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gerrit-public.fairphone.software / fp2-dev / platform / external / llvm / 00736fc11df4b28486401b35765889da1cc9b9b1 / . / docs / ReleaseNotes.html
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Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
2 "http://www.w3.org/TR/html4/strict.dtd">
3<html>
4<head>
Reid Spencer6454ed32004-11-18 18:38:58 +0000[diff] [blame]5 <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]6 <link rel="stylesheet" href="llvm.css" type="text/css">
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]7 <title>LLVM 2.7 Release Notes</title>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]8</head>
9<body>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]10
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]11<div class="doc_title">LLVM 2.7 Release Notes</div>
Mikhail Glushenkovea65d7d2008-10-13 02:08:34 +0000[diff] [blame]12
Chris Lattner0e464a92010-03-17 04:02:39 +0000[diff] [blame]13<img align=right src="http://llvm.org/img/DragonSmall.png"
14 width="136" height="136">
15
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]16<ol>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]17 <li><a href="#intro">Introduction</a></li>
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]18 <li><a href="#subproj">Sub-project Status Update</a></li>
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]19 <li><a href="#externalproj">External Projects Using LLVM 2.7</a></li>
20 <li><a href="#whatsnew">What's New in LLVM 2.7?</a></li>
Chris Lattner4b538b92004-04-30 22:17:12 +0000[diff] [blame]21 <li><a href="GettingStarted.html">Installation Instructions</a></li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]22 <li><a href="#portability">Portability and Supported Platforms</a></li>
Dan Gohman44aa9212008-10-14 16:23:02 +0000[diff] [blame]23 <li><a href="#knownproblems">Known Problems</a></li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]24 <li><a href="#additionalinfo">Additional Information</a></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]25</ol>
26
Chris Lattner7911ce22004-05-23 21:07:27 +0000[diff] [blame]27<div class="doc_author">
Dan Gohman44aa9212008-10-14 16:23:02 +0000[diff] [blame]28 <p>Written by the <a href="http://llvm.org">LLVM Team</a></p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]29</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]30
Chris Lattner00736fc2010-04-13 06:37:00 +0000[diff] [blame^]31<!--
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]32<h1 style="color:red">These are in-progress notes for the upcoming LLVM 2.7
33release.<br>
34You may prefer the
35<a href="http://llvm.org/releases/2.6/docs/ReleaseNotes.html">LLVM 2.6
Chris Lattner00736fc2010-04-13 06:37:00 +0000[diff] [blame^]36Release Notes</a>.</h1>-->
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]37
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]38<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]39<div class="doc_section">
40 <a name="intro">Introduction</a>
41</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]42<!-- *********************************************************************** -->
43
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]44<div class="doc_text">
45
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]46<p>This document contains the release notes for the LLVM Compiler
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]47Infrastructure, release 2.7. Here we describe the status of LLVM, including
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]48major improvements from the previous release and significant known problems.
Mikhail Glushenkovf795ef02009-03-01 18:09:47 +0000[diff] [blame]49All LLVM releases may be downloaded from the <a
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]50href="http://llvm.org/releases/">LLVM releases web site</a>.</p>
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]51
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame]52<p>For more information about LLVM, including information about the latest
Chris Lattnerc463b272005-10-29 07:07:09 +0000[diff] [blame]53release, please check out the <a href="http://llvm.org/">main LLVM
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]54web site</a>. If you have questions or comments, the <a
Chris Lattnerc66bfef2010-03-17 04:41:49 +0000[diff] [blame]55href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVM Developer's
56Mailing List</a> is a good place to send them.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]57
Mikhail Glushenkovea65d7d2008-10-13 02:08:34 +0000[diff] [blame]58<p>Note that if you are reading this file from a Subversion checkout or the
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]59main LLVM web page, this document applies to the <i>next</i> release, not the
Gabor Greiffa933f82008-10-14 11:00:32 +0000[diff] [blame]60current one. To see the release notes for a specific release, please see the
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]61<a href="http://llvm.org/releases/">releases page</a>.</p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]62
Chris Lattnerc66bfef2010-03-17 04:41:49 +0000[diff] [blame]63
Chris Lattnerdc910082010-03-17 06:41:58 +0000[diff] [blame]64<p>FIXME: llvm.org moved to new server, mention new logo, Ted and Doug new code
65 owners.</p>
Chris Lattnerc66bfef2010-03-17 04:41:49 +0000[diff] [blame]66
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]67</div>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]68
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]69
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]70<!--
71Almost dead code.
72 include/llvm/Analysis/LiveValues.h => Dan
73 lib/Transforms/IPO/MergeFunctions.cpp => consider for 2.8.
74 llvm/Analysis/PointerTracking.h => Edwin wants this, consider for 2.8.
Chris Lattner00736fc2010-04-13 06:37:00 +0000[diff] [blame^]75 ABCD, GEPSplitterPass
Chris Lattner048fe3c2010-01-16 21:25:13 +0000[diff] [blame]76 MSIL backend?
Chris Lattnerdc910082010-03-17 06:41:58 +0000[diff] [blame]77 lib/Transforms/Utils/SSI.cpp -> ABCD depends on it.
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]78-->
79
80
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]81<!-- Features that need text if they're finished for 2.7:
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]82 gcc plugin.
83 strong phi elim
84 variable debug info for optimized code
Chris Lattnerab68e9e2009-02-26 22:33:38 +0000[diff] [blame]85 postalloc scheduler: anti dependence breaking, hazard recognizer?
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]86 metadata
87 loop dependence analysis
88 ELF Writer? How stable?
89 <li>PostRA scheduler improvements, ARM adoption (David Goodwin).</li>
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]90 -->
Mikhail Glushenkovea65d7d2008-10-13 02:08:34 +0000[diff] [blame]91
Chris Lattner547a3912008-10-12 19:47:48 +0000[diff] [blame]92 <!-- for announcement email:
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]93 Logo web page.
94 llvm devmtg
95 compiler_rt
96 KLEE web page at klee.llvm.org
97 Many new papers added to /pubs/
Chris Lattnerdc910082010-03-17 06:41:58 +0000[diff] [blame]98 Mention gcc plugin.
Chris Lattner74c80df2009-02-25 06:34:50 +0000[diff] [blame]99 -->
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]100
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]101<!-- *********************************************************************** -->
102<div class="doc_section">
103 <a name="subproj">Sub-project Status Update</a>
Chris Lattnerea34f642008-06-08 21:34:41 +0000[diff] [blame]104</div>
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]105<!-- *********************************************************************** -->
Chris Lattnerea34f642008-06-08 21:34:41 +0000[diff] [blame]106
107<div class="doc_text">
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]108<p>
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]109The LLVM 2.7 distribution currently consists of code from the core LLVM
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]110repository (which roughly includes the LLVM optimizers, code generators
111and supporting tools), the Clang repository and the llvm-gcc repository. In
112addition to this code, the LLVM Project includes other sub-projects that are in
113development. Here we include updates on these subprojects.
Bill Wendling63d8c552009-03-02 04:28:57 +0000[diff] [blame]114</p>
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]115
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]116</div>
117
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]118
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]119<!--=========================================================================-->
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]120<div class="doc_subsection">
Chris Lattnerfb97b2d2008-10-13 18:11:54 +0000[diff] [blame]121<a name="clang">Clang: C/C++/Objective-C Frontend Toolkit</a>
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]122</div>
123
124<div class="doc_text">
125
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]126<p>The <a href="http://clang.llvm.org/">Clang project</a> is ...</p>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]127
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]128<p>In the LLVM 2.7 time-frame, the Clang team has made many improvements:</p>
Bill Wendling741748a2008-10-27 09:27:33 +0000[diff] [blame]129
Daniel Dunbar13739432008-10-14 23:25:09 +0000[diff] [blame]130<ul>
Daniel Dunbar60dadb62010-03-25 16:09:18 +0000[diff] [blame]131<li>FIXME: C++! Include a link to cxx_compatibility.html</li>
132
133<li>FIXME: Static Analyzer improvements?</li>
134
135<li>CIndex API and Python bindings: Clang now includes a C API as part of the
136CIndex library. Although we make make some changes to the API in the future, it
137is intended to be stable and has been designed for use by external projects. See
138the Clang
139doxygen <a href="http://clang.llvm.org/doxygen/group__CINDEX.html">CIndex</a>
140documentation for more details. The CIndex API also includings an preliminary
141set of Python bindings.</li>
142
143<li>ARM Support: Clang now has ABI support for both the Darwin and Linux ARM
144ABIs. Coupled with many improvements to the LLVM ARM backend, Clang is now
145suitable for use as a a beta quality ARM compiler.</li>
Bill Wendling6bc15282009-03-02 04:28:18 +0000[diff] [blame]146</ul>
Chris Lattnerfb97b2d2008-10-13 18:11:54 +0000[diff] [blame]147</div>
148
149<!--=========================================================================-->
150<div class="doc_subsection">
151<a name="clangsa">Clang Static Analyzer</a>
152</div>
153
154<div class="doc_text">
155
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]156<p>Previously announced in the 2.4, 2.5, and 2.6 LLVM releases, the Clang project also
Ted Kremenek8b3894c2009-02-27 07:01:32 +0000[diff] [blame]157includes an early stage static source code analysis tool for <a
158href="http://clang.llvm.org/StaticAnalysis.html">automatically finding bugs</a>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]159in C and Objective-C programs. The tool performs checks to find
Ted Kremenek8b3894c2009-02-27 07:01:32 +0000[diff] [blame]160bugs that occur on a specific path within a program.</p>
Chris Lattnercc042612008-10-14 00:52:49 +0000[diff] [blame]161
Chris Lattner0e464a92010-03-17 04:02:39 +0000[diff] [blame]162<p>In the LLVM 2.7 time-frame, the analyzer core has sprouted legs and...</p>
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]163
164</div>
165
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]166<!--=========================================================================-->
167<div class="doc_subsection">
Nicolas Geoffray99a4d302008-10-14 19:23:04 +0000[diff] [blame]168<a name="vmkit">VMKit: JVM/CLI Virtual Machine Implementation</a>
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]169</div>
170
171<div class="doc_text">
172<p>
Nicolas Geoffray99a4d302008-10-14 19:23:04 +0000[diff] [blame]173The <a href="http://vmkit.llvm.org/">VMKit project</a> is an implementation of
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]174a JVM and a CLI Virtual Machine (Microsoft .NET is an
175implementation of the CLI) using LLVM for static and just-in-time
176compilation.</p>
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]177
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]178<p>
Chris Lattnerbf8e5162010-03-29 18:34:13 +0000[diff] [blame]179With the release of LLVM 2.7, VMKit has shifted to a great framework for writing
180virtual machines. VMKit now offers precise and efficient garbage collection with
181multi-threading support, thanks to the MMTk memory management toolkit, as well
182as just in time and ahead of time compilation with LLVM. The major changes in
183VMKit 0.27 are:</p>
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]184
Nicolas Geoffray99a4d302008-10-14 19:23:04 +0000[diff] [blame]185<ul>
186
Chris Lattnerbf8e5162010-03-29 18:34:13 +0000[diff] [blame]187<li>Garbage collection: VMKit now uses the MMTk toolkit for garbage collectors.
188 The first collector to be ported is the MarkSweep collector, which is precise,
189 and drastically improves the performance of VMKit.</li>
190<li>Line number information in the JVM: by using the debug metadata of LLVM, the
191 JVM now supports precise line number information, useful when printing a stack
192 trace.</li>
193<li>Interface calls in the JVM: we implemented a variant of the Interface Method
194 Table technique for interface calls in the JVM.
195</li>
Nicolas Geoffray99a4d302008-10-14 19:23:04 +0000[diff] [blame]196
197</ul>
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]198</div>
199
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]200
201<!--=========================================================================-->
202<div class="doc_subsection">
203<a name="compiler-rt">compiler-rt: Compiler Runtime Library</a>
204</div>
205
206<div class="doc_text">
207<p>
208The new LLVM <a href="http://compiler-rt.llvm.org/">compiler-rt project</a>
209is a simple library that provides an implementation of the low-level
210target-specific hooks required by code generation and other runtime components.
211For example, when compiling for a 32-bit target, converting a double to a 64-bit
212unsigned integer is compiled into a runtime call to the "__fixunsdfdi"
213function. The compiler-rt library provides highly optimized implementations of
214this and other low-level routines (some are 3x faster than the equivalent
215libgcc routines).</p>
216
217<p>
218All of the code in the compiler-rt project is available under the standard LLVM
219License, a "BSD-style" license.</p>
220
221</div>
222
223<!--=========================================================================-->
224<div class="doc_subsection">
Duncan Sands749fd832010-04-02 09:23:15 +0000[diff] [blame]225<a name="dragonegg">DragonEgg: llvm-gcc ported to gcc-4.5</a>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]226</div>
227
228<div class="doc_text">
229<p>
Duncan Sands749fd832010-04-02 09:23:15 +0000[diff] [blame]230<a href="http://dragonegg.llvm.org/">DragonEgg</a> is a port of llvm-gcc to
231gcc-4.5. Unlike llvm-gcc, which makes many intrusive changes to the underlying
232gcc-4.2 code, dragonegg in theory does not require any gcc-4.5 modifications
233whatsoever (currently one small patch is needed). This is thanks to the new
234<a href="http://gcc.gnu.org/wiki/plugins">gcc plugin architecture</a>, which
235makes it possible to modify the behaviour of gcc at runtime by loading a plugin,
236which is nothing more than a dynamic library which conforms to the gcc plugin
237interface. DragonEgg is a gcc plugin that causes the LLVM optimizers to be run
238instead of the gcc optimizers, and the LLVM code generators instead of the gcc
239code generators, just like llvm-gcc. To use it, you add
240"-fplugin=path/dragonegg.so" to the gcc-4.5 command line, and gcc-4.5 magically
241becomes llvm-gcc-4.5!
242</p>
243
244<p>
245DragonEgg is still a work in progress. Currently C works very well, while C++,
246Ada and Fortran work fairly well. All other languages either don't work at all,
247or only work poorly. For the moment only the x86-32 and x86-64 targets are
248supported, and only on linux.
249</p>
250
251<p>
252DragonEgg has not yet been released. Once gcc-4.5 has been released, dragonegg
253will probably be released as part of the following LLVM release.
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]254</p>
255
256</div>
257
258
259<!--=========================================================================-->
260<div class="doc_subsection">
261<a name="mc">llvm-mc: Machine Code Toolkit</a>
262</div>
263
264<div class="doc_text">
265<p>
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]266The LLVM Machine Code (MC) Toolkit project is ...
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]267</p>
268
269</div>
270
271
Chris Lattnerab68e9e2009-02-26 22:33:38 +0000[diff] [blame]272<!-- *********************************************************************** -->
273<div class="doc_section">
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]274 <a name="externalproj">External Open Source Projects Using LLVM 2.7</a>
Chris Lattnerab68e9e2009-02-26 22:33:38 +0000[diff] [blame]275</div>
276<!-- *********************************************************************** -->
277
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]278<div class="doc_text">
279
280<p>An exciting aspect of LLVM is that it is used as an enabling technology for
281 a lot of other language and tools projects. This section lists some of the
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]282 projects that have already been updated to work with LLVM 2.7.</p>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]283</div>
284
285
286<!--=========================================================================-->
287<div class="doc_subsection">
288<a name="Rubinius">Rubinius</a>
289</div>
290
291<div class="doc_text">
Chris Lattner0e464a92010-03-17 04:02:39 +0000[diff] [blame]292Need update.
293<!--
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]294<p><a href="http://github.com/evanphx/rubinius">Rubinius</a> is an environment
295for running Ruby code which strives to write as much of the core class
296implementation in Ruby as possible. Combined with a bytecode interpreting VM, it
297uses LLVM to optimize and compile ruby code down to machine code. Techniques
298such as type feedback, method inlining, and uncommon traps are all used to
299remove dynamism from ruby execution and increase performance.</p>
300
301<p>Since LLVM 2.5, Rubinius has made several major leaps forward, implementing
302a counter based JIT, type feedback and speculative method inlining.
Chris Lattner0e464a92010-03-17 04:02:39 +0000[diff] [blame]303-->
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]304</p>
305
306</div>
307
308<!--=========================================================================-->
309<div class="doc_subsection">
310<a name="macruby">MacRuby</a>
311</div>
312
313<div class="doc_text">
314
315<p>
Chris Lattner0e464a92010-03-17 04:02:39 +0000[diff] [blame]316Need update.
317<!--
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]318<a href="http://macruby.org">MacRuby</a> is an implementation of Ruby on top of
319core Mac OS X technologies, such as the Objective-C common runtime and garbage
320collector and the CoreFoundation framework. It is principally developed by
321Apple and aims at enabling the creation of full-fledged Mac OS X applications.
322</p>
323
324<p>
325MacRuby uses LLVM for optimization passes, JIT and AOT compilation of Ruby
326expressions. It also uses zero-cost DWARF exceptions to implement Ruby exception
Chris Lattner0e464a92010-03-17 04:02:39 +0000[diff] [blame]327handling.--> </p>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]328
329</div>
330
331
Chris Lattnerab68e9e2009-02-26 22:33:38 +0000[diff] [blame]332<!--=========================================================================-->
333<div class="doc_subsection">
334<a name="pure">Pure</a>
335</div>
336
337<div class="doc_text">
338<p>
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]339<a href="http://pure-lang.googlecode.com/">Pure</a>
340is an algebraic/functional programming language based on term rewriting.
Chris Lattnerab68e9e2009-02-26 22:33:38 +0000[diff] [blame]341Programs are collections of equations which are used to evaluate expressions in
342a symbolic fashion. Pure offers dynamic typing, eager and lazy evaluation,
Mikhail Glushenkovf795ef02009-03-01 18:09:47 +0000[diff] [blame]343lexical closures, a hygienic macro system (also based on term rewriting),
Chris Lattnerab68e9e2009-02-26 22:33:38 +0000[diff] [blame]344built-in list and matrix support (including list and matrix comprehensions) and
345an easy-to-use C interface. The interpreter uses LLVM as a backend to
346 JIT-compile Pure programs to fast native code.</p>
347
Chris Lattner477a1fd2010-03-17 17:25:49 +0000[diff] [blame]348<p>Pure versions 0.43 and later have been tested and are known to work with
349LLVM 2.7 (and continue to work with older LLVM releases >= 2.5).</p>
350
Chris Lattnerab68e9e2009-02-26 22:33:38 +0000[diff] [blame]351</div>
352
353
354<!--=========================================================================-->
355<div class="doc_subsection">
356<a name="ldc">LLVM D Compiler</a>
357</div>
358
359<div class="doc_text">
360<p>
Chris Lattner0e464a92010-03-17 04:02:39 +0000[diff] [blame]361Need update.
362<!--
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]363<a href="http://www.dsource.org/projects/ldc">LDC</a> is an implementation of
364the D Programming Language using the LLVM optimizer and code generator.
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]365The LDC project works great with the LLVM 2.6 release. General improvements in
John Criswell524a5dd2009-03-02 15:28:15 +0000[diff] [blame]366this
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]367cycle have included new inline asm constraint handling, better debug info
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]368support, general bug fixes and better x86-64 support. This has allowed
369some major improvements in LDC, getting it much closer to being as
Chris Lattner0e464a92010-03-17 04:02:39 +0000[diff] [blame]370fully featured as the original DMD compiler from DigitalMars.-->
Chris Lattnerab68e9e2009-02-26 22:33:38 +0000[diff] [blame]371</p>
372</div>
373
Chris Lattnerbc31caf2009-02-28 18:58:01 +0000[diff] [blame]374<!--=========================================================================-->
375<div class="doc_subsection">
376<a name="RoadsendPHP">Roadsend PHP</a>
377</div>
378
379<div class="doc_text">
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]380<p>
381<a href="http://code.roadsend.com/rphp">Roadsend PHP</a> (rphp) is an open
Chris Lattnercade8222009-03-02 19:07:24 +0000[diff] [blame]382source implementation of the PHP programming
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]383language that uses LLVM for its optimizer, JIT and static compiler. This is a
Chris Lattner0e464a92010-03-17 04:02:39 +0000[diff] [blame]384reimplementation of an earlier project that is now based on LLVM.
Chris Lattner477a1fd2010-03-17 17:25:49 +0000[diff] [blame]385</p>
Chris Lattnerbc31caf2009-02-28 18:58:01 +0000[diff] [blame]386</div>
Chris Lattnerab68e9e2009-02-26 22:33:38 +0000[diff] [blame]387
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]388<!--=========================================================================-->
389<div class="doc_subsection">
390<a name="UnladenSwallow">Unladen Swallow</a>
391</div>
392
393<div class="doc_text">
394<p>
395<a href="http://code.google.com/p/unladen-swallow/">Unladen Swallow</a> is a
396branch of <a href="http://python.org/">Python</a> intended to be fully
397compatible and significantly faster. It uses LLVM's optimization passes and JIT
Chris Lattnerb5f6feb2010-03-18 06:52:15 +0000[diff] [blame]398compiler.
Chris Lattner0e464a92010-03-17 04:02:39 +0000[diff] [blame]399</p>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]400</div>
401
402<!--=========================================================================-->
403<div class="doc_subsection">
404<a name="llvm-lua">llvm-lua</a>
405</div>
406
407<div class="doc_text">
408<p>
Chris Lattner0e464a92010-03-17 04:02:39 +0000[diff] [blame]409Need update.
410<!--
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]411<a href="http://code.google.com/p/llvm-lua/">LLVM-Lua</a> uses LLVM to add JIT
412and static compiling support to the Lua VM. Lua bytecode is analyzed to
413remove type checks, then LLVM is used to compile the bytecode down to machine
Chris Lattner0e464a92010-03-17 04:02:39 +0000[diff] [blame]414code.-->
415</p>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]416</div>
417
418<!--=========================================================================-->
419<div class="doc_subsection">
420<a name="icedtea">IcedTea Java Virtual Machine Implementation</a>
421</div>
422
423<div class="doc_text">
424<p>
Chris Lattner0e464a92010-03-17 04:02:39 +0000[diff] [blame]425Need update.
426<!--
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]427<a href="http://icedtea.classpath.org/wiki/Main_Page">IcedTea</a> provides a
428harness to build OpenJDK using only free software build tools and to provide
429replacements for the not-yet free parts of OpenJDK. One of the extensions that
430IcedTea provides is a new JIT compiler named <a
431href="http://icedtea.classpath.org/wiki/ZeroSharkFaq">Shark</a> which uses LLVM
432to provide native code generation without introducing processor-dependent
Chris Lattner0e464a92010-03-17 04:02:39 +0000[diff] [blame]433code.-->
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]434</p>
435</div>
436
437
Chris Lattner8d4bbbe2010-03-29 17:50:39 +0000[diff] [blame]438<!--=========================================================================-->
439<div class="doc_subsection">
440<a name="tce">TTA-based Codesign Environment (TCE)</a>
441</div>
442
443<div class="doc_text">
444<p>
445<a href="http://tce.cs.tut.fi/">TCE</a> is a toolset for designing
446application-specific processors (ASP) based on the Transport triggered
447architecture (TTA). The toolset provides a complete co-design flow from C/C++
448programs down to synthesizable VHDL and parallel program binaries. Processor
449customization points include the register files, function units, supported
450operations, and the interconnection network.</p>
451
452<p>TCE uses llvm-gcc/Clang and LLVM for C/C++ language support, target
453independent optimizations and also for parts of code generation. It generates
454new LLVM-based code generators "on the fly" for the designed TTA processors and
455loads them in to the compiler backend as runtime libraries to avoid per-target
456recompilation of larger parts of the compiler chain.</p>
457
458</div>
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]459
John Criswellf77cdab2010-04-06 14:52:14 +0000[diff] [blame]460<!--=========================================================================-->
461<div class="doc_subsection">
462<a name="safecode">SAFECode Compiler</a>
463</div>
464
465<div class="doc_text">
466<p>
467<a href="http://safecode.cs.illinois.edu">SAFECode</a> is a memory safe C
468compiler built using LLVM. It takes standard, unannotated C code, analyzes the
469code to ensure that memory accesses and array indexing operations are safe, and
470instruments the code with run-time checks when safety cannot be proven
471statically.
472</p>
473</div>
474
475
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]476<!-- *********************************************************************** -->
477<div class="doc_section">
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]478 <a name="whatsnew">What's New in LLVM 2.7?</a>
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]479</div>
480<!-- *********************************************************************** -->
481
Chris Lattnerf8e0b4e2008-06-08 22:59:35 +0000[diff] [blame]482<div class="doc_text">
483
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]484<p>This release includes a huge number of bug fixes, performance tweaks and
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]485minor improvements. Some of the major improvements and new features are listed
486in this section.
Chris Lattnerf8e0b4e2008-06-08 22:59:35 +0000[diff] [blame]487</p>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]488
Chris Lattnerf8e0b4e2008-06-08 22:59:35 +0000[diff] [blame]489</div>
490
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]491<!--=========================================================================-->
Chris Lattnerea34f642008-06-08 21:34:41 +0000[diff] [blame]492<div class="doc_subsection">
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]493<a name="majorfeatures">Major New Features</a>
494</div>
495
496<div class="doc_text">
497
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]498<p>LLVM 2.7 includes several major new capabilities:</p>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]499
500<ul>
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]501<li>...</li>
Chris Lattner8170c102008-02-10 08:18:42 +0000[diff] [blame]502</ul>
503
Chris Lattnerc66bfef2010-03-17 04:41:49 +0000[diff] [blame]504Extensible metadata solid.
505
506Debug info improvements: using metadata instead of llvm.dbg global variables.
507This brings several enhancements including improved compile times.
508
509New instruction selector.
510GHC Haskell ABI/ calling conv support.
511Pre-Alpha support for unions in IR.
512New InlineHint and StackAlignment function attributes
513Code generator MC'ized except for debug info and EH.
514New SCEV AA pass: -scev-aa
515Inliner reuses arrays allocas when inlining multiple callers to reduce stack usage.
516MC encoding and disassembler apis.
517Optimal Edge Profiling?
518Instcombine is now a library, has its own IRBuilder to simplify itself.
519New llvm/Support/Regex.h API. FileCheck now does regex's
Chris Lattnerdc910082010-03-17 06:41:58 +0000[diff] [blame]520Many subtle pointer invalidation bugs in Callgraph have been fixed and it now uses asserting value handles.
521MC Disassembler (with blog post), MCInstPrinter. Many X86 backend and AsmPrinter simplifications
522Various tools like llc and opt now read either .ll or .bc files as input.
Chris Lattner8e7f1b12010-03-29 18:42:42 +0000[diff] [blame]523Malloc and free instructions got removed, along with LowerAllocations pass.
Chris Lattnerdc910082010-03-17 06:41:58 +0000[diff] [blame]524compiler-rt support for ARM.
525completely llvm-gcc NEON support.
526Can transcode from GAS to intel syntax with "llvm-mc foo.s -output-asm-variant=1"
527JIT debug information with GDB 7.0
Chris Lattnerf04bdc52010-03-17 18:15:52 +0000[diff] [blame]528New CodeGen Level CSE
Chris Lattnerdc910082010-03-17 06:41:58 +0000[diff] [blame]529CMake can now run tests, what other improvements?
Chris Lattnerf04bdc52010-03-17 18:15:52 +0000[diff] [blame]530ARM/Thumb using reg scavenging for stack object address materialization (PEI).
Chris Lattnerdc910082010-03-17 06:41:58 +0000[diff] [blame]531New SSAUpdater and MachineSSAUpdater classes for unstructured ssa updating,
532 changed jump threading, GVN, etc to use it which simplified them and speed
533 them up.
Chris Lattner15a06112010-03-17 06:42:25 +0000[diff] [blame]534Combiner-AA improvements, why not on by default?
Chris Lattnerf04bdc52010-03-17 18:15:52 +0000[diff] [blame]535Pre-regalloc tail duplication
Chris Lattner00736fc2010-04-13 06:37:00 +0000[diff] [blame^]536x86 sibcall / tailcall optimization in CCC mode.
Chris Lattnerf04bdc52010-03-17 18:15:52 +0000[diff] [blame]537New LSR with full strength reduction mode
538The most awesome sext / zext optimization pass. ?
Chris Lattner00736fc2010-04-13 06:37:00 +0000[diff] [blame^]539Better code size analysis in loop unswitch, inliner code split out to a new
540 CodeMetrics class for reuse.
Chris Lattnerb22060d2010-03-29 18:39:28 +0000[diff] [blame]541The ARM backend now has good support for ARMv4 backend (tested on StrongARM
542 hardware), previously only supported ARMv4T and newer.
Chris Lattner00736fc2010-04-13 06:37:00 +0000[diff] [blame^]543Half-float support in APFloat
544Indirect branch + address of label (blog post), particularly useful for interpreters.
545Many changes to the pass ordering for improved optimization effectiveness.
Chris Lattnerb22060d2010-03-29 18:39:28 +0000[diff] [blame]546
Chris Lattner00736fc2010-04-13 06:37:00 +0000[diff] [blame^]547Opt now works conservatively if no target data is set (is this fully working?)
548Target data now has notion of 'native' integer data types which optimizations can use.
549ARM backend generates instructions in unified assembly syntax.
550New Analysis/InstructionSimplify.h interface for simplifying instructions that don't exist.
551Jump threading is now much more aggressive at simplifying correlated
552 conditionals and threading blocks with otherwise complex logic. CondProp pass
553 removed (functionality merged into jump threading).
554X86 and XCore supports returning arbitrary return values, returning too many values is
555 supported by returning through a hidden pointer.
556verbose-asm now produces information about spill slots and loop nests
Chris Lattnerf04bdc52010-03-17 18:15:52 +0000[diff] [blame]557
Chris Lattnerc66bfef2010-03-17 04:41:49 +0000[diff] [blame]558
Chris Lattner8e7f1b12010-03-29 18:42:42 +0000[diff] [blame]559Defaults to RTTI off, packagers should build with make REQUIRE_RTTI=1.
Chris Lattnerc66bfef2010-03-17 04:41:49 +0000[diff] [blame]560AndersAA got removed (from 2.7 or mainline?)
Chris Lattnerdc910082010-03-17 06:41:58 +0000[diff] [blame]561PredSimplify, LoopVR, GVNPRE got removed.
Chris Lattnerc66bfef2010-03-17 04:41:49 +0000[diff] [blame]562LLVM command line tools now overwrite their output, before they would only do this with -f.
563DOUT removed, use DEBUG(errs() instead.
564Much stuff converted to use raw_ostream instead of std::ostream.
565TargetAsmInfo renamed to MCAsmInfo
566llvm/ADT/iterator.h gone.
567
Chris Lattnerdc910082010-03-17 06:41:58 +0000[diff] [blame]568
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]569</div>
570
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]571<!--=========================================================================-->
572<div class="doc_subsection">
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]573<a name="coreimprovements">LLVM IR and Core Improvements</a>
Chris Lattnerf304ffc2008-02-10 08:17:19 +0000[diff] [blame]574</div>
575
576<div class="doc_text">
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]577<p>LLVM IR has several new features for better support of new targets and that
578expose new optimization opportunities:</p>
Chris Lattnerf304ffc2008-02-10 08:17:19 +0000[diff] [blame]579
Chris Lattner791f77b2008-06-05 06:25:56 +0000[diff] [blame]580<ul>
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]581<li>...</li>
Chris Lattnerf304ffc2008-02-10 08:17:19 +0000[diff] [blame]582</ul>
Mikhail Glushenkovea65d7d2008-10-13 02:08:34 +0000[diff] [blame]583
Chris Lattnerf304ffc2008-02-10 08:17:19 +0000[diff] [blame]584</div>
585
586<!--=========================================================================-->
587<div class="doc_subsection">
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]588<a name="optimizer">Optimizer Improvements</a>
589</div>
590
591<div class="doc_text">
592
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]593<p>In addition to a large array of minor performance tweaks and bug fixes, this
Chris Lattnerf3013872008-10-13 21:50:36 +0000[diff] [blame]594release includes a few major enhancements and additions to the optimizers:</p>
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]595
596<ul>
597
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]598<li>...</li>
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]599
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]600</ul>
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]601
Chris Lattnerf2201912010-03-01 19:29:17 +0000[diff] [blame]602<p>Also, -anders-aa was removed</p>
603
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]604</div>
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]605
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]606
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]607<!--=========================================================================-->
608<div class="doc_subsection">
609<a name="executionengine">Interpreter and JIT Improvements</a>
610</div>
Chris Lattnerf3013872008-10-13 21:50:36 +0000[diff] [blame]611
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]612<div class="doc_text">
613
614<ul>
Jeffrey Yasskin01eba392010-01-29 19:10:38 +0000[diff] [blame]615<li>The JIT now <a
616href="http://llvm.org/viewvc/llvm-project?view=rev&revision=85295">defaults
617to compiling eagerly</a> to avoid a race condition in the lazy JIT.
618Clients that still want the lazy JIT can switch it on by calling
619<tt>ExecutionEngine::DisableLazyCompilation(false)</tt>.</li>
Jeffrey Yasskin40966a72010-02-11 01:07:39 +0000[diff] [blame]620<li>It is now possible to create more than one JIT instance in the same process.
621These JITs can generate machine code in parallel,
622although <a href="http://llvm.org/docs/ProgrammersManual.html#jitthreading">you
623still have to obey the other threading restrictions</a>.</li>
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]624</ul>
625
626</div>
627
628<!--=========================================================================-->
629<div class="doc_subsection">
Chris Lattner511433e2009-03-02 03:24:11 +0000[diff] [blame]630<a name="codegen">Target Independent Code Generator Improvements</a>
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]631</div>
632
633<div class="doc_text">
634
Mikhail Glushenkovf795ef02009-03-01 18:09:47 +0000[diff] [blame]635<p>We have put a significant amount of work into the code generator
636infrastructure, which allows us to implement more aggressive algorithms and make
637it run faster:</p>
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]638
639<ul>
Chris Lattner511433e2009-03-02 03:24:11 +0000[diff] [blame]640
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]641<li>...</li>
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]642</ul>
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]643</div>
644
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]645<!--=========================================================================-->
646<div class="doc_subsection">
647<a name="x86">X86-32 and X86-64 Target Improvements</a>
648</div>
649
650<div class="doc_text">
651<p>New features of the X86 target include:
652</p>
653
654<ul>
Chris Lattner511433e2009-03-02 03:24:11 +0000[diff] [blame]655
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]656<li>...</li>
Chris Lattner511433e2009-03-02 03:24:11 +0000[diff] [blame]657
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]658</ul>
659
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]660</div>
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]661
662<!--=========================================================================-->
663<div class="doc_subsection">
Chris Lattner11398992009-02-26 07:32:11 +0000[diff] [blame]664<a name="pic16">PIC16 Target Improvements</a>
665</div>
666
667<div class="doc_text">
668<p>New features of the PIC16 target include:
669</p>
670
671<ul>
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]672<li>...</li>
Chris Lattner11398992009-02-26 07:32:11 +0000[diff] [blame]673</ul>
674
675<p>Things not yet supported:</p>
676
677<ul>
Chris Lattner11398992009-02-26 07:32:11 +0000[diff] [blame]678<li>Variable arguments.</li>
Chris Lattner511433e2009-03-02 03:24:11 +0000[diff] [blame]679<li>Interrupts/programs.</li>
Chris Lattner11398992009-02-26 07:32:11 +0000[diff] [blame]680</ul>
681
682</div>
683
Chris Lattner11398992009-02-26 07:32:11 +0000[diff] [blame]684<!--=========================================================================-->
685<div class="doc_subsection">
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]686<a name="ARM">ARM Target Improvements</a>
Chris Lattnerc441fb82009-03-01 02:30:21 +0000[diff] [blame]687</div>
688
689<div class="doc_text">
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]690<p>New features of the ARM target include:
691</p>
Chris Lattnerc441fb82009-03-01 02:30:21 +0000[diff] [blame]692
693<ul>
Chris Lattnerc441fb82009-03-01 02:30:21 +0000[diff] [blame]694
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]695<li>...</li>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]696</ul>
Chris Lattnerc441fb82009-03-01 02:30:21 +0000[diff] [blame]697
Chris Lattnerc441fb82009-03-01 02:30:21 +0000[diff] [blame]698
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]699</div>
Chris Lattnerc441fb82009-03-01 02:30:21 +0000[diff] [blame]700
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]701<!--=========================================================================-->
702<div class="doc_subsection">
703<a name="OtherTarget">Other Target Specific Improvements</a>
704</div>
Chris Lattnerc441fb82009-03-01 02:30:21 +0000[diff] [blame]705
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]706<div class="doc_text">
707<p>New features of other targets include:
708</p>
709
710<ul>
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]711<li>...</li>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]712</ul>
713
714</div>
715
716<!--=========================================================================-->
717<div class="doc_subsection">
718<a name="newapis">New Useful APIs</a>
719</div>
720
721<div class="doc_text">
722
723<p>This release includes a number of new APIs that are used internally, which
724 may also be useful for external clients.
725</p>
726
727<ul>
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]728<li>...</li>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]729</ul>
730
731
732</div>
733
734<!--=========================================================================-->
735<div class="doc_subsection">
736<a name="otherimprovements">Other Improvements and New Features</a>
737</div>
738
739<div class="doc_text">
740<p>Other miscellaneous features include:</p>
741
742<ul>
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]743<li>...</li>
Chris Lattnerc441fb82009-03-01 02:30:21 +0000[diff] [blame]744</ul>
745
746</div>
747
Chris Lattner77d29b12008-06-05 08:02:49 +0000[diff] [blame]748
749<!--=========================================================================-->
750<div class="doc_subsection">
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]751<a name="changes">Major Changes and Removed Features</a>
752</div>
753
754<div class="doc_text">
755
Chris Lattnereeb4da02008-10-13 22:06:31 +0000[diff] [blame]756<p>If you're already an LLVM user or developer with out-of-tree changes based
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]757on LLVM 2.6, this section lists some "gotchas" that you may run into upgrading
Chris Lattnereeb4da02008-10-13 22:06:31 +0000[diff] [blame]758from the previous release.</p>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]759
760<ul>
Jeffrey Yasskinbc83d062010-02-09 23:03:44 +0000[diff] [blame]761<li>The LLVM interpreter now defaults to <em>not</em> using <tt>libffi</tt> even
762if you have it installed. This makes it more likely that an LLVM built on one
763system will work when copied to a similar system. To use <tt>libffi</tt>,
764configure with <tt>--enable-libffi</tt>.
765</li>
Chris Lattnereeb4da02008-10-13 22:06:31 +0000[diff] [blame]766</ul>
767
768
769<p>In addition, many APIs have changed in this release. Some of the major LLVM
770API changes are:</p>
771
772<ul>
Jeffrey Yasskin4fcd6072010-01-28 01:41:20 +0000[diff] [blame]773<li><tt>ModuleProvider</tt> has been <a
774href="http://llvm.org/viewvc/llvm-project?view=rev&revision=94686">removed</a>
775and its methods moved to <tt>Module</tt> and <tt>GlobalValue</tt>.
776Most clients can remove uses of <tt>ExistingModuleProvider</tt>,
777replace <tt>getBitcodeModuleProvider</tt> with
778<tt>getLazyBitcodeModule</tt>, and pass their <tt>Module</tt> to
779functions that used to accept <tt>ModuleProvider</tt>. Clients who
780wrote their own <tt>ModuleProvider</tt>s will need to derive from
781<tt>GVMaterializer</tt> instead and use
782<tt>Module::setMaterializer</tt> to attach it to a
783<tt>Module</tt>.</li>
784
785<li><tt>GhostLinkage</tt> has given up the ghost.
786<tt>GlobalValue</tt>s that have not yet been read from their backing
787storage have the same linkage they will have after being read in.
788Clients must replace calls to
789<tt>GlobalValue::hasNotBeenReadFromBitcode</tt> with
790<tt>GlobalValue::isMaterializable</tt>.</li>
Daniel Dunbar4acdede2010-02-10 04:09:52 +0000[diff] [blame]791
792<li>FIXME: Debug info has been totally redone. Add pointers to new APIs. Substantial caveats about compatibility of .ll and .bc files.</li>
793
Daniel Dunbarca1c8162010-02-14 01:47:19 +0000[diff] [blame]794<li>The <tt>llvm/Support/DataTypes.h</tt> header has moved
795to <tt>llvm/System/DataTypes.h</tt>.</li>
796
Duncan Sands411432d2010-02-17 17:20:17 +0000[diff] [blame]797<li>The <tt>isInteger</tt>, <tt>isIntOrIntVector</tt>, <tt>isFloatingPoint</tt>,
798<tt>isFPOrFPVector</tt> and <tt>isFPOrFPVector</tt> methods have been renamed
799<tt>isIntegerTy</tt>, <tt>isIntOrIntVectorTy</tt>, <tt>isFloatingPointTy</tt>,
800<tt>isFPOrFPVectorTy</tt> and <tt>isFPOrFPVectorTy</tt> respectively.</li>
Devang Patelb34dd132008-10-14 20:03:43 +0000[diff] [blame]801</ul>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]802
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]803</div>
804
805
806
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]807<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]808<div class="doc_section">
809 <a name="portability">Portability and Supported Platforms</a>
810</div>
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]811<!-- *********************************************************************** -->
812
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]813<div class="doc_text">
814
John Criswell0b5b5e92004-12-08 20:35:47 +0000[diff] [blame]815<p>LLVM is known to work on the following platforms:</p>
Chris Lattner4654bdb2004-06-01 18:22:41 +0000[diff] [blame]816
817<ul>
Mikhail Glushenkovf795ef02009-03-01 18:09:47 +0000[diff] [blame]818<li>Intel and AMD machines (IA32, X86-64, AMD64, EMT-64) running Red Hat
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]819 Linux, Fedora Core, FreeBSD and AuroraUX (and probably other unix-like
820 systems).</li>
Mikhail Glushenkovf795ef02009-03-01 18:09:47 +0000[diff] [blame]821<li>PowerPC and X86-based Mac OS X systems, running 10.3 and above in 32-bit
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]822 and 64-bit modes.</li>
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]823<li>Intel and AMD machines running on Win32 using MinGW libraries (native).</li>
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]824<li>Intel and AMD machines running on Win32 with the Cygwin libraries (limited
825 support is available for native builds with Visual C++).</li>
Chris Lattner7e23d6e2009-10-16 16:30:58 +0000[diff] [blame]826<li>Sun x86 and AMD64 machines running Solaris 10, OpenSolaris 0906.</li>
John Criswell9321fa82005-05-13 20:28:15 +0000[diff] [blame]827<li>Alpha-based machines running Debian GNU/Linux.</li>
Chris Lattner4654bdb2004-06-01 18:22:41 +0000[diff] [blame]828</ul>
829
Chris Lattnerbc5786b2008-06-05 06:57:39 +0000[diff] [blame]830<p>The core LLVM infrastructure uses GNU autoconf to adapt itself
Brian Gaekeb0fd7612004-05-09 05:28:35 +0000[diff] [blame]831to the machine and operating system on which it is built. However, minor
832porting may be required to get LLVM to work on new platforms. We welcome your
833portability patches and reports of successful builds or error messages.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]834
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]835</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]836
837<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]838<div class="doc_section">
839 <a name="knownproblems">Known Problems</a>
840</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]841<!-- *********************************************************************** -->
842
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]843<div class="doc_text">
844
Mikhail Glushenkovf795ef02009-03-01 18:09:47 +0000[diff] [blame]845<p>This section contains significant known problems with the LLVM system,
Chris Lattnere18b32e2008-11-10 05:40:34 +0000[diff] [blame]846listed by component. If you run into a problem, please check the <a
Chris Lattnerc463b272005-10-29 07:07:09 +0000[diff] [blame]847href="http://llvm.org/bugs/">LLVM bug database</a> and submit a bug if
Chris Lattner5eccca42003-12-12 21:22:16 +0000[diff] [blame]848there isn't already one.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]849
Chris Lattner477a1fd2010-03-17 17:25:49 +0000[diff] [blame]850<ul>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]851<li>LLVM will not correctly compile on Solaris and/or OpenSolaris
852using the stock GCC 3.x.x series 'out the box',
Chris Lattner554ee4a2009-11-03 21:50:09 +0000[diff] [blame]853See: <a href="GettingStarted.html#brokengcc">Broken versions of GCC and other tools</a>.
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]854However, A <a href="http://pkg.auroraux.org/GCC">Modern GCC Build</a>
855for x86/x86-64 has been made available from the third party AuroraUX Project
856that has been meticulously tested for bootstrapping LLVM &amp; Clang.</li>
857</ul>
858
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]859</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]860
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]861<!-- ======================================================================= -->
862<div class="doc_subsection">
863 <a name="experimental">Experimental features included with this release</a>
864</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]865
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]866<div class="doc_text">
867
Misha Brukman6df9e2c2004-05-12 21:46:05 +0000[diff] [blame]868<p>The following components of this LLVM release are either untested, known to
869be broken or unreliable, or are in early development. These components should
870not be relied on, and bugs should not be filed against them, but they may be
871useful to some people. In particular, if you would like to work on one of these
Chris Lattner2b659ef2008-02-12 06:29:45 +0000[diff] [blame]872components, please contact us on the <a
873href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVMdev list</a>.</p>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]874
875<ul>
Wesley Peck7c4a1212010-03-18 14:31:30 +0000[diff] [blame]876<li>The MSIL, Alpha, SPU, MIPS, PIC16, Blackfin, MSP430, SystemZ and MicroBlaze
877 backends are experimental.</li>
Bill Wendling99dac472009-03-02 07:54:14 +0000[diff] [blame]878<li>The <tt>llc</tt> "<tt>-filetype=asm</tt>" (the default) is the only
Chris Lattnerc66bfef2010-03-17 04:41:49 +0000[diff] [blame]879 supported value for this option. The MachO writer is experimental, and
880 works much better in mainline SVN.</li>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]881</ul>
882
883</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]884
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]885<!-- ======================================================================= -->
886<div class="doc_subsection">
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]887 <a name="x86-be">Known problems with the X86 back-end</a>
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]888</div>
889
890<div class="doc_text">
891
892<ul>
Anton Korobeynikova6094be2008-06-08 10:24:13 +0000[diff] [blame]893 <li>The X86 backend does not yet support
894 all <a href="http://llvm.org/PR879">inline assembly that uses the X86
895 floating point stack</a>. It supports the 'f' and 't' constraints, but not
896 'u'.</li>
Chris Lattnere6e1b352008-06-08 21:19:07 +0000[diff] [blame]897 <li>The X86 backend generates inefficient floating point code when configured
898 to generate code for systems that don't have SSE2.</li>
Duncan Sands47eff2b2008-06-08 19:38:43 +0000[diff] [blame]899 <li>Win64 code generation wasn't widely tested. Everything should work, but we
John Criswell524a5dd2009-03-02 15:28:15 +0000[diff] [blame]900 expect small issues to happen. Also, llvm-gcc cannot build the mingw64
901 runtime currently due
Anton Korobeynikova6094be2008-06-08 10:24:13 +0000[diff] [blame]902 to <a href="http://llvm.org/PR2255">several</a>
John Criswell524a5dd2009-03-02 15:28:15 +0000[diff] [blame]903 <a href="http://llvm.org/PR2257">bugs</a> and due to lack of support for
904 the
905 'u' inline assembly constraint and for X87 floating point inline assembly.</li>
Dan Gohman8207ba92008-06-08 23:05:11 +0000[diff] [blame]906 <li>The X86-64 backend does not yet support the LLVM IR instruction
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]907 <tt>va_arg</tt>. Currently, the llvm-gcc and front-ends support variadic
Dan Gohman8207ba92008-06-08 23:05:11 +0000[diff] [blame]908 argument constructs on X86-64 by lowering them manually.</li>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]909</ul>
910
911</div>
912
913<!-- ======================================================================= -->
914<div class="doc_subsection">
915 <a name="ppc-be">Known problems with the PowerPC back-end</a>
916</div>
917
918<div class="doc_text">
919
920<ul>
Nicolas Geoffraye4285dc2007-05-15 09:21:28 +0000[diff] [blame]921<li>The Linux PPC32/ABI support needs testing for the interpreter and static
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]922compilation, and lacks support for debug information.</li>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]923</ul>
924
925</div>
926
927<!-- ======================================================================= -->
928<div class="doc_subsection">
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]929 <a name="arm-be">Known problems with the ARM back-end</a>
930</div>
931
932<div class="doc_text">
933
934<ul>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]935<li>Support for the Advanced SIMD (Neon) instruction set is still incomplete
936and not well tested. Some features may not work at all, and the code quality
937may be poor in some cases.</li>
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]938<li>Thumb mode works only on ARMv6 or higher processors. On sub-ARMv6
Duncan Sandsc90d68b2007-09-26 15:59:54 +0000[diff] [blame]939processors, thumb programs can crash or produce wrong
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]940results (<a href="http://llvm.org/PR1388">PR1388</a>).</li>
John Criswell524a5dd2009-03-02 15:28:15 +0000[diff] [blame]941<li>Compilation for ARM Linux OABI (old ABI) is supported but not fully tested.
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]942</li>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]943</ul>
944
945</div>
946
947<!-- ======================================================================= -->
948<div class="doc_subsection">
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]949 <a name="sparc-be">Known problems with the SPARC back-end</a>
950</div>
951
952<div class="doc_text">
953
954<ul>
John Criswell524a5dd2009-03-02 15:28:15 +0000[diff] [blame]955<li>The SPARC backend only supports the 32-bit SPARC ABI (-m32); it does not
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]956 support the 64-bit SPARC ABI (-m64).</li>
957</ul>
958
959</div>
960
961<!-- ======================================================================= -->
962<div class="doc_subsection">
Bruno Cardoso Lopesb7e1a4f2008-10-25 14:56:26 +0000[diff] [blame]963 <a name="mips-be">Known problems with the MIPS back-end</a>
964</div>
965
966<div class="doc_text">
967
968<ul>
Bruno Cardoso Lopesb7e1a4f2008-10-25 14:56:26 +0000[diff] [blame]969<li>64-bit MIPS targets are not supported yet.</li>
970</ul>
971
972</div>
973
974<!-- ======================================================================= -->
975<div class="doc_subsection">
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]976 <a name="alpha-be">Known problems with the Alpha back-end</a>
977</div>
978
979<div class="doc_text">
980
981<ul>
982
983<li>On 21164s, some rare FP arithmetic sequences which may trap do not have the
984appropriate nops inserted to ensure restartability.</li>
985
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]986</ul>
987</div>
988
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]989<!-- ======================================================================= -->
990<div class="doc_subsection">
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]991 <a name="c-be">Known problems with the C back-end</a>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]992</div>
993
994<div class="doc_text">
995
996<ul>
Chris Lattner5733b272008-06-05 06:35:40 +0000[diff] [blame]997<li><a href="http://llvm.org/PR802">The C backend has only basic support for
998 inline assembly code</a>.</li>
Chris Lattner725a0d82007-09-26 06:01:35 +0000[diff] [blame]999<li><a href="http://llvm.org/PR1658">The C backend violates the ABI of common
1000 C++ programs</a>, preventing intermixing between C++ compiled by the CBE and
Gabor Greif4906abe2009-03-02 12:02:51 +0000[diff] [blame]1001 C++ code compiled with <tt>llc</tt> or native compilers.</li>
Duncan Sandsf74c0cc2008-02-10 13:40:55 +0000[diff] [blame]1002<li>The C backend does not support all exception handling constructs.</li>
Duncan Sands50723a92009-02-25 11:51:54 +0000[diff] [blame]1003<li>The C backend does not support arbitrary precision integers.</li>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1004</ul>
1005
1006</div>
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]1007
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1008
1009<!-- ======================================================================= -->
1010<div class="doc_subsection">
Chris Lattnerc66bfef2010-03-17 04:41:49 +0000[diff] [blame]1011 <a name="c-fe">Known problems with the llvm-gcc C and C++ front-end</a>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1012</div>
Chris Lattner47588f92003-10-02 05:07:23 +0000[diff] [blame]1013
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1014<div class="doc_text">
Chris Lattnerc5d658a2006-03-03 00:34:26 +0000[diff] [blame]1015
Chris Lattner5733b272008-06-05 06:35:40 +0000[diff] [blame]1016<p>The only major language feature of GCC not supported by llvm-gcc is
1017 the <tt>__builtin_apply</tt> family of builtins. However, some extensions
1018 are only supported on some targets. For example, trampolines are only
Duncan Sands27aff872008-06-08 20:18:35 +0000[diff] [blame]1019 supported on some targets (these are used when you take the address of a
1020 nested function).</p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1021
Chris Lattner5733b272008-06-05 06:35:40 +0000[diff] [blame]1022<p>If you run into GCC extensions which are not supported, please let us know.
1023</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1024
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1025</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1026
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1027<!-- ======================================================================= -->
1028<div class="doc_subsection">
Chris Lattner1eb4df62008-10-30 03:58:13 +0000[diff] [blame]1029 <a name="fortran-fe">Known problems with the llvm-gcc Fortran front-end</a>
1030</div>
1031
1032<div class="doc_text">
Gabor Greifba10fe02008-11-04 21:50:59 +0000[diff] [blame]1033<ul>
Chris Lattner1eb4df62008-10-30 03:58:13 +0000[diff] [blame]1034<li>Fortran support generally works, but there are still several unresolved bugs
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]1035 in <a href="http://llvm.org/bugs/">Bugzilla</a>. Please see the
1036 tools/gfortran component for details.</li>
Gabor Greifba10fe02008-11-04 21:50:59 +0000[diff] [blame]1037</ul>
Chris Lattner1eb4df62008-10-30 03:58:13 +0000[diff] [blame]1038</div>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1039
Chris Lattner2b659ef2008-02-12 06:29:45 +0000[diff] [blame]1040<!-- ======================================================================= -->
1041<div class="doc_subsection">
Chris Lattner5733b272008-06-05 06:35:40 +0000[diff] [blame]1042 <a name="ada-fe">Known problems with the llvm-gcc Ada front-end</a>
Chris Lattner2b659ef2008-02-12 06:29:45 +0000[diff] [blame]1043</div>
1044
1045<div class="doc_text">
John Criswell524a5dd2009-03-02 15:28:15 +0000[diff] [blame]1046The llvm-gcc 4.2 Ada compiler works fairly well; however, this is not a mature
1047technology, and problems should be expected.
Chris Lattner2b659ef2008-02-12 06:29:45 +0000[diff] [blame]1048<ul>
Duncan Sands27aff872008-06-08 20:18:35 +0000[diff] [blame]1049<li>The Ada front-end currently only builds on X86-32. This is mainly due
John Criswell524a5dd2009-03-02 15:28:15 +0000[diff] [blame]1050to lack of trampoline support (pointers to nested functions) on other platforms.
1051However, it <a href="http://llvm.org/PR2006">also fails to build on X86-64</a>
Chris Lattner2b659ef2008-02-12 06:29:45 +0000[diff] [blame]1052which does support trampolines.</li>
1053<li>The Ada front-end <a href="http://llvm.org/PR2007">fails to bootstrap</a>.
Duncan Sands326a4982009-02-25 11:59:06 +0000[diff] [blame]1054This is due to lack of LLVM support for <tt>setjmp</tt>/<tt>longjmp</tt> style
1055exception handling, which is used internally by the compiler.
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]1056Workaround: configure with <tt>--disable-bootstrap</tt>.</li>
Duncan Sands978bcee2008-10-13 17:27:23 +0000[diff] [blame]1057<li>The c380004, <a href="http://llvm.org/PR2010">c393010</a>
1058and <a href="http://llvm.org/PR2421">cxg2021</a> ACATS tests fail
Duncan Sands326a4982009-02-25 11:59:06 +0000[diff] [blame]1059(c380004 also fails with gcc-4.2 mainline).
1060If the compiler is built with checks disabled then <a href="http://llvm.org/PR2010">c393010</a>
1061causes the compiler to go into an infinite loop, using up all system memory.</li>
Duncan Sandsdd3e6722009-03-02 16:35:57 +0000[diff] [blame]1062<li>Some GCC specific Ada tests continue to crash the compiler.</li>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]1063<li>The <tt>-E</tt> binder option (exception backtraces)
Chris Lattner2b659ef2008-02-12 06:29:45 +0000[diff] [blame]1064<a href="http://llvm.org/PR1982">does not work</a> and will result in programs
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]1065crashing if an exception is raised. Workaround: do not use <tt>-E</tt>.</li>
Chris Lattner2b659ef2008-02-12 06:29:45 +0000[diff] [blame]1066<li>Only discrete types <a href="http://llvm.org/PR1981">are allowed to start
1067or finish at a non-byte offset</a> in a record. Workaround: do not pack records
1068or use representation clauses that result in a field of a non-discrete type
1069starting or finishing in the middle of a byte.</li>
Chris Lattnere6e1b352008-06-08 21:19:07 +0000[diff] [blame]1070<li>The <tt>lli</tt> interpreter <a href="http://llvm.org/PR2009">considers
1071'main' as generated by the Ada binder to be invalid</a>.
1072Workaround: hand edit the file to use pointers for <tt>argv</tt> and
1073<tt>envp</tt> rather than integers.</li>
1074<li>The <tt>-fstack-check</tt> option <a href="http://llvm.org/PR2008">is
1075ignored</a>.</li>
Chris Lattner2b659ef2008-02-12 06:29:45 +0000[diff] [blame]1076</ul>
1077</div>
1078
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1079<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1080<div class="doc_section">
1081 <a name="additionalinfo">Additional Information</a>
1082</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1083<!-- *********************************************************************** -->
1084
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1085<div class="doc_text">
1086
Chris Lattner416db102005-05-16 17:13:10 +0000[diff] [blame]1087<p>A wide variety of additional information is available on the <a
Chris Lattnerb4b0ce72007-05-18 00:44:29 +0000[diff] [blame]1088href="http://llvm.org">LLVM web page</a>, in particular in the <a
1089href="http://llvm.org/docs/">documentation</a> section. The web page also
Reid Spencer669ed452007-07-09 08:04:31 +0000[diff] [blame]1090contains versions of the API documentation which is up-to-date with the
1091Subversion version of the source code.
Misha Brukman109d9e82005-03-30 19:14:24 +0000[diff] [blame]1092You can access versions of these documents specific to this release by going
1093into the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1094
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1095<p>If you have any questions or comments about LLVM, please feel free to contact
Chris Lattnerc463b272005-10-29 07:07:09 +0000[diff] [blame]1096us via the <a href="http://llvm.org/docs/#maillist"> mailing
Chris Lattner5eccca42003-12-12 21:22:16 +0000[diff] [blame]1097lists</a>.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1098
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1099</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1100
1101<!-- *********************************************************************** -->
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1102
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1103<hr>
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]1104<address>
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Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]1109
Chris Lattnerb4b0ce72007-05-18 00:44:29 +0000[diff] [blame]1110 <a href="http://llvm.org/">LLVM Compiler Infrastructure</a><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1111 Last modified: $Date$
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]1112</address>
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