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======================
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LLVM 3.7 Release Notes
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======================
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.. contents::
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:local:
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.. warning::
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These are in-progress notes for the upcoming LLVM 3.7 release. You may
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prefer the `LLVM 3.6 Release Notes <http://llvm.org/releases/3.6.0/docs
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/ReleaseNotes.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 3.7. 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 <http://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 <http://llvm.org/>`_. If you
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have questions or comments, the `LLVM Developer's Mailing List
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<http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev>`_ is a good place to send
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them.
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Note that if you are reading this file from a Subversion 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 <http://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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* The minimum required Visual Studio version for building LLVM is now 2013
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Update 4.
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* A new documentation page, :doc:`Frontend/PerformanceTips`, contains a
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collection of tips for frontend authors on how to generate IR which LLVM is
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able to effectively optimize.
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* The DataLayout is no longer optional. All the IR level optimizations expects
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it to be present and the API has been changed to use a reference instead of
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a pointer to make it explicit. The Module owns the datalayout and it has to
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match the one attached to the TargetMachine for generating code.
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* Comdats are now ortogonal to the linkage. LLVM will not create
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comdats for weak linkage globals and the frontends are responsible
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for explicitly adding them.
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* On ELF we now support multiple sections with the same name and
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comdat. This allows for smaller object files since multiple
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sections can have a simple name (`.text`, `.rodata`, etc).
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* LLVM now lazily loads metadata in some cases. Creating archives
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with IR files with debug info is now 25X faster.
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* llvm-ar can create archives in the BSD format used by OS X.
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* ... next change ...
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.. NOTE
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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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and un-indent it (the indentation causes it to be inside this comment).
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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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Changes to the ARM Backend
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--------------------------
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During this release ...
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Changes to the MIPS Target
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--------------------------
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During this release the MIPS target has:
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* Added support for MIPS32R3, MIPS32R5, MIPS32R3, MIPS32R5, and microMIPS32.
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* Added support for dynamic stack realignment. This of particular importance to
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MSA on 32-bit subtargets since vectors always exceed the stack alignment on
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the O32 ABI.
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* Added support for compiler-rt including:
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* Support for the Address, and Undefined Behaviour Sanitizers for all MIPS
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subtargets.
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* Support for the Data Flow, and Memory Sanitizer for 64-bit subtargets.
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* Support for the Profiler for all MIPS subtargets.
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* Added support for libcxx, and libcxxabi.
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* Improved inline assembly support such that memory constraints may now make use
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of the appropriate address offsets available to the instructions. Also, added
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support for the ``ZC`` constraint.
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* Added support for 128-bit integers on 64-bit subtargets and 16-bit floating
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point conversions on all subtargets.
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* Added support for read-only ``.eh_frame`` sections by storing type information
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indirectly.
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* Added support for MCJIT on all 64-bit subtargets as well as MIPS32R6.
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* Various bug fixes. Including the following notable fixes:
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* Fixed 'jumpy' debug line info around calls where calculation of the address
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of the function would inappropriately change the line number.
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* Fixed missing ``__mips_isa_rev`` macro on the MIPS32R6 and MIPS32R6
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subtargets.
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* Fixed representation of NaN when targeting systems using traditional
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encodings. Traditionally, MIPS has used NaN encodings that were compatible
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with IEEE754-1985 but would later be found incompatible with IEEE754-2008.
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* Fixed multiple segfaults and assertions in the disassembler when
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disassembling instructions that have memory operands.
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* Fixed multiple cases of suboptimal code generation involving $zero.
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* Fixed code generation of 128-bit shifts on 64-bit subtargets.
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* Prevented the delay slot filler from filling call delay slots with
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instructions that modify or use $ra.
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* Fixed some remaining N32/N64 calling convention bugs when using small
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structures on big-endian subtargets.
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* Fixed missing sign-extensions that are required by the N32/N64 calling
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convention when generating calls to library functions with 32-bit
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parameters.
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* Corrected the ``int64_t`` typedef to be ``long`` for N64.
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* ``-mno-odd-spreg`` is now honoured for vector insertion/extraction
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operations when using -mmsa.
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* Fixed vector insertion and extraction for MSA on 64-bit subtargets.
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* Corrected the representation of member function pointers. This makes them
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usable on microMIPS subtargets.
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Changes to the PowerPC Target
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-----------------------------
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There are numerous improvements to the PowerPC target in this release:
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* LLVM now supports the ISA 2.07B (POWER8) instruction set, including
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direct moves between general registers and vector registers, and
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built-in support for hardware transactional memory (HTM). Some missing
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instructions from ISA 2.06 (POWER7) were also added.
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* Code generation for the local-dynamic and global-dynamic thread-local
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storage models has been improved.
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* Loops may be restructured to leverage pre-increment loads and stores.
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* QPX - Hal, please say a few words.
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* Loads from the TOC area are now correctly treated as invariant.
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* PowerPC now has support for i128 and v1i128 types. The types differ
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in how they are passed in registers for the ELFv2 ABI.
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* Disassembly will now print shorter mnemonic aliases when available.
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* Optional register name prefixes for VSX and QPX registers are now
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supported in the assembly parser.
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* The back end now contains a pass to remove unnecessary vector swaps
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from POWER8 little-endian code generation. Additional improvements
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are planned for release 3.8.
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* The undefined-behavior sanitizer (UBSan) is now supported for PowerPC.
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* Many new vector programming APIs have been added to altivec.h.
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Additional ones are planned for release 3.8.
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* PowerPC now supports __builtin_call_with_static_chain.
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* PowerPC now supports the revised -mrecip option that permits finer
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control over reciprocal estimates.
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* Many bugs have been identified and fixed.
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Changes to the OCaml bindings
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-----------------------------
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During this release ...
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External Open Source Projects Using LLVM 3.7
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============================================
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An exciting aspect of LLVM is that it is used as an enabling technology for
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a lot of other language and tools projects. This section lists some of the
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projects that have already been updated to work with LLVM 3.7.
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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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<http://llvm.org/>`_, in particular in the `documentation
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<http://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 Subversion 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 `mailing lists <http://llvm.org/docs/#maillist>`_.
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