view Lib/fftw-3.2.1/simd/altivec.c @ 1:e86e9c111b29

Updates stuff that potentially fixes the memory leak and also makes it work on Windows and Linux (Need to test). Still have to fix fftw include for linux in Jucer.

/*
 * Copyright (c) 2003, 2007-8 Matteo Frigo
 * Copyright (c) 2003, 2007-8 Massachusetts Institute of Technology
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */


#include "ifftw.h"
#include "simd.h"

#if HAVE_ALTIVEC

#if HAVE_SYS_SYSCTL_H
#include <sys/sysctl.h>
#endif

#if HAVE_SYS_SYSCTL_H && HAVE_SYSCTL && defined(CTL_HW) && defined(HW_VECTORUNIT)
/* code for darwin */
static int really_have_altivec(void)
{
     int mib[2], altivecp;
     size_t len;
     mib[0] = CTL_HW;
     mib[1] = HW_VECTORUNIT;
     len = sizeof(altivecp);
     sysctl(mib, 2, &altivecp, &len, NULL, 0);
     return altivecp;
} 
#else /* HAVE_SYS_SYSCTL_H etc. */

#include <signal.h>
#include <setjmp.h>

static jmp_buf jb;

static void sighandler(int x)
{
     longjmp(jb, 1);
}

static int really_have_altivec(void)
{
     void (*oldsig)(int);
     oldsig = signal(SIGILL, sighandler);
     if (setjmp(jb)) {
	  signal(SIGILL, oldsig);
	  return 0;
     } else {
	  __asm__ __volatile__ (".long 0x10000484"); /* vor 0,0,0 */
	  signal(SIGILL, oldsig);
	  return 1;
     }
     return 0;
}
#endif

int RIGHT_CPU(void)
{
     static int init = 0, res;
     if (!init) {
	  res = really_have_altivec();
	  init = 1;
     }
     return res;
}
#endif