OpenXM_contrib/gmp/mpn/x86/p6/diveby3.asm - diff

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version 1.1.1.1, 2000/09/09 14:12:44

version 1.1.1.2, 2003/08/25 16:06:29

Line 1

dnl Intel P6 mpn_divexact_by3 -- mpn division by 3, expecting no remainder.

dnl

dnl P6: 8.5 cycles/limb

dnl

dnl This file is part of the GNU MP Library.

dnl

Line 22 dnl License along with the GNU MP Library; see the fi

Line 19 dnl License along with the GNU MP Library; see the fi

dnl not, write to the Free Software Foundation, Inc., 59 Temple Place -

dnl Suite 330, Boston, MA 02111-1307, USA.

include(`../config.m4')

dnl The P5 code runs well on P6, in fact better than anything else found so

dnl far. An imul is 4 cycles, meaning the two cmp/sbbl pairs on the

dnl dependent path are taking 4.5 cycles.

dnl

dnl The destination cache line prefetching is unnecessary on P6, but

dnl removing it is a 2 cycle slowdown (approx), so it must be inducing

dnl something good in the out of order execution.

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 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')