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73572abc2a
Add a NIR instrinsic that represent a memory barrier in SPIR-V /
Vulkan Memory Model, with extra attributes that describe the barrier:
- Ordering: whether is an Acquire or Release;
- "Cache control": availability ("ensure this gets written in the memory")
and visibility ("ensure my cache is up to date when I'm reading");
- Variable modes: which memory types this barrier applies to;
- Scope: how far this barrier applies.
Note that unlike in SPIR-V, the "Storage Semantics" and the "Memory
Semantics" are split into two different attributes so we can use
variable modes for the former.
NIR passes that took barriers in consideration were also changed
- nir_opt_copy_prop_vars: clean up the values for the mode of an
ACQUIRE barrier. Copy propagation effect is to "pull up a load" (by
not performing it), which is what ACQUIRE restricts.
- nir_opt_dead_write_vars and nir_opt_combine_writes: clean up the
pending writes for the modes of an RELEASE barrier. Dead writes
effect is to "push down a store", which is what RELEASE restricts.
- nir_opt_access: treat the ACQUIRE and RELEASE as a full barrier for
the modes. This is conservative, but since this is a GL-specific
pass, doesn't make a difference for now.
v2: Fix the scoped barrier handling in copy propagation. (Jason)
Add scoped barrier handling to nir_opt_access and
nir_opt_combine_writes. (Rhys)
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
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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.html <https://mesa3d.org/install.html>`_), but the recommended way is to use Meson (`docs/meson.html <https://mesa3d.org/meson.html>`_): .. code-block:: sh $ mkdir build $ cd build $ meson .. $ sudo ninja install Support ------- Many Mesa devs hang on IRC; if you're not sure which channel is appropriate, you should ask your question on `Freenode's #dri-devel <irc://chat.freenode.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.html <https://mesa3d.org/bugs.html>`_). Contributing ------------ Contributions are welcome, and step-by-step instructions can be found in our documentation (`docs/submittingpatches.html <https://mesa3d.org/submittingpatches.html>`_). Note that Mesa uses email mailing-lists for patches submission, review and discussions.