github.com/aergoio/aergo@v1.3.1/libtool/src/gmp-6.1.2/mpn/x86/cnd_aors_n.asm (about)

     1  dnl  X86 mpn_cnd_add_n, mpn_cnd_sub_n
     2  
     3  dnl  Copyright 2013 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 P5				 ?
    35  C P6 model 0-8,10-12		 ?
    36  C P6 model 9   (Banias)		 ?
    37  C P6 model 13  (Dothan)		 5.4
    38  C P4 model 0-1 (Willamette)	 ?
    39  C P4 model 2   (Northwood)	14.5
    40  C P4 model 3-4 (Prescott)	21
    41  C Intel atom			11
    42  C AMD K6			 ?
    43  C AMD K7			 3.4
    44  C AMD K8			 ?
    45  
    46  
    47  define(`rp',  `%edi')
    48  define(`up',  `%esi')
    49  define(`vp',  `%ebp')
    50  define(`n',   `%ecx')
    51  define(`cnd', `20(%esp)')
    52  define(`cy',  `%edx')
    53  
    54  ifdef(`OPERATION_cnd_add_n', `
    55  	define(ADDSUB,	      add)
    56  	define(ADCSBB,	      adc)
    57  	define(func,	      mpn_cnd_add_n)')
    58  ifdef(`OPERATION_cnd_sub_n', `
    59  	define(ADDSUB,	      sub)
    60  	define(ADCSBB,	      sbb)
    61  	define(func,	      mpn_cnd_sub_n)')
    62  
    63  MULFUNC_PROLOGUE(mpn_cnd_add_n mpn_cnd_sub_n)
    64  
    65  ASM_START()
    66  	TEXT
    67  	ALIGN(16)
    68  PROLOGUE(func)
    69  	add	$-16, %esp
    70  	mov	%ebp, (%esp)
    71  	mov	%ebx, 4(%esp)
    72  	mov	%esi, 8(%esp)
    73  	mov	%edi, 12(%esp)
    74  
    75  	C make cnd into a full mask
    76  	mov	cnd, %eax
    77  	neg	%eax
    78  	sbb	%eax, %eax
    79  	mov	%eax, cnd
    80  
    81  	C load parameters into registers
    82  	mov	24(%esp), rp
    83  	mov	28(%esp), up
    84  	mov	32(%esp), vp
    85  	mov	36(%esp), n
    86  
    87  	mov	(vp), %eax
    88  	mov	(up), %ebx
    89  
    90  	C put operand pointers just beyond their last limb
    91  	lea	(vp,n,4), vp
    92  	lea	(up,n,4), up
    93  	lea	-4(rp,n,4), rp
    94  	neg	n
    95  
    96  	and	cnd, %eax
    97  	ADDSUB	%eax, %ebx
    98  	sbb	cy, cy
    99  	inc	n
   100  	je	L(end)
   101  
   102  	ALIGN(16)
   103  L(top):	mov	(vp,n,4), %eax
   104  	and	cnd, %eax
   105  	mov	%ebx, (rp,n,4)
   106  	mov	(up,n,4), %ebx
   107  	add	cy, cy
   108  	ADCSBB	%eax, %ebx
   109  	sbb	cy, cy
   110  	inc	n
   111  	jne	L(top)
   112  
   113  L(end):	mov	%ebx, (rp)
   114  	xor	%eax, %eax
   115  	sub	cy, %eax
   116  
   117  	mov	(%esp), %ebp
   118  	mov	4(%esp), %ebx
   119  	mov	8(%esp), %esi
   120  	mov	12(%esp), %edi
   121  	add	$16, %esp
   122  	ret
   123  EPILOGUE()
   124  ASM_END()