github.com/aergoio/aergo@v1.3.1/libtool/src/gmp-6.1.2/mpn/x86/k6/mmx/com.asm (about)

     1  dnl  AMD K6-2 mpn_com -- mpn bitwise one's complement.
     2  
     3  dnl  Copyright 1999-2002 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  NAILS_SUPPORT(0-31)
    34  
    35  
    36  C    alignment dst/src, A=0mod8 N=4mod8
    37  C       A/A   A/N   N/A   N/N
    38  C K6-2  1.0   1.18  1.18  1.18  cycles/limb
    39  C K6    1.5   1.85  1.75  1.85
    40  
    41  
    42  C void mpn_com (mp_ptr dst, mp_srcptr src, mp_size_t size);
    43  C
    44  C Take the bitwise ones-complement of src,size and write it to dst,size.
    45  
    46  defframe(PARAM_SIZE,12)
    47  defframe(PARAM_SRC, 8)
    48  defframe(PARAM_DST, 4)
    49  
    50  	TEXT
    51  	ALIGN(16)
    52  PROLOGUE(mpn_com)
    53  deflit(`FRAME',0)
    54  
    55  	movl	PARAM_SIZE, %ecx
    56  	movl	PARAM_SRC, %eax
    57  	movl	PARAM_DST, %edx
    58  	shrl	%ecx
    59  	jnz	L(two_or_more)
    60  
    61  	movl	(%eax), %eax
    62  	notl_or_xorl_GMP_NUMB_MASK(	%eax)
    63  	movl	%eax, (%edx)
    64  	ret
    65  
    66  
    67  L(two_or_more):
    68  	pushl	%ebx	FRAME_pushl()
    69  	pcmpeqd	%mm7, %mm7		C all ones
    70  
    71  	movl	%ecx, %ebx
    72  ifelse(GMP_NAIL_BITS,0,,
    73  `	psrld	$GMP_NAIL_BITS, %mm7')	C clear nails
    74  
    75  
    76  
    77  	ALIGN(8)
    78  L(top):
    79  	C eax	src
    80  	C ebx	floor(size/2)
    81  	C ecx	counter
    82  	C edx	dst
    83  	C
    84  	C mm0	scratch
    85  	C mm7	mask
    86  
    87  	movq	-8(%eax,%ecx,8), %mm0
    88  	pxor	%mm7, %mm0
    89  	movq	%mm0, -8(%edx,%ecx,8)
    90  	loop	L(top)
    91  
    92  
    93  	jnc	L(no_extra)
    94  	movl	(%eax,%ebx,8), %eax
    95  	notl_or_xorl_GMP_NUMB_MASK(	%eax)
    96  	movl	%eax, (%edx,%ebx,8)
    97  L(no_extra):
    98  
    99  	popl	%ebx
   100  	emms_or_femms
   101  	ret
   102  
   103  EPILOGUE()