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dnl ARM v6 mpn_divexact_1
dnl Contributed to the GNU project by Torbjörn Granlund.
dnl Copyright 2012, 2013 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 cycles/limb
C norm unorm modexact_1c_odd
C StrongARM - -
C XScale - -
C Cortex-A7 ? ?
C Cortex-A8 ? ?
C Cortex-A9 9 10 9
C Cortex-A15 7 7 7
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(`cy', `r7')
define(`cnt', `r6')
define(`tnc', `r10')
ASM_START()
PROLOGUE(mpn_divexact_1)
push {r4,r5,r6,r7,r8,r9}
tst d, #1
rsb r4, d, #0
and r4, r4, d
clz r4, r4
rsb cnt, r4, #31 C count_trailing_zeros
mov d, d, lsr cnt
C binvert limb
LEA( r4, binvert_limb_table)
and r12, d, #254
ldrb r4, [r4, r12, lsr #1]
mul r12, r4, r4
mul r12, d, r12
rsb r12, r12, r4, lsl #1
mul r4, r12, r12
mul r4, d, r4
rsb r4, r4, r12, lsl #1 C r4 = inverse
ldr r5, [up], #4 C up[0]
mov cy, #0
rsb r8, r4, #0 C r8 = -inverse
beq L(unnorm)
L(norm):
subs n, n, #1
mul r5, r5, r4
beq L(end)
ALIGN(16)
L(top): ldr r9, [up], #4
mov r12, #0
str r5, [rp], #4
umaal r12, cy, r5, d
mul r5, r9, r4
mla r5, cy, r8, r5
subs n, n, #1
bne L(top)
L(end): str r5, [rp]
pop {r4,r5,r6,r7,r8,r9}
bx r14
L(unnorm):
push {r10,r11}
rsb tnc, cnt, #32
mov r11, r5, lsr cnt
subs n, n, #1
beq L(edx)
ldr r12, [up], #4
orr r9, r11, r12, lsl tnc
mov r11, r12, lsr cnt
mul r5, r9, r4
subs n, n, #1
beq L(edu)
ALIGN(16)
L(tpu): ldr r12, [up], #4
orr r9, r11, r12, lsl tnc
mov r11, r12, lsr cnt
mov r12, #0
str r5, [rp], #4
umaal r12, cy, r5, d
mul r5, r9, r4
mla r5, cy, r8, r5
subs n, n, #1
bne L(tpu)
L(edu): str r5, [rp], #4
mov r12, #0
umaal r12, cy, r5, d
mul r5, r11, r4
mla r5, cy, r8, r5
str r5, [rp]
pop {r10,r11}
pop {r4,r5,r6,r7,r8,r9}
bx r14
L(edx): mul r5, r11, r4
str r5, [rp]
pop {r10,r11}
pop {r4,r5,r6,r7,r8,r9}
bx r14
EPILOGUE()
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