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[docs] Linkify llvm-reduce and mention it is multi-threaded (#148904)

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Thurston Dang 2025-07-15 11:13:59 -07:00 committed by GitHub
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13
llvm/docs/HowToSubmitABug.rst
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@ -112,15 +112,20 @@ If this does crash, then you should be able to debug this with the following
Run this, then file a bug with the instructions and reduced .bc
files that bugpoint emits.
If bugpoint doesn't reproduce the crash, ``llvm-reduce`` is an alternative
way to reduce LLVM IR. Create a script that repros the crash and run:
If bugpoint doesn't reproduce the crash,
:doc:`llvm-reduce <CommandGuide/llvm-reduce>` is an alternative way to reduce
LLVM IR. Create a script that repros the crash and run:
.. code-block:: bash
llvm-reduce --test=path/to/script foo.bc
which should produce reduced IR that reproduces the crash. Be warned the
``llvm-reduce`` is still fairly immature and may crash.
which should produce reduced IR that reproduces the crash.
.. TIP::
``llvm-reduce`` is still fairly immature and may crash. On the other hand,
unlike ``bugpoint``, ``llvm-reduce -j $NUM_THREADS`` is multi-threaded and
can therefore potentially be much faster.
If none of the above work, you can get the IR before a crash by running the
``opt`` command with the ``--print-before-all --print-module-scope`` flags to