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gh-101282: Apply BOLT optimisations to libpython for shared builds #104709

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Merged
erlend-aasland merged 4 commits into from
May 22, 2023
Merged

gh-101282: Apply BOLT optimisations to libpython for shared builds #104709

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555686d
gh-101282: rework the BOLT build process
indygreg May 20, 2023
52a266e
Fixup doc formatting
erlend-aasland May 21, 2023
3cf0f36
M4 style nits
erlend-aasland May 21, 2023
972dcb2
Remove extra backtick
erlend-aasland May 21, 2023
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Fixup doc formatting
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@erlend-aasland
erlend-aasland committed May 21, 2023
commit 52a266ebefe29d78e8e434cdb478c10005ad800e
15 changes: 8 additions & 7 deletions Doc/using/configure.rst
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Expand Up @@ -313,13 +313,14 @@ also be used to improve performance.
experimental for now. Because this tool operates on machine code its success
is dependent on a combination of the build environment + the other
optimization configure args + the CPU architecture, and not all combinations
are supported. BOLT versions before LLVM 16 are known to crash BOLT under
some scenarios. Use of LLVM 16 or newer for BOLT optimization is stronger
encouraged.

The ``BOLT_INSTRUMENT_FLAGS`` and ``BOLT_APPLY_FLAGS`` configure variables
can be defined to override the default set of arguments for ``llvm-bolt``
to instrument and apply BOLT data to binaries, respectively.
are supported.
BOLT versions before LLVM 16 are known to crash BOLT under some scenarios.
Use of LLVM 16 or newer for BOLT optimization is strongly encouraged.

The :envvar:`!BOLT_INSTRUMENT_FLAGS` and :envvar:`!BOLT_APPLY_FLAGS`
:program:`configure` variables can be defined to override the default set of
arguments for :program:`llvm-bolt`` to instrument and apply BOLT data to
binaries, respectively.

.. versionadded:: 3.12

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