source/libs/gmp/gmp-src/mpn/sh/sub_n.asm

   1 dnl  SH mpn_sub_n -- Subtract two limb vectors of the same length > 0 and store
   2 dnl  difference in a third limb vector.
   3
   4 dnl  Copyright 1995, 1997, 2000, 2011 Free Software Foundation, Inc.
   5
   6 dnl  This file is part of the GNU MP Library.
   7 dnl
   8 dnl  The GNU MP Library is free software; you can redistribute it and/or modify
   9 dnl  it under the terms of either:
  10 dnl
  11 dnl    * the GNU Lesser General Public License as published by the Free
  12 dnl      Software Foundation; either version 3 of the License, or (at your
  13 dnl      option) any later version.
  14 dnl
  15 dnl  or
  16 dnl
  17 dnl    * the GNU General Public License as published by the Free Software
  18 dnl      Foundation; either version 2 of the License, or (at your option) any
  19 dnl      later version.
  20 dnl
  21 dnl  or both in parallel, as here.
  22 dnl
  23 dnl  The GNU MP Library is distributed in the hope that it will be useful, but
  24 dnl  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  25 dnl  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  26 dnl  for more details.
  27 dnl
  28 dnl  You should have received copies of the GNU General Public License and the
  29 dnl  GNU Lesser General Public License along with the GNU MP Library.  If not,
  30 dnl  see https://www.gnu.org/licenses/.
  31
  32
  33 include(`../config.m4')
  34
  35 C INPUT PARAMETERS
  36 C rp            r4
  37 C up            r5
  38 C vp            r6
  39 C n             r7
  40
  41 changecom(blah)                 C disable # to make all C comments below work
  42
  43 ASM_START()
  44 PROLOGUE(mpn_sub_n)
  45         mov     #0,r3           C clear cy save reg
  46
  47 L(top): mov.l   @r5+,r1
  48         mov.l   @r6+,r2
  49         shlr    r3              C restore cy
  50         subc    r2,r1
  51         movt    r3              C save cy
  52         mov.l   r1,@r4
  53         dt      r7
  54         bf.s    L(top)
  55          add    #4,r4
  56
  57         rts
  58         mov     r3,r0           C return carry-out from most significant limb
  59 EPILOGUE()