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<html>
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<link rel="stylesheet" href="llvm.css" type="text/css">
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<title>LLVM 2.7 Release Notes</title>
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2003-11-22 00:38:41 +00:00
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</head>
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<body>
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2010-01-28 01:14:43 +00:00
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<div class="doc_title">LLVM 2.7 Release Notes</div>
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2008-10-13 02:08:34 +00:00
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2003-10-02 04:57:28 +00:00
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<ol>
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<li><a href="#intro">Introduction</a></li>
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<li><a href="#subproj">Sub-project Status Update</a></li>
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<li><a href="#externalproj">External Projects Using LLVM 2.7</a></li>
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<li><a href="#whatsnew">What's New in LLVM 2.7?</a></li>
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2004-04-30 22:17:12 +00:00
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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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2008-10-14 16:23:02 +00:00
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<li><a href="#knownproblems">Known Problems</a></li>
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<li><a href="#additionalinfo">Additional Information</a></li>
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</ol>
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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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2003-11-22 00:38:41 +00:00
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</div>
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2003-10-02 04:57:28 +00:00
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2010-01-28 01:14:43 +00:00
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<h1 style="color:red">These are in-progress notes for the upcoming LLVM 2.7
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release.<br>
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You may prefer the
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<a href="http://llvm.org/releases/2.6/docs/ReleaseNotes.html">LLVM 2.6
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Release Notes</a>.</h1>
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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_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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2008-10-13 17:57:36 +00:00
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<p>This document contains the release notes for the LLVM Compiler
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2010-01-28 01:14:43 +00:00
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Infrastructure, release 2.7. Here we describe the status of LLVM, including
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2008-10-13 17:57:36 +00:00
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major improvements from the previous release and significant known problems.
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2009-03-01 18:09:47 +00:00
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All LLVM releases may be downloaded from the <a
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2008-10-13 17:57:36 +00:00
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href="http://llvm.org/releases/">LLVM 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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2005-10-29 07:07:09 +00:00
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release, please check out the <a href="http://llvm.org/">main LLVM
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2003-10-07 21:38:31 +00:00
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web site</a>. If you have questions or comments, the <a
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2008-10-13 17:57:36 +00:00
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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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2003-10-02 04:57:28 +00:00
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2008-10-13 02:08:34 +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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2008-10-14 11:00:32 +00:00
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current one. To see the release notes for a specific release, please see the
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2007-09-21 03:54:09 +00:00
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<a href="http://llvm.org/releases/">releases page</a>.</p>
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2003-11-22 00:38:41 +00:00
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</div>
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2009-10-13 17:48:04 +00:00
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<!--
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Almost dead code.
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include/llvm/Analysis/LiveValues.h => Dan
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lib/Transforms/IPO/MergeFunctions.cpp => consider for 2.8.
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llvm/Analysis/PointerTracking.h => Edwin wants this, consider for 2.8.
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2010-01-09 22:30:40 +00:00
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ABCD, SCCVN, GEPSplitterPass
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2010-01-16 21:25:13 +00:00
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MSIL backend?
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2009-10-13 17:48:04 +00:00
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-->
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2010-01-28 01:14:43 +00:00
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<!-- Features that need text if they're finished for 2.7:
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gcc plugin.
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strong phi elim
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variable debug info for optimized code
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2009-02-26 22:33:38 +00:00
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postalloc scheduler: anti dependence breaking, hazard recognizer?
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2009-10-13 17:48:04 +00:00
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metadata
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loop dependence analysis
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ELF Writer? How stable?
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<li>PostRA scheduler improvements, ARM adoption (David Goodwin).</li>
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2.7 supports the GDB 7.0 jit interfaces for debug info.
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2.7 eliminates ADT/iterator.h
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2008-02-10 07:46:44 +00:00
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-->
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2008-10-13 02:08:34 +00:00
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2008-10-12 19:47:48 +00:00
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<!-- for announcement email:
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2009-10-13 17:48:04 +00:00
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Logo web page.
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llvm devmtg
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compiler_rt
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KLEE web page at klee.llvm.org
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Many new papers added to /pubs/
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Mention gcc plugin.
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2009-02-25 06:34:50 +00:00
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-->
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2008-02-10 07:46:44 +00:00
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2008-10-13 18:01:01 +00:00
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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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2006-04-18 06:18:36 +00:00
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</div>
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2008-10-13 18:01:01 +00:00
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<!-- *********************************************************************** -->
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2006-04-18 06:18:36 +00:00
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2007-05-14 06:56:09 +00:00
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<div class="doc_text">
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2008-06-08 21:34:41 +00:00
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<p>
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The LLVM 2.7 distribution currently consists of code from the core LLVM
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repository (which roughly includes the LLVM optimizers, code generators
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and supporting tools), the Clang repository and the llvm-gcc repository. In
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addition to this code, the LLVM Project includes other sub-projects that are in
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development. Here we include updates on these subprojects.
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2009-03-02 04:28:57 +00:00
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</p>
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2008-06-05 06:57:39 +00:00
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2008-06-08 21:58:17 +00:00
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</div>
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2008-06-05 06:57:39 +00:00
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2008-06-08 21:58:17 +00:00
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<!--=========================================================================-->
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2008-10-13 18:01:01 +00:00
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<div class="doc_subsection">
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2008-10-13 18:11:54 +00:00
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<a name="clang">Clang: C/C++/Objective-C Frontend Toolkit</a>
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2008-06-08 21:58:17 +00:00
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</div>
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<div class="doc_text">
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2010-01-28 01:14:43 +00:00
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<p>The <a href="http://clang.llvm.org/">Clang project</a> is ...</p>
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<p>In the LLVM 2.7 time-frame, the Clang team has made many improvements:</p>
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2008-10-27 09:27:33 +00:00
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2008-10-14 23:25:09 +00:00
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<ul>
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<li>...</li>
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2009-03-02 04:28:18 +00:00
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</ul>
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2008-10-13 18:11:54 +00:00
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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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2010-01-28 01:14:43 +00:00
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<p>Previously announced in the 2.4, 2.5, and 2.6 LLVM releases, the Clang project also
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2009-02-27 07:01:32 +00:00
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includes an early stage static source code analysis tool for <a
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href="http://clang.llvm.org/StaticAnalysis.html">automatically finding bugs</a>
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in C and Objective-C programs. The tool performs checks to find
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2009-02-27 07:01:32 +00:00
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bugs that occur on a specific path within a program.</p>
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2010-01-28 01:14:43 +00:00
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<p>In the LLVM 2.7 time-frame, the analyzer core has ...</p>
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2008-06-08 21:58:17 +00:00
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</div>
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2008-10-13 18:01:01 +00:00
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<!--=========================================================================-->
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<div class="doc_subsection">
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2008-10-14 19:23:04 +00:00
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<a name="vmkit">VMKit: JVM/CLI Virtual Machine Implementation</a>
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2008-10-13 18:01:01 +00:00
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</div>
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<div class="doc_text">
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<p>
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2008-10-14 19:23:04 +00:00
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The <a href="http://vmkit.llvm.org/">VMKit project</a> is an implementation of
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2009-10-13 17:48:04 +00:00
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a JVM and a CLI Virtual Machine (Microsoft .NET is an
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implementation of the CLI) using LLVM for static and just-in-time
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compilation.</p>
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2008-10-13 18:01:01 +00:00
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2009-10-13 17:48:04 +00:00
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<p>
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VMKit version ?? builds with LLVM 2.7 and you can find it on its
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2009-10-13 17:48:04 +00:00
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<a href="http://vmkit.llvm.org/releases/">web page</a>. The release includes
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2008-10-15 20:25:04 +00:00
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bug fixes, cleanup and new features. The major changes are:</p>
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2008-10-13 18:01:01 +00:00
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2008-10-14 19:23:04 +00:00
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<ul>
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2010-01-28 01:14:43 +00:00
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<li>...</li>
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2009-02-26 05:20:36 +00:00
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2009-10-13 17:48:04 +00:00
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</ul>
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</div>
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2009-02-26 05:20:36 +00:00
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2009-03-02 09:25:38 +00:00
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2009-10-13 17:48:04 +00:00
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<!--=========================================================================-->
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<div class="doc_subsection">
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<a name="compiler-rt">compiler-rt: Compiler Runtime Library</a>
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</div>
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2009-03-02 09:25:38 +00:00
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2009-10-13 17:48:04 +00:00
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<div class="doc_text">
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<p>
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The new LLVM <a href="http://compiler-rt.llvm.org/">compiler-rt project</a>
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is a simple library that provides an implementation of the low-level
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target-specific hooks required by code generation and other runtime components.
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For example, when compiling for a 32-bit target, converting a double to a 64-bit
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unsigned integer is compiled into a runtime call to the "__fixunsdfdi"
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function. The compiler-rt library provides highly optimized implementations of
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this and other low-level routines (some are 3x faster than the equivalent
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libgcc routines).</p>
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2008-10-14 19:23:04 +00:00
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2009-10-13 17:48:04 +00:00
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<p>
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All of the code in the compiler-rt project is available under the standard LLVM
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License, a "BSD-style" license.</p>
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</div>
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<!--=========================================================================-->
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<div class="doc_subsection">
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<a name="klee">KLEE: Symbolic Execution and Automatic Test Case Generator</a>
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2008-10-13 18:01:01 +00:00
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</div>
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2009-10-13 17:48:04 +00:00
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<div class="doc_text">
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<p>
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The new LLVM <a href="http://klee.llvm.org/">KLEE project</a> is a symbolic
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execution framework for programs in LLVM bitcode form. KLEE tries to
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symbolically evaluate "all" paths through the application and records state
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transitions that lead to fault states. This allows it to construct testcases
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that lead to faults and can even be used to verify algorithms. For more
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details, please see the <a
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href="http://llvm.org/pubs/2008-12-OSDI-KLEE.html">OSDI 2008 paper</a> about
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KLEE.</p>
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</div>
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<!--=========================================================================-->
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<div class="doc_subsection">
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<a name="dragonegg">DragonEgg: GCC-4.5 as an LLVM frontend</a>
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</div>
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<div class="doc_text">
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<p>
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The goal of <a href="http://dragonegg.llvm.org/">DragonEgg</a> is to make
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gcc-4.5 act like llvm-gcc without requiring any gcc modifications whatsoever.
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2009-10-15 08:17:44 +00:00
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<a href="http://dragonegg.llvm.org/">DragonEgg</a> is a shared library (dragonegg.so)
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2010-01-28 01:14:43 +00:00
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that is loaded by gcc at runtime. It ...
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2009-10-13 17:48:04 +00:00
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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="mc">llvm-mc: Machine Code Toolkit</a>
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</div>
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<div class="doc_text">
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<p>
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2010-01-28 01:14:43 +00:00
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The LLVM Machine Code (MC) Toolkit project is ...
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2009-10-13 17:48:04 +00:00
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</p>
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</div>
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2009-02-26 22:33:38 +00:00
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<!-- *********************************************************************** -->
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<div class="doc_section">
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2010-01-28 01:14:43 +00:00
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<a name="externalproj">External Open Source Projects Using LLVM 2.7</a>
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2009-02-26 22:33:38 +00:00
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</div>
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<!-- *********************************************************************** -->
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2009-10-13 17:48:04 +00:00
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<div class="doc_text">
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<p>An exciting aspect of LLVM is that it is used as an enabling technology for
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a lot of other language and tools projects. This section lists some of the
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2010-01-28 01:14:43 +00:00
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projects that have already been updated to work with LLVM 2.7.</p>
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2009-10-13 17:48:04 +00:00
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</div>
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<!--=========================================================================-->
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<div class="doc_subsection">
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<a name="Rubinius">Rubinius</a>
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</div>
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<div class="doc_text">
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<p><a href="http://github.com/evanphx/rubinius">Rubinius</a> is an environment
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for running Ruby code which strives to write as much of the core class
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implementation in Ruby as possible. Combined with a bytecode interpreting VM, it
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uses LLVM to optimize and compile ruby code down to machine code. Techniques
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|
such as type feedback, method inlining, and uncommon traps are all used to
|
|
|
|
|
remove dynamism from ruby execution and increase performance.</p>
|
|
|
|
|
|
|
|
|
|
<p>Since LLVM 2.5, Rubinius has made several major leaps forward, implementing
|
|
|
|
|
a counter based JIT, type feedback and speculative method inlining.
|
|
|
|
|
</p>
|
|
|
|
|
|
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
<!--=========================================================================-->
|
|
|
|
|
<div class="doc_subsection">
|
|
|
|
|
<a name="macruby">MacRuby</a>
|
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
<div class="doc_text">
|
|
|
|
|
|
|
|
|
|
<p>
|
|
|
|
|
<a href="http://macruby.org">MacRuby</a> is an implementation of Ruby on top of
|
|
|
|
|
core Mac OS X technologies, such as the Objective-C common runtime and garbage
|
|
|
|
|
collector and the CoreFoundation framework. It is principally developed by
|
|
|
|
|
Apple and aims at enabling the creation of full-fledged Mac OS X applications.
|
|
|
|
|
</p>
|
|
|
|
|
|
|
|
|
|
<p>
|
|
|
|
|
MacRuby uses LLVM for optimization passes, JIT and AOT compilation of Ruby
|
|
|
|
|
expressions. It also uses zero-cost DWARF exceptions to implement Ruby exception
|
|
|
|
|
handling.</p>
|
|
|
|
|
|
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
|
2009-02-26 22:33:38 +00:00
|
|
|
<!--=========================================================================-->
|
|
|
|
|
<div class="doc_subsection">
|
|
|
|
|
<a name="pure">Pure</a>
|
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
<div class="doc_text">
|
|
|
|
|
<p>
|
2009-03-02 02:37:32 +00:00
|
|
|
<a href="http://pure-lang.googlecode.com/">Pure</a>
|
|
|
|
|
is an algebraic/functional programming language based on term rewriting.
|
2009-02-26 22:33:38 +00:00
|
|
|
Programs are collections of equations which are used to evaluate expressions in
|
|
|
|
|
a symbolic fashion. Pure offers dynamic typing, eager and lazy evaluation,
|
2009-03-01 18:09:47 +00:00
|
|
|
lexical closures, a hygienic macro system (also based on term rewriting),
|
2009-02-26 22:33:38 +00:00
|
|
|
built-in list and matrix support (including list and matrix comprehensions) and
|
|
|
|
|
an easy-to-use C interface. The interpreter uses LLVM as a backend to
|
|
|
|
|
JIT-compile Pure programs to fast native code.</p>
|
|
|
|
|
|
2010-01-28 01:14:43 +00:00
|
|
|
<p>Pure versions ??? and later have been tested and are known to work with
|
|
|
|
|
LLVM 2.7 (and continue to work with older LLVM releases >= 2.3 as well).
|
2009-02-26 22:33:38 +00:00
|
|
|
</p>
|
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<!--=========================================================================-->
|
|
|
|
|
<div class="doc_subsection">
|
|
|
|
|
<a name="ldc">LLVM D Compiler</a>
|
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
<div class="doc_text">
|
|
|
|
|
<p>
|
2009-03-02 02:37:32 +00:00
|
|
|
<a href="http://www.dsource.org/projects/ldc">LDC</a> is an implementation of
|
|
|
|
|
the D Programming Language using the LLVM optimizer and code generator.
|
2009-10-13 17:48:04 +00:00
|
|
|
The LDC project works great with the LLVM 2.6 release. General improvements in
|
2009-03-02 15:28:15 +00:00
|
|
|
this
|
2009-03-02 02:37:32 +00:00
|
|
|
cycle have included new inline asm constraint handling, better debug info
|
2009-10-13 17:48:04 +00:00
|
|
|
support, general bug fixes and better x86-64 support. This has allowed
|
|
|
|
|
some major improvements in LDC, getting it much closer to being as
|
2009-02-26 22:33:38 +00:00
|
|
|
fully featured as the original DMD compiler from DigitalMars.
|
|
|
|
|
</p>
|
|
|
|
|
</div>
|
|
|
|
|
|
2009-02-28 18:58:01 +00:00
|
|
|
<!--=========================================================================-->
|
|
|
|
|
<div class="doc_subsection">
|
|
|
|
|
<a name="RoadsendPHP">Roadsend PHP</a>
|
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
<div class="doc_text">
|
2009-10-13 17:48:04 +00:00
|
|
|
<p>
|
|
|
|
|
<a href="http://code.roadsend.com/rphp">Roadsend PHP</a> (rphp) is an open
|
2009-03-02 19:07:24 +00:00
|
|
|
source implementation of the PHP programming
|
2009-10-13 17:48:04 +00:00
|
|
|
language that uses LLVM for its optimizer, JIT and static compiler. This is a
|
2009-03-02 19:07:24 +00:00
|
|
|
reimplementation of an earlier project that is now based on LLVM.</p>
|
2009-02-28 18:58:01 +00:00
|
|
|
</div>
|
2009-02-26 22:33:38 +00:00
|
|
|
|
2009-10-13 17:48:04 +00:00
|
|
|
<!--=========================================================================-->
|
|
|
|
|
<div class="doc_subsection">
|
|
|
|
|
<a name="UnladenSwallow">Unladen Swallow</a>
|
2008-06-08 21:58:17 +00:00
|
|
|
</div>
|
|
|
|
|
|
2008-06-08 22:59:35 +00:00
|
|
|
<div class="doc_text">
|
2009-10-13 17:48:04 +00:00
|
|
|
<p>
|
|
|
|
|
<a href="http://code.google.com/p/unladen-swallow/">Unladen Swallow</a> is a
|
|
|
|
|
branch of <a href="http://python.org/">Python</a> intended to be fully
|
|
|
|
|
compatible and significantly faster. It uses LLVM's optimization passes and JIT
|
|
|
|
|
compiler.</p>
|
2008-06-08 22:59:35 +00:00
|
|
|
</div>
|
|
|
|
|
|
2008-06-08 21:34:41 +00:00
|
|
|
<!--=========================================================================-->
|
|
|
|
|
<div class="doc_subsection">
|
2009-10-13 17:48:04 +00:00
|
|
|
<a name="llvm-lua">llvm-lua</a>
|
2008-06-08 21:34:41 +00:00
|
|
|
</div>
|
2008-06-05 18:39:01 +00:00
|
|
|
|
2008-06-08 21:34:41 +00:00
|
|
|
<div class="doc_text">
|
2009-10-13 17:48:04 +00:00
|
|
|
<p>
|
|
|
|
|
<a href="http://code.google.com/p/llvm-lua/">LLVM-Lua</a> uses LLVM to add JIT
|
|
|
|
|
and static compiling support to the Lua VM. Lua bytecode is analyzed to
|
|
|
|
|
remove type checks, then LLVM is used to compile the bytecode down to machine
|
|
|
|
|
code.</p>
|
|
|
|
|
</div>
|
2008-06-05 06:57:39 +00:00
|
|
|
|
2009-10-13 17:48:04 +00:00
|
|
|
<!--=========================================================================-->
|
|
|
|
|
<div class="doc_subsection">
|
|
|
|
|
<a name="icedtea">IcedTea Java Virtual Machine Implementation</a>
|
|
|
|
|
</div>
|
2008-06-05 06:57:39 +00:00
|
|
|
|
2009-10-13 17:48:04 +00:00
|
|
|
<div class="doc_text">
|
|
|
|
|
<p>
|
|
|
|
|
<a href="http://icedtea.classpath.org/wiki/Main_Page">IcedTea</a> provides a
|
|
|
|
|
harness to build OpenJDK using only free software build tools and to provide
|
|
|
|
|
replacements for the not-yet free parts of OpenJDK. One of the extensions that
|
|
|
|
|
IcedTea provides is a new JIT compiler named <a
|
|
|
|
|
href="http://icedtea.classpath.org/wiki/ZeroSharkFaq">Shark</a> which uses LLVM
|
|
|
|
|
to provide native code generation without introducing processor-dependent
|
|
|
|
|
code.
|
|
|
|
|
</p>
|
|
|
|
|
</div>
|
2009-02-25 06:34:50 +00:00
|
|
|
|
|
|
|
|
|
2009-02-26 07:29:17 +00:00
|
|
|
|
2009-10-13 17:48:04 +00:00
|
|
|
<!-- *********************************************************************** -->
|
|
|
|
|
<div class="doc_section">
|
2010-01-28 01:14:43 +00:00
|
|
|
<a name="whatsnew">What's New in LLVM 2.7?</a>
|
2009-10-13 17:48:04 +00:00
|
|
|
</div>
|
|
|
|
|
<!-- *********************************************************************** -->
|
2009-02-26 07:29:17 +00:00
|
|
|
|
2009-10-13 17:48:04 +00:00
|
|
|
<div class="doc_text">
|
2008-06-05 06:57:39 +00:00
|
|
|
|
2009-10-13 17:48:04 +00:00
|
|
|
<p>This release includes a huge number of bug fixes, performance tweaks and
|
|
|
|
|
minor improvements. Some of the major improvements and new features are listed
|
|
|
|
|
in this section.
|
|
|
|
|
</p>
|
2008-02-06 18:00:06 +00:00
|
|
|
|
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
<!--=========================================================================-->
|
|
|
|
|
<div class="doc_subsection">
|
2009-10-13 17:48:04 +00:00
|
|
|
<a name="majorfeatures">Major New Features</a>
|
2008-02-06 18:00:06 +00:00
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
<div class="doc_text">
|
|
|
|
|
|
2010-01-28 01:14:43 +00:00
|
|
|
<p>LLVM 2.7 includes several major new capabilities:</p>
|
2008-02-06 18:00:06 +00:00
|
|
|
|
2008-06-08 22:59:35 +00:00
|
|
|
<ul>
|
2010-01-28 01:14:43 +00:00
|
|
|
<li>...</li>
|
2008-06-09 06:06:18 +00:00
|
|
|
</ul>
|
2008-06-05 06:25:56 +00:00
|
|
|
|
2007-05-14 06:56:09 +00:00
|
|
|
</div>
|
|
|
|
|
|
2008-02-10 08:17:19 +00:00
|
|
|
<!--=========================================================================-->
|
|
|
|
|
<div class="doc_subsection">
|
2009-03-02 02:37:32 +00:00
|
|
|
<a name="coreimprovements">LLVM IR and Core Improvements</a>
|
2008-02-10 08:17:19 +00:00
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
<div class="doc_text">
|
2009-10-13 17:48:04 +00:00
|
|
|
<p>LLVM IR has several new features for better support of new targets and that
|
|
|
|
|
expose new optimization opportunities:</p>
|
2008-02-10 08:17:19 +00:00
|
|
|
|
2008-06-08 22:59:35 +00:00
|
|
|
<ul>
|
2010-01-28 01:14:43 +00:00
|
|
|
<li>...</li>
|
2008-02-10 08:17:19 +00:00
|
|
|
</ul>
|
2008-10-13 02:08:34 +00:00
|
|
|
|
2008-02-10 08:17:19 +00:00
|
|
|
</div>
|
|
|
|
|
|
2007-09-21 03:54:09 +00:00
|
|
|
<!--=========================================================================-->
|
|
|
|
|
<div class="doc_subsection">
|
2008-02-10 07:46:44 +00:00
|
|
|
<a name="optimizer">Optimizer Improvements</a>
|
2007-09-21 03:54:09 +00:00
|
|
|
</div>
|
2007-05-18 06:33:02 +00:00
|
|
|
|
2006-04-18 06:18:36 +00:00
|
|
|
<div class="doc_text">
|
2007-09-21 03:54:09 +00:00
|
|
|
|
2009-10-13 17:48:04 +00:00
|
|
|
<p>In addition to a large array of minor performance tweaks and bug fixes, this
|
2008-10-13 21:50:36 +00:00
|
|
|
release includes a few major enhancements and additions to the optimizers:</p>
|
2007-09-26 05:44:21 +00:00
|
|
|
|
2006-11-18 07:51:14 +00:00
|
|
|
<ul>
|
2007-05-16 23:25:46 +00:00
|
|
|
|
2010-01-28 01:14:43 +00:00
|
|
|
<li>...</li>
|
2009-03-02 02:37:32 +00:00
|
|
|
|
2009-10-13 17:48:04 +00:00
|
|
|
</ul>
|
|
|
|
|
|
|
|
|
|
</div>
|
2009-03-02 02:37:32 +00:00
|
|
|
|
|
|
|
|
|
2009-10-13 17:48:04 +00:00
|
|
|
<!--=========================================================================-->
|
|
|
|
|
<div class="doc_subsection">
|
|
|
|
|
<a name="executionengine">Interpreter and JIT Improvements</a>
|
|
|
|
|
</div>
|
2009-03-02 02:37:32 +00:00
|
|
|
|
2009-10-13 17:48:04 +00:00
|
|
|
<div class="doc_text">
|
2008-10-12 19:47:48 +00:00
|
|
|
|
2009-10-13 17:48:04 +00:00
|
|
|
<ul>
|
2010-01-29 19:10:38 +00:00
|
|
|
<li>The JIT now <a
|
|
|
|
|
href="http://llvm.org/viewvc/llvm-project?view=rev&revision=85295">defaults
|
|
|
|
|
to compiling eagerly</a> to avoid a race condition in the lazy JIT.
|
|
|
|
|
Clients that still want the lazy JIT can switch it on by calling
|
|
|
|
|
<tt>ExecutionEngine::DisableLazyCompilation(false)</tt>.</li>
|
2008-06-08 02:45:07 +00:00
|
|
|
</ul>
|
|
|
|
|
|
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
<!--=========================================================================-->
|
|
|
|
|
<div class="doc_subsection">
|
2009-03-02 03:24:11 +00:00
|
|
|
<a name="codegen">Target Independent Code Generator Improvements</a>
|
2008-06-08 02:45:07 +00:00
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
<div class="doc_text">
|
|
|
|
|
|
2009-03-01 18:09:47 +00:00
|
|
|
<p>We have put a significant amount of work into the code generator
|
|
|
|
|
infrastructure, which allows us to implement more aggressive algorithms and make
|
|
|
|
|
it run faster:</p>
|
2008-06-08 02:45:07 +00:00
|
|
|
|
|
|
|
|
<ul>
|
2009-03-02 02:37:32 +00:00
|
|
|
|
2010-01-28 01:14:43 +00:00
|
|
|
<li>...</li>
|
2006-11-18 07:51:14 +00:00
|
|
|
</ul>
|
2006-04-18 06:18:36 +00:00
|
|
|
</div>
|
|
|
|
|
|
2009-03-02 02:37:32 +00:00
|
|
|
<!--=========================================================================-->
|
|
|
|
|
<div class="doc_subsection">
|
|
|
|
|
<a name="x86">X86-32 and X86-64 Target Improvements</a>
|
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
<div class="doc_text">
|
|
|
|
|
<p>New features of the X86 target include:
|
|
|
|
|
</p>
|
|
|
|
|
|
|
|
|
|
<ul>
|
2009-03-02 07:54:14 +00:00
|
|
|
|
2010-01-28 01:14:43 +00:00
|
|
|
<li>...</li>
|
2009-10-13 17:48:04 +00:00
|
|
|
|
2009-03-02 02:37:32 +00:00
|
|
|
</ul>
|
|
|
|
|
|
|
|
|
|
</div>
|
2007-09-21 03:54:09 +00:00
|
|
|
|
|
|
|
|
<!--=========================================================================-->
|
|
|
|
|
<div class="doc_subsection">
|
2009-02-26 07:32:11 +00:00
|
|
|
<a name="pic16">PIC16 Target Improvements</a>
|
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
<div class="doc_text">
|
|
|
|
|
<p>New features of the PIC16 target include:
|
|
|
|
|
</p>
|
|
|
|
|
|
|
|
|
|
<ul>
|
2010-01-28 01:14:43 +00:00
|
|
|
<li>...</li>
|
2009-02-26 07:32:11 +00:00
|
|
|
</ul>
|
|
|
|
|
|
|
|
|
|
<p>Things not yet supported:</p>
|
|
|
|
|
|
|
|
|
|
<ul>
|
|
|
|
|
<li>Variable arguments.</li>
|
2009-03-02 03:24:11 +00:00
|
|
|
<li>Interrupts/programs.</li>
|
2009-02-26 07:32:11 +00:00
|
|
|
</ul>
|
|
|
|
|
|
|
|
|
|
</div>
|
|
|
|
|
|
2009-10-13 17:48:04 +00:00
|
|
|
<!--=========================================================================-->
|
|
|
|
|
<div class="doc_subsection">
|
|
|
|
|
<a name="ARM">ARM Target Improvements</a>
|
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
<div class="doc_text">
|
|
|
|
|
<p>New features of the ARM target include:
|
|
|
|
|
</p>
|
|
|
|
|
|
|
|
|
|
<ul>
|
|
|
|
|
|
2010-01-28 01:14:43 +00:00
|
|
|
<li>...</li>
|
2009-10-13 17:48:04 +00:00
|
|
|
</ul>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
</div>
|
2009-02-26 07:32:11 +00:00
|
|
|
|
2009-03-01 02:30:21 +00:00
|
|
|
<!--=========================================================================-->
|
|
|
|
|
<div class="doc_subsection">
|
2009-10-13 17:48:04 +00:00
|
|
|
<a name="OtherTarget">Other Target Specific Improvements</a>
|
2009-03-01 02:30:21 +00:00
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
<div class="doc_text">
|
2009-10-13 17:48:04 +00:00
|
|
|
<p>New features of other targets include:
|
|
|
|
|
</p>
|
2009-03-01 02:30:21 +00:00
|
|
|
|
|
|
|
|
<ul>
|
2010-01-28 01:14:43 +00:00
|
|
|
<li>...</li>
|
2009-10-13 17:48:04 +00:00
|
|
|
</ul>
|
|
|
|
|
|
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
<!--=========================================================================-->
|
|
|
|
|
<div class="doc_subsection">
|
|
|
|
|
<a name="newapis">New Useful APIs</a>
|
|
|
|
|
</div>
|
2009-03-01 02:30:21 +00:00
|
|
|
|
2009-10-13 17:48:04 +00:00
|
|
|
<div class="doc_text">
|
2009-03-01 02:30:21 +00:00
|
|
|
|
2009-10-13 17:48:04 +00:00
|
|
|
<p>This release includes a number of new APIs that are used internally, which
|
|
|
|
|
may also be useful for external clients.
|
|
|
|
|
</p>
|
2009-03-01 02:30:21 +00:00
|
|
|
|
2009-10-13 17:48:04 +00:00
|
|
|
<ul>
|
2010-01-28 01:14:43 +00:00
|
|
|
<li>...</li>
|
2009-10-13 17:48:04 +00:00
|
|
|
</ul>
|
2009-03-01 02:30:21 +00:00
|
|
|
|
|
|
|
|
|
2009-10-13 17:48:04 +00:00
|
|
|
</div>
|
2009-03-01 02:30:21 +00:00
|
|
|
|
2009-10-13 17:48:04 +00:00
|
|
|
<!--=========================================================================-->
|
|
|
|
|
<div class="doc_subsection">
|
|
|
|
|
<a name="otherimprovements">Other Improvements and New Features</a>
|
|
|
|
|
</div>
|
2009-03-01 02:30:21 +00:00
|
|
|
|
2009-10-13 17:48:04 +00:00
|
|
|
<div class="doc_text">
|
|
|
|
|
<p>Other miscellaneous features include:</p>
|
2009-03-01 02:30:21 +00:00
|
|
|
|
2009-10-13 17:48:04 +00:00
|
|
|
<ul>
|
2010-01-28 01:14:43 +00:00
|
|
|
<li>...</li>
|
2009-03-01 02:30:21 +00:00
|
|
|
</ul>
|
2008-06-05 08:02:49 +00:00
|
|
|
|
2008-10-13 02:08:34 +00:00
|
|
|
</div>
|
2008-06-05 08:02:49 +00:00
|
|
|
|
|
|
|
|
|
2008-10-13 17:57:36 +00:00
|
|
|
<!--=========================================================================-->
|
|
|
|
|
<div class="doc_subsection">
|
|
|
|
|
<a name="changes">Major Changes and Removed Features</a>
|
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
<div class="doc_text">
|
|
|
|
|
|
2008-10-13 22:06:31 +00:00
|
|
|
<p>If you're already an LLVM user or developer with out-of-tree changes based
|
2010-01-28 01:14:43 +00:00
|
|
|
on LLVM 2.6, this section lists some "gotchas" that you may run into upgrading
|
2008-10-13 22:06:31 +00:00
|
|
|
from the previous release.</p>
|
2008-10-13 18:01:01 +00:00
|
|
|
|
2008-10-13 22:06:31 +00:00
|
|
|
<ul>
|
2010-02-09 23:03:44 +00:00
|
|
|
<li>The LLVM interpreter now defaults to <em>not</em> using <tt>libffi</tt> even
|
|
|
|
|
if you have it installed. This makes it more likely that an LLVM built on one
|
|
|
|
|
system will work when copied to a similar system. To use <tt>libffi</tt>,
|
|
|
|
|
configure with <tt>--enable-libffi</tt>.
|
|
|
|
|
</li>
|
2008-10-13 22:06:31 +00:00
|
|
|
</ul>
|
2008-10-13 17:57:36 +00:00
|
|
|
|
2008-10-13 22:06:31 +00:00
|
|
|
|
|
|
|
|
<p>In addition, many APIs have changed in this release. Some of the major LLVM
|
|
|
|
|
API changes are:</p>
|
2008-10-13 17:57:36 +00:00
|
|
|
|
|
|
|
|
<ul>
|
2010-01-28 01:41:20 +00:00
|
|
|
<li><tt>ModuleProvider</tt> has been <a
|
|
|
|
|
href="http://llvm.org/viewvc/llvm-project?view=rev&revision=94686">removed</a>
|
|
|
|
|
and its methods moved to <tt>Module</tt> and <tt>GlobalValue</tt>.
|
|
|
|
|
Most clients can remove uses of <tt>ExistingModuleProvider</tt>,
|
|
|
|
|
replace <tt>getBitcodeModuleProvider</tt> with
|
|
|
|
|
<tt>getLazyBitcodeModule</tt>, and pass their <tt>Module</tt> to
|
|
|
|
|
functions that used to accept <tt>ModuleProvider</tt>. Clients who
|
|
|
|
|
wrote their own <tt>ModuleProvider</tt>s will need to derive from
|
|
|
|
|
<tt>GVMaterializer</tt> instead and use
|
|
|
|
|
<tt>Module::setMaterializer</tt> to attach it to a
|
|
|
|
|
<tt>Module</tt>.</li>
|
|
|
|
|
|
|
|
|
|
<li><tt>GhostLinkage</tt> has given up the ghost.
|
|
|
|
|
<tt>GlobalValue</tt>s that have not yet been read from their backing
|
|
|
|
|
storage have the same linkage they will have after being read in.
|
|
|
|
|
Clients must replace calls to
|
|
|
|
|
<tt>GlobalValue::hasNotBeenReadFromBitcode</tt> with
|
|
|
|
|
<tt>GlobalValue::isMaterializable</tt>.</li>
|
2008-10-14 20:03:43 +00:00
|
|
|
</ul>
|
2009-02-25 04:41:31 +00:00
|
|
|
|
2008-10-13 17:57:36 +00:00
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
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>
|
2009-03-01 18:09:47 +00:00
|
|
|
<li>Intel and AMD machines (IA32, X86-64, AMD64, EMT-64) running Red Hat
|
2009-10-13 17:48:04 +00:00
|
|
|
Linux, Fedora Core, FreeBSD and AuroraUX (and probably other unix-like
|
|
|
|
|
systems).</li>
|
2009-03-01 18:09:47 +00:00
|
|
|
<li>PowerPC and X86-based Mac OS X systems, running 10.3 and above in 32-bit
|
2009-10-13 17:48:04 +00:00
|
|
|
and 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>
|
2009-10-16 16:30:58 +00:00
|
|
|
<li>Sun x86 and AMD64 machines running Solaris 10, OpenSolaris 0906.</li>
|
2005-05-13 20:28:15 +00:00
|
|
|
<li>Alpha-based machines running Debian GNU/Linux.</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">
|
|
|
|
|
|
2009-03-01 18:09:47 +00:00
|
|
|
<p>This section contains significant known problems with the LLVM system,
|
2008-11-10 05:40:34 +00:00
|
|
|
listed by component. 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
|
|
|
|
2009-10-13 17:48:04 +00:00
|
|
|
<ul>
|
|
|
|
|
<li>The llvm-gcc bootstrap will fail with some versions of binutils (e.g. 2.15)
|
|
|
|
|
with a message of "<tt><a href="http://llvm.org/PR5004">Error: can not do 8
|
|
|
|
|
byte pc-relative relocation</a></tt>" when building C++ code. We intend to
|
2010-01-28 01:14:43 +00:00
|
|
|
fix this on mainline, but a workaround is to upgrade to binutils 2.17 or
|
|
|
|
|
later.</li>
|
2009-10-13 17:48:04 +00:00
|
|
|
|
|
|
|
|
<li>LLVM will not correctly compile on Solaris and/or OpenSolaris
|
|
|
|
|
using the stock GCC 3.x.x series 'out the box',
|
2009-11-03 21:50:09 +00:00
|
|
|
See: <a href="GettingStarted.html#brokengcc">Broken versions of GCC and other tools</a>.
|
2009-10-13 17:48:04 +00:00
|
|
|
However, A <a href="http://pkg.auroraux.org/GCC">Modern GCC Build</a>
|
|
|
|
|
for x86/x86-64 has been made available from the third party AuroraUX Project
|
|
|
|
|
that has been meticulously tested for bootstrapping LLVM & Clang.</li>
|
|
|
|
|
</ul>
|
|
|
|
|
|
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>
|
2009-10-13 17:48:04 +00:00
|
|
|
<li>The MSIL, Alpha, SPU, MIPS, PIC16, Blackfin, MSP430 and SystemZ backends are
|
|
|
|
|
experimental.</li>
|
2009-03-02 07:54:14 +00:00
|
|
|
<li>The <tt>llc</tt> "<tt>-filetype=asm</tt>" (the default) is the only
|
2009-10-13 17:48:04 +00:00
|
|
|
supported value for this option. The ELF writer is experimental.</li>
|
|
|
|
|
<li>The implementation of Andersen's Alias Analysis has many known bugs.</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>
|
2008-06-08 21:19:07 +00:00
|
|
|
<li>The X86 backend generates inefficient floating point code when configured
|
|
|
|
|
to 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
|
2009-03-02 15:28:15 +00:00
|
|
|
expect small issues to happen. Also, llvm-gcc cannot build the mingw64
|
|
|
|
|
runtime currently due
|
2008-06-08 10:24:13 +00:00
|
|
|
to <a href="http://llvm.org/PR2255">several</a>
|
2009-03-02 15:28:15 +00:00
|
|
|
<a href="http://llvm.org/PR2257">bugs</a> and due to lack of support for
|
|
|
|
|
the
|
|
|
|
|
'u' inline assembly constraint and for X87 floating point inline assembly.</li>
|
2008-06-08 23:05:11 +00:00
|
|
|
<li>The X86-64 backend does not yet support the LLVM IR instruction
|
2009-03-02 02:37:32 +00:00
|
|
|
<tt>va_arg</tt>. Currently, the llvm-gcc and front-ends support variadic
|
2008-06-08 23:05:11 +00:00
|
|
|
argument constructs on X86-64 by lowering them manually.</li>
|
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>
|
2009-10-13 17:48:04 +00:00
|
|
|
<li>Support for the Advanced SIMD (Neon) instruction set is still incomplete
|
|
|
|
|
and not well tested. Some features may not work at all, and the code quality
|
|
|
|
|
may be poor in some cases.</li>
|
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>
|
2009-03-02 15:28:15 +00:00
|
|
|
<li>Compilation for ARM Linux OABI (old ABI) is supported but not fully tested.
|
2007-05-14 06:56:09 +00:00
|
|
|
</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>
|
2009-03-02 15:28:15 +00:00
|
|
|
<li>The SPARC backend only supports the 32-bit SPARC ABI (-m32); it does not
|
2007-05-14 06:56:09 +00:00
|
|
|
support the 64-bit SPARC ABI (-m64).</li>
|
2006-11-18 07:51:14 +00:00
|
|
|
</ul>
|
|
|
|
|
|
|
|
|
|
</div>
|
|
|
|
|
|
2008-10-25 14:56:26 +00:00
|
|
|
<!-- ======================================================================= -->
|
|
|
|
|
<div class="doc_subsection">
|
|
|
|
|
<a name="mips-be">Known problems with the MIPS back-end</a>
|
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
<div class="doc_text">
|
|
|
|
|
|
|
|
|
|
<ul>
|
|
|
|
|
<li>64-bit MIPS targets are not supported yet.</li>
|
|
|
|
|
</ul>
|
|
|
|
|
|
|
|
|
|
</div>
|
|
|
|
|
|
2006-11-18 07:51:14 +00:00
|
|
|
<!-- ======================================================================= -->
|
|
|
|
|
<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">
|
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
|
2009-03-02 12:02:51 +00:00
|
|
|
C++ code compiled with <tt>llc</tt> or native compilers.</li>
|
2008-02-10 13:40:55 +00:00
|
|
|
<li>The C backend does not support all exception handling constructs.</li>
|
2009-02-25 11:51:54 +00:00
|
|
|
<li>The C backend does not support arbitrary precision integers.</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
|
|
|
|
2003-11-22 00:38:41 +00:00
|
|
|
<div class="doc_text">
|
2006-03-03 00:34:26 +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>
|
2008-10-11 18:27:16 +00:00
|
|
|
<li>Exception handling works well on the X86 and PowerPC targets. Currently
|
2008-11-10 05:40:34 +00:00
|
|
|
only Linux and Darwin targets are supported (both 32 and 64 bit).</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
|
|
|
|
2008-10-30 03:58:13 +00:00
|
|
|
<!-- ======================================================================= -->
|
|
|
|
|
<div class="doc_subsection">
|
|
|
|
|
<a name="fortran-fe">Known problems with the llvm-gcc Fortran front-end</a>
|
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
<div class="doc_text">
|
2008-11-04 21:50:59 +00:00
|
|
|
<ul>
|
2008-10-30 03:58:13 +00:00
|
|
|
<li>Fortran support generally works, but there are still several unresolved bugs
|
2009-10-13 17:48:04 +00:00
|
|
|
in <a href="http://llvm.org/bugs/">Bugzilla</a>. Please see the
|
|
|
|
|
tools/gfortran component for details.</li>
|
2008-11-04 21:50:59 +00:00
|
|
|
</ul>
|
2008-10-30 03:58:13 +00:00
|
|
|
</div>
|
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">
|
2009-03-02 15:28:15 +00:00
|
|
|
The llvm-gcc 4.2 Ada compiler works fairly well; however, this is not a mature
|
|
|
|
|
technology, and problems should be expected.
|
2008-02-12 06:29:45 +00:00
|
|
|
<ul>
|
2008-06-08 20:18:35 +00:00
|
|
|
<li>The Ada front-end currently only builds on X86-32. This is mainly due
|
2009-03-02 15:28:15 +00:00
|
|
|
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>
|
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>.
|
2009-02-25 11:59:06 +00:00
|
|
|
This is due to lack of LLVM support for <tt>setjmp</tt>/<tt>longjmp</tt> style
|
|
|
|
|
exception handling, which is used internally by the compiler.
|
2009-10-13 17:48:04 +00:00
|
|
|
Workaround: configure with <tt>--disable-bootstrap</tt>.</li>
|
2008-10-13 17:27:23 +00:00
|
|
|
<li>The c380004, <a href="http://llvm.org/PR2010">c393010</a>
|
|
|
|
|
and <a href="http://llvm.org/PR2421">cxg2021</a> ACATS tests fail
|
2009-02-25 11:59:06 +00:00
|
|
|
(c380004 also fails with gcc-4.2 mainline).
|
|
|
|
|
If the compiler is built with checks disabled then <a href="http://llvm.org/PR2010">c393010</a>
|
|
|
|
|
causes the compiler to go into an infinite loop, using up all system memory.</li>
|
2009-03-02 16:35:57 +00:00
|
|
|
<li>Some GCC specific Ada tests continue to crash the compiler.</li>
|
2009-10-13 17:48:04 +00:00
|
|
|
<li>The <tt>-E</tt> binder option (exception backtraces)
|
2008-02-12 06:29:45 +00:00
|
|
|
<a href="http://llvm.org/PR1982">does not work</a> and will result in programs
|
2009-10-13 17:48:04 +00:00
|
|
|
crashing if an exception is raised. Workaround: do not use <tt>-E</tt>.</li>
|
2008-02-12 06:29:45 +00:00
|
|
|
<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>
|
2008-06-08 21:19:07 +00:00
|
|
|
<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>
|
2008-02-12 06:29:45 +00:00
|
|
|
</ul>
|
|
|
|
|
</div>
|
|
|
|
|
|
2009-10-13 17:48:04 +00:00
|
|
|
<!-- ======================================================================= -->
|
|
|
|
|
<div class="doc_subsection">
|
|
|
|
|
<a name="ocaml-bindings">Known problems with the O'Caml bindings</a>
|
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
<div class="doc_text">
|
|
|
|
|
|
|
|
|
|
<p>The <tt>Llvm.Linkage</tt> module is broken, and has incorrect values. Only
|
|
|
|
|
<tt>Llvm.Linkage.External</tt>, <tt>Llvm.Linkage.Available_externally</tt>, and
|
|
|
|
|
<tt>Llvm.Linkage.Link_once</tt> will be correct. If you need any of the other linkage
|
|
|
|
|
modes, you'll have to write an external C library in order to expose the
|
|
|
|
|
functionality. This has been fixed in the trunk.</p>
|
|
|
|
|
</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
|
2008-12-11 17:34:48 +00:00
|
|
|
src="http://jigsaw.w3.org/css-validator/images/vcss-blue" alt="Valid CSS"></a>
|
2003-11-22 01:23:39 +00:00
|
|
|
<a href="http://validator.w3.org/check/referer"><img
|
2008-12-11 17:34:48 +00:00
|
|
|
src="http://www.w3.org/Icons/valid-html401-blue" 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>
|
