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dnl AMD K6-2 mpn_com -- mpn bitwise one's complement.
dnl Copyright 1999-2002 Free Software Foundation, Inc.
dnl This file is part of the GNU MP Library.
dnl
dnl The GNU MP Library is free software; you can redistribute it and/or modify
dnl it under the terms of either:
dnl
dnl * the GNU Lesser General Public License as published by the Free
dnl Software Foundation; either version 3 of the License, or (at your
dnl option) any later version.
dnl
dnl or
dnl
dnl * the GNU General Public License as published by the Free Software
dnl Foundation; either version 2 of the License, or (at your option) any
dnl later version.
dnl
dnl or both in parallel, as here.
dnl
dnl The GNU MP Library is distributed in the hope that it will be useful, but
dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
dnl for more details.
dnl
dnl You should have received copies of the GNU General Public License and the
dnl GNU Lesser General Public License along with the GNU MP Library. If not,
dnl see https://www.gnu.org/licenses/.
include(`../config.m4')
NAILS_SUPPORT(0-31)
C alignment dst/src, A=0mod8 N=4mod8
C A/A A/N N/A N/N
C K6-2 1.0 1.18 1.18 1.18 cycles/limb
C K6 1.5 1.85 1.75 1.85
C void mpn_com (mp_ptr dst, mp_srcptr src, mp_size_t size);
C
C Take the bitwise ones-complement of src,size and write it to dst,size.
defframe(PARAM_SIZE,12)
defframe(PARAM_SRC, 8)
defframe(PARAM_DST, 4)
TEXT
ALIGN(16)
PROLOGUE(mpn_com)
deflit(`FRAME',0)
movl PARAM_SIZE, %ecx
movl PARAM_SRC, %eax
movl PARAM_DST, %edx
shrl %ecx
jnz L(two_or_more)
movl (%eax), %eax
notl_or_xorl_GMP_NUMB_MASK( %eax)
movl %eax, (%edx)
ret
L(two_or_more):
pushl %ebx FRAME_pushl()
pcmpeqd %mm7, %mm7 C all ones
movl %ecx, %ebx
ifelse(GMP_NAIL_BITS,0,,
` psrld $GMP_NAIL_BITS, %mm7') C clear nails
ALIGN(8)
L(top):
C eax src
C ebx floor(size/2)
C ecx counter
C edx dst
C
C mm0 scratch
C mm7 mask
movq -8(%eax,%ecx,8), %mm0
pxor %mm7, %mm0
movq %mm0, -8(%edx,%ecx,8)
loop L(top)
jnc L(no_extra)
movl (%eax,%ebx,8), %eax
notl_or_xorl_GMP_NUMB_MASK( %eax)
movl %eax, (%edx,%ebx,8)
L(no_extra):
popl %ebx
emms_or_femms
ret
EPILOGUE()
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