b14e83d1a4
We currently have log, log2, log10, exp and exp2 intrinsics. Add exp10 to fix this asymmetry. AMDGPU already has most of the code for f32 exp10 expansion implemented alongside exp, so the current implementation is duplicating nearly identical effort between the compiler and library which is inconvenient. https://reviews.llvm.org/D157871
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============================
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LLVM |release| Release Notes
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============================
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.. contents::
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:local:
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.. only:: PreRelease
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.. warning::
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These are in-progress notes for the upcoming LLVM |version| release.
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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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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 |release|. Here we describe the status of LLVM, including major improvements
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from the previous release, improvements in various subprojects of LLVM, and
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some of the current users of the code. All LLVM releases may be downloaded
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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
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<https://discourse.llvm.org>`_ is a good place to ask
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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 `releases
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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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.. NOTE
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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 `NOTE` below
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for adding a new subsection.
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* ...
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Update on required toolchains to build LLVM
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-------------------------------------------
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Changes to the LLVM IR
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----------------------
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* The `llvm.stacksave` and `llvm.stackrestore` intrinsics now use
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an overloaded pointer type to support non-0 address spaces.
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* The constant expression variants of the following instructions have been
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removed:
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* ``and``
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* ``or``
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* Added `llvm.exp10` intrinsic.
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Changes to LLVM infrastructure
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------------------------------
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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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* `llvm.sqrt.f64` is now lowered correctly. Use `llvm.amdgcn.sqrt.f64`
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for raw instruction access.
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* Implemented `llvm.stacksave` and `llvm.stackrestore` intrinsics.
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* Implemented :ref:`llvm.get.rounding <int_get_rounding>`
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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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* Zihintntl extension version was upgraded to 1.0 and is no longer experimental.
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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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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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* The python bindings have been removed.
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Changes to the C API
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--------------------
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* Added ``LLVMGetTailCallKind`` and ``LLVMSetTailCallKind`` to
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allow getting and setting ``tail``, ``musttail``, and ``notail``
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attributes on call instructions.
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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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* ``LLVMConstAnd``
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* ``LLVMConstOr``
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Changes to the CodeGen infrastructure
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-------------------------------------
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* ``PrologEpilogInserter`` no longer supports register scavenging
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during forwards frame index elimination. Targets should use
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backwards frame index elimination instead.
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* ``RegScavenger`` no longer supports forwards register
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scavenging. Clients should use backwards register scavenging
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instead, which is preferred because it does not depend on accurate
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kill flags.
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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-symbolizer now treats invalid input as an address for which source
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information is not found.
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Changes to LLDB
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---------------------------------
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* Methods in SBHostOS related to threads have had their implementations
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removed. These methods will return a value indicating failure.
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Changes to Sanitizers
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---------------------
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* HWASan now defaults to detecting use-after-scope bugs.
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Other Changes
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-------------
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* The ``Flags`` field of ``llvm::opt::Option`` has been split into ``Flags``
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and ``Visibility`` to simplify option sharing between various drivers (such
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as ``clang``, ``clang-cl``, or ``flang``) that rely on Clang's Options.td.
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Overloads of ``llvm::opt::OptTable`` that use ``FlagsToInclude`` have been
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deprecated. There is a script and instructions on how to resolve conflicts -
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see https://reviews.llvm.org/D157150 and https://reviews.llvm.org/D157151 for
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details.
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* On Linux, FreeBSD, and NetBSD, setting the environment variable
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``LLVM_ENABLE_SYMBOLIZER_MARKUP`` causes tools to print stacktraces using
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:doc:`Symbolizer Markup <SymbolizerMarkupFormat>`.
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This works even if the tools have no embedded symbol information (i.e. are
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fully stripped); :doc:`llvm-symbolizer <CommandGuide/llvm-symbolizer>` can
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symbolize the markup afterwards using ``debuginfod``.
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External Open Source Projects Using LLVM 15
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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 `LLVM web page
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<https://llvm.org/>`_, in particular in the `documentation
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<https://llvm.org/docs/>`_ section. The web page also contains versions of the
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API documentation which is up-to-date with the Git version of the source
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code. You can access versions of these documents specific to this release by
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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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