sysdeps/z8000/mul_1.s

   1 ! Z8000 __mpn_mul_1 -- Multiply a limb vector with a limb and store
   2 ! the result in a second limb vector.
   3
   4 ! Copyright (C) 1993, 1994, 1995 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 Library General Public License as published by
  10 ! the Free Software Foundation; either version 2 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 Library General Public
  16 ! License for more details.
  17
  18 ! You should have received a copy of the GNU Library General Public License
  19 ! along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
  20 ! the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
  21 ! MA 02111-1307, USA.
  22
  23
  24 ! INPUT PARAMETERS
  25 ! res_ptr       r7
  26 ! s1_ptr        r6
  27 ! size          r5
  28 ! s2_limb       r4
  29
  30         unseg
  31         .text
  32         even
  33         global ___mpn_mul_1
  34 ___mpn_mul_1:
  35         sub     r2,r2           ! zero carry limb
  36         and     r4,r4
  37         jr      mi,Lneg
  38
  39 Lpos:   pop     r1,@r6
  40         ld      r9,r1
  41         mult    rr8,r4
  42         and     r1,r1           ! shift msb of loaded limb into cy
  43         jr      mi,Lp           ! branch if loaded limb's msb is set
  44         add     r8,r4           ! hi_limb += sign_comp2
  45 Lp:     add     r9,r2           ! lo_limb += cy_limb
  46         xor     r2,r2
  47         adc     r2,r8
  48         ld      @r7,r9
  49         inc     r7,#2
  50         dec     r5
  51         jr      ne,Lpos
  52         ret t
  53
  54 Lneg:   pop     r1,@r6
  55         ld      r9,r1
  56         mult    rr8,r4
  57         add     r8,r1           ! hi_limb += sign_comp1
  58         and     r1,r1
  59         jr      mi,Ln
  60         add     r8,r4           ! hi_limb += sign_comp2
  61 Ln:     add     r9,r2           ! lo_limb += cy_limb
  62         xor     r2,r2
  63         adc     r2,r8
  64         ld      @r7,r9
  65         inc     r7,#2
  66         dec     r5
  67         jr      ne,Lneg
  68         ret t