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Differential D75226

[ReleaseNotes] Mention freeze instruction
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Authored by aqjune on Feb 26 2020, 9:14 PM.

Details

Reviewers
hans
nlopes
regehr
aqjune
Commits
rG3b6f4c544be4: [ReleaseNotes] Mention freeze instruction

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Event Timeline

aqjune created this revision.Feb 26 2020, 9:14 PM
Herald added a project: Restricted Project. · View Herald TranscriptFeb 26 2020, 9:14 PM
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aqjune added reviewers: hans, nlopes, regehr.Feb 26 2020, 9:16 PM
regehr added a comment.Feb 26 2020, 9:23 PM

This seems good to me.

Harbormaster completed remote builds in B47385: Diff 246878.Feb 26 2020, 9:33 PM
aqjune accepted this revision.Feb 27 2020, 4:49 AM

Reflected via https://github.com/llvm/llvm-project/commit/3b6f4c544be48dcfa663cfb62da3fd4e779954a5

This revision is now accepted and ready to land.Feb 27 2020, 4:49 AM
aqjune closed this revision.Feb 27 2020, 4:50 AM

Revision Contents

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llvm/
docs/
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Diff 246878

llvm/docs/ReleaseNotes.rst

Show First 20 Lines • Show All 80 Lines • ▼ Show 20 Lines* As per :ref:`LLVM Language Reference Manual <i_getelementptr>`,
inbounds P, Idx..), null -> icmp eq/ne P, null``) LLVM uses that for inbounds P, Idx..), null -> icmp eq/ne P, null``) LLVM uses that for
transformations. If the original source violates these requirements this transformations. If the original source violates these requirements this
may result in code being miscompiled. If you are using Clang front-end, may result in code being miscompiled. If you are using Clang front-end,
Undefined Behaviour Sanitizer ``-fsanitize=pointer-overflow`` check Undefined Behaviour Sanitizer ``-fsanitize=pointer-overflow`` check
will now catch such cases. will now catch such cases.
* Windows Control Flow Guard: the ``-cfguard`` option now emits CFG checks on * Windows Control Flow Guard: the ``-cfguard`` option now emits CFG checks on
indirect function calls. The previous behavior is still available with the indirect function calls. The previous behavior is still available with the
``-cfguard-nochecks`` option. Note that this feature should always be used ``-cfguard-nochecks`` option. Note that this feature should always be used
with optimizations enabled. with optimizations enabled.
* ``Callbacks`` have been added to ``CommandLine Options``. These can * ``Callbacks`` have been added to ``CommandLine Options``. These can
be used to validate of selectively enable other options. be used to validate of selectively enable other options.
* The function attributes ``no-frame-pointer-elim`` and * The function attributes ``no-frame-pointer-elim`` and
``no-frame-pointer-elim-non-leaf`` have been replaced by ``frame-pointer``, ``no-frame-pointer-elim-non-leaf`` have been replaced by ``frame-pointer``,
which has 3 values: ``none``, ``non-leaf``, and ``all``. The values mean what which has 3 values: ``none``, ``non-leaf``, and ``all``. The values mean what
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* Unnamed function arguments now get printed with their automatically * Unnamed function arguments now get printed with their automatically
generated name (e.g. "i32 %0") in definitions. This may require front-ends generated name (e.g. "i32 %0") in definitions. This may require front-ends
to update their tests; if so there is a script utils/add_argument_names.py to update their tests; if so there is a script utils/add_argument_names.py
that correctly converted 80-90% of Clang tests. Some manual work will almost that correctly converted 80-90% of Clang tests. Some manual work will almost
certainly still be needed. certainly still be needed.
* A new `freeze` instruction is added. The `freeze` instruction is used to stop
IR-level propagation of undef and poison values. Currently its support is
preliminary; a freeze-equivalent operation for SelDag/MIR needs to be added.
Changes to building LLVM Changes to building LLVM
------------------------ ------------------------
... ...
Changes to the AArch64 Backend Changes to the AArch64 Backend
------------------------------ ------------------------------
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