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dnl X86-64 mpn_add_n, mpn_sub_n, optimised for Intel Atom.
dnl Copyright 2011, 2017 Free Software Foundation, Inc.
dnl Contributed to the GNU project by Marco Bodrato. Ported to 64-bit by
dnl Torbjörn Granlund.
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 AMD K8,K9 2
C AMD K10 2
C AMD bull 2.34\2.63
C AMD pile 2.27\2.52
C AMD steam
C AMD excavator
C AMD bobcat 2.79
C AMD jaguar 2.78
C Intel P4 11
C Intel core2 7.5
C Intel NHM 8.5
C Intel SBR 2.11
C Intel IBR 2.07
C Intel HWL 1.75
C Intel BWL 1.51
C Intel SKL 1.52
C Intel atom 3
C Intel SLM 4
C VIA nano
define(`rp', `%rdi') C rcx
define(`up', `%rsi') C rdx
define(`vp', `%rdx') C r8
define(`n', `%rcx') C r9
define(`cy', `%r8') C rsp+40 (mpn_add_nc and mpn_sub_nc)
ifdef(`OPERATION_add_n', `
define(ADCSBB, adc)
define(func_n, mpn_add_n)
define(func_nc, mpn_add_nc)')
ifdef(`OPERATION_sub_n', `
define(ADCSBB, sbb)
define(func_n, mpn_sub_n)
define(func_nc, mpn_sub_nc)')
MULFUNC_PROLOGUE(mpn_add_n mpn_add_nc mpn_sub_n mpn_sub_nc)
ABI_SUPPORT(DOS64)
ABI_SUPPORT(STD64)
ASM_START()
TEXT
ALIGN(16)
PROLOGUE(func_n)
FUNC_ENTRY(4)
xor cy, cy C carry
L(com): shr n C n >> 1
jz L(1) C n == 1
jc L(1m2) C n % 2 == 1
L(0m2): shr cy
mov (up), %r10
lea 8(up), up
lea 8(vp), vp
lea -8(rp), rp
jmp L(mid)
L(1): shr cy
mov (up), %r9
jmp L(end)
L(1m2): shr cy
mov (up), %r9
ALIGN(16)
L(top): ADCSBB (vp), %r9
lea 16(up), up
mov -8(up), %r10
lea 16(vp), vp
mov %r9, (rp)
L(mid): ADCSBB -8(vp), %r10
lea 16(rp), rp
dec n
mov (up), %r9
mov %r10, -8(rp)
jnz L(top)
L(end): ADCSBB (vp), %r9
mov $0, R32(%rax)
mov %r9, (rp)
adc R32(%rax), R32(%rax)
FUNC_EXIT()
ret
EPILOGUE()
PROLOGUE(func_nc)
FUNC_ENTRY(4)
IFDOS(` mov 56(%rsp), cy ')
jmp L(com)
EPILOGUE()
ASM_END()
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