source/libs/gmp/gmp-src/mpn/mips32/sub_n.asm

   1 dnl  MIPS32 mpn_sub_n -- Subtract two limb vectors of the same length > 0 and
   2 dnl  store difference in a third limb vector.
   3
   4 dnl  Copyright 1995, 2000, 2002 Free Software Foundation, Inc.
   5
   6 dnl  This file is part of the GNU MP Library.
   7 dnl
   8 dnl  The GNU MP Library is free software; you can redistribute it and/or modify
   9 dnl  it under the terms of either:
  10 dnl
  11 dnl    * the GNU Lesser General Public License as published by the Free
  12 dnl      Software Foundation; either version 3 of the License, or (at your
  13 dnl      option) any later version.
  14 dnl
  15 dnl  or
  16 dnl
  17 dnl    * the GNU General Public License as published by the Free Software
  18 dnl      Foundation; either version 2 of the License, or (at your option) any
  19 dnl      later version.
  20 dnl
  21 dnl  or both in parallel, as here.
  22 dnl
  23 dnl  The GNU MP Library is distributed in the hope that it will be useful, but
  24 dnl  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  25 dnl  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  26 dnl  for more details.
  27 dnl
  28 dnl  You should have received copies of the GNU General Public License and the
  29 dnl  GNU Lesser General Public License along with the GNU MP Library.  If not,
  30 dnl  see https://www.gnu.org/licenses/.
  31
  32 include(`../config.m4')
  33
  34 C INPUT PARAMETERS
  35 C res_ptr       $4
  36 C s1_ptr        $5
  37 C s2_ptr        $6
  38 C size          $7
  39
  40 ASM_START()
  41 PROLOGUE(mpn_sub_n)
  42         lw      $10,0($5)
  43         lw      $11,0($6)
  44
  45         addiu   $7,$7,-1
  46         and     $9,$7,4-1       C number of limbs in first loop
  47         beq     $9,$0,.L0       C if multiple of 4 limbs, skip first loop
  48          move   $2,$0
  49
  50         subu    $7,$7,$9
  51
  52 .Loop0: addiu   $9,$9,-1
  53         lw      $12,4($5)
  54         addu    $11,$11,$2
  55         lw      $13,4($6)
  56         sltu    $8,$11,$2
  57         subu    $11,$10,$11
  58         sltu    $2,$10,$11
  59         sw      $11,0($4)
  60         or      $2,$2,$8
  61
  62         addiu   $5,$5,4
  63         addiu   $6,$6,4
  64         move    $10,$12
  65         move    $11,$13
  66         bne     $9,$0,.Loop0
  67          addiu  $4,$4,4
  68
  69 .L0:    beq     $7,$0,.Lend
  70          nop
  71
  72 .Loop:  addiu   $7,$7,-4
  73
  74         lw      $12,4($5)
  75         addu    $11,$11,$2
  76         lw      $13,4($6)
  77         sltu    $8,$11,$2
  78         subu    $11,$10,$11
  79         sltu    $2,$10,$11
  80         sw      $11,0($4)
  81         or      $2,$2,$8
  82
  83         lw      $10,8($5)
  84         addu    $13,$13,$2
  85         lw      $11,8($6)
  86         sltu    $8,$13,$2
  87         subu    $13,$12,$13
  88         sltu    $2,$12,$13
  89         sw      $13,4($4)
  90         or      $2,$2,$8
  91
  92         lw      $12,12($5)
  93         addu    $11,$11,$2
  94         lw      $13,12($6)
  95         sltu    $8,$11,$2
  96         subu    $11,$10,$11
  97         sltu    $2,$10,$11
  98         sw      $11,8($4)
  99         or      $2,$2,$8
 100
 101         lw      $10,16($5)
 102         addu    $13,$13,$2
 103         lw      $11,16($6)
 104         sltu    $8,$13,$2
 105         subu    $13,$12,$13
 106         sltu    $2,$12,$13
 107         sw      $13,12($4)
 108         or      $2,$2,$8
 109
 110         addiu   $5,$5,16
 111         addiu   $6,$6,16
 112
 113         bne     $7,$0,.Loop
 114          addiu  $4,$4,16
 115
 116 .Lend:  addu    $11,$11,$2
 117         sltu    $8,$11,$2
 118         subu    $11,$10,$11
 119         sltu    $2,$10,$11
 120         sw      $11,0($4)
 121         j       $31
 122         or      $2,$2,$8
 123 EPILOGUE(mpn_sub_n)