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/*
* 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_NEON
#ifdef __linux__
#ifdef __aarch64__
/* HWCAP_ASIMD is defined in <asm/hwcap.h> but not included by <sys/auxv.h>.
Since all current AArch64 implementations have NEON/ASIMD it is probably
better to return 1 than include a header file which is not intended for
use by user programs. */
int X(have_simd_neon)(void)
{
return 1;
}
#else
#include <sys/auxv.h>
int X(have_simd_neon)(void)
{
static int cached = 2;
int ret;
/* This should be thread-safe in all reasonable circumstances. */
ret = cached;
if (ret == 2)
{
ret = !!(getauxval(AT_HWCAP) & HWCAP_ARM_NEON);
cached = ret;
}
return ret;
}
#endif
#else
#error Please implement a run-time test for NEON/ASIMD for your platform.
#endif
#endif
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