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dnl ARM64 mpn_bdiv_dbm1c.
dnl Copyright 2008, 2011, 2012, 2014 Free Software Foundation, Inc.
dnl This file is part of the GNU MP Library.
dnl
dnl The GNU MP Library is free software; you can redistribute it and/or modify
dnl it under the terms of either:
dnl
dnl * the GNU Lesser General Public License as published by the Free
dnl Software Foundation; either version 3 of the License, or (at your
dnl option) any later version.
dnl
dnl or
dnl
dnl * the GNU General Public License as published by the Free Software
dnl Foundation; either version 2 of the License, or (at your option) any
dnl later version.
dnl
dnl or both in parallel, as here.
dnl
dnl The GNU MP Library is distributed in the hope that it will be useful, but
dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
dnl for more details.
dnl
dnl You should have received copies of the GNU General Public License and the
dnl GNU Lesser General Public License along with the GNU MP Library. If not,
dnl see https://www.gnu.org/licenses/.
include(`../config.m4')
C cycles/limb
C Cortex-A53 8
C Cortex-A57 7
C X-Gene 4.25
define(`qp', `x0')
define(`up', `x1')
define(`n', `x2')
define(`bd', `x3')
define(`cy', `x4')
ASM_START()
TEXT
ALIGN(16)
PROLOGUE(mpn_bdiv_dbm1c)
ldr x5, [up], #8
ands x6, n, #3
b.eq L(fi0)
cmp x6, #2
b.cc L(fi1)
b.eq L(fi2)
L(fi3): mul x12, x5, bd
umulh x13, x5, bd
ldr x5, [up], #8
b L(lo3)
L(fi0): mul x10, x5, bd
umulh x11, x5, bd
ldr x5, [up], #8
b L(lo0)
L(fi1): subs n, n, #1
mul x12, x5, bd
umulh x13, x5, bd
b.ls L(wd1)
ldr x5, [up], #8
b L(lo1)
L(fi2): mul x10, x5, bd
umulh x11, x5, bd
ldr x5, [up], #8
b L(lo2)
L(top): ldr x5, [up], #8
subs x4, x4, x10
str x4, [qp], #8
sbc x4, x4, x11
L(lo1): mul x10, x5, bd
umulh x11, x5, bd
ldr x5, [up], #8
subs x4, x4, x12
str x4, [qp], #8
sbc x4, x4, x13
L(lo0): mul x12, x5, bd
umulh x13, x5, bd
ldr x5, [up], #8
subs x4, x4, x10
str x4, [qp], #8
sbc x4, x4, x11
L(lo3): mul x10, x5, bd
umulh x11, x5, bd
ldr x5, [up], #8
subs x4, x4, x12
str x4, [qp], #8
sbc x4, x4, x13
L(lo2): subs n, n, #4
mul x12, x5, bd
umulh x13, x5, bd
b.hi L(top)
L(wd2): subs x4, x4, x10
str x4, [qp], #8
sbc x4, x4, x11
L(wd1): subs x4, x4, x12
str x4, [qp]
sbc x0, x4, x13
ret
EPILOGUE()
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