Am Mittwoch, den 10.01.2018, 16:36 +0100 schrieb Gert Wollny: > This seems to satisfy the sb optimizer, i.e. no regressions in the > piglits compared to disabling sb for tesselation shaders with > barriers but enabling them in general. > ---
Actually, it seems this is not enough, at least for Tomb Raider which uses one tessellation control shader with a barrier. The optimizer reorders the LDS instructions around the barrier in a way that in the optimized version there are more reads before it than in the original byte code. The number of writes is the same though, and as far as I can tell from the TGSI, the values written to LDS before the barrier are not read back within the shader - which makes me wonder whether the barrier is actually necessary. Best, Gert _______________________________________________ mesa-dev mailing list [email protected] https://lists.freedesktop.org/mailman/listinfo/mesa-dev
