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Now, we do scheduling at the same time as value register allocation. The ready list now acts similarly to the array of registers in value_regalloc, keeping us from running out of slots. Before this, the value register allocator wasn't aware of the scheduling constraints of the actual machine, which meant that it sometimes chose the wrong false dependencies to insert. Now, we assign value registers at the same time as we actually schedule instructions, making its choices reflect reality much better. It was also conservative in some cases where the new scheme doesn't have to be. For example, in something like: 1 = ld_att 2 = ld_uni 3 = add 1, 2 It's possible that one of 1 and 2 can't be scheduled in the same instruction as 3, meaning that a move needs to be inserted, so the value register allocator needs to assume that this sequence requires two registers. But when actually scheduling, we could discover that 1, 2, and 3 can all be scheduled together, so that they only require one register. The new scheduler speculatively inserts the instruction under consideration, as well as all of its child load instructions, and then counts the number of live value registers after all is said and done. This lets us be more aggressive with scheduling when we're close to the limit. With the new scheduler, the kmscube vertex shader is now scheduled in 40 instructions, versus 66 before. Acked-by: Qiang Yu <yuq825@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.