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The overhead does seem to matter when you have a high enough # of draw calls that effect few bins/pixels, because these writes would happen unconditionally (ie. not part of a state-group). Possibly we could keep these if we moved them into a state-group so the register writes would be no-ops on bins with no geometry. OTOH I usually end up adding in a WFI when using them scratch reg values to track down a crash. (So add a WFI to mitigate the annoyance of needing to use a debug build to get scratch regs to locate the position of a crash/hang in the cmdstream.) Signed-off-by: Rob Clark <robdclark@chromium.org> Reviewed-by: Kristian H. Kristensen <hoegsberg@google.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3435>
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