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1 /*
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2 * Copyright (c) 2003, 2007-11 Matteo Frigo
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3 * Copyright (c) 2003, 2007-11 Massachusetts Institute of Technology
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4 * Copyright (c) 2012-2013 Romain Dolbeau
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5 *
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6 * Permission is hereby granted, free of charge, to any person obtaining a copy
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7 * of this software and associated documentation files (the "Software"), to deal
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8 * in the Software without restriction, including without limitation the rights
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9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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10 * copies of the Software, and to permit persons to whom the Software is
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11 * furnished to do so, subject to the following conditions:
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12 *
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13 * The above copyright notice and this permission notice shall be included in
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14 * all copies or substantial portions of the Software.
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15 *
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16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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22 * THE SOFTWARE.
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23 *
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24 */
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25
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26 #include "kernel/ifftw.h"
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27
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28 #if HAVE_AVX512
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29
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30 #if defined(__x86_64__) || defined(_M_X64) || defined(_M_AMD64)
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31
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32 #include "amd64-cpuid.h"
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33
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34 int X(have_simd_avx512)(void)
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35 {
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36 static int init = 0, res;
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37 int max_stdfn, eax, ebx, ecx, edx;
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38
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39 /* NOTE: this code is a total guess. I don't have an avx512
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40 machine available. The code contributed by Erik Lindahl would
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41 crash on a machine without XGETBV, so I had to guess a fix. */
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42 if (!init) {
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43 cpuid_all(0,0,&eax,&ebx,&ecx,&edx);
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44 max_stdfn = eax;
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45 if (max_stdfn >= 0x1) {
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46 /* have OSXSAVE? (implies XGETBV exists) */
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47 cpuid_all(0x1, 0, &eax, &ebx, &ecx, &edx);
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48 if ((ecx & 0x08000000) == 0x08000000) {
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49 /* have AVX512? */
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50 cpuid_all(7,0,&eax,&ebx,&ecx,&edx);
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51 if (ebx & (1 << 16)) {
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52 /* have OS support for XMM, YMM, ZMM */
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53 int zmm_ymm_xmm = (7 << 5) | (1 << 2) | (1 << 1);
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54 res = ((xgetbv_eax(0) & zmm_ymm_xmm) == zmm_ymm_xmm);
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55 }
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56 }
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57 }
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58 init = 1;
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59 }
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60
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61 return res;
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62 }
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63
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64 #else /* 32-bit code */
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65
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66 #error "Avx512 is 64 bits only"
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67
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68 #endif
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69
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70 #endif
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