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gerrit-public.fairphone.software / platform / external / llvm / 1071dbb09d33fa9c739a4313f2edbef7796b385e / . / docs / ReleaseNotes.html
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Dan Gohmanf17a25c2007-07-18 16:29:46 +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>
5 <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
6 <link rel="stylesheet" href="llvm.css" type="text/css">
Jeffrey Yasskin8ee1b0a2010-01-28 01:14:43 +0000[diff] [blame]7 <title>LLVM 2.7 Release Notes</title>
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]8</head>
9<body>
10
Jeffrey Yasskin8ee1b0a2010-01-28 01:14:43 +0000[diff] [blame]11<div class="doc_title">LLVM 2.7 Release Notes</div>
Mikhail Glushenkov808cd3e2008-10-13 02:08:34 +0000[diff] [blame]12
Chris Lattnere5236102010-03-17 04:02:39 +0000[diff] [blame]13<img align=right src="http://llvm.org/img/DragonSmall.png"
14 width="136" height="136">
15
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]16<ol>
17 <li><a href="#intro">Introduction</a></li>
Chris Lattner78a130b2008-10-13 18:01:01 +0000[diff] [blame]18 <li><a href="#subproj">Sub-project Status Update</a></li>
Jeffrey Yasskin8ee1b0a2010-01-28 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>
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]21 <li><a href="GettingStarted.html">Installation Instructions</a></li>
22 <li><a href="#portability">Portability and Supported Platforms</a></li>
Dan Gohman0de549c2008-10-14 16:23:02 +0000[diff] [blame]23 <li><a href="#knownproblems">Known Problems</a></li>
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]24 <li><a href="#additionalinfo">Additional Information</a></li>
25</ol>
26
27<div class="doc_author">
Dan Gohman0de549c2008-10-14 16:23:02 +0000[diff] [blame]28 <p>Written by the <a href="http://llvm.org">LLVM Team</a></p>
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]29</div>
30
Jeffrey Yasskin8ee1b0a2010-01-28 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
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]37<!-- *********************************************************************** -->
38<div class="doc_section">
39 <a name="intro">Introduction</a>
40</div>
41<!-- *********************************************************************** -->
42
43<div class="doc_text">
44
Chris Lattner92eacf82008-10-13 17:57:36 +0000[diff] [blame]45<p>This document contains the release notes for the LLVM Compiler
Jeffrey Yasskin8ee1b0a2010-01-28 01:14:43 +0000[diff] [blame]46Infrastructure, release 2.7. Here we describe the status of LLVM, including
Chris Lattner92eacf82008-10-13 17:57:36 +0000[diff] [blame]47major improvements from the previous release and significant known problems.
Mikhail Glushenkovf61066a2009-03-01 18:09:47 +0000[diff] [blame]48All LLVM releases may be downloaded from the <a
Chris Lattner92eacf82008-10-13 17:57:36 +0000[diff] [blame]49href="http://llvm.org/releases/">LLVM releases web site</a>.</p>
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]50
51<p>For more information about LLVM, including information about the latest
52release, please check out the <a href="http://llvm.org/">main LLVM
53web site</a>. If you have questions or comments, the <a
Chris Lattner58b1d0f2010-03-17 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>
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]56
Mikhail Glushenkov808cd3e2008-10-13 02:08:34 +0000[diff] [blame]57<p>Note that if you are reading this file from a Subversion checkout or the
Chris Lattnerb0d6c502007-09-21 03:54:09 +0000[diff] [blame]58main LLVM web page, this document applies to the <i>next</i> release, not the
Gabor Greif7c65c4f2008-10-14 11:00:32 +0000[diff] [blame]59current one. To see the release notes for a specific release, please see the
Chris Lattnerb0d6c502007-09-21 03:54:09 +0000[diff] [blame]60<a href="http://llvm.org/releases/">releases page</a>.</p>
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]61
Chris Lattner58b1d0f2010-03-17 04:41:49 +0000[diff] [blame]62
Chris Lattner2b656342010-03-17 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 Lattner58b1d0f2010-03-17 04:41:49 +0000[diff] [blame]65
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]66</div>
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]67
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]68
Chris Lattner0b6ea7a2009-10-13 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 Lattner35da3812010-01-09 22:30:40 +0000[diff] [blame]74 ABCD, SCCVN, GEPSplitterPass
Chris Lattner2bd5e652010-01-16 21:25:13 +0000[diff] [blame]75 MSIL backend?
Chris Lattner2b656342010-03-17 06:41:58 +0000[diff] [blame]76 lib/Transforms/Utils/SSI.cpp -> ABCD depends on it.
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]77-->
78
79
Jeffrey Yasskin8ee1b0a2010-01-28 01:14:43 +0000[diff] [blame]80<!-- Features that need text if they're finished for 2.7:
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]81 gcc plugin.
82 strong phi elim
83 variable debug info for optimized code
Chris Lattnerb2cc5022009-02-26 22:33:38 +0000[diff] [blame]84 postalloc scheduler: anti dependence breaking, hazard recognizer?
Chris Lattner0b6ea7a2009-10-13 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 Lattner8fda4952008-02-10 07:46:44 +0000[diff] [blame]89 -->
Mikhail Glushenkov808cd3e2008-10-13 02:08:34 +0000[diff] [blame]90
Chris Lattner4f076402008-10-12 19:47:48 +0000[diff] [blame]91 <!-- for announcement email:
Chris Lattner0b6ea7a2009-10-13 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 Lattner2b656342010-03-17 06:41:58 +0000[diff] [blame]97 Mention gcc plugin.
Chris Lattnera53f4972009-02-25 06:34:50 +0000[diff] [blame]98 -->
Chris Lattner8fda4952008-02-10 07:46:44 +0000[diff] [blame]99
Chris Lattner78a130b2008-10-13 18:01:01 +0000[diff] [blame]100<!-- *********************************************************************** -->
101<div class="doc_section">
102 <a name="subproj">Sub-project Status Update</a>
Chris Lattnerf65224f2008-06-08 21:34:41 +0000[diff] [blame]103</div>
Chris Lattner78a130b2008-10-13 18:01:01 +0000[diff] [blame]104<!-- *********************************************************************** -->
Chris Lattnerf65224f2008-06-08 21:34:41 +0000[diff] [blame]105
106<div class="doc_text">
Chris Lattnerf6a0d382008-06-08 21:58:17 +0000[diff] [blame]107<p>
Jeffrey Yasskin8ee1b0a2010-01-28 01:14:43 +0000[diff] [blame]108The LLVM 2.7 distribution currently consists of code from the core LLVM
Chris Lattner0b6ea7a2009-10-13 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 Wendlingdde41b82009-03-02 04:28:57 +0000[diff] [blame]113</p>
Chris Lattner78a130b2008-10-13 18:01:01 +0000[diff] [blame]114
Chris Lattnerf6a0d382008-06-08 21:58:17 +0000[diff] [blame]115</div>
116
Chris Lattner78a130b2008-10-13 18:01:01 +0000[diff] [blame]117
Chris Lattnerf6a0d382008-06-08 21:58:17 +0000[diff] [blame]118<!--=========================================================================-->
Chris Lattner78a130b2008-10-13 18:01:01 +0000[diff] [blame]119<div class="doc_subsection">
Chris Lattnera3c683b2008-10-13 18:11:54 +0000[diff] [blame]120<a name="clang">Clang: C/C++/Objective-C Frontend Toolkit</a>
Chris Lattnerf6a0d382008-06-08 21:58:17 +0000[diff] [blame]121</div>
122
123<div class="doc_text">
124
Jeffrey Yasskin8ee1b0a2010-01-28 01:14:43 +0000[diff] [blame]125<p>The <a href="http://clang.llvm.org/">Clang project</a> is ...</p>
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]126
Jeffrey Yasskin8ee1b0a2010-01-28 01:14:43 +0000[diff] [blame]127<p>In the LLVM 2.7 time-frame, the Clang team has made many improvements:</p>
Bill Wendling385b0d32008-10-27 09:27:33 +0000[diff] [blame]128
Daniel Dunbarf3e35782008-10-14 23:25:09 +0000[diff] [blame]129<ul>
Daniel Dunbar29f1e722010-03-25 16:09:18 +0000[diff] [blame]130<li>FIXME: C++! Include a link to cxx_compatibility.html</li>
131
132<li>FIXME: Static Analyzer improvements?</li>
133
134<li>CIndex API and Python bindings: Clang now includes a C API as part of the
135CIndex library. Although we make make some changes to the API in the future, it
136is intended to be stable and has been designed for use by external projects. See
137the Clang
138doxygen <a href="http://clang.llvm.org/doxygen/group__CINDEX.html">CIndex</a>
139documentation for more details. The CIndex API also includings an preliminary
140set of Python bindings.</li>
141
142<li>ARM Support: Clang now has ABI support for both the Darwin and Linux ARM
143ABIs. Coupled with many improvements to the LLVM ARM backend, Clang is now
144suitable for use as a a beta quality ARM compiler.</li>
Bill Wendlinga8fb81d2009-03-02 04:28:18 +0000[diff] [blame]145</ul>
Chris Lattnera3c683b2008-10-13 18:11:54 +0000[diff] [blame]146</div>
147
148<!--=========================================================================-->
149<div class="doc_subsection">
150<a name="clangsa">Clang Static Analyzer</a>
151</div>
152
153<div class="doc_text">
154
Jeffrey Yasskin8ee1b0a2010-01-28 01:14:43 +0000[diff] [blame]155<p>Previously announced in the 2.4, 2.5, and 2.6 LLVM releases, the Clang project also
Ted Kremeneka0d77d72009-02-27 07:01:32 +0000[diff] [blame]156includes an early stage static source code analysis tool for <a
157href="http://clang.llvm.org/StaticAnalysis.html">automatically finding bugs</a>
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]158in C and Objective-C programs. The tool performs checks to find
Ted Kremeneka0d77d72009-02-27 07:01:32 +0000[diff] [blame]159bugs that occur on a specific path within a program.</p>
Chris Lattnerc2d84672008-10-14 00:52:49 +0000[diff] [blame]160
Chris Lattnere5236102010-03-17 04:02:39 +0000[diff] [blame]161<p>In the LLVM 2.7 time-frame, the analyzer core has sprouted legs and...</p>
Chris Lattnerf6a0d382008-06-08 21:58:17 +0000[diff] [blame]162
163</div>
164
Chris Lattner78a130b2008-10-13 18:01:01 +0000[diff] [blame]165<!--=========================================================================-->
166<div class="doc_subsection">
Nicolas Geoffray2b139382008-10-14 19:23:04 +0000[diff] [blame]167<a name="vmkit">VMKit: JVM/CLI Virtual Machine Implementation</a>
Chris Lattner78a130b2008-10-13 18:01:01 +0000[diff] [blame]168</div>
169
170<div class="doc_text">
171<p>
Nicolas Geoffray2b139382008-10-14 19:23:04 +0000[diff] [blame]172The <a href="http://vmkit.llvm.org/">VMKit project</a> is an implementation of
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]173a JVM and a CLI Virtual Machine (Microsoft .NET is an
174implementation of the CLI) using LLVM for static and just-in-time
175compilation.</p>
Chris Lattner78a130b2008-10-13 18:01:01 +0000[diff] [blame]176
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]177<p>
Chris Lattnerd5b62522010-03-29 18:34:13 +0000[diff] [blame]178With the release of LLVM 2.7, VMKit has shifted to a great framework for writing
179virtual machines. VMKit now offers precise and efficient garbage collection with
180multi-threading support, thanks to the MMTk memory management toolkit, as well
181as just in time and ahead of time compilation with LLVM. The major changes in
182VMKit 0.27 are:</p>
Chris Lattner78a130b2008-10-13 18:01:01 +0000[diff] [blame]183
Nicolas Geoffray2b139382008-10-14 19:23:04 +0000[diff] [blame]184<ul>
185
Chris Lattnerd5b62522010-03-29 18:34:13 +0000[diff] [blame]186<li>Garbage collection: VMKit now uses the MMTk toolkit for garbage collectors.
187 The first collector to be ported is the MarkSweep collector, which is precise,
188 and drastically improves the performance of VMKit.</li>
189<li>Line number information in the JVM: by using the debug metadata of LLVM, the
190 JVM now supports precise line number information, useful when printing a stack
191 trace.</li>
192<li>Interface calls in the JVM: we implemented a variant of the Interface Method
193 Table technique for interface calls in the JVM.
194</li>
Nicolas Geoffray2b139382008-10-14 19:23:04 +0000[diff] [blame]195
196</ul>
Chris Lattner78a130b2008-10-13 18:01:01 +0000[diff] [blame]197</div>
198
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]199
200<!--=========================================================================-->
201<div class="doc_subsection">
202<a name="compiler-rt">compiler-rt: Compiler Runtime Library</a>
203</div>
204
205<div class="doc_text">
206<p>
207The new LLVM <a href="http://compiler-rt.llvm.org/">compiler-rt project</a>
208is a simple library that provides an implementation of the low-level
209target-specific hooks required by code generation and other runtime components.
210For example, when compiling for a 32-bit target, converting a double to a 64-bit
211unsigned integer is compiled into a runtime call to the "__fixunsdfdi"
212function. The compiler-rt library provides highly optimized implementations of
213this and other low-level routines (some are 3x faster than the equivalent
214libgcc routines).</p>
215
216<p>
217All of the code in the compiler-rt project is available under the standard LLVM
218License, a "BSD-style" license.</p>
219
220</div>
221
222<!--=========================================================================-->
223<div class="doc_subsection">
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]224<a name="dragonegg">DragonEgg: GCC-4.5 as an LLVM frontend</a>
225</div>
226
227<div class="doc_text">
228<p>
229The goal of <a href="http://dragonegg.llvm.org/">DragonEgg</a> is to make
230gcc-4.5 act like llvm-gcc without requiring any gcc modifications whatsoever.
Duncan Sandsf6fb7142009-10-15 08:17:44 +0000[diff] [blame]231<a href="http://dragonegg.llvm.org/">DragonEgg</a> is a shared library (dragonegg.so)
Jeffrey Yasskin8ee1b0a2010-01-28 01:14:43 +0000[diff] [blame]232that is loaded by gcc at runtime. It ...
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]233</p>
234
235</div>
236
237
238<!--=========================================================================-->
239<div class="doc_subsection">
240<a name="mc">llvm-mc: Machine Code Toolkit</a>
241</div>
242
243<div class="doc_text">
244<p>
Jeffrey Yasskin8ee1b0a2010-01-28 01:14:43 +0000[diff] [blame]245The LLVM Machine Code (MC) Toolkit project is ...
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]246</p>
247
248</div>
249
250
Chris Lattnerb2cc5022009-02-26 22:33:38 +0000[diff] [blame]251<!-- *********************************************************************** -->
252<div class="doc_section">
Jeffrey Yasskin8ee1b0a2010-01-28 01:14:43 +0000[diff] [blame]253 <a name="externalproj">External Open Source Projects Using LLVM 2.7</a>
Chris Lattnerb2cc5022009-02-26 22:33:38 +0000[diff] [blame]254</div>
255<!-- *********************************************************************** -->
256
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]257<div class="doc_text">
258
259<p>An exciting aspect of LLVM is that it is used as an enabling technology for
260 a lot of other language and tools projects. This section lists some of the
Jeffrey Yasskin8ee1b0a2010-01-28 01:14:43 +0000[diff] [blame]261 projects that have already been updated to work with LLVM 2.7.</p>
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]262</div>
263
264
265<!--=========================================================================-->
266<div class="doc_subsection">
267<a name="Rubinius">Rubinius</a>
268</div>
269
270<div class="doc_text">
Chris Lattnere5236102010-03-17 04:02:39 +0000[diff] [blame]271Need update.
272<!--
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]273<p><a href="http://github.com/evanphx/rubinius">Rubinius</a> is an environment
274for running Ruby code which strives to write as much of the core class
275implementation in Ruby as possible. Combined with a bytecode interpreting VM, it
276uses LLVM to optimize and compile ruby code down to machine code. Techniques
277such as type feedback, method inlining, and uncommon traps are all used to
278remove dynamism from ruby execution and increase performance.</p>
279
280<p>Since LLVM 2.5, Rubinius has made several major leaps forward, implementing
281a counter based JIT, type feedback and speculative method inlining.
Chris Lattnere5236102010-03-17 04:02:39 +0000[diff] [blame]282-->
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]283</p>
284
285</div>
286
287<!--=========================================================================-->
288<div class="doc_subsection">
289<a name="macruby">MacRuby</a>
290</div>
291
292<div class="doc_text">
293
294<p>
Chris Lattnere5236102010-03-17 04:02:39 +0000[diff] [blame]295Need update.
296<!--
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]297<a href="http://macruby.org">MacRuby</a> is an implementation of Ruby on top of
298core Mac OS X technologies, such as the Objective-C common runtime and garbage
299collector and the CoreFoundation framework. It is principally developed by
300Apple and aims at enabling the creation of full-fledged Mac OS X applications.
301</p>
302
303<p>
304MacRuby uses LLVM for optimization passes, JIT and AOT compilation of Ruby
305expressions. It also uses zero-cost DWARF exceptions to implement Ruby exception
Chris Lattnere5236102010-03-17 04:02:39 +0000[diff] [blame]306handling.--> </p>
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]307
308</div>
309
310
Chris Lattnerb2cc5022009-02-26 22:33:38 +0000[diff] [blame]311<!--=========================================================================-->
312<div class="doc_subsection">
313<a name="pure">Pure</a>
314</div>
315
316<div class="doc_text">
317<p>
Chris Lattner47202c32009-03-02 02:37:32 +0000[diff] [blame]318<a href="http://pure-lang.googlecode.com/">Pure</a>
319is an algebraic/functional programming language based on term rewriting.
Chris Lattnerb2cc5022009-02-26 22:33:38 +0000[diff] [blame]320Programs are collections of equations which are used to evaluate expressions in
321a symbolic fashion. Pure offers dynamic typing, eager and lazy evaluation,
Mikhail Glushenkovf61066a2009-03-01 18:09:47 +0000[diff] [blame]322lexical closures, a hygienic macro system (also based on term rewriting),
Chris Lattnerb2cc5022009-02-26 22:33:38 +0000[diff] [blame]323built-in list and matrix support (including list and matrix comprehensions) and
324an easy-to-use C interface. The interpreter uses LLVM as a backend to
325 JIT-compile Pure programs to fast native code.</p>
326
Chris Lattner1f8dc512010-03-17 17:25:49 +0000[diff] [blame]327<p>Pure versions 0.43 and later have been tested and are known to work with
328LLVM 2.7 (and continue to work with older LLVM releases >= 2.5).</p>
329
Chris Lattnerb2cc5022009-02-26 22:33:38 +0000[diff] [blame]330</div>
331
332
333<!--=========================================================================-->
334<div class="doc_subsection">
335<a name="ldc">LLVM D Compiler</a>
336</div>
337
338<div class="doc_text">
339<p>
Chris Lattnere5236102010-03-17 04:02:39 +0000[diff] [blame]340Need update.
341<!--
Chris Lattner47202c32009-03-02 02:37:32 +0000[diff] [blame]342<a href="http://www.dsource.org/projects/ldc">LDC</a> is an implementation of
343the D Programming Language using the LLVM optimizer and code generator.
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]344The LDC project works great with the LLVM 2.6 release. General improvements in
John Criswellaea8c752009-03-02 15:28:15 +0000[diff] [blame]345this
Chris Lattner47202c32009-03-02 02:37:32 +0000[diff] [blame]346cycle have included new inline asm constraint handling, better debug info
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]347support, general bug fixes and better x86-64 support. This has allowed
348some major improvements in LDC, getting it much closer to being as
Chris Lattnere5236102010-03-17 04:02:39 +0000[diff] [blame]349fully featured as the original DMD compiler from DigitalMars.-->
Chris Lattnerb2cc5022009-02-26 22:33:38 +0000[diff] [blame]350</p>
351</div>
352
Chris Lattner1ad599a2009-02-28 18:58:01 +0000[diff] [blame]353<!--=========================================================================-->
354<div class="doc_subsection">
355<a name="RoadsendPHP">Roadsend PHP</a>
356</div>
357
358<div class="doc_text">
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]359<p>
360<a href="http://code.roadsend.com/rphp">Roadsend PHP</a> (rphp) is an open
Chris Lattner9e08de12009-03-02 19:07:24 +0000[diff] [blame]361source implementation of the PHP programming
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]362language that uses LLVM for its optimizer, JIT and static compiler. This is a
Chris Lattnere5236102010-03-17 04:02:39 +0000[diff] [blame]363reimplementation of an earlier project that is now based on LLVM.
Chris Lattner1f8dc512010-03-17 17:25:49 +0000[diff] [blame]364</p>
Chris Lattner1ad599a2009-02-28 18:58:01 +0000[diff] [blame]365</div>
Chris Lattnerb2cc5022009-02-26 22:33:38 +0000[diff] [blame]366
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]367<!--=========================================================================-->
368<div class="doc_subsection">
369<a name="UnladenSwallow">Unladen Swallow</a>
370</div>
371
372<div class="doc_text">
373<p>
374<a href="http://code.google.com/p/unladen-swallow/">Unladen Swallow</a> is a
375branch of <a href="http://python.org/">Python</a> intended to be fully
376compatible and significantly faster. It uses LLVM's optimization passes and JIT
Chris Lattnerd7db82c2010-03-18 06:52:15 +0000[diff] [blame]377compiler.
Chris Lattnere5236102010-03-17 04:02:39 +0000[diff] [blame]378</p>
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]379</div>
380
381<!--=========================================================================-->
382<div class="doc_subsection">
383<a name="llvm-lua">llvm-lua</a>
384</div>
385
386<div class="doc_text">
387<p>
Chris Lattnere5236102010-03-17 04:02:39 +0000[diff] [blame]388Need update.
389<!--
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]390<a href="http://code.google.com/p/llvm-lua/">LLVM-Lua</a> uses LLVM to add JIT
391and static compiling support to the Lua VM. Lua bytecode is analyzed to
392remove type checks, then LLVM is used to compile the bytecode down to machine
Chris Lattnere5236102010-03-17 04:02:39 +0000[diff] [blame]393code.-->
394</p>
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]395</div>
396
397<!--=========================================================================-->
398<div class="doc_subsection">
399<a name="icedtea">IcedTea Java Virtual Machine Implementation</a>
400</div>
401
402<div class="doc_text">
403<p>
Chris Lattnere5236102010-03-17 04:02:39 +0000[diff] [blame]404Need update.
405<!--
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]406<a href="http://icedtea.classpath.org/wiki/Main_Page">IcedTea</a> provides a
407harness to build OpenJDK using only free software build tools and to provide
408replacements for the not-yet free parts of OpenJDK. One of the extensions that
409IcedTea provides is a new JIT compiler named <a
410href="http://icedtea.classpath.org/wiki/ZeroSharkFaq">Shark</a> which uses LLVM
411to provide native code generation without introducing processor-dependent
Chris Lattnere5236102010-03-17 04:02:39 +0000[diff] [blame]412code.-->
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]413</p>
414</div>
415
416
Chris Lattner49894862010-03-29 17:50:39 +0000[diff] [blame]417<!--=========================================================================-->
418<div class="doc_subsection">
419<a name="tce">TTA-based Codesign Environment (TCE)</a>
420</div>
421
422<div class="doc_text">
423<p>
424<a href="http://tce.cs.tut.fi/">TCE</a> is a toolset for designing
425application-specific processors (ASP) based on the Transport triggered
426architecture (TTA). The toolset provides a complete co-design flow from C/C++
427programs down to synthesizable VHDL and parallel program binaries. Processor
428customization points include the register files, function units, supported
429operations, and the interconnection network.</p>
430
431<p>TCE uses llvm-gcc/Clang and LLVM for C/C++ language support, target
432independent optimizations and also for parts of code generation. It generates
433new LLVM-based code generators "on the fly" for the designed TTA processors and
434loads them in to the compiler backend as runtime libraries to avoid per-target
435recompilation of larger parts of the compiler chain.</p>
436
437</div>
Chris Lattnerf6a0d382008-06-08 21:58:17 +0000[diff] [blame]438
439<!-- *********************************************************************** -->
440<div class="doc_section">
Jeffrey Yasskin8ee1b0a2010-01-28 01:14:43 +0000[diff] [blame]441 <a name="whatsnew">What's New in LLVM 2.7?</a>
Chris Lattnerf6a0d382008-06-08 21:58:17 +0000[diff] [blame]442</div>
443<!-- *********************************************************************** -->
444
Chris Lattner5cce7a52008-06-08 22:59:35 +0000[diff] [blame]445<div class="doc_text">
446
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]447<p>This release includes a huge number of bug fixes, performance tweaks and
Chris Lattner92eacf82008-10-13 17:57:36 +0000[diff] [blame]448minor improvements. Some of the major improvements and new features are listed
449in this section.
Chris Lattner5cce7a52008-06-08 22:59:35 +0000[diff] [blame]450</p>
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]451
Chris Lattner5cce7a52008-06-08 22:59:35 +0000[diff] [blame]452</div>
453
Chris Lattnerf6a0d382008-06-08 21:58:17 +0000[diff] [blame]454<!--=========================================================================-->
Chris Lattnerf65224f2008-06-08 21:34:41 +0000[diff] [blame]455<div class="doc_subsection">
Chris Lattnere0798082008-02-06 18:00:06 +0000[diff] [blame]456<a name="majorfeatures">Major New Features</a>
457</div>
458
459<div class="doc_text">
460
Jeffrey Yasskin8ee1b0a2010-01-28 01:14:43 +0000[diff] [blame]461<p>LLVM 2.7 includes several major new capabilities:</p>
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]462
463<ul>
Jeffrey Yasskin8ee1b0a2010-01-28 01:14:43 +0000[diff] [blame]464<li>...</li>
Chris Lattner5ba16862008-02-10 08:18:42 +0000[diff] [blame]465</ul>
466
Chris Lattner58b1d0f2010-03-17 04:41:49 +0000[diff] [blame]467Extensible metadata solid.
468
469Debug info improvements: using metadata instead of llvm.dbg global variables.
470This brings several enhancements including improved compile times.
471
472New instruction selector.
473GHC Haskell ABI/ calling conv support.
474Pre-Alpha support for unions in IR.
475New InlineHint and StackAlignment function attributes
476Code generator MC'ized except for debug info and EH.
477New SCEV AA pass: -scev-aa
478Inliner reuses arrays allocas when inlining multiple callers to reduce stack usage.
479MC encoding and disassembler apis.
480Optimal Edge Profiling?
481Instcombine is now a library, has its own IRBuilder to simplify itself.
482New llvm/Support/Regex.h API. FileCheck now does regex's
Chris Lattner2b656342010-03-17 06:41:58 +0000[diff] [blame]483Many subtle pointer invalidation bugs in Callgraph have been fixed and it now uses asserting value handles.
484MC Disassembler (with blog post), MCInstPrinter. Many X86 backend and AsmPrinter simplifications
485Various tools like llc and opt now read either .ll or .bc files as input.
486Malloc and free instructions got removed.
487compiler-rt support for ARM.
488completely llvm-gcc NEON support.
489Can transcode from GAS to intel syntax with "llvm-mc foo.s -output-asm-variant=1"
490JIT debug information with GDB 7.0
Chris Lattner27b5bd52010-03-17 18:15:52 +0000[diff] [blame]491New CodeGen Level CSE
Chris Lattner2b656342010-03-17 06:41:58 +0000[diff] [blame]492CMake can now run tests, what other improvements?
Chris Lattner27b5bd52010-03-17 18:15:52 +0000[diff] [blame]493ARM/Thumb using reg scavenging for stack object address materialization (PEI).
Chris Lattner2b656342010-03-17 06:41:58 +0000[diff] [blame]494New SSAUpdater and MachineSSAUpdater classes for unstructured ssa updating,
495 changed jump threading, GVN, etc to use it which simplified them and speed
496 them up.
Chris Lattner99bfacb2010-03-17 06:42:25 +0000[diff] [blame]497Combiner-AA improvements, why not on by default?
Chris Lattner27b5bd52010-03-17 18:15:52 +0000[diff] [blame]498Pre-regalloc tail duplication
499x86 sibcall optimization
500New LSR with full strength reduction mode
501The most awesome sext / zext optimization pass. ?
502
Chris Lattner1071dbb2010-03-29 18:39:28 +0000[diff] [blame^]503The ARM backend now has good support for ARMv4 backend (tested on StrongARM
504 hardware), previously only supported ARMv4T and newer.
505
Chris Lattner27b5bd52010-03-17 18:15:52 +0000[diff] [blame]506
Chris Lattner58b1d0f2010-03-17 04:41:49 +0000[diff] [blame]507
Chris Lattner2b656342010-03-17 06:41:58 +0000[diff] [blame]508CondProp pass removed (functionality merged into jump threading).
Chris Lattner58b1d0f2010-03-17 04:41:49 +0000[diff] [blame]509AndersAA got removed (from 2.7 or mainline?)
Chris Lattner2b656342010-03-17 06:41:58 +0000[diff] [blame]510PredSimplify, LoopVR, GVNPRE got removed.
Chris Lattner58b1d0f2010-03-17 04:41:49 +0000[diff] [blame]511LLVM command line tools now overwrite their output, before they would only do this with -f.
512DOUT removed, use DEBUG(errs() instead.
513Much stuff converted to use raw_ostream instead of std::ostream.
514TargetAsmInfo renamed to MCAsmInfo
515llvm/ADT/iterator.h gone.
516
Chris Lattner2b656342010-03-17 06:41:58 +0000[diff] [blame]517
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]518</div>
519
Chris Lattnerb0d6c502007-09-21 03:54:09 +0000[diff] [blame]520<!--=========================================================================-->
521<div class="doc_subsection">
Chris Lattner47202c32009-03-02 02:37:32 +0000[diff] [blame]522<a name="coreimprovements">LLVM IR and Core Improvements</a>
Chris Lattnerc3649452008-02-10 08:17:19 +0000[diff] [blame]523</div>
524
525<div class="doc_text">
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]526<p>LLVM IR has several new features for better support of new targets and that
527expose new optimization opportunities:</p>
Chris Lattnerc3649452008-02-10 08:17:19 +0000[diff] [blame]528
Chris Lattnerc5a4e312008-06-05 06:25:56 +0000[diff] [blame]529<ul>
Jeffrey Yasskin8ee1b0a2010-01-28 01:14:43 +0000[diff] [blame]530<li>...</li>
Chris Lattnerc3649452008-02-10 08:17:19 +0000[diff] [blame]531</ul>
Mikhail Glushenkov808cd3e2008-10-13 02:08:34 +0000[diff] [blame]532
Chris Lattnerc3649452008-02-10 08:17:19 +0000[diff] [blame]533</div>
534
535<!--=========================================================================-->
536<div class="doc_subsection">
Chris Lattner8fda4952008-02-10 07:46:44 +0000[diff] [blame]537<a name="optimizer">Optimizer Improvements</a>
538</div>
539
540<div class="doc_text">
541
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]542<p>In addition to a large array of minor performance tweaks and bug fixes, this
Chris Lattnerea9c2242008-10-13 21:50:36 +0000[diff] [blame]543release includes a few major enhancements and additions to the optimizers:</p>
Chris Lattner8fda4952008-02-10 07:46:44 +0000[diff] [blame]544
545<ul>
546
Jeffrey Yasskin8ee1b0a2010-01-28 01:14:43 +0000[diff] [blame]547<li>...</li>
Chris Lattner47202c32009-03-02 02:37:32 +0000[diff] [blame]548
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]549</ul>
Chris Lattner47202c32009-03-02 02:37:32 +0000[diff] [blame]550
Chris Lattner317685c2010-03-01 19:29:17 +0000[diff] [blame]551<p>Also, -anders-aa was removed</p>
552
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]553</div>
Chris Lattner47202c32009-03-02 02:37:32 +0000[diff] [blame]554
Chris Lattner47202c32009-03-02 02:37:32 +0000[diff] [blame]555
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]556<!--=========================================================================-->
557<div class="doc_subsection">
558<a name="executionengine">Interpreter and JIT Improvements</a>
559</div>
Chris Lattnerea9c2242008-10-13 21:50:36 +0000[diff] [blame]560
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]561<div class="doc_text">
562
563<ul>
Jeffrey Yasskin40715142010-01-29 19:10:38 +0000[diff] [blame]564<li>The JIT now <a
565href="http://llvm.org/viewvc/llvm-project?view=rev&revision=85295">defaults
566to compiling eagerly</a> to avoid a race condition in the lazy JIT.
567Clients that still want the lazy JIT can switch it on by calling
568<tt>ExecutionEngine::DisableLazyCompilation(false)</tt>.</li>
Jeffrey Yasskinc0577082010-02-11 01:07:39 +0000[diff] [blame]569<li>It is now possible to create more than one JIT instance in the same process.
570These JITs can generate machine code in parallel,
571although <a href="http://llvm.org/docs/ProgrammersManual.html#jitthreading">you
572still have to obey the other threading restrictions</a>.</li>
Chris Lattner0eef6e42008-06-08 02:45:07 +0000[diff] [blame]573</ul>
574
575</div>
576
577<!--=========================================================================-->
578<div class="doc_subsection">
Chris Lattner5f393542009-03-02 03:24:11 +0000[diff] [blame]579<a name="codegen">Target Independent Code Generator Improvements</a>
Chris Lattner0eef6e42008-06-08 02:45:07 +0000[diff] [blame]580</div>
581
582<div class="doc_text">
583
Mikhail Glushenkovf61066a2009-03-01 18:09:47 +0000[diff] [blame]584<p>We have put a significant amount of work into the code generator
585infrastructure, which allows us to implement more aggressive algorithms and make
586it run faster:</p>
Chris Lattner0eef6e42008-06-08 02:45:07 +0000[diff] [blame]587
588<ul>
Chris Lattner5f393542009-03-02 03:24:11 +0000[diff] [blame]589
Jeffrey Yasskin8ee1b0a2010-01-28 01:14:43 +0000[diff] [blame]590<li>...</li>
Chris Lattnerb0d6c502007-09-21 03:54:09 +0000[diff] [blame]591</ul>
Chris Lattnerb0d6c502007-09-21 03:54:09 +0000[diff] [blame]592</div>
593
Chris Lattner47202c32009-03-02 02:37:32 +0000[diff] [blame]594<!--=========================================================================-->
595<div class="doc_subsection">
596<a name="x86">X86-32 and X86-64 Target Improvements</a>
597</div>
598
599<div class="doc_text">
600<p>New features of the X86 target include:
601</p>
602
603<ul>
Chris Lattner5f393542009-03-02 03:24:11 +0000[diff] [blame]604
Jeffrey Yasskin8ee1b0a2010-01-28 01:14:43 +0000[diff] [blame]605<li>...</li>
Chris Lattner5f393542009-03-02 03:24:11 +0000[diff] [blame]606
Chris Lattner47202c32009-03-02 02:37:32 +0000[diff] [blame]607</ul>
608
Chris Lattner47202c32009-03-02 02:37:32 +0000[diff] [blame]609</div>
Chris Lattnerb0d6c502007-09-21 03:54:09 +0000[diff] [blame]610
611<!--=========================================================================-->
612<div class="doc_subsection">
Chris Lattnere1fbd752009-02-26 07:32:11 +0000[diff] [blame]613<a name="pic16">PIC16 Target Improvements</a>
614</div>
615
616<div class="doc_text">
617<p>New features of the PIC16 target include:
618</p>
619
620<ul>
Jeffrey Yasskin8ee1b0a2010-01-28 01:14:43 +0000[diff] [blame]621<li>...</li>
Chris Lattnere1fbd752009-02-26 07:32:11 +0000[diff] [blame]622</ul>
623
624<p>Things not yet supported:</p>
625
626<ul>
Chris Lattnere1fbd752009-02-26 07:32:11 +0000[diff] [blame]627<li>Variable arguments.</li>
Chris Lattner5f393542009-03-02 03:24:11 +0000[diff] [blame]628<li>Interrupts/programs.</li>
Chris Lattnere1fbd752009-02-26 07:32:11 +0000[diff] [blame]629</ul>
630
631</div>
632
Chris Lattnere1fbd752009-02-26 07:32:11 +0000[diff] [blame]633<!--=========================================================================-->
634<div class="doc_subsection">
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]635<a name="ARM">ARM Target Improvements</a>
Chris Lattner7ccc40d2009-03-01 02:30:21 +0000[diff] [blame]636</div>
637
638<div class="doc_text">
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]639<p>New features of the ARM target include:
640</p>
Chris Lattner7ccc40d2009-03-01 02:30:21 +0000[diff] [blame]641
642<ul>
Chris Lattner7ccc40d2009-03-01 02:30:21 +0000[diff] [blame]643
Jeffrey Yasskin8ee1b0a2010-01-28 01:14:43 +0000[diff] [blame]644<li>...</li>
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]645</ul>
Chris Lattner7ccc40d2009-03-01 02:30:21 +0000[diff] [blame]646
Chris Lattner7ccc40d2009-03-01 02:30:21 +0000[diff] [blame]647
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]648</div>
Chris Lattner7ccc40d2009-03-01 02:30:21 +0000[diff] [blame]649
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]650<!--=========================================================================-->
651<div class="doc_subsection">
652<a name="OtherTarget">Other Target Specific Improvements</a>
653</div>
Chris Lattner7ccc40d2009-03-01 02:30:21 +0000[diff] [blame]654
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]655<div class="doc_text">
656<p>New features of other targets include:
657</p>
658
659<ul>
Jeffrey Yasskin8ee1b0a2010-01-28 01:14:43 +0000[diff] [blame]660<li>...</li>
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]661</ul>
662
663</div>
664
665<!--=========================================================================-->
666<div class="doc_subsection">
667<a name="newapis">New Useful APIs</a>
668</div>
669
670<div class="doc_text">
671
672<p>This release includes a number of new APIs that are used internally, which
673 may also be useful for external clients.
674</p>
675
676<ul>
Jeffrey Yasskin8ee1b0a2010-01-28 01:14:43 +0000[diff] [blame]677<li>...</li>
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]678</ul>
679
680
681</div>
682
683<!--=========================================================================-->
684<div class="doc_subsection">
685<a name="otherimprovements">Other Improvements and New Features</a>
686</div>
687
688<div class="doc_text">
689<p>Other miscellaneous features include:</p>
690
691<ul>
Jeffrey Yasskin8ee1b0a2010-01-28 01:14:43 +0000[diff] [blame]692<li>...</li>
Chris Lattner7ccc40d2009-03-01 02:30:21 +0000[diff] [blame]693</ul>
694
695</div>
696
Chris Lattnere45f18b2008-06-05 08:02:49 +0000[diff] [blame]697
698<!--=========================================================================-->
699<div class="doc_subsection">
Chris Lattner92eacf82008-10-13 17:57:36 +0000[diff] [blame]700<a name="changes">Major Changes and Removed Features</a>
701</div>
702
703<div class="doc_text">
704
Chris Lattnercc64a322008-10-13 22:06:31 +0000[diff] [blame]705<p>If you're already an LLVM user or developer with out-of-tree changes based
Jeffrey Yasskin8ee1b0a2010-01-28 01:14:43 +0000[diff] [blame]706on LLVM 2.6, this section lists some "gotchas" that you may run into upgrading
Chris Lattnercc64a322008-10-13 22:06:31 +0000[diff] [blame]707from the previous release.</p>
Chris Lattner92eacf82008-10-13 17:57:36 +0000[diff] [blame]708
709<ul>
Jeffrey Yasskin260af332010-02-09 23:03:44 +0000[diff] [blame]710<li>The LLVM interpreter now defaults to <em>not</em> using <tt>libffi</tt> even
711if you have it installed. This makes it more likely that an LLVM built on one
712system will work when copied to a similar system. To use <tt>libffi</tt>,
713configure with <tt>--enable-libffi</tt>.
714</li>
Chris Lattnercc64a322008-10-13 22:06:31 +0000[diff] [blame]715</ul>
716
717
718<p>In addition, many APIs have changed in this release. Some of the major LLVM
719API changes are:</p>
720
721<ul>
Jeffrey Yasskin2ca16212010-01-28 01:41:20 +0000[diff] [blame]722<li><tt>ModuleProvider</tt> has been <a
723href="http://llvm.org/viewvc/llvm-project?view=rev&revision=94686">removed</a>
724and its methods moved to <tt>Module</tt> and <tt>GlobalValue</tt>.
725Most clients can remove uses of <tt>ExistingModuleProvider</tt>,
726replace <tt>getBitcodeModuleProvider</tt> with
727<tt>getLazyBitcodeModule</tt>, and pass their <tt>Module</tt> to
728functions that used to accept <tt>ModuleProvider</tt>. Clients who
729wrote their own <tt>ModuleProvider</tt>s will need to derive from
730<tt>GVMaterializer</tt> instead and use
731<tt>Module::setMaterializer</tt> to attach it to a
732<tt>Module</tt>.</li>
733
734<li><tt>GhostLinkage</tt> has given up the ghost.
735<tt>GlobalValue</tt>s that have not yet been read from their backing
736storage have the same linkage they will have after being read in.
737Clients must replace calls to
738<tt>GlobalValue::hasNotBeenReadFromBitcode</tt> with
739<tt>GlobalValue::isMaterializable</tt>.</li>
Daniel Dunbar61f41422010-02-10 04:09:52 +0000[diff] [blame]740
741<li>FIXME: Debug info has been totally redone. Add pointers to new APIs. Substantial caveats about compatibility of .ll and .bc files.</li>
742
Daniel Dunbar369889a2010-02-14 01:47:19 +0000[diff] [blame]743<li>The <tt>llvm/Support/DataTypes.h</tt> header has moved
744to <tt>llvm/System/DataTypes.h</tt>.</li>
745
Duncan Sandsdd29fc82010-02-17 17:20:17 +0000[diff] [blame]746<li>The <tt>isInteger</tt>, <tt>isIntOrIntVector</tt>, <tt>isFloatingPoint</tt>,
747<tt>isFPOrFPVector</tt> and <tt>isFPOrFPVector</tt> methods have been renamed
748<tt>isIntegerTy</tt>, <tt>isIntOrIntVectorTy</tt>, <tt>isFloatingPointTy</tt>,
749<tt>isFPOrFPVectorTy</tt> and <tt>isFPOrFPVectorTy</tt> respectively.</li>
Devang Patel0e3da1a2008-10-14 20:03:43 +0000[diff] [blame]750</ul>
Chris Lattner92eacf82008-10-13 17:57:36 +0000[diff] [blame]751
Chris Lattner92eacf82008-10-13 17:57:36 +0000[diff] [blame]752</div>
753
754
755
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]756<!-- *********************************************************************** -->
757<div class="doc_section">
758 <a name="portability">Portability and Supported Platforms</a>
759</div>
760<!-- *********************************************************************** -->
761
762<div class="doc_text">
763
764<p>LLVM is known to work on the following platforms:</p>
765
766<ul>
Mikhail Glushenkovf61066a2009-03-01 18:09:47 +0000[diff] [blame]767<li>Intel and AMD machines (IA32, X86-64, AMD64, EMT-64) running Red Hat
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]768 Linux, Fedora Core, FreeBSD and AuroraUX (and probably other unix-like
769 systems).</li>
Mikhail Glushenkovf61066a2009-03-01 18:09:47 +0000[diff] [blame]770<li>PowerPC and X86-based Mac OS X systems, running 10.3 and above in 32-bit
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]771 and 64-bit modes.</li>
Chris Lattnere0798082008-02-06 18:00:06 +0000[diff] [blame]772<li>Intel and AMD machines running on Win32 using MinGW libraries (native).</li>
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]773<li>Intel and AMD machines running on Win32 with the Cygwin libraries (limited
774 support is available for native builds with Visual C++).</li>
Chris Lattner9235ce52009-10-16 16:30:58 +0000[diff] [blame]775<li>Sun x86 and AMD64 machines running Solaris 10, OpenSolaris 0906.</li>
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]776<li>Alpha-based machines running Debian GNU/Linux.</li>
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]777</ul>
778
Chris Lattnerba948522008-06-05 06:57:39 +0000[diff] [blame]779<p>The core LLVM infrastructure uses GNU autoconf to adapt itself
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]780to the machine and operating system on which it is built. However, minor
781porting may be required to get LLVM to work on new platforms. We welcome your
782portability patches and reports of successful builds or error messages.</p>
783
784</div>
785
786<!-- *********************************************************************** -->
787<div class="doc_section">
788 <a name="knownproblems">Known Problems</a>
789</div>
790<!-- *********************************************************************** -->
791
792<div class="doc_text">
793
Mikhail Glushenkovf61066a2009-03-01 18:09:47 +0000[diff] [blame]794<p>This section contains significant known problems with the LLVM system,
Chris Lattnerb1ad47c2008-11-10 05:40:34 +0000[diff] [blame]795listed by component. If you run into a problem, please check the <a
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]796href="http://llvm.org/bugs/">LLVM bug database</a> and submit a bug if
797there isn't already one.</p>
798
Chris Lattner1f8dc512010-03-17 17:25:49 +0000[diff] [blame]799<ul>
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]800<li>LLVM will not correctly compile on Solaris and/or OpenSolaris
801using the stock GCC 3.x.x series 'out the box',
Chris Lattnerc09ffd22009-11-03 21:50:09 +0000[diff] [blame]802See: <a href="GettingStarted.html#brokengcc">Broken versions of GCC and other tools</a>.
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]803However, A <a href="http://pkg.auroraux.org/GCC">Modern GCC Build</a>
804for x86/x86-64 has been made available from the third party AuroraUX Project
805that has been meticulously tested for bootstrapping LLVM &amp; Clang.</li>
806</ul>
807
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]808</div>
809
810<!-- ======================================================================= -->
811<div class="doc_subsection">
812 <a name="experimental">Experimental features included with this release</a>
813</div>
814
815<div class="doc_text">
816
817<p>The following components of this LLVM release are either untested, known to
818be broken or unreliable, or are in early development. These components should
819not be relied on, and bugs should not be filed against them, but they may be
820useful to some people. In particular, if you would like to work on one of these
Chris Lattnerdaeb3232008-02-12 06:29:45 +0000[diff] [blame]821components, please contact us on the <a
822href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVMdev list</a>.</p>
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]823
824<ul>
Wesley Peckbe6dc822010-03-18 14:31:30 +0000[diff] [blame]825<li>The MSIL, Alpha, SPU, MIPS, PIC16, Blackfin, MSP430, SystemZ and MicroBlaze
826 backends are experimental.</li>
Bill Wendling9c7c4382009-03-02 07:54:14 +0000[diff] [blame]827<li>The <tt>llc</tt> "<tt>-filetype=asm</tt>" (the default) is the only
Chris Lattner58b1d0f2010-03-17 04:41:49 +0000[diff] [blame]828 supported value for this option. The MachO writer is experimental, and
829 works much better in mainline SVN.</li>
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]830</ul>
831
832</div>
833
834<!-- ======================================================================= -->
835<div class="doc_subsection">
836 <a name="x86-be">Known problems with the X86 back-end</a>
837</div>
838
839<div class="doc_text">
840
841<ul>
Anton Korobeynikov77d15e22008-06-08 10:24:13 +0000[diff] [blame]842 <li>The X86 backend does not yet support
843 all <a href="http://llvm.org/PR879">inline assembly that uses the X86
844 floating point stack</a>. It supports the 'f' and 't' constraints, but not
845 'u'.</li>
Chris Lattnerd95b5962008-06-08 21:19:07 +0000[diff] [blame]846 <li>The X86 backend generates inefficient floating point code when configured
847 to generate code for systems that don't have SSE2.</li>
Duncan Sands8b4f3772008-06-08 19:38:43 +0000[diff] [blame]848 <li>Win64 code generation wasn't widely tested. Everything should work, but we
John Criswellaea8c752009-03-02 15:28:15 +0000[diff] [blame]849 expect small issues to happen. Also, llvm-gcc cannot build the mingw64
850 runtime currently due
Anton Korobeynikov77d15e22008-06-08 10:24:13 +0000[diff] [blame]851 to <a href="http://llvm.org/PR2255">several</a>
John Criswellaea8c752009-03-02 15:28:15 +0000[diff] [blame]852 <a href="http://llvm.org/PR2257">bugs</a> and due to lack of support for
853 the
854 'u' inline assembly constraint and for X87 floating point inline assembly.</li>
Dan Gohman3882ecb2008-06-08 23:05:11 +0000[diff] [blame]855 <li>The X86-64 backend does not yet support the LLVM IR instruction
Chris Lattner47202c32009-03-02 02:37:32 +0000[diff] [blame]856 <tt>va_arg</tt>. Currently, the llvm-gcc and front-ends support variadic
Dan Gohman3882ecb2008-06-08 23:05:11 +0000[diff] [blame]857 argument constructs on X86-64 by lowering them manually.</li>
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]858</ul>
859
860</div>
861
862<!-- ======================================================================= -->
863<div class="doc_subsection">
864 <a name="ppc-be">Known problems with the PowerPC back-end</a>
865</div>
866
867<div class="doc_text">
868
869<ul>
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]870<li>The Linux PPC32/ABI support needs testing for the interpreter and static
871compilation, and lacks support for debug information.</li>
872</ul>
873
874</div>
875
876<!-- ======================================================================= -->
877<div class="doc_subsection">
878 <a name="arm-be">Known problems with the ARM back-end</a>
879</div>
880
881<div class="doc_text">
882
883<ul>
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]884<li>Support for the Advanced SIMD (Neon) instruction set is still incomplete
885and not well tested. Some features may not work at all, and the code quality
886may be poor in some cases.</li>
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]887<li>Thumb mode works only on ARMv6 or higher processors. On sub-ARMv6
Duncan Sands1827fa62007-09-26 15:59:54 +0000[diff] [blame]888processors, thumb programs can crash or produce wrong
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]889results (<a href="http://llvm.org/PR1388">PR1388</a>).</li>
John Criswellaea8c752009-03-02 15:28:15 +0000[diff] [blame]890<li>Compilation for ARM Linux OABI (old ABI) is supported but not fully tested.
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]891</li>
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]892</ul>
893
894</div>
895
896<!-- ======================================================================= -->
897<div class="doc_subsection">
898 <a name="sparc-be">Known problems with the SPARC back-end</a>
899</div>
900
901<div class="doc_text">
902
903<ul>
John Criswellaea8c752009-03-02 15:28:15 +0000[diff] [blame]904<li>The SPARC backend only supports the 32-bit SPARC ABI (-m32); it does not
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]905 support the 64-bit SPARC ABI (-m64).</li>
906</ul>
907
908</div>
909
910<!-- ======================================================================= -->
911<div class="doc_subsection">
Bruno Cardoso Lopes62d45d72008-10-25 14:56:26 +0000[diff] [blame]912 <a name="mips-be">Known problems with the MIPS back-end</a>
913</div>
914
915<div class="doc_text">
916
917<ul>
Bruno Cardoso Lopes62d45d72008-10-25 14:56:26 +0000[diff] [blame]918<li>64-bit MIPS targets are not supported yet.</li>
919</ul>
920
921</div>
922
923<!-- ======================================================================= -->
924<div class="doc_subsection">
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]925 <a name="alpha-be">Known problems with the Alpha back-end</a>
926</div>
927
928<div class="doc_text">
929
930<ul>
931
932<li>On 21164s, some rare FP arithmetic sequences which may trap do not have the
933appropriate nops inserted to ensure restartability.</li>
934
935</ul>
936</div>
937
938<!-- ======================================================================= -->
939<div class="doc_subsection">
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]940 <a name="c-be">Known problems with the C back-end</a>
941</div>
942
943<div class="doc_text">
944
945<ul>
Chris Lattner499c07c2008-06-05 06:35:40 +0000[diff] [blame]946<li><a href="http://llvm.org/PR802">The C backend has only basic support for
947 inline assembly code</a>.</li>
Chris Lattnere0194462007-09-26 06:01:35 +0000[diff] [blame]948<li><a href="http://llvm.org/PR1658">The C backend violates the ABI of common
949 C++ programs</a>, preventing intermixing between C++ compiled by the CBE and
Gabor Greife33c5322009-03-02 12:02:51 +0000[diff] [blame]950 C++ code compiled with <tt>llc</tt> or native compilers.</li>
Duncan Sandsbd0ad6e2008-02-10 13:40:55 +0000[diff] [blame]951<li>The C backend does not support all exception handling constructs.</li>
Duncan Sandse6e264c2009-02-25 11:51:54 +0000[diff] [blame]952<li>The C backend does not support arbitrary precision integers.</li>
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]953</ul>
954
955</div>
956
957
958<!-- ======================================================================= -->
959<div class="doc_subsection">
Chris Lattner58b1d0f2010-03-17 04:41:49 +0000[diff] [blame]960 <a name="c-fe">Known problems with the llvm-gcc C and C++ front-end</a>
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]961</div>
962
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]963<div class="doc_text">
964
Chris Lattner499c07c2008-06-05 06:35:40 +0000[diff] [blame]965<p>The only major language feature of GCC not supported by llvm-gcc is
966 the <tt>__builtin_apply</tt> family of builtins. However, some extensions
967 are only supported on some targets. For example, trampolines are only
Duncan Sandsa73561c2008-06-08 20:18:35 +0000[diff] [blame]968 supported on some targets (these are used when you take the address of a
969 nested function).</p>
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]970
Chris Lattner499c07c2008-06-05 06:35:40 +0000[diff] [blame]971<p>If you run into GCC extensions which are not supported, please let us know.
972</p>
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]973
974</div>
975
976<!-- ======================================================================= -->
977<div class="doc_subsection">
Chris Lattner6c8a1b82008-10-30 03:58:13 +0000[diff] [blame]978 <a name="fortran-fe">Known problems with the llvm-gcc Fortran front-end</a>
979</div>
980
981<div class="doc_text">
Gabor Greif1fc8fbc2008-11-04 21:50:59 +0000[diff] [blame]982<ul>
Chris Lattner6c8a1b82008-10-30 03:58:13 +0000[diff] [blame]983<li>Fortran support generally works, but there are still several unresolved bugs
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]984 in <a href="http://llvm.org/bugs/">Bugzilla</a>. Please see the
985 tools/gfortran component for details.</li>
Gabor Greif1fc8fbc2008-11-04 21:50:59 +0000[diff] [blame]986</ul>
Chris Lattner6c8a1b82008-10-30 03:58:13 +0000[diff] [blame]987</div>
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]988
Chris Lattnerdaeb3232008-02-12 06:29:45 +0000[diff] [blame]989<!-- ======================================================================= -->
990<div class="doc_subsection">
Chris Lattner499c07c2008-06-05 06:35:40 +0000[diff] [blame]991 <a name="ada-fe">Known problems with the llvm-gcc Ada front-end</a>
Chris Lattnerdaeb3232008-02-12 06:29:45 +0000[diff] [blame]992</div>
993
994<div class="doc_text">
John Criswellaea8c752009-03-02 15:28:15 +0000[diff] [blame]995The llvm-gcc 4.2 Ada compiler works fairly well; however, this is not a mature
996technology, and problems should be expected.
Chris Lattnerdaeb3232008-02-12 06:29:45 +0000[diff] [blame]997<ul>
Duncan Sandsa73561c2008-06-08 20:18:35 +0000[diff] [blame]998<li>The Ada front-end currently only builds on X86-32. This is mainly due
John Criswellaea8c752009-03-02 15:28:15 +0000[diff] [blame]999to lack of trampoline support (pointers to nested functions) on other platforms.
1000However, it <a href="http://llvm.org/PR2006">also fails to build on X86-64</a>
Chris Lattnerdaeb3232008-02-12 06:29:45 +0000[diff] [blame]1001which does support trampolines.</li>
1002<li>The Ada front-end <a href="http://llvm.org/PR2007">fails to bootstrap</a>.
Duncan Sandsf73473e2009-02-25 11:59:06 +0000[diff] [blame]1003This is due to lack of LLVM support for <tt>setjmp</tt>/<tt>longjmp</tt> style
1004exception handling, which is used internally by the compiler.
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]1005Workaround: configure with <tt>--disable-bootstrap</tt>.</li>
Duncan Sands2dbc2e82008-10-13 17:27:23 +0000[diff] [blame]1006<li>The c380004, <a href="http://llvm.org/PR2010">c393010</a>
1007and <a href="http://llvm.org/PR2421">cxg2021</a> ACATS tests fail
Duncan Sandsf73473e2009-02-25 11:59:06 +0000[diff] [blame]1008(c380004 also fails with gcc-4.2 mainline).
1009If the compiler is built with checks disabled then <a href="http://llvm.org/PR2010">c393010</a>
1010causes the compiler to go into an infinite loop, using up all system memory.</li>
Duncan Sandsc2a29a02009-03-02 16:35:57 +0000[diff] [blame]1011<li>Some GCC specific Ada tests continue to crash the compiler.</li>
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]1012<li>The <tt>-E</tt> binder option (exception backtraces)
Chris Lattnerdaeb3232008-02-12 06:29:45 +0000[diff] [blame]1013<a href="http://llvm.org/PR1982">does not work</a> and will result in programs
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]1014crashing if an exception is raised. Workaround: do not use <tt>-E</tt>.</li>
Chris Lattnerdaeb3232008-02-12 06:29:45 +0000[diff] [blame]1015<li>Only discrete types <a href="http://llvm.org/PR1981">are allowed to start
1016or finish at a non-byte offset</a> in a record. Workaround: do not pack records
1017or use representation clauses that result in a field of a non-discrete type
1018starting or finishing in the middle of a byte.</li>
Chris Lattnerd95b5962008-06-08 21:19:07 +0000[diff] [blame]1019<li>The <tt>lli</tt> interpreter <a href="http://llvm.org/PR2009">considers
1020'main' as generated by the Ada binder to be invalid</a>.
1021Workaround: hand edit the file to use pointers for <tt>argv</tt> and
1022<tt>envp</tt> rather than integers.</li>
1023<li>The <tt>-fstack-check</tt> option <a href="http://llvm.org/PR2008">is
1024ignored</a>.</li>
Chris Lattnerdaeb3232008-02-12 06:29:45 +0000[diff] [blame]1025</ul>
1026</div>
1027
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]1028<!-- ======================================================================= -->
1029<div class="doc_subsection">
1030 <a name="ocaml-bindings">Known problems with the O'Caml bindings</a>
1031</div>
1032
1033<div class="doc_text">
1034
1035<p>The <tt>Llvm.Linkage</tt> module is broken, and has incorrect values. Only
1036<tt>Llvm.Linkage.External</tt>, <tt>Llvm.Linkage.Available_externally</tt>, and
1037<tt>Llvm.Linkage.Link_once</tt> will be correct. If you need any of the other linkage
1038modes, you'll have to write an external C library in order to expose the
1039functionality. This has been fixed in the trunk.</p>
1040</div>
1041
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]1042<!-- *********************************************************************** -->
1043<div class="doc_section">
1044 <a name="additionalinfo">Additional Information</a>
1045</div>
1046<!-- *********************************************************************** -->
1047
1048<div class="doc_text">
1049
1050<p>A wide variety of additional information is available on the <a
1051href="http://llvm.org">LLVM web page</a>, in particular in the <a
1052href="http://llvm.org/docs/">documentation</a> section. The web page also
1053contains versions of the API documentation which is up-to-date with the
1054Subversion version of the source code.
1055You can access versions of these documents specific to this release by going
1056into the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p>
1057
1058<p>If you have any questions or comments about LLVM, please feel free to contact
1059us via the <a href="http://llvm.org/docs/#maillist"> mailing
1060lists</a>.</p>
1061
1062</div>
1063
1064<!-- *********************************************************************** -->
1065
1066<hr>
1067<address>
1068 <a href="http://jigsaw.w3.org/css-validator/check/referer"><img
Misha Brukman947321d2008-12-11 17:34:48 +0000[diff] [blame]1069 src="http://jigsaw.w3.org/css-validator/images/vcss-blue" alt="Valid CSS"></a>
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]1070 <a href="http://validator.w3.org/check/referer"><img
Misha Brukman947321d2008-12-11 17:34:48 +0000[diff] [blame]1071 src="http://www.w3.org/Icons/valid-html401-blue" alt="Valid HTML 4.01"></a>
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]1072
1073 <a href="http://llvm.org/">LLVM Compiler Infrastructure</a><br>
1074 Last modified: $Date$
1075</address>
1076
1077</body>
1078</html>