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dnl AMD K6-2 mpn_com_n -- mpn bitwise one's complement.
dnl Copyright 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
dnl
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
dnl modify it under the terms of the GNU Lesser General Public License as
dnl published by the Free Software Foundation; either version 3 of the
dnl License, or (at your option) any later version.
dnl
dnl The GNU MP Library is distributed in the hope that it will be useful,
dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
dnl Lesser General Public License for more details.
dnl
dnl You should have received a copy of the GNU Lesser General Public License
dnl along with the GNU MP Library. If not, see http://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_n (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_n)
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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