| ========================= |
| LLVM 13.0.0 Release Notes |
| ========================= |
| |
| .. contents:: |
| :local: |
| |
| .. warning:: |
| These are in-progress notes for the upcoming LLVM 13 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 13.0.0. 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 `LLVM Developer's Mailing List |
| <https://lists.llvm.org/mailman/listinfo/llvm-dev>`_ is a good place to send |
| 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 |
| ================================================= |
| .. NOTE |
| For small 1-3 sentence descriptions, just add an entry at the end of |
| this list. If your description won't fit comfortably in one bullet |
| point (e.g. maybe you would like to give an example of the |
| functionality, or simply have a lot to talk about), see the `NOTE` below |
| for adding a new subsection. |
| |
| |
| .. NOTE |
| If you would like to document a larger change, then you can add a |
| subsection about it right here. You can copy the following boilerplate |
| and un-indent it (the indentation causes it to be inside this comment). |
| |
| Special New Feature |
| ------------------- |
| |
| Makes programs 10x faster by doing Special New Thing. |
| |
| * Windows Control-flow Enforcement Technology: the ``-ehcontguard`` option now |
| emits valid unwind entrypoints which are validated when the context is being |
| set during exception handling. |
| |
| Changes to the LLVM IR |
| ---------------------- |
| |
| * The ``inalloca`` attribute now has a mandatory type field, similar |
| to ``byval`` and ``sret``. |
| |
| * The opaque pointer type ``ptr`` has been introduced. It is still in the |
| process of being worked on and should not be used yet. |
| |
| Changes to building LLVM |
| ------------------------ |
| |
| * The build system now supports building multiple distributions, so that you can |
| e.g. have one distribution containing just tools and another for libraries (to |
| enable development). See :ref:`Multi-distribution configurations` for details. |
| |
| Changes to TableGen |
| ------------------- |
| |
| Changes to the AArch64 Backend |
| ------------------------------ |
| |
| * Introduced support for Armv9-A's Realm Management Extension. |
| |
| Changes to the ARM Backend |
| -------------------------- |
| |
| During this release ... |
| |
| Changes to the MIPS Target |
| -------------------------- |
| |
| During this release ... |
| |
| Changes to the Hexagon Target |
| ----------------------------- |
| |
| * The Hexagon target now supports V68/HVX ISA. |
| |
| Changes to the PowerPC Target |
| ----------------------------- |
| |
| During this release ... |
| |
| Changes to the X86 Target |
| ------------------------- |
| |
| During this release ... |
| |
| Changes to the AMDGPU Target |
| ----------------------------- |
| |
| During this release ... |
| |
| Changes to the AVR Target |
| ----------------------------- |
| |
| During this release ... |
| |
| Changes to the WebAssembly Target |
| --------------------------------- |
| |
| During this release ... |
| |
| Changes to the OCaml bindings |
| ----------------------------- |
| |
| |
| Changes to the C API |
| -------------------- |
| |
| * The C API functions ``LLVMGetAlignment`` and ``LLVMSetAlignment`` now allow |
| changing alignment on atomicrmw and cmpxchg instructions |
| |
| * A new entry ``LLVMDIArgListMetadataKind`` was added to the |
| ``LLVMMetadataKind`` enum, representing DIArgLists |
| (`D88175 <https://reviews.llvm.org/D88175>`_) |
| |
| * Type attributes have been added to LLVM-C, introducing |
| LLVMCreateTypeAttribute, LLVMGetTypeAttributeValue and LLVMIsTypeAttribute. |
| (`D977763' <https://reviews.llvm.org/D97763>`_) |
| |
| * The ``LTO_API_VERSION`` was bumped to 28, introducing a new function |
| ``lto_set_debug_options`` for parsing LTO debug options |
| (`D92611 <https://reviews.llvm.org/D92611>`_) |
| |
| * ``LLVMJITTargetSymbolFlags`` was renamed to ``LLVMJITSymbolTargetFlags`` |
| (`rG8d718a0bff73af066675a6258c01307937c33cf9 |
| <https://reviews.llvm.org/rG8d718a0bff73af066675a6258c01307937c33cf9>`_) |
| |
| * The C API received support for creating custom ORCv2 MaterializationUnits and |
| APIs to retrieve an LLJIT instance's linking layers. An ABI breaking change |
| for ``LLVMOrcAbsoluteSymbols`` was introduced to make it consistent with |
| ``LLVMOrcCreateCustomMaterializationUnit``. |
| (`rGc8fc5e3ba942057d6c4cdcd1faeae69a28e7b671 |
| <https://reviews.llvm.org/rGc8fc5e3ba942057d6c4cdcd1faeae69a28e7b671>`_) |
| |
| * The C API received support for adding ORCv2 object buffers directly to an object |
| layer. (`rG7b73cd684a8d5fb44d34064200f10e2723085c33 |
| <https://reviews.llvm.org/rG7b73cd684a8d5fb44d34064200f10e2723085c33>`_) |
| |
| * A breaking change to ``LLVMGetInlineAsm`` was introduced, adding a ninth |
| argument ``LLVMBool CanThrow`` (`D95745 <https://reviews.llvm.org/D95745>`_) |
| |
| * The C API received support for calling into the new pass manager. |
| (`D102136 <https://reviews.llvm.org/D102136>`_) |
| |
| * The C API function ``LLVMIntrinsicCopyOverloadedName`` has been deprecated. |
| Please migrate to ``LLVMIntrinsicCopyOverloadedName2`` which takes an extra |
| module argument and which also handles unnamed types. |
| (`D99173 <https://reviews.llvm.org/D99173>`_) |
| |
| * The C API received support for dumping objects from ORCv2 |
| (`rGcec8e69f01c3374cb38c6683058381b96fab8f89 |
| <https://reviews.llvm.org/rGcec8e69f01c3374cb38c6683058381b96fab8f89>`_) |
| |
| * A breaking change to ``LLVMOrcObjectTransformLayerTransformFunction`` was |
| introduced, changing the order of the function pointer's arguments. |
| (`rG8962c68ad007a525f9daa987c99eda57e0d0069a |
| <https://reviews.llvm.org/rG8962c68ad007a525f9daa987c99eda57e0d0069a>`_) |
| |
| * The C API received support for accessing utilities from the LLJIT |
| ``IRTransformLayer`` and ``ThreadSafeModule`` classes. (`D103855 |
| <https://reviews.llvm.org/D103855>`_) |
| |
| * The C API received support for creating lazy-export MaterializationUnits |
| (`D104672 <https://reviews.llvm.org/D104672>`_) |
| |
| * The C API function ``LLVMPassBuilderOptionsSetCoroutines`` was removed because |
| couroutine passes have been enabled by default. (`D105877 |
| <https://reviews.llvm.org/D105877>`_) |
| |
| * ``comdat noduplicates`` was renamed to ``comdat nodeduplicate`` and as a |
| result, ``LLVMNoDuplicatesComdatSelectionKind`` was renamed to |
| ``LLVMNoDeduplicateComdatSelectionKind``. (`D106319 |
| <https://reviews.llvm.org/D106319>`_) |
| |
| Changes to the Go bindings |
| -------------------------- |
| |
| |
| Changes to the FastISel infrastructure |
| -------------------------------------- |
| |
| * FastISel no longer tracks killed registers, and instead leaves this to the |
| register allocator. This means that ``hasTrivialKill()`` is removed, as well |
| as the ``OpNIsKill`` parameters to the ``fastEmit_*()`` family of functions. |
| |
| Changes to the DAG infrastructure |
| --------------------------------- |
| |
| |
| Changes to the Debug Info |
| --------------------------------- |
| |
| During this release ... |
| |
| Changes to the LLVM tools |
| --------------------------------- |
| |
| * The options ``--build-id-link-{dir,input,output}`` have been deleted. |
| (`D96310 <https://reviews.llvm.org/D96310>`_) |
| |
| * Support for in-order processors has been added to ``llvm-mca``. |
| (`D94928 <https://reviews.llvm.org/D94928>`_) |
| |
| * llvm-objdump supports ``-M {att,intel}`` now. |
| ``--x86-asm-syntax`` is a deprecated internal option which will be removed in LLVM 14.0.0. |
| (`D101695 <https://reviews.llvm.org/D101695>`_) |
| |
| * The llvm-readobj short aliases ``-s`` (previously ``--sections``) and ``-t`` |
| (previously ``--syms``) have been changed to ``--syms`` and |
| ``--section-details`` respectively, to match llvm-readelf. |
| (`D105055 <https://reviews.llvm.org/D105055>`_) |
| |
| * The llvm-nm short aliases ``-M`` (``--print-armap``), ``-U`` |
| (``--defined-only``), and ``-W`` (``--no-weak``) are now deprecated. |
| Use the long form versions instead. |
| The alias ``--just-symbol-name`` is now deprecated in favor of |
| ``--format=just-symbols`` and ``-j``. |
| (`D105330 <https://reviews.llvm.org/D105330>`_) |
| |
| * In lli the default JIT engine switched from MCJIT (``-jit-kind=mcjit``) to ORC (``-jit-kind=orc``). |
| (`D98931 <https://reviews.llvm.org/D98931>`_) |
| |
| Changes to LLDB |
| --------------------------------- |
| |
| Changes to Sanitizers |
| --------------------- |
| |
| External Open Source Projects Using LLVM 13 |
| =========================================== |
| |
| * 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 `mailing lists <https://llvm.org/docs/#mailing-lists>`_. |
