matoro
8a75ba0a7f
This one is rather tricky, but changing the initialization of current_val should give this the same effect. Based on ffmpeg's change here: https://ffmpeg.org/pipermail/ffmpeg-devel/2014-October/164556.html Quoting from them: > The second reason is __atomic_compare_exchange_n(), and how it differs from > __sync_val_compare_and_swap(). > While the latter returns *ptr as it was before the operation, the former > doesn't and instead copies *ptr to oldval if the result of the > comparison is false. This means that returning oldval will match the old behavoir > without having to change the wrapper. > A disassemble example from libavutil/buffer.o however hints that the > __atomic function may be slower because of it writting oldval.
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