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lavu: add ff_parity()

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This commit is contained in:
Clément Bœsch 2016-01-03 20:14:37 +01:00
parent d64fe951c2
commit 2ce29d1765
2 changed files with 14 additions and 0 deletions
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2
configure vendored
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@ -1736,6 +1736,7 @@ BUILTIN_LIST="
machine_rw_barrier
MemoryBarrier
mm_empty
parity
rdtsc
sarestart
sync_val_compare_and_swap
@ -5241,6 +5242,7 @@ check_builtin sarestart signal.h "SA_RESTART"
check_builtin sync_val_compare_and_swap "" "int *ptr; int oldval, newval; __sync_val_compare_and_swap(ptr, oldval, newval)"
check_builtin gmtime_r time.h "time_t *time; struct tm *tm; gmtime_r(time, tm)"
check_builtin localtime_r time.h "time_t *time; struct tm *tm; localtime_r(time, tm)"
check_builtin parity "" "__builtin_parity(123)"
case "$custom_allocator" in
jemalloc)

12
libavutil/intmath.h
View File

@ -153,6 +153,18 @@ static av_always_inline av_const unsigned ff_clz_c(unsigned x)
}
#endif
#ifndef ff_parity
#define ff_parity ff_parity_c
static av_always_inline av_const int ff_parity_c(uint32_t v)
{
#if HAVE_PARITY
return __builtin_parity(v);
#else
return av_popcount(v) & 1;
#endif
}
#endif
/**
* @}
*/