<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<link rel="stylesheet" href="llvm.css" type="text/css">
- <title>LLVM 3.0 Release Notes</title>
+ <title>LLVM 3.1 Release Notes</title>
</head>
<body>
-<h1>LLVM 3.0 Release Notes</h1>
+<h1>LLVM 3.1 Release Notes</h1>
-<img align=right src="http://llvm.org/img/DragonSmall.png"
- width="136" height="136" alt="LLVM Dragon Logo">
+<div>
+<img style="float:right" src="http://llvm.org/img/DragonSmall.png"
+ width="136" height="136" alt="LLVM Dragon Logo">
+</div>
<ol>
<li><a href="#intro">Introduction</a></li>
<li><a href="#subproj">Sub-project Status Update</a></li>
- <li><a href="#externalproj">External Projects Using LLVM 3.0</a></li>
- <li><a href="#whatsnew">What's New in LLVM 3.0?</a></li>
+ <li><a href="#externalproj">External Projects Using LLVM 3.1</a></li>
+ <li><a href="#whatsnew">What's New in LLVM?</a></li>
<li><a href="GettingStarted.html">Installation Instructions</a></li>
<li><a href="#knownproblems">Known Problems</a></li>
<li><a href="#additionalinfo">Additional Information</a></li>
<p>Written by the <a href="http://llvm.org/">LLVM Team</a></p>
</div>
-<!--
-<h1 style="color:red">These are in-progress notes for the upcoming LLVM 3.0
+<h1 style="color:red">These are in-progress notes for the upcoming LLVM 3.1
release.<br>
You may prefer the
-<a href="http://llvm.org/releases/2.9/docs/ReleaseNotes.html">LLVM 2.9
+<a href="http://llvm.org/releases/3.0/docs/ReleaseNotes.html">LLVM 3.0
Release Notes</a>.</h1>
- -->
<!-- *********************************************************************** -->
<h2>
<div>
<p>This document contains the release notes for the LLVM Compiler
-Infrastructure, release 3.0. Here we describe the status of LLVM, including
-major improvements from the previous release and significant known problems.
-All LLVM releases may be downloaded from the <a
-href="http://llvm.org/releases/">LLVM releases web site</a>.</p>
+ Infrastructure, release 3.1. 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 <a href="http://llvm.org/releases/">LLVM releases web site</a>.</p>
<p>For more information about LLVM, including information about the latest
-release, please check out the <a href="http://llvm.org/">main LLVM
-web site</a>. If you have questions or comments, the <a
-href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVM Developer's
-Mailing List</a> is a good place to send them.</p>
+ release, please check out the <a href="http://llvm.org/">main LLVM web
+ site</a>. If you have questions or comments,
+ the <a href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVM
+ Developer's Mailing List</a> is a good place to send them.</p>
-<p>Note that if you are reading this file from a Subversion checkout or the
-main LLVM web page, this document applies to the <i>next</i> release, not the
-current one. To see the release notes for a specific release, please see the
-<a href="http://llvm.org/releases/">releases page</a>.</p>
+<p>Note that if you are reading this file from a Subversion checkout or the main
+ LLVM web page, this document applies to the <i>next</i> release, not the
+ current one. To see the release notes for a specific release, please see the
+
<a href="http://llvm.org/releases/">releases page</a>.</p>
</div>
-
-<!-- Features that need text if they're finished for 3.1:
- ARM EHABI
- combiner-aa?
- strong phi elim
- loop dependence analysis
- CorrelatedValuePropagation
- lib/Transforms/IPO/MergeFunctions.cpp => consider for 3.1.
- -->
-
+
+
<!-- *********************************************************************** -->
<h2>
<a name="subproj">Sub-project Status Update</a>
<!-- *********************************************************************** -->
<div>
-<p>
-The LLVM 3.0 distribution currently consists of code from the core LLVM
-repository (which roughly includes the LLVM optimizers, code generators
-and supporting tools), the Clang repository and the llvm-gcc repository. In
-addition to this code, the LLVM Project includes other sub-projects that are in
-development. Here we include updates on these subprojects.
-</p>
+
+<p>The LLVM 3.1 distribution currently consists of code from the core LLVM
+ repository (which roughly includes the LLVM optimizers, code generators and
+ supporting tools), and the Clang repository. In
+ addition to this code, the LLVM Project includes other sub-projects that are
+ in development. Here we include updates on these subprojects.</p>
<!--=========================================================================-->
<h3>
<div>
<p><a href="http://clang.llvm.org/">Clang</a> is an LLVM front end for the C,
-C++, and Objective-C languages. Clang aims to provide a better user experience
-through expressive diagnostics, a high level of conformance to language
-standards, fast compilation, and low memory use. Like LLVM, Clang provides a
-modular, library-based architecture that makes it suitable for creating or
-integrating with other development tools. Clang is considered a
-production-quality compiler for C, Objective-C, C++ and Objective-C++ on x86
-(32- and 64-bit), and for darwin/arm targets.</p>
-
-<p>In the LLVM 3.0 time-frame, the Clang team has made many improvements:</p>
-
+ C++, and Objective-C languages. Clang aims to provide a better user
+ experience through expressive diagnostics, a high level of conformance to
+ language standards, fast compilation, and low memory use. Like LLVM, Clang
+ provides a modular, library-based architecture that makes it suitable for
+ creating or integrating with other development tools. Clang is considered a
+ production-quality compiler for C, Objective-C, C++ and Objective-C++ on x86
+ (32- and 64-bit), and for Darwin/ARM targets.</p>
+
+<p>In the LLVM 3.1 time-frame, the Clang team has made many improvements:</p>
<ul>
- <li>Greatly improved support for building C++ applications, with greater stability and better diagnostics.</li>
-
- <li><a href="http://clang.llvm.org/cxx_status.html">Improved support</a> for the <a href="http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=50372 ">C++ 2011</a> standard, including implementations of non-static data member initializers, alias templates, delegating constructors, the range-based for loop, and implicitly-generated move constructors and move assignment operators, among others.</li>
-
- <li>Implemented support for some features of the upcoming C1x standard, including static assertions and generic selections.</li>
-
- <li>Better detection of include and linking paths for system headers and libraries, especially for Linux distributions.</li>
+ <li>...</li>
+</ul>
- <li>Implemented support for <a href="http://clang.llvm.org/docs/AutomaticReferenceCounting.html">Automatic Reference Counting</a> for Objective-C.</li>
+ <p>For more details about the changes to Clang since the 2.9 release, see the
+<a href="http://clang.llvm.org/docs/ReleaseNotes.html">Clang release notes</a>
+</p>
- <li>Implemented a number of optimizations in <tt>libclang</tt>, the Clang C interface, to improve the performance of code completion and the mapping from source locations to abstract syntax tree nodes.</li>
-</ul>
-
<p>If Clang rejects your code but another compiler accepts it, please take a
-look at the <a href="http://clang.llvm.org/compatibility.html">language
-compatibility</a> guide to make sure this is not intentional or a known issue.
-</p>
+
look at the <a href="http://clang.llvm.org/compatibility.html">language
+ compatibility</a> guide to make sure this is not intentional or a known
+ issue.</p>
</div>
</h3>
<div>
-<p>
-<a href="http://dragonegg.llvm.org/">DragonEgg</a> is a
-<a href="http://gcc.gnu.org/wiki/plugins">gcc plugin</a> that replaces GCC's
-optimizers and code generators with LLVM's.
-Currently it requires a patched version of gcc-4.5.
-The plugin can target the x86-32 and x86-64 processor families and has been
-used successfully on the Darwin, FreeBSD and Linux platforms.
-The Ada, C, C++ and Fortran languages work well.
-The plugin is capable of compiling plenty of Obj-C, Obj-C++ and Java but it is
-not known whether the compiled code actually works or not!
-</p>
+<p><a href="http://dragonegg.llvm.org/">DragonEgg</a> is a
+ <a href="http://gcc.gnu.org/wiki/plugins">gcc plugin</a> that replaces GCC's
+ optimizers and code generators with LLVM's. It works with gcc-4.5 or gcc-4.6,
+ targets the x86-32 and x86-64 processor families, and has been successfully
+ used on the Darwin, FreeBSD, KFreeBSD, Linux and OpenBSD platforms. It fully
+ supports Ada, C, C++ and Fortran. It has partial support for Go, Java, Obj-C
+ and Obj-C++.</p>
+
+<p>The 3.1 release has the following notable changes:</p>
+
+ <ul>
+
+ <li>...</li>
-<p>
-The 3.0 release has the following notable changes:
-<ul>
-<!--
-<li></li>
--->
</ul>
</div>
</h3>
<div>
-<p>
-The new LLVM <a href="http://compiler-rt.llvm.org/">compiler-rt project</a>
-is a simple library that provides an implementation of the low-level
-target-specific hooks required by code generation and other runtime components.
-For example, when compiling for a 32-bit target, converting a double to a 64-bit
-unsigned integer is compiled into a runtime call to the "__fixunsdfdi"
-function. The compiler-rt library provides highly optimized implementations of
-this and other low-level routines (some are 3x faster than the equivalent
-libgcc routines).</p>
-
-<p>In the LLVM 3.0 timeframe,</p>
+
+
<p>The new LLVM <a href="http://compiler-rt.llvm.org/">compiler-rt project</a>
+ is a simple library that provides an implementation of the low-level
+ target-specific hooks required by code generation and other runtime
+ components. For example, when compiling for a 32-bit target, converting a
+ double to a 64-bit unsigned integer is compiled into a runtime call to the
+ "__fixunsdfdi" function. The compiler-rt library provides highly optimized
+ implementations of this and other low-level routines (some are 3x faster than
+ the equivalent libgcc routines).</p>
+
+<p>....</p>
</div>
</h3>
<div>
-<p>
-<a href="http://lldb.llvm.org/">LLDB</a> is a brand new member of the LLVM
-umbrella of projects. LLDB is a next generation, high-performance debugger. It
-is built as a set of reusable components which highly leverage existing
-libraries in the larger LLVM Project, such as the Clang expression parser, the
-LLVM disassembler and the LLVM JIT.</p>
-
-<p>
-LLDB is has advanced by leaps and bounds in the 3.0 timeframe. It is
-dramatically more stable and useful, and includes both a new <a
-href="http://lldb.llvm.org/tutorial.html">tutorial</a> and a <a
-href="http://lldb.llvm.org/lldb-gdb.html">side-by-side comparison with
-GDB</a>.</p>
+
+<p>LLDB is a ground-up implementation of a command line debugger, as well as a
+ debugger API that can be used from other applications. LLDB makes use of the
+ Clang parser to provide high-fidelity expression parsing (particularly for
+ C++) and uses the LLVM JIT for target support.</p>
+
+<p>...</p>
</div>
</h3>
<div>
-<p>
-<a href="http://libcxx.llvm.org/">libc++</a> is another new member of the LLVM
-family. It is an implementation of the C++ standard library, written from the
-ground up to specifically target the forthcoming C++'0X standard and focus on
-delivering great performance.</p>
-
-<p>
-In the LLVM 3.0 timeframe,</p>
-
-<p>
-Like compiler_rt, libc++ is now <a href="DeveloperPolicy.html#license">dual
- licensed</a> under the MIT and UIUC license, allowing it to be used more
- permissively.
-</p>
-
-</div>
+<p>Like compiler_rt, libc++ is now <a href="DeveloperPolicy.html#license">dual
+ licensed</a> under the MIT and UIUC license, allowing it to be used more
+ permissively.</p>
-<!--=========================================================================-->
-<h3>
-<a name="LLBrowse">LLBrowse: IR Browser</a>
-</h3>
+<p>...</p>
-<div>
-<p>
-<a href="http://llvm.org/svn/llvm-project/llbrowse/trunk/doc/LLBrowse.html">
- LLBrowse</a> is an interactive viewer for LLVM modules. It can load any LLVM
- module and displays its contents as an expandable tree view, facilitating an
- easy way to inspect types, functions, global variables, or metadata nodes. It
- is fully cross-platform, being based on the popular wxWidgets GUI toolkit.
-</p>
</div>
<!--=========================================================================-->
</h3>
<div>
-<p>The <a href="http://vmkit.llvm.org/">VMKit project</a> is an implementation
- of a Java Virtual Machine (Java VM or JVM) that uses LLVM for static and
- just-in-time compilation. As of LLVM 3.0, VMKit now supports generational
- garbage collectors. The garbage collectors are provided by the MMTk framework,
- and VMKit can be configured to use one of the numerous implemented collectors
- of MMTk.
-</p>
-</div>
-
-
-<!--=========================================================================-->
-<!--
-<h3>
-<a name="klee">KLEE: A Symbolic Execution Virtual Machine</a>
-</h3>
-<div>
-<p>
-<a href="http://klee.llvm.org/">KLEE</a> is a symbolic execution framework for
-programs in LLVM bitcode form. KLEE tries to symbolically evaluate "all" paths
-through the application and records state transitions that lead to fault
-states. This allows it to construct testcases that lead to faults and can even
-be used to verify some algorithms.
-</p>
+ <p>The <a href="http://vmkit.llvm.org/">VMKit project</a> is an
+ implementation of a Java Virtual Machine (Java VM or JVM) that uses LLVM for
+ static and just-in-time compilation.
+
+ <p>In the LLVM 3.1 time-frame, VMKit has had significant improvements on both
+ runtime and startup performance:</p>
-<p>UPDATE!</p>
-</div>-->
+ <ul>
+ <li>...</li>
+ </ul>
+
+</div>
</div>
<!-- *********************************************************************** -->
<h2>
- <a name="externalproj">External Open Source Projects Using LLVM 3.0</a>
+ <a name="externalproj">External Open Source Projects Using LLVM 3.1</a>
</h2>
<!-- *********************************************************************** -->
<p>An exciting aspect of LLVM is that it is used as an enabling technology for
a lot of other language and tools projects. This section lists some of the
- projects that have already been updated to work with LLVM 3.0.</p>
-
-<!--=========================================================================-->
-<h3>AddressSanitizer</h3>
-
-<div>
-
-<p><a href="http://code.google.com/p/address-sanitizer/">AddressSanitizer</a>
- uses compiler instrumentation and a specialized malloc library to find C/C++
- bugs such as use-after-free and out-of-bound accesses to heap, stack, and
- globals. The key feature of the tool is speed: the average slowdown
- introduced by AddressSanitizer is less than 2x.</p>
-
-</div>
-
-<!--=========================================================================-->
-<h3>ClamAV</h3>
-
-<div>
-
-<p><a href="http://www.clamav.net">Clam AntiVirus</a> is an open source (GPL)
- anti-virus toolkit for UNIX, designed especially for e-mail scanning on mail
- gateways.</p>
-
-<p>Since version 0.96 it
- has <a href="http://vrt-sourcefire.blogspot.com/2010/09/introduction-to-clamavs-low-level.html">bytecode
- signatures</a> that allow writing detections for complex malware.</p>
-
-<p>It uses LLVM's JIT to speed up the execution of bytecode on X86, X86-64,
- PPC32/64, falling back to its own interpreter otherwise. The git version was
- updated to work with LLVM 3.0.</p>
-
-</div>
-
-<!--=========================================================================-->
-<h3>clReflect</h3>
-
-<div>
-
-<p><a href="https://bitbucket.org/dwilliamson/clreflect">clReflect</a> is a C++
- parser that uses clang/LLVM to derive a light-weight reflection database
- suitable for use in game development. It comes with a very simple runtime
- library for loading and querying the database, requiring no external
- dependencies (including CRT), and an additional utility library for object
- management and serialisation.</p>
-
-</div>
-
-<!--=========================================================================-->
-<!-- FIXME: Comment out
-<h3>Crack Programming Language</h3>
-
-<div>
-<p>
-<a href="http://code.google.com/p/crack-language/">Crack</a> aims to provide the
-ease of development of a scripting language with the performance of a compiled
-language. The language derives concepts from C++, Java and Python, incorporating
-object-oriented programming, operator overloading and strong typing.</p>
-</div>
--->
-
-<!--=========================================================================-->
-<h3>Glasgow Haskell Compiler (GHC)</h3>
-
-<div>
-
-<p>GHC is an open source, state-of-the-art programming suite for Haskell, a
- standard lazy functional programming language. It includes an optimizing
- static compiler generating good code for a variety of platforms, together
- with an interactive system for convenient, quick development.</p>
-
-<p>GHC 7.0 and onwards include an LLVM code generator, supporting LLVM 2.8 and
- later. Since LLVM 2.9, GHC now includes experimental support for the ARM
- platform with LLVM 3.0.</p>
-
-</div>
-
-<!--=========================================================================-->
-<h3>gwXscript</h3>
-
-<div>
-
-<p><a href="http://botwars.tk/gwscript/">gwXscript</a> is an object oriented,
- aspect oriented programming language which can create both executables (ELF,
- EXE) and shared libraries (DLL, SO, DYNLIB). The compiler is implemented in
- its own language and translates scripts into LLVM-IR which can be optimized
- and translated into native code by the LLVM framework. Source code in
- gwScript contains definitions that expand the namespaces. So you can build
- your project and simply 'plug out' features by removing a file. The remaining
- project does not leave scars since you directly separate concerns by the
- 'template' feature of gwX. It is also possible to add new features to a
- project by just adding files and without editing the original project. This
- language is used for example to create games or content management systems
- that should be extendable.</p>
-
-<p>gwXscript is strongly typed and offers comfort with its native types string,
- hash and array. You can easily write new libraries in gwXscript or native
- code. gwXscript is type safe and users should not be able to crash your
- program or execute malicious code except code that is eating CPU time.</p>
-
-</div>
-
-<!--=========================================================================-->
-<h3>LanguageKit and Pragmatic Smalltalk</h3>
-
-<div>
-
-<p><a href="http://etoileos.com/etoile/features/languagekit/">LanguageKit</a> is
- a framework for implementing dynamic languages sharing an object model with
- Objective-C. It provides static and JIT compilation using LLVM along with
- its own interpreter. Pragmatic Smalltalk is a dialect of Smalltalk, built on
- top of LanguageKit, that interfaces directly with Objective-C, sharing the
- same object representation and message sending behaviour. These projects are
- developed as part of the Étoié desktop environment.</p>
-
-</div>
-
-<!--=========================================================================-->
-<h3>Mono</h3>
-
-<div>
-
-<p>An open source, cross-platform implementation of C# and the CLR that is
- binary compatible with Microsoft.NET. Has an optional, dynamically-loaded
- LLVM code generation backend in Mini, the JIT compiler.</p>
-
-<p>Note that we use a Git mirror of LLVM with some patches. See:
- https://github.com/mono/llvm</p>
-
-</div>
-
-<!--=========================================================================-->
-<h3>Portable OpenCL (pocl)</h3>
-
-<div>
-
-<p>Portable OpenCL is an open source implementation of the OpenCL standard which
- can be easily adapted for new targets. One of the goals of the project is
- improving performance portability of OpenCL programs, avoiding the need for
- target-dependent manual optimizations. A "native" target is included, which
- allows running OpenCL kernels on the host (CPU).</p>
-
-</div>
-
-<!--=========================================================================-->
-<h3>Pure</h3>
-
-<div>
-<p><a href="http://pure-lang.googlecode.com/">Pure</a> is an
- algebraic/functional programming language based on term rewriting. Programs
- are collections of equations which are used to evaluate expressions in a
- symbolic fashion. The interpreter uses LLVM as a backend to JIT-compile Pure
- programs to fast native code. Pure offers dynamic typing, eager and lazy
- evaluation, lexical closures, a hygienic macro system (also based on term
- rewriting), built-in list and matrix support (including list and matrix
- comprehensions) and an easy-to-use interface to C and other programming
- languages (including the ability to load LLVM bitcode modules, and inline C,
- C++, Fortran and Faust code in Pure programs if the corresponding LLVM-enabled
- compilers are installed).</p>
-
-<p>Pure version 0.48 has been tested and is known to work with LLVM 3.0
- (and continues to work with older LLVM releases >= 2.5).</p>
-
-</div>
-
-<!--=========================================================================-->
-<h3>Renderscript</h3>
-
-<div>
-
-<p><a href="http://developer.android.com/guide/topics/renderscript/index.html">Renderscript</a>
- is Android's advanced 3D graphics rendering and compute API. It provides a
- portable C99-based language with extensions to facilitate common use cases
- for enhancing graphics and thread level parallelism. The Renderscript
- compiler frontend is based on Clang/LLVM. It emits a portable bitcode format
- for the actual compiled script code, as well as reflects a Java interface for
- developers to control the execution of the compiled bitcode. Executable
- machine code is then generated from this bitcode by an LLVM backend on the
- device. Renderscript is thus able to provide a mechanism by which Android
- developers can improve performance of their applications while retaining
- portability.</p>
-
-</div>
-
-<!--=========================================================================-->
-<h3>SAFECode</h3>
-
-<div>
-
-<p><a href="http://safecode.cs.illinois.edu">SAFECode</a> is a memory safe C/C++
- compiler built using LLVM. It takes standard, unannotated C/C++ code,
- analyzes the code to ensure that memory accesses and array indexing
- operations are safe, and instruments the code with run-time checks when
- safety cannot be proven statically. SAFECode can be used as a debugging aid
- (like Valgrind) to find and repair memory safety bugs. It can also be used
- to protect code from security attacks at run-time.</p>
-
-</div>
-
-<!--=========================================================================-->
-<h3>The Stupid D Compiler (SDC)</h3>
-
-<div>
-
-<p><a href="https://github.com/bhelyer/SDC">The Stupid D Compiler</a> is a
- project seeking to write a self-hosting compiler for the D programming
- language without using the frontend of the reference compiler (DMD).</p>
-
-</div>
-
-<!--=========================================================================-->
-<h3>TTA-based Co-design Environment (TCE)</h3>
-
-<div>
-
-<p>TCE is a toolset for designing application-specific processors (ASP) based on
- the Transport triggered architecture (TTA). The toolset provides a complete
- co-design flow from C/C++ programs down to synthesizable VHDL and parallel
- program binaries. Processor customization points include the register files,
- function units, supported operations, and the interconnection network.</p>
-
-<p>TCE uses Clang and LLVM for C/C++ language support, target independent
- optimizations and also for parts of code generation. It generates new
- LLVM-based code generators <i>on the fly</i> for the designed TTA processors
- and loads them in to the compiler backend as runtime libraries to avoid
- per-target recompilation of larger parts of the compiler chain.</p>
-</div>
-
-
-<!--=========================================================================-->
-<h3>Tart Programming Language</h3>
-
-<div>
-
-<p><a href="http://code.google.com/p/tart/">Tart</a> is a general-purpose,
- strongly typed programming language designed for application
- developers. Strongly inspired by Python and C#, Tart focuses on practical
- solutions for the professional software developer, while avoiding the clutter
- and boilerplate of legacy languages like Java and C++. Although Tart is still
- in development, the current implementation supports many features expected of
- a modern programming language, such as garbage collection, powerful
- bidirectional type inference, a greatly simplified syntax for template
- metaprogramming, closures and function literals, reflection, operator
- overloading, explicit mutability and immutability, and much more. Tart is
- flexible enough to accommodate a broad range of programming styles and
- philosophies, while maintaining a strong commitment to simplicity, minimalism
- and elegance in design.</p>
-
-</div>
-
-<!--=========================================================================-->
-<h3>ThreadSanitizer</h3>
-
-<div>
-
-<p><a href="http://code.google.com/p/data-race-test/">ThreadSanitizer</a> is a
- data race detector for (mostly) C and C++ code, available for Linux, Mac OS
- and Windows. On different systems, we use binary instrumentation frameworks
- (Valgrind, Pin and DynamoRio) as frontends that generate the program events
- for the race detection algorithm. On Linux, there's an option of using
- LLVM-based compile-time instrumentation.</p>
-
-</div>
-
-<!--=========================================================================-->
-<h3>The ZooLib C++ Cross-Platform Application Framework</h3>
-
-<div>
-
-<p><a href="http://www.zoolib.org/">ZooLib</a> is Open Source under the MIT
- License. It provides GUI, filesystem access, TCP networking, thread-safe
- memory management, threading and locking for Mac OS X, Classic Mac OS,
- Microsoft Windows, POSIX operating systems with X11, BeOS, Haiku, Apple's iOS
- and Research in Motion's BlackBerry.</p>
-
-<p>My current work is to use CLang's static analyzer to improve ZooLib's code
- quality. I also plan to set up LLVM compiles of the demo programs and test
- programs using CLang and LLVM on all the platforms that CLang, LLVM and
- ZooLib all support.</p>
-
-</div>
-
-<!--=========================================================================-->
-<!--
-<h3>PinaVM</h3>
-
-<div>
-<p><a href="http://gitorious.org/pinavm/pages/Home">PinaVM</a> is an open
-source, <a href="http://www.systemc.org/">SystemC</a> front-end. Unlike many
-other front-ends, PinaVM actually executes the elaboration of the
-program analyzed using LLVM's JIT infrastructure. It later enriches the
-bitcode with SystemC-specific information.</p>
-</div>
--->
-
-
-<!--=========================================================================-->
-<!--
-<h3 id="icedtea">IcedTea Java Virtual Machine Implementation</h3>
-
-<div>
-<p>
-<a href="http://icedtea.classpath.org/wiki/Main_Page">IcedTea</a> provides a
-harness to build OpenJDK using only free software build tools and to provide
-replacements for the not-yet free parts of OpenJDK. One of the extensions that
-IcedTea provides is a new JIT compiler named <a
-href="http://icedtea.classpath.org/wiki/ZeroSharkFaq">Shark</a> which uses LLVM
-to provide native code generation without introducing processor-dependent
-code.
-</p>
-
-<p> OpenJDK 7 b112, IcedTea6 1.9 and IcedTea7 1.13 and later have been tested
-and are known to work with LLVM 3.0 (and continue to work with older LLVM
-releases >= 2.6 as well).</p>
-</div>
--->
-
-<!--=========================================================================-->
-<!--
-<h3>Polly - Polyhedral optimizations for LLVM</h3>
-
-<div>
-<p>Polly is a project that aims to provide advanced memory access optimizations
-to better take advantage of SIMD units, cache hierarchies, multiple cores or
-even vector accelerators for LLVM. Built around an abstract mathematical
-description based on Z-polyhedra, it provides the infrastructure to develop
-advanced optimizations in LLVM and to connect complex external optimizers. In
-its first year of existence Polly already provides an exact value-based
-dependency analysis as well as basic SIMD and OpenMP code generation support.
-Furthermore, Polly can use PoCC(Pluto) an advanced optimizer for data-locality
-and parallelism.</p>
-</div>
--->
-
-<!--=========================================================================-->
-<!--
-<h3>Rubinius</h3>
-
-<div>
- <p><a href="http://github.com/evanphx/rubinius">Rubinius</a> is an environment
- for running Ruby code which strives to write as much of the implementation in
- Ruby as possible. Combined with a bytecode interpreting VM, it uses LLVM to
- optimize and compile ruby code down to machine code. Techniques such as type
- feedback, method inlining, and deoptimization are all used to remove dynamism
- from ruby execution and increase performance.</p>
-</div>
--->
-
-<!--=========================================================================-->
-<!--
-<h3>
-<a name="FAUST">FAUST Real-Time Audio Signal Processing Language</a>
-</h3>
+ projects that have already been updated to work with LLVM 3.1.</p>
-<div>
-<p>
-<a href="http://faust.grame.fr">FAUST</a> is a compiled language for real-time
-audio signal processing. The name FAUST stands for Functional AUdio STream. Its
-programming model combines two approaches: functional programming and block
-diagram composition. In addition with the C, C++, JAVA output formats, the
-Faust compiler can now generate LLVM bitcode, and works with LLVM 2.7-3.0.</p>
+ ... to be filled in right before the release ...
-</div>
--->
-
</div>
<!-- *********************************************************************** -->
<h2>
- <a name="whatsnew">What's New in LLVM 3.0?</a>
+ <a name="whatsnew">What's New in LLVM 3.1?</a>
</h2>
<!-- *********************************************************************** -->
<div>
<p>This release includes a huge number of bug fixes, performance tweaks and
-minor improvements. Some of the major improvements and new features are listed
-in this section.
-</p>
+ minor improvements. Some of the major improvements and new features are
+ listed in this section.</p>
<!--=========================================================================-->
<h3>
<div>
-<p>LLVM 3.0 includes several major new capabilities:</p>
+ <!-- Features that need text if they're finished for 3.1:
+ ARM EHABI
+ combiner-aa?
+ strong phi elim
+ loop dependence analysis
+ CorrelatedValuePropagation
+ lib/Transforms/IPO/MergeFunctions.cpp => consider for 3.1.
+ Integrated assembler on by default for arm/thumb?
-<ul>
+ -->
+
+ <!-- Near dead:
+ Analysis/RegionInfo.h + Dom Frontiers
+ SparseBitVector: used in LiveVar.
+ llvm/lib/Archive - replace with lib object?
+ -->
+
+<p>LLVM 3.1 includes several major changes and big features:</p>
-<!--
-<li></li>
--->
-
+<ul>
+ <li><a href="../tools/clang/docs/AddressSanitizer.html">AddressSanitizer</a>,
+ a fast memory error detector.</li>
+ <li><a href="CodeGenerator.html#machineinstrbundle">MachineInstr Bundles</a>,
+ Support to model instruction bundling / packing.</li>
+ <li><a href="#armintegratedassembler">ARM Integrated Assembler</a>,
+ A full featured assembler and direct-to-object support for ARM.</li>
+ <li>....</li>
</ul>
-
+
</div>
+
<!--=========================================================================-->
<h3>
<a name="coreimprovements">LLVM IR and Core Improvements</a>
</h3>
<div>
-<p>LLVM IR has several new features for better support of new targets and that
-expose new optimization opportunities:</p>
-<ul>
-<!--
-<li></li>
--->
-</ul>
+<p>LLVM IR has several new features for better support of new targets and that
+ expose new optimization opportunities:</p>
+ <ul>
+ <li>IR support for half float</li>
+ <li>IR support for vectors of pointers, including vector GEPs.</li>
+ <li>Module flags have been introduced. They convey information about the
+ module as a whole to LLVM subsystems.</li>
+ <li>Loads can now have range metadata attached to them to describe the
+ possible values being loaded.</li>
+ <li>....</li>
+ </ul>
</div>
<!--=========================================================================-->
<div>
-<p>In addition to a large array of minor performance tweaks and bug fixes, this
-release includes a few major enhancements and additions to the optimizers:</p>
+<p>In addition to many minor performance tweaks and bug fixes, this
+ release includes a few major enhancements and additions to the
+ optimizers:</p>
<ul>
-<!--
-<li></li>
--->
-</li>
-
+ <li>The loop unroll pass now is able to unroll loops with run-time trip counts.
+ This feature is turned off by default, and is enabled with the
+ <code>-unroll-runtime</code> flag.</li>
+ <li>A new basic-block autovectorization pass is available. Pass
+ <code>-vectorize</code> to run this pass along with some associated
+ post-vectorization cleanup passes.</li>
+ <li>....</li>
</ul>
</div>
</h3>
<div>
-<p>
-The LLVM Machine Code (aka MC) subsystem was created to solve a number
-of problems in the realm of assembly, disassembly, object file format handling,
-and a number of other related areas that CPU instruction-set level tools work
-in.</p>
+
+<p>The LLVM Machine Code (aka MC) subsystem was created to solve a number of
+ problems in the realm of assembly, disassembly, object file format handling,
+ and a number of other related areas that CPU instruction-set level tools work
+ in. For more information, please see
+ the <a href="http://blog.llvm.org/2010/04/intro-to-llvm-mc-project.html">Intro
+ to the LLVM MC Project Blog Post</a>.</p>
<ul>
-<!--
-<li></li>
--->
+ <li>....</li>
</ul>
-<p>For more information, please see the <a
-href="http://blog.llvm.org/2010/04/intro-to-llvm-mc-project.html">Intro to the
-LLVM MC Project Blog Post</a>.
-</p>
-
</div>
<!--=========================================================================-->
<div>
+<p>We have changed the way that the Type Legalizer legalizes vectors. The type
+ legalizer now attempts to promote integer elements. This enabled the
+ implementation of vector-select. Additionally, we see a performance boost on
+ workloads which use vectors of chars and shorts, since they are now promoted
+ to 32-bit types, which are better supported by the SIMD instruction set.
+ Floating point types are still widened as before.</p>
+
+
<p>We have put a significant amount of work into the code generator
-infrastructure, which allows us to implement more aggressive algorithms and make
-it run faster:</p>
+ infrastructure, which allows us to implement more aggressive algorithms and
+ make it run faster:</p>
<ul>
-<!--
-<li></li>
--->
+ <li>TableGen can now synthesize register classes that are only needed to
+ represent combinations of constraints from instructions and sub-registers.
+ The synthetic register classes inherit most of their properties form their
+ closest user-defined super-class.</li>
+ <li><code>MachineRegisterInfo</code> now allows the reserved registers to be
+ frozen when register allocation starts. Target hooks should use the
+ <code>MRI->canReserveReg(FramePtr)</code> method to avoid accidentally
+ disabling frame pointer elimination during register allocation.</li>
+ <li>A new kind of <code>MachineOperand</code> provides a compact
+ representation of large clobber lists on call instructions. The register
+ mask operand references a bit mask of preserved registers. Everything else
+ is clobbered.</li>
</ul>
+
+<p> We added new TableGen infrastructure to support bundling for
+ Very Long Instruction Word (VLIW) architectures. TableGen can now
+ automatically generate a deterministic finite automaton from a VLIW
+ target's schedule description which can be queried to determine
+ legal groupings of instructions in a bundle.</p>
+
+<p> We have added a new target independent VLIW packetizer based on the
+ DFA infrastructure to group machine instructions into bundles.</p>
+
</div>
<!--=========================================================================-->
</h3>
<div>
-<p>New features and major changes in the X86 target include:
-</p>
-<ul>
-<li>The CRC32 intrinsics have been renamed. The intrinsics were previously
- @llvm.x86.sse42.crc32.[8|16|32] and @llvm.x86.sse42.crc64.[8|64]. They have
- been renamed to @llvm.x86.sse42.crc32.32.[8|16|32] and
- @llvm.x86.sse42.crc32.64.[8|64].</li>
+<p>New features and major changes in the X86 target include:</p>
+<ul>
+ <li>Bug fixes and improved support for AVX1</li>
+ <li>Support for AVX2 (still incomplete at this point)</li>
+ <li>Call instructions use the new register mask operands for faster compile
+ times and better support for different calling conventions. The old WINCALL
+ instructions are no longer needed.</li>
+ <li>DW2 Exception Handling is enabled on Cygwin and MinGW.</li>
+ <li>Support for implicit TLS model used with MS VC runtime</li>
</ul>
</div>
</h3>
<div>
-<p>New features of the ARM target include:
-</p>
+
+<p>New features of the ARM target include:</p>
<ul>
-<!--
-<li></li>
--->
+ <li>The constant island pass now supports basic block and constant pool entry
+ alignments greater than 4 bytes.</li>
+ <li>On Darwin, the ARM target now has a full-featured integrated assembler.
+ </li>
</ul>
-</div>
-
-<!--=========================================================================-->
-<h3>
-<a name="OtherTS">Other Target Specific Improvements</a>
-</h3>
+<h4>
+<a name="armintegratedassembler">ARM Integrated Assembler</a>
+</h4>
<div>
-<ul>
-<!--
-<li></li>
--->
-</ul>
+<p>The ARM target now includes a full featured macro assembler, including
+direct-to-object module support for clang. The assembler is currently enabled
+by default for Darwin only pending testing and any additional necessary
+platform specific support for Linux.</p>
+
+<p>Full support is included for Thumb1, Thumb2 and ARM modes, along with
+subtarget and CPU specific extensions for VFP2, VFP3 and NEON.</p>
+
+<p>The assembler is Unified Syntax only (see ARM Architecural Reference Manual
+for details). While there is some, and growing, support for pre-unfied (divided)
+syntax, there are still significant gaps in that support.</p>
</div>
+</div>
<!--=========================================================================-->
<h3>
-<a name="changes">Major Changes and Removed Features</a>
+<a name="MIPS">MIPS Target Improvements</a>
</h3>
<div>
-<p>If you're already an LLVM user or developer with out-of-tree changes based on
- LLVM 2.9, this section lists some "gotchas" that you may run into upgrading
- from the previous release.</p>
-
-<ul>
- <li>The <code>LLVMC</code> front end code was removed while separating
- out language independence.</li>
- <li>The <code>LowerSetJmp</code> pass wasn't used effectively by any
- target and has been removed.</li>
- <li>The old <code>TailDup</code> pass was not used in the standard pipeline
- and was unable to update ssa form, so it has been removed.
- <li>The syntax of volatile loads and stores in IR has been changed to
- "<code>load volatile</code>"/"<code>store volatile</code>". The old
- syntax ("<code>volatile load</code>"/"<code>volatile store</code>")
- is still accepted, but is now considered deprecated.</li>
- <li>The old atomic intrinscs (<code>llvm.memory.barrier</code> and
- <code>llvm.atomic.*</code>) are now gone. Please use the new atomic
- instructions, described in the <a href="Atomics.html">atomics guide</a>.
-</ul>
+<p>This release has seen major new work on just about every aspect of the MIPS
+ backend. Some of the major new features include:</p>
-<h4>Windows (32-bit)</h4>
-<div>
<ul>
- <li>On Win32(MinGW32 and MSVC), Windows 2000 will not be supported.
- Windows XP or higher is required.</li>
+ <li>....</li>
</ul>
</div>
-</div>
-
<!--=========================================================================-->
<h3>
-<a name="api_changes">Internal API Changes</a>
+<a name="OtherTS">Other Target Specific Improvements</a>
</h3>
<div>
-<p>In addition, many APIs have changed in this release. Some of the major
- LLVM API changes are:</p>
+<p>Support for Qualcomm's Hexagon VLIW processor has been added.</p>
<ul>
-<li>The biggest and most pervasive change is that llvm::Type's are no longer
- returned or accepted as 'const' values. Instead, just pass around non-const
- Type's.</li>
-
-<li><code>PHINode::reserveOperandSpace</code> has been removed. Instead, you
- must specify how many operands to reserve space for when you create the
- PHINode, by passing an extra argument into <code>PHINode::Create</code>.</li>
-
-<li>PHINodes no longer store their incoming BasicBlocks as operands. Instead,
- the list of incoming BasicBlocks is stored separately, and can be accessed
- with new functions <code>PHINode::block_begin</code>
- and <code>PHINode::block_end</code>.</li>
-
-<li>Various functions now take an <code>ArrayRef</code> instead of either a pair
- of pointers (or iterators) to the beginning and end of a range, or a pointer
- and a length. Others now return an <code>ArrayRef</code> instead of a
- reference to a <code>SmallVector</code> or <code>std::vector</code>. These
- include:
-<ul>
-<!-- Please keep this list sorted. -->
-<li><code>CallInst::Create</code></li>
-<li><code>ComputeLinearIndex</code> (in <code>llvm/CodeGen/Analysis.h</code>)</li>
-<li><code>ConstantArray::get</code></li>
-<li><code>ConstantExpr::getExtractElement</code></li>
-<li><code>ConstantExpr::getGetElementPtr</code></li>
-<li><code>ConstantExpr::getInBoundsGetElementPtr</code></li>
-<li><code>ConstantExpr::getIndices</code></li>
-<li><code>ConstantExpr::getInsertElement</code></li>
-<li><code>ConstantExpr::getWithOperands</code></li>
-<li><code>ConstantFoldCall</code> (in <code>llvm/Analysis/ConstantFolding.h</code>)</li>
-<li><code>ConstantFoldInstOperands</code> (in <code>llvm/Analysis/ConstantFolding.h</code>)</li>
-<li><code>ConstantVector::get</code></li>
-<li><code>DIBuilder::createComplexVariable</code></li>
-<li><code>DIBuilder::getOrCreateArray</code></li>
-<li><code>ExtractValueInst::Create</code></li>
-<li><code>ExtractValueInst::getIndexedType</code></li>
-<li><code>ExtractValueInst::getIndices</code></li>
-<li><code>FindInsertedValue</code> (in <code>llvm/Analysis/ValueTracking.h</code>)</li>
-<li><code>gep_type_begin</code> (in <code>llvm/Support/GetElementPtrTypeIterator.h</code>)</li>
-<li><code>gep_type_end</code> (in <code>llvm/Support/GetElementPtrTypeIterator.h</code>)</li>
-<li><code>GetElementPtrInst::Create</code></li>
-<li><code>GetElementPtrInst::CreateInBounds</code></li>
-<li><code>GetElementPtrInst::getIndexedType</code></li>
-<li><code>InsertValueInst::Create</code></li>
-<li><code>InsertValueInst::getIndices</code></li>
-<li><code>InvokeInst::Create</code></li>
-<li><code>IRBuilder::CreateCall</code></li>
-<li><code>IRBuilder::CreateExtractValue</code></li>
-<li><code>IRBuilder::CreateGEP</code></li>
-<li><code>IRBuilder::CreateInBoundsGEP</code></li>
-<li><code>IRBuilder::CreateInsertValue</code></li>
-<li><code>IRBuilder::CreateInvoke</code></li>
-<li><code>MDNode::get</code></li>
-<li><code>MDNode::getIfExists</code></li>
-<li><code>MDNode::getTemporary</code></li>
-<li><code>MDNode::getWhenValsUnresolved</code></li>
-<li><code>SimplifyGEPInst</code> (in <code>llvm/Analysis/InstructionSimplify.h</code>)</li>
-<li><code>TargetData::getIndexedOffset</code></li>
-</ul></li>
-
-<li>All forms of <code>StringMap::getOrCreateValue</code> have been remove
- except for the one which takes a <code>StringRef</code>.</li>
-
-<li>The <code>LLVMBuildUnwind</code> function from the C API was removed. The
- LLVM <code>unwind</code> instruction has been deprecated for a long time and
- isn't used by the current front-ends. So this was removed during the
- exception handling rewrite.</li>
-
-<li>The <code>LLVMAddLowerSetJmpPass</code> function from the C API was removed
- because the <code>LowerSetJmp</code> pass was removed.</li>
-
-<li>The <code>DIBuilder</code> interface used by front ends to encode debugging
- information in the LLVM IR now expects clients to use <code>DIBuilder::finalize()</code>
- at the end of translation unit to complete debugging information encoding.</li>
-
-<li>The way the type system works has been rewritten: <code>PATypeHolder</code>
-and <code>OpaqueType</code> are gone, and all APIs deal with <code>Type*</code>
-instead of <code>const Type*</code>.
-If you need to create recursive structures, then create a named structure,
-and use <code>setBody()</code> when all its elements are built.
-Type merging and refining is gone too: named structures are not
-merged with other structures, even if their layout is identical.
-(of course anonymous structures are still uniqued by layout).
-</li>
+ <li>....</li>
-<li>TargetSelect.h moved to Support/ from Target/</li>
-
-<li>UpgradeIntrinsicCall no longer upgrades pre-2.9 intrinsic calls
-(for example <code>llvm.memset.i32</code>).</li>
-
-<li>It is mandatory to initialize all out-of-tree passes too and their dependencies now with
-<code>INITIALIZE_PASS{BEGIN,END,}</code> and <code>INITIALIZE_{PASS,AG}_DEPENDENCY</code>.</li>
-
-<li>The interface for MemDepResult in MemoryDependenceAnalysis has been enhanced
- with new return types Unknown and NonFuncLocal, in addition to the existing
- types Clobber, Def, and NonLocal.</li>
</ul>
-</div>
</div>
-<!-- *********************************************************************** -->
-<h2>
- <a name="knownproblems">Known Problems</a>
-</h2>
-<!-- *********************************************************************** -->
-
-<div>
-
-<p>This section contains significant known problems with the LLVM system,
-listed by component. If you run into a problem, please check the <a
-href="http://llvm.org/bugs/">LLVM bug database</a> and submit a bug if
-there isn't already one.</p>
-
-<!-- ======================================================================= -->
+<!--=========================================================================-->
<h3>
- <a name="experimental">Experimental features included with this release</a>
+<a name="changes">Major Changes and Removed Features</a>
</h3>
<div>
-<p>The following components of this LLVM release are either untested, known to
-be broken or unreliable, or are in early development. These components should
-not be relied on, and bugs should not be filed against them, but they may be
-useful to some people. In particular, if you would like to work on one of these
-components, please contact us on the <a
-href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVMdev list</a>.</p>
+<p>If you're already an LLVM user or developer with out-of-tree changes based on
+ LLVM 3.1, this section lists some "gotchas" that you may run into upgrading
+ from the previous release.</p>
<ul>
-<li>The Alpha, CellSPU, MicroBlaze, MSP430, MIPS, PTX,
- and XCore backends are experimental.</li>
-<li><tt>llc</tt> "<tt>-filetype=obj</tt>" is experimental on all targets
- other than darwin and ELF X86 systems.</li>
-
+ <li>LLVM 3.1 removes support for reading LLVM 2.9 bitcode files. Going
+ forward, we aim for all future versions of LLVM to read bitcode files and
+ <tt>.ll</tt> files produced by LLVM 3.0 and later.</li>
+ <li>The <tt>unwind</tt> instruction is now gone. With the introduction of the
+ new exception handling system in LLVM 3.0, the <tt>unwind</tt> instruction
+ became obsolete.</li>
+ <li>....</li>
</ul>
</div>
-<!-- ======================================================================= -->
+<!--=========================================================================-->
<h3>
- <a name="x86-be">Known problems with the X86 back-end</a>
+<a name="api_changes">Internal API Changes</a>
</h3>
<div>
-<ul>
- <li>The X86 backend does not yet support
- all <a href="http://llvm.org/PR879">inline assembly that uses the X86
- floating point stack</a>. It supports the 'f' and 't' constraints, but not
- 'u'.</li>
- <li>The X86-64 backend does not yet support the LLVM IR instruction
- <tt>va_arg</tt>. Currently, front-ends support variadic
- argument constructs on X86-64 by lowering them manually.</li>
- <li>Windows x64 (aka Win64) code generator has a few issues.
- <ul>
- <li>llvm-gcc cannot build the mingw-w64 runtime currently
- due to lack of support for the 'u' inline assembly
- constraint and for X87 floating point inline assembly.</li>
- <li>On mingw-w64, you will see unresolved symbol <tt>__chkstk</tt>
- due to <a href="http://llvm.org/bugs/show_bug.cgi?id=8919">Bug 8919</a>.
- It is fixed in <a href="http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20110321/118499.html">r128206</a>.</li>
- <li>Miss-aligned MOVDQA might crash your program. It is due to
- <a href="http://llvm.org/bugs/show_bug.cgi?id=9483">Bug 9483</a>,
- lack of handling aligned internal globals.</li>
- </ul>
- </li>
-
-</ul>
-
-</div>
-
-<!-- ======================================================================= -->
-<h3>
- <a name="ppc-be">Known problems with the PowerPC back-end</a>
-</h3>
-
-<div>
+<p>In addition, many APIs have changed in this release. Some of the major
+ LLVM API changes are:</p>
<ul>
-<li>The Linux PPC32/ABI support needs testing for the interpreter and static
-compilation, and lacks support for debug information.</li>
+ <li>Target specific options have been moved from global variables to members
+ on the new <code>TargetOptions</code> class, which is local to each
+ <code>TargetMachine</code>. As a consequence, the associated flags will
+ no longer be accepted by <tt>clang -mllvm</tt>. This includes:
+<ul>
+<li><code>llvm::PrintMachineCode</code></li>
+<li><code>llvm::NoFramePointerElim</code></li>
+<li><code>llvm::NoFramePointerElimNonLeaf</code></li>
+<li><code>llvm::DisableFramePointerElim(const MachineFunction &)</code></li>
+<li><code>llvm::LessPreciseFPMADOption</code></li>
+<li><code>llvm::LessPrecideFPMAD()</code></li>
+<li><code>llvm::NoExcessFPPrecision</code></li>
+<li><code>llvm::UnsafeFPMath</code></li>
+<li><code>llvm::NoInfsFPMath</code></li>
+<li><code>llvm::NoNaNsFPMath</code></li>
+<li><code>llvm::HonorSignDependentRoundingFPMathOption</code></li>
+<li><code>llvm::HonorSignDependentRoundingFPMath()</code></li>
+<li><code>llvm::UseSoftFloat</code></li>
+<li><code>llvm::FloatABIType</code></li>
+<li><code>llvm::NoZerosInBSS</code></li>
+<li><code>llvm::JITExceptionHandling</code></li>
+<li><code>llvm::JITEmitDebugInfo</code></li>
+<li><code>llvm::JITEmitDebugInfoToDisk</code></li>
+<li><code>llvm::GuaranteedTailCallOpt</code></li>
+<li><code>llvm::StackAlignmentOverride</code></li>
+<li><code>llvm::RealignStack</code></li>
+<li><code>llvm::DisableJumpTables</code></li>
+<li><code>llvm::EnableFastISel</code></li>
+<li><code>llvm::getTrapFunctionName()</code></li>
+<li><code>llvm::EnableSegmentedStacks</code></li>
+</ul></li>
+ <li>The MDBuilder class has been added to simplify the creation of
+ metadata.</li>
+ <li>....</li>
</ul>
</div>
-<!-- ======================================================================= -->
+<!--=========================================================================-->
<h3>
- <a name="arm-be">Known problems with the ARM back-end</a>
+<a name="tools_changes">Tools Changes</a>
</h3>
<div>
-<ul>
-<li>Thumb mode works only on ARMv6 or higher processors. On sub-ARMv6
-processors, thumb programs can crash or produce wrong
-results (<a href="http://llvm.org/PR1388">PR1388</a>).</li>
-<li>Compilation for ARM Linux OABI (old ABI) is supported but not fully tested.
-</li>
-</ul>
+<p>In addition, some tools have changed in this release. Some of the changes
+ are:</p>
-</div>
-
-<!-- ======================================================================= -->
-<h3>
- <a name="sparc-be">Known problems with the SPARC back-end</a>
-</h3>
-
-<div>
<ul>
-<li>The SPARC backend only supports the 32-bit SPARC ABI (-m32); it does not
- support the 64-bit SPARC ABI (-m64).</li>
+ <li>llvm-stress is a command line tool for generating random .ll files to fuzz
+ different LLVM components. </li>
+ <li>....</li>
</ul>
-</div>
-
-<!-- ======================================================================= -->
-<h3>
- <a name="mips-be">Known problems with the MIPS back-end</a>
-</h3>
-
-<div>
-
<ul>
-<li>64-bit MIPS targets are not supported yet.</li>
+ <li>....</li>
</ul>
</div>
-<!-- ======================================================================= -->
-<h3>
- <a name="alpha-be">Known problems with the Alpha back-end</a>
-</h3>
-
-<div>
-
-<ul>
-
-<li>On 21164s, some rare FP arithmetic sequences which may trap do not have the
-appropriate nops inserted to ensure restartability.</li>
-
-</ul>
</div>
-<!-- ======================================================================= -->
-<h3>
- <a name="c-be">Known problems with the C back-end</a>
-</h3>
+<!-- *********************************************************************** -->
+<h2>
+ <a name="knownproblems">Known Problems</a>
+</h2>
+<!-- *********************************************************************** -->
<div>
-<p>The C backend has numerous problems and is not being actively maintained.
-Depending on it for anything serious is not advised.</p>
+<p>LLVM is generally a production quality compiler, and is used by a broad range
+ of applications and shipping in many products. That said, not every
+ subsystem is as mature as the aggregate, particularly the more obscure
+ targets. If you run into a problem, please check the <a
+ href="http://llvm.org/bugs/">LLVM bug database</a> and submit a bug if
+ there isn't already one or ask on the <a
+ href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVMdev
+ list</a>.</p>
-<ul>
-<li><a href="http://llvm.org/PR802">The C backend has only basic support for
- inline assembly code</a>.</li>
-<li><a href="http://llvm.org/PR1658">The C backend violates the ABI of common
- C++ programs</a>, preventing intermixing between C++ compiled by the CBE and
- C++ code compiled with <tt>llc</tt> or native compilers.</li>
-<li>The C backend does not support all exception handling constructs.</li>
-<li>The C backend does not support arbitrary precision integers.</li>
-</ul>
-
-</div>
+ <p>Known problem areas include:</p>
+<ul>
+ <li>The Alpha, Blackfin, CellSPU, MSP430, PTX, SystemZ and
+ XCore backends are experimental, and the Alpha, Blackfin and SystemZ
+ targets have already been removed from mainline.</li>
+
+ <li>The integrated assembler, disassembler, and JIT is not supported by
+ several targets. If an integrated assembler is not supported, then a
+ system assembler is required. For more details, see the <a
+ href="CodeGenerator.html#targetfeatures">Target Features Matrix</a>.
+ </li>
-<!-- ======================================================================= -->
-<h3>
- <a name="llvm-gcc">Known problems with the llvm-gcc front-end</a>
-</h3>
-
-<div>
-
-<p><b>LLVM 3.0 will be the last release of llvm-gcc.</b></p>
-
-<p>llvm-gcc is generally very stable for the C family of languages. The only
- major language feature of GCC not supported by llvm-gcc is the
- <tt>__builtin_apply</tt> family of builtins. However, some extensions
- are only supported on some targets. For example, trampolines are only
- supported on some targets (these are used when you take the address of a
- nested function).</p>
-
-<p>Fortran support generally works, but there are still several unresolved bugs
- in <a href="http://llvm.org/bugs/">Bugzilla</a>. Please see the
- tools/gfortran component for details. Note that llvm-gcc is missing major
- Fortran performance work in the frontend and library that went into GCC after
- 4.2. If you are interested in Fortran, we recommend that you consider using
- <a href="#dragonegg">dragonegg</a> instead.</p>
-
-<p>The llvm-gcc 4.2 Ada compiler has basic functionality, but is no longer being
-actively maintained. If you are interested in Ada, we recommend that you
-consider using <a href="#dragonegg">dragonegg</a> instead.</p>
-</div>
+ <li>The C backend has numerous problems and is not being actively maintained.
+ Depending on it for anything serious is not advised.</li>
+</ul>
</div>
<div>
-<p>A wide variety of additional information is available on the <a
-href="http://llvm.org/">LLVM web page</a>, in particular in the <a
-href="http://llvm.org/docs/">documentation</a> 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 "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p>
+<p>A wide variety of additional information is available on
+ the <a href="http://llvm.org/">LLVM web page</a>, in particular in
+ the <a href="http://llvm.org/docs/">documentation</a> 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 "<tt>llvm/doc/</tt>"
+ directory in the LLVM tree.</p>
<p>If you have any questions or comments about LLVM, please feel free to contact
-us via the <a href="http://llvm.org/docs/#maillist"> mailing
-lists</a>.</p>
+ us via the <a href="http://llvm.org/docs/#maillist"> mailing lists</a>.</p>
</div>
projects / oota-llvm.git / blobdiff