furnace/extern/fftw/simd-support/avx512.c

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/*
* Copyright (c) 2003, 2007-11 Matteo Frigo
* Copyright (c) 2003, 2007-11 Massachusetts Institute of Technology
* Copyright (c) 2012-2013 Romain Dolbeau
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
*/
#include "kernel/ifftw.h"
#if HAVE_AVX512
#if defined(__x86_64__) || defined(_M_X64) || defined(_M_AMD64)
#include "amd64-cpuid.h"
int X(have_simd_avx512)(void)
{
static int init = 0, res;
int max_stdfn, eax, ebx, ecx, edx;
/* NOTE: this code is a total guess. I don't have an avx512
machine available. The code contributed by Erik Lindahl would
crash on a machine without XGETBV, so I had to guess a fix. */
if (!init) {
cpuid_all(0,0,&eax,&ebx,&ecx,&edx);
max_stdfn = eax;
if (max_stdfn >= 0x1) {
/* have OSXSAVE? (implies XGETBV exists) */
cpuid_all(0x1, 0, &eax, &ebx, &ecx, &edx);
if ((ecx & 0x08000000) == 0x08000000) {
/* have AVX512? */
cpuid_all(7,0,&eax,&ebx,&ecx,&edx);
if (ebx & (1 << 16)) {
/* have OS support for XMM, YMM, ZMM */
int zmm_ymm_xmm = (7 << 5) | (1 << 2) | (1 << 1);
res = ((xgetbv_eax(0) & zmm_ymm_xmm) == zmm_ymm_xmm);
}
}
}
init = 1;
}
return res;
}
#else /* 32-bit code */
#error "Avx512 is 64 bits only"
#endif
#endif