src/compiler/sparc/subprim.lisp

   1 ;;;; linkage information for standard static functions, and random 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 \f
  14 ;;;; LENGTH
  15 (define-vop (length/list)
  16   (:translate length)
  17   (:args (object :scs (descriptor-reg) :target ptr))
  18   (:arg-types list)
  19   (:temporary (:scs (descriptor-reg) :from (:argument 0)) ptr)
  20   (:temporary (:scs (non-descriptor-reg)) temp)
  21   (:temporary (:scs (any-reg) :type fixnum :to (:result 0) :target result)
  22               count)
  23   (:results (result :scs (any-reg descriptor-reg)))
  24   (:policy :fast-safe)
  25   (:vop-var vop)
  26   (:save-p :compute-only)
  27   (:generator 50
  28     (let ((done (gen-label))
  29           (loop (gen-label))
  30           (not-list (generate-cerror-code vop object-not-list-error object)))
  31       (move ptr object)
  32       (move count zero-tn)
  33
  34       (emit-label loop)
  35
  36       (inst cmp ptr null-tn)
  37       (inst b :eq done)
  38       (inst nop)
  39
  40       ;; FIXME: Maybe rewrite this to remove this TEST-TYPE (and the
  41       ;; one below) to put it in line with all other architectures
  42       ;; (apart from PPC)?
  43       (test-type ptr not-list t (list-pointer-lowtag) :temp temp)
  44
  45       (loadw ptr ptr cons-cdr-slot list-pointer-lowtag)
  46       (inst add count count (fixnumize 1))
  47       (test-type ptr loop nil (list-pointer-lowtag) :temp temp)
  48
  49       (cerror-call vop done object-not-list-error ptr)
  50
  51       (emit-label done)
  52       (move result count))))
  53
  54
  55 (define-static-fun length (object) :translate length)
  56