  62 (define-move-fun (store-number-stack 5) (vop x y)
  63   ((character-reg) (character-stack)
  64    (sap-reg) (sap-stack)
  65    (signed-reg) (signed-stack)
  66    (unsigned-reg) (unsigned-stack))
  67   (let ((nfp (current-nfp-tn vop)))
  68     (storew x nfp (tn-offset y))))
  69
  70 \f
  71 ;;;; The Move VOP:
  72 (define-vop (move)
  73   (:args (x :target y
  74             :scs (any-reg descriptor-reg zero null)
  75             :load-if (not (location= x y))))
  76   (:results (y :scs (any-reg descriptor-reg control-stack)
  77                :load-if (not (location= x y))))
  78   (:effects)
  79   (:affected)
  80   (:generator 0
  81     (unless (location= x y)
  82       (sc-case y
  83         ((any-reg descriptor-reg)
  84           (inst move x y))
  85         (control-stack
  86           (store-stack-tn y x))))))
  87
  88 (define-move-vop move :move
  89   (any-reg descriptor-reg zero null)
  90   (any-reg descriptor-reg))
  91
  92 ;;; Make MOVE the check VOP for T so that type check generation
  93 ;;; doesn't think it is a hairy type.  This also allows checking of a
  94 ;;; few of the values in a continuation to fall out.
  95 (primitive-type-vop move (:check) t)
  96
  97 ;;; The MOVE-ARG VOP is used for moving descriptor values into another
  98 ;;; frame for argument or known value passing.
  99 (define-vop (move-arg)
 100   (:args (x :target y
 101             :scs (any-reg descriptor-reg null zero))
 102          (fp :scs (any-reg)
 103              :load-if (not (sc-is y any-reg descriptor-reg))))
 104   (:results (y))
 105   (:generator 0
 106     (sc-case y
 107       ((any-reg descriptor-reg)
 108        (move x y))
 109       (control-stack
 110        (storew x fp (tn-offset y))))))
 111 (define-move-vop move-arg :move-arg
 112   (any-reg descriptor-reg null zero)
 113   (any-reg descriptor-reg))
 114
 115 \f
 116 ;;;; ILLEGAL-MOVE
 117
 118 ;;; This VOP exists just to begin the lifetime of a TN that couldn't
 119 ;;; be written legally due to a type error.  An error is signalled
 120 ;;; before this VOP is so we don't need to do anything (not that there
 121 ;;; would be anything sensible to do anyway.)
 122 (define-vop (illegal-move)
 123   (:args (x) (type))
 124   (:results (y))
 125   (:ignore y)
 126   (:vop-var vop)
 127   (:save-p :compute-only)
 128   (:generator 666
 129     (error-call vop object-not-type-error x type)))
 130 \f
 131 ;;;; Moves and coercions:
 132
 133 ;;; These MOVE-TO-WORD VOPs move a tagged integer to a raw full-word
 134 ;;; representation.  Similarly, the MOVE-FROM-WORD VOPs converts a raw integer
 135 ;;; to a tagged bignum or fixnum.
 136
 137 ;;; ARG is a fixnum, so just shift it.  We need a type restriction
 138 ;;; because some possible arg SCs (control-stack) overlap with
 139 ;;; possible bignum arg SCs.
 140 (define-vop (move-to-word/fixnum)
 141   (:args (x :scs (any-reg descriptor-reg)))
 142   (:results (y :scs (signed-reg unsigned-reg)))
 143   (:arg-types tagged-num)
 144   (:note "fixnum untagging")
 145   (:generator 1
 146     (inst sra x n-fixnum-tag-bits y)))
 147
 148 (define-move-vop move-to-word/fixnum :move
 149   (any-reg descriptor-reg) (signed-reg unsigned-reg))
 150
 151 ;;; ARG is a non-immediate constant, load it.
 152 (define-vop (move-to-word-c)
 153   (:args (x :scs (constant)))
 154   (:results (y :scs (signed-reg unsigned-reg)))
 155   (:note "constant load")
 156   (:generator 1
 157     (cond ((sb!c::tn-leaf x)
 158            (inst li (tn-value x) y))
 159           (t
 160            (loadw y code-tn (tn-offset x) other-pointer-lowtag)
 161            (inst sra y n-fixnum-tag-bits y)))))
 162
 163 (define-move-vop move-to-word-c :move
 164   (constant) (signed-reg unsigned-reg))
 165
 166 ;;; ARG is a fixnum or bignum, figure out which and load if necessary.
 167 (define-vop (move-to-word/integer)
 168   (:args (x :scs (descriptor-reg)))
 169   (:results (y :scs (signed-reg unsigned-reg)))
 170   (:note "integer to untagged word coercion")
 171   (:generator 3
 172     (inst sra x 2 y)
 173     (inst extru x 31 2 zero-tn :=)
 174     (loadw y x bignum-digits-offset other-pointer-lowtag)))
 175
 176 (define-move-vop move-to-word/integer :move
 177   (descriptor-reg) (signed-reg unsigned-reg))
 178
 179 ;;; RESULT is a fixnum, so we can just shift.  We need the result type
 180 ;;; restriction because of the control-stack ambiguity noted above.
 181 (define-vop (move-from-word/fixnum)
 182   (:args (x :scs (signed-reg unsigned-reg)))
 183   (:results (y :scs (any-reg descriptor-reg)))
 184   (:result-types tagged-num)
 185   (:note "fixnum tagging")
 186   (:generator 1
 187     (inst sll x 2 y)))
 188
 189 (define-move-vop move-from-word/fixnum :move
 190   (signed-reg unsigned-reg) (any-reg descriptor-reg))
 191
 192 ;;; RESULT may be a bignum, so we have to check.  Use a worst-case
 193 ;;; cost to make sure people know they may be number consing.
 194 (define-vop (move-from-signed)
 195   (:args (arg :scs (signed-reg unsigned-reg) :target x))
 196   (:results (y :scs (any-reg descriptor-reg)))
 197   (:temporary (:scs (non-descriptor-reg) :from (:argument 0)) x temp)
 198   (:note "signed word to integer coercion")
 199   (:generator 18
 200     (move arg x)
 201     (let ((done (gen-label)))
 202       ;; Extract the top three bits.
 203       (inst extrs x 2 3 temp :=)
 204       ;; Invert them (unless they are already zero).
 205       (inst uaddcm zero-tn temp temp)
 206       ;; If we are left with zero, it will fit in a fixnum.  So branch around
 207       ;; the bignum-construction, doing the shift in the delay slot.
 208       (inst comb := temp zero-tn done)
 209       (inst sll x 2 y)
 210       ;; Make a single-digit bignum.
 211       (with-fixed-allocation
 212           (y nil temp bignum-widetag (1+ bignum-digits-offset) nil)
 213         (storew x y bignum-digits-offset other-pointer-lowtag))
 214       (emit-label done))))
 215
 216 (define-move-vop move-from-signed :move
 217   (signed-reg) (descriptor-reg))
 218
 219 ;;; Check for fixnum, and possibly allocate one or two word bignum
 220 ;;; result.  Use a worst-case cost to make sure people know they may
 221 ;;; be number consing.
 222 (define-vop (move-from-unsigned)
 223   (:note "unsigned word to integer coercion")
 224   (:args (arg :scs (signed-reg unsigned-reg) :target x))
 225   (:results (y :scs (any-reg descriptor-reg)))
 226   (:temporary (:scs (non-descriptor-reg) :from (:argument 0)) x temp)
 227   (:generator 20
 228     (move arg x)
 229     (inst srl x 29 temp)
 230     (inst comb := temp zero-tn done)
 231     (inst sll x 2 y)
 232     (pseudo-atomic (:extra (pad-data-block (+ bignum-digits-offset 2)))
 233       (set-lowtag other-pointer-lowtag alloc-tn y)
 234       (inst xor temp temp temp)
 235       (inst comclr x zero-tn zero-tn :>=)
 236       (inst li 1 temp)
 237       (inst sll temp n-widetag-bits temp)
 238       (inst addi (logior (ash 1 n-widetag-bits) bignum-widetag) temp temp)
 239       (storew temp y 0 other-pointer-lowtag))
 240
 241     (storew x y bignum-digits-offset other-pointer-lowtag)
 242     DONE))
 243
 244 (define-move-vop move-from-unsigned :move
 245   (unsigned-reg) (descriptor-reg))
 246
 247 ;;; Move untagged numbers.
 248 (define-vop (word-move)
 249   (:args (x :target y
 250             :scs (signed-reg unsigned-reg)
 251             :load-if (not (location= x y))))
 252   (:results (y :scs (signed-reg unsigned-reg)
 253                :load-if (not (location= x y))))
 254   (:effects)
 255   (:affected)
 256   (:note "word integer move")
 257   (:generator 0
 258     (move x y)))
 259
 260 (define-move-vop word-move :move
 261   (signed-reg unsigned-reg) (signed-reg unsigned-reg))
 262
 263 ;;; Move untagged number args/return-values.
 264 (define-vop (move-word-arg)
 265   (:args (x :target y
 266             :scs (signed-reg unsigned-reg))
 267          (fp :scs (any-reg)
 268              :load-if (not (sc-is y sap-reg))))
 269   (:results (y))
 270   (:note "word integer argument move")
 271   (:generator 0
 272     (sc-case y
 273       ((signed-reg unsigned-reg)
 274        (move x y))
 275       ((signed-stack unsigned-stack)
 276        (storew x fp (tn-offset y))))))
 277
 278 (define-move-vop move-word-arg :move-arg
 279   (descriptor-reg any-reg signed-reg unsigned-reg) (signed-reg unsigned-reg))
 280
 281 ;;; Use standard MOVE-ARG + coercion to move an untagged number to a
 282 ;;; descriptor passing location.
 283 (define-move-vop move-arg :move-arg
 284   (signed-reg unsigned-reg) (any-reg descriptor-reg))