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691 lines
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
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"http://www.w3.org/TR/html4/strict.dtd">
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<meta encoding="utf8">
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<link rel="stylesheet" href="llvm.css" type="text/css">
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<title>LLVM 2.9 Release Notes</title>
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</head>
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<body>
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<div class="doc_title">LLVM 2.9 Release Notes</div>
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<img align=right src="http://llvm.org/img/DragonSmall.png"
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width="136" height="136" alt="LLVM Dragon Logo">
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<ol>
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<li><a href="#intro">Introduction</a></li>
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<li><a href="#subproj">Sub-project Status Update</a></li>
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<li><a href="#externalproj">External Projects Using LLVM 2.9</a></li>
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<li><a href="#whatsnew">What's New in LLVM 2.9?</a></li>
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<li><a href="GettingStarted.html">Installation Instructions</a></li>
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<li><a href="#knownproblems">Known Problems</a></li>
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<li><a href="#additionalinfo">Additional Information</a></li>
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</ol>
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<div class="doc_author">
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<p>Written by the <a href="http://llvm.org">LLVM Team</a></p>
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</div>
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<h1 style="color:red">These are in-progress notes for the upcoming LLVM 2.9
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release.<br>
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You may prefer the
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<a href="http://llvm.org/releases/2.8/docs/ReleaseNotes.html">LLVM 2.8
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Release Notes</a>.</h1>
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<!-- *********************************************************************** -->
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<div class="doc_section">
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<a name="intro">Introduction</a>
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</div>
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<!-- *********************************************************************** -->
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<div class="doc_text">
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<p>This document contains the release notes for the LLVM Compiler
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Infrastructure, release 2.9. Here we describe the status of LLVM, including
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major improvements from the previous release and significant known problems.
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All LLVM releases may be downloaded from the <a
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href="http://llvm.org/releases/">LLVM releases web site</a>.</p>
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<p>For more information about LLVM, including information about the latest
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release, please check out the <a href="http://llvm.org/">main LLVM
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web site</a>. If you have questions or comments, the <a
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href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVM Developer's
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Mailing List</a> is a good place to send them.</p>
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<p>Note that if you are reading this file from a Subversion checkout or the
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main LLVM web page, this document applies to the <i>next</i> release, not the
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current one. To see the release notes for a specific release, please see the
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<a href="http://llvm.org/releases/">releases page</a>.</p>
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</div>
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<!-- NOTE: last release for llvm-gcc -->
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<!--
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Almost dead code.
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lib/Transforms/IPO/MergeFunctions.cpp => consider for 3.0.
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-->
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<!-- Features that need text if they're finished for 3.0:
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combiner-aa?
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strong phi elim
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loop dependence analysis
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TBAA
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CorrelatedValuePropagation
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-->
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<!-- *********************************************************************** -->
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<div class="doc_section">
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<a name="subproj">Sub-project Status Update</a>
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</div>
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<!-- *********************************************************************** -->
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<div class="doc_text">
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<p>
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The LLVM 2.9 distribution currently consists of code from the core LLVM
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repository (which roughly includes the LLVM optimizers, code generators
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and supporting tools), the Clang repository and the llvm-gcc repository. In
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addition to this code, the LLVM Project includes other sub-projects that are in
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development. Here we include updates on these subprojects.
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</p>
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</div>
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<!--=========================================================================-->
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<div class="doc_subsection">
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<a name="clang">Clang: C/C++/Objective-C Frontend Toolkit</a>
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</div>
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<div class="doc_text">
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<p><a href="http://clang.llvm.org/">Clang</a> is an LLVM front end for the C,
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C++, and Objective-C languages. Clang aims to provide a better user experience
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through expressive diagnostics, a high level of conformance to language
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standards, fast compilation, and low memory use. Like LLVM, Clang provides a
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modular, library-based architecture that makes it suitable for creating or
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integrating with other development tools. Clang is considered a
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production-quality compiler for C, Objective-C, C++ and Objective-C++ on x86
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(32- and 64-bit), and for darwin-arm targets.</p>
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<p>In the LLVM 2.9 time-frame, the Clang team has made many improvements:</p>
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<ul>
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</ul>
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</div>
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<!--=========================================================================-->
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<div class="doc_subsection">
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<a name="clangsa">Clang Static Analyzer</a>
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</div>
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<div class="doc_text">
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<p>The <a href="http://clang-analyzer.llvm.org/">Clang Static Analyzer</a>
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project is an effort to use static source code analysis techniques to
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automatically find bugs in C and Objective-C programs (and hopefully <a
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href="http://clang-analyzer.llvm.org/dev_cxx.html">C++ in the
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future</a>!). The tool is very good at finding bugs that occur on specific
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paths through code, such as on error conditions.</p>
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<p>The LLVM 2.9 release...
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</p>
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</div>
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<!--=========================================================================-->
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<div class="doc_subsection">
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<a name="dragonegg">DragonEgg: llvm-gcc ported to gcc-4.5</a>
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</div>
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<div class="doc_text">
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NOTE: This should be written to be self-contained without referencing llvm-gcc.
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<p>
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<a href="http://dragonegg.llvm.org/">DragonEgg</a> is a port of llvm-gcc to
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gcc-4.5. Unlike llvm-gcc, dragonegg in theory does not require any gcc-4.5
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modifications whatsoever (currently one small patch is needed) thanks to the
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new <a href="http://gcc.gnu.org/wiki/plugins">gcc plugin architecture</a>.
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DragonEgg is a gcc plugin that makes gcc-4.5 use the LLVM optimizers and code
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generators instead of gcc's, just like with llvm-gcc.
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</p>
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<p>
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DragonEgg is still a work in progress, but it is able to compile a lot of code,
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for example all of gcc, LLVM and clang. Currently Ada, C, C++ and Fortran work
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well, while all other languages either don't work at all or only work poorly.
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For the moment only the x86-32 and x86-64 targets are supported, and only on
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linux and darwin (darwin may need additional gcc patches).
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</p>
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<p>
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The 2.9 release has the following notable changes:
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<ul>
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</ul>
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</div>
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<!--=========================================================================-->
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<div class="doc_subsection">
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<a name="vmkit">VMKit: JVM Virtual Machine Implementation</a>
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</div>
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<div class="doc_text">
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<p>
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The <a href="http://vmkit.llvm.org/">VMKit project</a> is an implementation of
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a Java Virtual Machine (Java VM or JVM) that uses LLVM for static and
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just-in-time compilation.
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UPDATE.
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</p>
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</div>
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<!--=========================================================================-->
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<div class="doc_subsection">
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<a name="compiler-rt">compiler-rt: Compiler Runtime Library</a>
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</div>
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<div class="doc_text">
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<p>
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The new LLVM <a href="http://compiler-rt.llvm.org/">compiler-rt project</a>
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is a simple library that provides an implementation of the low-level
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target-specific hooks required by code generation and other runtime components.
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For example, when compiling for a 32-bit target, converting a double to a 64-bit
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unsigned integer is compiled into a runtime call to the "__fixunsdfdi"
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function. The compiler-rt library provides highly optimized implementations of
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this and other low-level routines (some are 3x faster than the equivalent
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libgcc routines).</p>
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<p>
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All of the code in the compiler-rt project is available under the standard LLVM
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License, a "BSD-style" license.
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NEW: MIT License as well.
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New in LLVM 2.9, UPDATE</p>
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</div>
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<!--=========================================================================-->
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<div class="doc_subsection">
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<a name="lldb">LLDB: Low Level Debugger</a>
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</div>
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<div class="doc_text">
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<p>
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<a href="http://lldb.llvm.org/">LLDB</a> is a brand new member of the LLVM
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umbrella of projects. LLDB is a next generation, high-performance debugger. It
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is built as a set of reusable components which highly leverage existing
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libraries in the larger LLVM Project, such as the Clang expression parser, the
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LLVM disassembler and the LLVM JIT.</p>
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<p>
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LLDB is in early development and not included as part of the LLVM 2.9 release,
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UPDATE!
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<!--
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but is mature enough to support basic debugging scenarios on Mac OS X in C,
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Objective-C and C++. We'd really like help extending and expanding LLDB to
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support new platforms, new languages, new architectures, and new features.-->
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</p>
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</div>
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<!--=========================================================================-->
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<div class="doc_subsection">
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<a name="libc++">libc++: C++ Standard Library</a>
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</div>
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<div class="doc_text">
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<p>
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<a href="http://libcxx.llvm.org/">libc++</a> is another new member of the LLVM
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family. It is an implementation of the C++ standard library, written from the
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ground up to specifically target the forthcoming C++'0X standard and focus on
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delivering great performance.</p>
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<p>
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As of the LLVM 2.9 release, UPDATE!
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<!--libc++ is virtually feature complete, but would
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benefit from more testing and better integration with Clang++. It is also
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looking forward to the C++ committee finalizing the C++'0x standard.-->
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</p>
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</div>
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<!--=========================================================================-->
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<div class="doc_subsection">
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<a name="klee">KLEE: A Symbolic Execution Virtual Machine</a>
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</div>
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<div class="doc_text">
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<p>
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<a href="http://klee.llvm.org/">KLEE</a> is a symbolic execution framework for
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programs in LLVM bitcode form. KLEE tries to symbolically evaluate "all" paths
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through the application and records state transitions that lead to fault
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states. This allows it to construct testcases that lead to faults and can even
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be used to verify some algorithms.
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</p>
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<p>UPDATE!</p>
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</div>
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|
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<!-- *********************************************************************** -->
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<div class="doc_section">
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<a name="externalproj">External Open Source Projects Using LLVM 2.9</a>
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</div>
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<!-- *********************************************************************** -->
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<div class="doc_text">
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<p>An exciting aspect of LLVM is that it is used as an enabling technology for
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a lot of other language and tools projects. This section lists some of the
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projects that have already been updated to work with LLVM 2.9.</p>
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</div>
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<!-- *********************************************************************** -->
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<div class="doc_section">
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<a name="whatsnew">What's New in LLVM 2.9?</a>
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</div>
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<!-- *********************************************************************** -->
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<div class="doc_text">
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<p>This release includes a huge number of bug fixes, performance tweaks and
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minor improvements. Some of the major improvements and new features are listed
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in this section.
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</p>
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</div>
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<!--=========================================================================-->
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<div class="doc_subsection">
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<a name="majorfeatures">Major New Features</a>
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</div>
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<div class="doc_text">
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<p>LLVM 2.9 includes several major new capabilities:</p>
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<ul>
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</ul>
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</div>
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<!--=========================================================================-->
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<div class="doc_subsection">
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<a name="coreimprovements">LLVM IR and Core Improvements</a>
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</div>
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<div class="doc_text">
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<p>LLVM IR has several new features for better support of new targets and that
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expose new optimization opportunities:</p>
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<ul>
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</ul>
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</div>
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<!--=========================================================================-->
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<div class="doc_subsection">
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<a name="optimizer">Optimizer Improvements</a>
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</div>
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<div class="doc_text">
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<p>In addition to a large array of minor performance tweaks and bug fixes, this
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release includes a few major enhancements and additions to the optimizers:</p>
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<ul>
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TBAA.
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</ul>
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<!--
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<p>In addition to these features that are done in 2.8, there is preliminary
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support in the release for Type Based Alias Analysis
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Preliminary work on TBAA but not usable in 2.8.
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New CorrelatedValuePropagation pass, not on by default in 2.8 yet.
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-->
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</div>
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<!--=========================================================================-->
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<div class="doc_subsection">
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<a name="mc">MC Level Improvements</a>
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</div>
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<div class="doc_text">
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<p>
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The LLVM Machine Code (aka MC) subsystem was created to solve a number
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of problems in the realm of assembly, disassembly, object file format handling,
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and a number of other related areas that CPU instruction-set level tools work
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in.</p>
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<ul>
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ELF/COFF support?
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</ul>
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<p>For more information, please see the <a
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href="http://blog.llvm.org/2010/04/intro-to-llvm-mc-project.html">Intro to the
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LLVM MC Project Blog Post</a>.
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</p>
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</div>
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<!--=========================================================================-->
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<div class="doc_subsection">
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<a name="codegen">Target Independent Code Generator Improvements</a>
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</div>
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<div class="doc_text">
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<p>We have put a significant amount of work into the code generator
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infrastructure, which allows us to implement more aggressive algorithms and make
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it run faster:</p>
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<ul>
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<!-- SplitKit -->
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FastISel for ARM.
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</ul>
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</div>
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<!--=========================================================================-->
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<div class="doc_subsection">
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<a name="x86">X86-32 and X86-64 Target Improvements</a>
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</div>
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<div class="doc_text">
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<p>New features and major changes in the X86 target include:
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</p>
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<ul>
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</ul>
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</div>
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<!--=========================================================================-->
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<div class="doc_subsection">
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<a name="ARM">ARM Target Improvements</a>
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</div>
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<div class="doc_text">
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<p>New features of the ARM target include:
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</p>
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<ul>
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</ul>
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</div>
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|
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|
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<!--=========================================================================-->
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<div class="doc_subsection">
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<a name="changes">Major Changes and Removed Features</a>
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</div>
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<div class="doc_text">
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<p>If you're already an LLVM user or developer with out-of-tree changes based
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on LLVM 2.8, this section lists some "gotchas" that you may run into upgrading
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from the previous release.</p>
|
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<ul>
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</ul>
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|
|
|
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<p>In addition, many APIs have changed in this release. Some of the major LLVM
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API changes are:</p>
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<ul>
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</ul>
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|
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</div>
|
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|
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<!--=========================================================================-->
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<div class="doc_subsection">
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<a name="devtree_changes">Development Infrastructure Changes</a>
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</div>
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<div class="doc_text">
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<p>This section lists changes to the LLVM development infrastructure. This
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mostly impacts users who actively work on LLVM or follow development on
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mainline, but may also impact users who leverage the LLVM build infrastructure
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or are interested in LLVM qualification.</p>
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|
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<ul>
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</ul>
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</div>
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<!-- *********************************************************************** -->
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<div class="doc_section">
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<a name="knownproblems">Known Problems</a>
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</div>
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<!-- *********************************************************************** -->
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<div class="doc_text">
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<p>This section contains significant known problems with the LLVM system,
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listed by component. If you run into a problem, please check the <a
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href="http://llvm.org/bugs/">LLVM bug database</a> and submit a bug if
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there isn't already one.</p>
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</div>
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|
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<!-- ======================================================================= -->
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<div class="doc_subsection">
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<a name="experimental">Experimental features included with this release</a>
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</div>
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<div class="doc_text">
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<p>The following components of this LLVM release are either untested, known to
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be broken or unreliable, or are in early development. These components should
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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
|
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components, please contact us on the <a
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href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVMdev list</a>.</p>
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<ul>
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<li>The Alpha, Blackfin, CellSPU, MicroBlaze, MSP430, MIPS, PTX, SystemZ
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and XCore backends are experimental.</li>
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<li><tt>llc</tt> "<tt>-filetype=obj</tt>" is experimental on all targets
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other than darwin-i386 and darwin-x86_64. FIXME: Not true on ELF anymore?</li>
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</ul>
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</div>
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<!-- ======================================================================= -->
|
|
<div class="doc_subsection">
|
|
<a name="x86-be">Known problems with the X86 back-end</a>
|
|
</div>
|
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|
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<div class="doc_text">
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<ul>
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<li>The X86 backend does not yet support
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all <a href="http://llvm.org/PR879">inline assembly that uses the X86
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floating point stack</a>. It supports the 'f' and 't' constraints, but not
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'u'.</li>
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<li>Win64 code generation wasn't widely tested. Everything should work, but we
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expect small issues to happen. Also, llvm-gcc cannot build the mingw64
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runtime currently due to lack of support for the 'u' inline assembly
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constraint and for X87 floating point inline assembly.</li>
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|
<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>
|
|
</ul>
|
|
|
|
</div>
|
|
|
|
<!-- ======================================================================= -->
|
|
<div class="doc_subsection">
|
|
<a name="ppc-be">Known problems with the PowerPC back-end</a>
|
|
</div>
|
|
|
|
<div class="doc_text">
|
|
|
|
<ul>
|
|
<li>The Linux PPC32/ABI support needs testing for the interpreter and static
|
|
compilation, and lacks support for debug information.</li>
|
|
</ul>
|
|
|
|
</div>
|
|
|
|
<!-- ======================================================================= -->
|
|
<div class="doc_subsection">
|
|
<a name="arm-be">Known problems with the ARM back-end</a>
|
|
</div>
|
|
|
|
<div class="doc_text">
|
|
|
|
<ul>
|
|
<li>Thumb mode works only on ARMv6 or higher processors. On sub-ARMv6
|
|
processors, thumb programs can crash or produce wrong
|
|
results (<a href="http://llvm.org/PR1388">PR1388</a>).</li>
|
|
<li>Compilation for ARM Linux OABI (old ABI) is supported but not fully tested.
|
|
</li>
|
|
</ul>
|
|
|
|
</div>
|
|
|
|
<!-- ======================================================================= -->
|
|
<div class="doc_subsection">
|
|
<a name="sparc-be">Known problems with the SPARC back-end</a>
|
|
</div>
|
|
|
|
<div class="doc_text">
|
|
|
|
<ul>
|
|
<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">
|
|
<a name="mips-be">Known problems with the MIPS back-end</a>
|
|
</div>
|
|
|
|
<div class="doc_text">
|
|
|
|
<ul>
|
|
<li>64-bit MIPS targets are not supported yet.</li>
|
|
</ul>
|
|
|
|
</div>
|
|
|
|
<!-- ======================================================================= -->
|
|
<div class="doc_subsection">
|
|
<a name="alpha-be">Known problems with the Alpha back-end</a>
|
|
</div>
|
|
|
|
<div class="doc_text">
|
|
|
|
<ul>
|
|
|
|
<li>On 21164s, some rare FP arithmetic sequences which may trap do not have the
|
|
appropriate nops inserted to ensure restartability.</li>
|
|
|
|
</ul>
|
|
</div>
|
|
|
|
<!-- ======================================================================= -->
|
|
<div class="doc_subsection">
|
|
<a name="c-be">Known problems with the C back-end</a>
|
|
</div>
|
|
|
|
<div class="doc_text">
|
|
|
|
<p>The C backend has numerous problems and is not being actively maintained.
|
|
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>
|
|
</ul>
|
|
|
|
</div>
|
|
|
|
|
|
<!-- ======================================================================= -->
|
|
<div class="doc_subsection">
|
|
<a name="llvm-gcc">Known problems with the llvm-gcc front-end</a>
|
|
</div>
|
|
|
|
<div class="doc_text">
|
|
|
|
<p>llvm-gcc is generally very stable for the C family of languages. The only
|
|
major language feature of GCC not supported by llvm-gcc is the
|
|
<tt>__builtin_apply</tt> family of builtins. However, some extensions
|
|
are only supported on some targets. For example, trampolines are only
|
|
supported on some targets (these are used when you take the address of a
|
|
nested function).</p>
|
|
|
|
<p>Fortran support generally works, but there are still several unresolved bugs
|
|
in <a href="http://llvm.org/bugs/">Bugzilla</a>. Please see the
|
|
tools/gfortran component for details. Note that llvm-gcc is missing major
|
|
Fortran performance work in the frontend and library that went into GCC after
|
|
4.2. If you are interested in Fortran, we recommend that you consider using
|
|
<a href="#dragonegg">dragonegg</a> instead.</p>
|
|
|
|
<p>The llvm-gcc 4.2 Ada compiler has basic functionality, but is no longer being
|
|
actively maintained. If you are interested in Ada, we recommend that you
|
|
consider using <a href="#dragonegg">dragonegg</a> instead.</p>
|
|
</div>
|
|
|
|
<!-- *********************************************************************** -->
|
|
<div class="doc_section">
|
|
<a name="additionalinfo">Additional Information</a>
|
|
</div>
|
|
<!-- *********************************************************************** -->
|
|
|
|
<div class="doc_text">
|
|
|
|
<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>
|
|
|
|
</div>
|
|
|
|
<!-- *********************************************************************** -->
|
|
|
|
<hr>
|
|
<address>
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<a href="http://llvm.org/">LLVM Compiler Infrastructure</a><br>
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