71 lines
2.5 KiB
C
71 lines
2.5 KiB
C
|
/*
|
||
|
|
* 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
|