Chris@10: /*
Chris@10:  * Copyright (c) 2003, 2007-11 Matteo Frigo
Chris@10:  * Copyright (c) 2003, 2007-11 Massachusetts Institute of Technology
Chris@10:  *
Chris@10:  * This program is free software; you can redistribute it and/or modify
Chris@10:  * it under the terms of the GNU General Public License as published by
Chris@10:  * the Free Software Foundation; either version 2 of the License, or
Chris@10:  * (at your option) any later version.
Chris@10:  *
Chris@10:  * This program is distributed in the hope that it will be useful,
Chris@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
Chris@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
Chris@10:  * GNU General Public License for more details.
Chris@10:  *
Chris@10:  * You should have received a copy of the GNU General Public License
Chris@10:  * along with this program; if not, write to the Free Software
Chris@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
Chris@10:  *
Chris@10:  */
Chris@10: 
Chris@10: 
Chris@10: #include "ifftw.h"
Chris@10: 
Chris@10: #if HAVE_ALTIVEC
Chris@10: 
Chris@10: #if HAVE_SYS_SYSCTL_H
Chris@10: #  include <sys/sysctl.h>
Chris@10: #endif
Chris@10: 
Chris@10: #if HAVE_SYS_SYSCTL_H && HAVE_SYSCTL && defined(CTL_HW) && defined(HW_VECTORUNIT)
Chris@10: /* code for darwin */
Chris@10: static int really_have_altivec(void)
Chris@10: {
Chris@10:      int mib[2], altivecp;
Chris@10:      size_t len;
Chris@10:      mib[0] = CTL_HW;
Chris@10:      mib[1] = HW_VECTORUNIT;
Chris@10:      len = sizeof(altivecp);
Chris@10:      sysctl(mib, 2, &altivecp, &len, NULL, 0);
Chris@10:      return altivecp;
Chris@10: } 
Chris@10: #else /* GNU/Linux and other non-Darwin systems (!HAVE_SYS_SYSCTL_H etc.) */
Chris@10: 
Chris@10: #include <signal.h>
Chris@10: #include <setjmp.h>
Chris@10: 
Chris@10: static jmp_buf jb;
Chris@10: 
Chris@10: static void sighandler(int x)
Chris@10: {
Chris@10:      longjmp(jb, 1);
Chris@10: }
Chris@10: 
Chris@10: static int really_have_altivec(void)
Chris@10: {
Chris@10:      void (*oldsig)(int);
Chris@10:      oldsig = signal(SIGILL, sighandler);
Chris@10:      if (setjmp(jb)) {
Chris@10: 	  signal(SIGILL, oldsig);
Chris@10: 	  return 0;
Chris@10:      } else {
Chris@10: 	  __asm__ __volatile__ (".long 0x10000484"); /* vor 0,0,0 */
Chris@10: 	  signal(SIGILL, oldsig);
Chris@10: 	  return 1;
Chris@10:      }
Chris@10:      return 0;
Chris@10: }
Chris@10: #endif
Chris@10: 
Chris@10: int X(have_simd_altivec)(void)
Chris@10: {
Chris@10:      static int init = 0, res;
Chris@10:      if (!init) {
Chris@10: 	  res = really_have_altivec();
Chris@10: 	  init = 1;
Chris@10:      }
Chris@10:      return res;
Chris@10: }
Chris@10: 
Chris@10: #endif