mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-24 03:33:20 +01:00
f61d49df40
through the use of 'fpmath' metadata. Currently this only provides a 'fpaccuracy' value, which may be a number in ULPs or the keyword 'fast', however the intent is that this will be extended with additional information about NaN's, infinities etc later. No optimizations have been hooked up to this so far. llvm-svn: 154822
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646 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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<link rel="stylesheet" href="llvm.css" type="text/css">
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<title>LLVM 3.1 Release Notes</title>
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</head>
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<body>
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<h1>LLVM 3.1 Release Notes</h1>
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<div>
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<img style="float:right" src="http://llvm.org/img/DragonSmall.png"
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width="136" height="136" alt="LLVM Dragon Logo">
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</div>
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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 3.1</a></li>
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<li><a href="#whatsnew">What's New in LLVM?</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 3.1
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release.<br>
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You may prefer the
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<a href="http://llvm.org/releases/3.0/docs/ReleaseNotes.html">LLVM 3.0
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Release Notes</a>.</h1>
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<!-- *********************************************************************** -->
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<h2>
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<a name="intro">Introduction</a>
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</h2>
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<!-- *********************************************************************** -->
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<div>
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<p>This document contains the release notes for the LLVM Compiler
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Infrastructure, release 3.1. Here we describe the status of LLVM, including
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major improvements from the previous release, improvements in various
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subprojects of LLVM, and some of the current users of the code.
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All LLVM releases may be downloaded from
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the <a 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 web
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site</a>. If you have questions or comments,
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the <a href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVM
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Developer's 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 main
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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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<!-- *********************************************************************** -->
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<h2>
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<a name="subproj">Sub-project Status Update</a>
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</h2>
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<!-- *********************************************************************** -->
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<div>
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<p>The LLVM 3.1 distribution currently consists of code from the core LLVM
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repository (which roughly includes the LLVM optimizers, code generators and
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supporting tools), and the Clang repository. In
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addition to this code, the LLVM Project includes other sub-projects that are
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in development. Here we include updates on these subprojects.</p>
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<!--=========================================================================-->
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<h3>
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<a name="clang">Clang: C/C++/Objective-C Frontend Toolkit</a>
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</h3>
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<div>
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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
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experience through expressive diagnostics, a high level of conformance to
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language standards, fast compilation, and low memory use. Like LLVM, Clang
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provides a modular, library-based architecture that makes it suitable for
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creating or 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 3.1 time-frame, the Clang team has made many improvements:</p>
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<ul>
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<li>...</li>
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</ul>
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<p>For more details about the changes to Clang since the 2.9 release, see the
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<a href="http://clang.llvm.org/docs/ReleaseNotes.html">Clang release notes</a>
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</p>
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<p>If Clang rejects your code but another compiler accepts it, please take a
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look at the <a href="http://clang.llvm.org/compatibility.html">language
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compatibility</a> guide to make sure this is not intentional or a known
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issue.</p>
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</div>
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<!--=========================================================================-->
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<h3>
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<a name="dragonegg">DragonEgg: GCC front-ends, LLVM back-end</a>
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</h3>
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<div>
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<p><a href="http://dragonegg.llvm.org/">DragonEgg</a> is a
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<a href="http://gcc.gnu.org/wiki/plugins">gcc plugin</a> that replaces GCC's
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optimizers and code generators with LLVM's. It works with gcc-4.5 or gcc-4.6,
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targets the x86-32 and x86-64 processor families, and has been successfully
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used on the Darwin, FreeBSD, KFreeBSD, Linux and OpenBSD platforms. It fully
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supports Ada, C, C++ and Fortran. It has partial support for Go, Java, Obj-C
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and Obj-C++.</p>
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<p>The 3.1 release has the following notable changes:</p>
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<ul>
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<li>...</li>
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</ul>
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</div>
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<!--=========================================================================-->
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<h3>
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<a name="compiler-rt">compiler-rt: Compiler Runtime Library</a>
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</h3>
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<div>
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<p>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
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components. For example, when compiling for a 32-bit target, converting a
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double to a 64-bit unsigned integer is compiled into a runtime call to the
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"__fixunsdfdi" function. The compiler-rt library provides highly optimized
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implementations of this and other low-level routines (some are 3x faster than
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the equivalent libgcc routines).</p>
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<p>....</p>
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</div>
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<!--=========================================================================-->
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<h3>
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<a name="lldb">LLDB: Low Level Debugger</a>
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</h3>
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<div>
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<p>LLDB is a ground-up implementation of a command line debugger, as well as a
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debugger API that can be used from other applications. LLDB makes use of the
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Clang parser to provide high-fidelity expression parsing (particularly for
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C++) and uses the LLVM JIT for target support.</p>
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<p>...</p>
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</div>
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<!--=========================================================================-->
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<h3>
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<a name="libc++">libc++: C++ Standard Library</a>
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</h3>
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<div>
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<p>Like compiler_rt, libc++ is now <a href="DeveloperPolicy.html#license">dual
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licensed</a> under the MIT and UIUC license, allowing it to be used more
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permissively.</p>
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<p>...</p>
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</div>
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<!--=========================================================================-->
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<h3>
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<a name="vmkit">VMKit</a>
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</h3>
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<div>
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<p>The <a href="http://vmkit.llvm.org/">VMKit project</a> is an
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implementation of a Java Virtual Machine (Java VM or JVM) that uses LLVM for
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static and just-in-time compilation.
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<p>In the LLVM 3.1 time-frame, VMKit has had significant improvements on both
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runtime and startup performance:</p>
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<ul>
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<li>...</li>
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</ul>
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</div>
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</div>
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<!-- *********************************************************************** -->
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<h2>
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<a name="externalproj">External Open Source Projects Using LLVM 3.1</a>
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</h2>
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<!-- *********************************************************************** -->
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<div>
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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 3.1.</p>
|
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|
|
... to be filled in right before the release ...
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</div>
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<!-- *********************************************************************** -->
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<h2>
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<a name="whatsnew">What's New in LLVM 3.1?</a>
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</h2>
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<!-- *********************************************************************** -->
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<div>
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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
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listed in this section.</p>
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<!--=========================================================================-->
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<h3>
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<a name="majorfeatures">Major New Features</a>
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</h3>
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<div>
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<!-- Features that need text if they're finished for 3.1:
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ARM EHABI
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combiner-aa?
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strong phi elim
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loop dependence analysis
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CorrelatedValuePropagation
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lib/Transforms/IPO/MergeFunctions.cpp => consider for 3.1.
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Integrated assembler on by default for arm/thumb?
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-->
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<!-- Near dead:
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Analysis/RegionInfo.h + Dom Frontiers
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SparseBitVector: used in LiveVar.
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llvm/lib/Archive - replace with lib object?
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-->
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<p>LLVM 3.1 includes several major changes and big features:</p>
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<ul>
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<li><a href="../tools/clang/docs/AddressSanitizer.html">AddressSanitizer</a>,
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a fast memory error detector.</li>
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<li><a href="CodeGenerator.html#machineinstrbundle">MachineInstr Bundles</a>,
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Support to model instruction bundling / packing.</li>
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<li><a href="#armintegratedassembler">ARM Integrated Assembler</a>,
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A full featured assembler and direct-to-object support for ARM.</li>
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<li>....</li>
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</ul>
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</div>
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<!--=========================================================================-->
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<h3>
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<a name="coreimprovements">LLVM IR and Core Improvements</a>
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</h3>
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<div>
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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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<li>IR support for half float</li>
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<li>IR support for vectors of pointers, including vector GEPs.</li>
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<li>Module flags have been introduced. They convey information about the
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module as a whole to LLVM subsystems.</li>
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<li>Loads can now have range metadata attached to them to describe the
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possible values being loaded.</li>
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<li>....</li>
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</ul>
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</div>
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<!--=========================================================================-->
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<h3>
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<a name="optimizer">Optimizer Improvements</a>
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</h3>
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<div>
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<p>In addition to many minor performance tweaks and bug fixes, this
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release includes a few major enhancements and additions to the
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optimizers:</p>
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<ul>
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<li>The loop unroll pass now is able to unroll loops with run-time trip counts.
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This feature is turned off by default, and is enabled with the
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<code>-unroll-runtime</code> flag.</li>
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<li>A new basic-block autovectorization pass is available. Pass
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<code>-vectorize</code> to run this pass along with some associated
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post-vectorization cleanup passes.</li>
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<li>....</li>
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</ul>
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</div>
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<!--=========================================================================-->
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<h3>
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<a name="mc">MC Level Improvements</a>
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</h3>
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<div>
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<p>The LLVM Machine Code (aka MC) subsystem was created to solve a number of
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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. For more information, please see
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the <a href="http://blog.llvm.org/2010/04/intro-to-llvm-mc-project.html">Intro
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to the LLVM MC Project Blog Post</a>.</p>
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<ul>
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<li>....</li>
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</ul>
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</div>
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<!--=========================================================================-->
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<h3>
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<a name="codegen">Target Independent Code Generator Improvements</a>
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</h3>
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<div>
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<p>We have changed the way that the Type Legalizer legalizes vectors. The type
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legalizer now attempts to promote integer elements. This enabled the
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implementation of vector-select. Additionally, we see a performance boost on
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workloads which use vectors of chars and shorts, since they are now promoted
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to 32-bit types, which are better supported by the SIMD instruction set.
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Floating point types are still widened as before.</p>
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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
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make it run faster:</p>
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<ul>
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<li>TableGen can now synthesize register classes that are only needed to
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represent combinations of constraints from instructions and sub-registers.
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The synthetic register classes inherit most of their properties form their
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closest user-defined super-class.</li>
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<li><code>MachineRegisterInfo</code> now allows the reserved registers to be
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frozen when register allocation starts. Target hooks should use the
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<code>MRI->canReserveReg(FramePtr)</code> method to avoid accidentally
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disabling frame pointer elimination during register allocation.</li>
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<li>A new kind of <code>MachineOperand</code> provides a compact
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representation of large clobber lists on call instructions. The register
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mask operand references a bit mask of preserved registers. Everything else
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is clobbered.</li>
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</ul>
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<p> We added new TableGen infrastructure to support bundling for
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Very Long Instruction Word (VLIW) architectures. TableGen can now
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automatically generate a deterministic finite automaton from a VLIW
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target's schedule description which can be queried to determine
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legal groupings of instructions in a bundle.</p>
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<p> We have added a new target independent VLIW packetizer based on the
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DFA infrastructure to group machine instructions into bundles.</p>
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</div>
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<!--=========================================================================-->
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<h3>
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<a name="x86">X86-32 and X86-64 Target Improvements</a>
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</h3>
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<div>
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<p>New features and major changes in the X86 target include:</p>
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<ul>
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<li>Bug fixes and improved support for AVX1</li>
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<li>Support for AVX2 (still incomplete at this point)</li>
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<li>Call instructions use the new register mask operands for faster compile
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times and better support for different calling conventions. The old WINCALL
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instructions are no longer needed.</li>
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<li>DW2 Exception Handling is enabled on Cygwin and MinGW.</li>
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<li>Support for implicit TLS model used with MS VC runtime</li>
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</ul>
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</div>
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<!--=========================================================================-->
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<h3>
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<a name="ARM">ARM Target Improvements</a>
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</h3>
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<div>
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<p>New features of the ARM target include:</p>
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<ul>
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<li>The constant island pass now supports basic block and constant pool entry
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alignments greater than 4 bytes.</li>
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<li>On Darwin, the ARM target now has a full-featured integrated assembler.
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</li>
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</ul>
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<h4>
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<a name="armintegratedassembler">ARM Integrated Assembler</a>
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</h4>
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<div>
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<p>The ARM target now includes a full featured macro assembler, including
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direct-to-object module support for clang. The assembler is currently enabled
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by default for Darwin only pending testing and any additional necessary
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platform specific support for Linux.</p>
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<p>Full support is included for Thumb1, Thumb2 and ARM modes, along with
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subtarget and CPU specific extensions for VFP2, VFP3 and NEON.</p>
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<p>The assembler is Unified Syntax only (see ARM Architecural Reference Manual
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for details). While there is some, and growing, support for pre-unfied (divided)
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syntax, there are still significant gaps in that support.</p>
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</div>
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|
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</div>
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<!--=========================================================================-->
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<h3>
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<a name="MIPS">MIPS Target Improvements</a>
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</h3>
|
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|
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<div>
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<p>This release has seen major new work on just about every aspect of the MIPS
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backend. Some of the major new features include:</p>
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<ul>
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<li>....</li>
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</ul>
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</div>
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<!--=========================================================================-->
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<h3>
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<a name="OtherTS">Other Target Specific Improvements</a>
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</h3>
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|
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<div>
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<p>Support for Qualcomm's Hexagon VLIW processor has been added.</p>
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|
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<ul>
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<li>....</li>
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|
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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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<h3>
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<a name="changes">Major Changes and Removed Features</a>
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</h3>
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|
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<div>
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<p>If you're already an LLVM user or developer with out-of-tree changes based on
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LLVM 3.1, 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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<li>LLVM 3.1 removes support for reading LLVM 2.9 bitcode files. Going
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forward, we aim for all future versions of LLVM to read bitcode files and
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<tt>.ll</tt> files produced by LLVM 3.0 and later.</li>
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<li>The <tt>unwind</tt> instruction is now gone. With the introduction of the
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new exception handling system in LLVM 3.0, the <tt>unwind</tt> instruction
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became obsolete.</li>
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<li>Floating point instructions can be annotated with <tt>fpmath</tt> metadata
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to indicate relaxed precision requirements, such as those corresponding to
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"fast math".</li>
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<li>....</li>
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</ul>
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</div>
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|
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<!--=========================================================================-->
|
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<h3>
|
|
<a name="api_changes">Internal API Changes</a>
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</h3>
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|
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<div>
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<p>In addition, many APIs have changed in this release. Some of the major
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LLVM API changes are:</p>
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<ul>
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<li>Target specific options have been moved from global variables to members
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on the new <code>TargetOptions</code> class, which is local to each
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<code>TargetMachine</code>. As a consequence, the associated flags will
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no longer be accepted by <tt>clang -mllvm</tt>. This includes:
|
|
<ul>
|
|
<li><code>llvm::PrintMachineCode</code></li>
|
|
<li><code>llvm::NoFramePointerElim</code></li>
|
|
<li><code>llvm::NoFramePointerElimNonLeaf</code></li>
|
|
<li><code>llvm::DisableFramePointerElim(const MachineFunction &)</code></li>
|
|
<li><code>llvm::LessPreciseFPMADOption</code></li>
|
|
<li><code>llvm::LessPrecideFPMAD()</code></li>
|
|
<li><code>llvm::NoExcessFPPrecision</code></li>
|
|
<li><code>llvm::UnsafeFPMath</code></li>
|
|
<li><code>llvm::NoInfsFPMath</code></li>
|
|
<li><code>llvm::NoNaNsFPMath</code></li>
|
|
<li><code>llvm::HonorSignDependentRoundingFPMathOption</code></li>
|
|
<li><code>llvm::HonorSignDependentRoundingFPMath()</code></li>
|
|
<li><code>llvm::UseSoftFloat</code></li>
|
|
<li><code>llvm::FloatABIType</code></li>
|
|
<li><code>llvm::NoZerosInBSS</code></li>
|
|
<li><code>llvm::JITExceptionHandling</code></li>
|
|
<li><code>llvm::JITEmitDebugInfo</code></li>
|
|
<li><code>llvm::JITEmitDebugInfoToDisk</code></li>
|
|
<li><code>llvm::GuaranteedTailCallOpt</code></li>
|
|
<li><code>llvm::StackAlignmentOverride</code></li>
|
|
<li><code>llvm::RealignStack</code></li>
|
|
<li><code>llvm::DisableJumpTables</code></li>
|
|
<li><code>llvm::EnableFastISel</code></li>
|
|
<li><code>llvm::getTrapFunctionName()</code></li>
|
|
<li><code>llvm::EnableSegmentedStacks</code></li>
|
|
</ul></li>
|
|
<li>The MDBuilder class has been added to simplify the creation of
|
|
metadata.</li>
|
|
<li>....</li>
|
|
</ul>
|
|
|
|
</div>
|
|
|
|
<!--=========================================================================-->
|
|
<h3>
|
|
<a name="tools_changes">Tools Changes</a>
|
|
</h3>
|
|
|
|
<div>
|
|
|
|
<p>In addition, some tools have changed in this release. Some of the changes
|
|
are:</p>
|
|
|
|
|
|
<ul>
|
|
<li>llvm-stress is a command line tool for generating random .ll files to fuzz
|
|
different LLVM components. </li>
|
|
<li>....</li>
|
|
</ul>
|
|
|
|
<ul>
|
|
<li>....</li>
|
|
</ul>
|
|
|
|
</div>
|
|
|
|
</div>
|
|
|
|
<!-- *********************************************************************** -->
|
|
<h2>
|
|
<a name="knownproblems">Known Problems</a>
|
|
</h2>
|
|
<!-- *********************************************************************** -->
|
|
|
|
<div>
|
|
|
|
<p>LLVM is generally a production quality compiler, and is used by a broad range
|
|
of applications and shipping in many products. That said, not every
|
|
subsystem is as mature as the aggregate, particularly the more obscure
|
|
targets. If you run into a problem, please check the <a
|
|
href="http://llvm.org/bugs/">LLVM bug database</a> and submit a bug if
|
|
there isn't already one or ask on the <a
|
|
href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVMdev
|
|
list</a>.</p>
|
|
|
|
<p>Known problem areas include:</p>
|
|
|
|
<ul>
|
|
<li>The Alpha, Blackfin, CellSPU, MSP430, PTX, SystemZ and
|
|
XCore backends are experimental, and the Alpha, Blackfin and SystemZ
|
|
targets have already been removed from mainline.</li>
|
|
|
|
<li>The integrated assembler, disassembler, and JIT is not supported by
|
|
several targets. If an integrated assembler is not supported, then a
|
|
system assembler is required. For more details, see the <a
|
|
href="CodeGenerator.html#targetfeatures">Target Features Matrix</a>.
|
|
</li>
|
|
|
|
<li>The C backend has numerous problems and is not being actively maintained.
|
|
Depending on it for anything serious is not advised.</li>
|
|
</ul>
|
|
|
|
</div>
|
|
|
|
<!-- *********************************************************************** -->
|
|
<h2>
|
|
<a name="additionalinfo">Additional Information</a>
|
|
</h2>
|
|
<!-- *********************************************************************** -->
|
|
|
|
<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>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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|
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src="http://jigsaw.w3.org/css-validator/images/vcss-blue" alt="Valid CSS"></a>
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src="http://www.w3.org/Icons/valid-html401-blue" alt="Valid HTML 4.01"></a>
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<a href="http://llvm.org/">LLVM Compiler Infrastructure</a><br>
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Last modified: $Date$
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</address>
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