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LLVM {{env.config.release}} Release Notes
=========================================

```{contents}
```

````{only} PreRelease
```{warning} These are in-progress notes for the upcoming LLVM {{env.config.release}}
             release. Release notes for previous releases can be found on
             [the Download Page](https://releases.llvm.org/download.html).
```
````

Introduction
============

This document contains the release notes for the LLVM Compiler Infrastructure,
release {{env.config.release}}.  Here we describe the status of LLVM, including
major improvements from the previous release, improvements in various subprojects
of LLVM, and some of the current users of the code.  All LLVM releases may be
downloaded from the [LLVM releases web site](https://llvm.org/releases/).

For more information about LLVM, including information about the latest
release, please check out the [main LLVM web site](https://llvm.org/).  If you
have questions or comments, the [Discourse forums](https://discourse.llvm.org)
is a good place to ask them.

Note that if you are reading this file from a Git checkout or the main
LLVM web page, this document applies to the *next* release, not the current
one.  To see the release notes for a specific release, please see the
[releases page](https://llvm.org/releases/).

Non-comprehensive list of changes in this release
=================================================

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* ...

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Special New Feature
-------------------

Makes programs 10x faster by doing Special New Thing.
-->

Changes to the LLVM IR
----------------------

* The `nocapture` attribute has been replaced by `captures(none)`.
* The constant expression variants of the following instructions have been
  removed:

  * `mul`

* Updated semantics of `llvm.type.checked.load.relative` to match that of
  `llvm.load.relative`.

Changes to LLVM infrastructure
------------------------------

* Removed support for target intrinsics being defined in the target directories
  themselves (i.e., the `TargetIntrinsicInfo` class).

Changes to building LLVM
------------------------

Changes to TableGen
-------------------

Changes to Interprocedural Optimizations
----------------------------------------

Changes to the AArch64 Backend
------------------------------

Changes to the AMDGPU Backend
-----------------------------

* Enabled the
  [FWD_PROGRESS bit](https://llvm.org/docs/AMDGPUUsage.html#code-object-v3-kernel-descriptor)
  for all GFX ISAs greater or equal to 10, for the AMDHSA OS.

* Bump the default `.amdhsa_code_object_version` to 6. ROCm 6.3 is required to run any program compiled with COV6.

Changes to the ARM Backend
--------------------------

Changes to the AVR Backend
--------------------------

Changes to the DirectX Backend
------------------------------

Changes to the Hexagon Backend
------------------------------

* The default Hexagon architecture version in ELF object files produced by
  the tools such as llvm-mc is changed to v68. This version will be set if
  the user does not provide the CPU version in the command line.

Changes to the LoongArch Backend
--------------------------------

* Changing the default code model from `small` to `medium` for 64-bit.

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

* `-mcpu=i6400` and `-mcpu=i6500` were added.

Changes to the PowerPC Backend
------------------------------

Changes to the RISC-V Backend
-----------------------------

* Adds experimental assembler support for the Qualcomm uC 'Xqcilb` (Long Branch)
  extension.
* Adds experimental assembler support for the Qualcomm uC 'Xqcili` (Load Large Immediate)
  extension.
* Adds experimental assembler support for the Qualcomm uC 'Xqcilia` (Large Immediate Arithmetic)
  extension.
* Adds experimental assembler support for the Qualcomm uC 'Xqcibm` (Bit Manipulation)
  extension.
* Adds experimental assembler support for the Qualcomm uC 'Xqcibi` (Branch Immediate)
  extension.
* Adds experimental assembler and code generation support for the Qualcomm
  'Xqccmp' extension, which is a frame-pointer convention compatible version of
  Zcmp.
* Added non-quadratic ``log-vrgather`` cost model for ``vrgather.vv`` instruction
* Adds experimental assembler support for the Qualcomm uC 'Xqcisim` (Simulation Hint)
  extension.
* Adds experimental assembler support for the Qualcomm uC 'Xqcisync` (Sync Delay)
  extension.
* Adds experimental assembler support for the Qualcomm uC 'Xqciio` (External Input Output)
  extension.
* Adds assembler support for the 'Zilsd` (Load/Store Pair Instructions)
  extension.
* Adds assembler support for the 'Zclsd` (Compressed Load/Store Pair Instructions)
  extension.
* Adds experimental assembler support for Zvqdotq.
* Adds Support for Qualcomm's `qci-nest` and `qci-nonest` interrupt types, which
  use instructions from `Xqciint` to save and restore some GPRs during interrupt
  handlers.
* When the experimental extension `Xqcili` is enabled, `qc.e.li` and `qc.li` may
  now be used to materialize immediates.
* Adds assembler support for ``.option exact``, which disables automatic compression,
  and branch and linker relaxation. This can be disabled with ``.option noexact``,
  which is also the default.

Changes to the WebAssembly Backend
----------------------------------

Changes to the Windows Target
-----------------------------

* `fp128` is now passed indirectly, meaning it uses the same calling convention
  as `i128`.

Changes to the X86 Backend
--------------------------

Changes to the OCaml bindings
-----------------------------

Changes to the Python bindings
------------------------------

Changes to the C API
--------------------

* The following functions for creating constant expressions have been removed,
  because the underlying constant expressions are no longer supported. Instead,
  an instruction should be created using the `LLVMBuildXYZ` APIs, which will
  constant fold the operands if possible and create an instruction otherwise:

  * `LLVMConstMul`
  * `LLVMConstNUWMul`
  * `LLVMConstNSWMul`

Changes to the CodeGen infrastructure
-------------------------------------

Changes to the Metadata Info
---------------------------------

Changes to the Debug Info
---------------------------------

Changes to the LLVM tools
---------------------------------

* llvm-objcopy now supports the `--update-section` flag for intermediate Mach-O object files.
* llvm-strip now supports continuing to process files on encountering an error.
* In llvm-objcopy/llvm-strip's ELF port, `--discard-locals` and `--discard-all` now allow and preserve symbols referenced by relocations.
  ([#47468](https://github.com/llvm/llvm-project/issues/47468))

Changes to LLDB
---------------------------------

* When building LLDB with Python support, the minimum version of Python is now
  3.8.
* LLDB now supports hardware watchpoints for AArch64 Windows targets. Windows
  does not provide API to query the number of supported hardware watchpoints.
  Therefore current implementation allows only 1 watchpoint, as tested with
  Windows 11 on the Microsoft SQ2 and Snapdragon Elite X platforms.
* LLDB now steps through C++ thunks. This fixes an issue where previously, it
  wouldn't step into multiple inheritance virtual functions.
* A statusline was added to command-line LLDB to show progress events and
  information about the current state of the debugger at the bottom of the
  terminal. This is on by default and can be configured using the
  `show-statusline` and `statusline-format` settings.
* The `min-gdbserver-port` and `max-gdbserver-port` options have been removed
  from `lldb-server`'s platform mode. Since the changes to `lldb-server`'s port
  handling in LLDB 20, these options have had no effect.

### Changes to lldb-dap

* Breakpoints can now be set for specific columns within a line.
* Function return value is now displayed on step-out.

Changes to BOLT
---------------------------------

Changes to Sanitizers
---------------------

Other Changes
-------------

External Open Source Projects Using LLVM {{env.config.release}}
===============================================================

* A project...

Additional Information
======================

A wide variety of additional information is available on the
[LLVM web page](https://llvm.org/), in particular in the
[documentation](https://llvm.org/docs/) section.  The web page also contains
versions of the API documentation which is up-to-date with the Git version of
the source code.  You can access versions of these documents specific to this
release by going into the `llvm/docs/` directory in the LLVM tree.

If you have any questions or comments about LLVM, please feel free to contact
us via the [Discourse forums](https://discourse.llvm.org).