sysdeps/mips/mips64/addmul_1.S

   1 /* MIPS3 __mpn_addmul_1 -- Multiply a limb vector with a single limb and
   2  * add the product to a second limb vector.
   3  *
   4  * Copyright (C) 1992-2019 Free Software Foundation, Inc.
   5  *
   6  * This file is part of the GNU MP Library.
   7  *
   8  * The GNU MP Library is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU Lesser General Public License as published by
  10  * the Free Software Foundation; either version 2.1 of the License, or (at your
  11  * option) any later version.
  12  *
  13  * The GNU MP Library is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  15  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
  16  * License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public License
  19  * along with the GNU MP Library.  If not, see <https://www.gnu.org/licenses/>.
  20  */
  21
  22 #include <sysdep.h>
  23 #include <sys/asm.h>
  24
  25 /* INPUT PARAMETERS
  26  * res_ptr      $4
  27  * s1_ptr       $5
  28  * size         $6
  29  * s2_limb      $7
  30  */
  31
  32 #ifdef PIC
  33         .option pic2
  34 #endif
  35 ENTRY (__mpn_addmul_1)
  36 #ifdef PIC
  37         SETUP_GP /* ??? unused */
  38 #endif
  39         .set    noreorder
  40         .set    nomacro
  41
  42  # warm up phase 0
  43         ld      $8,0($5)
  44
  45  # warm up phase 1
  46         daddiu  $5,$5,8
  47 #if __mips_isa_rev < 6
  48         dmultu  $8,$7
  49 #else
  50         dmulu   $11,$8,$7
  51         dmuhu   $12,$8,$7
  52 #endif
  53
  54         daddiu  $6,$6,-1
  55         beq     $6,$0,L(LC0)
  56         move    $2,$0           # zero cy2
  57
  58         daddiu  $6,$6,-1
  59         beq     $6,$0,L(LC1)
  60         ld      $8,0($5)        # load new s1 limb as early as possible
  61
  62 L(Loop):        ld      $10,0($4)
  63 #if __mips_isa_rev < 6
  64         mflo    $3
  65         mfhi    $9
  66 #else
  67         move    $3,$11
  68         move    $9,$12
  69 #endif
  70         daddiu  $5,$5,8
  71         daddu   $3,$3,$2        # add old carry limb to low product limb
  72 #if __mips_isa_rev < 6
  73         dmultu  $8,$7
  74 #else
  75         dmulu   $11,$8,$7
  76         dmuhu   $12,$8,$7
  77 #endif
  78         ld      $8,0($5)        # load new s1 limb as early as possible
  79         daddiu  $6,$6,-1        # decrement loop counter
  80         sltu    $2,$3,$2        # carry from previous addition -> $2
  81         daddu   $3,$10,$3
  82         sltu    $10,$3,$10
  83         daddu   $2,$2,$10
  84         sd      $3,0($4)
  85         daddiu  $4,$4,8
  86         bne     $6,$0,L(Loop)
  87         daddu   $2,$9,$2        # add high product limb and carry from addition
  88
  89  # cool down phase 1
  90 L(LC1): ld      $10,0($4)
  91 #if __mips_isa_rev < 6
  92         mflo    $3
  93         mfhi    $9
  94 #else
  95         move    $3,$11
  96         move    $9,$12
  97 #endif
  98         daddu   $3,$3,$2
  99         sltu    $2,$3,$2
 100 #if __mips_isa_rev < 6
 101         dmultu  $8,$7
 102 #else
 103         dmulu   $11,$8,$7
 104         dmuhu   $12,$8,$7
 105 #endif
 106         daddu   $3,$10,$3
 107         sltu    $10,$3,$10
 108         daddu   $2,$2,$10
 109         sd      $3,0($4)
 110         daddiu  $4,$4,8
 111         daddu   $2,$9,$2        # add high product limb and carry from addition
 112
 113  # cool down phase 0
 114 L(LC0): ld      $10,0($4)
 115 #if __mips_isa_rev < 6
 116         mflo    $3
 117         mfhi    $9
 118 #else
 119         move    $3,$11
 120         move    $9,$12
 121 #endif
 122         daddu   $3,$3,$2
 123         sltu    $2,$3,$2
 124         daddu   $3,$10,$3
 125         sltu    $10,$3,$10
 126         daddu   $2,$2,$10
 127         sd      $3,0($4)
 128         j       $31
 129         daddu   $2,$9,$2        # add high product limb and carry from addition
 130
 131 END (__mpn_addmul_1)