src/compiler/sparc/char.lisp

   1 ;;;; the Sparc VM definition of character operations
   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 \f
  14 ;;;; moves and coercions:
  15
  16 ;;; Move a tagged char to an untagged representation.
  17 (define-vop (move-to-character)
  18   (:args (x :scs (any-reg descriptor-reg)))
  19   (:results (y :scs (character-reg)))
  20   (:note "character untagging")
  21   (:generator 1
  22     (inst srl y x n-widetag-bits)))
  23
  24 (define-move-vop move-to-character :move
  25   (any-reg descriptor-reg) (character-reg))
  26
  27
  28 ;;; Move an untagged char to a tagged representation.
  29 (define-vop (move-from-character)
  30   (:args (x :scs (character-reg)))
  31   (:results (y :scs (any-reg descriptor-reg)))
  32   (:note "character tagging")
  33   (:generator 1
  34     (inst sll y x n-widetag-bits)
  35     (inst or y character-widetag)))
  36
  37 (define-move-vop move-from-character :move
  38   (character-reg) (any-reg descriptor-reg))
  39
  40 ;;; Move untagged character values.
  41 (define-vop (character-move)
  42   (:args (x :target y
  43             :scs (character-reg)
  44             :load-if (not (location= x y))))
  45   (:results (y :scs (character-reg)
  46                :load-if (not (location= x y))))
  47   (:note "character move")
  48   (:effects)
  49   (:affected)
  50   (:generator 0
  51     (move y x)))
  52
  53 (define-move-vop character-move :move
  54   (character-reg) (character-reg))
  55
  56
  57 ;;; Move untagged character arguments/return-values.
  58 (define-vop (move-character-arg)
  59   (:args (x :target y
  60             :scs (character-reg))
  61          (fp :scs (any-reg)
  62              :load-if (not (sc-is y character-reg))))
  63   (:results (y))
  64   (:note "character arg move")
  65   (:generator 0
  66     (sc-case y
  67       (character-reg
  68        (move y x))
  69       (character-stack
  70        (storew x fp (tn-offset y))))))
  71
  72 (define-move-vop move-character-arg :move-arg
  73   (any-reg character-reg) (character-reg))
  74
  75
  76 ;;; Use standard MOVE-ARG + coercion to move an untagged character
  77 ;;; to a descriptor passing location.
  78 (define-move-vop move-arg :move-arg
  79   (character-reg) (any-reg descriptor-reg))
  80
  81
  82 \f
  83 ;;;; Other operations:
  84
  85 (define-vop (char-code)
  86   (:translate char-code)
  87   (:policy :fast-safe)
  88   (:args (ch :scs (character-reg) :target res))
  89   (:arg-types character)
  90   (:results (res :scs (any-reg)))
  91   (:result-types positive-fixnum)
  92   (:generator 1
  93     (inst sll res ch n-fixnum-tag-bits)))
  94
  95 (define-vop (code-char)
  96   (:translate code-char)
  97   (:policy :fast-safe)
  98   (:args (code :scs (any-reg) :target res))
  99   (:arg-types positive-fixnum)
 100   (:results (res :scs (character-reg)))
 101   (:result-types character)
 102   (:generator 1
 103     (inst srl res code n-fixnum-tag-bits)))
 104
 105 \f
 106 ;;; Comparison of characters.
 107 (define-vop (character-compare)
 108   (:args (x :scs (character-reg))
 109          (y :scs (character-reg)))
 110   (:arg-types character character)
 111   (:conditional)
 112   (:info target not-p)
 113   (:policy :fast-safe)
 114   (:note "inline comparison")
 115   (:variant-vars condition not-condition)
 116   (:generator 3
 117     (inst cmp x y)
 118     (inst b (if not-p not-condition condition) target)
 119     (inst nop)))
 120
 121 (define-vop (fast-char=/character character-compare)
 122   (:translate char=)
 123   (:variant :eq :ne))
 124
 125 (define-vop (fast-char</character character-compare)
 126   (:translate char<)
 127   (:variant :ltu :geu))
 128
 129 (define-vop (fast-char>/character character-compare)
 130   (:translate char>)
 131   (:variant :gtu :leu))
 132
 133 (define-vop (character-compare/c)
 134   (:args (x :scs (character-reg)))
 135   (:arg-types character (:constant character))
 136   (:conditional)
 137   (:info target not-p y)
 138   (:policy :fast-safe)
 139   (:note "inline constant comparison")
 140   (:variant-vars condition not-condition)
 141   (:generator 2
 142     (inst cmp x (sb!xc:char-code y))
 143     (inst b (if not-p not-condition condition) target)
 144     (inst nop)))
 145
 146 (define-vop (fast-char=/character/c character-compare/c)
 147   (:translate char=)
 148   (:variant :eq :ne))
 149
 150 (define-vop (fast-char</character/c character-compare/c)
 151   (:translate char<)
 152   (:variant :ltu :geu))
 153
 154 (define-vop (fast-char>/character/c character-compare/c)
 155   (:translate char>)
 156   (:variant :gtu :leu))