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| author | Reimar Döffinger <Reimar.Doeffinger@gmx.de> | 2008-01-19 19:27:39 +0000 |
|---|---|---|
| committer | Reimar Döffinger <Reimar.Doeffinger@gmx.de> | 2008-01-19 19:27:39 +0000 |
| commit | b8659d94b76c9b90c0aff3c5c01bfd2be6324e93 (patch) | |
| tree | d14c7e46bec92ed97818dbdfc90d501ea6983af3 /libavcodec | |
| parent | a33b2c7e396ad36b9f47dcf9cec4b20d6a852653 (diff) | |
Add mfspr-based AltiVec detection code.
Currently not enabled in FFmpeg, because it crashes if the OS does not
emulate mfspr.
Originally committed as revision 11569 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec')
| -rw-r--r-- | libavcodec/ppc/check_altivec.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/libavcodec/ppc/check_altivec.c b/libavcodec/ppc/check_altivec.c index b3778cab31..cf55b9a1d5 100644 --- a/libavcodec/ppc/check_altivec.c +++ b/libavcodec/ppc/check_altivec.c @@ -54,6 +54,18 @@ int has_altivec(void) if (err == 0) return (has_vu != 0); return 0; +#elif defined(RUNTIME_CPUDETECT) + int proc_ver; + // support of mfspr PVR emulation added in Linux 2.6.17 + asm volatile("mfspr %0, 287" : "=r" (proc_ver)); + proc_ver >>= 16; + if (proc_ver & 0x8000 || + proc_ver == 0x000c || + proc_ver == 0x0039 || proc_ver == 0x003c || + proc_ver == 0x0044 || proc_ver == 0x0045 || + proc_ver == 0x0070) + return 1; + return 0; #else // since we were compiled for altivec, just assume we have it // until someone comes up with a proper way (not involving signal hacks). |