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We get optimal ldvary pipelining by doing the following: 1) Carefully merge a paired ldvary into the previous instruction when possible. 2) When the above succeeds, flag the ldvary as scheduled immediately so we can merge one of its children into the current instruction. 3) When scheduling ldvary sequences, only pick up instructions that are part of the sequence to avoid picking up something that prevents successful pipelining. This patch skips 3) assuming some hurt shaders in exchange for better scheduling flexibility during ldvary sequences. Besides eliminating most of the code dedicated to special handling ldvary sequences, this also usually allows us to produce better code by merging instructions that are unrelated to ldvary sequences into the ldvary sequences, which is particularly effective to fill up the gaps produced when scheduling the first and last ldvary sequences as well as the gaps produced by flat and noperspective varyings sequences that don't have both mul and add instructions. Notice that there are some hurt shaders, because some times the extra scheduler flexibility can lead to picking up instructions that will break a sequence without compensating for that, typically an ldunif that prevents us from doing the fixup for a follow-up ldvary. We will try to correct some of these cases with the next patch. total instructions in shared programs: 13786037 -> 13760415 (-0.19%) instructions in affected programs: 3201387 -> 3175765 (-0.80%) helped: 16155 HURT: 4146 Instructions are helped. total max-temps in shared programs: 2324834 -> 2322991 (-0.08%) max-temps in affected programs: 22160 -> 20317 (-8.32%) helped: 1340 HURT: 103 Max-temps are helped. total sfu-stalls in shared programs: 30685 -> 31827 (3.72%) sfu-stalls in affected programs: 782 -> 1924 (146.04%) helped: 253 HURT: 1416 Inconclusive result. total inst-and-stalls in shared programs: 13816722 -> 13792242 (-0.18%) inst-and-stalls in affected programs: 3171642 -> 3147162 (-0.77%) helped: 15331 HURT: 4179 Inst-and-stalls are helped. Reviewed-by: Alejandro Piñeiro <apinheiro@igalia.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/9471> |
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| vulkan | ||
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| meson.build | ||