======================== LLVM 7.0.0 Release Notes ======================== .. contents:: :local: .. warning:: These are in-progress notes for the upcoming LLVM 7 release. Release notes for previous releases can be found on `the Download Page `_. Introduction ============ This document contains the release notes for the LLVM Compiler Infrastructure, release 7.0.0. 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 `_. For more information about LLVM, including information about the latest release, please check out the `main LLVM web site `_. If you have questions or comments, the `LLVM Developer's Mailing List `_ 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 `_. 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. * Libraries have been renamed from 7.0 to 7. This change also impacts downstream libraries like lldb. * The LoopInstSimplify pass (-loop-instsimplify) has been removed. * Symbols starting with ``?`` are no longer mangled by LLVM when using the Windows ``x`` or ``w`` IR mangling schemes. * A new tool named :doc:`llvm-exegesis ` has been added. :program:`llvm-exegesis` automatically measures instruction scheduling properties (latency/uops) and provides a principled way to edit scheduling models. * A new tool named :doc:`llvm-mca ` has been added. :program:`llvm-mca` is a static performance analysis tool that uses information available in LLVM to statically predict the performance of machine code for a specific CPU. * The optimization flag to merge constants (-fmerge-all-constants) is no longer applied by default. * Note.. .. 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 signatures for the builtins @llvm.memcpy, @llvm.memmove, and @llvm.memset have changed. Alignment is no longer an argument, and are instead conveyed as parameter attributes. 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 ------------------------- During this release ... Changes to the AMDGPU Target ----------------------------- During this release ... Changes to the AVR Target ----------------------------- During this release ... Changes to the OCaml bindings ----------------------------- During this release ... Changes to the C API -------------------- During this release ... External Open Source Projects Using LLVM 7 ========================================== * A project... Additional Information ====================== A wide variety of additional information is available on the `LLVM web page `_, in particular in the `documentation `_ 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 `_.