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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
This commit is contained in:
Reimar Döffinger 2008-01-19 19:27:39 +00:00
parent a33b2c7e39
commit b8659d94b7
1 changed files with 12 additions and 0 deletions
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12
libavcodec/ppc/check_altivec.c
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@ -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).