sysdeps/alpha/alphaev5/rshift.s

   1  # Alpha EV5 __mpn_rshift --
   2
   3  # Copyright (C) 1994, 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 Lesser General Public License as published by
   9  # the Free Software Foundation; either version 2.1 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 Lesser General Public
  15  # License for more details.
  16
  17  # You should have received a copy of the GNU Lesser 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      r16
  25  # s1_ptr       r17
  26  # size         r18
  27  # cnt          r19
  28
  29  # This code runs at 3.25 cycles/limb on the EV5.
  30
  31         .set    noreorder
  32         .set    noat
  33 .text
  34         .align  3
  35         .globl  __mpn_rshift
  36         .ent    __mpn_rshift
  37 __mpn_rshift:
  38         .frame  $30,0,$26,0
  39
  40         ldq     $4,0($17)       # load first limb
  41         subq    $31,$19,$20
  42         subq    $18,1,$18
  43         and     $18,4-1,$28     # number of limbs in first loop
  44         sll     $4,$20,$0       # compute function result
  45
  46         beq     $28,.L0
  47         subq    $18,$28,$18
  48
  49         .align  3
  50 .Loop0: ldq     $3,8($17)
  51         addq    $16,8,$16
  52         srl     $4,$19,$5
  53         addq    $17,8,$17
  54         subq    $28,1,$28
  55         sll     $3,$20,$6
  56         or      $3,$3,$4
  57         or      $5,$6,$8
  58         stq     $8,-8($16)
  59         bne     $28,.Loop0
  60
  61 .L0:    srl     $4,$19,$24
  62         beq     $18,.Lend
  63  # warm up phase 1
  64         ldq     $1,8($17)
  65         subq    $18,4,$18
  66         ldq     $2,16($17)
  67         ldq     $3,24($17)
  68         ldq     $4,32($17)
  69         beq     $18,.Lend1
  70  # warm up phase 2
  71         sll     $1,$20,$7
  72         srl     $1,$19,$21
  73         sll     $2,$20,$8
  74         ldq     $1,40($17)
  75         srl     $2,$19,$22
  76         ldq     $2,48($17)
  77         sll     $3,$20,$5
  78         or      $7,$24,$7
  79         srl     $3,$19,$23
  80         or      $8,$21,$8
  81         sll     $4,$20,$6
  82         ldq     $3,56($17)
  83         srl     $4,$19,$24
  84         ldq     $4,64($17)
  85         subq    $18,4,$18
  86         beq     $18,.Lend2
  87         .align  4
  88  # main loop
  89 .Loop:  stq     $7,0($16)
  90         or      $5,$22,$5
  91         stq     $8,8($16)
  92         or      $6,$23,$6
  93
  94         sll     $1,$20,$7
  95         subq    $18,4,$18
  96         srl     $1,$19,$21
  97         unop    # ldq   $31,-96($17)
  98
  99         sll     $2,$20,$8
 100         ldq     $1,72($17)
 101         srl     $2,$19,$22
 102         ldq     $2,80($17)
 103
 104         stq     $5,16($16)
 105         or      $7,$24,$7
 106         stq     $6,24($16)
 107         or      $8,$21,$8
 108
 109         sll     $3,$20,$5
 110         unop    # ldq   $31,-96($17)
 111         srl     $3,$19,$23
 112         addq    $16,32,$16
 113
 114         sll     $4,$20,$6
 115         ldq     $3,88($17)
 116         srl     $4,$19,$24
 117         ldq     $4,96($17)
 118
 119         addq    $17,32,$17
 120         bne     $18,.Loop
 121  # cool down phase 2/1
 122 .Lend2: stq     $7,0($16)
 123         or      $5,$22,$5
 124         stq     $8,8($16)
 125         or      $6,$23,$6
 126         sll     $1,$20,$7
 127         srl     $1,$19,$21
 128         sll     $2,$20,$8
 129         srl     $2,$19,$22
 130         stq     $5,16($16)
 131         or      $7,$24,$7
 132         stq     $6,24($16)
 133         or      $8,$21,$8
 134         sll     $3,$20,$5
 135         srl     $3,$19,$23
 136         sll     $4,$20,$6
 137         srl     $4,$19,$24
 138  # cool down phase 2/2
 139         stq     $7,32($16)
 140         or      $5,$22,$5
 141         stq     $8,40($16)
 142         or      $6,$23,$6
 143         stq     $5,48($16)
 144         stq     $6,56($16)
 145  # cool down phase 2/3
 146         stq     $24,64($16)
 147         ret     $31,($26),1
 148
 149  # cool down phase 1/1
 150 .Lend1: sll     $1,$20,$7
 151         srl     $1,$19,$21
 152         sll     $2,$20,$8
 153         srl     $2,$19,$22
 154         sll     $3,$20,$5
 155         or      $7,$24,$7
 156         srl     $3,$19,$23
 157         or      $8,$21,$8
 158         sll     $4,$20,$6
 159         srl     $4,$19,$24
 160  # cool down phase 1/2
 161         stq     $7,0($16)
 162         or      $5,$22,$5
 163         stq     $8,8($16)
 164         or      $6,$23,$6
 165         stq     $5,16($16)
 166         stq     $6,24($16)
 167         stq     $24,32($16)
 168         ret     $31,($26),1
 169
 170 .Lend:  stq     $24,0($16)
 171         ret     $31,($26),1
 172         .end    __mpn_rshift