github.com/aergoio/aergo@v1.3.1/libtool/src/gmp-6.1.2/mpn/arm64/aorsmul_1.asm (about)

     1  dnl  ARM64 mpn_submul_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  changecom(@&*$)
    40  
    41  define(`rp', `x0')
    42  define(`up', `x1')
    43  define(`n',  `x2')
    44  define(`v0', `x3')
    45  
    46  ifdef(`OPERATION_addmul_1', `
    47    define(`ADDSUB',	adds)
    48    define(`ADDSUBC',	adcs)
    49    define(`COND',	`cc')
    50    define(`func',	mpn_addmul_1)')
    51  ifdef(`OPERATION_submul_1', `
    52    define(`ADDSUB',	subs)
    53    define(`ADDSUBC',	sbcs)
    54    define(`COND',	`cs')
    55    define(`func',	mpn_submul_1)')
    56  
    57  MULFUNC_PROLOGUE(mpn_addmul_1 mpn_submul_1)
    58  
    59  PROLOGUE(func)
    60  	mov	x15, #0
    61  
    62  	tbz	n, #0, L(1)
    63  
    64  	ldr	x4, [up],#8
    65  	mul	x8, x4, v0
    66  	umulh	x12, x4, v0
    67  	adds	x8, x8, x15
    68  	ldr	x4, [rp,#0]
    69  	ADDSUB	x8, x4, x8
    70  	csinc	x15, x12, x12, COND
    71  	str	x8, [rp],#8
    72  
    73  L(1):	tbz	n, #1, L(2)
    74  
    75  	ldp	x4, x5, [up],#16
    76  	mul	x8, x4, v0
    77  	umulh	x12, x4, v0
    78  	mul	x9, x5, v0
    79  	umulh	x13, x5, v0
    80  	adds	x8, x8, x15
    81  	adcs	x9, x9, x12
    82  	ldp	x4, x5, [rp,#0]
    83  	adc	x15, x13, xzr
    84  	sub	n, n, #1
    85  	ADDSUB	x8, x4, x8
    86  	ADDSUBC	x9, x5, x9
    87  	csinc	x15, x15, x15, COND
    88  	stp	x8, x9, [rp],#16
    89  
    90  L(2):	lsr	n, n, #2
    91  	cbz	n, L(end)
    92  
    93  L(top):	ldp	x4, x5, [up],#16
    94  	ldp	x6, x7, [up],#16
    95  	mul	x8, x4, v0
    96  	umulh	x12, x4, v0
    97  	mul	x9, x5, v0
    98  	umulh	x13, x5, v0
    99  	adds	x8, x8, x15
   100  	mul	x10, x6, v0
   101  	umulh	x14, x6, v0
   102  	adcs	x9, x9, x12
   103  	mul	x11, x7, v0
   104  	umulh	x15, x7, v0
   105  	adcs	x10, x10, x13
   106  	ldp	x4, x5, [rp,#0]
   107  	adcs	x11, x11, x14
   108  	ldp	x6, x7, [rp,#16]
   109  	adc	x15, x15, xzr
   110  	sub	n, n, #1
   111  	ADDSUB	x8, x4, x8
   112  	ADDSUBC	x9, x5, x9
   113  	ADDSUBC	x10, x6, x10
   114  	ADDSUBC	x11, x7, x11
   115  	stp	x8, x9, [rp],#16
   116  	csinc	x15, x15, x15, COND
   117  	stp	x10, x11, [rp],#16
   118  	cbnz	n, L(top)
   119  
   120  L(end):	mov	x0, x15
   121  	ret
   122  EPILOGUE()