mirror of
https://github.com/tildearrow/furnace.git
synced 2024-12-05 02:37:26 +00:00
68 lines
2.1 KiB
C
68 lines
2.1 KiB
C
/*
|
|
* Copyright (c) 2003, 2007-14 Matteo Frigo
|
|
* Copyright (c) 2003, 2007-14 Massachusetts Institute of Technology
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*
|
|
*/
|
|
|
|
|
|
#include "kernel/ifftw.h"
|
|
|
|
#if HAVE_AVX2
|
|
|
|
#if defined(__x86_64__) || defined(_M_X64) || defined(_M_AMD64)
|
|
# include "amd64-cpuid.h"
|
|
#else
|
|
# include "x86-cpuid.h"
|
|
#endif
|
|
|
|
int X(have_simd_avx2_128)(void)
|
|
{
|
|
static int init = 0, res;
|
|
int max_stdfn, eax, ebx, ecx, edx;
|
|
|
|
if (!init) {
|
|
cpuid_all(0,0,&eax,&ebx,&ecx,&edx);
|
|
max_stdfn = eax;
|
|
if (max_stdfn >= 0x1) {
|
|
/* have AVX and OSXSAVE? (implies XGETBV exists) */
|
|
cpuid_all(0x1, 0, &eax, &ebx, &ecx, &edx);
|
|
if ((ecx & 0x18000000) == 0x18000000) {
|
|
/* have AVX2? */
|
|
cpuid_all(7,0,&eax,&ebx,&ecx,&edx);
|
|
if (ebx & (1 << 5)) {
|
|
/* have OS support for XMM, YMM? */
|
|
res = ((xgetbv_eax(0) & 0x6) == 0x6);
|
|
}
|
|
}
|
|
}
|
|
init = 1;
|
|
}
|
|
return res;
|
|
}
|
|
|
|
int X(have_simd_avx2)(void)
|
|
{
|
|
/*
|
|
* For now 256-bit AVX2 support is identical to 128-bit.
|
|
* This might change in the future if AMD released AVX2-capable
|
|
* chips that work better with the 128-bit flavor, but since AMD
|
|
* might actually change it to implement 256-bit AVX2 efficiently
|
|
* by then we don't want to disable it before we know.
|
|
*/
|
|
return X(have_simd_avx2_128)();
|
|
}
|
|
#endif
|