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dnl ARM64 mpn_bdiv_q_1, mpn_pi1_bdiv_q_1 -- Hensel division by 1-limb divisor.
dnl Contributed to the GNU project by Torbjörn Granlund.
dnl Copyright 2012, 2017 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 norm unorm
C Cortex-A53 12 15
C Cortex-A57 12 12
C Cortex-A72
C Cortex-A73
C X-Gene 11 11
C TODO
C * Scheduling of umulh later in the unorm loop brings A53 time to 12 c/l.
C Unfortunately, that requires software pipelining.
define(`rp', `x0')
define(`up', `x1')
define(`n', `x2')
define(`d', `x3')
define(`di', `x4') C just mpn_pi1_bdiv_q_1
define(`cnt', `x5') C just mpn_pi1_bdiv_q_1
define(`cy', `r7')
define(`tnc', `x8')
ASM_START()
PROLOGUE(mpn_bdiv_q_1)
rbit x6, d
clz cnt, x6
lsr d, d, cnt
LEA_HI( x7, binvert_limb_table)
ubfx x6, d, 1, 7
LEA_LO( x7, binvert_limb_table)
ldrb w6, [x7, x6]
ubfiz x7, x6, 1, 8
umull x6, w6, w6
msub x6, x6, d, x7
lsl x7, x6, 1
mul x6, x6, x6
msub x6, x6, d, x7
lsl x7, x6, 1
mul x6, x6, x6
msub di, x6, d, x7
b GSYM_PREFIX`'mpn_pi1_bdiv_q_1
EPILOGUE()
PROLOGUE(mpn_pi1_bdiv_q_1)
sub n, n, #1
subs x6, x6, x6 C clear r6 and C flag
ldr x9, [up],#8
cbz cnt, L(norm)
L(unorm):
lsr x12, x9, cnt
cbz n, L(eu1)
sub tnc, xzr, cnt
L(tpu): ldr x9, [up],#8
lsl x7, x9, tnc
orr x7, x7, x12
sbcs x6, x7, x6
mul x7, x6, di
str x7, [rp],#8
lsr x12, x9, cnt
umulh x6, x7, d
sub n, n, #1
cbnz n, L(tpu)
L(eu1): sbcs x6, x12, x6
mul x6, x6, di
str x6, [rp]
ret
L(norm):
mul x5, x9, di
str x5, [rp],#8
cbz n, L(en1)
L(tpn): ldr x9, [up],#8
umulh x5, x5, d
sbcs x5, x9, x5
mul x5, x5, di
str x5, [rp],#8
sub n, n, #1
cbnz n, L(tpn)
L(en1): ret
EPILOGUE()
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