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read-only mirror of https://gitlab.freedesktop.org/mesa/mesa
0a5200d051
The frexp lowering decomposes frexp into bit manipulation (fabs, ushr, iand, ior) that relies on implicit float-to-int bit reinterpretation. When lowered at 16-bit, the subsequent nir_lower_bit_size pass widens float operations with f2f32 (changing the bit pattern to IEEE fp32) and integer operations with u2u32 (zero-extending 16-bit bits). This breaks the reinterpretation: ushr on the fabs result gets f2f32-widened float bits instead of the original fp16 bit pattern, causing the sign bit to leak into the exponent extraction for negative inputs. Moving nir_lower_frexp into v3d_lower_nir after nir_lower_bit_size. This way frexp decomposition operates at 32-bit where float and integer operations share the same bit width, and the bit manipulation masks use the correct IEEE fp32 constants. Assisted-by: Claude Opus 4.7 Reviewed-by: Iago Toral Quiroga <itoral@igalia.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/41810> |
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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.