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/*
* 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_SSE
# if defined(__x86_64__) || defined(_M_X64) || defined(_M_AMD64)
int RIGHT_CPU(void)
{
return 1;
}
# else /* !x86_64 */
# include <signal.h>
# include <setjmp.h>
# include "x86-cpuid.h"
static jmp_buf jb;
static void sighandler(int x)
{
UNUSED(x);
longjmp(jb, 1);
}
static int sse_works(void)
{
void (*oldsig)(int);
oldsig = signal(SIGILL, sighandler);
if (setjmp(jb)) {
signal(SIGILL, oldsig);
return 0;
} else {
# ifdef _MSC_VER
_asm { xorps xmm0,xmm0 }
# else
/* asm volatile ("xorps %xmm0, %xmm0"); */
asm volatile (".byte 0x0f; .byte 0x57; .byte 0xc0");
# endif
signal(SIGILL, oldsig);
return 1;
}
}
int RIGHT_CPU(void)
{
static int init = 0, res;
extern void X(check_alignment_of_sse_pmpm)(void);
if (!init) {
res = !is_386()
&& has_cpuid()
&& (cpuid_edx(1) & (1 << 25))
&& sse_works();
init = 1;
X(check_alignment_of_sse_pmpm)();
}
return res;
}
# endif /* x86_64 */
#endif /* HAVE_SSE */
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