source/libs/gmp/gmp-src/mpn/x86/k6/mmx/com.asm

   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()