source/libs/gmp/gmp-src/mpn/arm64/bdiv_dbm1c.asm

   1 dnl  ARM64 mpn_bdiv_dbm1c.
   2
   3 dnl  Copyright 2008, 2011, 2012, 2014 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 Cortex-A53     ?
  35 C Cortex-A57     ?
  36
  37 define(`qp',      `x0')
  38 define(`up',      `x1')
  39 define(`n',       `x2')
  40 define(`bd',      `x3')
  41 define(`cy',      `x4')
  42
  43 ASM_START()
  44         TEXT
  45         ALIGN(16)
  46 PROLOGUE(mpn_bdiv_dbm1c)
  47         ldr     x5, [up], #8
  48         ands    x6, n, #3
  49         b.eq    L(fi0)
  50         cmp     x6, #2
  51         b.cc    L(fi1)
  52         b.eq    L(fi2)
  53
  54 L(fi3): mul     x12, x5, bd
  55         umulh   x13, x5, bd
  56         ldr     x5, [up], #8
  57         b       L(lo3)
  58
  59 L(fi0): mul     x10, x5, bd
  60         umulh   x11, x5, bd
  61         ldr     x5, [up], #8
  62         b       L(lo0)
  63
  64 L(fi1): subs    n, n, #1
  65         mul     x12, x5, bd
  66         umulh   x13, x5, bd
  67         b.ls    L(wd1)
  68         ldr     x5, [up], #8
  69         b       L(lo1)
  70
  71 L(fi2): mul     x10, x5, bd
  72         umulh   x11, x5, bd
  73         ldr     x5, [up], #8
  74         b       L(lo2)
  75
  76 L(top): ldr     x5, [up], #8
  77         subs    x4, x4, x10
  78         str     x4, [qp], #8
  79         sbc     x4, x4, x11
  80 L(lo1): mul     x10, x5, bd
  81         umulh   x11, x5, bd
  82         ldr     x5, [up], #8
  83         subs    x4, x4, x12
  84         str     x4, [qp], #8
  85         sbc     x4, x4, x13
  86 L(lo0): mul     x12, x5, bd
  87         umulh   x13, x5, bd
  88         ldr     x5, [up], #8
  89         subs    x4, x4, x10
  90         str     x4, [qp], #8
  91         sbc     x4, x4, x11
  92 L(lo3): mul     x10, x5, bd
  93         umulh   x11, x5, bd
  94         ldr     x5, [up], #8
  95         subs    x4, x4, x12
  96         str     x4, [qp], #8
  97         sbc     x4, x4, x13
  98 L(lo2): subs    n, n, #4
  99         mul     x12, x5, bd
 100         umulh   x13, x5, bd
 101         b.hi    L(top)
 102
 103 L(wd2): subs    x4, x4, x10
 104         str     x4, [qp], #8
 105         sbc     x4, x4, x11
 106 L(wd1): subs    x4, x4, x12
 107         str     x4, [qp]
 108         sbc     x0, x4, x13
 109         ret
 110 EPILOGUE()