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dnl ARM64 mpn_cnd_add_n, mpn_cnd_sub_n
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 Cortex-A53 3.87-4.37
C Cortex-A57 1.75
C X-Gene 2.0
changecom(blah)
define(`cnd', `x0')
define(`rp', `x1')
define(`up', `x2')
define(`vp', `x3')
define(`n', `x4')
ifdef(`OPERATION_cnd_add_n', `
define(`ADDSUBC', adcs)
define(`CLRCY', `cmn xzr, xzr')
define(`RETVAL', `cset x0, cs')
define(`func', mpn_cnd_add_n)')
ifdef(`OPERATION_cnd_sub_n', `
define(`ADDSUBC', sbcs)
define(`CLRCY', `cmp xzr, xzr')
define(`RETVAL', `cset x0, cc')
define(`func', mpn_cnd_sub_n)')
MULFUNC_PROLOGUE(mpn_cnd_add_n mpn_cnd_sub_n)
ASM_START()
PROLOGUE(func)
cmp cnd, #1
sbc cnd, cnd, cnd
CLRCY
lsr x17, n, #2
tbz n, #0, L(bx0)
L(bx1): ldr x13, [vp]
ldr x11, [up]
bic x7, x13, cnd
ADDSUBC x9, x11, x7
str x9, [rp]
tbnz n, #1, L(b11)
L(b01): cbz x17, L(rt)
ldp x12, x13, [vp,#8]
ldp x10, x11, [up,#8]
sub up, up, #8
sub vp, vp, #8
sub rp, rp, #24
b L(mid)
L(b11): ldp x12, x13, [vp,#8]!
ldp x10, x11, [up,#8]!
sub rp, rp, #8
cbz x17, L(end)
b L(top)
L(bx0): ldp x12, x13, [vp]
ldp x10, x11, [up]
tbnz n, #1, L(b10)
L(b00): sub up, up, #16
sub vp, vp, #16
sub rp, rp, #32
b L(mid)
L(b10): sub rp, rp, #16
cbz x17, L(end)
ALIGN(16)
L(top): bic x6, x12, cnd
bic x7, x13, cnd
ldp x12, x13, [vp,#16]
ADDSUBC x8, x10, x6
ADDSUBC x9, x11, x7
ldp x10, x11, [up,#16]
stp x8, x9, [rp,#16]
L(mid): bic x6, x12, cnd
bic x7, x13, cnd
ldp x12, x13, [vp,#32]!
ADDSUBC x8, x10, x6
ADDSUBC x9, x11, x7
ldp x10, x11, [up,#32]!
stp x8, x9, [rp,#32]!
sub x17, x17, #1
cbnz x17, L(top)
L(end): bic x6, x12, cnd
bic x7, x13, cnd
ADDSUBC x8, x10, x6
ADDSUBC x9, x11, x7
stp x8, x9, [rp,#16]
L(rt): RETVAL
ret
EPILOGUE()
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