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dnl ARM v6t2 mpn_gcd_11.
dnl Copyright 2000-2002, 2005, 2009, 2011, 2012, 2019 Free Software Foundation,
dnl 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 StrongARM -
C XScale -
C Cortex-A5 5.2
C Cortex-A7 5.04
C Cortex-A8 3.59
C Cortex-A9 9.5
C Cortex-A15 3.2
C Cortex-A17 5.25
C Cortex-A53 3.57
define(`u0', `r0')
define(`v0', `r1')
ASM_START()
TEXT
ALIGN(64)
PROLOGUE(mpn_gcd_11)
subs r3, u0, v0 C 0
beq L(end) C
ALIGN(16)
L(top): rbit r12, r3 C 1,5
clz r12, r12 C 2
rsbcc r3, r3, #0 C v = abs(u-v), even 1
movcs u0, v0 C u = min(u,v) 1
lsr v0, r3, r12 C 3
subs r3, u0, v0 C 4
bne L(top) C
L(end): bx lr
EPILOGUE()
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