| ======================== |
| LLVM 5.0.0 Release Notes |
| ======================== |
| |
| .. contents:: |
| :local: |
| |
| .. warning:: |
| These are in-progress notes for the upcoming LLVM 5 release. |
| Release notes for previous releases can be found on |
| `the Download Page <http://releases.llvm.org/download.html>`_. |
| |
| |
| Introduction |
| ============ |
| |
| This document contains the release notes for the LLVM Compiler Infrastructure, |
| release 5.0.0. 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 <http://llvm.org/releases/>`_. |
| |
| For more information about LLVM, including information about the latest |
| release, please check out the `main LLVM web site <http://llvm.org/>`_. If you |
| have questions or comments, the `LLVM Developer's Mailing List |
| <http://lists.llvm.org/mailman/listinfo/llvm-dev>`_ is a good place to send |
| them. |
| |
| Note that if you are reading this file from a Subversion 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 <http://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. |
| |
| * LLVM's ``WeakVH`` has been renamed to ``WeakTrackingVH`` and a new ``WeakVH`` |
| has been introduced. The new ``WeakVH`` nulls itself out on deletion, but |
| does not track values across RAUW. |
| |
| * A new library named ``BinaryFormat`` has been created which holds a collection |
| of code which previously lived in ``Support``. This includes the |
| ``file_magic`` structure and ``identify_magic`` functions, as well as all the |
| structure and type definitions for DWARF, ELF, COFF, WASM, and MachO file |
| formats. |
| |
| * The tool ``llvm-pdbdump`` has been renamed ``llvm-pdbutil`` to better reflect |
| its nature as a general purpose PDB manipulation / diagnostics tool that does |
| more than just dumping contents. |
| |
| * The ``BBVectorize`` pass has been removed. It was fully replaced and no |
| longer used back in 2014 but we didn't get around to removing it. Now it is |
| gone. The SLP vectorizer is the suggested non-loop vectorization pass. |
| |
| .. 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. |
| |
| Changes to the LLVM IR |
| ---------------------- |
| |
| * The datalayout string may now indicate an address space to use for |
| the pointer type of alloca rather than the default of 0. |
| |
| * Added speculatable attribute indicating a function which does has no |
| side-effects which could inhibit hoisting of calls. |
| |
| Changes to the ARM Backend |
| -------------------------- |
| |
| During this release ... |
| |
| |
| Changes to the MIPS Target |
| -------------------------- |
| |
| During this release ... |
| |
| |
| Changes to the PowerPC Target |
| ----------------------------- |
| |
| During this release ... |
| |
| Changes to the X86 Target |
| ------------------------- |
| |
| * Added initial AMD Ryzen (znver1) scheduler support. |
| |
| * Added support for Intel Goldmont CPUs. |
| |
| * Add support for avx512vpopcntdq instructions. |
| |
| * Added heuristics to convert CMOV into branches when it may be profitable. |
| |
| * More aggressive inlining of memcmp calls. |
| |
| * Improve vXi64 shuffles on 32-bit targets. |
| |
| * Improved use of PMOVMSKB for any_of/all_of comparision reductions. |
| |
| * Improved Silvermont, Sandybridge, and Jaguar (btver2) schedulers. |
| |
| * Improved support for AVX512 vector rotations. |
| |
| * Added support for AMD Lightweight Profiling (LWP) instructions. |
| |
| Changes to the AMDGPU Target |
| ----------------------------- |
| |
| * Initial gfx9 support |
| |
| Changes to the AVR Target |
| ----------------------------- |
| |
| During this release ... |
| |
| Changes to the OCaml bindings |
| ----------------------------- |
| |
| During this release ... |
| |
| |
| Changes to the C API |
| -------------------- |
| |
| * Deprecated the ``LLVMAddBBVectorizePass`` interface since the ``BBVectorize`` |
| pass has been removed. It is now a no-op and will be removed in the next |
| release. Use ``LLVMAddSLPVectorizePass`` instead to get the supported SLP |
| vectorizer. |
| |
| |
| External Open Source Projects Using LLVM 5 |
| ========================================== |
| |
| * A project... |
| |
| |
| Additional Information |
| ====================== |
| |
| A wide variety of additional information is available on the `LLVM web page |
| <http://llvm.org/>`_, in particular in the `documentation |
| <http://llvm.org/docs/>`_ section. The web page also contains versions of the |
| API documentation which is up-to-date with the Subversion 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 <http://llvm.org/docs/#maillist>`_. |
