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gerrit-public.fairphone.software / platform / external / llvm / d5b62520c49040fb2852e6ccf2a09aabcda13973 / . / 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
503
Chris Lattner58b1d0f2010-03-17 04:41:49 +0000[diff] [blame]504
Chris Lattner2b656342010-03-17 06:41:58 +0000[diff] [blame]505CondProp pass removed (functionality merged into jump threading).
Chris Lattner58b1d0f2010-03-17 04:41:49 +0000[diff] [blame]506AndersAA got removed (from 2.7 or mainline?)
Chris Lattner2b656342010-03-17 06:41:58 +0000[diff] [blame]507PredSimplify, LoopVR, GVNPRE got removed.
Chris Lattner58b1d0f2010-03-17 04:41:49 +0000[diff] [blame]508LLVM command line tools now overwrite their output, before they would only do this with -f.
509DOUT removed, use DEBUG(errs() instead.
510Much stuff converted to use raw_ostream instead of std::ostream.
511TargetAsmInfo renamed to MCAsmInfo
512llvm/ADT/iterator.h gone.
513
Chris Lattner2b656342010-03-17 06:41:58 +0000[diff] [blame]514
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]515</div>
516
Chris Lattnerb0d6c502007-09-21 03:54:09 +0000[diff] [blame]517<!--=========================================================================-->
518<div class="doc_subsection">
Chris Lattner47202c32009-03-02 02:37:32 +0000[diff] [blame]519<a name="coreimprovements">LLVM IR and Core Improvements</a>
Chris Lattnerc3649452008-02-10 08:17:19 +0000[diff] [blame]520</div>
521
522<div class="doc_text">
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]523<p>LLVM IR has several new features for better support of new targets and that
524expose new optimization opportunities:</p>
Chris Lattnerc3649452008-02-10 08:17:19 +0000[diff] [blame]525
Chris Lattnerc5a4e312008-06-05 06:25:56 +0000[diff] [blame]526<ul>
Jeffrey Yasskin8ee1b0a2010-01-28 01:14:43 +0000[diff] [blame]527<li>...</li>
Chris Lattnerc3649452008-02-10 08:17:19 +0000[diff] [blame]528</ul>
Mikhail Glushenkov808cd3e2008-10-13 02:08:34 +0000[diff] [blame]529
Chris Lattnerc3649452008-02-10 08:17:19 +0000[diff] [blame]530</div>
531
532<!--=========================================================================-->
533<div class="doc_subsection">
Chris Lattner8fda4952008-02-10 07:46:44 +0000[diff] [blame]534<a name="optimizer">Optimizer Improvements</a>
535</div>
536
537<div class="doc_text">
538
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]539<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]540release includes a few major enhancements and additions to the optimizers:</p>
Chris Lattner8fda4952008-02-10 07:46:44 +0000[diff] [blame]541
542<ul>
543
Jeffrey Yasskin8ee1b0a2010-01-28 01:14:43 +0000[diff] [blame]544<li>...</li>
Chris Lattner47202c32009-03-02 02:37:32 +0000[diff] [blame]545
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]546</ul>
Chris Lattner47202c32009-03-02 02:37:32 +0000[diff] [blame]547
Chris Lattner317685c2010-03-01 19:29:17 +0000[diff] [blame]548<p>Also, -anders-aa was removed</p>
549
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]550</div>
Chris Lattner47202c32009-03-02 02:37:32 +0000[diff] [blame]551
Chris Lattner47202c32009-03-02 02:37:32 +0000[diff] [blame]552
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]553<!--=========================================================================-->
554<div class="doc_subsection">
555<a name="executionengine">Interpreter and JIT Improvements</a>
556</div>
Chris Lattnerea9c2242008-10-13 21:50:36 +0000[diff] [blame]557
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]558<div class="doc_text">
559
560<ul>
Jeffrey Yasskin40715142010-01-29 19:10:38 +0000[diff] [blame]561<li>The JIT now <a
562href="http://llvm.org/viewvc/llvm-project?view=rev&revision=85295">defaults
563to compiling eagerly</a> to avoid a race condition in the lazy JIT.
564Clients that still want the lazy JIT can switch it on by calling
565<tt>ExecutionEngine::DisableLazyCompilation(false)</tt>.</li>
Jeffrey Yasskinc0577082010-02-11 01:07:39 +0000[diff] [blame]566<li>It is now possible to create more than one JIT instance in the same process.
567These JITs can generate machine code in parallel,
568although <a href="http://llvm.org/docs/ProgrammersManual.html#jitthreading">you
569still have to obey the other threading restrictions</a>.</li>
Chris Lattner0eef6e42008-06-08 02:45:07 +0000[diff] [blame]570</ul>
571
572</div>
573
574<!--=========================================================================-->
575<div class="doc_subsection">
Chris Lattner5f393542009-03-02 03:24:11 +0000[diff] [blame]576<a name="codegen">Target Independent Code Generator Improvements</a>
Chris Lattner0eef6e42008-06-08 02:45:07 +0000[diff] [blame]577</div>
578
579<div class="doc_text">
580
Mikhail Glushenkovf61066a2009-03-01 18:09:47 +0000[diff] [blame]581<p>We have put a significant amount of work into the code generator
582infrastructure, which allows us to implement more aggressive algorithms and make
583it run faster:</p>
Chris Lattner0eef6e42008-06-08 02:45:07 +0000[diff] [blame]584
585<ul>
Chris Lattner5f393542009-03-02 03:24:11 +0000[diff] [blame]586
Jeffrey Yasskin8ee1b0a2010-01-28 01:14:43 +0000[diff] [blame]587<li>...</li>
Chris Lattnerb0d6c502007-09-21 03:54:09 +0000[diff] [blame]588</ul>
Chris Lattnerb0d6c502007-09-21 03:54:09 +0000[diff] [blame]589</div>
590
Chris Lattner47202c32009-03-02 02:37:32 +0000[diff] [blame]591<!--=========================================================================-->
592<div class="doc_subsection">
593<a name="x86">X86-32 and X86-64 Target Improvements</a>
594</div>
595
596<div class="doc_text">
597<p>New features of the X86 target include:
598</p>
599
600<ul>
Chris Lattner5f393542009-03-02 03:24:11 +0000[diff] [blame]601
Jeffrey Yasskin8ee1b0a2010-01-28 01:14:43 +0000[diff] [blame]602<li>...</li>
Chris Lattner5f393542009-03-02 03:24:11 +0000[diff] [blame]603
Chris Lattner47202c32009-03-02 02:37:32 +0000[diff] [blame]604</ul>
605
Chris Lattner47202c32009-03-02 02:37:32 +0000[diff] [blame]606</div>
Chris Lattnerb0d6c502007-09-21 03:54:09 +0000[diff] [blame]607
608<!--=========================================================================-->
609<div class="doc_subsection">
Chris Lattnere1fbd752009-02-26 07:32:11 +0000[diff] [blame]610<a name="pic16">PIC16 Target Improvements</a>
611</div>
612
613<div class="doc_text">
614<p>New features of the PIC16 target include:
615</p>
616
617<ul>
Jeffrey Yasskin8ee1b0a2010-01-28 01:14:43 +0000[diff] [blame]618<li>...</li>
Chris Lattnere1fbd752009-02-26 07:32:11 +0000[diff] [blame]619</ul>
620
621<p>Things not yet supported:</p>
622
623<ul>
Chris Lattnere1fbd752009-02-26 07:32:11 +0000[diff] [blame]624<li>Variable arguments.</li>
Chris Lattner5f393542009-03-02 03:24:11 +0000[diff] [blame]625<li>Interrupts/programs.</li>
Chris Lattnere1fbd752009-02-26 07:32:11 +0000[diff] [blame]626</ul>
627
628</div>
629
Chris Lattnere1fbd752009-02-26 07:32:11 +0000[diff] [blame]630<!--=========================================================================-->
631<div class="doc_subsection">
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]632<a name="ARM">ARM Target Improvements</a>
Chris Lattner7ccc40d2009-03-01 02:30:21 +0000[diff] [blame]633</div>
634
635<div class="doc_text">
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]636<p>New features of the ARM target include:
637</p>
Chris Lattner7ccc40d2009-03-01 02:30:21 +0000[diff] [blame]638
639<ul>
Chris Lattner7ccc40d2009-03-01 02:30:21 +0000[diff] [blame]640
Jeffrey Yasskin8ee1b0a2010-01-28 01:14:43 +0000[diff] [blame]641<li>...</li>
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]642</ul>
Chris Lattner7ccc40d2009-03-01 02:30:21 +0000[diff] [blame]643
Chris Lattner7ccc40d2009-03-01 02:30:21 +0000[diff] [blame]644
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]645</div>
Chris Lattner7ccc40d2009-03-01 02:30:21 +0000[diff] [blame]646
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]647<!--=========================================================================-->
648<div class="doc_subsection">
649<a name="OtherTarget">Other Target Specific Improvements</a>
650</div>
Chris Lattner7ccc40d2009-03-01 02:30:21 +0000[diff] [blame]651
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]652<div class="doc_text">
653<p>New features of other targets include:
654</p>
655
656<ul>
Jeffrey Yasskin8ee1b0a2010-01-28 01:14:43 +0000[diff] [blame]657<li>...</li>
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]658</ul>
659
660</div>
661
662<!--=========================================================================-->
663<div class="doc_subsection">
664<a name="newapis">New Useful APIs</a>
665</div>
666
667<div class="doc_text">
668
669<p>This release includes a number of new APIs that are used internally, which
670 may also be useful for external clients.
671</p>
672
673<ul>
Jeffrey Yasskin8ee1b0a2010-01-28 01:14:43 +0000[diff] [blame]674<li>...</li>
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]675</ul>
676
677
678</div>
679
680<!--=========================================================================-->
681<div class="doc_subsection">
682<a name="otherimprovements">Other Improvements and New Features</a>
683</div>
684
685<div class="doc_text">
686<p>Other miscellaneous features include:</p>
687
688<ul>
Jeffrey Yasskin8ee1b0a2010-01-28 01:14:43 +0000[diff] [blame]689<li>...</li>
Chris Lattner7ccc40d2009-03-01 02:30:21 +0000[diff] [blame]690</ul>
691
692</div>
693
Chris Lattnere45f18b2008-06-05 08:02:49 +0000[diff] [blame]694
695<!--=========================================================================-->
696<div class="doc_subsection">
Chris Lattner92eacf82008-10-13 17:57:36 +0000[diff] [blame]697<a name="changes">Major Changes and Removed Features</a>
698</div>
699
700<div class="doc_text">
701
Chris Lattnercc64a322008-10-13 22:06:31 +0000[diff] [blame]702<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]703on LLVM 2.6, this section lists some "gotchas" that you may run into upgrading
Chris Lattnercc64a322008-10-13 22:06:31 +0000[diff] [blame]704from the previous release.</p>
Chris Lattner92eacf82008-10-13 17:57:36 +0000[diff] [blame]705
706<ul>
Jeffrey Yasskin260af332010-02-09 23:03:44 +0000[diff] [blame]707<li>The LLVM interpreter now defaults to <em>not</em> using <tt>libffi</tt> even
708if you have it installed. This makes it more likely that an LLVM built on one
709system will work when copied to a similar system. To use <tt>libffi</tt>,
710configure with <tt>--enable-libffi</tt>.
711</li>
Chris Lattnercc64a322008-10-13 22:06:31 +0000[diff] [blame]712</ul>
713
714
715<p>In addition, many APIs have changed in this release. Some of the major LLVM
716API changes are:</p>
717
718<ul>
Jeffrey Yasskin2ca16212010-01-28 01:41:20 +0000[diff] [blame]719<li><tt>ModuleProvider</tt> has been <a
720href="http://llvm.org/viewvc/llvm-project?view=rev&revision=94686">removed</a>
721and its methods moved to <tt>Module</tt> and <tt>GlobalValue</tt>.
722Most clients can remove uses of <tt>ExistingModuleProvider</tt>,
723replace <tt>getBitcodeModuleProvider</tt> with
724<tt>getLazyBitcodeModule</tt>, and pass their <tt>Module</tt> to
725functions that used to accept <tt>ModuleProvider</tt>. Clients who
726wrote their own <tt>ModuleProvider</tt>s will need to derive from
727<tt>GVMaterializer</tt> instead and use
728<tt>Module::setMaterializer</tt> to attach it to a
729<tt>Module</tt>.</li>
730
731<li><tt>GhostLinkage</tt> has given up the ghost.
732<tt>GlobalValue</tt>s that have not yet been read from their backing
733storage have the same linkage they will have after being read in.
734Clients must replace calls to
735<tt>GlobalValue::hasNotBeenReadFromBitcode</tt> with
736<tt>GlobalValue::isMaterializable</tt>.</li>
Daniel Dunbar61f41422010-02-10 04:09:52 +0000[diff] [blame]737
738<li>FIXME: Debug info has been totally redone. Add pointers to new APIs. Substantial caveats about compatibility of .ll and .bc files.</li>
739
Daniel Dunbar369889a2010-02-14 01:47:19 +0000[diff] [blame]740<li>The <tt>llvm/Support/DataTypes.h</tt> header has moved
741to <tt>llvm/System/DataTypes.h</tt>.</li>
742
Duncan Sandsdd29fc82010-02-17 17:20:17 +0000[diff] [blame]743<li>The <tt>isInteger</tt>, <tt>isIntOrIntVector</tt>, <tt>isFloatingPoint</tt>,
744<tt>isFPOrFPVector</tt> and <tt>isFPOrFPVector</tt> methods have been renamed
745<tt>isIntegerTy</tt>, <tt>isIntOrIntVectorTy</tt>, <tt>isFloatingPointTy</tt>,
746<tt>isFPOrFPVectorTy</tt> and <tt>isFPOrFPVectorTy</tt> respectively.</li>
Devang Patel0e3da1a2008-10-14 20:03:43 +0000[diff] [blame]747</ul>
Chris Lattner92eacf82008-10-13 17:57:36 +0000[diff] [blame]748
Chris Lattner92eacf82008-10-13 17:57:36 +0000[diff] [blame]749</div>
750
751
752
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]753<!-- *********************************************************************** -->
754<div class="doc_section">
755 <a name="portability">Portability and Supported Platforms</a>
756</div>
757<!-- *********************************************************************** -->
758
759<div class="doc_text">
760
761<p>LLVM is known to work on the following platforms:</p>
762
763<ul>
Mikhail Glushenkovf61066a2009-03-01 18:09:47 +0000[diff] [blame]764<li>Intel and AMD machines (IA32, X86-64, AMD64, EMT-64) running Red Hat
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]765 Linux, Fedora Core, FreeBSD and AuroraUX (and probably other unix-like
766 systems).</li>
Mikhail Glushenkovf61066a2009-03-01 18:09:47 +0000[diff] [blame]767<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]768 and 64-bit modes.</li>
Chris Lattnere0798082008-02-06 18:00:06 +0000[diff] [blame]769<li>Intel and AMD machines running on Win32 using MinGW libraries (native).</li>
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]770<li>Intel and AMD machines running on Win32 with the Cygwin libraries (limited
771 support is available for native builds with Visual C++).</li>
Chris Lattner9235ce52009-10-16 16:30:58 +0000[diff] [blame]772<li>Sun x86 and AMD64 machines running Solaris 10, OpenSolaris 0906.</li>
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]773<li>Alpha-based machines running Debian GNU/Linux.</li>
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]774</ul>
775
Chris Lattnerba948522008-06-05 06:57:39 +0000[diff] [blame]776<p>The core LLVM infrastructure uses GNU autoconf to adapt itself
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]777to the machine and operating system on which it is built. However, minor
778porting may be required to get LLVM to work on new platforms. We welcome your
779portability patches and reports of successful builds or error messages.</p>
780
781</div>
782
783<!-- *********************************************************************** -->
784<div class="doc_section">
785 <a name="knownproblems">Known Problems</a>
786</div>
787<!-- *********************************************************************** -->
788
789<div class="doc_text">
790
Mikhail Glushenkovf61066a2009-03-01 18:09:47 +0000[diff] [blame]791<p>This section contains significant known problems with the LLVM system,
Chris Lattnerb1ad47c2008-11-10 05:40:34 +0000[diff] [blame]792listed by component. If you run into a problem, please check the <a
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]793href="http://llvm.org/bugs/">LLVM bug database</a> and submit a bug if
794there isn't already one.</p>
795
Chris Lattner1f8dc512010-03-17 17:25:49 +0000[diff] [blame]796<ul>
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]797<li>LLVM will not correctly compile on Solaris and/or OpenSolaris
798using the stock GCC 3.x.x series 'out the box',
Chris Lattnerc09ffd22009-11-03 21:50:09 +0000[diff] [blame]799See: <a href="GettingStarted.html#brokengcc">Broken versions of GCC and other tools</a>.
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]800However, A <a href="http://pkg.auroraux.org/GCC">Modern GCC Build</a>
801for x86/x86-64 has been made available from the third party AuroraUX Project
802that has been meticulously tested for bootstrapping LLVM &amp; Clang.</li>
803</ul>
804
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]805</div>
806
807<!-- ======================================================================= -->
808<div class="doc_subsection">
809 <a name="experimental">Experimental features included with this release</a>
810</div>
811
812<div class="doc_text">
813
814<p>The following components of this LLVM release are either untested, known to
815be broken or unreliable, or are in early development. These components should
816not be relied on, and bugs should not be filed against them, but they may be
817useful 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]818components, please contact us on the <a
819href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVMdev list</a>.</p>
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]820
821<ul>
Wesley Peckbe6dc822010-03-18 14:31:30 +0000[diff] [blame]822<li>The MSIL, Alpha, SPU, MIPS, PIC16, Blackfin, MSP430, SystemZ and MicroBlaze
823 backends are experimental.</li>
Bill Wendling9c7c4382009-03-02 07:54:14 +0000[diff] [blame]824<li>The <tt>llc</tt> "<tt>-filetype=asm</tt>" (the default) is the only
Chris Lattner58b1d0f2010-03-17 04:41:49 +0000[diff] [blame]825 supported value for this option. The MachO writer is experimental, and
826 works much better in mainline SVN.</li>
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]827</ul>
828
829</div>
830
831<!-- ======================================================================= -->
832<div class="doc_subsection">
833 <a name="x86-be">Known problems with the X86 back-end</a>
834</div>
835
836<div class="doc_text">
837
838<ul>
Anton Korobeynikov77d15e22008-06-08 10:24:13 +0000[diff] [blame]839 <li>The X86 backend does not yet support
840 all <a href="http://llvm.org/PR879">inline assembly that uses the X86
841 floating point stack</a>. It supports the 'f' and 't' constraints, but not
842 'u'.</li>
Chris Lattnerd95b5962008-06-08 21:19:07 +0000[diff] [blame]843 <li>The X86 backend generates inefficient floating point code when configured
844 to generate code for systems that don't have SSE2.</li>
Duncan Sands8b4f3772008-06-08 19:38:43 +0000[diff] [blame]845 <li>Win64 code generation wasn't widely tested. Everything should work, but we
John Criswellaea8c752009-03-02 15:28:15 +0000[diff] [blame]846 expect small issues to happen. Also, llvm-gcc cannot build the mingw64
847 runtime currently due
Anton Korobeynikov77d15e22008-06-08 10:24:13 +0000[diff] [blame]848 to <a href="http://llvm.org/PR2255">several</a>
John Criswellaea8c752009-03-02 15:28:15 +0000[diff] [blame]849 <a href="http://llvm.org/PR2257">bugs</a> and due to lack of support for
850 the
851 'u' inline assembly constraint and for X87 floating point inline assembly.</li>
Dan Gohman3882ecb2008-06-08 23:05:11 +0000[diff] [blame]852 <li>The X86-64 backend does not yet support the LLVM IR instruction
Chris Lattner47202c32009-03-02 02:37:32 +0000[diff] [blame]853 <tt>va_arg</tt>. Currently, the llvm-gcc and front-ends support variadic
Dan Gohman3882ecb2008-06-08 23:05:11 +0000[diff] [blame]854 argument constructs on X86-64 by lowering them manually.</li>
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]855</ul>
856
857</div>
858
859<!-- ======================================================================= -->
860<div class="doc_subsection">
861 <a name="ppc-be">Known problems with the PowerPC back-end</a>
862</div>
863
864<div class="doc_text">
865
866<ul>
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]867<li>The Linux PPC32/ABI support needs testing for the interpreter and static
868compilation, and lacks support for debug information.</li>
869</ul>
870
871</div>
872
873<!-- ======================================================================= -->
874<div class="doc_subsection">
875 <a name="arm-be">Known problems with the ARM back-end</a>
876</div>
877
878<div class="doc_text">
879
880<ul>
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]881<li>Support for the Advanced SIMD (Neon) instruction set is still incomplete
882and not well tested. Some features may not work at all, and the code quality
883may be poor in some cases.</li>
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]884<li>Thumb mode works only on ARMv6 or higher processors. On sub-ARMv6
Duncan Sands1827fa62007-09-26 15:59:54 +0000[diff] [blame]885processors, thumb programs can crash or produce wrong
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]886results (<a href="http://llvm.org/PR1388">PR1388</a>).</li>
John Criswellaea8c752009-03-02 15:28:15 +0000[diff] [blame]887<li>Compilation for ARM Linux OABI (old ABI) is supported but not fully tested.
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]888</li>
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]889</ul>
890
891</div>
892
893<!-- ======================================================================= -->
894<div class="doc_subsection">
895 <a name="sparc-be">Known problems with the SPARC back-end</a>
896</div>
897
898<div class="doc_text">
899
900<ul>
John Criswellaea8c752009-03-02 15:28:15 +0000[diff] [blame]901<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]902 support the 64-bit SPARC ABI (-m64).</li>
903</ul>
904
905</div>
906
907<!-- ======================================================================= -->
908<div class="doc_subsection">
Bruno Cardoso Lopes62d45d72008-10-25 14:56:26 +0000[diff] [blame]909 <a name="mips-be">Known problems with the MIPS back-end</a>
910</div>
911
912<div class="doc_text">
913
914<ul>
Bruno Cardoso Lopes62d45d72008-10-25 14:56:26 +0000[diff] [blame]915<li>64-bit MIPS targets are not supported yet.</li>
916</ul>
917
918</div>
919
920<!-- ======================================================================= -->
921<div class="doc_subsection">
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]922 <a name="alpha-be">Known problems with the Alpha back-end</a>
923</div>
924
925<div class="doc_text">
926
927<ul>
928
929<li>On 21164s, some rare FP arithmetic sequences which may trap do not have the
930appropriate nops inserted to ensure restartability.</li>
931
932</ul>
933</div>
934
935<!-- ======================================================================= -->
936<div class="doc_subsection">
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]937 <a name="c-be">Known problems with the C back-end</a>
938</div>
939
940<div class="doc_text">
941
942<ul>
Chris Lattner499c07c2008-06-05 06:35:40 +0000[diff] [blame]943<li><a href="http://llvm.org/PR802">The C backend has only basic support for
944 inline assembly code</a>.</li>
Chris Lattnere0194462007-09-26 06:01:35 +0000[diff] [blame]945<li><a href="http://llvm.org/PR1658">The C backend violates the ABI of common
946 C++ programs</a>, preventing intermixing between C++ compiled by the CBE and
Gabor Greife33c5322009-03-02 12:02:51 +0000[diff] [blame]947 C++ code compiled with <tt>llc</tt> or native compilers.</li>
Duncan Sandsbd0ad6e2008-02-10 13:40:55 +0000[diff] [blame]948<li>The C backend does not support all exception handling constructs.</li>
Duncan Sandse6e264c2009-02-25 11:51:54 +0000[diff] [blame]949<li>The C backend does not support arbitrary precision integers.</li>
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]950</ul>
951
952</div>
953
954
955<!-- ======================================================================= -->
956<div class="doc_subsection">
Chris Lattner58b1d0f2010-03-17 04:41:49 +0000[diff] [blame]957 <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]958</div>
959
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]960<div class="doc_text">
961
Chris Lattner499c07c2008-06-05 06:35:40 +0000[diff] [blame]962<p>The only major language feature of GCC not supported by llvm-gcc is
963 the <tt>__builtin_apply</tt> family of builtins. However, some extensions
964 are only supported on some targets. For example, trampolines are only
Duncan Sandsa73561c2008-06-08 20:18:35 +0000[diff] [blame]965 supported on some targets (these are used when you take the address of a
966 nested function).</p>
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]967
Chris Lattner499c07c2008-06-05 06:35:40 +0000[diff] [blame]968<p>If you run into GCC extensions which are not supported, please let us know.
969</p>
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]970
971</div>
972
973<!-- ======================================================================= -->
974<div class="doc_subsection">
Chris Lattner6c8a1b82008-10-30 03:58:13 +0000[diff] [blame]975 <a name="fortran-fe">Known problems with the llvm-gcc Fortran front-end</a>
976</div>
977
978<div class="doc_text">
Gabor Greif1fc8fbc2008-11-04 21:50:59 +0000[diff] [blame]979<ul>
Chris Lattner6c8a1b82008-10-30 03:58:13 +0000[diff] [blame]980<li>Fortran support generally works, but there are still several unresolved bugs
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]981 in <a href="http://llvm.org/bugs/">Bugzilla</a>. Please see the
982 tools/gfortran component for details.</li>
Gabor Greif1fc8fbc2008-11-04 21:50:59 +0000[diff] [blame]983</ul>
Chris Lattner6c8a1b82008-10-30 03:58:13 +0000[diff] [blame]984</div>
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]985
Chris Lattnerdaeb3232008-02-12 06:29:45 +0000[diff] [blame]986<!-- ======================================================================= -->
987<div class="doc_subsection">
Chris Lattner499c07c2008-06-05 06:35:40 +0000[diff] [blame]988 <a name="ada-fe">Known problems with the llvm-gcc Ada front-end</a>
Chris Lattnerdaeb3232008-02-12 06:29:45 +0000[diff] [blame]989</div>
990
991<div class="doc_text">
John Criswellaea8c752009-03-02 15:28:15 +0000[diff] [blame]992The llvm-gcc 4.2 Ada compiler works fairly well; however, this is not a mature
993technology, and problems should be expected.
Chris Lattnerdaeb3232008-02-12 06:29:45 +0000[diff] [blame]994<ul>
Duncan Sandsa73561c2008-06-08 20:18:35 +0000[diff] [blame]995<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]996to lack of trampoline support (pointers to nested functions) on other platforms.
997However, 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]998which does support trampolines.</li>
999<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]1000This is due to lack of LLVM support for <tt>setjmp</tt>/<tt>longjmp</tt> style
1001exception handling, which is used internally by the compiler.
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]1002Workaround: configure with <tt>--disable-bootstrap</tt>.</li>
Duncan Sands2dbc2e82008-10-13 17:27:23 +0000[diff] [blame]1003<li>The c380004, <a href="http://llvm.org/PR2010">c393010</a>
1004and <a href="http://llvm.org/PR2421">cxg2021</a> ACATS tests fail
Duncan Sandsf73473e2009-02-25 11:59:06 +0000[diff] [blame]1005(c380004 also fails with gcc-4.2 mainline).
1006If the compiler is built with checks disabled then <a href="http://llvm.org/PR2010">c393010</a>
1007causes the compiler to go into an infinite loop, using up all system memory.</li>
Duncan Sandsc2a29a02009-03-02 16:35:57 +0000[diff] [blame]1008<li>Some GCC specific Ada tests continue to crash the compiler.</li>
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]1009<li>The <tt>-E</tt> binder option (exception backtraces)
Chris Lattnerdaeb3232008-02-12 06:29:45 +0000[diff] [blame]1010<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]1011crashing if an exception is raised. Workaround: do not use <tt>-E</tt>.</li>
Chris Lattnerdaeb3232008-02-12 06:29:45 +0000[diff] [blame]1012<li>Only discrete types <a href="http://llvm.org/PR1981">are allowed to start
1013or finish at a non-byte offset</a> in a record. Workaround: do not pack records
1014or use representation clauses that result in a field of a non-discrete type
1015starting or finishing in the middle of a byte.</li>
Chris Lattnerd95b5962008-06-08 21:19:07 +0000[diff] [blame]1016<li>The <tt>lli</tt> interpreter <a href="http://llvm.org/PR2009">considers
1017'main' as generated by the Ada binder to be invalid</a>.
1018Workaround: hand edit the file to use pointers for <tt>argv</tt> and
1019<tt>envp</tt> rather than integers.</li>
1020<li>The <tt>-fstack-check</tt> option <a href="http://llvm.org/PR2008">is
1021ignored</a>.</li>
Chris Lattnerdaeb3232008-02-12 06:29:45 +0000[diff] [blame]1022</ul>
1023</div>
1024
Chris Lattner0b6ea7a2009-10-13 17:48:04 +0000[diff] [blame]1025<!-- ======================================================================= -->
1026<div class="doc_subsection">
1027 <a name="ocaml-bindings">Known problems with the O'Caml bindings</a>
1028</div>
1029
1030<div class="doc_text">
1031
1032<p>The <tt>Llvm.Linkage</tt> module is broken, and has incorrect values. Only
1033<tt>Llvm.Linkage.External</tt>, <tt>Llvm.Linkage.Available_externally</tt>, and
1034<tt>Llvm.Linkage.Link_once</tt> will be correct. If you need any of the other linkage
1035modes, you'll have to write an external C library in order to expose the
1036functionality. This has been fixed in the trunk.</p>
1037</div>
1038
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]1039<!-- *********************************************************************** -->
1040<div class="doc_section">
1041 <a name="additionalinfo">Additional Information</a>
1042</div>
1043<!-- *********************************************************************** -->
1044
1045<div class="doc_text">
1046
1047<p>A wide variety of additional information is available on the <a
1048href="http://llvm.org">LLVM web page</a>, in particular in the <a
1049href="http://llvm.org/docs/">documentation</a> section. The web page also
1050contains versions of the API documentation which is up-to-date with the
1051Subversion version of the source code.
1052You can access versions of these documents specific to this release by going
1053into the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p>
1054
1055<p>If you have any questions or comments about LLVM, please feel free to contact
1056us via the <a href="http://llvm.org/docs/#maillist"> mailing
1057lists</a>.</p>
1058
1059</div>
1060
1061<!-- *********************************************************************** -->
1062
1063<hr>
1064<address>
1065 <a href="http://jigsaw.w3.org/css-validator/check/referer"><img
Misha Brukman947321d2008-12-11 17:34:48 +0000[diff] [blame]1066 src="http://jigsaw.w3.org/css-validator/images/vcss-blue" alt="Valid CSS"></a>
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]1067 <a href="http://validator.w3.org/check/referer"><img
Misha Brukman947321d2008-12-11 17:34:48 +0000[diff] [blame]1068 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]1069
1070 <a href="http://llvm.org/">LLVM Compiler Infrastructure</a><br>
1071 Last modified: $Date$
1072</address>
1073
1074</body>
1075</html>