mirror of
https://github.com/tildearrow/furnace.git
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81 lines
1.9 KiB
C
81 lines
1.9 KiB
C
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/*
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* Copyright (c) 2003, 2007-14 Matteo Frigo
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* Copyright (c) 2003, 2007-14 Massachusetts Institute of Technology
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#include "kernel/ifftw.h"
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#if HAVE_ALTIVEC
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#if HAVE_SYS_SYSCTL_H
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# include <sys/sysctl.h>
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#endif
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#if HAVE_SYS_SYSCTL_H && HAVE_SYSCTL && defined(CTL_HW) && defined(HW_VECTORUNIT)
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/* code for darwin */
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static int really_have_altivec(void)
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{
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int mib[2], altivecp;
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size_t len;
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mib[0] = CTL_HW;
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mib[1] = HW_VECTORUNIT;
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len = sizeof(altivecp);
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sysctl(mib, 2, &altivecp, &len, NULL, 0);
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return altivecp;
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}
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#else /* GNU/Linux and other non-Darwin systems (!HAVE_SYS_SYSCTL_H etc.) */
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#include <signal.h>
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#include <setjmp.h>
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static jmp_buf jb;
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static void sighandler(int x)
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{
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longjmp(jb, 1);
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}
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static int really_have_altivec(void)
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{
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void (*oldsig)(int);
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oldsig = signal(SIGILL, sighandler);
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if (setjmp(jb)) {
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signal(SIGILL, oldsig);
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return 0;
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} else {
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__asm__ __volatile__ (".long 0x10000484"); /* vor 0,0,0 */
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signal(SIGILL, oldsig);
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return 1;
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}
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return 0;
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}
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#endif
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int X(have_simd_altivec)(void)
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{
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static int init = 0, res;
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if (!init) {
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res = really_have_altivec();
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init = 1;
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}
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return res;
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}
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#endif
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