Chris@42: /*
Chris@42:  * Copyright (c) 2003, 2007-14 Matteo Frigo
Chris@42:  * Copyright (c) 2003, 2007-14 Massachusetts Institute of Technology
Chris@42:  *
Chris@42:  * VSX SIMD implementation added 2015 Erik Lindahl.
Chris@42:  * Erik Lindahl places his modifications in the public domain.
Chris@42:  *
Chris@42:  * This program is free software; you can redistribute it and/or modify
Chris@42:  * it under the terms of the GNU General Public License as published by
Chris@42:  * the Free Software Foundation; either version 2 of the License, or
Chris@42:  * (at your option) any later version.
Chris@42:  *
Chris@42:  * This program is distributed in the hope that it will be useful,
Chris@42:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
Chris@42:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
Chris@42:  * GNU General Public License for more details.
Chris@42:  *
Chris@42:  * You should have received a copy of the GNU General Public License
Chris@42:  * along with this program; if not, write to the Free Software
Chris@42:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
Chris@42:  *
Chris@42:  */
Chris@42: 
Chris@42: 
Chris@42: #include "ifftw.h"
Chris@42: 
Chris@42: #if HAVE_VSX
Chris@42: 
Chris@42: #if HAVE_SYS_SYSCTL_H
Chris@42: #  include <sys/sysctl.h>
Chris@42: #endif
Chris@42: 
Chris@42: #include <signal.h>
Chris@42: #include <setjmp.h>
Chris@42: 
Chris@42: static jmp_buf jb;
Chris@42: 
Chris@42: static void sighandler(int x)
Chris@42: {
Chris@42:      longjmp(jb, 1);
Chris@42: }
Chris@42: 
Chris@42: static int really_have_vsx(void)
Chris@42: {
Chris@42:      void (*oldsig)(int);
Chris@42:      oldsig = signal(SIGILL, sighandler);
Chris@42:      if (setjmp(jb)) {
Chris@42: 	  signal(SIGILL, oldsig);
Chris@42: 	  return 0;
Chris@42:      } else {
Chris@42:           float mem[2];
Chris@42:           __asm__ __volatile__ ("stxsdx 0,0,%0" :: "r" (mem) : "memory" );
Chris@42: 	  signal(SIGILL, oldsig);
Chris@42: 	  return 1;
Chris@42:      }
Chris@42:      return 0;
Chris@42: }
Chris@42: 
Chris@42: int X(have_simd_vsx)(void)
Chris@42: {
Chris@42:      static int init = 0, res;
Chris@42:      if (!init) {
Chris@42: 	  res = really_have_vsx();
Chris@42: 	  init = 1;
Chris@42:      }
Chris@42:      return res;
Chris@42: }
Chris@42: 
Chris@42: #endif