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1 /*
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2 * Copyright (c) 2003, 2007-14 Matteo Frigo
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3 * Copyright (c) 2003, 2007-14 Massachusetts Institute of Technology
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4 *
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5 * This program is free software; you can redistribute it and/or modify
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6 * it under the terms of the GNU General Public License as published by
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7 * the Free Software Foundation; either version 2 of the License, or
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8 * (at your option) any later version.
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9 *
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10 * This program is distributed in the hope that it will be useful,
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11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 * GNU General Public License for more details.
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14 *
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15 * You should have received a copy of the GNU General Public License
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16 * along with this program; if not, write to the Free Software
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17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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18 *
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19 */
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20
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21
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22 #include "kernel/ifftw.h"
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23
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24 #if HAVE_NEON
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25
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26 /* check for an environment where signals are known to work */
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27 #if defined(unix) || defined(linux)
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28 # include <signal.h>
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29 # include <setjmp.h>
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30
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31 static jmp_buf jb;
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32
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33 static void sighandler(int x)
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34 {
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35 UNUSED(x);
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36 longjmp(jb, 1);
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37 }
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38
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39 static int really_have_neon(void)
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40 {
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41 void (*oldsig)(int);
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42 oldsig = signal(SIGILL, sighandler);
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43 if (setjmp(jb)) {
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44 signal(SIGILL, oldsig);
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45 return 0;
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46 } else {
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47 /* paranoia: encode the instruction in binary because the
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48 assembler may not recognize it without -mfpu=neon */
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49 /*asm volatile ("vand q0, q0, q0");*/
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50 asm volatile (".long 0xf2000150");
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51 signal(SIGILL, oldsig);
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52 return 1;
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53 }
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54 }
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55
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56 int X(have_simd_neon)(void)
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57 {
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58 static int init = 0, res;
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59
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60 if (!init) {
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61 res = really_have_neon();
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62 init = 1;
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63 }
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64 return res;
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65 }
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66
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67
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68 #else
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69 /* don't know how to autodetect NEON; assume it is present */
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70 int X(have_simd_neon)(void)
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71 {
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72 return 1;
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73 }
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74 #endif
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75
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76 #endif
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