diff options
Diffstat (limited to 'gmp-6.3.0/mpn/arm64/gcd_11.asm')
| -rw-r--r-- | gmp-6.3.0/mpn/arm64/gcd_11.asm | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/gmp-6.3.0/mpn/arm64/gcd_11.asm b/gmp-6.3.0/mpn/arm64/gcd_11.asm new file mode 100644 index 0000000..d8cc3e2 --- /dev/null +++ b/gmp-6.3.0/mpn/arm64/gcd_11.asm @@ -0,0 +1,70 @@ +dnl ARM v8a mpn_gcd_11. + +dnl Based on the K7 gcd_1.asm, by Kevin Ryde. Rehacked for ARM by Torbjorn +dnl Granlund. + +dnl Copyright 2000-2002, 2005, 2009, 2011-2013 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/. + +include(`../config.m4') + +changecom(blah) + +C cycles/bit (approx) +C Cortex-A35 ? +C Cortex-A53 ? +C Cortex-A55 ? +C Cortex-A57 ? +C Cortex-A72 ? +C Cortex-A73 ? +C Cortex-A75 ? +C Cortex-A76 ? +C Cortex-A77 ? +C Numbers measured with: speed -CD -s16-64 -t48 mpn_gcd_1 + +define(`u0', `x0') +define(`v0', `x1') + +ASM_START() + TEXT + ALIGN(16) +PROLOGUE(mpn_gcd_11) + subs x3, u0, v0 C 0 + b.eq L(end) C + + ALIGN(16) +L(top): rbit x12, x3 C 1,5 + clz x12, x12 C 2 + csneg x3, x3, x3, cs C v = abs(u-v), even 1 + csel u0, v0, u0, cs C u = min(u,v) 1 + lsr v0, x3, x12 C 3 + subs x3, u0, v0 C 4 + b.ne L(top) C + +L(end): ret +EPILOGUE() |