<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
- <meta encoding="utf8">
<link rel="stylesheet" href="llvm.css" type="text/css">
- <title>LLVM 2.8 Release Notes</title>
+ <title>LLVM 3.0 Release Notes</title>
</head>
<body>
-<div class="doc_title">LLVM 2.8 Release Notes</div>
+<h1>LLVM 3.0 Release Notes</h1>
<img align=right src="http://llvm.org/img/DragonSmall.png"
width="136" height="136" alt="LLVM Dragon Logo">
<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 2.8</a></li>
- <li><a href="#whatsnew">What's New in LLVM 2.8?</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="GettingStarted.html">Installation Instructions</a></li>
<li><a href="#knownproblems">Known Problems</a></li>
<li><a href="#additionalinfo">Additional Information</a></li>
</ol>
<div class="doc_author">
- <p>Written by the <a href="http://llvm.org">LLVM Team</a></p>
+ <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 2.8
+<h1 style="color:red">These are in-progress notes for the upcoming LLVM 3.0
release.<br>
You may prefer the
-<a href="http://llvm.org/releases/2.7/docs/ReleaseNotes.html">LLVM 2.7
+<a href="http://llvm.org/releases/2.9/docs/ReleaseNotes.html">LLVM 2.9
Release Notes</a>.</h1>
--->
+ -->
<!-- *********************************************************************** -->
-<div class="doc_section">
+<h2>
<a name="intro">Introduction</a>
-</div>
+</h2>
<!-- *********************************************************************** -->
-<div class="doc_text">
+<div>
<p>This document contains the release notes for the LLVM Compiler
-Infrastructure, release 2.8. 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 3.0. 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>
<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>
-
-
-<!--
-Almost dead code.
- include/llvm/Analysis/LiveValues.h => Dan
- lib/Transforms/IPO/MergeFunctions.cpp => consider for 2.8.
- GEPSplitterPass
--->
-
-<!-- Features that need text if they're finished for 2.9:
+<!-- Features that need text if they're finished for 3.1:
+ ARM EHABI
combiner-aa?
strong phi elim
loop dependence analysis
- TBAA
CorrelatedValuePropagation
+ lib/Transforms/IPO/MergeFunctions.cpp => consider for 3.1.
-->
- <!-- Announcement, lldb, libc++ -->
-
-
<!-- *********************************************************************** -->
-<div class="doc_section">
+<h2>
<a name="subproj">Sub-project Status Update</a>
-</div>
+</h2>
<!-- *********************************************************************** -->
-<div class="doc_text">
-<p>
-The LLVM 2.8 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>
-
-</div>
+<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>
<!--=========================================================================-->
-<div class="doc_subsection">
+<h3>
<a name="clang">Clang: C/C++/Objective-C Frontend Toolkit</a>
-</div>
+</h3>
-<div class="doc_text">
+<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 2.8 time-frame, the Clang team has made many improvements:</p>
-
- <ul>
- <li>Clang C++ is now feature-complete with respect to the ISO C++ 1998 and 2003 standards.</li>
- <li>Added support for Objective-C++.</li>
- <li>Clang now uses LLVM-MC to directly generate object code and to parse inline assembly (on Darwin).</li>
- <li>Introduced many new warnings, including <code>-Wmissing-field-initializers</code>, <code>-Wshadow</code>, <code>-Wno-protocol</code>, <code>-Wtautological-compare</code>, <code>-Wstrict-selector-match</code>, <code>-Wcast-align</code>, <code>-Wunused</code> improvements, and greatly improved format-string checking.</li>
- <li>Introduced the "libclang" library, a C interface to Clang intended to support IDE clients.</li>
- <li>Added support for <code>#pragma GCC visibility</code>, <code>#pragma align</code>, and others.</li>
- <li>Added support for SSE, AVX, ARM NEON, and AltiVec.</li>
- <li>Improved support for many Microsoft extensions.</li>
- <li>Implemented support for blocks in C++.</li>
- <li>Implemented precompiled headers for C++.</li>
- <li>Improved abstract syntax trees to retain more accurate source information.</li>
- <li>Added driver support for handling LLVM IR and bitcode files directly.</li>
- <li>Major improvements to compiler correctness for exception handling.</li>
- <li>Improved generated code quality in some areas:
- <ul>
- <li>Good code generation for X86-32 and X86-64 ABI handling.</li>
- <li>Improved code generation for bit-fields, although important work remains.</li>
- </ul>
- </li>
- </ul>
-</div>
+ 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>
-<!--=========================================================================-->
-<div class="doc_subsection">
-<a name="clangsa">Clang Static Analyzer</a>
-</div>
+<p>In the LLVM 3.0 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>
-<div class="doc_text">
+ <li>Implemented support
+ for <a href="http://clang.llvm.org/docs/AutomaticReferenceCounting.html">Automatic
+ Reference Counting</a> for Objective-C.</li>
-<p>The <a href="http://clang-analyzer.llvm.org/">Clang Static Analyzer</a>
- project is an effort to use static source code analysis techniques to
- automatically find bugs in C and Objective-C programs (and hopefully <a
- href="http://clang-analyzer.llvm.org/dev_cxx.html">C++ in the
- future</a>!). The tool is very good at finding bugs that occur on specific
- paths through code, such as on error conditions.</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>The LLVM 2.8 release fixes a number of bugs and slightly improves precision
- over 2.7, but there are no major new features in the release.
-</p>
+
+<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>
</div>
<!--=========================================================================-->
-<div class="doc_subsection">
-<a name="dragonegg">DragonEgg: llvm-gcc ported to gcc-4.5</a>
-</div>
+<h3>
+<a name="dragonegg">DragonEgg: GCC front-ends, LLVM back-end</a>
+</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>The 3.0 release has the following notable changes:</p>
-<div class="doc_text">
-<p>
-<a href="http://dragonegg.llvm.org/">DragonEgg</a> is a port of llvm-gcc to
-gcc-4.5. Unlike llvm-gcc, dragonegg in theory does not require any gcc-4.5
-modifications whatsoever (currently one small patch is needed) thanks to the
-new <a href="http://gcc.gnu.org/wiki/plugins">gcc plugin architecture</a>.
-DragonEgg is a gcc plugin that makes gcc-4.5 use the LLVM optimizers and code
-generators instead of gcc's, just like with llvm-gcc.
-</p>
-
-<p>
-DragonEgg is still a work in progress, but it is able to compile a lot of code,
-for example all of gcc, LLVM and clang. Currently Ada, C, C++ and Fortran work
-well, while all other languages either don't work at all or only work poorly.
-For the moment only the x86-32 and x86-64 targets are supported, and only on
-linux and darwin (darwin may need additional gcc patches).
-</p>
-
-<p>
-The 2.8 release has the following notable changes:
<ul>
-<li>The plugin loads faster due to exporting fewer symbols.</li>
-<li>Additional vector operations such as addps256 are now supported.</li>
-<li>Ada global variables with no initial value are no longer zero initialized,
-resulting in better optimization.</li>
-<li>The '-fplugin-arg-dragonegg-enable-gcc-optzns' flag now runs all gcc
-optimizers, rather than just a handful.</li>
-<li>Fortran programs using common variables now link correctly.</li>
-<li>GNU OMP constructs no longer crash the compiler.</li>
+<!--
+<li></li>
+-->
</ul>
</div>
<!--=========================================================================-->
-<div class="doc_subsection">
-<a name="vmkit">VMKit: JVM/CLI Virtual Machine Implementation</a>
-</div>
-
-<div class="doc_text">
-<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 2.8, VMKit now supports copying garbage
-collectors, and can be configured to use MMTk's copy mark-sweep garbage
-collector. In LLVM 2.8, the VMKit .NET VM is no longer being maintained.
-</p>
-</div>
-
-<!--=========================================================================-->
-<div class="doc_subsection">
+<h3>
<a name="compiler-rt">compiler-rt: Compiler Runtime Library</a>
-</div>
+</h3>
-<div class="doc_text">
-<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>
+<div>
-<p>
-All of the code in the compiler-rt project is available under the standard LLVM
-License, a "BSD-style" license. New in LLVM 2.8, compiler_rt now supports
-soft floating point (for targets that don't have a real floating point unit),
-and includes an extensive testsuite for the "blocks" language feature and the
-blocks runtime included in compiler_rt.</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>In the LLVM 3.0 timeframe,</p>
</div>
<!--=========================================================================-->
-<div class="doc_subsection">
+<h3>
<a name="lldb">LLDB: Low Level Debugger</a>
-</div>
+</h3>
-<div class="doc_text">
-<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>
+<div>
-<p>
-LLDB is in early development and not included as part of the LLVM 2.8 release,
-but is mature enough to support basic debugging scenarios on Mac OS X in C,
-Objective-C and C++. We'd really like help extending and expanding LLDB to
-support new platforms, new languages, new architectures, and new features.
-</p>
+<p>LLDB 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>
</div>
<!--=========================================================================-->
-<div class="doc_subsection">
+<h3>
<a name="libc++">libc++: C++ Standard Library</a>
+</h3>
+
+<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>
+
</div>
-<div class="doc_text">
-<p>
-<a href="http://libc++.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>
-As of the LLVM 2.8 release, libc++ is virtually feature complete, but would
-benefit from more testing and better integration with Clang++. It is also
-looking forward to the C++ committee finalizing the C++'0x standard.
-</p>
+<!--=========================================================================-->
+<h3>
+<a name="LLBrowse">LLBrowse: IR Browser</a>
+</h3>
+
+<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>
+<a name="vmkit">VMKit</a>
+</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>
+
+
<!--=========================================================================-->
-<div class="doc_subsection">
+<!--
+<h3>
<a name="klee">KLEE: A Symbolic Execution Virtual Machine</a>
-</div>
+</h3>
-<div class="doc_text">
+<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
be used to verify some algorithms.
</p>
-<p>Although KLEE does not have any major new features as of 2.8, we have made
-various minor improvements, particular to ease development:</p>
-<ul>
- <li>Added support for LLVM 2.8. KLEE currently maintains compatibility with
- LLVM 2.6, 2.7, and 2.8.</li>
- <li>Added a buildbot for 2.6, 2.7, and trunk. A 2.8 buildbot will be coming
- soon following release.</li>
- <li>Fixed many C++ code issues to allow building with Clang++. Mostly
- complete, except for the version of MiniSAT which is inside the KLEE STP
- version.</li>
- <li>Improved support for building with separate source and build
- directories.</li>
- <li>Added support for "long double" on x86.</li>
- <li>Initial work on KLEE support for using 'lit' test runner instead of
- DejaGNU.</li>
- <li>Added <tt>configure</tt> support for using an external version of
- STP.</li>
-</ul>
+<p>UPDATE!</p>
+</div>-->
</div>
-
<!-- *********************************************************************** -->
-<div class="doc_section">
- <a name="externalproj">External Open Source Projects Using LLVM 2.8</a>
-</div>
+<h2>
+ <a name="externalproj">External Open Source Projects Using LLVM 3.0</a>
+</h2>
<!-- *********************************************************************** -->
-<div class="doc_text">
+<div>
<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 2.8.</p>
-</div>
+ projects that have already been updated to work with LLVM 3.0.</p>
<!--=========================================================================-->
-<div class="doc_subsection">
-<a name="tce">TTA-based Codesign Environment (TCE)</a>
+<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>
-<div class="doc_text">
-<p>
-<a href="http://tce.cs.tut.fi/">TCE</a> 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>
+<!--=========================================================================-->
+<h3>ClamAV</h3>
+
+<div>
-<p>TCE uses llvm-gcc/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 "on the fly" 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>
+<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>
<!--=========================================================================-->
-<div class="doc_subsection">
-<a name="Horizon">Horizon Bytecode Compiler</a>
-</div>
+<h3>clReflect</h3>
-<div class="doc_text">
-<p>
-<a href="http://www.quokforge.org/projects/horizon">Horizon</a> is a bytecode
-language and compiler written on top of LLVM, intended for producing
-single-address-space managed code operating systems that
-run faster than the equivalent multiple-address-space C systems.
-More in-depth blurb is available on the <a
-href="http://www.quokforge.org/projects/horizon/wiki/Wiki">wiki</a>.</p>
+<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>
<!--=========================================================================-->
-<div class="doc_subsection">
-<a name="clamav">Clam AntiVirus</a>
-</div>
+<h3>Cling C++ Interpreter</h3>
-<div class="doc_text">
-<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. 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. 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 2.8.
-</p>
+<div>
-<p>The <a
-href="http://git.clamav.net/gitweb?p=clamav-bytecode-compiler.git;a=blob_plain;f=docs/user/clambc-user.pdf">
-ClamAV bytecode compiler</a> uses Clang and LLVM to compile a C-like
-language, insert runtime checks, and generate ClamAV bytecode.</p>
+<p><a href="http://cern.ch/cling">Cling</a> is an interactive compiler interface
+ (aka C++ interpreter). It uses LLVM's JIT and clang; it currently supports
+ C++ and C. It has a prompt interface, runs source files, calls into shared
+ libraries, prints the value of expressions, even does runtime lookup of
+ identifiers (dynamic scopes). And it just behaves like one would expect from
+ an interpreter.</p>
</div>
<!--=========================================================================-->
-<div class="doc_subsection">
-<a name="pure">Pure</a>
-</div>
+<h3>Crack Programming Language</h3>
-<div class="doc_text">
-<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. 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 C interface. The interpreter uses
-LLVM as a backend to JIT-compile Pure programs to fast native code.</p>
+<div>
-<p>Pure versions 0.44 and later have been tested and are known to work with
-LLVM 2.8 (and continue to work with older LLVM releases >= 2.5).</p>
+<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>
-
+
<!--=========================================================================-->
-<div class="doc_subsection">
-<a name="GHC">Glasgow Haskell Compiler (GHC)</a>
+<h3>Eero</h3>
+
+<div>
+
+<p><a href="http://eerolanguage.org/">Eero</a> is a fully
+ header-and-binary-compatible dialect of Objective-C 2.0, implemented with a
+ patched version of the Clang/LLVM compiler. It features a streamlined syntax,
+ Python-like indentation, and new operators, for improved readability and
+ reduced code clutter. It also has new features such as limited forms of
+ operator overloading and namespaces, and strict (type-and-operator-safe)
+ enumerations. It is inspired by languages such as Smalltalk, Python, and
+ Ruby.</p>
+
</div>
-<div class="doc_text">
-<p>
-<a href="http://www.haskell.org/ghc/">GHC</a> 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>
+<!--=========================================================================-->
+<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>In addition to the existing C and native code generators, GHC 7.0 now
-supports an <a
-href="http://hackage.haskell.org/trac/ghc/wiki/Commentary/Compiler/Backends/LLVM">LLVM
-code generator</a>. GHC supports LLVM 2.7 and later.</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>
<!--=========================================================================-->
-<div class="doc_subsection">
-<a name="Clay">Clay Programming Language</a>
+<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>
-<div class="doc_text">
-<p>
-<a href="http://tachyon.in/clay/">Clay</a> is a new systems programming
-language that is specifically designed for generic programming. It makes
-generic programming very concise thanks to whole program type propagation. It
-uses LLVM as its backend.</p>
+<!--=========================================================================-->
+<h3>include-what-you-use</h3>
+
+<div>
+
+<p><a href="http://code.google.com/p/include-what-you-use">include-what-you-use</a>
+ is a tool to ensure that a file directly <code>#include</code>s
+ all <code>.h</code> files that provide a symbol that the file uses. It also
+ removes superfluous <code>#include</code>s from source files.</p>
</div>
<!--=========================================================================-->
-<div class="doc_subsection">
-<a name="llvm-py">llvm-py Python Bindings for LLVM</a>
+<h3>ispc: The Intel SPMD Program Compiler</h3>
+
+<div>
+
+<p><a href="http://ispc.github.com">ispc</a> is a compiler for "single program,
+ multiple data" (SPMD) programs. It compiles a C-based SPMD programming
+ language to run on the SIMD units of CPUs; it often delivers 5-6x speedups on
+ a single core of a CPU with an 8-wide SIMD unit compared to serial code,
+ while still providing a clean and easy-to-understand programming model. For
+ an introduction to the language and its performance,
+ see <a href="http://ispc.github.com/example.html">the walkthrough of a short
+ example program. ispc is licensed under the BSD license.</p>
+
</div>
-<div class="doc_text">
-<p>
-<a href="http://www.mdevan.org/llvm-py/">llvm-py</a> has been updated to work
-with LLVM 2.8. llvm-py provides Python bindings for LLVM, allowing you to write a
-compiler backend or a VM in Python.</p>
+<!--=========================================================================-->
+<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>LuaAV</h3>
+
+<div>
+
+<p><a href="http://lua-av.mat.ucsb.edu/blog/">LuaAV</a> is a real-time
+ audiovisual scripting environment based around the Lua language and a
+ collection of libraries for sound, graphics, and other media protocols. LuaAV
+ uses LLVM and Clang to JIT compile efficient user-defined audio synthesis
+ routines specified in a declarative syntax.</p>
+
+</div>
<!--=========================================================================-->
-<div class="doc_subsection">
-<a name="FAUST">FAUST Real-Time Audio Signal Processing Language</a>
+<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>
-<div class="doc_text">
-<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 and
-2.8.</p>
+<!--=========================================================================-->
+<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>
<!--=========================================================================-->
-<div class="doc_subsection">
-<a name="jade">Jade Just-in-time Adaptive Decoder Engine</a>
+<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>
-<div class="doc_text">
-<p><a
-href="http://sourceforge.net/apps/trac/orcc/wiki/JadeDocumentation">Jade</a>
-(Just-in-time Adaptive Decoder Engine) is a generic video decoder engine using
-LLVM for just-in-time compilation of video decoder configurations. Those
-configurations are designed by MPEG Reconfigurable Video Coding (RVC) committee.
-MPEG RVC standard is built on a stream-based dataflow representation of
-decoders. It is composed of a standard library of coding tools written in
-RVC-CAL language and a dataflow configuration — block diagram —
-of a decoder.</p>
+<!--=========================================================================-->
+<h3>Renderscript</h3>
-<p>Jade project is hosted as part of the <a href="http://orcc.sf.net">Open
-RVC-CAL Compiler</a> and requires it to translate the RVC-CAL standard library
-of video coding tools into an LLVM assembly code.</p>
+<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>
<!--=========================================================================-->
-<div class="doc_subsection">
-<a name="neko_llvm_jit">LLVM JIT for Neko VM</a>
+<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>
-<div class="doc_text">
-<p><a href="http://github.com/vava/neko_llvm_jit">Neko LLVM JIT</a>
-replaces the standard Neko JIT with an LLVM-based implementation. While not
-fully complete, it is already providing a 1.5x speedup on 64-bit systems.
-Neko LLVM JIT requires LLVM 2.8 or later.</p>
+<!--=========================================================================-->
+<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>
<!--=========================================================================-->
-<div class="doc_subsection">
-<a name="crack">Crack Scripting Language</a>
+<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 "on the fly" 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 class="doc_text">
-<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. Crack 0.2 works with LLVM 2.7, and the forthcoming Crack 0.2.1 release
-builds on LLVM 2.8.</p>
+<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>
<!--=========================================================================-->
-<div class="doc_subsection">
-<a name="DresdenTM">Dresden TM Compiler (DTMC)</a>
+<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 and Pin) 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>
-<div class="doc_text">
-<p>
-<a href="http://tm.inf.tu-dresden.de">DTMC</a> provides support for
-Transactional Memory, which is an easy-to-use and efficient way to synchronize
-accesses to shared memory. Transactions can contain normal C/C++ code (e.g.,
-<code>__transaction { list.remove(x); x.refCount--; }</code>) and will be executed
-virtually atomically and isolated from other transactions.</p>
+<!--=========================================================================-->
+<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>
<!--=========================================================================-->
-<div class="doc_subsection">
-<a name="Kai">Kai Programming Language</a>
+<!--
+<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 class="doc_text">
+<div>
<p>
-<a href="http://www.oriontransfer.co.nz/research/kai">Kai</a> (Japanese 会 for
-meeting/gathering) is an experimental interpreter that provides a highly
-extensible runtime environment and explicit control over the compilation
-process. Programs are defined using nested symbolic expressions, which are all
-parsed into first-class values with minimal intrinsic semantics. Kai can
-generate optimised code at run-time (using LLVM) in order to exploit the nature
-of the underlying hardware and to integrate with external software libraries.
-It is a unique exploration into world of dynamic code compilation, and the
-interaction between high level and low level semantics.</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>
+-->
<!--=========================================================================-->
-<div class="doc_subsection">
-<a name="OSL">OSL: Open Shading Language</a>
+<!--
+<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>
+-->
-<div class="doc_text">
-<p>
-<a href="http://code.google.com/p/openshadinglanguage/">OSL</a> is a shading
-language designed for use in physically based renderers and in particular
-production rendering. By using LLVM instead of the interpreter, it was able to
-meet its performance goals (>= C-code) while retaining the benefits of
-runtime specialization and a portable high-level language.
-</p>
+<!--=========================================================================-->
+<!--
+<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>
+<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>
-<!-- *********************************************************************** -->
-<div class="doc_section">
- <a name="whatsnew">What's New in LLVM 2.8?</a>
</div>
+-->
+
+</div>
+
+<!-- *********************************************************************** -->
+<h2>
+ <a name="whatsnew">What's New in LLVM 3.0?</a>
+</h2>
<!-- *********************************************************************** -->
-<div class="doc_text">
+<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>
-
-</div>
+ minor improvements. Some of the major improvements and new features are
+ listed in this section.</p>
<!--=========================================================================-->
-<div class="doc_subsection">
+<h3>
<a name="majorfeatures">Major New Features</a>
-</div>
+</h3>
-<div class="doc_text">
+<div>
-<p>LLVM 2.8 includes several major new capabilities:</p>
+<p>LLVM 3.0 includes several major new capabilities:</p>
<ul>
-<li>As mentioned above, <a href="#libc++">libc++</a> and <a
- href="#lldb">LLDB</a> are major new additions to the LLVM collective.</li>
-<li>LLVM 2.8 now has pretty decent support for debugging optimized code. You
- should be able to reliably get debug info for function arguments, assuming
- that the value is actually available where you have stopped.</li>
-<li>A new 'llvm-diff' tool is available that does a semantic diff of .ll
- files.</li>
-<li>The <a href="#mc">MC subproject</a> has made major progress in this release.
- Direct .o file writing support for darwin/x86[-64] is now reliable and
- support for other targets and object file formats are in progress.</li>
-</ul>
+<!--
+<li></li>
+-->
+
+</ul>
+
</div>
<!--=========================================================================-->
-<div class="doc_subsection">
+<h3>
<a name="coreimprovements">LLVM IR and Core Improvements</a>
-</div>
+</h3>
+
+<div>
-<div class="doc_text">
<p>LLVM IR has several new features for better support of new targets and that
-expose new optimization opportunities:</p>
+ expose new optimization opportunities:</p>
+
+<p>One of the biggest changes is that 3.0 has a new exception handling
+ system. The old system used LLVM intrinsics to convey the exception handling
+ information to the code generator. It worked in most cases, but not
+ all. Inlining was especially difficult to get right. Also, the intrinsics
+ could be moved away from the <code>invoke</code> instruction, making it hard
+ to recover that information.</p>
+
+<p>The new EH system makes exception handling a first-class member of the IR. It
+ adds two new instructions:</p>
<ul>
-<li>The <a href="LangRef.html#int_libc">memcpy, memmove, and memset</a>
- intrinsics now take address space qualified pointers and a bit to indicate
- whether the transfer is "<a href="LangRef.html#volatile">volatile</a>" or not.
-</li>
-<li>Per-instruction debug info metadata is much faster and uses less memory by
- using the new DebugLoc class.</li>
-<li>LLVM IR now has a more formalized concept of "<a
- href="LangRef.html#trapvalues">trap values</a>", which allow the optimizer
- to optimize more aggressively in the presence of undefined behavior, while
- still producing predictable results.</li>
-<li>LLVM IR now supports two new <a href="LangRef.html#linkage">linkage
- types</a> (linker_private_weak and linker_private_weak_def_auto) which map
- onto some obscure MachO concepts.</li>
+ <li><a href="LangRef.html#i_landingpad"><code>landingpad</code></a> —
+ this instruction defines a landing pad basic block. It contains all of the
+ information that's needed by the code generator. It's also required to be
+ the first non-PHI instruction in the landing pad. In addition, a landing
+ pad may be jumped to only by the unwind edge of an <code>invoke</code>
+ instruction.</li>
+
+ <li><a href="LangRef.html#i_resume"><code>resume</code></a> — this
+ instruction causes the current exception to resume traveling up the
+ stack. It replaces the <code>@llvm.eh.resume</code> intrinsic.</li>
</ul>
+<p>Converting from the old EH API to the new EH API is rather simple, because a
+ lot of complexity has been removed. The two intrinsics,
+ <code>@llvm.eh.exception</code> and <code>@llvm.eh.selector</code> have been
+ superceded by the <code>landingpad</code> instruction. Instead of generating
+ a call to <code>@llvm.eh.exception</code> and <code>@llvm.eh.selector</code>:
+
+<div class="doc_code">
+<pre>
+Function *ExcIntr = Intrinsic::getDeclaration(TheModule,
+ Intrinsic::eh_exception);
+Function *SlctrIntr = Intrinsic::getDeclaration(TheModule,
+ Intrinsic::eh_selector);
+
+// The exception pointer.
+Value *ExnPtr = Builder.CreateCall(ExcIntr, "exc_ptr");
+
+std::vector<Value*> Args;
+Args.push_back(ExnPtr);
+Args.push_back(Builder.CreateBitCast(Personality,
+ Type::getInt8PtrTy(Context)));
+
+<i>// Add selector clauses to Args.</i>
+
+// The selector call.
+Builder.CreateCall(SlctrIntr, Args, "exc_sel");
+</pre>
+</div>
+
+<p>You should instead generate a <code>landingpad</code> instruction, that
+ returns an exception object and selector value:</p>
+
+<div class="doc_code">
+<pre>
+LandingPadInst *LPadInst =
+ Builder.CreateLandingPad(StructType::get(Int8PtrTy, Int32Ty, NULL),
+ Personality, 0);
+
+Value *LPadExn = Builder.CreateExtractValue(LPadInst, 0);
+Builder.CreateStore(LPadExn, getExceptionSlot());
+
+Value *LPadSel = Builder.CreateExtractValue(LPadInst, 1);
+Builder.CreateStore(LPadSel, getEHSelectorSlot());
+</pre>
+</div>
+
+<p>It's now trivial to add the individual clauses to the <code>landingpad</code>
+ instruction.</p>
+
+<div class="doc_code">
+<pre>
+<i><b>// Adding a catch clause</b></i>
+Constant *TypeInfo = getTypeInfo();
+LPadInst->addClause(TypeInfo);
+
+<i><b>// Adding a C++ catch-all</b></i>
+LPadInst->addClause(Constant::getNullValue(Builder.getInt8PtrTy()));
+
+<i><b>// Adding a cleanup</b></i>
+LPadInst->setCleanup(true);
+
+<i><b>// Adding a filter clause</b></i>
+std::vector<Constant*> TypeInfos;
+Constant *TypeInfo = getFilterTypeInfo();
+TypeInfos.push_back(Builder.CreateBitCast(TypeInfo, Builder.getInt8PtrTy()));
+
+ArrayType *FilterTy = ArrayType::get(Int8PtrTy, TypeInfos.size());
+LPadInst->addClause(ConstantArray::get(FilterTy, TypeInfos));
+</pre>
+</div>
+
+<p>Converting from using the <code>@llvm.eh.resume</code> intrinsic to
+ the <code>resume</code> instruction is trivial. It takes the exception
+ pointer and exception selector values returned by
+ the <code>landingpad</code> instruction:</p>
+
+<div class="doc_code">
+<pre>
+Type *UnwindDataTy = StructType::get(Builder.getInt8PtrTy(),
+ Builder.getInt32Ty(), NULL);
+Value *UnwindData = UndefValue::get(UnwindDataTy);
+Value *ExcPtr = Builder.CreateLoad(getExceptionObjSlot());
+Value *ExcSel = Builder.CreateLoad(getExceptionSelSlot());
+UnwindData = Builder.CreateInsertValue(UnwindData, ExcPtr, 0, "exc_ptr");
+UnwindData = Builder.CreateInsertValue(UnwindData, ExcSel, 1, "exc_sel");
+Builder.CreateResume(UnwindData);
+</pre>
+</div>
+
</div>
<!--=========================================================================-->
-<div class="doc_subsection">
-<a name="optimizer">Optimizer Improvements</a>
+<h3>
+<a name="loopoptimization">Loop Optimization Improvements</a>
+</h3>
+
+<div>
+<p>The induction variable simplification pass in 3.0 only modifies
+ induction variables when profitable. Sign and zero extension
+ elimination, linear function test replacement, loop unrolling, and
+ other simplifications that require induction variable analysis have
+ been generalized so they no longer require loops to be rewritten in a
+ typically suboptimal form prior to optimization. This new design
+ preserves more IR level information, avoids undoing earlier loop
+ optimizations (particularly hand-optimized loops), and no longer
+ strongly depends on the code generator rewriting loops a second time
+ in a now optimal form--an intractable problem.</p>
+
+<p>The original behavior can be restored with -mllvm -enable-iv-rewrite;
+ however, support for this mode will be short lived. As such, bug
+ reports should be filed for any significant performance regressions
+ when moving from -mllvm -enable-iv-rewrite to the 3.0 default mode.</p>
</div>
-<div class="doc_text">
+<!--=========================================================================-->
+<h3>
+<a name="optimizer">Optimizer Improvements</a>
+</h3>
+
+<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>
+ release includes a few major enhancements and additions to the
+ optimizers:</p>
<ul>
-<li>As mentioned above, the optimizer now has support for updating debug
- information as it goes. A key aspect of this is the new <a
- href="SourceLevelDebugging.html#format_common_value">llvm.dbg.value</a>
- intrinsic. This intrinsic represents debug info for variables that are
- promoted to SSA values (typically by mem2reg or the -scalarrepl passes).</li>
-
-<li>The JumpThreading pass is now much more aggressive about implied value
- relations, allowing it to thread conditions like "a == 4" when a is known to
- be 13 in one of the predecessors of a block. It does this in conjunction
- with the new LazyValueInfo analysis pass.</li>
-<li>The new RegionInfo analysis pass identifies single-entry single-exit regions
- in the CFG. You can play with it with the "opt -regions analyze" or
- "opt -view-regions" commands.</li>
-<li>The loop optimizer has significantly improved strength reduction and analysis
- capabilities. Notably it is able to build on the trap value and signed
- integer overflow information to optimize <= and >= loops.</li>
-<li>The CallGraphSCCPassManager now has some basic support for iterating within
- an SCC when a optimizer devirtualizes a function call. This allows inlining
- through indirect call sites that are devirtualized by store-load forwarding
- and other optimizations.</li>
-<li>The new <A href="Passes.html#loweratomic">-loweratomic</a> pass is available
- to lower atomic instructions into their non-atomic form. This can be useful
- to optimize generic code that expects to run in a single-threaded
- environment.</li>
-</ul>
-
<!--
-<p>In addition to these features that are done in 2.8, there is preliminary
- support in the release for Type Based Alias Analysis
- Preliminary work on TBAA but not usable in 2.8.
- New CorrelatedValuePropagation pass, not on by default in 2.8 yet.
+<li></li>
-->
+</li>
+
+</ul>
</div>
<!--=========================================================================-->
-<div class="doc_subsection">
+<h3>
<a name="mc">MC Level Improvements</a>
-</div>
+</h3>
-<div class="doc_text">
-<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>
+<div>
-<p>The MC subproject has made great leaps in LLVM 2.8. For example, support for
- directly writing .o files from LLC (and clang) now works reliably for
- darwin/x86[-64] (including inline assembly support) and the integrated
- assembler is turned on by default in Clang for these targets. This provides
- improved compile times among other things.</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.</p>
<ul>
-<li>The entire compiler has converted over to using the MCStreamer assembler API
- instead of writing out a .s file textually.</li>
-<li>The "assembler parser" is far more mature than in 2.7, supporting a full
- complement of directives, now supports assembler macros, etc.</li>
-<li>The "assembler backend" has been completed, including support for relaxation
- relocation processing and all the other things that an assembler does.</li>
-<li>The MachO file format support is now fully functional and works.</li>
-<li>The MC disassembler now fully supports ARM and Thumb. ARM assembler support
- is still in early development though.</li>
-<li>The X86 MC assembler now supports the X86 AES and AVX instruction set.</li>
-<li>Work on ELF and COFF object files and ARM target support is well underway,
- but isn't useful yet in LLVM 2.8. Please contact the llvmdev mailing list
- if you're interested in this.</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>
+<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 class="doc_subsection">
+<h3>
<a name="codegen">Target Independent Code Generator Improvements</a>
-</div>
+</h3>
-<div class="doc_text">
+<div>
<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>The clang/gcc -momit-leaf-frame-pointer argument is now supported.</li>
-<li>The clang/gcc -ffunction-sections and -fdata-sections arguments are now
- supported on ELF targets (like GCC).</li>
-<li>The MachineCSE pass is now tuned and on by default. It eliminates common
- subexpressions that are exposed when lowering to machine instructions.</li>
-<li>The "local" register allocator was replaced by a new "fast" register
- allocator. This new allocator (which is often used at -O0) is substantially
- faster and produces better code than the old local register allocator.</li>
-<li>A new LLC "-regalloc=default" option is available, which automatically
- chooses a register allocator based on the -O optimization level.</li>
-<li>The common code generator code was modified to promote illegal argument and
- return value vectors to wider ones when possible instead of scalarizing
- them. For example, <3 x float> will now pass in one SSE register
- instead of 3 on X86. This generates substantially better code since the
- rest of the code generator was already expecting this.</li>
-<li>The code generator uses a new "COPY" machine instruction. This speeds up
- the code generator and eliminates the need for targets to implement the
- isMoveInstr hook. Also, the copyRegToReg hook was renamed to copyPhysReg
- and simplified.</li>
-<li>The code generator now has a "LocalStackSlotPass", which optimizes stack
- slot access for targets (like ARM) that have limited stack displacement
- addressing.</li>
-<li>A new "PeepholeOptimizer" is available, which eliminates sign and zero
- extends, and optimizes away compare instructions when the condition result
- is available from a previous instruction.</li>
-<li>Atomic operations now get legalized into simpler atomic operations if not
- natively supported, easing the implementation burden on targets.</li>
-<li>We have added two new bottom-up pre-allocation register pressure aware schedulers:
-<ol>
-<li>The hybrid scheduler schedules aggressively to minimize schedule length when registers are available and avoid overscheduling in high pressure situations.</li>
-<li>The instruction-level-parallelism scheduler schedules for maximum ILP when registers are available and avoid overscheduling in high pressure situations.</li>
-</ol></li>
-<li>The tblgen type inference algorithm was rewritten to be more consistent and
- diagnose more target bugs. If you have an out-of-tree backend, you may
- find that it finds bugs in your target description. This support also
- allows limited support for writing patterns for instructions that return
- multiple results (e.g. a virtual register and a flag result). The
- 'parallel' modifier in tblgen was removed, you should use the new support
- for multiple results instead.</li>
-<li>A new (experimental) "-rendermf" pass is available which renders a
- MachineFunction into HTML, showing live ranges and other useful
- details.</li>
-<li>The new SubRegIndex tablegen class allows subregisters to be indexed
- symbolically instead of numerically. If your target uses subregisters you
- will need to adapt to use SubRegIndex when you upgrade to 2.8.</li>
-<!-- SplitKit -->
-
-<li>The -fast-isel instruction selection path (used at -O0 on X86) was rewritten
- to work bottom-up on basic blocks instead of top down. This makes it
- slightly faster (because the MachineDCE pass is not needed any longer) and
- allows it to generate better code in some cases.</li>
-
+<!--
+<li></li>
+-->
</ul>
</div>
<!--=========================================================================-->
-<div class="doc_subsection">
+<h3>
<a name="x86">X86-32 and X86-64 Target Improvements</a>
-</div>
+</h3>
-<div class="doc_text">
-<p>New features and major changes in the X86 target include:
-</p>
+<div>
+
+<p>New features and major changes in the X86 target include:</p>
<ul>
-<li>The X86 backend now supports holding X87 floating point stack values
- in registers across basic blocks, dramatically improving performance of code
- that uses long double, and when targeting CPUs that don't support SSE.</li>
-
-<li>The X86 backend now uses a SSEDomainFix pass to optimize SSE operations. On
- Nehalem ("Core i7") and newer CPUs there is a 2 cycle latency penalty on
- using a register in a different domain than where it was defined. This pass
- optimizes away these stalls.</li>
-
-<li>The X86 backend now promotes 16-bit integer operations to 32-bits when
- possible. This avoids 0x66 prefixes, which are slow on some
- microarchitectures and bloat the code on all of them.</li>
-
-<li>The X86 backend now supports the Microsoft "thiscall" calling convention,
- and a <a href="LangRef.html#callingconv">calling convention</a> to support
- <a href="#GHC">ghc</a>.</li>
-
-<li>The X86 backend supports a new "llvm.x86.int" intrinsic, which maps onto
- the X86 "int $42" and "int3" instructions.</li>
-
-<li>At the IR level, the <2 x float> datatype is now promoted and passed
- around as a <4 x float> instead of being passed and returned as an MMX
- vector. If you have a frontend that uses this, please pass and return a
- <2 x i32> instead (using bitcasts).</li>
-
-<li>When printing .s files in verbose assembly mode (the default for clang -S),
- the X86 backend now decodes X86 shuffle instructions and prints human
- readable comments after the most inscrutable of them, e.g.:
-
-<pre>
- insertps $113, %xmm3, %xmm0 <i># xmm0 = zero,xmm0[1,2],xmm3[1]</i>
- unpcklps %xmm1, %xmm0 <i># xmm0 = xmm0[0],xmm1[0],xmm0[1],xmm1[1]</i>
- pshufd $1, %xmm1, %xmm1 <i># xmm1 = xmm1[1,0,0,0]</i>
-</pre>
-</li>
-
+
+ <li>The CRC32 intrinsics have been renamed. The intrinsics were previously
+ <code>@llvm.x86.sse42.crc32.[8|16|32]</code>
+ and <code>@llvm.x86.sse42.crc64.[8|64]</code>. They have been renamed to
+ <code>@llvm.x86.sse42.crc32.32.[8|16|32]</code> and
+ <code>@llvm.x86.sse42.crc32.64.[8|64]</code>.</li>
+
</ul>
</div>
<!--=========================================================================-->
-<div class="doc_subsection">
+<h3>
<a name="ARM">ARM Target Improvements</a>
-</div>
+</h3>
-<div class="doc_text">
-<p>New features of the ARM target include:
-</p>
+<div>
+
+<p>New features of the ARM target include:</p>
<ul>
-<li>The ARM backend now optimizes tail calls into jumps.</li>
-<li>Scheduling is improved through the new list-hybrid scheduler as well
- as through better modeling of structural hazards.</li>
-<li><a href="LangRef.html#int_fp16">Half float</a> instructions are now
- supported.</li>
-<li>NEON support has been improved to model instructions which operate onto
- multiple consecutive registers more aggressively. This avoids lots of
- extraneous register copies.</li>
-<li>The ARM backend now uses a new "ARMGlobalMerge" pass, which merges several
- global variables into one, saving extra address computation (all the global
- variables can be accessed via same base address) and potentially reducing
- register pressure.</li>
-
-<li>The ARM backend has received many minor improvements and tweaks which lead
- to substantially better performance in a wide range of different scenarios.
-</li>
+<!--
+<li></li>
+-->
+</ul>
+</div>
+
+<!--=========================================================================-->
+<h3>
+<a name="OtherTS">Other Target Specific Improvements</a>
+</h3>
-<li>The ARM NEON intrinsics have been substantially reworked to reduce
- redundancy and improve code generation. Some of the major changes are:
- <ol>
- <li>
- All of the NEON load and store intrinsics (llvm.arm.neon.vld* and
- llvm.arm.neon.vst*) take an extra parameter to specify the alignment in bytes
- of the memory being accessed.
- </li>
- <li>
- The llvm.arm.neon.vaba intrinsic (vector absolute difference and
- accumulate) has been removed. This operation is now represented using
- the llvm.arm.neon.vabd intrinsic (vector absolute difference) followed by a
- vector add.
- </li>
- <li>
- The llvm.arm.neon.vabdl and llvm.arm.neon.vabal intrinsics (lengthening
- vector absolute difference with and without accumulation) have been removed.
- They are represented using the llvm.arm.neon.vabd intrinsic (vector absolute
- difference) followed by a vector zero-extend operation, and for vabal,
- a vector add.
- </li>
- <li>
- The llvm.arm.neon.vmovn intrinsic has been removed. Calls of this intrinsic
- are now replaced by vector truncate operations.
- </li>
- <li>
- The llvm.arm.neon.vmovls and llvm.arm.neon.vmovlu intrinsics have been
- removed. They are now represented as vector sign-extend (vmovls) and
- zero-extend (vmovlu) operations.
- </li>
- <li>
- The llvm.arm.neon.vaddl*, llvm.arm.neon.vaddw*, llvm.arm.neon.vsubl*, and
- llvm.arm.neon.vsubw* intrinsics (lengthening vector add and subtract) have
- been removed. They are replaced by vector add and vector subtract operations
- where one (vaddw, vsubw) or both (vaddl, vsubl) of the operands are either
- sign-extended or zero-extended.
- </li>
- <li>
- The llvm.arm.neon.vmulls, llvm.arm.neon.vmullu, llvm.arm.neon.vmlal*, and
- llvm.arm.neon.vmlsl* intrinsics (lengthening vector multiply with and without
- accumulation and subtraction) have been removed. These operations are now
- represented as vector multiplications where the operands are either
- sign-extended or zero-extended, followed by a vector add for vmlal or a
- vector subtract for vmlsl. Note that the polynomial vector multiply
- intrinsic, llvm.arm.neon.vmullp, remains unchanged.
- </li>
- </ol>
-</li>
+<p>PPC32/ELF va_arg was implemented.</p>
+<p>PPC32 initial support for .o file writing was implemented.</p>
+
+<div>
+<ul>
+<!--
+<li></li>
+-->
</ul>
-</div>
+</div>
<!--=========================================================================-->
-<div class="doc_subsection">
+<h3>
<a name="changes">Major Changes and Removed Features</a>
-</div>
+</h3>
-<div class="doc_text">
+<div>
-<p>If you're already an LLVM user or developer with out-of-tree changes based
-on LLVM 2.7, this section lists some "gotchas" that you may run into upgrading
-from the previous release.</p>
+<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 build configuration machinery changed the output directory names. It
- wasn't clear to many people that a "Release-Asserts" build was a release build
- without asserts. To make this more clear, "Release" does not include
- assertions and "Release+Asserts" does (likewise, "Debug" and
- "Debug+Asserts").</li>
-<li>The MSIL Backend was removed, it was unsupported and broken.</li>
-<li>The ABCD, SSI, and SCCVN passes were removed. These were not fully
- functional and their behavior has been or will be subsumed by the
- LazyValueInfo pass.</li>
-<li>The LLVM IR 'Union' feature was removed. While this is a desirable feature
- for LLVM IR to support, the existing implementation was half baked and
- barely useful. We'd really like anyone interested to resurrect the work and
- finish it for a future release.</li>
-<li>If you're used to reading .ll files, you'll probably notice that .ll file
- dumps don't produce #uses comments anymore. To get them, run a .bc file
- through "llvm-dis --show-annotations".</li>
-<li>Target triples are now stored in a normalized form, and all inputs from
- humans are expected to be normalized by Triple::normalize before being
- stored in a module triple or passed to another library.</li>
+ <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>
+<h4>Windows (32-bit)</h4>
+<div>
-
-<p>In addition, many APIs have changed in this release. Some of the major LLVM
-API changes are:</p>
<ul>
-<li>LLVM 2.8 changes the internal order of operands in <a
- href="http://llvm.org/doxygen/classllvm_1_1InvokeInst.html"><tt>InvokeInst</tt></a>
- and <a href="http://llvm.org/doxygen/classllvm_1_1CallInst.html"><tt>CallInst</tt></a>.
- To be portable across releases, please use the <tt>CallSite</tt> class and the
- high-level accessors, such as <tt>getCalledValue</tt> and
- <tt>setUnwindDest</tt>.
-</li>
-<li>
- You can no longer pass use_iterators directly to cast<> (and similar),
- because these routines tend to perform costly dereference operations more
- than once. You have to dereference the iterators yourself and pass them in.
-</li>
-<li>
- llvm.memcpy.*, llvm.memset.*, llvm.memmove.* intrinsics take an extra
- parameter now ("i1 isVolatile"), totaling 5 parameters, and the pointer
- operands are now address-space qualified.
- If you were creating these intrinsic calls and prototypes yourself (as opposed
- to using Intrinsic::getDeclaration), you can use
- UpgradeIntrinsicFunction/UpgradeIntrinsicCall to be portable across releases.
-</li>
-<li>
- SetCurrentDebugLocation takes a DebugLoc now instead of a MDNode.
- Change your code to use
- SetCurrentDebugLocation(DebugLoc::getFromDILocation(...)).
-</li>
-<li>
- The <tt>RegisterPass</tt> and <tt>RegisterAnalysisGroup</tt> templates are
- considered deprecated, but continue to function in LLVM 2.8. Clients are
- strongly advised to use the upcoming <tt>INITIALIZE_PASS()</tt> and
- <tt>INITIALIZE_AG_PASS()</tt> macros instead.
-</li>
-<li>
- The constructor for the Triple class no longer tries to understand odd triple
- specifications. Frontends should ensure that they only pass valid triples to
- LLVM. The Triple::normalize utility method has been added to help front-ends
- deal with funky triples.
-</li>
-
-<li>
- Some APIs were renamed:
- <ul>
- <li>llvm_report_error -> report_fatal_error</li>
- <li>llvm_install_error_handler -> install_fatal_error_handler</li>
- <li>llvm::DwarfExceptionHandling -> llvm::JITExceptionHandling</li>
- <li>VISIBILITY_HIDDEN -> LLVM_LIBRARY_VISIBILITY</li>
- </ul>
-</li>
-
-<li>
- Some public headers were renamed:
- <ul>
- <li><tt>llvm/Assembly/AsmAnnotationWriter.h</tt> was renamed
- to <tt>llvm/Assembly/AssemblyAnnotationWriter.h</tt>
- </li>
- </ul>
+ <li>On Win32(MinGW32 and MSVC), Windows 2000 will not be supported.
+ Windows XP or higher is required.</li>
</ul>
</div>
-<!--=========================================================================-->
-<div class="doc_subsection">
-<a name="devtree_changes">Development Infrastructure Changes</a>
</div>
-<div class="doc_text">
+<!--=========================================================================-->
+<h3>
+<a name="api_changes">Internal API Changes</a>
+</h3>
-<p>This section lists changes to the LLVM development infrastructure. This
-mostly impacts users who actively work on LLVM or follow development on
-mainline, but may also impact users who leverage the LLVM build infrastructure
-or are interested in LLVM qualification.</p>
+<div>
+<p>In addition, many APIs have changed in this release. Some of the major
+ LLVM API changes are:</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>
- <li>The default for <tt>make check</tt> is now to use
- the <a href="http://llvm.org/cmds/lit.html">lit</a> testing tool, which is
- part of LLVM itself. You can use <tt>lit</tt> directly as well, or use
- the <tt>llvm-lit</tt> tool which is created as part of a Makefile or CMake
- build (and knows how to find the appropriate tools). See the <tt>lit</tt>
- documentation and the <a href="http://blog.llvm.org/2009/12/lit-it.html">blog
- post</a>, and <a href="http://llvm.org/bugs/show_bug.cgi?id=5217">PR5217</a>
- for more information.</li>
-
- <li>The LLVM <tt>test-suite</tt> infrastructure has a new "simple" test format
- (<tt>make TEST=simple</tt>). The new format is intended to require only a
- compiler and not a full set of LLVM tools. This makes it useful for testing
- released compilers, for running the test suite with other compilers (for
- performance comparisons), and makes sure that we are testing the compiler as
- users would see it. The new format is also designed to work using reference
- outputs instead of comparison to a baseline compiler, which makes it run much
- faster and makes it less system dependent.</li>
-
- <li>Significant progress has been made on a new interface to running the
- LLVM <tt>test-suite</tt> (aka the LLVM "nightly tests") using
- the <a href="http://llvm.org/docs/lnt">LNT</a> infrastructure. The LNT
- interface to the <tt>test-suite</tt> brings significantly improved reporting
- capabilities for monitoring the correctness and generated code quality
- produced by LLVM over time.</li>
+<!-- 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>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>
<!-- *********************************************************************** -->
-<div class="doc_section">
+<h2>
<a name="knownproblems">Known Problems</a>
-</div>
+</h2>
<!-- *********************************************************************** -->
-<div class="doc_text">
+<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>
-
-</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>
<!-- ======================================================================= -->
-<div class="doc_subsection">
+<h3>
<a name="experimental">Experimental features included with this release</a>
-</div>
+</h3>
-<div class="doc_text">
+<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>
+ 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>
<ul>
-<li>The Alpha, Blackfin, CellSPU, MicroBlaze, MSP430, MIPS, PIC16, SystemZ
- and XCore backends are experimental.</li>
-<li><tt>llc</tt> "<tt>-filetype=obj</tt>" is experimental on all targets
- other than darwin-i386 and darwin-x86_64.</li>
+ <li>The Alpha, Blackfin, CellSPU, MicroBlaze, MSP430, MIPS, PTX, SystemZ 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>
</ul>
</div>
<!-- ======================================================================= -->
-<div class="doc_subsection">
+<h3>
<a name="x86-be">Known problems with the X86 back-end</a>
-</div>
+</h3>
-<div class="doc_text">
+<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>Win64 code generation wasn't widely tested. Everything should work, but we
- expect small issues to happen. Also, llvm-gcc cannot build the mingw64
- runtime currently due to lack of support for the 'u' inline assembly
- constraint and for X87 floating point inline assembly.</li>
+ 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>
+ <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>
<!-- ======================================================================= -->
-<div class="doc_subsection">
+<h3>
<a name="ppc-be">Known problems with the PowerPC back-end</a>
-</div>
+</h3>
-<div class="doc_text">
+<div>
<ul>
-<li>The Linux PPC32/ABI support needs testing for the interpreter and static
-compilation, and lacks support for debug information.</li>
+ <li>The PPC32/ELF support lacks PIC support.</li>
</ul>
</div>
<!-- ======================================================================= -->
-<div class="doc_subsection">
+<h3>
<a name="arm-be">Known problems with the ARM back-end</a>
-</div>
+</h3>
-<div class="doc_text">
+<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>
+ <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>
</div>
<!-- ======================================================================= -->
-<div class="doc_subsection">
+<h3>
<a name="sparc-be">Known problems with the SPARC back-end</a>
-</div>
+</h3>
-<div class="doc_text">
+<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>The SPARC backend only supports the 32-bit SPARC ABI (-m32); it does not
+ support the 64-bit SPARC ABI (-m64).</li>
</ul>
</div>
<!-- ======================================================================= -->
-<div class="doc_subsection">
+<h3>
<a name="mips-be">Known problems with the MIPS back-end</a>
-</div>
+</h3>
-<div class="doc_text">
+<div>
<ul>
-<li>64-bit MIPS targets are not supported yet.</li>
+ <li>64-bit MIPS targets are not supported yet.</li>
</ul>
</div>
<!-- ======================================================================= -->
-<div class="doc_subsection">
+<h3>
<a name="alpha-be">Known problems with the Alpha back-end</a>
-</div>
+</h3>
-<div class="doc_text">
+<div>
<ul>
-
-<li>On 21164s, some rare FP arithmetic sequences which may trap do not have the
-appropriate nops inserted to ensure restartability.</li>
-
+ <li>On 21164s, some rare FP arithmetic sequences which may trap do not have
+ the appropriate nops inserted to ensure restartability.</li>
</ul>
+
</div>
<!-- ======================================================================= -->
-<div class="doc_subsection">
+<h3>
<a name="c-be">Known problems with the C back-end</a>
-</div>
+</h3>
-<div class="doc_text">
+<div>
<p>The C backend has numerous problems and is not being actively maintained.
-Depending on it for anything serious is not advised.</p>
+ Depending on it for anything serious is not advised.</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>
+ <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>
<!-- ======================================================================= -->
-<div class="doc_subsection">
+<h3>
<a name="llvm-gcc">Known problems with the llvm-gcc front-end</a>
-</div>
+</h3>
-<div class="doc_text">
+<div>
+
+<p><b>LLVM 2.9 was 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
<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>
+ actively maintained. If you are interested in Ada, we recommend that you
+ consider using <a href="#dragonegg">dragonegg</a> instead.</p>
+
+</div>
+
</div>
<!-- *********************************************************************** -->
-<div class="doc_section">
+<h2>
<a name="additionalinfo">Additional Information</a>
-</div>
+</h2>
<!-- *********************************************************************** -->
-<div class="doc_text">
+<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>
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