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This commit adds the framework for cross-basic-block register allocation. Like ARM's compiler, we assume that the value registers aren't usable across branches, which means we have to use physical registers to store any value that crosses a basic block. There are three parts to this: 1. When translating from NIR, we rely on the NIR out-of-ssa pass to coalesce values into registers. We insert store_reg instructions for values used in more than one basic block, and load_reg instructions for values not defined in the same basic block (or defined after their use, for loops). So by the time we've translated out of NIR we've already split things into values (which are only used in the same basic block) and registers (which are only used in different basic blocks than where they're defined). 2. We allocate the registers at the same time that we allocate the values, before the final scheduler. Unlike the values, where the assigned color is fake, we assign the actual physical index & component to physregs at this stage. load_reg and store_reg are treated as moves in the allocator and when creating write-after-read dependencies. 3. Finally, in the main scheduler we have to avoid overwriting existing live physregs when spilling. First, we have to tell the scheduler which physical registers are live at the end of each block, to avoid overwriting those. If a register is only live at the beginning, we can reuse it for spilling after the last original use in the final program happens, i.e. before any original use is scheduled, but we have to be careful to add the proper dependencies so that the spill write is scheduled before the original reads. To handle this we repurpose reg_link for uses to be used by the scheduler. A few register-related things copied over from NIR or from other drivers can be dropped. Reviewed-by: Vasily Khoruzhick <anarsoul@gmail.com> |
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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.