[docs][mips] 10.0 Release notes

[atanasyan]

Summary

MIPS specific part of LLVM 10.0 Release notes for LLVM, Clang and LLD.

[mstojanovic]

Initial MIPS support was also added to llvm-exegesis.

[atanasyan]

In D73108#1831442, @mstojanovic wrote:

Initial MIPS support was also added to llvm-exegesis.

Oh, sorry. Good point, I'll add this note.

[atanasyan]

• Add llvm-exegesis note.

[hans]

Thanks for writing release notes! Go ahead and push directly to the release/10.x branch when you're ready.

[atanasyan]

Closed by commit rG27f93515.

clang/docs/ReleaseNotes.rst

* Lax vector conversions involving floating-point vectors have been disabled
   by default, and can no longer be enabled with ``-flax-vector-conversions``.
   This matches the behavior of these flags in GCC, but code relying on implicit
   vector bitcasts between integer and floating-point types that used to compile
   with older versions of Clang is no longer accepted by default in Clang 10.
   The old behavior can be restored with ``-flax-vector-conversions=all``.
   In a future release of Clang, we intend to change the default to
   ``-fno-lax-vector-conversions``.
 
+* Improved support for ``octeon`` MIPS-family CPU. Added ``octeon+`` to
+  the list of of CPUs accepted by the driver.
+
 New Compiler Flags
 ------------------
 
 - The -fgnuc-version= flag now controls the value of ``__GNUC__`` and related
   macros. This flag does not enable or disable any GCC extensions implemented in
   Clang. Setting the version to zero causes Clang to leave ``__GNUC__`` and
   other GNU-namespaced macros, such as ``__GXX_WEAK__``, undefined.
 

lld/docs/ReleaseNotes.rst

 ----------------
 
 * Glob pattern, which you can use in linker scripts or version scripts,
   now supports `\` and `[!...]`. Except character classes
   (e.g. `[[:digit:]]`), lld's glob pattern should be fully compatible
   with GNU now. (`r375051
   <https://github.com/llvm/llvm-project/commit/48993d5ab9413f0e5b94dfa292a233ce55b09e3e>`_)
 
+* New ``elf32btsmipn32_fbsd`` and ``elf32ltsmipn32_fbsd`` emulations
+  are supported.
+
+* Relax MIPS ``jalr``and ``jr`` instructions marked by the ``R_MIPS_JALR``
+  relocation.
+
+* Reduced size of linked MIPS binaries.
+
 COFF Improvements
 -----------------
 
 * ...
 
 MinGW Improvements
 ------------------
 

llvm/docs/ReleaseNotes.rst

 --------------------------
 
  During this release ...
 
 
 Changes to the MIPS Target
 --------------------------
 
- During this release ...
-
+* Improved support for ``octeon`` and added support for ``octeon+``
+  MIPS-family CPU.
+* ``min``, ``max``, ``umin``, ``umax`` atomics now supported on MIPS targets.
+* Now PC-relative relocations are generated for ``.eh_frame`` sections when
+  possible. That allows to link MIPS binaries without having to pass the
+  ``-Wl,-z,notext`` option.
+* Fix evaluating J-format branch (``j``, ``jal``, ...) targets when the
+  instruction is not in the first 256 MB region.
+* Fixed ``jal``, ``sc``, ``scs``, ``ll``, ``lld``, ``la``, ``lw``, ``sw``
+  instructions expanding. Now they accept more types of expression as arguments,
+  correctly handle load/store for ``XGOT`` model, expand using less instructions
+  or registers.
+* Initial MIPS support has been added to ``llvm-exegesis``.
+* Generates ``_mcount`` calls using proper MIPS ABI.
+* Improved support of GlobalISel instruction selection framework. This feature
+  is still in experimental state for MIPS targets though.
 
 Changes to the PowerPC Target
 -----------------------------
 
  During this release ...
 
 Changes to the X86 Target
 -------------------------