Fix all the recent problems Justin had run into with the AC3 parser,
[libav.git] / libavcodec / ppc / check_altivec.c
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1/*
2 * This file is part of FFmpeg.
3 *
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.
8 *
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.
13 *
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
17 */
18
19
20/**
21 * @file check_altivec.c
22 * Checks for AltiVec presence.
23 */
24
25#ifdef __APPLE__
7f0d242b 26#undef _POSIX_C_SOURCE
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27#include <sys/sysctl.h>
28#elif __AMIGAOS4__
29#include <exec/exec.h>
30#include <interfaces/exec.h>
31#include <proto/exec.h>
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32#endif /* __APPLE__ */
33
34/**
35 * This function MAY rely on signal() or fork() in order to make sure altivec
36 * is present
37 */
38
39int has_altivec(void)
40{
41#ifdef __AMIGAOS4__
42 ULONG result = 0;
43 extern struct ExecIFace *IExec;
44
45 IExec->GetCPUInfoTags(GCIT_VectorUnit, &result, TAG_DONE);
46 if (result == VECTORTYPE_ALTIVEC) return 1;
47 return 0;
48#elif __APPLE__
49 int sels[2] = {CTL_HW, HW_VECTORUNIT};
50 int has_vu = 0;
51 size_t len = sizeof(has_vu);
52 int err;
53
54 err = sysctl(sels, 2, &has_vu, &len, NULL, 0);
55
ccd425e7 56 if (err == 0) return has_vu != 0;
89523bee 57 return 0;
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58#elif defined(RUNTIME_CPUDETECT)
59 int proc_ver;
60 // support of mfspr PVR emulation added in Linux 2.6.17
61 asm volatile("mfspr %0, 287" : "=r" (proc_ver));
62 proc_ver >>= 16;
63 if (proc_ver & 0x8000 ||
64 proc_ver == 0x000c ||
65 proc_ver == 0x0039 || proc_ver == 0x003c ||
66 proc_ver == 0x0044 || proc_ver == 0x0045 ||
67 proc_ver == 0x0070)
68 return 1;
69 return 0;
89523bee 70#else
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71 // since we were compiled for altivec, just assume we have it
72 // until someone comes up with a proper way (not involving signal hacks).
73 return 1;
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74#endif /* __AMIGAOS4__ */
75}
76