diff options
Diffstat (limited to 'gmp/mpn/x86/pentium4/copyi.asm')
| -rw-r--r-- | gmp/mpn/x86/pentium4/copyi.asm | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/gmp/mpn/x86/pentium4/copyi.asm b/gmp/mpn/x86/pentium4/copyi.asm new file mode 100644 index 0000000000..b6148879fa --- /dev/null +++ b/gmp/mpn/x86/pentium4/copyi.asm @@ -0,0 +1,93 @@ +dnl Pentium-4 mpn_copyi -- copy limb vector, incrementing. + +dnl Copyright 1999-2001 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/. + + +dnl The rep/movsl is very slow for small blocks on pentium4. Its startup +dnl time seems to be about 110 cycles. It then copies at a rate of one +dnl limb per cycle. We therefore fall back to an open-coded 2 c/l copying +dnl loop for smaller sizes. + +dnl Ultimately, we may want to use 64-bit movd or 128-bit movdqu in some +dnl nifty unrolled arrangement. Clearly, that could reach much higher +dnl speeds, at least for large blocks. + +include(`../config.m4') + + +defframe(PARAM_SIZE, 12) +defframe(PARAM_SRC, 8) +defframe(PARAM_DST, 4) + + TEXT + ALIGN(8) + +PROLOGUE(mpn_copyi) +deflit(`FRAME',0) + + movl PARAM_SIZE, %ecx + cmpl $150, %ecx + jg L(replmovs) + + movl PARAM_SRC, %eax + movl PARAM_DST, %edx + movl %ebx, PARAM_SIZE + testl %ecx, %ecx + jz L(end) + +L(loop): + movl (%eax), %ebx + leal 4(%eax), %eax + addl $-1, %ecx + movl %ebx, (%edx) + leal 4(%edx), %edx + + jnz L(loop) + +L(end): + movl PARAM_SIZE, %ebx + ret + +L(replmovs): + cld C better safe than sorry, see mpn/x86/README + + movl %esi, %eax + movl PARAM_SRC, %esi + movl %edi, %edx + movl PARAM_DST, %edi + + rep + movsl + + movl %eax, %esi + movl %edx, %edi + + ret + +EPILOGUE() |