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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 * VSX SIMD implementation added 2015 Erik Lindahl.
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6 * Erik Lindahl places his modifications in the public domain.
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7 *
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8 * This program is free software; you can redistribute it and/or modify
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9 * it under the terms of the GNU General Public License as published by
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10 * the Free Software Foundation; either version 2 of the License, or
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11 * (at your option) any later version.
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12 *
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13 * This program is distributed in the hope that it will be useful,
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14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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16 * GNU General Public License for more details.
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17 *
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18 * You should have received a copy of the GNU General Public License
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19 * along with this program; if not, write to the Free Software
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20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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21 *
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22 */
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23
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24
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25 #include "ifftw.h"
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26
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27 #if HAVE_VSX
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28
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29 #if HAVE_SYS_SYSCTL_H
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30 # include <sys/sysctl.h>
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31 #endif
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32
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33 #include <signal.h>
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34 #include <setjmp.h>
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35
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36 static jmp_buf jb;
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37
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38 static void sighandler(int x)
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39 {
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40 longjmp(jb, 1);
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41 }
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42
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43 static int really_have_vsx(void)
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44 {
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45 void (*oldsig)(int);
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46 oldsig = signal(SIGILL, sighandler);
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47 if (setjmp(jb)) {
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48 signal(SIGILL, oldsig);
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49 return 0;
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50 } else {
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51 float mem[2];
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52 __asm__ __volatile__ ("stxsdx 0,0,%0" :: "r" (mem) : "memory" );
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53 signal(SIGILL, oldsig);
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54 return 1;
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55 }
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56 return 0;
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57 }
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58
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59 int X(have_simd_vsx)(void)
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60 {
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61 static int init = 0, res;
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62 if (!init) {
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63 res = really_have_vsx();
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64 init = 1;
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65 }
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66 return res;
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67 }
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68
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69 #endif
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