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ReleaseNotes.rst: bump version to 3.7
The 3.6 notes are now in the 3.6 branch. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@226007 91177308-0d34-0410-b5e6-96231b3b80d8
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Hans Wennborg
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======================
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LLVM 3.6 Release Notes
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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 3.6 release. You may
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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 3.5 Release Notes <http://llvm.org/releases/3.5.0/docs
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/ReleaseNotes.html>`_.
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@ -15,7 +15,7 @@ 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 3.6. Here we describe the status of LLVM, including major improvements
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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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@ -41,11 +41,6 @@ Non-comprehensive list of changes in this release
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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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* Support for AuroraUX has been removed.
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* Added support for a `native object file-based bitcode wrapper format
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<BitCodeFormat.html#native-object-file>`_.
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* ... next change ...
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.. NOTE
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@ -58,50 +53,6 @@ Non-comprehensive list of changes in this release
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Makes programs 10x faster by doing Special New Thing.
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Prefix data rework
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------------------
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The semantics of the ``prefix`` attribute have been changed. Users
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that want the previous ``prefix`` semantics should instead use
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``prologue``. To motivate this change, let's examine the primary
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usecases that these attributes aim to serve,
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1. Code sanitization metadata (e.g. Clang's undefined behavior
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sanitizer)
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2. Function hot-patching: Enable the user to insert ``nop`` operations
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at the beginning of the function which can later be safely replaced
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with a call to some instrumentation facility.
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3. Language runtime metadata: Allow a compiler to insert data for
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use by the runtime during execution. GHC is one example of a
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compiler that needs this functionality for its
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tables-next-to-code functionality.
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Previously ``prefix`` served cases (1) and (2) quite well by allowing the user
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to introduce arbitrary data at the entrypoint but before the function
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body. Case (3), however, was poorly handled by this approach as it
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required that prefix data was valid executable code.
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In this release the concept of prefix data has been redefined to be
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data which occurs immediately before the function entrypoint (i.e. the
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symbol address). Since prefix data now occurs before the function
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entrypoint, there is no need for the data to be valid code.
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The previous notion of prefix data now goes under the name "prologue
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data" to emphasize its duality with the function epilogue.
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The intention here is to handle cases (1) and (2) with prologue data and
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case (3) with prefix data. See the language reference for further details
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on the semantics of these attributes.
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This refactoring arose out of discussions_ with Reid Kleckner in
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response to a proposal to introduce the notion of symbol offsets to
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enable handling of case (3).
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.. _discussions: http://lists.cs.uiuc.edu/pipermail/llvmdev/2014-May/073235.html
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Changes to the ARM Backend
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--------------------------
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@ -111,131 +62,27 @@ Changes to the ARM Backend
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Changes to the MIPS Target
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--------------------------
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During this release the MIPS target has reached a few major milestones. The
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compiler has gained support for MIPS-II and MIPS-III; become ABI-compatible
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with GCC for big and little endian O32, N32, and N64; and is now able to
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compile the Linux kernel for 32-bit targets. Additionally, LLD now supports
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microMIPS for the O32 ABI on little endian targets.
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During this release ...
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ABI
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^^^
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A large number of bugs have been fixed for big-endian MIPS targets using the
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N32 and N64 ABI's as well as a small number of bugs affecting other ABI's.
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Please note that some of these bugs will still affect LLVM-IR generated by
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LLVM 3.5 since correct code generation depends on appropriate usage of the
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``inreg``, ``signext``, and ``zeroext`` attributes on all function arguments
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and returns.
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There are far too many corrections to provide a complete list but here are a
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few notable ones:
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* Big-endian N32 and N64 now interlinks successfully with GCC compiled code.
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Previously this didn't work for the majority of cases.
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* The registers used to return a structure containing a single 128-bit floating
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point member on the N32/N64 ABI's have been changed from those specified by
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the ABI documentation to match those used by GCC. The documentation specifies
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that ``$f0`` and ``$f2`` should be used but GCC has used ``$f0`` and ``$f1``
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for many years.
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* Returning a zero-byte struct no longer causes arguments to be read from the
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wrong registers when using the O32 ABI.
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* The exception personality has been changed for 64-bit MIPS targets to
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eliminate warnings about relocations in a read-only section.
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* Incorrect usage of odd-numbered single-precision floating point registers
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has been fixed when the fastcc calling convention is used with 64-bit FPU's
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and -mno-odd-spreg.
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LLVMLinux
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^^^^^^^^^
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It is now possible to compile the Linux kernel. This currently requires a small
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number of kernel patches. See the `LLVMLinux project
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<http://llvm.linuxfoundation.org/index.php/Main_Page>`_ for details.
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* Added -mabicalls and -mno-abicalls. The implementation may not be complete
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but works sufficiently well for the Linux kernel.
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* Fixed multiple compatibility issues between LLVM's inline assembly support
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and GCC's.
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* Added support for a number of directives used by Linux to the Integrated
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Assembler.
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Miscellaneous
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^^^^^^^^^^^^^
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* Attempting to disassemble l[wd]c[23], s[wd]c[23], cache, and pref no longer
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triggers an assertion.
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* Added -muclibc and -mglibc to support toolchains that provide both uClibC and
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GLibC.
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* __SIZEOF_INT128__ is no longer defined for 64-bit targets since 128-bit
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integers do not work at this time for this target.
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* Using $t4-$t7 with the N32 and N64 ABI is deprecated when ``-fintegrated-as``
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is in use and will be removed in LLVM 3.7. These names have never been
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supported by the GNU Assembler for these ABI's.
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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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During this release ...
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* LLVM now generates the Vector-Scalar eXtension (VSX) instructions from
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version 2.06 of the Power ISA, for both big- and little-endian targets.
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* LLVM now has a POWER8 instruction scheduling description.
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* Address Sanitizer (ASAN) support is now fully functional.
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* Performance of simple atomic accesses has been greatly improved.
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* Atomic fences now use light-weight syncs where possible, again providing
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significant performance benefit.
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* The PowerPC target now supports PIC levels (-fPIC vs. -fpic).
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* PPC32 SVR4 now supports small-model PIC.
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* There have been many smaller bug fixes and performance improvements.
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Changes to the OCaml bindings
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-----------------------------
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* The bindings now require OCaml >=4.00.0, ocamlfind,
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ctypes >=0.3.0 <0.4 and OUnit 2 if tests are enabled.
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During this release ...
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* The bindings can now be built using cmake as well as autoconf.
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* LLVM 3.5 has, unfortunately, shipped a broken Llvm_executionengine
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implementation. In LLVM 3.6, the bindings now fully support MCJIT,
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however the interface is reworked from scratch using ctypes
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and is not backwards compatible.
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* Llvm_linker.Mode was removed following the changes in LLVM.
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This breaks the interface of Llvm_linker.
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* All combinations of ocamlc/ocamlc -custom/ocamlopt and shared/static
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builds of LLVM are now supported.
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* Absolute paths are not embedded into the OCaml libraries anymore.
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Either OCaml >=4.02.2 must be used, which includes an rpath-like $ORIGIN
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mechanism, or META file must be updated for out-of-tree installations;
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see r221139.
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* As usual, many more functions have been exposed to OCaml.
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External Open Source Projects Using LLVM 3.6
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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 3.6.
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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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