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