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[docs] Add llvm & clang release notes for LoongArch #79097

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Jan 23, 2024
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[docs] Add llvm & clang release notes for LoongArch #79097

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14 changes: 12 additions & 2 deletions clang/docs/ReleaseNotes.rst
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Expand Up @@ -1189,8 +1189,14 @@ Windows Support

LoongArch Support
^^^^^^^^^^^^^^^^^
- The ``model`` attribute is now supported for overriding the default code
model used to access global variables. The following values are supported:
- Added builtins support for all LSX (128-bits SIMD) and LASX (256-bits SIMD)
instructions.
- Added builtins support for approximate calculation instructions that were
introduced in LoongArch Reference Manual V1.10.
- Made ``-mcmodel=`` compatible with LoongArch gcc that accepted ``normal``,
``medium`` and ``extreme``.
- The ``model`` attribute was now supported for overriding the default code
model used to access global variables. The following values were supported:
``normal``, ``medium`` and ``extreme``.

*Example Code*:
Expand All @@ -1199,6 +1205,10 @@ LoongArch Support

int var __attribute((model("extreme")));

- Default to ``-fno-direct-access-external-data`` for non-PIC.
- An ABI mismatch with gcc/g++ about empty structs/unions passing was fixed.
- ``_mcount`` was generated instead of ``mcount``.

RISC-V Support
^^^^^^^^^^^^^^
- Unaligned memory accesses can be toggled by ``-m[no-]unaligned-access`` or the
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17 changes: 15 additions & 2 deletions llvm/docs/ReleaseNotes.rst
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Expand Up @@ -132,8 +132,21 @@ Changes to the Hexagon Backend

Changes to the LoongArch Backend
--------------------------------
* The code model of global variables can now be overridden by means of
the newly added LLVM IR attribute, ``code_model``.

* Added intrinsics support for all LSX (128-bits SIMD) and LASX (256-bits SIMD)
instructions.
* Added definition and intrinsics support for new instructions that were
introduced in LoongArch Reference Manual V1.10.
* Emitted adjacent ``pcaddu18i+jirl`` instrunction sequence with one relocation
``R_LARCH_CALL36`` instead of ``pcalau12i+jirl`` with two relocations
``R_LARCH_PCALA_{HI20,LO12}`` for function call in medium code model.
* The code model of global variables can now be overridden by means of the newly
added LLVM IR attribute, ``code_model``.
* Added support for the ``llvm.is.fpclass`` intrinsic.
* ``mulodi4`` and ``muloti4`` libcalls were disabled due to absence in libgcc.
* Added initial support for auto vectorization.
* Added initial support for linker relaxation.
* Assorted codegen improvements.

Changes to the MIPS Backend
---------------------------
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