Paul Berry <stereotype...@gmail.com> writes: > Gen7 adds mask bits to the message header for a URB write which allow > the write to apply only to certain channels. We don't use this > functionality, so to ensure that the entire write always occurs, we > emit an OR instruction to set the mask bits. > > With the advent of geometry shaders, URB writes won't just happen at > the end of a thread; they will happen in mid-thread too. Thus, we can > no longer rely on channel 0 being enabled, so we need to emit the OR > instruction in WE_all mode to ensure that it is executed.
Reviewed-by: Eric Anholt <e...@anholt.net>
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