38 lines
1.5 KiB
NASM
38 lines
1.5 KiB
NASM
|
dnl Intel P6 mpn_divexact_by3 -- mpn division by 3, expecting no remainder.
|
||
|
|
|
||
|
|
dnl Copyright 2000, 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 2.1 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
|
||
|
|
dnl License along with the GNU MP Library; see the file COPYING.LIB. If
|
||
|
|
dnl not, write to the Free Software Foundation, Inc., 51 Franklin Street,
|
||
|
|
dnl Fifth Floor, Boston, MA 02110-1301, USA.
|
||
|
|
|
||
|
|
include(`../config.m4')
|
||
|
|
|
||
|
|
|
||
|
|
C P6: 8.5 cycles/limb
|
||
|
|
|
||
|
|
|
||
|
|
C The P5 code runs well on P6, in fact better than anything else found so
|
||
|
|
C far. An imul is 4 cycles, meaning the two cmp/sbbl pairs on the dependent
|
||
|
|
C path are taking 4.5 cycles.
|
||
|
|
C
|
||
|
|
C The destination cache line prefetching is unnecessary on P6, but removing
|
||
|
|
C it is a 2 cycle slowdown (approx), so it must be inducing something good
|
||
|
|
C in the out of order execution.
|
||
|
|
|
||
|
|
MULFUNC_PROLOGUE(mpn_divexact_by3c)
|
||
|
|
include_mpn(`x86/pentium/diveby3.asm')
|