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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 "ifftw.h"
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23
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24 #if HAVE_ALTIVEC
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25
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26 #if HAVE_SYS_SYSCTL_H
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27 # include <sys/sysctl.h>
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28 #endif
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29
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30 #if HAVE_SYS_SYSCTL_H && HAVE_SYSCTL && defined(CTL_HW) && defined(HW_VECTORUNIT)
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31 /* code for darwin */
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32 static int really_have_altivec(void)
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33 {
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34 int mib[2], altivecp;
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35 size_t len;
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36 mib[0] = CTL_HW;
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37 mib[1] = HW_VECTORUNIT;
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38 len = sizeof(altivecp);
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39 sysctl(mib, 2, &altivecp, &len, NULL, 0);
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40 return altivecp;
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41 }
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42 #else /* GNU/Linux and other non-Darwin systems (!HAVE_SYS_SYSCTL_H etc.) */
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43
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44 #include <signal.h>
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45 #include <setjmp.h>
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46
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47 static jmp_buf jb;
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48
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49 static void sighandler(int x)
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50 {
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51 longjmp(jb, 1);
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52 }
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53
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54 static int really_have_altivec(void)
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55 {
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56 void (*oldsig)(int);
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57 oldsig = signal(SIGILL, sighandler);
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58 if (setjmp(jb)) {
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59 signal(SIGILL, oldsig);
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60 return 0;
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61 } else {
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62 __asm__ __volatile__ (".long 0x10000484"); /* vor 0,0,0 */
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63 signal(SIGILL, oldsig);
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64 return 1;
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65 }
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66 return 0;
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67 }
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68 #endif
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69
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70 int X(have_simd_altivec)(void)
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71 {
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72 static int init = 0, res;
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73 if (!init) {
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74 res = really_have_altivec();
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75 init = 1;
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76 }
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77 return res;
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78 }
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79
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80 #endif
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