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read-only mirror of https://gitlab.freedesktop.org/mesa/mesa
c784af5ca0
Before a7xx, ldg/stg.a use an offset in units of their type size while on a7xx and later, the offset is always in bytes. Currently, @load/store_global_ir3 take their offset in dwords (32-bits). This has a few downsides: offsets need an extra shl during codegen on a7xx and addressing sub-dword-aligned addresses is only possible by doing 64-bit math on the base address. Improve the situation by always using a byte offset for @load/store_global_ir3 and adding the offset_shift index to support type units pre-a7xx. While we're at it, add the base index as well to support all ldg/stg.g features in @load/store_global_ir3. Supporting these renewed intrinsics consists of two parts: - ir3_nir_lower_io_offsets legalizes the offset_shift on a6xx: for ldg.a/stg.a, the offset has to be in units of the type size so extra shifts are inserted to accomplish this if necessary. On a7xx, offsets are always in bytes so nothing needs to be done. - The intrinsics are emitted as ldg/stg if the offset is a small enough constant and as ldg.a/stg.a otherwise. a6xx supports an extra shift for ldg.a/stg.a that only applies to the GPR offset (not the immediate base); NIR is pattern matched at this point to extract this if possible. All users of @load/store_global_ir3 are updated to generate the offset in units of bytes. ir3_nir_analyze_ubo_ranges is updated to take the new offset_shift into account. Totals from 2029 (1.15% of 176266) affected shaders: MaxWaves: 26728 -> 26660 (-0.25%); split: +0.01%, -0.26% Instrs: 1314089 -> 1278603 (-2.70%); split: -2.72%, +0.02% CodeSize: 2739108 -> 2633236 (-3.87%); split: -3.87%, +0.01% NOPs: 197537 -> 200843 (+1.67%); split: -1.62%, +3.30% MOVs: 43771 -> 44025 (+0.58%); split: -1.11%, +1.69% Full: 31849 -> 31948 (+0.31%); split: -0.03%, +0.34% (ss): 37965 -> 42027 (+10.70%); split: -3.47%, +14.17% (sy): 13752 -> 13566 (-1.35%); split: -4.04%, +2.68% (ss)-stall: 154238 -> 170353 (+10.45%); split: -1.72%, +12.16% (sy)-stall: 804442 -> 806518 (+0.26%); split: -4.65%, +4.91% Preamble Instrs: 326728 -> 293488 (-10.17%) Cat0: 217926 -> 220947 (+1.39%); split: -1.58%, +2.96% Cat1: 50182 -> 50446 (+0.53%); split: -0.97%, +1.49% Cat2: 460987 -> 452101 (-1.93%); split: -2.26%, +0.33% Cat3: 390696 -> 361271 (-7.53%) Cat7: 39148 -> 38688 (-1.18%); split: -1.24%, +0.06% Signed-off-by: Job Noorman <jnoorman@igalia.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/41342> |
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`Mesa <https://mesa3d.org>`_ - The 3D Graphics Library ====================================================== Source ------ This repository lives at https://gitlab.freedesktop.org/mesa/mesa. Other repositories are likely forks, and code found there is not supported. Build & install --------------- You can find more information in our documentation (`docs/install.rst <https://docs.mesa3d.org/install.html>`_), but the recommended way is to use Meson (`docs/meson.rst <https://docs.mesa3d.org/meson.html>`_): .. code-block:: sh $ meson setup build $ ninja -C build/ $ sudo ninja -C build/ install Support ------- Many Mesa devs hang on IRC; if you're not sure which channel is appropriate, you should ask your question on `OFTC's #dri-devel <irc://irc.oftc.net/dri-devel>`_, someone will redirect you if necessary. Remember that not everyone is in the same timezone as you, so it might take a while before someone qualified sees your question. To figure out who you're talking to, or which nick to ping for your question, check out `Who's Who on IRC <https://dri.freedesktop.org/wiki/WhosWho/>`_. The next best option is to ask your question in an email to the mailing lists: `mesa-dev\@lists.freedesktop.org <https://lists.freedesktop.org/mailman/listinfo/mesa-dev>`_ Bug reports ----------- If you think something isn't working properly, please file a bug report (`docs/bugs.rst <https://docs.mesa3d.org/bugs.html>`_). Contributing ------------ Contributions are welcome, and step-by-step instructions can be found in our documentation (`docs/submittingpatches.rst <https://docs.mesa3d.org/submittingpatches.html>`_). Note that Mesa uses gitlab for patches submission, review and discussions.