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dnl ARM mpn_popcount and mpn_hamdist.
dnl Contributed to the GNU project by Torbjörn Granlund.
dnl Copyright 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 popcount hamdist
C cycles/limb cycles/limb
C StrongARM -
C XScale -
C Cortex-A7 ?
C Cortex-A8 ?
C Cortex-A9 8.94 9.47
C Cortex-A15 5.67 6.44
C Architecture requirements:
C v5 -
C v5t -
C v5te ldrd strd
C v6 usada8
C v6t2 -
C v7a -
ifdef(`OPERATION_popcount',`
define(`func',`mpn_popcount')
define(`ap', `r0')
define(`n', `r1')
define(`a0', `r2')
define(`a1', `r3')
define(`s', `r5')
define(`b_01010101', `r6')
define(`b_00110011', `r7')
define(`b_00001111', `r8')
define(`zero', `r9')
define(`POPC', `$1')
define(`HAMD', `dnl')
')
ifdef(`OPERATION_hamdist',`
define(`func',`mpn_hamdist')
define(`ap', `r0')
define(`bp', `r1')
define(`n', `r2')
define(`a0', `r6')
define(`a1', `r7')
define(`b0', `r4')
define(`b1', `r5')
define(`s', `r11')
define(`b_01010101', `r8')
define(`b_00110011', `r9')
define(`b_00001111', `r10')
define(`zero', `r3')
define(`POPC', `dnl')
define(`HAMD', `$1')
')
MULFUNC_PROLOGUE(mpn_popcount mpn_hamdist)
ASM_START()
PROLOGUE(func)
POPC(` push { r4-r9 } ')
HAMD(` push { r4-r11 } ')
ldr b_01010101, =0x55555555
mov r12, #0
ldr b_00110011, =0x33333333
mov zero, #0
ldr b_00001111, =0x0f0f0f0f
tst n, #1
beq L(evn)
L(odd): ldr a1, [ap], #4 C 1 x 32 1-bit accumulators, 0-1
HAMD(` ldr b1, [bp], #4 ') C 1 x 32 1-bit accumulators, 0-1
HAMD(` eor a1, a1, b1 ')
and r4, b_01010101, a1, lsr #1
sub a1, a1, r4
and r4, a1, b_00110011
bic r5, a1, b_00110011
add r5, r4, r5, lsr #2 C 8 4-bit accumulators, 0-4
subs n, n, #1
b L(mid)
L(evn): mov s, #0
L(top): ldrd a0, a1, [ap], #8 C 2 x 32 1-bit accumulators, 0-1
HAMD(` ldrd b0, b1, [bp], #8')
HAMD(` eor a0, a0, b0 ')
HAMD(` eor a1, a1, b1 ')
subs n, n, #2
usada8 r12, s, zero, r12
and r4, b_01010101, a0, lsr #1
sub a0, a0, r4
and r4, b_01010101, a1, lsr #1
sub a1, a1, r4
and r4, a0, b_00110011
bic r5, a0, b_00110011
add a0, r4, r5, lsr #2 C 8 4-bit accumulators, 0-4
and r4, a1, b_00110011
bic r5, a1, b_00110011
add a1, r4, r5, lsr #2 C 8 4-bit accumulators, 0-4
add r5, a0, a1 C 8 4-bit accumulators, 0-8
L(mid): and r4, r5, b_00001111
bic r5, r5, b_00001111
add s, r4, r5, lsr #4 C 4 8-bit accumulators
bne L(top)
usada8 r0, s, zero, r12
POPC(` pop { r4-r9 } ')
HAMD(` pop { r4-r11 } ')
bx r14
EPILOGUE()
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