annotate src/fftw-3.3.5/simd-support/avx-128-fma.c @ 148:b4bfdf10c4b3

Update Win64 capnp builds to v0.6

/*
 * Copyright (c) 2003, 2007-14 Matteo Frigo
 * Copyright (c) 2003, 2007-14 Massachusetts Institute of Technology
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */


#include "ifftw.h"

#if HAVE_AVX_128_FMA

#if defined(__x86_64__) || defined(_M_X64) || defined(_M_AMD64)
#    include "amd64-cpuid.h"
#else
#    include "x86-cpuid.h"
#endif

int X(have_simd_avx_128_fma)(void)
{
       static int init = 0, res = 0;
       int eax,ebx,ecx,edx;

       if (!init)
       {
	 /* Check if this is an AMD CPU */
	 cpuid_all(0,0,&eax,&ebx,&ecx,&edx);

	 /* 0x68747541: "Auth"  , 0x444d4163: "enti"  , 0x69746e65: "cAMD" */
	 if (ebx==0x68747541 && ecx==0x444d4163 && edx==0x69746e65)
	 {
	   /* OK, this is an AMD CPU. Check if we support FMA4 */
	   cpuid_all(0x80000001,0,&eax,&ebx,&ecx,&edx);
	   if(ecx & (1<<16))
	     {
	       res = 1;
	     }
	 }
	 init = 1;
       }
       return res;
}

#endif