io_uring: flip if handling after io_setup_async_rw
As recently done with with send/recv, flip the if after rw_verify_aread() in io_{read,write}() and tabulise left bits left. This removes mispredicted by a compiler jump on the success/fast path. Signed-off-by: NPavel Begunkov <asml.silence@gmail.com> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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