cannam@95: /*
cannam@95:  * Copyright (c) 2003, 2007-11 Matteo Frigo
cannam@95:  * Copyright (c) 2003, 2007-11 Massachusetts Institute of Technology
cannam@95:  *
cannam@95:  * This program is free software; you can redistribute it and/or modify
cannam@95:  * it under the terms of the GNU General Public License as published by
cannam@95:  * the Free Software Foundation; either version 2 of the License, or
cannam@95:  * (at your option) any later version.
cannam@95:  *
cannam@95:  * This program is distributed in the hope that it will be useful,
cannam@95:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
cannam@95:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
cannam@95:  * GNU General Public License for more details.
cannam@95:  *
cannam@95:  * You should have received a copy of the GNU General Public License
cannam@95:  * along with this program; if not, write to the Free Software
cannam@95:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
cannam@95:  *
cannam@95:  */
cannam@95: 
cannam@95: 
cannam@95: #include "ifftw.h"
cannam@95: 
cannam@95: #if HAVE_ALTIVEC
cannam@95: 
cannam@95: #if HAVE_SYS_SYSCTL_H
cannam@95: #  include <sys/sysctl.h>
cannam@95: #endif
cannam@95: 
cannam@95: #if HAVE_SYS_SYSCTL_H && HAVE_SYSCTL && defined(CTL_HW) && defined(HW_VECTORUNIT)
cannam@95: /* code for darwin */
cannam@95: static int really_have_altivec(void)
cannam@95: {
cannam@95:      int mib[2], altivecp;
cannam@95:      size_t len;
cannam@95:      mib[0] = CTL_HW;
cannam@95:      mib[1] = HW_VECTORUNIT;
cannam@95:      len = sizeof(altivecp);
cannam@95:      sysctl(mib, 2, &altivecp, &len, NULL, 0);
cannam@95:      return altivecp;
cannam@95: } 
cannam@95: #else /* GNU/Linux and other non-Darwin systems (!HAVE_SYS_SYSCTL_H etc.) */
cannam@95: 
cannam@95: #include <signal.h>
cannam@95: #include <setjmp.h>
cannam@95: 
cannam@95: static jmp_buf jb;
cannam@95: 
cannam@95: static void sighandler(int x)
cannam@95: {
cannam@95:      longjmp(jb, 1);
cannam@95: }
cannam@95: 
cannam@95: static int really_have_altivec(void)
cannam@95: {
cannam@95:      void (*oldsig)(int);
cannam@95:      oldsig = signal(SIGILL, sighandler);
cannam@95:      if (setjmp(jb)) {
cannam@95: 	  signal(SIGILL, oldsig);
cannam@95: 	  return 0;
cannam@95:      } else {
cannam@95: 	  __asm__ __volatile__ (".long 0x10000484"); /* vor 0,0,0 */
cannam@95: 	  signal(SIGILL, oldsig);
cannam@95: 	  return 1;
cannam@95:      }
cannam@95:      return 0;
cannam@95: }
cannam@95: #endif
cannam@95: 
cannam@95: int X(have_simd_altivec)(void)
cannam@95: {
cannam@95:      static int init = 0, res;
cannam@95:      if (!init) {
cannam@95: 	  res = really_have_altivec();
cannam@95: 	  init = 1;
cannam@95:      }
cannam@95:      return res;
cannam@95: }
cannam@95: 
cannam@95: #endif