cannam@127: /*
cannam@127:  * Copyright (c) 2003, 2007-14 Matteo Frigo
cannam@127:  * Copyright (c) 2003, 2007-14 Massachusetts Institute of Technology
cannam@127:  *
cannam@127:  * This program is free software; you can redistribute it and/or modify
cannam@127:  * it under the terms of the GNU General Public License as published by
cannam@127:  * the Free Software Foundation; either version 2 of the License, or
cannam@127:  * (at your option) any later version.
cannam@127:  *
cannam@127:  * This program is distributed in the hope that it will be useful,
cannam@127:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
cannam@127:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
cannam@127:  * GNU General Public License for more details.
cannam@127:  *
cannam@127:  * You should have received a copy of the GNU General Public License
cannam@127:  * along with this program; if not, write to the Free Software
cannam@127:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
cannam@127:  *
cannam@127:  */
cannam@127: 
cannam@127: 
cannam@127: #include "ifftw.h"
cannam@127: 
cannam@127: #if HAVE_AVX2
cannam@127: 
cannam@127: #if defined(__x86_64__) || defined(_M_X64) || defined(_M_AMD64)
cannam@127: #    include "amd64-cpuid.h"
cannam@127: #else
cannam@127: #    include "x86-cpuid.h"
cannam@127: #endif
cannam@127: 
cannam@127: int X(have_simd_avx2_128)(void)
cannam@127: {
cannam@127:     static int init = 0, res;
cannam@127:     int max_stdfn, eax, ebx, ecx, edx;
cannam@127:     
cannam@127:     if (!init) {
cannam@127:          cpuid_all(0,0,&eax,&ebx,&ecx,&edx);
cannam@127:          max_stdfn = eax;
cannam@127:          if (max_stdfn >= 0x1) {
cannam@127:               /* have AVX and OSXSAVE? (implies XGETBV exists) */
cannam@127:               cpuid_all(0x1, 0, &eax, &ebx, &ecx, &edx);
cannam@127:               if ((ecx & 0x18000000) == 0x18000000) {              
cannam@127:                    /* have AVX2? */
cannam@127:                    cpuid_all(7,0,&eax,&ebx,&ecx,&edx);
cannam@127:                    if (ebx & (1 << 5)) {
cannam@127:                         /* have OS support for XMM, YMM? */
cannam@127:                         res = ((xgetbv_eax(0) & 0x6) == 0x6);
cannam@127:                    }
cannam@127:               }
cannam@127:         }
cannam@127:         init = 1;
cannam@127:     }
cannam@127:     return res;
cannam@127: }
cannam@127: 
cannam@127: int X(have_simd_avx2)(void)
cannam@127: {
cannam@127:   /*
cannam@127:    * For now 256-bit AVX2 support is identical to 128-bit.
cannam@127:    * This might change in the future if AMD released AVX2-capable
cannam@127:    * chips that work better with the 128-bit flavor, but since AMD
cannam@127:    * might actually change it to implement 256-bit AVX2 efficiently
cannam@127:    * by then we don't want to disable it before we know.
cannam@127:    */
cannam@127:   return X(have_simd_avx2_128)();
cannam@127: }
cannam@127: #endif