sysdeps/mips/lshift.s

   1  # MIPS2 __mpn_lshift --
   2
   3  # Copyright (C) 1995 Free Software Foundation, Inc.
   4
   5  # This file is part of the GNU MP Library.
   6
   7  # The GNU MP Library is free software; you can redistribute it and/or modify
   8  # it under the terms of the GNU Library General Public License as published by
   9  # the Free Software Foundation; either version 2 of the License, or (at your
  10  # option) any later version.
  11
  12  # The GNU MP Library is distributed in the hope that it will be useful, but
  13  # WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  14  # or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
  15  # License for more details.
  16
  17  # You should have received a copy of the GNU Library General Public License
  18  # along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
  19  # the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
  20  # MA 02111-1307, USA.
  21
  22
  23  # INPUT PARAMETERS
  24  # res_ptr      $4
  25  # src_ptr      $5
  26  # size         $6
  27  # cnt          $7
  28
  29         .text
  30         .align  2
  31         .globl  __mpn_lshift
  32         .ent    __mpn_lshift
  33 __mpn_lshift:
  34         .set    noreorder
  35         .set    nomacro
  36
  37         sll     $2,$6,2
  38         addu    $5,$5,$2        # make r5 point at end of src
  39         lw      $10,-4($5)      # load first limb
  40         subu    $13,$0,$7
  41         addu    $4,$4,$2        # make r4 point at end of res
  42         addiu   $6,$6,-1
  43         and     $9,$6,4-1       # number of limbs in first loop
  44         beq     $9,$0,.L0       # if multiple of 4 limbs, skip first loop
  45          srl    $2,$10,$13      # compute function result
  46
  47         subu    $6,$6,$9
  48
  49 .Loop0: lw      $3,-8($5)
  50         addiu   $4,$4,-4
  51         addiu   $5,$5,-4
  52         addiu   $9,$9,-1
  53         sll     $11,$10,$7
  54         srl     $12,$3,$13
  55         move    $10,$3
  56         or      $8,$11,$12
  57         bne     $9,$0,.Loop0
  58          sw     $8,0($4)
  59
  60 .L0:    beq     $6,$0,.Lend
  61          nop
  62
  63 .Loop:  lw      $3,-8($5)
  64         addiu   $4,$4,-16
  65         addiu   $6,$6,-4
  66         sll     $11,$10,$7
  67         srl     $12,$3,$13
  68
  69         lw      $10,-12($5)
  70         sll     $14,$3,$7
  71         or      $8,$11,$12
  72         sw      $8,12($4)
  73         srl     $9,$10,$13
  74
  75         lw      $3,-16($5)
  76         sll     $11,$10,$7
  77         or      $8,$14,$9
  78         sw      $8,8($4)
  79         srl     $12,$3,$13
  80
  81         lw      $10,-20($5)
  82         sll     $14,$3,$7
  83         or      $8,$11,$12
  84         sw      $8,4($4)
  85         srl     $9,$10,$13
  86
  87         addiu   $5,$5,-16
  88         or      $8,$14,$9
  89         bgtz    $6,.Loop
  90          sw     $8,0($4)
  91
  92 .Lend:  sll     $8,$10,$7
  93         j       $31
  94         sw      $8,-4($4)
  95         .end    __mpn_lshift