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read-only mirror of https://gitlab.freedesktop.org/mesa/mesa
a93bc6afc4
We already skip emitting ftrunc in nir_lower_int_to_float when there is ffloor, fround or any other integer-making opcode preceding f2i32. However if lower_ffloor is set for driver that doesn't support integers, the lowered x - ffract(x) patterns would not be recognized and extra ftruct would be emitted, doing unnecessary rounding. This optimization only works if there is no non-trivial swizzling used for the fadd, fneg and ffract involved, which seems to be 99% of the cases according to my testing. This is needed to enable nir ffloor lowering on r300 driver without regressions. I'm not sure if this helps anybody else, the only hardware which sets lower_ffloor and converts ints to floats (and can't do trunc) are some old etnaviv cards, so maybe it will help there a bit. Signed-off-by: Pavel Ondračka <pavel.ondracka@gmail.com> Reviewed-by: Emma Anholt <emma@anholt.net> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/20208> |
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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://mesa3d.org/install.html>`_), but the recommended way is to use Meson (`docs/meson.rst <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 `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://mesa3d.org/bugs.html>`_). Contributing ------------ Contributions are welcome, and step-by-step instructions can be found in our documentation (`docs/submittingpatches.rst <https://mesa3d.org/submittingpatches.html>`_). Note that Mesa uses gitlab for patches submission, review and discussions.