---
configure | 2 ++
libavutil/x86/intmath.h | 9 +++++++++
2 files changed, 11 insertions(+)
diff --git a/configure b/configure
index 6710f85..610be92 100755
--- a/configure
+++ b/configure
@@ -1738,6 +1738,7 @@ BUILTIN_LIST="
machine_rw_barrier
MemoryBarrier
mm_empty
+ parity
rdtsc
sarestart
sync_val_compare_and_swap
@@ -5242,6 +5243,7 @@ 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)
diff --git a/libavutil/x86/intmath.h b/libavutil/x86/intmath.h
index 611ef88..9c36bf2 100644
--- a/libavutil/x86/intmath.h
+++ b/libavutil/x86/intmath.h
@@ -75,6 +75,15 @@ static av_always_inline av_const int ff_ctzll_x86(long long
v)
#endif /* __POPCNT__ */
+static av_always_inline av_const int ff_parity(uint32_t v)
+{
+#if HAVE_PARITY
+ return __builtin_parity(v);
+#else
+ return av_popcount(v) & 1;
+#endif
+}
+
#if defined(__BMI2__)
#if AV_GCC_VERSION_AT_LEAST(5,1)
--
2.6.4
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