Kenneth Graunke
1d63af0f2c
If a buffer has no usage history, we don't have any read only cache invalidates to do. If we've written it with the CPU, we don't need to flush the render cache. The only bit remaining is the CS stall from iris_flush_bits_for_history. We can just skip the PIPE_CONTROL in this case. This is pretty common - an app creates a buffer, fills it with data, and then binds it for some purpose. Cuts 36% of the flushes in Manhattan 3.0 on Kabylake GT2.
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