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dnl x86 mpn_gcd_11 optimised for processors with fast BSF.
dnl Based on the K7 gcd_1.asm, by Kevin Ryde. Rehacked by Torbjorn Granlund.
dnl Copyright 2000-2002, 2005, 2009, 2011, 2012, 2015 Free Software
dnl 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')
C cycles/bit (approx)
C AMD K7 7.80
C AMD K8,K9 7.79
C AMD K10 4.08
C AMD bd1 ?
C AMD bobcat 7.82
C Intel P4-2 14.9
C Intel P4-3/4 14.0
C Intel P6/13 5.09
C Intel core2 4.22
C Intel NHM 5.00
C Intel SBR 5.00
C Intel atom 17.1
C VIA nano ?
C Numbers measured with: speed -CD -s16-32 -t16 mpn_gcd_1
define(`u0', `%eax')
define(`v0', `%edx')
ASM_START()
TEXT
ALIGN(16)
PROLOGUE(mpn_gcd_11)
push %edi
push %esi
mov 12(%esp), %eax
mov 16(%esp), %edx
jmp L(odd)
ALIGN(16) C K10 BD C2 NHM SBR
L(top): cmovc( %esi, %eax) C u = |v - u| 0,3 0,3 0,6 0,5 0,5
cmovc( %edi, %edx) C v = min(u,v) 0,3 0,3 2,8 1,7 1,7
shr %cl, %eax C 1,7 1,6 2,8 2,8 2,8
L(odd): mov %edx, %esi C 1 1 4 3 3
sub %eax, %esi C 2 2 5 4 4
bsf %esi, %ecx C 3 3 6 5 5
mov %eax, %edi C 2 2 3 3 4
sub %edx, %eax C 2 2 4 3 4
jnz L(top) C
L(end): mov %edx, %eax
pop %esi
pop %edi
ret
EPILOGUE()
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