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detailing. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@57457 91177308-0d34-0410-b5e6-96231b3b80d8
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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 2.4 Release Notes</title>
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</head>
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<body>
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<div class="doc_title">LLVM 2.4 Release Notes</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="#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="#portability">Portability and Supported Platforms</a></li>
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<li><a href="#knownproblems">Known Problems</a>
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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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<!-- *********************************************************************** -->
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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 2.4. 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://mail.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVM Developer's Mailing
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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 releases, 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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<!-- Unfinished features in 2.4:
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Machine LICM
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Machine Sinking
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LegalizeDAGTypes
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llc -enable-value-prop, propagation of value info (sign/zero ext info) from
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one MBB to another
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-->
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<!-- for announcement email:
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mention dev mtg
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Xcode 3.1 and 3.1.1.
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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 2.4 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 llvm-gcc repository. In addition to this code, the
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LLVM Project includes other sub-projects that are in development. The two which
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are the most actively developed are the <a href="#clang">Clang Project</a> and
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the <a href="#vmkit">vmkit Project</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="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>The <a href="http://clang.llvm.org/">Clang project</a> is an effort to build
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a set of new 'LLVM native' front-end technologies for the LLVM optimizer
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and code generator. Clang is continuing to make major strides forward in all
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areas. Its C and Objective-C parsing support is very solid, and the code
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generation support is far enough along to build many C applications. While not
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yet production quality, it is progressing very nicely. In addition, C++
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front-end work has started to make significant progress.</p>
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<p>Codegen progress/state
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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="clangsa">Clang Static Analyzer</a>
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</div>
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<div class="doc_text">
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<p>The
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<a href="http://clang.llvm.org/StaticAnalysis.html">static analysis tool</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="vmkit">vmkit: JVM/CLI 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 JVM and a CLI Virtual Machines (Microsoft .NET is an
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implementation of the CLI) using the Just-In-Time compiler of LLVM.</p>
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<p>...</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?</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 2.4 includes several major new capabilities:</p>
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<ul>
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<li>
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<p>MRVs got generalized to FCAs. getresult is gone, ret with multiple values
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is gone.</p>
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</li>
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<li><p>-O0 compile times overall much faster</p></li>
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<li><p>Attrs changes?</p></li>
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<li><p>Initial PIC16 port</p></li>
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<li><p> Support the rest of the atomic __sync builtins</p></li>
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<li><p>...</p></li>
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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="llvm-gcc">llvm-gcc 4.2 Improvements</a>
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</div>
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<div class="doc_text">
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<p>LLVM 2.4 fully supports the llvm-gcc 4.2 front-end, and includes support
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for the C, C++, Objective-C, Ada, and Fortran front-ends.</p>
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<p>
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<ul>
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<li>block-pointers<li>
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<li>alpha?<li>
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<li>-flimited-precision</li>
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<li>-flto</li>
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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 Core Improvements</a>
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</div>
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<div class="doc_text">
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<p>New features include:
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</p>
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<ul>
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<li>vector shifts in the IR: no codegen support yet</li>
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<li>use diet patch landed: saved 15% IR memory footprint</li>
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<li>LLVM IR now directly represents "common" linkage, instead of
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representing it as a form of weak linkage.</li>
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<li>DebugInfoBuilder</li>
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<li>.ll printing format change: %3 = add i32 4, 2</li>
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<li>opt-size, noinline, alwaysinline function attributes</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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<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 huge array of bug fixes and minor performance tweaks, the
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LLVM 2.4 optimizers support a few major enhancements:</p>
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<ul>
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<li>GVN now does local PRE?</li>
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<li>Matthijs' Dead argument elimination rewrite</li>
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<li>Old-ADCE used control dependence and deleted output-free infinite loops.
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Added a new Loop deletion pass (for deleting output free provably-finite loops)
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and rewrote ADCE to be simpler faster, and not need control dependence.</li>
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<li>SparsePropagation framework for lattice-based dataflow solvers.</li>
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<li>Tail duplication was removed from the standard optimizer sequence.</li>
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<li>Various helper functions (ComputeMaskedBits, ComputeNumSignBits, etc) were
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pulled out of instcombine and put into a new ValueTracking.h file, where they
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can be reused by other passes.</li>
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<li>MarkModRef etc</li>
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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="codegen">Code Generator Improvements</a>
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</div>
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<div class="doc_text">
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<p>We put a significant amount of work into the code generator infrastructure,
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which allows us to implement more aggressive algorithms and make it run
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faster:</p>
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<ul>
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<li>asm writers split out to their own library to avoid JITs having to link
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them in.</li>
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<li>Big asm writer refactoring + TargetAsmInfo</li>
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<li>2-addr pass and coalescer can now remat trivial insts to avoid a copy.</li>
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<li>spiller to commute instructions in order to fold a reload</li>
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<li>Stack slot coloring?</li>
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<li>Live intervals renumbering? Is this useful to external people?</li>
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<li>'is as cheap as a move' instruction flag</li>
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<li>Improvements to selection dag viewing</li>
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<li>fast isel</li>
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<li>Selection dag speedups</li>
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<li>asmwriter + raw_ostream -> fastah</li>
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<li>Partitioned Boolean Quadratic Programming (PBQP) based register
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allocator.</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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<div class="doc_subsection">
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<a name="x86specific">X86/X86-64 Specific Improvements</a>
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</div>
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<div class="doc_text">
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<p>New target-specific features include:
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</p>
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<ul>
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<li>Exception handling is supported by default on Linux/x86-64.</li>
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<li>Position Independent Code (PIC) is now supported on Linux/x86-64.</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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<div class="doc_subsection">
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<a name="targetspecific">Other Target Specific Improvements</a>
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</div>
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<div class="doc_text">
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<p>New target-specific features include:
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</p>
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<ul>
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<li>MIPS floating point support?</li>
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<li>PowerPC now supports trampolines.</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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<div class="doc_subsection">
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<a name="otherimprovements">Other Improvements</a>
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</div>
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<div class="doc_text">
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<p>New features include:
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</p>
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<ul>
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<li><tt>llvmc2</tt> (the generic compiler driver) gained plugin
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support. It is now easier to experiment with <tt>llvmc2</tt> and
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build your own tools based on it. </li>
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<li>raw_ostream + formatting</li>
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<li>Recycler + pool allocation stuff?</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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<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, this section lists some "gotchas" that you
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may run into upgrading from the previous release.</p>
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<p>The LLVM IR generated by llvm-gcc no longer names all instructions.
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Use the instnamer pass if you want everything named.</p>
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<li>The LoadVN and GCSE passes have been removed.</li>
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<p>LLVM API Changes:</p>
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<ul>
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<li>... Attributes changes ... </li>
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<li>The <tt>DbgStopPointInst</tt> methods <tt>getDirectory</tt> and
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<tt>getFileName</tt> now return <tt>Value*</tt> instead of strings. These can be
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converted to strings using <tt>llvm::GetConstantStringInfo</tt> defined via
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"llvm/Analysis/ValueTracking.h".</li>
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<li>API change: BinaryOperator::create -> Create (CmpInst, CastInst too)</li>
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<li>Various header files like "llvm/ADT/iterator" were given a .h suffix.
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Change your code to #include "llvm/ADT/iterator.h" instead.</li>
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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="portability">Portability and Supported Platforms</a>
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</div>
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<!-- *********************************************************************** -->
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<div class="doc_text">
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<p>LLVM is known to work on the following platforms:</p>
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<ul>
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<li>Intel and AMD machines (IA32) running Red Hat Linux, Fedora Core and FreeBSD
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(and probably other unix-like systems).</li>
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<li>PowerPC and X86-based Mac OS X systems, running 10.3 and above in 32-bit and
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64-bit modes.</li>
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<li>Intel and AMD machines running on Win32 using MinGW libraries (native).</li>
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<li>Intel and AMD machines running on Win32 with the Cygwin libraries (limited
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support is available for native builds with Visual C++).</li>
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<li>Sun UltraSPARC workstations running Solaris 10.</li>
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<li>Alpha-based machines running Debian GNU/Linux.</li>
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<li>Itanium-based (IA64) machines running Linux and HP-UX.</li>
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</ul>
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<p>The core LLVM infrastructure uses GNU autoconf to adapt itself
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to the machine and operating system on which it is built. However, minor
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porting may be required to get LLVM to work on new platforms. We welcome your
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portability patches and reports of successful builds or error messages.</p>
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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 all known problems with the LLVM system, listed by
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component. As new problems are discovered, they will be added to these
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sections. 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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<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
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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 MSIL, IA64, Alpha, SPU, and MIPS backends are experimental.</li>
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<li>The llc "<tt>-filetype=asm</tt>" (the default) is the only supported
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value for this option.</li>
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</ul>
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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="x86-be">Known problems with the X86 back-end</a>
|
|
</div>
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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>The X86 backend generates inefficient floating point code when configured
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to generate code for systems that don't have SSE2.</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 mingw64 runtime
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currently due
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to <a href="http://llvm.org/PR2255">several</a>
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<a href="http://llvm.org/PR2257">bugs</a> due to lack of support for the
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'u' inline assembly constraint and X87 floating point inline assembly.</li>
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<li>The X86-64 backend does not yet support the LLVM IR instruction
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<tt>va_arg</tt>. Currently, the llvm-gcc front-end supports variadic
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argument constructs on X86-64 by lowering them manually.</li>
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</ul>
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</div>
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|
<!-- ======================================================================= -->
|
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<div class="doc_subsection">
|
|
<a name="ppc-be">Known problems with the PowerPC back-end</a>
|
|
</div>
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|
|
|
<div class="doc_text">
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<ul>
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<li>The Linux PPC32/ABI support needs testing for the interpreter and static
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compilation, and lacks support for debug information.</li>
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</ul>
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</div>
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|
|
<!-- ======================================================================= -->
|
|
<div class="doc_subsection">
|
|
<a name="arm-be">Known problems with the ARM back-end</a>
|
|
</div>
|
|
|
|
<div class="doc_text">
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|
|
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<ul>
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<li>Thumb mode works only on ARMv6 or higher processors. On sub-ARMv6
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|
processors, thumb programs can crash or produce wrong
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results (<a href="http://llvm.org/PR1388">PR1388</a>).</li>
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<li>Compilation for ARM Linux OABI (old ABI) is supported, but not fully tested.
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</li>
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<li>There is a bug in QEMU-ARM (<= 0.9.0) which causes it to incorrectly
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execute
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programs compiled with LLVM. Please use more recent versions of QEMU.</li>
|
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</ul>
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|
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</div>
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<!-- ======================================================================= -->
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<div class="doc_subsection">
|
|
<a name="sparc-be">Known problems with the SPARC back-end</a>
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|
</div>
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|
|
<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="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="ia64-be">Known problems with the IA64 back-end</a>
|
|
</div>
|
|
|
|
<div class="doc_text">
|
|
|
|
<ul>
|
|
<li>The Itanium backend is highly experimental, and has a number of known
|
|
issues. We are looking for a maintainer for the Itanium backend. If you
|
|
are interested, please contact the llvmdev mailing list.</li>
|
|
</ul>
|
|
|
|
</div>
|
|
|
|
<!-- ======================================================================= -->
|
|
<div class="doc_subsection">
|
|
<a name="c-be">Known problems with the C back-end</a>
|
|
</div>
|
|
|
|
<div class="doc_text">
|
|
|
|
<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 llc or native compilers.</li>
|
|
<li>The C backend does not support all exception handling constructs.</li>
|
|
</ul>
|
|
|
|
</div>
|
|
|
|
|
|
<!-- ======================================================================= -->
|
|
<div class="doc_subsection">
|
|
<a name="c-fe">Known problems with the llvm-gcc C front-end</a>
|
|
</div>
|
|
|
|
<div class="doc_text">
|
|
|
|
<p>llvm-gcc does not currently support <a href="http://llvm.org/PR869">Link-Time
|
|
Optimization</a> on most platforms "out-of-the-box". Please inquire on the
|
|
llvmdev mailing list if you are interested.</p>
|
|
|
|
<p>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>If you run into GCC extensions which are not supported, please let us know.
|
|
</p>
|
|
|
|
</div>
|
|
|
|
<!-- ======================================================================= -->
|
|
<div class="doc_subsection">
|
|
<a name="c++-fe">Known problems with the llvm-gcc C++ front-end</a>
|
|
</div>
|
|
|
|
<div class="doc_text">
|
|
|
|
<p>The C++ front-end is considered to be fully
|
|
tested and works for a number of non-trivial programs, including LLVM
|
|
itself, Qt, Mozilla, etc.</p>
|
|
|
|
<ul>
|
|
<li>Exception handling works well on the X86 and PowerPC targets. Currently
|
|
only linux and darwin targets are supported (both 32 and 64 bit).</li>
|
|
</ul>
|
|
|
|
</div>
|
|
|
|
|
|
<!-- ======================================================================= -->
|
|
<div class="doc_subsection">
|
|
<a name="ada-fe">Known problems with the llvm-gcc Ada front-end</a>
|
|
</div>
|
|
|
|
<div class="doc_text">
|
|
The llvm-gcc 4.2 Ada compiler works fairly well, however this is not a mature
|
|
technology and problems should be expected.
|
|
<ul>
|
|
<li>The Ada front-end currently only builds on X86-32. This is mainly due
|
|
to lack of trampoline support (pointers to nested functions) on other platforms,
|
|
however it <a href="http://llvm.org/PR2006">also fails to build on X86-64</a>
|
|
which does support trampolines.</li>
|
|
<li>The Ada front-end <a href="http://llvm.org/PR2007">fails to bootstrap</a>.
|
|
Workaround: configure with --disable-bootstrap.</li>
|
|
<li>The c380004, <a href="http://llvm.org/PR2010">c393010</a>
|
|
and <a href="http://llvm.org/PR2421">cxg2021</a> ACATS tests fail
|
|
(c380004 also fails with gcc-4.2 mainline).</li>
|
|
<li>Some gcc specific Ada tests continue to crash the compiler.</li>
|
|
<li>The -E binder option (exception backtraces)
|
|
<a href="http://llvm.org/PR1982">does not work</a> and will result in programs
|
|
crashing if an exception is raised. Workaround: do not use -E.</li>
|
|
<li>Only discrete types <a href="http://llvm.org/PR1981">are allowed to start
|
|
or finish at a non-byte offset</a> in a record. Workaround: do not pack records
|
|
or use representation clauses that result in a field of a non-discrete type
|
|
starting or finishing in the middle of a byte.</li>
|
|
<li>The <tt>lli</tt> interpreter <a href="http://llvm.org/PR2009">considers
|
|
'main' as generated by the Ada binder to be invalid</a>.
|
|
Workaround: hand edit the file to use pointers for <tt>argv</tt> and
|
|
<tt>envp</tt> rather than integers.</li>
|
|
<li>The <tt>-fstack-check</tt> option <a href="http://llvm.org/PR2008">is
|
|
ignored</a>.</li>
|
|
</ul>
|
|
</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>
|
|
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<a href="http://llvm.org/">LLVM Compiler Infrastructure</a><br>
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