sysdeps/mips/mips64/lshift.S

   1 /* MIPS3 __mpn_lshift --
   2  *
   3  * Copyright (C) 1995, 2000, 2002, 2003 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 #include <sysdep.h>
  24 #include <sys/asm.h>
  25
  26 /* INPUT PARAMETERS
  27  * res_ptr      $4
  28  * src_ptr      $5
  29  * size         $6
  30  * cnt          $7
  31  */
  32
  33 #ifdef __PIC__
  34         .option pic2
  35 #endif
  36         .text
  37         .align  2
  38         .globl  __mpn_lshift
  39         .ent    __mpn_lshift
  40 __mpn_lshift:
  41 #ifdef __PIC__
  42         SETUP_GP /* ??? unused */
  43 #endif
  44         .set    noreorder
  45         .set    nomacro
  46
  47         dsll    $2,$6,3
  48         daddu   $5,$5,$2        # make r5 point at end of src
  49         ld      $10,-8($5)      # load first limb
  50         dsubu   $13,$0,$7
  51         daddu   $4,$4,$2        # make r4 point at end of res
  52         daddiu  $6,$6,-1
  53         and     $9,$6,4-1       # number of limbs in first loop
  54         beq     $9,$0,L(L0)     # if multiple of 4 limbs, skip first loop
  55         dsrl    $2,$10,$13      # compute function result
  56
  57         dsubu   $6,$6,$9
  58
  59 L(Loop0):       ld      $3,-16($5)
  60         daddiu  $4,$4,-8
  61         daddiu  $5,$5,-8
  62         daddiu  $9,$9,-1
  63         dsll    $11,$10,$7
  64         dsrl    $12,$3,$13
  65         move    $10,$3
  66         or      $8,$11,$12
  67         bne     $9,$0,L(Loop0)
  68         sd      $8,0($4)
  69
  70 L(L0):  beq     $6,$0,L(Lend)
  71         nop
  72
  73 L(Loop):        ld      $3,-16($5)
  74         daddiu  $4,$4,-32
  75         daddiu  $6,$6,-4
  76         dsll    $11,$10,$7
  77         dsrl    $12,$3,$13
  78
  79         ld      $10,-24($5)
  80         dsll    $14,$3,$7
  81         or      $8,$11,$12
  82         sd      $8,24($4)
  83         dsrl    $9,$10,$13
  84
  85         ld      $3,-32($5)
  86         dsll    $11,$10,$7
  87         or      $8,$14,$9
  88         sd      $8,16($4)
  89         dsrl    $12,$3,$13
  90
  91         ld      $10,-40($5)
  92         dsll    $14,$3,$7
  93         or      $8,$11,$12
  94         sd      $8,8($4)
  95         dsrl    $9,$10,$13
  96
  97         daddiu  $5,$5,-32
  98         or      $8,$14,$9
  99         bgtz    $6,L(Loop)
 100         sd      $8,0($4)
 101
 102 L(Lend):        dsll    $8,$10,$7
 103         j       $31
 104         sd      $8,-8($4)
 105         .end    __mpn_lshift