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…elative The semantics of `llvm.type.checked.load.relative` seem to be a little different from that of `llvm.load.relative`. It looks like the semantics for `llvm.type.checked.load.relative` is `ptr + offset + *(ptr + offset)` whereas the semantics for `llvm.load.relative` is `ptr + *(ptr + offset)`. That is, the offset for the former is added to the offset address whereas the later has the offset added to the original pointer. It really feels like the checked intrinsic was meant to match the semantics of the non-checked intrinsic, but I think for all cases the checked intrinsic is used (swift being the only use I know of), the calculation just happens to be the same because swift always uses an offset of zero. Likewise, all llvm tests for this intrinsic happen to use an offset of zero. Relative vtables in clang happens to be the first time where we're using this intrinsic and using it with non-zero values. This updates the semantics of the checked intrinsic to match the non-checked one. Effectively this shouldn't change any codegen by any users of this since all current users seem to use a zero offset. This PR also updates some tests with non-zero offsets.
213 lines
6.8 KiB
Markdown
213 lines
6.8 KiB
Markdown
<!-- This document is written in Markdown and uses extra directives provided by
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MyST (https://myst-parser.readthedocs.io/en/latest/). -->
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LLVM {{env.config.release}} Release Notes
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=========================================
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```{contents}
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```
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````{only} PreRelease
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```{warning} These are in-progress notes for the upcoming LLVM {{env.config.release}}
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release. Release notes for previous releases can be found on
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[the Download Page](https://releases.llvm.org/download.html).
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```
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````
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Introduction
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============
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This document contains the release notes for the LLVM Compiler Infrastructure,
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release {{env.config.release}}. Here we describe the status of LLVM, including
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major improvements from the previous release, improvements in various subprojects
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of LLVM, and some of the current users of the code. All LLVM releases may be
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downloaded from the [LLVM releases web site](https://llvm.org/releases/).
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For more information about LLVM, including information about the latest
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release, please check out the [main LLVM web site](https://llvm.org/). If you
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have questions or comments, the [Discourse forums](https://discourse.llvm.org)
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is a good place to ask them.
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Note that if you are reading this file from a Git checkout or the main
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LLVM web page, this document applies to the *next* release, not the current
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one. To see the release notes for a specific release, please see the
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[releases page](https://llvm.org/releases/).
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Non-comprehensive list of changes in this release
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=================================================
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<!-- For small 1-3 sentence descriptions, just add an entry at the end of
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this list. If your description won't fit comfortably in one bullet
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point (e.g. maybe you would like to give an example of the
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functionality, or simply have a lot to talk about), see the comment below
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for adding a new subsection. -->
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* ...
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<!-- If you would like to document a larger change, then you can add a
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subsection about it right here. You can copy the following boilerplate:
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Special New Feature
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-------------------
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Makes programs 10x faster by doing Special New Thing.
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-->
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Changes to the LLVM IR
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----------------------
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* The `nocapture` attribute has been replaced by `captures(none)`.
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* The constant expression variants of the following instructions have been
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removed:
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* `mul`
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* Updated semantics of `llvm.type.checked.load.relative` to match that of
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`llvm.load.relative`.
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Changes to LLVM infrastructure
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------------------------------
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* Removed support for target intrinsics being defined in the target directories
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themselves (i.e., the `TargetIntrinsicInfo` class).
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Changes to building LLVM
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------------------------
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Changes to TableGen
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-------------------
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Changes to Interprocedural Optimizations
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----------------------------------------
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Changes to the AArch64 Backend
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------------------------------
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Changes to the AMDGPU Backend
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-----------------------------
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Changes to the ARM Backend
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--------------------------
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Changes to the AVR Backend
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--------------------------
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Changes to the DirectX Backend
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------------------------------
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Changes to the Hexagon Backend
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------------------------------
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Changes to the LoongArch Backend
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--------------------------------
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Changes to the MIPS Backend
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---------------------------
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Changes to the PowerPC Backend
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------------------------------
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Changes to the RISC-V Backend
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-----------------------------
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* Adds experimental assembler support for the Qualcomm uC 'Xqcili` (Load Large Immediate)
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extension.
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* Adds experimental assembler support for the Qualcomm uC 'Xqcilia` (Large Immediate Arithmetic)
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extension.
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* Adds experimental assembler support for the Qualcomm uC 'Xqcibm` (Bit Manipulation)
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extension.
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* Adds experimental assembler and code generation support for the Qualcomm
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'Xqccmp' extension, which is a frame-pointer convention compatible version of
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Zcmp.
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* Added non-quadratic ``log-vrgather`` cost model for ``vrgather.vv`` instruction
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Changes to the WebAssembly Backend
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----------------------------------
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Changes to the Windows Target
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-----------------------------
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* `fp128` is now passed indirectly, meaning it uses the same calling convention
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as `i128`.
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Changes to the X86 Backend
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--------------------------
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Changes to the OCaml bindings
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-----------------------------
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Changes to the Python bindings
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------------------------------
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Changes to the C API
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--------------------
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* The following functions for creating constant expressions have been removed,
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because the underlying constant expressions are no longer supported. Instead,
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an instruction should be created using the `LLVMBuildXYZ` APIs, which will
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constant fold the operands if possible and create an instruction otherwise:
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* `LLVMConstMul`
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* `LLVMConstNUWMul`
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* `LLVMConstNSWMul`
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Changes to the CodeGen infrastructure
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-------------------------------------
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Changes to the Metadata Info
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---------------------------------
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Changes to the Debug Info
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---------------------------------
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Changes to the LLVM tools
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---------------------------------
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* llvm-objcopy now supports the `--update-section` flag for intermediate Mach-O object files.
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* llvm-strip now supports continuing to process files on encountering an error.
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* In llvm-objcopy's ELF port, `--discard-locals` and `--discard-all` now allow and preserve symbols referenced by relocations.
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Changes to LLDB
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---------------------------------
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* When building LLDB with Python support, the minimum version of Python is now
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3.8.
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* LLDB now supports hardware watchpoints for AArch64 Windows targets. Windows
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does not provide API to query the number of supported hardware watchpoints.
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Therefore current implementation allows only 1 watchpoint, as tested with
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Windows 11 on the Microsoft SQ2 and Snapdragon Elite X platforms.
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* LLDB now steps through C++ thunks. This fixes an issue where previously, it
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wouldn't step into multiple inheritance virtual functions.
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### Changes to lldb-dap
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* Breakpoints can now be set for specific columns within a line.
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* Function return value is now displayed on step-out.
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Changes to BOLT
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---------------------------------
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Changes to Sanitizers
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---------------------
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Other Changes
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-------------
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External Open Source Projects Using LLVM {{env.config.release}}
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===============================================================
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* A project...
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Additional Information
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======================
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A wide variety of additional information is available on the
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[LLVM web page](https://llvm.org/), in particular in the
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[documentation](https://llvm.org/docs/) section. The web page also contains
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versions of the API documentation which is up-to-date with the Git version of
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the source code. You can access versions of these documents specific to this
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release by going into the `llvm/docs/` directory in the LLVM tree.
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If you have any questions or comments about LLVM, please feel free to contact
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us via the [Discourse forums](https://discourse.llvm.org).
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