| 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() |
