source/libs/gmp/gmp-src/mpn/m68k/mc68020/mul_1.asm

   1 dnl  mc68020 mpn_mul_1 -- mpn by limb multiply
   2
   3 dnl  Copyright 1992, 1994, 1996, 1999-2002 Free Software Foundation, Inc.
   4
   5 dnl  This file is part of the GNU MP Library.
   6 dnl
   7 dnl  The GNU MP Library is free software; you can redistribute it and/or modify
   8 dnl  it under the terms of either:
   9 dnl
  10 dnl    * the GNU Lesser General Public License as published by the Free
  11 dnl      Software Foundation; either version 3 of the License, or (at your
  12 dnl      option) any later version.
  13 dnl
  14 dnl  or
  15 dnl
  16 dnl    * the GNU General Public License as published by the Free Software
  17 dnl      Foundation; either version 2 of the License, or (at your option) any
  18 dnl      later version.
  19 dnl
  20 dnl  or both in parallel, as here.
  21 dnl
  22 dnl  The GNU MP Library is distributed in the hope that it will be useful, but
  23 dnl  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  24 dnl  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  25 dnl  for more details.
  26 dnl
  27 dnl  You should have received copies of the GNU General Public License and the
  28 dnl  GNU Lesser General Public License along with the GNU MP Library.  If not,
  29 dnl  see https://www.gnu.org/licenses/.
  30
  31 include(`../config.m4')
  32
  33 C         cycles/limb
  34 C 68040:     24
  35
  36 C INPUT PARAMETERS
  37 C res_ptr       (sp + 4)
  38 C s1_ptr        (sp + 8)
  39 C s1_size       (sp + 12)
  40 C s2_limb       (sp + 16)
  41
  42
  43 define(res_ptr, `a0')
  44 define(s1_ptr,  `a1')
  45 define(s1_size, `d2')
  46 define(s2_limb, `d4')
  47
  48
  49 PROLOGUE(mpn_mul_1)
  50
  51 C Save used registers on the stack.
  52         moveml  d2-d4, M(-,sp)
  53
  54 C       movel   d2, M(-,sp)
  55 C       movel   d3, M(-,sp)
  56 C       movel   d4, M(-,sp)
  57
  58 C Copy the arguments to registers.  Better use movem?
  59         movel   M(sp,16), res_ptr
  60         movel   M(sp,20), s1_ptr
  61         movel   M(sp,24), s1_size
  62         movel   M(sp,28), s2_limb
  63
  64         eorw    #1, s1_size
  65         clrl    d1
  66         lsrl    #1, s1_size
  67         bcc     L(L1)
  68         subql   #1, s1_size
  69         subl    d0, d0          C (d0,cy) <= (0,0)
  70
  71 L(Loop):
  72         movel   M(s1_ptr,+), d3
  73         mulul   s2_limb, d1:d3
  74         addxl   d0, d3
  75         movel   d3, M(res_ptr,+)
  76 L(L1):  movel   M(s1_ptr,+), d3
  77         mulul   s2_limb, d0:d3
  78         addxl   d1, d3
  79         movel   d3, M(res_ptr,+)
  80
  81         dbf     s1_size, L(Loop)
  82         clrl    d3
  83         addxl   d3, d0
  84         subl    #0x10000, s1_size
  85         bcc     L(Loop)
  86
  87 C Restore used registers from stack frame.
  88         moveml  M(sp,+), d2-d4
  89
  90 C       movel   M(sp,+),d4
  91 C       movel   M(sp,+),d3
  92 C       movel   M(sp,+),d2
  93
  94         rts
  95
  96 EPILOGUE(mpn_mul_1)