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 libavcodec/ppc/check_altivec.c
22 * Checks for AltiVec presence.
26 #undef _POSIX_C_SOURCE
27 #include <sys/sysctl.h>
28 #elif defined(__OpenBSD__)
29 #include <sys/param.h>
30 #include <sys/sysctl.h>
31 #include <machine/cpu.h>
32 #elif defined(__AMIGAOS4__)
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 CONFIG_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__ */