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dnl ARM v6 mpn_bdiv_q_1, mpn_pi1_bdiv_q_1 -- Hensel division by 1-limb divisor.
dnl This is v6 code but it runs well on just the v7a Cortex-A8, A9, and A15.
dnl Contributed to the GNU project by Torbjörn Granlund.
dnl Copyright 2012, 2013, 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 1176 - -
C Cortex-A5 9 13
C Cortex-A7 12 18
C Cortex-A8 13 14
C Cortex-A9 9 10 not measured since latest edits
C Cortex-A15 7 7
C Cortex-A53 16 24
C Architecture requirements:
C v5 -
C v5t clz
C v5te -
C v6 umaal
C v6t2 -
C v7a -
define(`rp', `r0')
define(`up', `r1')
define(`n', `r2')
define(`d', `r3')
define(`di_arg', `sp[0]') C just mpn_pi1_bdiv_q_1
define(`cnt_arg', `sp[4]') C just mpn_pi1_bdiv_q_1
define(`cy', `r7')
define(`cnt', `r6')
define(`tnc', `r4')
ASM_START()
PROLOGUE(mpn_bdiv_q_1)
push {r6-r11}
rsb r10, d, #0
and r10, r10, d
clz r10, r10
rsbs cnt, r10, #31 C count_trailing_zeros
mov d, d, lsr cnt
C binvert limb
LEA( r10, binvert_limb_table)
and r12, d, #254
ldrb r10, [r10, r12, lsr #1]
mul r12, r10, r10
mul r12, d, r12
rsb r12, r12, r10, lsl #1
mul r10, r12, r12
mul r10, d, r10
rsb r10, r10, r12, lsl #1 C r10 = inverse
b L(pi1)
EPILOGUE()
PROLOGUE(mpn_pi1_bdiv_q_1)
push {r6-r11}
ldr cnt, [sp, #28]
ldr r10, [sp, #24]
cmp cnt, #0
L(pi1): ldr r11, [up], #4 C up[0]
mov cy, #0
rsb r8, r10, #0 C r8 = -inverse
bne L(unorm)
L(norm):
subs n, n, #1
mul r11, r11, r10
beq L(edn)
ALIGN(16)
L(tpn): ldr r9, [up], #4
mov r12, #0
str r11, [rp], #4
umaal r12, cy, r11, d
mul r11, r9, r10
mla r11, cy, r8, r11
subs n, n, #1
bne L(tpn)
L(edn): str r11, [rp]
pop {r6-r11}
bx r14
L(unorm):
push {r4-r5}
rsb tnc, cnt, #32
mov r5, r11, lsr cnt
subs n, n, #1
beq L(ed1)
ldr r12, [up], #4
orr r9, r5, r12, lsl tnc
mov r5, r12, lsr cnt
mul r11, r9, r10
subs n, n, #1
beq L(edu)
ALIGN(16)
L(tpu): ldr r12, [up], #4
orr r9, r5, r12, lsl tnc
mov r5, r12, lsr cnt
mov r12, #0
str r11, [rp], #4
umaal r12, cy, r11, d
mul r11, r9, r10
mla r11, cy, r8, r11
subs n, n, #1
bne L(tpu)
L(edu): str r11, [rp], #4
mov r12, #0
umaal r12, cy, r11, d
mul r11, r5, r10
mla r11, cy, r8, r11
str r11, [rp]
pop {r4-r11}
bx r14
L(ed1): mul r11, r5, r10
str r11, [rp]
pop {r4-r11}
bx r14
EPILOGUE()
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