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dnl ARM64 mpn_addlshC_n, mpn_sublshC_n, mpn_rsblshC_n.
dnl Contributed to the GNU project by Torbjörn Granlund.
dnl Copyright 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 3.25-3.75
C Cortex-A57 2.18
C X-Gene 2.5
changecom(blah)
define(`rp', `x0')
define(`up', `x1')
define(`vp', `x2')
define(`n', `x3')
ifdef(`DO_add', `
define(`ADDSUB', `adds $1, $2, $3')
define(`ADDSUBC', `adcs $1, $2, $3')
define(`CLRRCY', `adds $1, xzr, xzr')
define(`RETVAL', `adc x0, $1, xzr')
define(`func_n', mpn_addlsh`'LSH`'_n)')
ifdef(`DO_sub', `
define(`ADDSUB', `subs $1, $3, $2')
define(`ADDSUBC', `sbcs $1, $3, $2')
define(`CLRRCY', `subs $1, xzr, xzr')
define(`RETVAL', `cinc x0, $1, cc')
define(`func_n', mpn_sublsh`'LSH`'_n)')
ifdef(`DO_rsb', `
define(`ADDSUB', `subs $1, $2, $3')
define(`ADDSUBC', `sbcs $1, $2, $3')
define(`CLRRCY', `subs $1, xzr, xzr')
define(`RETVAL', `sbc x0, $1, xzr')
define(`func_n', mpn_rsblsh`'LSH`'_n)')
ASM_START()
PROLOGUE(func_n)
lsr x6, n, #2
tbz n, #0, L(bx0)
L(bx1): ldr x5, [up]
tbnz n, #1, L(b11)
L(b01): ldr x11, [vp]
cbz x6, L(1)
ldp x8, x9, [vp,#8]
lsl x13, x11, #LSH
ADDSUB( x15, x13, x5)
str x15, [rp],#8
sub up, up, #24
sub vp, vp, #8
b L(mid)
L(1): lsl x13, x11, #LSH
ADDSUB( x15, x13, x5)
str x15, [rp]
lsr x0, x11, RSH
RETVAL( x0, x1)
ret
L(b11): ldr x9, [vp]
ldp x10, x11, [vp,#8]!
lsl x13, x9, #LSH
ADDSUB( x17, x13, x5)
str x17, [rp],#8
sub up, up, #8
cbz x6, L(end)
b L(top)
L(bx0): tbnz n, #1, L(b10)
L(b00): CLRRCY( x11)
ldp x8, x9, [vp],#-16
sub up, up, #32
b L(mid)
L(b10): CLRRCY( x9)
ldp x10, x11, [vp]
sub up, up, #16
cbz x6, L(end)
ALIGN(16)
L(top): ldp x4, x5, [up,#16]
extr x12, x10, x9, #RSH
ldp x8, x9, [vp,#16]
extr x13, x11, x10, #RSH
ADDSUBC(x14, x12, x4)
ADDSUBC(x15, x13, x5)
stp x14, x15, [rp],#16
L(mid): ldp x4, x5, [up,#32]!
extr x12, x8, x11, #RSH
ldp x10, x11, [vp,#32]!
extr x13, x9, x8, #RSH
ADDSUBC(x16, x12, x4)
ADDSUBC(x17, x13, x5)
stp x16, x17, [rp],#16
sub x6, x6, #1
cbnz x6, L(top)
L(end): ldp x4, x5, [up,#16]
extr x12, x10, x9, #RSH
extr x13, x11, x10, #RSH
ADDSUBC(x14, x12, x4)
ADDSUBC(x15, x13, x5)
stp x14, x15, [rp]
lsr x0, x11, RSH
RETVAL( x0, x1)
ret
EPILOGUE()
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