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Differential D142265

[AArch64] Function multi-versioning release notes added. NFC.
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Authored by ilinpv on Jan 20 2023, 4:41 PM.

Details

Reviewers
danielkiss
samtebbs
dmgreen
Commits
rGc57eaf1c8ce3: [AArch64] Function multi-versioning release notes added. NFC.

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Event Timeline

ilinpv created this revision.Jan 20 2023, 4:41 PM
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ilinpv requested review of this revision.Jan 20 2023, 4:41 PM
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Harbormaster completed remote builds in B209096: Diff 491005.Jan 20 2023, 6:50 PM
danielkiss accepted this revision.Jan 23 2023, 6:39 AM

LGTM Thanks

This revision is now accepted and ready to land.Jan 23 2023, 6:39 AM
This revision was landed with ongoing or failed builds.Jan 23 2023, 10:33 AM
Closed by commit rGc57eaf1c8ce3: [AArch64] Function multi-versioning release notes added. NFC. (authored by ilinpv). · Explain Why
This revision was automatically updated to reflect the committed changes.
ilinpv added a commit: rGc57eaf1c8ce3: [AArch64] Function multi-versioning release notes added. NFC..

Revision Contents

PathSize
clang/
docs/
9 lines
llvm/
docs/
4 lines

Diff 491446

clang/docs/ReleaseNotes.rst

Show First 20 Lines • Show All 608 Lines • ▼ Show 20 Lines- Updated the value returned by ``__has_c_attribute(fallthrough)`` to ``201910L``
used ``201904L`` (the date the proposal was seen by the committee) by mistake. used ``201904L`` (the date the proposal was seen by the committee) by mistake.
There were no other changes to the attribute behavior. There were no other changes to the attribute behavior.
- Introduced a new record declaration attribute ``__attribute__((enforce_read_only_placement))`` - Introduced a new record declaration attribute ``__attribute__((enforce_read_only_placement))``
to support analysis of instances of a given type focused on read-only program to support analysis of instances of a given type focused on read-only program
memory placement. It emits a warning if something in the code provably prevents memory placement. It emits a warning if something in the code provably prevents
an instance from a read-only memory placement. an instance from a read-only memory placement.
- Introduced new attribute ``__attribute__((target_version("cpu_features")))``
and expanded the functionality of the existing attribute
``__attribute__((target_clones("cpu_features1","cpu_features2",...)))`` to
support Function Multi Versioning on AArch64 target. It detects at runtime
which function versions are supported by CPU and calls the one with highest
priority. Refer to `clang attributes
<https://clang.llvm.org/docs/AttributeReference.html#target-version>`_ for
more details.
Windows Support Windows Support
--------------- ---------------
- For the MinGW driver, added the options ``-mguard=none``, ``-mguard=cf`` and - For the MinGW driver, added the options ``-mguard=none``, ``-mguard=cf`` and
``-mguard=cf-nochecks`` (equivalent to ``/guard:cf-``, ``/guard:cf`` and ``-mguard=cf-nochecks`` (equivalent to ``/guard:cf-``, ``/guard:cf`` and
``/guard:cf,nochecks`` in clang-cl) for enabling Control Flow Guard checks ``/guard:cf,nochecks`` in clang-cl) for enabling Control Flow Guard checks
and generation of address-taken function table. and generation of address-taken function table.
- Switched from SHA1 to BLAKE3 for PDB type hashing / ``-gcodeview-ghash`` - Switched from SHA1 to BLAKE3 for PDB type hashing / ``-gcodeview-ghash``
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llvm/docs/ReleaseNotes.rst

Show First 20 Lines • Show All 127 Lines • ▼ Show 20 Lines
Changes to the AArch64 Backend Changes to the AArch64 Backend
------------------------------ ------------------------------
* Added support for the Cortex-A715 CPU. * Added support for the Cortex-A715 CPU.
* Added support for the Cortex-X3 CPU. * Added support for the Cortex-X3 CPU.
* Added support for the Neoverse V2 CPU. * Added support for the Neoverse V2 CPU.
* Added support for assembly for RME MEC (Memory Encryption Contexts). * Added support for assembly for RME MEC (Memory Encryption Contexts).
* Added codegen support for the Armv8.3 Complex Number extension. * Added codegen support for the Armv8.3 Complex Number extension.
* Implemented `Function Multi Versioning
<https://arm-software.github.io/acle/main/acle.html#function-multi-versioning>`_
in accordance with Arm C Language Extensions specification. Currently in Beta
state.
Changes to the AMDGPU Backend Changes to the AMDGPU Backend
----------------------------- -----------------------------
Changes to the ARM Backend Changes to the ARM Backend
-------------------------- --------------------------
* Support for targeting Armv2, Armv2A, Armv3 and Armv3M has been removed. * Support for targeting Armv2, Armv2A, Armv3 and Armv3M has been removed.
▲ Show 20 Lines • Show All 201 Lines • Show Last 20 Lines