1dnl PowerPC-64 mpn_gcd_11. 2 3dnl Copyright 2000-2002, 2005, 2009, 2011-2013 Free Software Foundation, Inc. 4 5dnl This file is part of the GNU MP Library. 6dnl 7dnl The GNU MP Library is free software; you can redistribute it and/or modify 8dnl it under the terms of either: 9dnl 10dnl * the GNU Lesser General Public License as published by the Free 11dnl Software Foundation; either version 3 of the License, or (at your 12dnl option) any later version. 13dnl 14dnl or 15dnl 16dnl * the GNU General Public License as published by the Free Software 17dnl Foundation; either version 2 of the License, or (at your option) any 18dnl later version. 19dnl 20dnl or both in parallel, as here. 21dnl 22dnl The GNU MP Library is distributed in the hope that it will be useful, but 23dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 24dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 25dnl for more details. 26dnl 27dnl You should have received copies of the GNU General Public License and the 28dnl GNU Lesser General Public License along with the GNU MP Library. If not, 29dnl see https://www.gnu.org/licenses/. 30 31include(`../config.m4') 32 33C cycles/bit (approx) 34C POWER3/PPC630 - 35C POWER4/PPC970 - 36C POWER5 - 37C POWER6 - 38C POWER7 7.6 obsolete 39C POWER8 ? 40C POWER9 ? 41C Numbers measured with: speed -CD -s16-64 -t48 mpn_gcd_1 42 43C INPUT PARAMETERS 44define(`u0', `r3') 45define(`v0', `r4') 46 47define(`cnt', `r9')dnl 48 49ASM_START() 50PROLOGUE(mpn_gcd_11) 51 li r12, 63 52 b L(odd) 53 54 ALIGN(16) 55L(top): and r8, r11, r10 C isolate lsb 56 cntlzd cnt, r8 57 isel v0, u0, v0, 29 C v = min(u,v) 58 isel u0, r10, r11, 29 C u = |u - v| 59 subf cnt, cnt, r12 C cnt = 63-cnt 60 srd u0, u0, cnt 61L(odd): cmpld cr7, v0, u0 62 subf r10, u0, v0 C r10 = v - u 63 subf r11, v0, u0 C r11 = u - v 64 bne cr7, L(top) 65 66L(end): blr 67EPILOGUE() 68