1/* AMD64 __mpn_sub_n -- Add two limb vectors of the same length > 0 and store
2   sum in a third limb vector.
3   Copyright (C) 2004 Free Software Foundation, Inc.
4   This file is part of the GNU MP Library.
5
6   The GNU MP Library is free software; you can redistribute it and/or modify
7   it under the terms of the GNU Lesser General Public License as published by
8   the Free Software Foundation; either version 2.1 of the License, or (at your
9   option) any later version.
10
11   The GNU MP Library is distributed in the hope that it will be useful, but
12   WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
13   or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
14   License for more details.
15
16   You should have received a copy of the GNU Lesser General Public License
17   along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
18   the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
19   MA 02111-1307, USA. */
20
21#include "sysdep.h"
22#include "asm-syntax.h"
23
24	.text
25ENTRY (__mpn_sub_n)
26	leaq	(%rsi,%rcx,8), %rsi
27	leaq	(%rdi,%rcx,8), %rdi
28	leaq	(%rdx,%rcx,8), %rdx
29	negq	%rcx
30	xorl	%eax, %eax		# clear cy
31	.p2align 2
32L(loop):
33	movq	(%rsi,%rcx,8), %rax
34	movq	(%rdx,%rcx,8), %r10
35	sbbq	%r10, %rax
36	movq	%rax, (%rdi,%rcx,8)
37	incq	%rcx
38	jne	L(loop)
39	movq	%rcx, %rax		# zero %rax
40	adcq	%rax, %rax
41	ret
42END (__mpn_sub_n)
43