mpir/mpn/x86_64/add_n.as

;  AMD64 mpn_add_n -- Add two limb vectors of the same length > 0 and store
;  sum in a third limb vector.
;
;  Copyright 2004 Free Software Foundation, Inc.
;
;  Copyright 2008 William Hart
;
;  This file is part of the MPIR Library.
;
;  The MPIR 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 MPIR 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 MPIR Library; see the file COPYING.LIB.  If not, write
;  to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
;  Boston, MA 02110-1301, USA.
;
;         cycles/limb
; Hammer:     3.0
;
;
; INPUT PARAMETERS
; rp	rdi
; up	rsi
; vp	rdx
; n	    rcx

%include 'yasm_mac.inc'

    BITS    64

GLOBAL_FUNC mpn_add_n
	lea	rsi, [rsi+rcx*8]
	lea	rdi, [rdi+rcx*8]
	lea	rdx, [rdx+rcx*8]
	neg	rcx
	xor	eax, eax		            ; clear cy

	align 4                 		; minimal alignment for claimed speed
loop1:	                            ; do the addition in a loop
    mov	rax, [rsi+rcx*8]
	mov	r10, [rdx+rcx*8]
	adc	rax, r10
	mov	[rdi+rcx*8], rax
	inc	rcx
	jne	loop1

	mov	rax, rcx		            ; zero rax
	adc	rax, rax                    ; return carry
	ret