github.com/aergoio/aergo@v1.3.1/libtool/src/gmp-6.1.2/mpn/x86_64/bdiv_dbm1c.asm (about)

     1  dnl  x86_64 mpn_bdiv_dbm1.
     2  
     3  dnl  Copyright 2008, 2011, 2012 Free Software Foundation, Inc.
     4  
     5  dnl  This file is part of the GNU MP Library.
     6  dnl
     7  dnl  The GNU MP Library is free software; you can redistribute it and/or modify
     8  dnl  it under the terms of either:
     9  dnl
    10  dnl    * the GNU Lesser General Public License as published by the Free
    11  dnl      Software Foundation; either version 3 of the License, or (at your
    12  dnl      option) any later version.
    13  dnl
    14  dnl  or
    15  dnl
    16  dnl    * the GNU General Public License as published by the Free Software
    17  dnl      Foundation; either version 2 of the License, or (at your option) any
    18  dnl      later version.
    19  dnl
    20  dnl  or both in parallel, as here.
    21  dnl
    22  dnl  The GNU MP Library is distributed in the hope that it will be useful, but
    23  dnl  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
    24  dnl  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    25  dnl  for more details.
    26  dnl
    27  dnl  You should have received copies of the GNU General Public License and the
    28  dnl  GNU Lesser General Public License along with the GNU MP Library.  If not,
    29  dnl  see https://www.gnu.org/licenses/.
    30  
    31  include(`../config.m4')
    32  
    33  C	     cycles/limb
    34  C AMD K8,K9	 2.25
    35  C AMD K10	 2.25
    36  C Intel P4	12.5
    37  C Intel core2	 4
    38  C Intel NHM	 3.75
    39  C Intel SBR	 3.6
    40  C Intel atom	20
    41  C VIA nano	 4
    42  
    43  C TODO
    44  C  * Optimise feed-in code.
    45  
    46  C INPUT PARAMETERS
    47  define(`qp',	  `%rdi')
    48  define(`up',	  `%rsi')
    49  define(`n_param', `%rdx')
    50  define(`bd',	  `%rcx')
    51  define(`cy',	  `%r8')
    52  
    53  define(`n',       `%r9')
    54  
    55  ABI_SUPPORT(DOS64)
    56  ABI_SUPPORT(STD64)
    57  
    58  ASM_START()
    59  	TEXT
    60  	ALIGN(16)
    61  PROLOGUE(mpn_bdiv_dbm1c)
    62  	FUNC_ENTRY(4)
    63  IFDOS(`	mov	56(%rsp), %r8	')
    64  	mov	(up), %rax
    65  	mov	n_param, n
    66  	mov	R32(n_param), R32(%r11)
    67  	mul	bd
    68  	lea	(up,n,8), up
    69  	lea	(qp,n,8), qp
    70  	neg	n
    71  	and	$3, R32(%r11)
    72  	jz	L(lo0)
    73  	lea	-4(n,%r11), n
    74  	cmp	$2, R32(%r11)
    75  	jc	L(lo1)
    76  	jz	L(lo2)
    77  	jmp	L(lo3)
    78  
    79  	ALIGN(16)
    80  L(top):	mov	(up,n,8), %rax
    81  	mul	bd
    82  L(lo0):	sub	%rax, %r8
    83  	mov	%r8, (qp,n,8)
    84  	sbb	%rdx, %r8
    85  	mov	8(up,n,8), %rax
    86  	mul	bd
    87  L(lo3):	sub	%rax, %r8
    88  	mov	%r8, 8(qp,n,8)
    89  	sbb	%rdx, %r8
    90  	mov	16(up,n,8), %rax
    91  	mul	bd
    92  L(lo2):	sub	%rax, %r8
    93  	mov	%r8, 16(qp,n,8)
    94  	sbb	%rdx, %r8
    95  	mov	24(up,n,8), %rax
    96  	mul	bd
    97  L(lo1):	sub	%rax, %r8
    98  	mov	%r8, 24(qp,n,8)
    99  	sbb	%rdx, %r8
   100  	add	$4, n
   101  	jnz	L(top)
   102  
   103  	mov	%r8, %rax
   104  	FUNC_EXIT()
   105  	ret
   106  EPILOGUE()