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read-only mirror of https://gitlab.freedesktop.org/mesa/mesa
b6b6d1ff3c
LLVM expects that exec != 0 when entering loops and generates this code
that becomes an infinite loop if exec == 0:
BB5_1:
vcc_lo = (inverted terminating condition)
s_and_b32 vcc_lo, exec_lo, vcc_lo
s_cbranch_vccnz BB5_3 // jump if vcc != 0 (break statement)
// ... loop body ...
s_branch BB5_1
BB5_3:
For non-monolithic VS before TCS, VS before GS, and TES before GS,
we set exec = (thread enabledmask), which sets 0 for HS-only and GS-only
waves, causing the infinite loop condition above.
Fix it as follows:
- set exec = ~0 at the beginning
- wrap the whole shader (LS and ES) in a conditional block, so that HS-only
and GS-only waves jump over it and never enter such a loop
The TES before GS hang can be reproduced by gfxbench:
testfw_app --gfx egl -w 1920 -h 1080 --gl_api gles -t gl_tess
Fixes:
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|---|---|---|
| .appveyor | ||
| .gitlab/issue_templates | ||
| .gitlab-ci | ||
| bin | ||
| build-support | ||
| docs | ||
| doxygen | ||
| include | ||
| scons | ||
| src | ||
| subprojects | ||
| .dir-locals.el | ||
| .editorconfig | ||
| .gitignore | ||
| .gitlab-ci.yml | ||
| .mailmap | ||
| .travis.yml | ||
| Android.common.mk | ||
| Android.mk | ||
| appveyor.yml | ||
| CleanSpec.mk | ||
| common.py | ||
| meson.build | ||
| meson_options.txt | ||
| README.rst | ||
| REVIEWERS | ||
| SConstruct | ||
| VERSION | ||
`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 `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.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.