2 * This file is part of FFmpeg.
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 * @file check_altivec.c
22 * Checks for AltiVec presence.
26 #undef _POSIX_C_SOURCE
27 #include <sys/sysctl.h>
29 #include <sys/param.h>
30 #include <sys/sysctl.h>
31 #include <machine/cpu.h>
33 #include <exec/exec.h>
34 #include <interfaces/exec.h>
35 #include <proto/exec.h>
36 #endif /* __APPLE__ */
39 * This function MAY rely on signal() or fork() in order to make sure AltiVec
47 extern struct ExecIFace *IExec;
49 IExec->GetCPUInfoTags(GCIT_VectorUnit, &result, TAG_DONE);
50 if (result == VECTORTYPE_ALTIVEC) return 1;
52 #elif defined(__APPLE__) || defined(__OpenBSD__)
54 int sels[2] = {CTL_MACHDEP, CPU_ALTIVEC};
56 int sels[2] = {CTL_HW, HW_VECTORUNIT};
59 size_t len = sizeof(has_vu);
62 err = sysctl(sels, 2, &has_vu, &len, NULL, 0);
64 if (err == 0) return has_vu != 0;
66 #elif defined(RUNTIME_CPUDETECT)
68 // Support of mfspr PVR emulation added in Linux 2.6.17.
69 asm volatile("mfspr %0, 287" : "=r" (proc_ver));
71 if (proc_ver & 0x8000 ||
73 proc_ver == 0x0039 || proc_ver == 0x003c ||
74 proc_ver == 0x0044 || proc_ver == 0x0045 ||
79 // Since we were compiled for AltiVec, just assume we have it
80 // until someone comes up with a proper way (not involving signal hacks).
82 #endif /* __AMIGAOS4__ */