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/* x86-64 __mpn_add_n -- Add two limb vectors of the same length > 0 and store
sum in a third limb vector.
Copyright (C) 2006-2023 Free Software Foundation, Inc.
This file is part of the GNU MP Library.
The GNU MP Library is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or (at your
option) any later version.
The GNU MP Library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public License
along with the GNU MP Library; see the file COPYING.LIB. If not,
see <https://www.gnu.org/licenses/>. */
#include "sysdep.h"
#include "asm-syntax.h"
#define rp %rdi
#define up %rsi
#define vp %rdx
#define n %rcx
#define cy %r8
#ifndef func
# define func __mpn_add_n
# define ADCSBB adc
#endif
.text
ENTRY (func)
xor %r8, %r8
mov (up), %r10
mov (vp), %r11
lea -8(up,n,8), up
lea -8(vp,n,8), vp
lea -16(rp,n,8), rp
mov %ecx, %eax
neg n
and $3, %eax
je L(b00)
add %rax, n /* clear low rcx bits for jrcxz */
cmp $2, %eax
jl L(b01)
je L(b10)
L(b11): shr %r8 /* set cy */
jmp L(e11)
L(b00): shr %r8 /* set cy */
mov %r10, %r8
mov %r11, %r9
lea 4(n), n
jmp L(e00)
L(b01): shr %r8 /* set cy */
jmp L(e01)
L(b10): shr %r8 /* set cy */
mov %r10, %r8
mov %r11, %r9
jmp L(e10)
L(end): ADCSBB %r11, %r10
mov %r10, 8(rp)
mov %ecx, %eax /* clear eax, ecx contains 0 */
adc %eax, %eax
ret
.p2align 4
L(top):
mov -24(up,n,8), %r8
mov -24(vp,n,8), %r9
ADCSBB %r11, %r10
mov %r10, -24(rp,n,8)
L(e00):
mov -16(up,n,8), %r10
mov -16(vp,n,8), %r11
ADCSBB %r9, %r8
mov %r8, -16(rp,n,8)
L(e11):
mov -8(up,n,8), %r8
mov -8(vp,n,8), %r9
ADCSBB %r11, %r10
mov %r10, -8(rp,n,8)
L(e10):
mov (up,n,8), %r10
mov (vp,n,8), %r11
ADCSBB %r9, %r8
mov %r8, (rp,n,8)
L(e01):
jrcxz L(end)
lea 4(n), n
jmp L(top)
END (func)
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