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