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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 2.3 Release Notes</title>
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</head>
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<body>
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2008-02-12 06:29:45 +00:00
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<div class="doc_title">LLVM 2.3 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="#whatsnew">What's New?</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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2004-05-23 21:07:27 +00:00
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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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2008-06-05 08:02:49 +00:00
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<!-- Done through Week-of-Mon-20080324.txt -->
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2003-10-02 04:57:28 +00:00
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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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2003-10-02 04:57:28 +00:00
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<!-- *********************************************************************** -->
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2003-11-22 00:38:41 +00:00
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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 2.3. Here we describe the status of LLVM, including
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major improvements from the previous release and any known problems. All LLVM
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releases may be downloaded from the <a href="http://llvm.org/releases/">LLVM
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releases web site</a>.</p>
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2003-10-02 16:38:05 +00:00
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2004-12-07 08:04:13 +00:00
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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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2007-07-09 08:04:31 +00:00
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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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<!-- *********************************************************************** -->
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<div class="doc_section">
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<a name="whatsnew">What's New?</a>
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</div>
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<!-- *********************************************************************** -->
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<div class="doc_text">
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2008-02-12 06:29:45 +00:00
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<p>This is the fourteenth public release of the LLVM Compiler Infrastructure.
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It includes a large number of features and refinements from LLVM 2.2.</p>
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2003-12-06 20:22:41 +00:00
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2004-05-24 04:50:25 +00:00
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</div>
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2008-02-12 06:29:45 +00:00
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<!-- Unfinished features in 2.3:
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Machine LICM
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Machine Sinking
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LegalizeDAGTypes
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-->
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2008-02-10 07:04:35 +00:00
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<!--=========================================================================-->
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<div class="doc_subsection">
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<a name="changes">Major Changes in LLVM 2.3</a>
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</div>
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<div class="doc_text">
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2008-02-12 06:29:45 +00:00
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<p>LLVM 2.2 was the last LLVM release to support llvm-gcc 4.0 and llvm-upgrade.
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llvm-gcc 4.0 has been replaced with llvm-gcc 4.2. llvm-upgrade was useful for
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upgrading LLVM 1.9 files to LLVM 2.x syntax, but you can always use a previous
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LLVM release to do this. One nice impact of this is that the LLVM regression
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test suite no longer depends on llvm-upgrade, which makes it run faster.</p>
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2008-02-10 07:04:35 +00:00
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2008-06-08 02:45:07 +00:00
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<p>LLVM API Changes:</p>
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2008-06-08 02:45:07 +00:00
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<ul>
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<li>Several core LLVM IR classes have migrated to use 'FOOCLASS::Create(...)'
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instead of 'new FOOCLASS(...)' (e.g. where FOOCLASS=BasicBlock). We hope to
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standardize on FOOCLASS::Create for all IR classes in the future, but not
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all of them have been moved over yet.</li>
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<li>LLVM 2.3 renames the LLVMBuilder and LLVMFoldingBuilder classes to
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IRBuilder.</li>
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<li>MRegisterInfo was renamed to TargetRegisterInfo.</li>
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<li>The MappedFile class is gone, please use MemoryBuffer instead.</li>
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2008-06-08 20:18:35 +00:00
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<li>The '-enable-eh' flag to llc has been removed. Now code should encode
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2008-06-08 02:45:07 +00:00
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whether it is safe to not generate unwind information for a function by
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tagging the Function object with the 'nounwind' attribute.</li>
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</ul>
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2008-02-10 07:04:35 +00:00
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</div>
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2003-12-06 20:22:41 +00:00
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<!--=========================================================================-->
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2005-05-15 05:44:51 +00:00
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<div class="doc_subsection">
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<a name="majorfeatures">Major New Features</a>
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2006-04-18 06:18:36 +00:00
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</div>
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2007-05-14 06:56:09 +00:00
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<div class="doc_text">
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2008-06-05 06:25:56 +00:00
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<p>LLVM 2.3 includes several major new capabilities:</p>
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2008-06-05 06:25:56 +00:00
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<ul>
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<li>Multiple Return Value Support.</li>
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2008-06-05 06:57:39 +00:00
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<li><p>LLVM 2.3 includes a complete reimplementation of the "llvmc" tool. It is
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designed to overcome several problems with the original llvmc and to provide a
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superset of the features of the 'gcc' driver.</p>
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<p>The main features of llvmc2 is:</p>
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<ul>
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<li>Extended handling of command line options and smart rules for
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dispatching them to different tools.</li>
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<li>Flexible (and extensible) rules for defining different tools.</li>
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<li>The different intermediate steps performed by tools are represented
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as edges in the abstract graph.</li>
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<li>The 'language' for driver behavior definition is tablegen and thus
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it's relatively easy to add new features.</li>
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<li>The definition of driver is transformed into set of C++ classes, thus
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no runtime interpretation is needed.</li>
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</ul>
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</li>
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2008-06-05 18:39:01 +00:00
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2008-06-05 08:02:49 +00:00
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<li>Reimplemented <a href="LinkTimeOptimization.html">LTO interface</a> in
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C.</li>
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2008-06-05 06:57:39 +00:00
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2008-06-08 20:18:35 +00:00
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<li>Kaleidoscope tutorial in Ocaml.</li>
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2008-06-05 06:25:56 +00:00
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</ul>
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2008-02-06 18:00:06 +00:00
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</div>
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2008-06-05 06:25:56 +00:00
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2008-02-06 18:00:06 +00:00
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<!--=========================================================================-->
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<div class="doc_subsection">
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2008-06-05 06:25:56 +00:00
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<a name="frontends">llvm-gcc 4.2 Improvements and Clang</a>
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2008-02-06 18:00:06 +00:00
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</div>
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<div class="doc_text">
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2008-06-08 20:18:35 +00:00
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<p>LLVM 2.3 fully supports the llvm-gcc 4.2 front-end.</p>
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2008-02-06 18:00:06 +00:00
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2008-06-05 06:25:56 +00:00
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<p>llvm-gcc 4.2 includes numerous fixes to better support the Objective-C
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front-end. Objective-C now works very well on Mac OS/X.</p>
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<p>llvm-gcc 4.2 includes many other fixes which improve conformance with the
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relevant parts of the GCC testsuite.</p>
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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. Currently, its C and Objective-C support is maturing
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nicely, and it has advanced source-to-source analysis and transformation
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capabilities. If you are interested in building source-level tools for C and
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Objective-C (and eventually C++), you should take a look. However, note that
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clang is not an official part of the LLVM 2.3 release. If you are interested in
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this project, please see its <a href="http://clang.llvm.org/">web site</a>.</p>
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2008-02-10 08:18:42 +00:00
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2007-05-14 06:56:09 +00:00
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</div>
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2008-06-05 06:25:56 +00:00
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2008-02-10 08:17:19 +00:00
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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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2008-06-05 06:25:56 +00:00
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Common linkage?
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2008-06-08 02:45:07 +00:00
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Atomic operation support, Alpha, X86, X86-64, PowerPC. "__sync_synchronize",
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2008-06-08 10:23:46 +00:00
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"__sync_val_compare_and_swap", etc
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2008-06-05 06:25:56 +00:00
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<ul>
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2008-06-05 12:51:50 +00:00
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<li>The C and Ocaml bindings have received additional improvements. The
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bindings now cover pass managers, several transformation passes, iteration
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over the LLVM IR, target data, and parameter attribute lists.</li>
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2008-02-10 08:17:19 +00:00
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</ul>
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</div>
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2007-09-21 03:54:09 +00:00
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<!--=========================================================================-->
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<div class="doc_subsection">
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2008-02-10 07:46:44 +00:00
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<a name="optimizer">Optimizer Improvements</a>
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2007-09-21 03:54:09 +00:00
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</div>
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2007-05-18 06:33:02 +00:00
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2006-04-18 06:18:36 +00:00
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<div class="doc_text">
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2007-09-21 03:54:09 +00:00
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2008-02-10 08:17:19 +00:00
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<p>In addition to a huge array of bug fixes and minor performance tweaks, the
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2008-02-12 06:29:45 +00:00
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LLVM 2.3 optimizers support a few major enhancements:</p>
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2007-09-26 05:44:21 +00:00
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2006-11-18 07:51:14 +00:00
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<ul>
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2007-05-16 23:25:46 +00:00
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2008-06-05 21:44:00 +00:00
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<li>Loop index set splitting on by default.<p>
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This transformation hoists conditions from loop bodies and reduces loop's
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iteration space to improve performance. For example, <p>
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<pre>
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2008-06-08 20:25:30 +00:00
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for (i = LB; i < UB; ++i)
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if (i <= NV)
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LOOP_BODY
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</pre>
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is transformed into
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<pre>
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NUB = min(NV+1, UB)
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for (i = LB; i < NUB; ++i)
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LOOP_BODY
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</pre>
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</li>
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2008-06-08 02:45:07 +00:00
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2008-06-08 20:18:35 +00:00
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<li>LLVM includes a new <tt>memcpy</tt> optimization pass removes
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dead <tt>memcpy</tt> calls, unneeded copies of aggregates, and performs
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2008-06-08 02:45:07 +00:00
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return slot optimization. The LLVM optimizer now notices long sequences of
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2008-06-08 20:18:35 +00:00
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consecutive stores and merges them into <tt>memcpy</tt>'s where profitable.</li>
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2008-06-08 02:45:07 +00:00
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2008-06-05 18:39:01 +00:00
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<li>Alignment detection for vector memory references and for <tt>memcpy</tt> and
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<tt>memset</tt> is now more aggressive.</li>
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2008-06-06 16:23:15 +00:00
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2008-06-08 02:45:07 +00:00
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<li>The aggressive dead code elimination (ADCE) optimization has been rewritten
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to make it both faster and safer in the presence of code containing infinite
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loops. Some of its prior functionality has been factored out into the loop
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deletion pass, which <em>is</em> safe for infinite loops.</li>
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<li>Several optimizations have been sped up, leading to faster code generation
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with the same code quality.</li>
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<li>The 'SimplifyLibCalls' pass, which optimizes calls to libc and libm
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functions for C-based languages, has been rewritten to be a FunctionPass
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instead a ModulePass. This allows it to be run more often and to be
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included at -O1 in llvm-gcc. It was also extended to include more
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2008-06-08 20:18:35 +00:00
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optimizations and several corner case bugs were fixed.</li>
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2008-06-08 02:45:07 +00:00
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2008-06-08 19:38:43 +00:00
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<li>LLVM now includes a simple 'Jump Threading' pass, which attempts to simplify
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2008-06-08 20:18:35 +00:00
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conditional branches using information about predecessor blocks, simplifying
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the control flow graph. This pass is pretty basic at this point, but catches
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some important cases and provides a foundation to build on.</li>
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2008-06-08 02:45:07 +00:00
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</ul>
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|
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
<!--=========================================================================-->
|
|
|
|
|
<div class="doc_subsection">
|
|
|
|
|
<a name="codegen">Code Generator Improvements</a>
|
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
<div class="doc_text">
|
|
|
|
|
|
|
|
|
|
<p>We put a significant amount of work into the code generator infrastructure,
|
|
|
|
|
which allows us to implement more aggressive algorithms and make it run
|
|
|
|
|
faster:</p>
|
|
|
|
|
|
|
|
|
|
<ul>
|
|
|
|
|
<li>MemOperand in the code generator: describe me!.</li>
|
|
|
|
|
|
|
|
|
|
<li>The target-independent code generator infrastructure now uses LLVM's APInt
|
|
|
|
|
class to handle integer values, which allows it to support integer types
|
|
|
|
|
larger than 64 bits. Note that support for such types is also dependent on
|
|
|
|
|
target-specific support. Use of APInt is also a step toward support for
|
|
|
|
|
non-power-of-2 integer sizes.</li>
|
|
|
|
|
|
|
|
|
|
<li>Several compile time speedups for code with large basic blocks.</li>
|
|
|
|
|
|
|
|
|
|
<li>Several improvements which make llc's <tt>--view-sunit-dags</tt>
|
|
|
|
|
visualization of scheduling dependency graphs easier to understand.</li>
|
|
|
|
|
|
|
|
|
|
<li>The code generator allows targets to write patterns that generate subreg
|
|
|
|
|
references directly in .td files now.</li>
|
|
|
|
|
|
|
|
|
|
<li><tt>memcpy</tt> lowering in the backend is more aggressive, particularly for
|
|
|
|
|
<tt>memcpy</tt> calls introduced by the code generator when handling
|
|
|
|
|
pass-by-value structure argument copies.</li>
|
2006-11-18 07:51:14 +00:00
|
|
|
</ul>
|
2007-09-21 03:54:09 +00:00
|
|
|
|
2006-04-18 06:18:36 +00:00
|
|
|
</div>
|
|
|
|
|
|
2007-09-21 03:54:09 +00:00
|
|
|
|
|
|
|
|
<!--=========================================================================-->
|
|
|
|
|
<div class="doc_subsection">
|
2008-06-05 08:02:49 +00:00
|
|
|
<a name="x86specific">X86/X86-64 Specific Improvements</a>
|
2007-09-21 03:54:09 +00:00
|
|
|
</div>
|
2006-11-18 07:51:14 +00:00
|
|
|
|
2006-04-18 06:18:36 +00:00
|
|
|
<div class="doc_text">
|
2008-02-10 08:17:19 +00:00
|
|
|
<p>New target-specific features include:
|
2007-05-14 06:56:09 +00:00
|
|
|
</p>
|
|
|
|
|
|
|
|
|
|
<ul>
|
2008-06-05 06:25:56 +00:00
|
|
|
<li>llvm-gcc's X86-64 ABI conformance is far improved, particularly in the
|
2008-06-05 18:39:01 +00:00
|
|
|
area of passing and returning structures by value. llvm-gcc compiled code
|
2008-06-05 06:25:56 +00:00
|
|
|
now interoperates very well on X86-64 systems with other compilers.</li>
|
|
|
|
|
|
2008-06-08 19:38:43 +00:00
|
|
|
<li>Support for Win64 was added. This includes code generation itself, JIT
|
2008-06-08 10:24:13 +00:00
|
|
|
support and necessary changes to llvm-gcc.</li>
|
|
|
|
|
|
2008-06-05 06:25:56 +00:00
|
|
|
<li>The LLVM X86 backend now supports the support SSE 4.1 instruction set, and
|
2008-06-08 02:45:07 +00:00
|
|
|
the llvm-gcc 4.2 front-end supports the SSE 4.1 compiler builtins. Various
|
|
|
|
|
generic vector operations (insert/extract/shuffle) are much more efficient
|
|
|
|
|
when SSE 4.1 is enabled. The JIT automatically takes advantage of these
|
|
|
|
|
instructions, but llvm-gcc must be explicitly told to use them, e.g. with
|
|
|
|
|
<tt>-march=penryn</tt>.</li>
|
2008-06-08 10:24:13 +00:00
|
|
|
|
2008-06-05 06:25:56 +00:00
|
|
|
<li>The X86 backend now does a number of optimizations that aim to avoid
|
|
|
|
|
converting numbers back and forth from SSE registers to the X87 floating
|
|
|
|
|
point stack.</li>
|
2008-06-08 10:24:13 +00:00
|
|
|
|
2008-06-05 06:57:39 +00:00
|
|
|
<li>The X86 backend supports stack realignment, which is particularly useful for
|
|
|
|
|
vector code on OS's without 16-byte aligned stacks.</li>
|
2008-06-05 06:25:56 +00:00
|
|
|
|
|
|
|
|
<li>The X86 backend now supports the "sseregparm" options in GCC, which allow
|
|
|
|
|
functions to be tagged as passing floating point values in SSE
|
|
|
|
|
registers.</li>
|
|
|
|
|
|
|
|
|
|
<li>Trampolines (taking the address of a nested function) now work on
|
2008-06-08 20:18:35 +00:00
|
|
|
Linux/X86-64.</li>
|
2008-06-08 10:24:13 +00:00
|
|
|
|
2008-06-05 08:02:49 +00:00
|
|
|
<li><tt>__builtin_prefetch</tt> is now compiled into the appropriate prefetch
|
|
|
|
|
instructions instead of being ignored.</li>
|
2008-06-05 06:25:56 +00:00
|
|
|
|
2008-06-08 20:18:35 +00:00
|
|
|
<li>128-bit integers are now supported on X86-64 targets.</li>
|
2008-06-05 16:15:39 +00:00
|
|
|
|
2008-06-08 02:45:07 +00:00
|
|
|
<li>The register allocator can now rematerialize PIC-base computations.</li>
|
|
|
|
|
|
2007-05-16 23:25:46 +00:00
|
|
|
</ul>
|
2007-09-21 03:54:09 +00:00
|
|
|
|
2007-05-14 06:56:09 +00:00
|
|
|
</div>
|
|
|
|
|
|
2008-06-05 08:02:49 +00:00
|
|
|
<!--=========================================================================-->
|
|
|
|
|
<div class="doc_subsection">
|
|
|
|
|
<a name="targetspecific">Other Target Specific Improvements</a>
|
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
<div class="doc_text">
|
|
|
|
|
<p>New target-specific features include:
|
|
|
|
|
</p>
|
|
|
|
|
|
|
|
|
|
<ul>
|
2008-06-05 18:39:01 +00:00
|
|
|
<li>The LLVM C backend now supports vector code.</li>
|
2008-06-05 08:02:49 +00:00
|
|
|
|
|
|
|
|
|
|
|
|
|
</ul>
|
|
|
|
|
|
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
2007-09-21 03:54:09 +00:00
|
|
|
<!--=========================================================================-->
|
|
|
|
|
<div class="doc_subsection">
|
|
|
|
|
<a name="otherimprovements">Other Improvements</a>
|
|
|
|
|
</div>
|
2007-05-14 06:56:09 +00:00
|
|
|
|
2006-04-18 06:32:08 +00:00
|
|
|
<div class="doc_text">
|
2007-09-21 03:54:09 +00:00
|
|
|
<p>New features include:
|
|
|
|
|
</p>
|
2006-04-18 06:18:36 +00:00
|
|
|
|
2006-02-05 06:39:36 +00:00
|
|
|
<ul>
|
2008-06-05 06:57:39 +00:00
|
|
|
<li>LLVM now builds with GCC 4.3.</li>
|
2008-06-08 02:45:07 +00:00
|
|
|
<li><tt>llvm2cpp</tt> tool has been folded into llc, use
|
|
|
|
|
<tt>llc -march=cpp</tt></li>
|
2007-05-17 21:41:31 +00:00
|
|
|
</ul>
|
2007-09-21 03:54:09 +00:00
|
|
|
|
2007-05-17 21:41:31 +00:00
|
|
|
</div>
|
2006-03-03 00:34:26 +00:00
|
|
|
|
2003-10-02 16:38:05 +00:00
|
|
|
<!-- *********************************************************************** -->
|
2003-11-22 00:38:41 +00:00
|
|
|
<div class="doc_section">
|
|
|
|
|
<a name="portability">Portability and Supported Platforms</a>
|
|
|
|
|
</div>
|
2003-10-02 16:38:05 +00:00
|
|
|
<!-- *********************************************************************** -->
|
|
|
|
|
|
2003-11-22 00:38:41 +00:00
|
|
|
<div class="doc_text">
|
|
|
|
|
|
2004-12-08 20:35:47 +00:00
|
|
|
<p>LLVM is known to work on the following platforms:</p>
|
2004-06-01 18:22:41 +00:00
|
|
|
|
|
|
|
|
<ul>
|
2008-06-05 18:39:01 +00:00
|
|
|
<li>Intel and AMD machines (IA32) running Red Hat Linux, Fedora Core and FreeBSD
|
2005-05-17 02:47:27 +00:00
|
|
|
(and probably other unix-like systems).</li>
|
2008-02-06 06:30:34 +00:00
|
|
|
<li>PowerPC and X86-based Mac OS X systems, running 10.3 and above in 32-bit and
|
2007-05-23 04:39:32 +00:00
|
|
|
64-bit modes.</li>
|
2008-02-06 18:00:06 +00:00
|
|
|
<li>Intel and AMD machines running on Win32 using MinGW libraries (native).</li>
|
2004-12-07 08:04:13 +00:00
|
|
|
<li>Intel and AMD machines running on Win32 with the Cygwin libraries (limited
|
|
|
|
|
support is available for native builds with Visual C++).</li>
|
2008-06-05 18:39:01 +00:00
|
|
|
<li>Sun UltraSPARC workstations running Solaris 10.</li>
|
2005-05-13 20:28:15 +00:00
|
|
|
<li>Alpha-based machines running Debian GNU/Linux.</li>
|
2008-06-05 18:39:01 +00:00
|
|
|
<li>Itanium-based (IA64) machines running Linux and HP-UX.</li>
|
2004-06-01 18:22:41 +00:00
|
|
|
</ul>
|
|
|
|
|
|
2008-06-05 06:57:39 +00:00
|
|
|
<p>The core LLVM infrastructure uses GNU autoconf to adapt itself
|
2004-05-09 05:28:35 +00:00
|
|
|
to the machine and operating system on which it is built. However, minor
|
|
|
|
|
porting may be required to get LLVM to work on new platforms. We welcome your
|
|
|
|
|
portability patches and reports of successful builds or error messages.</p>
|
2003-10-02 04:57:28 +00:00
|
|
|
|
2003-11-22 00:38:41 +00:00
|
|
|
</div>
|
2003-10-02 04:57:28 +00:00
|
|
|
|
|
|
|
|
<!-- *********************************************************************** -->
|
2003-11-22 00:38:41 +00:00
|
|
|
<div class="doc_section">
|
|
|
|
|
<a name="knownproblems">Known Problems</a>
|
|
|
|
|
</div>
|
2003-10-02 04:57:28 +00:00
|
|
|
<!-- *********************************************************************** -->
|
|
|
|
|
|
2003-11-22 00:38:41 +00:00
|
|
|
<div class="doc_text">
|
|
|
|
|
|
|
|
|
|
<p>This section contains all known problems with the LLVM system, listed by
|
2003-10-02 04:57:28 +00:00
|
|
|
component. As new problems are discovered, they will be added to these
|
2003-12-12 21:22:16 +00:00
|
|
|
sections. If you run into a problem, please check the <a
|
2005-10-29 07:07:09 +00:00
|
|
|
href="http://llvm.org/bugs/">LLVM bug database</a> and submit a bug if
|
2003-12-12 21:22:16 +00:00
|
|
|
there isn't already one.</p>
|
2003-10-02 04:57:28 +00:00
|
|
|
|
2003-11-22 00:38:41 +00:00
|
|
|
</div>
|
2003-10-02 04:57:28 +00:00
|
|
|
|
2004-03-14 02:03:02 +00:00
|
|
|
<!-- ======================================================================= -->
|
|
|
|
|
<div class="doc_subsection">
|
|
|
|
|
<a name="experimental">Experimental features included with this release</a>
|
|
|
|
|
</div>
|
2003-10-02 04:57:28 +00:00
|
|
|
|
2004-03-14 02:03:02 +00:00
|
|
|
<div class="doc_text">
|
|
|
|
|
|
2004-05-12 21:46:05 +00:00
|
|
|
<p>The following components of this LLVM release are either untested, known to
|
|
|
|
|
be broken or unreliable, or are in early development. These components should
|
|
|
|
|
not be relied on, and bugs should not be filed against them, but they may be
|
|
|
|
|
useful to some people. In particular, if you would like to work on one of these
|
2008-02-12 06:29:45 +00:00
|
|
|
components, please contact us on the <a
|
|
|
|
|
href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVMdev list</a>.</p>
|
2004-03-14 02:03:02 +00:00
|
|
|
|
|
|
|
|
<ul>
|
2008-02-12 06:29:45 +00:00
|
|
|
<li>The MSIL, IA64, Alpha, SPU, and MIPS backends are experimental.</li>
|
2008-06-08 20:18:35 +00:00
|
|
|
<li>The llc "<tt>-filetype=asm</tt>" (the default) is the only supported
|
2008-02-06 06:30:34 +00:00
|
|
|
value for this option.</li>
|
2004-03-14 02:03:02 +00:00
|
|
|
</ul>
|
|
|
|
|
|
|
|
|
|
</div>
|
2003-10-02 04:57:28 +00:00
|
|
|
|
2005-11-08 21:11:33 +00:00
|
|
|
<!-- ======================================================================= -->
|
|
|
|
|
<div class="doc_subsection">
|
2006-11-18 07:51:14 +00:00
|
|
|
<a name="x86-be">Known problems with the X86 back-end</a>
|
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
<div class="doc_text">
|
|
|
|
|
|
|
|
|
|
<ul>
|
2008-06-08 10:24:13 +00:00
|
|
|
<li>The X86 backend does not yet support
|
|
|
|
|
all <a href="http://llvm.org/PR879">inline assembly that uses the X86
|
|
|
|
|
floating point stack</a>. It supports the 'f' and 't' constraints, but not
|
|
|
|
|
'u'.</li>
|
|
|
|
|
<li>The X86 backend generates inefficient floating point code when configured to
|
2008-02-10 08:17:19 +00:00
|
|
|
generate code for systems that don't have SSE2.</li>
|
2008-06-08 19:38:43 +00:00
|
|
|
<li>Win64 code generation wasn't widely tested. Everything should work, but we
|
2008-06-08 10:24:13 +00:00
|
|
|
expect small issues to happen. Also, llvm-gcc cannot build mingw64 runtime
|
|
|
|
|
currently due
|
|
|
|
|
to <a href="http://llvm.org/PR2255">several</a>
|
|
|
|
|
<a href="http://llvm.org/PR2257">bugs</a> in FP stackifier
|
2006-11-18 07:51:14 +00:00
|
|
|
</ul>
|
|
|
|
|
|
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
<!-- ======================================================================= -->
|
|
|
|
|
<div class="doc_subsection">
|
|
|
|
|
<a name="ppc-be">Known problems with the PowerPC back-end</a>
|
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
<div class="doc_text">
|
|
|
|
|
|
|
|
|
|
<ul>
|
2007-05-15 09:21:28 +00:00
|
|
|
<li>The Linux PPC32/ABI support needs testing for the interpreter and static
|
2007-05-23 04:39:32 +00:00
|
|
|
compilation, and lacks support for debug information.</li>
|
2006-11-18 07:51:14 +00:00
|
|
|
</ul>
|
|
|
|
|
|
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
<!-- ======================================================================= -->
|
|
|
|
|
<div class="doc_subsection">
|
2007-05-14 06:56:09 +00:00
|
|
|
<a name="arm-be">Known problems with the ARM back-end</a>
|
2006-11-18 07:51:14 +00:00
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
<div class="doc_text">
|
|
|
|
|
|
|
|
|
|
<ul>
|
2007-05-23 04:39:32 +00:00
|
|
|
<li>Thumb mode works only on ARMv6 or higher processors. On sub-ARMv6
|
2007-09-26 15:59:54 +00:00
|
|
|
processors, thumb programs can crash or produce wrong
|
2007-05-23 04:39:32 +00:00
|
|
|
results (<a href="http://llvm.org/PR1388">PR1388</a>).</li>
|
2007-05-14 06:56:09 +00:00
|
|
|
<li>Compilation for ARM Linux OABI (old ABI) is supported, but not fully tested.
|
|
|
|
|
</li>
|
2008-02-10 08:17:19 +00:00
|
|
|
<li>There is a bug in QEMU-ARM (<= 0.9.0) which causes it to incorrectly execute
|
2007-05-23 04:39:32 +00:00
|
|
|
programs compiled with LLVM. Please use more recent versions of QEMU.</li>
|
2006-11-18 07:51:14 +00:00
|
|
|
</ul>
|
|
|
|
|
|
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
<!-- ======================================================================= -->
|
|
|
|
|
<div class="doc_subsection">
|
2007-05-14 06:56:09 +00:00
|
|
|
<a name="sparc-be">Known problems with the SPARC back-end</a>
|
2006-11-18 07:51:14 +00:00
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
<div class="doc_text">
|
|
|
|
|
|
|
|
|
|
<ul>
|
2007-05-14 06:56:09 +00:00
|
|
|
<li>The SPARC backend only supports the 32-bit SPARC ABI (-m32), it does not
|
|
|
|
|
support the 64-bit SPARC ABI (-m64).</li>
|
2006-11-18 07:51:14 +00:00
|
|
|
</ul>
|
|
|
|
|
|
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
<!-- ======================================================================= -->
|
|
|
|
|
<div class="doc_subsection">
|
|
|
|
|
<a name="alpha-be">Known problems with the Alpha back-end</a>
|
2005-11-08 21:11:33 +00:00
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
<div class="doc_text">
|
|
|
|
|
|
|
|
|
|
<ul>
|
2006-11-18 07:51:14 +00:00
|
|
|
|
|
|
|
|
<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>C++ programs are likely to fail on IA64, as calls to <tt>setjmp</tt> are
|
|
|
|
|
made where the argument is not 16-byte aligned, as required on IA64. (Strictly
|
|
|
|
|
speaking this is not a bug in the IA64 back-end; it will also be encountered
|
|
|
|
|
when building C++ programs using the C back-end.)</li>
|
|
|
|
|
|
|
|
|
|
<li>The C++ front-end does not use <a href="http://llvm.org/PR406">IA64
|
|
|
|
|
ABI compliant layout of v-tables</a>. In particular, it just stores function
|
|
|
|
|
pointers instead of function descriptors in the vtable. This bug prevents
|
|
|
|
|
mixing C++ code compiled with LLVM with C++ objects compiled by other C++
|
|
|
|
|
compilers.</li>
|
|
|
|
|
|
|
|
|
|
<li>There are a few ABI violations which will lead to problems when mixing LLVM
|
|
|
|
|
output with code built with other compilers, particularly for floating-point
|
|
|
|
|
programs.</li>
|
|
|
|
|
|
2008-06-08 19:38:43 +00:00
|
|
|
<li>Defining vararg functions is not supported (but calling them is OK).</li>
|
2006-11-18 07:51:14 +00:00
|
|
|
|
2007-05-09 04:58:11 +00:00
|
|
|
<li>The Itanium backend has bitrotted somewhat.</li>
|
2005-11-08 21:11:33 +00:00
|
|
|
</ul>
|
2006-11-18 07:51:14 +00:00
|
|
|
|
2005-11-08 21:11:33 +00:00
|
|
|
</div>
|
|
|
|
|
|
2006-11-18 07:51:14 +00:00
|
|
|
<!-- ======================================================================= -->
|
|
|
|
|
<div class="doc_subsection">
|
2007-05-14 06:56:09 +00:00
|
|
|
<a name="c-be">Known problems with the C back-end</a>
|
2006-11-18 07:51:14 +00:00
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
<div class="doc_text">
|
|
|
|
|
|
|
|
|
|
<ul>
|
2008-06-05 06:35:40 +00:00
|
|
|
<li><a href="http://llvm.org/PR802">The C backend has only basic support for
|
|
|
|
|
inline assembly code</a>.</li>
|
2007-09-26 06:01:35 +00:00
|
|
|
<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
|
2008-06-08 20:18:35 +00:00
|
|
|
C++ code compiled with llc or native compilers.</li>
|
2008-02-10 13:40:55 +00:00
|
|
|
<li>The C backend does not support all exception handling constructs.</li>
|
2006-11-18 07:51:14 +00:00
|
|
|
</ul>
|
|
|
|
|
|
|
|
|
|
</div>
|
2005-11-08 21:11:33 +00:00
|
|
|
|
2003-11-22 00:38:41 +00:00
|
|
|
|
|
|
|
|
<!-- ======================================================================= -->
|
|
|
|
|
<div class="doc_subsection">
|
2008-06-05 06:35:40 +00:00
|
|
|
<a name="c-fe">Known problems with the llvm-gcc C front-end</a>
|
2003-11-22 00:38:41 +00:00
|
|
|
</div>
|
2003-10-02 05:07:23 +00:00
|
|
|
|
2003-10-02 04:57:28 +00:00
|
|
|
<!-- _______________________________________________________________________ -->
|
2003-12-14 05:03:43 +00:00
|
|
|
<div class="doc_subsubsection">Bugs</div>
|
2003-11-22 00:38:41 +00:00
|
|
|
|
|
|
|
|
<div class="doc_text">
|
2006-03-03 00:34:26 +00:00
|
|
|
|
2008-02-06 18:00:06 +00:00
|
|
|
<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
|
2007-05-14 06:56:09 +00:00
|
|
|
llvmdev mailing list if you are interested.</p>
|
2006-11-18 07:51:14 +00:00
|
|
|
|
2008-06-05 06:35:40 +00:00
|
|
|
<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
|
2008-06-08 20:18:35 +00:00
|
|
|
supported on some targets (these are used when you take the address of a
|
|
|
|
|
nested function).</p>
|
2007-09-26 15:59:54 +00:00
|
|
|
|
2008-06-05 06:35:40 +00:00
|
|
|
<p>If you run into GCC extensions which are not supported, please let us know.
|
|
|
|
|
</p>
|
2003-11-22 00:38:41 +00:00
|
|
|
|
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
<!-- ======================================================================= -->
|
|
|
|
|
<div class="doc_subsection">
|
2008-06-05 06:35:40 +00:00
|
|
|
<a name="c++-fe">Known problems with the llvm-gcc C++ front-end</a>
|
2003-11-22 00:38:41 +00:00
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
<div class="doc_text">
|
|
|
|
|
|
2007-05-14 06:56:09 +00:00
|
|
|
<p>The C++ front-end is considered to be fully
|
2004-12-07 08:04:13 +00:00
|
|
|
tested and works for a number of non-trivial programs, including LLVM
|
2007-05-14 06:56:09 +00:00
|
|
|
itself, Qt, Mozilla, etc.</p>
|
2003-10-02 04:57:28 +00:00
|
|
|
|
2003-11-22 00:38:41 +00:00
|
|
|
<ul>
|
2008-06-05 06:35:40 +00:00
|
|
|
<li>Exception handling works well on the X86 and PowerPC targets, including
|
2008-06-08 20:18:35 +00:00
|
|
|
X86-64 darwin. This works when linking to a libstdc++ compiled by GCC. It is
|
|
|
|
|
supported on X86-64 linux, but that is disabled by default in this release.</li>
|
2003-11-22 00:38:41 +00:00
|
|
|
</ul>
|
2003-10-07 22:14:37 +00:00
|
|
|
|
2003-11-22 00:38:41 +00:00
|
|
|
</div>
|
2003-10-07 22:14:37 +00:00
|
|
|
|
2006-04-18 06:18:36 +00:00
|
|
|
|
2008-02-12 06:29:45 +00:00
|
|
|
<!-- ======================================================================= -->
|
|
|
|
|
<div class="doc_subsection">
|
2008-06-05 06:35:40 +00:00
|
|
|
<a name="ada-fe">Known problems with the llvm-gcc Ada front-end</a>
|
2008-02-12 06:29:45 +00:00
|
|
|
</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>
|
2008-06-08 20:18:35 +00:00
|
|
|
<li>The Ada front-end currently only builds on X86-32. This is mainly due
|
2008-02-12 06:29:45 +00:00
|
|
|
to lack of trampoline support (pointers to nested functions) on other platforms,
|
2008-06-08 20:18:35 +00:00
|
|
|
however it <a href="http://llvm.org/PR2006">also fails to build on X86-64</a>
|
2008-02-12 06:29:45 +00:00
|
|
|
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 and <a href="http://llvm.org/PR2010">c393010</a> ACATS tests
|
2008-06-08 20:18:35 +00:00
|
|
|
fail (c380004 also fails with gcc-4.2 mainline). When built at -O3, the
|
|
|
|
|
<a href="http://llvm.org/PR2421">cxg2021</a> ACATS test also fails.</li>
|
|
|
|
|
<li>Some gcc specific Ada tests continue to crash the compiler. The testsuite
|
|
|
|
|
reports most tests as having failed even though they pass.</li>
|
2008-02-12 06:29:45 +00:00
|
|
|
<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>
|
2008-06-05 18:39:01 +00:00
|
|
|
<li>The <tt>lli</tt> interpreter <a href="http://llvm.org/PR2009">considers 'main'
|
2008-02-12 06:29:45 +00:00
|
|
|
as generated by the Ada binder to be invalid</a>.
|
2008-06-05 18:39:01 +00:00
|
|
|
Workaround: hand edit the file to use pointers for <tt>argv</tt> and <tt>envp</tt> rather than
|
2008-02-12 06:29:45 +00:00
|
|
|
integers.</li>
|
2008-06-05 18:39:01 +00:00
|
|
|
<li>The <tt>-fstack-check</tt> option <a href="http://llvm.org/PR2008">is ignored</a>.</li>
|
2008-02-12 06:29:45 +00:00
|
|
|
</ul>
|
|
|
|
|
</div>
|
|
|
|
|
|
2003-10-02 04:57:28 +00:00
|
|
|
<!-- *********************************************************************** -->
|
2003-11-22 00:38:41 +00:00
|
|
|
<div class="doc_section">
|
|
|
|
|
<a name="additionalinfo">Additional Information</a>
|
|
|
|
|
</div>
|
2003-10-02 04:57:28 +00:00
|
|
|
<!-- *********************************************************************** -->
|
|
|
|
|
|
2003-11-22 00:38:41 +00:00
|
|
|
<div class="doc_text">
|
|
|
|
|
|
2005-05-16 17:13:10 +00:00
|
|
|
<p>A wide variety of additional information is available on the <a
|
2007-05-18 00:44:29 +00:00
|
|
|
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
|
2007-07-09 08:04:31 +00:00
|
|
|
contains versions of the API documentation which is up-to-date with the
|
|
|
|
|
Subversion version of the source code.
|
2005-03-30 19:14:24 +00:00
|
|
|
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>
|
2003-10-02 04:57:28 +00:00
|
|
|
|
2003-11-22 00:38:41 +00:00
|
|
|
<p>If you have any questions or comments about LLVM, please feel free to contact
|
2005-10-29 07:07:09 +00:00
|
|
|
us via the <a href="http://llvm.org/docs/#maillist"> mailing
|
2003-12-12 21:22:16 +00:00
|
|
|
lists</a>.</p>
|
2003-10-02 04:57:28 +00:00
|
|
|
|
2003-11-22 00:38:41 +00:00
|
|
|
</div>
|
2003-10-02 04:57:28 +00:00
|
|
|
|
|
|
|
|
<!-- *********************************************************************** -->
|
|
|
|
|
|
2003-11-22 00:38:41 +00:00
|
|
|
<hr>
|
2003-11-22 01:23:39 +00:00
|
|
|
<address>
|
2003-12-21 22:53:21 +00:00
|
|
|
<a href="http://jigsaw.w3.org/css-validator/check/referer"><img
|
2003-11-22 01:23:39 +00:00
|
|
|
src="http://jigsaw.w3.org/css-validator/images/vcss" alt="Valid CSS!"></a>
|
|
|
|
|
<a href="http://validator.w3.org/check/referer"><img
|
2008-02-10 08:18:42 +00:00
|
|
|
src="http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01!"></a>
|
2003-11-22 01:23:39 +00:00
|
|
|
|
2007-05-18 00:44:29 +00:00
|
|
|
<a href="http://llvm.org/">LLVM Compiler Infrastructure</a><br>
|
2003-11-22 00:38:41 +00:00
|
|
|
Last modified: $Date$
|
2003-11-22 01:23:39 +00:00
|
|
|
</address>
|
2003-10-02 04:57:28 +00:00
|
|
|
|
2003-11-22 00:38:41 +00:00
|
|
|
</body>
|
|
|
|
|
</html>
|
