Chris@42: /*
Chris@42:  * Copyright (c) 2003, 2007-14 Matteo Frigo
Chris@42:  * Copyright (c) 2003, 2007-14 Massachusetts Institute of Technology
Chris@42:  *
Chris@42:  * This program is free software; you can redistribute it and/or modify
Chris@42:  * it under the terms of the GNU General Public License as published by
Chris@42:  * the Free Software Foundation; either version 2 of the License, or
Chris@42:  * (at your option) any later version.
Chris@42:  *
Chris@42:  * This program is distributed in the hope that it will be useful,
Chris@42:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
Chris@42:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
Chris@42:  * GNU General Public License for more details.
Chris@42:  *
Chris@42:  * You should have received a copy of the GNU General Public License
Chris@42:  * along with this program; if not, write to the Free Software
Chris@42:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
Chris@42:  *
Chris@42:  */
Chris@42: 
Chris@42: 
Chris@42: #include "ifftw.h"
Chris@42: 
Chris@42: #if HAVE_AVX
Chris@42: 
Chris@42: #if defined(__x86_64__) || defined(_M_X64) || defined(_M_AMD64)
Chris@42: #    include "amd64-cpuid.h"
Chris@42: #else
Chris@42: #    include "x86-cpuid.h"
Chris@42: #endif
Chris@42: 
Chris@42: int X(have_simd_avx)(void)
Chris@42: {
Chris@42:      static int init = 0, res = 0;
Chris@42:      int max_stdfn, eax, ebx, ecx, edx;
Chris@42: 
Chris@42:      if (!init) {
Chris@42:           cpuid_all(0,0,&eax,&ebx,&ecx,&edx);
Chris@42:           max_stdfn = eax;
Chris@42:           if (max_stdfn >= 0x1) {
Chris@42:                /* have AVX and OSXSAVE? (implies XGETBV exists) */
Chris@42:                cpuid_all(0x1, 0, &eax, &ebx, &ecx, &edx);
Chris@42:                if ((ecx & 0x18000000) == 0x18000000) {
Chris@42:                     /* have OS support for XMM, YMM? */
Chris@42:                     res = ((xgetbv_eax(0) & 0x6) == 0x6);                    
Chris@42:                }
Chris@42:           }
Chris@42:           init = 1;
Chris@42:      }
Chris@42:      return res;
Chris@42: }
Chris@42: 
Chris@42: #endif
Chris@42: