github.com/aergoio/aergo@v1.3.1/libtool/src/gmp-6.1.2/mpn/arm64/mul_1.asm (about)

     1  dnl  ARM64 mpn_mul_1
     2  
     3  dnl  Contributed to the GNU project by Torbjörn Granlund.
     4  
     5  dnl  Copyright 2013 Free Software Foundation, Inc.
     6  
     7  dnl  This file is part of the GNU MP Library.
     8  dnl
     9  dnl  The GNU MP Library is free software; you can redistribute it and/or modify
    10  dnl  it under the terms of either:
    11  dnl
    12  dnl    * the GNU Lesser General Public License as published by the Free
    13  dnl      Software Foundation; either version 3 of the License, or (at your
    14  dnl      option) any later version.
    15  dnl
    16  dnl  or
    17  dnl
    18  dnl    * the GNU General Public License as published by the Free Software
    19  dnl      Foundation; either version 2 of the License, or (at your option) any
    20  dnl      later version.
    21  dnl
    22  dnl  or both in parallel, as here.
    23  dnl
    24  dnl  The GNU MP Library is distributed in the hope that it will be useful, but
    25  dnl  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
    26  dnl  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    27  dnl  for more details.
    28  dnl
    29  dnl  You should have received copies of the GNU General Public License and the
    30  dnl  GNU Lesser General Public License along with the GNU MP Library.  If not,
    31  dnl  see https://www.gnu.org/licenses/.
    32  
    33  include(`../config.m4')
    34  
    35  C	     cycles/limb
    36  C Cortex-A53	 ?
    37  C Cortex-A57	 ?
    38  
    39  define(`rp', `x0')
    40  define(`up', `x1')
    41  define(`n',  `x2')
    42  define(`v0', `x3')
    43  
    44  ASM_START()
    45  PROLOGUE(mpn_mul_1)
    46  	ldr	x12, [up], #8
    47  	and	x6, n, #3
    48  	and	n, n, #-4
    49  	cbz	x6, L(fi0)
    50  	cmp	x6, #2
    51  	b.cc	L(fi1)
    52  	b.eq	L(fi2)
    53  
    54  L(fi3):	mul	x8, x12, v0
    55  	umulh	x13, x12, v0
    56  	cmn	xzr, xzr
    57  	b	L(L3)
    58  L(fi2):	mul	x7, x12, v0
    59  	umulh	x5, x12, v0
    60  	cmn	xzr, xzr
    61  	b	L(L2)
    62  L(fi0):	mul	x9, x12, v0
    63  	umulh	x5, x12, v0
    64  	sub	n, n, #4
    65  	cmn	xzr, xzr
    66  	b	L(L0)
    67  L(fi1):	mul	x10, x12, v0
    68  	umulh	x13, x12, v0
    69  	cmn	xzr, xzr
    70  	cbz	n, L(end)
    71  
    72  L(top):	sub	n, n, #4
    73  	ldr	x12, [up], #8
    74  	mul	x6, x12, v0
    75  	umulh	x5, x12, v0
    76  	str	x10, [rp], #8
    77  	adcs	x9, x6, x13
    78  L(L0):	ldr	x12, [up], #8
    79  	mul	x6, x12, v0
    80  	umulh	x13, x12, v0
    81  	str	x9, [rp] ,#8
    82  	adcs	x8, x6, x5
    83  L(L3):	ldr	x12, [up], #8
    84  	mul	x6, x12, v0
    85  	umulh	x5, x12, v0
    86  	str	x8, [rp], #8
    87  	adcs	x7, x6, x13
    88  L(L2):	ldr	x12, [up], #8
    89  	mul	x6, x12, v0
    90  	umulh	x13, x12, v0
    91  	str	x7, [rp], #8
    92  	adcs	x10, x6, x5
    93  	cbnz	n, L(top)
    94  
    95  L(end):	str	x10, [rp]
    96  	adc	x0, x13, xzr
    97  	ret
    98  EPILOGUE()