furnace/extern/fftw/simd-support/altivec.c

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/*
* Copyright (c) 2003, 2007-14 Matteo Frigo
* Copyright (c) 2003, 2007-14 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#include "kernel/ifftw.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 /* GNU/Linux and other non-Darwin systems (!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 X(have_simd_altivec)(void)
{
static int init = 0, res;
if (!init) {
res = really_have_altivec();
init = 1;
}
return res;
}
#endif