diff options
Diffstat (limited to 'cpudetect.c')
| -rw-r--r-- | cpudetect.c | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/cpudetect.c b/cpudetect.c index ffc56d8f74..ba5a0d0adc 100644 --- a/cpudetect.c +++ b/cpudetect.c @@ -429,6 +429,27 @@ static void check_os_katmai_support( void ) } #else /* ARCH_X86 */ +#ifdef SYS_DARWIN +#include <sys/sysctl.h> +#else +#include <signal.h> +#include <setjmp.h> + +static sigjmp_buf jmpbuf; +static volatile sig_atomic_t canjump = 0; + +static void sigill_handler (int sig) +{ + if (!canjump) { + signal (sig, SIG_DFL); + raise (sig); + } + + canjump = 0; + siglongjmp (jmpbuf, 1); +} +#endif + void GetCpuCaps( CpuCaps *caps) { caps->cpuType=0; @@ -440,5 +461,46 @@ void GetCpuCaps( CpuCaps *caps) caps->hasSSE=0; caps->hasSSE2=0; caps->isX86=0; + caps->hasAltiVec = 0; +#ifdef HAVE_ALTIVEC +#ifdef SYS_DARWIN +/* + rip-off from ffmpeg altivec detection code. + this code also appears on Apple's AltiVec pages. + */ + { + int sels[2] = {CTL_HW, HW_VECTORUNIT}; + int has_vu = 0; + size_t len = sizeof(has_vu); + int err; + + err = sysctl(sels, 2, &has_vu, &len, NULL, 0); + + if (err == 0) + if (has_vu != 0) + caps->hasAltiVec = 1; + mp_msg(MSGT_CPUDETECT,MSGL_INFO,"AltiVec %sfound\n", (caps->hasAltiVec ? "" : "not ")); + } +#else /* SYS_DARWIN */ +/* no Darwin, do it the brute-force way */ +/* this is borrowed from the libmpeg2 library */ + { + signal (SIGILL, sigill_handler); + if (sigsetjmp (jmpbuf, 1)) { + signal (SIGILL, SIG_DFL); + } else { + canjump = 1; + + asm volatile ("mtspr 256, %0\n\t" + "vand v0, v0, v0" + : + : "r" (-1)); + + signal (SIGILL, SIG_DFL); + caps->hasAltiVec = 1; + } + } +#endif /* SYS_DARWIN */ +#endif /* HAVE_ALTIVEC */ } #endif /* !ARCH_X86 */ |