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gerrit-public.fairphone.software / fp2-dev / platform / external / llvm / b5e9770aef7176668cb1a1d97c085c061798cfd3 / . / docs / ReleaseNotes.html
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Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
2 "http://www.w3.org/TR/html4/strict.dtd">
3<html>
4<head>
Reid Spencer6454ed32004-11-18 18:38:58 +0000[diff] [blame]5 <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]6 <link rel="stylesheet" href="llvm.css" type="text/css">
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]7 <title>LLVM 2.7 Release Notes</title>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]8</head>
9<body>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]10
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]11<div class="doc_title">LLVM 2.7 Release Notes</div>
Mikhail Glushenkovea65d7d2008-10-13 02:08:34 +0000[diff] [blame]12
Chris Lattner0e464a92010-03-17 04:02:39 +0000[diff] [blame]13<img align=right src="http://llvm.org/img/DragonSmall.png"
14 width="136" height="136">
15
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]16<ol>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]17 <li><a href="#intro">Introduction</a></li>
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]18 <li><a href="#subproj">Sub-project Status Update</a></li>
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]19 <li><a href="#externalproj">External Projects Using LLVM 2.7</a></li>
20 <li><a href="#whatsnew">What's New in LLVM 2.7?</a></li>
Chris Lattner4b538b92004-04-30 22:17:12 +0000[diff] [blame]21 <li><a href="GettingStarted.html">Installation Instructions</a></li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]22 <li><a href="#portability">Portability and Supported Platforms</a></li>
Dan Gohman44aa9212008-10-14 16:23:02 +0000[diff] [blame]23 <li><a href="#knownproblems">Known Problems</a></li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]24 <li><a href="#additionalinfo">Additional Information</a></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]25</ol>
26
Chris Lattner7911ce22004-05-23 21:07:27 +0000[diff] [blame]27<div class="doc_author">
Dan Gohman44aa9212008-10-14 16:23:02 +0000[diff] [blame]28 <p>Written by the <a href="http://llvm.org">LLVM Team</a></p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]29</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]30
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]31<h1 style="color:red">These are in-progress notes for the upcoming LLVM 2.7
32release.<br>
33You may prefer the
34<a href="http://llvm.org/releases/2.6/docs/ReleaseNotes.html">LLVM 2.6
35Release Notes</a>.</h1>
36
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]37<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]38<div class="doc_section">
39 <a name="intro">Introduction</a>
40</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]41<!-- *********************************************************************** -->
42
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]43<div class="doc_text">
44
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]45<p>This document contains the release notes for the LLVM Compiler
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]46Infrastructure, release 2.7. Here we describe the status of LLVM, including
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]47major improvements from the previous release and significant known problems.
Mikhail Glushenkovf795ef02009-03-01 18:09:47 +0000[diff] [blame]48All LLVM releases may be downloaded from the <a
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]49href="http://llvm.org/releases/">LLVM releases web site</a>.</p>
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]50
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame]51<p>For more information about LLVM, including information about the latest
Chris Lattnerc463b272005-10-29 07:07:09 +0000[diff] [blame]52release, please check out the <a href="http://llvm.org/">main LLVM
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]53web site</a>. If you have questions or comments, the <a
Chris Lattnerc66bfef2010-03-17 04:41:49 +0000[diff] [blame]54href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVM Developer's
55Mailing List</a> is a good place to send them.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]56
Mikhail Glushenkovea65d7d2008-10-13 02:08:34 +0000[diff] [blame]57<p>Note that if you are reading this file from a Subversion checkout or the
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]58main LLVM web page, this document applies to the <i>next</i> release, not the
Gabor Greiffa933f82008-10-14 11:00:32 +0000[diff] [blame]59current one. To see the release notes for a specific release, please see the
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]60<a href="http://llvm.org/releases/">releases page</a>.</p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]61
Chris Lattnerc66bfef2010-03-17 04:41:49 +0000[diff] [blame]62
Chris Lattnerdc910082010-03-17 06:41:58 +0000[diff] [blame]63<p>FIXME: llvm.org moved to new server, mention new logo, Ted and Doug new code
64 owners.</p>
Chris Lattnerc66bfef2010-03-17 04:41:49 +0000[diff] [blame]65
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]66</div>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]67
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]68
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]69<!--
70Almost dead code.
71 include/llvm/Analysis/LiveValues.h => Dan
72 lib/Transforms/IPO/MergeFunctions.cpp => consider for 2.8.
73 llvm/Analysis/PointerTracking.h => Edwin wants this, consider for 2.8.
Chris Lattner76ef2982010-01-09 22:30:40 +0000[diff] [blame]74 ABCD, SCCVN, GEPSplitterPass
Chris Lattner048fe3c2010-01-16 21:25:13 +0000[diff] [blame]75 MSIL backend?
Chris Lattnerdc910082010-03-17 06:41:58 +0000[diff] [blame]76 lib/Transforms/Utils/SSI.cpp -> ABCD depends on it.
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]77-->
78
79
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]80<!-- Features that need text if they're finished for 2.7:
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]81 gcc plugin.
82 strong phi elim
83 variable debug info for optimized code
Chris Lattnerab68e9e2009-02-26 22:33:38 +0000[diff] [blame]84 postalloc scheduler: anti dependence breaking, hazard recognizer?
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]85 metadata
86 loop dependence analysis
87 ELF Writer? How stable?
88 <li>PostRA scheduler improvements, ARM adoption (David Goodwin).</li>
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]89 -->
Mikhail Glushenkovea65d7d2008-10-13 02:08:34 +0000[diff] [blame]90
Chris Lattner547a3912008-10-12 19:47:48 +0000[diff] [blame]91 <!-- for announcement email:
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]92 Logo web page.
93 llvm devmtg
94 compiler_rt
95 KLEE web page at klee.llvm.org
96 Many new papers added to /pubs/
Chris Lattnerdc910082010-03-17 06:41:58 +0000[diff] [blame]97 Mention gcc plugin.
Chris Lattner74c80df2009-02-25 06:34:50 +0000[diff] [blame]98 -->
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]99
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]100<!-- *********************************************************************** -->
101<div class="doc_section">
102 <a name="subproj">Sub-project Status Update</a>
Chris Lattnerea34f642008-06-08 21:34:41 +0000[diff] [blame]103</div>
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]104<!-- *********************************************************************** -->
Chris Lattnerea34f642008-06-08 21:34:41 +0000[diff] [blame]105
106<div class="doc_text">
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]107<p>
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]108The LLVM 2.7 distribution currently consists of code from the core LLVM
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]109repository (which roughly includes the LLVM optimizers, code generators
110and supporting tools), the Clang repository and the llvm-gcc repository. In
111addition to this code, the LLVM Project includes other sub-projects that are in
112development. Here we include updates on these subprojects.
Bill Wendling63d8c552009-03-02 04:28:57 +0000[diff] [blame]113</p>
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]114
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]115</div>
116
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]117
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]118<!--=========================================================================-->
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]119<div class="doc_subsection">
Chris Lattnerfb97b2d2008-10-13 18:11:54 +0000[diff] [blame]120<a name="clang">Clang: C/C++/Objective-C Frontend Toolkit</a>
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]121</div>
122
123<div class="doc_text">
124
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]125<p>The <a href="http://clang.llvm.org/">Clang project</a> is ...</p>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]126
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]127<p>In the LLVM 2.7 time-frame, the Clang team has made many improvements:</p>
Bill Wendling741748a2008-10-27 09:27:33 +0000[diff] [blame]128
Daniel Dunbar13739432008-10-14 23:25:09 +0000[diff] [blame]129<ul>
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]130<li>...</li>
Chris Lattnerdc910082010-03-17 06:41:58 +0000[diff] [blame]131include a link to cxx_compatibility.html
Bill Wendling6bc15282009-03-02 04:28:18 +0000[diff] [blame]132</ul>
Chris Lattnerfb97b2d2008-10-13 18:11:54 +0000[diff] [blame]133</div>
134
135<!--=========================================================================-->
136<div class="doc_subsection">
137<a name="clangsa">Clang Static Analyzer</a>
138</div>
139
140<div class="doc_text">
141
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]142<p>Previously announced in the 2.4, 2.5, and 2.6 LLVM releases, the Clang project also
Ted Kremenek8b3894c2009-02-27 07:01:32 +0000[diff] [blame]143includes an early stage static source code analysis tool for <a
144href="http://clang.llvm.org/StaticAnalysis.html">automatically finding bugs</a>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]145in C and Objective-C programs. The tool performs checks to find
Ted Kremenek8b3894c2009-02-27 07:01:32 +0000[diff] [blame]146bugs that occur on a specific path within a program.</p>
Chris Lattnercc042612008-10-14 00:52:49 +0000[diff] [blame]147
Chris Lattner0e464a92010-03-17 04:02:39 +0000[diff] [blame]148<p>In the LLVM 2.7 time-frame, the analyzer core has sprouted legs and...</p>
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]149
150</div>
151
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]152<!--=========================================================================-->
153<div class="doc_subsection">
Nicolas Geoffray99a4d302008-10-14 19:23:04 +0000[diff] [blame]154<a name="vmkit">VMKit: JVM/CLI Virtual Machine Implementation</a>
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]155</div>
156
157<div class="doc_text">
158<p>
Nicolas Geoffray99a4d302008-10-14 19:23:04 +0000[diff] [blame]159The <a href="http://vmkit.llvm.org/">VMKit project</a> is an implementation of
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]160a JVM and a CLI Virtual Machine (Microsoft .NET is an
161implementation of the CLI) using LLVM for static and just-in-time
162compilation.</p>
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]163
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]164<p>
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]165VMKit version ?? builds with LLVM 2.7 and you can find it on its
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]166<a href="http://vmkit.llvm.org/releases/">web page</a>. The release includes
Nicolas Geoffray56d313d2008-10-15 20:25:04 +0000[diff] [blame]167bug fixes, cleanup and new features. The major changes are:</p>
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]168
Nicolas Geoffray99a4d302008-10-14 19:23:04 +0000[diff] [blame]169<ul>
170
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]171<li>...</li>
Nicolas Geoffray99a4d302008-10-14 19:23:04 +0000[diff] [blame]172
173</ul>
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]174</div>
175
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]176
177<!--=========================================================================-->
178<div class="doc_subsection">
179<a name="compiler-rt">compiler-rt: Compiler Runtime Library</a>
180</div>
181
182<div class="doc_text">
183<p>
184The new LLVM <a href="http://compiler-rt.llvm.org/">compiler-rt project</a>
185is a simple library that provides an implementation of the low-level
186target-specific hooks required by code generation and other runtime components.
187For example, when compiling for a 32-bit target, converting a double to a 64-bit
188unsigned integer is compiled into a runtime call to the "__fixunsdfdi"
189function. The compiler-rt library provides highly optimized implementations of
190this and other low-level routines (some are 3x faster than the equivalent
191libgcc routines).</p>
192
193<p>
194All of the code in the compiler-rt project is available under the standard LLVM
195License, a "BSD-style" license.</p>
196
197</div>
198
199<!--=========================================================================-->
200<div class="doc_subsection">
201<a name="klee">KLEE: Symbolic Execution and Automatic Test Case Generator</a>
202</div>
203
204<div class="doc_text">
205<p>
206The new LLVM <a href="http://klee.llvm.org/">KLEE project</a> is a symbolic
207execution framework for programs in LLVM bitcode form. KLEE tries to
208symbolically evaluate "all" paths through the application and records state
209transitions that lead to fault states. This allows it to construct testcases
210that lead to faults and can even be used to verify algorithms. For more
211details, please see the <a
212href="http://llvm.org/pubs/2008-12-OSDI-KLEE.html">OSDI 2008 paper</a> about
213KLEE.</p>
214
215</div>
216
217<!--=========================================================================-->
218<div class="doc_subsection">
219<a name="dragonegg">DragonEgg: GCC-4.5 as an LLVM frontend</a>
220</div>
221
222<div class="doc_text">
223<p>
224The goal of <a href="http://dragonegg.llvm.org/">DragonEgg</a> is to make
225gcc-4.5 act like llvm-gcc without requiring any gcc modifications whatsoever.
Duncan Sands78a1dcc2009-10-15 08:17:44 +0000[diff] [blame]226<a href="http://dragonegg.llvm.org/">DragonEgg</a> is a shared library (dragonegg.so)
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]227that is loaded by gcc at runtime. It ...
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]228</p>
229
230</div>
231
232
233<!--=========================================================================-->
234<div class="doc_subsection">
235<a name="mc">llvm-mc: Machine Code Toolkit</a>
236</div>
237
238<div class="doc_text">
239<p>
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]240The LLVM Machine Code (MC) Toolkit project is ...
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]241</p>
242
243</div>
244
245
Chris Lattnerab68e9e2009-02-26 22:33:38 +0000[diff] [blame]246<!-- *********************************************************************** -->
247<div class="doc_section">
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]248 <a name="externalproj">External Open Source Projects Using LLVM 2.7</a>
Chris Lattnerab68e9e2009-02-26 22:33:38 +0000[diff] [blame]249</div>
250<!-- *********************************************************************** -->
251
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]252<div class="doc_text">
253
254<p>An exciting aspect of LLVM is that it is used as an enabling technology for
255 a lot of other language and tools projects. This section lists some of the
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]256 projects that have already been updated to work with LLVM 2.7.</p>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]257</div>
258
259
260<!--=========================================================================-->
261<div class="doc_subsection">
262<a name="Rubinius">Rubinius</a>
263</div>
264
265<div class="doc_text">
Chris Lattner0e464a92010-03-17 04:02:39 +0000[diff] [blame]266Need update.
267<!--
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]268<p><a href="http://github.com/evanphx/rubinius">Rubinius</a> is an environment
269for running Ruby code which strives to write as much of the core class
270implementation in Ruby as possible. Combined with a bytecode interpreting VM, it
271uses LLVM to optimize and compile ruby code down to machine code. Techniques
272such as type feedback, method inlining, and uncommon traps are all used to
273remove dynamism from ruby execution and increase performance.</p>
274
275<p>Since LLVM 2.5, Rubinius has made several major leaps forward, implementing
276a counter based JIT, type feedback and speculative method inlining.
Chris Lattner0e464a92010-03-17 04:02:39 +0000[diff] [blame]277-->
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]278</p>
279
280</div>
281
282<!--=========================================================================-->
283<div class="doc_subsection">
284<a name="macruby">MacRuby</a>
285</div>
286
287<div class="doc_text">
288
289<p>
Chris Lattner0e464a92010-03-17 04:02:39 +0000[diff] [blame]290Need update.
291<!--
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]292<a href="http://macruby.org">MacRuby</a> is an implementation of Ruby on top of
293core Mac OS X technologies, such as the Objective-C common runtime and garbage
294collector and the CoreFoundation framework. It is principally developed by
295Apple and aims at enabling the creation of full-fledged Mac OS X applications.
296</p>
297
298<p>
299MacRuby uses LLVM for optimization passes, JIT and AOT compilation of Ruby
300expressions. It also uses zero-cost DWARF exceptions to implement Ruby exception
Chris Lattner0e464a92010-03-17 04:02:39 +0000[diff] [blame]301handling.--> </p>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]302
303</div>
304
305
Chris Lattnerab68e9e2009-02-26 22:33:38 +0000[diff] [blame]306<!--=========================================================================-->
307<div class="doc_subsection">
308<a name="pure">Pure</a>
309</div>
310
311<div class="doc_text">
312<p>
Chris Lattner0e464a92010-03-17 04:02:39 +0000[diff] [blame]313Need update.
314<!--
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]315<a href="http://pure-lang.googlecode.com/">Pure</a>
316is an algebraic/functional programming language based on term rewriting.
Chris Lattnerab68e9e2009-02-26 22:33:38 +0000[diff] [blame]317Programs are collections of equations which are used to evaluate expressions in
318a symbolic fashion. Pure offers dynamic typing, eager and lazy evaluation,
Mikhail Glushenkovf795ef02009-03-01 18:09:47 +0000[diff] [blame]319lexical closures, a hygienic macro system (also based on term rewriting),
Chris Lattnerab68e9e2009-02-26 22:33:38 +0000[diff] [blame]320built-in list and matrix support (including list and matrix comprehensions) and
321an easy-to-use C interface. The interpreter uses LLVM as a backend to
322 JIT-compile Pure programs to fast native code.</p>
323
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]324<p>Pure versions ??? and later have been tested and are known to work with
325LLVM 2.7 (and continue to work with older LLVM releases >= 2.3 as well).
Chris Lattner0e464a92010-03-17 04:02:39 +0000[diff] [blame]326--></p>
Chris Lattnerab68e9e2009-02-26 22:33:38 +0000[diff] [blame]327</div>
328
329
330<!--=========================================================================-->
331<div class="doc_subsection">
332<a name="ldc">LLVM D Compiler</a>
333</div>
334
335<div class="doc_text">
336<p>
Chris Lattner0e464a92010-03-17 04:02:39 +0000[diff] [blame]337Need update.
338<!--
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]339<a href="http://www.dsource.org/projects/ldc">LDC</a> is an implementation of
340the D Programming Language using the LLVM optimizer and code generator.
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]341The LDC project works great with the LLVM 2.6 release. General improvements in
John Criswell524a5dd2009-03-02 15:28:15 +0000[diff] [blame]342this
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]343cycle have included new inline asm constraint handling, better debug info
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]344support, general bug fixes and better x86-64 support. This has allowed
345some major improvements in LDC, getting it much closer to being as
Chris Lattner0e464a92010-03-17 04:02:39 +0000[diff] [blame]346fully featured as the original DMD compiler from DigitalMars.-->
Chris Lattnerab68e9e2009-02-26 22:33:38 +0000[diff] [blame]347</p>
348</div>
349
Chris Lattnerbc31caf2009-02-28 18:58:01 +0000[diff] [blame]350<!--=========================================================================-->
351<div class="doc_subsection">
352<a name="RoadsendPHP">Roadsend PHP</a>
353</div>
354
355<div class="doc_text">
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]356<p>
Chris Lattner0e464a92010-03-17 04:02:39 +0000[diff] [blame]357Need update.
358<!--
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]359<a href="http://code.roadsend.com/rphp">Roadsend PHP</a> (rphp) is an open
Chris Lattnercade8222009-03-02 19:07:24 +0000[diff] [blame]360source implementation of the PHP programming
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]361language that uses LLVM for its optimizer, JIT and static compiler. This is a
Chris Lattner0e464a92010-03-17 04:02:39 +0000[diff] [blame]362reimplementation of an earlier project that is now based on LLVM.
363--> </p>
Chris Lattnerbc31caf2009-02-28 18:58:01 +0000[diff] [blame]364</div>
Chris Lattnerab68e9e2009-02-26 22:33:38 +0000[diff] [blame]365
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]366<!--=========================================================================-->
367<div class="doc_subsection">
368<a name="UnladenSwallow">Unladen Swallow</a>
369</div>
370
371<div class="doc_text">
372<p>
Chris Lattner0e464a92010-03-17 04:02:39 +0000[diff] [blame]373Need update.
374<!--
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]375<a href="http://code.google.com/p/unladen-swallow/">Unladen Swallow</a> is a
376branch of <a href="http://python.org/">Python</a> intended to be fully
377compatible and significantly faster. It uses LLVM's optimization passes and JIT
Chris Lattner0e464a92010-03-17 04:02:39 +0000[diff] [blame]378compiler.-->
379</p>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]380</div>
381
382<!--=========================================================================-->
383<div class="doc_subsection">
384<a name="llvm-lua">llvm-lua</a>
385</div>
386
387<div class="doc_text">
388<p>
Chris Lattner0e464a92010-03-17 04:02:39 +0000[diff] [blame]389Need update.
390<!--
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]391<a href="http://code.google.com/p/llvm-lua/">LLVM-Lua</a> uses LLVM to add JIT
392and static compiling support to the Lua VM. Lua bytecode is analyzed to
393remove type checks, then LLVM is used to compile the bytecode down to machine
Chris Lattner0e464a92010-03-17 04:02:39 +0000[diff] [blame]394code.-->
395</p>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]396</div>
397
398<!--=========================================================================-->
399<div class="doc_subsection">
400<a name="icedtea">IcedTea Java Virtual Machine Implementation</a>
401</div>
402
403<div class="doc_text">
404<p>
Chris Lattner0e464a92010-03-17 04:02:39 +0000[diff] [blame]405Need update.
406<!--
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]407<a href="http://icedtea.classpath.org/wiki/Main_Page">IcedTea</a> provides a
408harness to build OpenJDK using only free software build tools and to provide
409replacements for the not-yet free parts of OpenJDK. One of the extensions that
410IcedTea provides is a new JIT compiler named <a
411href="http://icedtea.classpath.org/wiki/ZeroSharkFaq">Shark</a> which uses LLVM
412to provide native code generation without introducing processor-dependent
Chris Lattner0e464a92010-03-17 04:02:39 +0000[diff] [blame]413code.-->
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]414</p>
415</div>
416
417
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]418
419<!-- *********************************************************************** -->
420<div class="doc_section">
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]421 <a name="whatsnew">What's New in LLVM 2.7?</a>
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]422</div>
423<!-- *********************************************************************** -->
424
Chris Lattnerf8e0b4e2008-06-08 22:59:35 +0000[diff] [blame]425<div class="doc_text">
426
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]427<p>This release includes a huge number of bug fixes, performance tweaks and
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]428minor improvements. Some of the major improvements and new features are listed
429in this section.
Chris Lattnerf8e0b4e2008-06-08 22:59:35 +0000[diff] [blame]430</p>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]431
Chris Lattnerf8e0b4e2008-06-08 22:59:35 +0000[diff] [blame]432</div>
433
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]434<!--=========================================================================-->
Chris Lattnerea34f642008-06-08 21:34:41 +0000[diff] [blame]435<div class="doc_subsection">
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]436<a name="majorfeatures">Major New Features</a>
437</div>
438
439<div class="doc_text">
440
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]441<p>LLVM 2.7 includes several major new capabilities:</p>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]442
443<ul>
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]444<li>...</li>
Chris Lattner8170c102008-02-10 08:18:42 +0000[diff] [blame]445</ul>
446
Chris Lattnerc66bfef2010-03-17 04:41:49 +0000[diff] [blame]447Extensible metadata solid.
448
449Debug info improvements: using metadata instead of llvm.dbg global variables.
450This brings several enhancements including improved compile times.
451
452New instruction selector.
453GHC Haskell ABI/ calling conv support.
454Pre-Alpha support for unions in IR.
455New InlineHint and StackAlignment function attributes
456Code generator MC'ized except for debug info and EH.
457New SCEV AA pass: -scev-aa
458Inliner reuses arrays allocas when inlining multiple callers to reduce stack usage.
459MC encoding and disassembler apis.
460Optimal Edge Profiling?
461Instcombine is now a library, has its own IRBuilder to simplify itself.
462New llvm/Support/Regex.h API. FileCheck now does regex's
Chris Lattnerdc910082010-03-17 06:41:58 +0000[diff] [blame]463Many subtle pointer invalidation bugs in Callgraph have been fixed and it now uses asserting value handles.
464MC Disassembler (with blog post), MCInstPrinter. Many X86 backend and AsmPrinter simplifications
465Various tools like llc and opt now read either .ll or .bc files as input.
466Malloc and free instructions got removed.
467compiler-rt support for ARM.
468completely llvm-gcc NEON support.
469Can transcode from GAS to intel syntax with "llvm-mc foo.s -output-asm-variant=1"
470JIT debug information with GDB 7.0
471New CodeGen Level LICM And CSE (did it make 2.7?)
472CMake can now run tests, what other improvements?
473ARM/Thumb register scavenging improvements?
474New SSAUpdater and MachineSSAUpdater classes for unstructured ssa updating,
475 changed jump threading, GVN, etc to use it which simplified them and speed
476 them up.
Chris Lattner15a06112010-03-17 06:42:25 +0000[diff] [blame]477Combiner-AA improvements, why not on by default?
Chris Lattnerc66bfef2010-03-17 04:41:49 +0000[diff] [blame]478
Chris Lattnerdc910082010-03-17 06:41:58 +0000[diff] [blame]479CondProp pass removed (functionality merged into jump threading).
Chris Lattnerc66bfef2010-03-17 04:41:49 +0000[diff] [blame]480AndersAA got removed (from 2.7 or mainline?)
Chris Lattnerdc910082010-03-17 06:41:58 +0000[diff] [blame]481PredSimplify, LoopVR, GVNPRE got removed.
Chris Lattnerc66bfef2010-03-17 04:41:49 +0000[diff] [blame]482LLVM command line tools now overwrite their output, before they would only do this with -f.
483DOUT removed, use DEBUG(errs() instead.
484Much stuff converted to use raw_ostream instead of std::ostream.
485TargetAsmInfo renamed to MCAsmInfo
486llvm/ADT/iterator.h gone.
487
Chris Lattnerdc910082010-03-17 06:41:58 +0000[diff] [blame]488
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]489</div>
490
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]491<!--=========================================================================-->
492<div class="doc_subsection">
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]493<a name="coreimprovements">LLVM IR and Core Improvements</a>
Chris Lattnerf304ffc2008-02-10 08:17:19 +0000[diff] [blame]494</div>
495
496<div class="doc_text">
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]497<p>LLVM IR has several new features for better support of new targets and that
498expose new optimization opportunities:</p>
Chris Lattnerf304ffc2008-02-10 08:17:19 +0000[diff] [blame]499
Chris Lattner791f77b2008-06-05 06:25:56 +0000[diff] [blame]500<ul>
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]501<li>...</li>
Chris Lattnerf304ffc2008-02-10 08:17:19 +0000[diff] [blame]502</ul>
Mikhail Glushenkovea65d7d2008-10-13 02:08:34 +0000[diff] [blame]503
Chris Lattnerf304ffc2008-02-10 08:17:19 +0000[diff] [blame]504</div>
505
506<!--=========================================================================-->
507<div class="doc_subsection">
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]508<a name="optimizer">Optimizer Improvements</a>
509</div>
510
511<div class="doc_text">
512
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]513<p>In addition to a large array of minor performance tweaks and bug fixes, this
Chris Lattnerf3013872008-10-13 21:50:36 +0000[diff] [blame]514release includes a few major enhancements and additions to the optimizers:</p>
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]515
516<ul>
517
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]518<li>...</li>
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]519
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]520</ul>
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]521
Chris Lattnerf2201912010-03-01 19:29:17 +0000[diff] [blame]522<p>Also, -anders-aa was removed</p>
523
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]524</div>
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]525
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]526
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]527<!--=========================================================================-->
528<div class="doc_subsection">
529<a name="executionengine">Interpreter and JIT Improvements</a>
530</div>
Chris Lattnerf3013872008-10-13 21:50:36 +0000[diff] [blame]531
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]532<div class="doc_text">
533
534<ul>
Jeffrey Yasskin01eba392010-01-29 19:10:38 +0000[diff] [blame]535<li>The JIT now <a
536href="http://llvm.org/viewvc/llvm-project?view=rev&revision=85295">defaults
537to compiling eagerly</a> to avoid a race condition in the lazy JIT.
538Clients that still want the lazy JIT can switch it on by calling
539<tt>ExecutionEngine::DisableLazyCompilation(false)</tt>.</li>
Jeffrey Yasskin40966a72010-02-11 01:07:39 +0000[diff] [blame]540<li>It is now possible to create more than one JIT instance in the same process.
541These JITs can generate machine code in parallel,
542although <a href="http://llvm.org/docs/ProgrammersManual.html#jitthreading">you
543still have to obey the other threading restrictions</a>.</li>
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]544</ul>
545
546</div>
547
548<!--=========================================================================-->
549<div class="doc_subsection">
Chris Lattner511433e2009-03-02 03:24:11 +0000[diff] [blame]550<a name="codegen">Target Independent Code Generator Improvements</a>
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]551</div>
552
553<div class="doc_text">
554
Mikhail Glushenkovf795ef02009-03-01 18:09:47 +0000[diff] [blame]555<p>We have put a significant amount of work into the code generator
556infrastructure, which allows us to implement more aggressive algorithms and make
557it run faster:</p>
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]558
559<ul>
Chris Lattner511433e2009-03-02 03:24:11 +0000[diff] [blame]560
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]561<li>...</li>
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]562</ul>
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]563</div>
564
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]565<!--=========================================================================-->
566<div class="doc_subsection">
567<a name="x86">X86-32 and X86-64 Target Improvements</a>
568</div>
569
570<div class="doc_text">
571<p>New features of the X86 target include:
572</p>
573
574<ul>
Chris Lattner511433e2009-03-02 03:24:11 +0000[diff] [blame]575
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]576<li>...</li>
Chris Lattner511433e2009-03-02 03:24:11 +0000[diff] [blame]577
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]578</ul>
579
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]580</div>
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]581
582<!--=========================================================================-->
583<div class="doc_subsection">
Chris Lattner11398992009-02-26 07:32:11 +0000[diff] [blame]584<a name="pic16">PIC16 Target Improvements</a>
585</div>
586
587<div class="doc_text">
588<p>New features of the PIC16 target include:
589</p>
590
591<ul>
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]592<li>...</li>
Chris Lattner11398992009-02-26 07:32:11 +0000[diff] [blame]593</ul>
594
595<p>Things not yet supported:</p>
596
597<ul>
Chris Lattner11398992009-02-26 07:32:11 +0000[diff] [blame]598<li>Variable arguments.</li>
Chris Lattner511433e2009-03-02 03:24:11 +0000[diff] [blame]599<li>Interrupts/programs.</li>
Chris Lattner11398992009-02-26 07:32:11 +0000[diff] [blame]600</ul>
601
602</div>
603
Chris Lattner11398992009-02-26 07:32:11 +0000[diff] [blame]604<!--=========================================================================-->
605<div class="doc_subsection">
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]606<a name="ARM">ARM Target Improvements</a>
Chris Lattnerc441fb82009-03-01 02:30:21 +0000[diff] [blame]607</div>
608
609<div class="doc_text">
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]610<p>New features of the ARM target include:
611</p>
Chris Lattnerc441fb82009-03-01 02:30:21 +0000[diff] [blame]612
613<ul>
Chris Lattnerc441fb82009-03-01 02:30:21 +0000[diff] [blame]614
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]615<li>...</li>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]616</ul>
Chris Lattnerc441fb82009-03-01 02:30:21 +0000[diff] [blame]617
Chris Lattnerc441fb82009-03-01 02:30:21 +0000[diff] [blame]618
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]619</div>
Chris Lattnerc441fb82009-03-01 02:30:21 +0000[diff] [blame]620
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]621<!--=========================================================================-->
622<div class="doc_subsection">
623<a name="OtherTarget">Other Target Specific Improvements</a>
624</div>
Chris Lattnerc441fb82009-03-01 02:30:21 +0000[diff] [blame]625
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]626<div class="doc_text">
627<p>New features of other targets include:
628</p>
629
630<ul>
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]631<li>...</li>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]632</ul>
633
634</div>
635
636<!--=========================================================================-->
637<div class="doc_subsection">
638<a name="newapis">New Useful APIs</a>
639</div>
640
641<div class="doc_text">
642
643<p>This release includes a number of new APIs that are used internally, which
644 may also be useful for external clients.
645</p>
646
647<ul>
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]648<li>...</li>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]649</ul>
650
651
652</div>
653
654<!--=========================================================================-->
655<div class="doc_subsection">
656<a name="otherimprovements">Other Improvements and New Features</a>
657</div>
658
659<div class="doc_text">
660<p>Other miscellaneous features include:</p>
661
662<ul>
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]663<li>...</li>
Chris Lattnerc441fb82009-03-01 02:30:21 +0000[diff] [blame]664</ul>
665
666</div>
667
Chris Lattner77d29b12008-06-05 08:02:49 +0000[diff] [blame]668
669<!--=========================================================================-->
670<div class="doc_subsection">
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]671<a name="changes">Major Changes and Removed Features</a>
672</div>
673
674<div class="doc_text">
675
Chris Lattnereeb4da02008-10-13 22:06:31 +0000[diff] [blame]676<p>If you're already an LLVM user or developer with out-of-tree changes based
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]677on LLVM 2.6, this section lists some "gotchas" that you may run into upgrading
Chris Lattnereeb4da02008-10-13 22:06:31 +0000[diff] [blame]678from the previous release.</p>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]679
680<ul>
Jeffrey Yasskinbc83d062010-02-09 23:03:44 +0000[diff] [blame]681<li>The LLVM interpreter now defaults to <em>not</em> using <tt>libffi</tt> even
682if you have it installed. This makes it more likely that an LLVM built on one
683system will work when copied to a similar system. To use <tt>libffi</tt>,
684configure with <tt>--enable-libffi</tt>.
685</li>
Chris Lattnereeb4da02008-10-13 22:06:31 +0000[diff] [blame]686</ul>
687
688
689<p>In addition, many APIs have changed in this release. Some of the major LLVM
690API changes are:</p>
691
692<ul>
Jeffrey Yasskin4fcd6072010-01-28 01:41:20 +0000[diff] [blame]693<li><tt>ModuleProvider</tt> has been <a
694href="http://llvm.org/viewvc/llvm-project?view=rev&revision=94686">removed</a>
695and its methods moved to <tt>Module</tt> and <tt>GlobalValue</tt>.
696Most clients can remove uses of <tt>ExistingModuleProvider</tt>,
697replace <tt>getBitcodeModuleProvider</tt> with
698<tt>getLazyBitcodeModule</tt>, and pass their <tt>Module</tt> to
699functions that used to accept <tt>ModuleProvider</tt>. Clients who
700wrote their own <tt>ModuleProvider</tt>s will need to derive from
701<tt>GVMaterializer</tt> instead and use
702<tt>Module::setMaterializer</tt> to attach it to a
703<tt>Module</tt>.</li>
704
705<li><tt>GhostLinkage</tt> has given up the ghost.
706<tt>GlobalValue</tt>s that have not yet been read from their backing
707storage have the same linkage they will have after being read in.
708Clients must replace calls to
709<tt>GlobalValue::hasNotBeenReadFromBitcode</tt> with
710<tt>GlobalValue::isMaterializable</tt>.</li>
Daniel Dunbar4acdede2010-02-10 04:09:52 +0000[diff] [blame]711
712<li>FIXME: Debug info has been totally redone. Add pointers to new APIs. Substantial caveats about compatibility of .ll and .bc files.</li>
713
Daniel Dunbarca1c8162010-02-14 01:47:19 +0000[diff] [blame]714<li>The <tt>llvm/Support/DataTypes.h</tt> header has moved
715to <tt>llvm/System/DataTypes.h</tt>.</li>
716
Duncan Sands411432d2010-02-17 17:20:17 +0000[diff] [blame]717<li>The <tt>isInteger</tt>, <tt>isIntOrIntVector</tt>, <tt>isFloatingPoint</tt>,
718<tt>isFPOrFPVector</tt> and <tt>isFPOrFPVector</tt> methods have been renamed
719<tt>isIntegerTy</tt>, <tt>isIntOrIntVectorTy</tt>, <tt>isFloatingPointTy</tt>,
720<tt>isFPOrFPVectorTy</tt> and <tt>isFPOrFPVectorTy</tt> respectively.</li>
Devang Patelb34dd132008-10-14 20:03:43 +0000[diff] [blame]721</ul>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]722
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]723</div>
724
725
726
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]727<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]728<div class="doc_section">
729 <a name="portability">Portability and Supported Platforms</a>
730</div>
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]731<!-- *********************************************************************** -->
732
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]733<div class="doc_text">
734
John Criswell0b5b5e92004-12-08 20:35:47 +0000[diff] [blame]735<p>LLVM is known to work on the following platforms:</p>
Chris Lattner4654bdb2004-06-01 18:22:41 +0000[diff] [blame]736
737<ul>
Mikhail Glushenkovf795ef02009-03-01 18:09:47 +0000[diff] [blame]738<li>Intel and AMD machines (IA32, X86-64, AMD64, EMT-64) running Red Hat
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]739 Linux, Fedora Core, FreeBSD and AuroraUX (and probably other unix-like
740 systems).</li>
Mikhail Glushenkovf795ef02009-03-01 18:09:47 +0000[diff] [blame]741<li>PowerPC and X86-based Mac OS X systems, running 10.3 and above in 32-bit
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]742 and 64-bit modes.</li>
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]743<li>Intel and AMD machines running on Win32 using MinGW libraries (native).</li>
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]744<li>Intel and AMD machines running on Win32 with the Cygwin libraries (limited
745 support is available for native builds with Visual C++).</li>
Chris Lattner7e23d6e2009-10-16 16:30:58 +0000[diff] [blame]746<li>Sun x86 and AMD64 machines running Solaris 10, OpenSolaris 0906.</li>
John Criswell9321fa82005-05-13 20:28:15 +0000[diff] [blame]747<li>Alpha-based machines running Debian GNU/Linux.</li>
Chris Lattner4654bdb2004-06-01 18:22:41 +0000[diff] [blame]748</ul>
749
Chris Lattnerbc5786b2008-06-05 06:57:39 +0000[diff] [blame]750<p>The core LLVM infrastructure uses GNU autoconf to adapt itself
Brian Gaekeb0fd7612004-05-09 05:28:35 +0000[diff] [blame]751to the machine and operating system on which it is built. However, minor
752porting may be required to get LLVM to work on new platforms. We welcome your
753portability patches and reports of successful builds or error messages.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]754
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]755</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]756
757<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]758<div class="doc_section">
759 <a name="knownproblems">Known Problems</a>
760</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]761<!-- *********************************************************************** -->
762
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]763<div class="doc_text">
764
Mikhail Glushenkovf795ef02009-03-01 18:09:47 +0000[diff] [blame]765<p>This section contains significant known problems with the LLVM system,
Chris Lattnere18b32e2008-11-10 05:40:34 +0000[diff] [blame]766listed by component. If you run into a problem, please check the <a
Chris Lattnerc463b272005-10-29 07:07:09 +0000[diff] [blame]767href="http://llvm.org/bugs/">LLVM bug database</a> and submit a bug if
Chris Lattner5eccca42003-12-12 21:22:16 +0000[diff] [blame]768there isn't already one.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]769
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]770<ul>
771<li>The llvm-gcc bootstrap will fail with some versions of binutils (e.g. 2.15)
772 with a message of "<tt><a href="http://llvm.org/PR5004">Error: can not do 8
773 byte pc-relative relocation</a></tt>" when building C++ code. We intend to
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]774 fix this on mainline, but a workaround is to upgrade to binutils 2.17 or
775 later.</li>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]776
777<li>LLVM will not correctly compile on Solaris and/or OpenSolaris
778using the stock GCC 3.x.x series 'out the box',
Chris Lattner554ee4a2009-11-03 21:50:09 +0000[diff] [blame]779See: <a href="GettingStarted.html#brokengcc">Broken versions of GCC and other tools</a>.
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]780However, A <a href="http://pkg.auroraux.org/GCC">Modern GCC Build</a>
781for x86/x86-64 has been made available from the third party AuroraUX Project
782that has been meticulously tested for bootstrapping LLVM &amp; Clang.</li>
783</ul>
784
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]785</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]786
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]787<!-- ======================================================================= -->
788<div class="doc_subsection">
789 <a name="experimental">Experimental features included with this release</a>
790</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]791
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]792<div class="doc_text">
793
Misha Brukman6df9e2c2004-05-12 21:46:05 +0000[diff] [blame]794<p>The following components of this LLVM release are either untested, known to
795be broken or unreliable, or are in early development. These components should
796not be relied on, and bugs should not be filed against them, but they may be
797useful to some people. In particular, if you would like to work on one of these
Chris Lattner2b659ef2008-02-12 06:29:45 +0000[diff] [blame]798components, please contact us on the <a
799href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVMdev list</a>.</p>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]800
801<ul>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]802<li>The MSIL, Alpha, SPU, MIPS, PIC16, Blackfin, MSP430 and SystemZ backends are
803 experimental.</li>
Bill Wendling99dac472009-03-02 07:54:14 +0000[diff] [blame]804<li>The <tt>llc</tt> "<tt>-filetype=asm</tt>" (the default) is the only
Chris Lattnerc66bfef2010-03-17 04:41:49 +0000[diff] [blame]805 supported value for this option. The MachO writer is experimental, and
806 works much better in mainline SVN.</li>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]807</ul>
808
809</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]810
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]811<!-- ======================================================================= -->
812<div class="doc_subsection">
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]813 <a name="x86-be">Known problems with the X86 back-end</a>
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]814</div>
815
816<div class="doc_text">
817
818<ul>
Anton Korobeynikova6094be2008-06-08 10:24:13 +0000[diff] [blame]819 <li>The X86 backend does not yet support
820 all <a href="http://llvm.org/PR879">inline assembly that uses the X86
821 floating point stack</a>. It supports the 'f' and 't' constraints, but not
822 'u'.</li>
Chris Lattnere6e1b352008-06-08 21:19:07 +0000[diff] [blame]823 <li>The X86 backend generates inefficient floating point code when configured
824 to generate code for systems that don't have SSE2.</li>
Duncan Sands47eff2b2008-06-08 19:38:43 +0000[diff] [blame]825 <li>Win64 code generation wasn't widely tested. Everything should work, but we
John Criswell524a5dd2009-03-02 15:28:15 +0000[diff] [blame]826 expect small issues to happen. Also, llvm-gcc cannot build the mingw64
827 runtime currently due
Anton Korobeynikova6094be2008-06-08 10:24:13 +0000[diff] [blame]828 to <a href="http://llvm.org/PR2255">several</a>
John Criswell524a5dd2009-03-02 15:28:15 +0000[diff] [blame]829 <a href="http://llvm.org/PR2257">bugs</a> and due to lack of support for
830 the
831 'u' inline assembly constraint and for X87 floating point inline assembly.</li>
Dan Gohman8207ba92008-06-08 23:05:11 +0000[diff] [blame]832 <li>The X86-64 backend does not yet support the LLVM IR instruction
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]833 <tt>va_arg</tt>. Currently, the llvm-gcc and front-ends support variadic
Dan Gohman8207ba92008-06-08 23:05:11 +0000[diff] [blame]834 argument constructs on X86-64 by lowering them manually.</li>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]835</ul>
836
837</div>
838
839<!-- ======================================================================= -->
840<div class="doc_subsection">
841 <a name="ppc-be">Known problems with the PowerPC back-end</a>
842</div>
843
844<div class="doc_text">
845
846<ul>
Nicolas Geoffraye4285dc2007-05-15 09:21:28 +0000[diff] [blame]847<li>The Linux PPC32/ABI support needs testing for the interpreter and static
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]848compilation, and lacks support for debug information.</li>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]849</ul>
850
851</div>
852
853<!-- ======================================================================= -->
854<div class="doc_subsection">
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]855 <a name="arm-be">Known problems with the ARM back-end</a>
856</div>
857
858<div class="doc_text">
859
860<ul>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]861<li>Support for the Advanced SIMD (Neon) instruction set is still incomplete
862and not well tested. Some features may not work at all, and the code quality
863may be poor in some cases.</li>
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]864<li>Thumb mode works only on ARMv6 or higher processors. On sub-ARMv6
Duncan Sandsc90d68b2007-09-26 15:59:54 +0000[diff] [blame]865processors, thumb programs can crash or produce wrong
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]866results (<a href="http://llvm.org/PR1388">PR1388</a>).</li>
John Criswell524a5dd2009-03-02 15:28:15 +0000[diff] [blame]867<li>Compilation for ARM Linux OABI (old ABI) is supported but not fully tested.
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]868</li>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]869</ul>
870
871</div>
872
873<!-- ======================================================================= -->
874<div class="doc_subsection">
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]875 <a name="sparc-be">Known problems with the SPARC back-end</a>
876</div>
877
878<div class="doc_text">
879
880<ul>
John Criswell524a5dd2009-03-02 15:28:15 +0000[diff] [blame]881<li>The SPARC backend only supports the 32-bit SPARC ABI (-m32); it does not
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]882 support the 64-bit SPARC ABI (-m64).</li>
883</ul>
884
885</div>
886
887<!-- ======================================================================= -->
888<div class="doc_subsection">
Bruno Cardoso Lopesb7e1a4f2008-10-25 14:56:26 +0000[diff] [blame]889 <a name="mips-be">Known problems with the MIPS back-end</a>
890</div>
891
892<div class="doc_text">
893
894<ul>
Bruno Cardoso Lopesb7e1a4f2008-10-25 14:56:26 +0000[diff] [blame]895<li>64-bit MIPS targets are not supported yet.</li>
896</ul>
897
898</div>
899
900<!-- ======================================================================= -->
901<div class="doc_subsection">
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]902 <a name="alpha-be">Known problems with the Alpha back-end</a>
903</div>
904
905<div class="doc_text">
906
907<ul>
908
909<li>On 21164s, some rare FP arithmetic sequences which may trap do not have the
910appropriate nops inserted to ensure restartability.</li>
911
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]912</ul>
913</div>
914
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]915<!-- ======================================================================= -->
916<div class="doc_subsection">
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]917 <a name="c-be">Known problems with the C back-end</a>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]918</div>
919
920<div class="doc_text">
921
922<ul>
Chris Lattner5733b272008-06-05 06:35:40 +0000[diff] [blame]923<li><a href="http://llvm.org/PR802">The C backend has only basic support for
924 inline assembly code</a>.</li>
Chris Lattner725a0d82007-09-26 06:01:35 +0000[diff] [blame]925<li><a href="http://llvm.org/PR1658">The C backend violates the ABI of common
926 C++ programs</a>, preventing intermixing between C++ compiled by the CBE and
Gabor Greif4906abe2009-03-02 12:02:51 +0000[diff] [blame]927 C++ code compiled with <tt>llc</tt> or native compilers.</li>
Duncan Sandsf74c0cc2008-02-10 13:40:55 +0000[diff] [blame]928<li>The C backend does not support all exception handling constructs.</li>
Duncan Sands50723a92009-02-25 11:51:54 +0000[diff] [blame]929<li>The C backend does not support arbitrary precision integers.</li>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]930</ul>
931
932</div>
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]933
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]934
935<!-- ======================================================================= -->
936<div class="doc_subsection">
Chris Lattnerc66bfef2010-03-17 04:41:49 +0000[diff] [blame]937 <a name="c-fe">Known problems with the llvm-gcc C and C++ front-end</a>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]938</div>
Chris Lattner47588f92003-10-02 05:07:23 +0000[diff] [blame]939
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]940<div class="doc_text">
Chris Lattnerc5d658a2006-03-03 00:34:26 +0000[diff] [blame]941
Chris Lattner5733b272008-06-05 06:35:40 +0000[diff] [blame]942<p>The only major language feature of GCC not supported by llvm-gcc is
943 the <tt>__builtin_apply</tt> family of builtins. However, some extensions
944 are only supported on some targets. For example, trampolines are only
Duncan Sands27aff872008-06-08 20:18:35 +0000[diff] [blame]945 supported on some targets (these are used when you take the address of a
946 nested function).</p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]947
Chris Lattner5733b272008-06-05 06:35:40 +0000[diff] [blame]948<p>If you run into GCC extensions which are not supported, please let us know.
949</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]950
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]951</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]952
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]953<!-- ======================================================================= -->
954<div class="doc_subsection">
Chris Lattner1eb4df62008-10-30 03:58:13 +0000[diff] [blame]955 <a name="fortran-fe">Known problems with the llvm-gcc Fortran front-end</a>
956</div>
957
958<div class="doc_text">
Gabor Greifba10fe02008-11-04 21:50:59 +0000[diff] [blame]959<ul>
Chris Lattner1eb4df62008-10-30 03:58:13 +0000[diff] [blame]960<li>Fortran support generally works, but there are still several unresolved bugs
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]961 in <a href="http://llvm.org/bugs/">Bugzilla</a>. Please see the
962 tools/gfortran component for details.</li>
Gabor Greifba10fe02008-11-04 21:50:59 +0000[diff] [blame]963</ul>
Chris Lattner1eb4df62008-10-30 03:58:13 +0000[diff] [blame]964</div>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]965
Chris Lattner2b659ef2008-02-12 06:29:45 +0000[diff] [blame]966<!-- ======================================================================= -->
967<div class="doc_subsection">
Chris Lattner5733b272008-06-05 06:35:40 +0000[diff] [blame]968 <a name="ada-fe">Known problems with the llvm-gcc Ada front-end</a>
Chris Lattner2b659ef2008-02-12 06:29:45 +0000[diff] [blame]969</div>
970
971<div class="doc_text">
John Criswell524a5dd2009-03-02 15:28:15 +0000[diff] [blame]972The llvm-gcc 4.2 Ada compiler works fairly well; however, this is not a mature
973technology, and problems should be expected.
Chris Lattner2b659ef2008-02-12 06:29:45 +0000[diff] [blame]974<ul>
Duncan Sands27aff872008-06-08 20:18:35 +0000[diff] [blame]975<li>The Ada front-end currently only builds on X86-32. This is mainly due
John Criswell524a5dd2009-03-02 15:28:15 +0000[diff] [blame]976to lack of trampoline support (pointers to nested functions) on other platforms.
977However, it <a href="http://llvm.org/PR2006">also fails to build on X86-64</a>
Chris Lattner2b659ef2008-02-12 06:29:45 +0000[diff] [blame]978which does support trampolines.</li>
979<li>The Ada front-end <a href="http://llvm.org/PR2007">fails to bootstrap</a>.
Duncan Sands326a4982009-02-25 11:59:06 +0000[diff] [blame]980This is due to lack of LLVM support for <tt>setjmp</tt>/<tt>longjmp</tt> style
981exception handling, which is used internally by the compiler.
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]982Workaround: configure with <tt>--disable-bootstrap</tt>.</li>
Duncan Sands978bcee2008-10-13 17:27:23 +0000[diff] [blame]983<li>The c380004, <a href="http://llvm.org/PR2010">c393010</a>
984and <a href="http://llvm.org/PR2421">cxg2021</a> ACATS tests fail
Duncan Sands326a4982009-02-25 11:59:06 +0000[diff] [blame]985(c380004 also fails with gcc-4.2 mainline).
986If the compiler is built with checks disabled then <a href="http://llvm.org/PR2010">c393010</a>
987causes the compiler to go into an infinite loop, using up all system memory.</li>
Duncan Sandsdd3e6722009-03-02 16:35:57 +0000[diff] [blame]988<li>Some GCC specific Ada tests continue to crash the compiler.</li>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]989<li>The <tt>-E</tt> binder option (exception backtraces)
Chris Lattner2b659ef2008-02-12 06:29:45 +0000[diff] [blame]990<a href="http://llvm.org/PR1982">does not work</a> and will result in programs
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]991crashing if an exception is raised. Workaround: do not use <tt>-E</tt>.</li>
Chris Lattner2b659ef2008-02-12 06:29:45 +0000[diff] [blame]992<li>Only discrete types <a href="http://llvm.org/PR1981">are allowed to start
993or finish at a non-byte offset</a> in a record. Workaround: do not pack records
994or use representation clauses that result in a field of a non-discrete type
995starting or finishing in the middle of a byte.</li>
Chris Lattnere6e1b352008-06-08 21:19:07 +0000[diff] [blame]996<li>The <tt>lli</tt> interpreter <a href="http://llvm.org/PR2009">considers
997'main' as generated by the Ada binder to be invalid</a>.
998Workaround: hand edit the file to use pointers for <tt>argv</tt> and
999<tt>envp</tt> rather than integers.</li>
1000<li>The <tt>-fstack-check</tt> option <a href="http://llvm.org/PR2008">is
1001ignored</a>.</li>
Chris Lattner2b659ef2008-02-12 06:29:45 +0000[diff] [blame]1002</ul>
1003</div>
1004
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]1005<!-- ======================================================================= -->
1006<div class="doc_subsection">
1007 <a name="ocaml-bindings">Known problems with the O'Caml bindings</a>
1008</div>
1009
1010<div class="doc_text">
1011
1012<p>The <tt>Llvm.Linkage</tt> module is broken, and has incorrect values. Only
1013<tt>Llvm.Linkage.External</tt>, <tt>Llvm.Linkage.Available_externally</tt>, and
1014<tt>Llvm.Linkage.Link_once</tt> will be correct. If you need any of the other linkage
1015modes, you'll have to write an external C library in order to expose the
1016functionality. This has been fixed in the trunk.</p>
1017</div>
1018
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1019<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1020<div class="doc_section">
1021 <a name="additionalinfo">Additional Information</a>
1022</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1023<!-- *********************************************************************** -->
1024
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1025<div class="doc_text">
1026
Chris Lattner416db102005-05-16 17:13:10 +0000[diff] [blame]1027<p>A wide variety of additional information is available on the <a
Chris Lattnerb4b0ce72007-05-18 00:44:29 +0000[diff] [blame]1028href="http://llvm.org">LLVM web page</a>, in particular in the <a
1029href="http://llvm.org/docs/">documentation</a> section. The web page also
Reid Spencer669ed452007-07-09 08:04:31 +0000[diff] [blame]1030contains versions of the API documentation which is up-to-date with the
1031Subversion version of the source code.
Misha Brukman109d9e82005-03-30 19:14:24 +0000[diff] [blame]1032You can access versions of these documents specific to this release by going
1033into the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1034
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1035<p>If you have any questions or comments about LLVM, please feel free to contact
Chris Lattnerc463b272005-10-29 07:07:09 +0000[diff] [blame]1036us via the <a href="http://llvm.org/docs/#maillist"> mailing
Chris Lattner5eccca42003-12-12 21:22:16 +0000[diff] [blame]1037lists</a>.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1038
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1039</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1040
1041<!-- *********************************************************************** -->
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1042
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1043<hr>
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]1044<address>
Misha Brukman38847d52003-12-21 22:53:21 +0000[diff] [blame]1045 <a href="http://jigsaw.w3.org/css-validator/check/referer"><img
Misha Brukman44408702008-12-11 17:34:48 +0000[diff] [blame]1046 src="http://jigsaw.w3.org/css-validator/images/vcss-blue" alt="Valid CSS"></a>
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]1047 <a href="http://validator.w3.org/check/referer"><img
Misha Brukman44408702008-12-11 17:34:48 +0000[diff] [blame]1048 src="http://www.w3.org/Icons/valid-html401-blue" alt="Valid HTML 4.01"></a>
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]1049
Chris Lattnerb4b0ce72007-05-18 00:44:29 +0000[diff] [blame]1050 <a href="http://llvm.org/">LLVM Compiler Infrastructure</a><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1051 Last modified: $Date$
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]1052</address>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1053
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