dnl ARM64 Neon mpn_sec_tabselect.
dnl Contributed to the GNU project by Torbjörn Granlund.
dnl Copyright 2011-2014 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 ?
C Cortex-A57 ?
C void
C mpn_sec_tabselect (mp_ptr rp, mp_srcptr *tab,
C mp_size_t n, mp_size_t nents, mp_size_t which)
changecom(@&*$)
define(`rp', `x0')
define(`tp', `x1')
define(`n', `x2')
define(`nents', `x3')
define(`which', `x4')
define(`i', `x5')
define(`j', `x6')
define(`maskq', `v4')
ASM_START()
PROLOGUE(mpn_sec_tabselect)
dup v7.2d, x4 C 2 `which' copies
mov x10, #1
dup v6.2d, x10 C 2 copies of 1
subs j, n, #4
b.mi L(outer_end)
L(outer_top):
mov i, nents
mov x12, tp C preserve tp
movi v5.16b, #0 C zero 2 counter copies
movi v2.16b, #0
movi v3.16b, #0
ALIGN(16)
L(tp4): cmeq maskq.2d, v5.2d, v7.2d C compare idx copies to `which' copies
ld1 {v0.2d,v1.2d}, [tp]
add v5.2d, v5.2d, v6.2d
bit v2.16b, v0.16b, maskq.16b
bit v3.16b, v1.16b, maskq.16b
add tp, tp, n, lsl #3
sub i, i, #1
cbnz i, L(tp4)
st1 {v2.2d,v3.2d}, [rp], #32
add tp, x12, #32 C restore tp, point to next slice
subs j, j, #4
b.pl L(outer_top)
L(outer_end):
tbz n, #1, L(b0x)
mov i, nents
mov x12, tp
movi v5.16b, #0 C zero 2 counter copies
movi v2.16b, #0
ALIGN(16)
L(tp2): cmeq maskq.2d, v5.2d, v7.2d
ld1 {v0.2d}, [tp]
add v5.2d, v5.2d, v6.2d
bit v2.16b, v0.16b, maskq.16b
add tp, tp, n, lsl #3
sub i, i, #1
cbnz i, L(tp2)
st1 {v2.2d}, [rp], #16
add tp, x12, #16
L(b0x): tbz n, #0, L(b00)
mov i, nents
mov x12, tp
movi v5.16b, #0 C zero 2 counter copies
movi v2.16b, #0
ALIGN(16)
L(tp1): cmeq maskq.2d, v5.2d, v7.2d
ld1 {v0.1d}, [tp]
add v5.2d, v5.2d, v6.2d C FIXME size should be `1d'
bit v2.8b, v0.8b, maskq.8b
add tp, tp, n, lsl #3
sub i, i, #1
cbnz i, L(tp1)
st1 {v2.1d}, [rp], #8
add tp, x12, #8
L(b00): ret
EPILOGUE()