77 lines
1.9 KiB
C
77 lines
1.9 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_NEON
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/* check for an environment where signals are known to work */
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#if defined(unix) || defined(linux)
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# include <signal.h>
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# include <setjmp.h>
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static jmp_buf jb;
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static void sighandler(int x)
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{
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UNUSED(x);
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longjmp(jb, 1);
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}
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static int really_have_neon(void)
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{
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void (*oldsig)(int);
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oldsig = signal(SIGILL, sighandler);
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if (setjmp(jb)) {
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signal(SIGILL, oldsig);
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return 0;
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} else {
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/* paranoia: encode the instruction in binary because the
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assembler may not recognize it without -mfpu=neon */
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/*asm volatile ("vand q0, q0, q0");*/
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asm volatile (".long 0xf2000150");
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signal(SIGILL, oldsig);
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return 1;
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}
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}
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int X(have_simd_neon)(void)
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{
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static int init = 0, res;
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if (!init) {
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res = really_have_neon();
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init = 1;
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}
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return res;
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}
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#else
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/* don't know how to autodetect NEON; assume it is present */
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int X(have_simd_neon)(void)
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{
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return 1;
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}
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#endif
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#endif
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