github.com/aergoio/aergo@v1.3.1/libtool/src/gmp-6.1.2/mpn/vax/sub_n.asm (about)

     1  dnl  VAX mpn_sub_n -- Subtract two limb vectors of the same length > 0 and
     2  dnl  store difference in a third limb vector.
     3  
     4  dnl  Copyright 1999, 2000, 2012 Free Software Foundation, Inc.
     5  
     6  dnl  This file is part of the GNU MP Library.
     7  dnl
     8  dnl  The GNU MP Library is free software; you can redistribute it and/or modify
     9  dnl  it under the terms of either:
    10  dnl
    11  dnl    * the GNU Lesser General Public License as published by the Free
    12  dnl      Software Foundation; either version 3 of the License, or (at your
    13  dnl      option) any later version.
    14  dnl
    15  dnl  or
    16  dnl
    17  dnl    * the GNU General Public License as published by the Free Software
    18  dnl      Foundation; either version 2 of the License, or (at your option) any
    19  dnl      later version.
    20  dnl
    21  dnl  or both in parallel, as here.
    22  dnl
    23  dnl  The GNU MP Library is distributed in the hope that it will be useful, but
    24  dnl  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
    25  dnl  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    26  dnl  for more details.
    27  dnl
    28  dnl  You should have received copies of the GNU General Public License and the
    29  dnl  GNU Lesser General Public License along with the GNU MP Library.  If not,
    30  dnl  see https://www.gnu.org/licenses/.
    31  
    32  include(`../config.m4')
    33  
    34  ASM_START()
    35  PROLOGUE(mpn_sub_n)
    36  	.word	0x0
    37  	movl	16(ap), r0
    38  	movl	12(ap), r1
    39  	movl	8(ap), r2
    40  	movl	4(ap), r3
    41  	mnegl	r0, r5
    42  	addl2	$3, r0
    43  	ashl	$-2, r0, r0	C unroll loop count
    44  	bicl2	$-4, r5		C mask out low 2 bits
    45  	movaq	(r5)[r5], r5	C 9x
    46  	jmp	L(top)[r5]
    47  
    48  L(top):	movl	(r2)+, r4
    49  	sbwc	(r1)+, r4
    50  	movl	r4, (r3)+
    51  	movl	(r2)+, r4
    52  	sbwc	(r1)+, r4
    53  	movl	r4, (r3)+
    54  	movl	(r2)+, r4
    55  	sbwc	(r1)+, r4
    56  	movl	r4, (r3)+
    57  	movl	(r2)+, r4
    58  	sbwc	(r1)+, r4
    59  	movl	r4, (r3)+
    60  	sobgtr	r0, L(top)
    61  
    62  	adwc	r0, r0
    63  	ret
    64  EPILOGUE()