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gerrit-public.fairphone.software / fp2-dev / platform / external / llvm / 69fdcd7f902256d6deec8f085f5bb12bd39f762e / . / docs / ReleaseNotes.html
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Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]7 <title>LLVM 3.1 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
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]11<h1>LLVM 3.1 Release Notes</h1>
Mikhail Glushenkovea65d7d2008-10-13 02:08:34 +0000[diff] [blame]12
Jakub Staszakf8de54f2011-12-06 23:33:07 +0000[diff] [blame]13<div>
14<img style="float:right" src="http://llvm.org/img/DragonSmall.png"
15 width="136" height="136" alt="LLVM Dragon Logo">
16</div>
Chris Lattner0e464a92010-03-17 04:02:39 +0000[diff] [blame]17
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]18<ol>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]19 <li><a href="#intro">Introduction</a></li>
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]20 <li><a href="#subproj">Sub-project Status Update</a></li>
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]21 <li><a href="#externalproj">External Projects Using LLVM 3.1</a></li>
22 <li><a href="#whatsnew">What's New in LLVM?</a></li>
Chris Lattner4b538b92004-04-30 22:17:12 +0000[diff] [blame]23 <li><a href="GettingStarted.html">Installation Instructions</a></li>
Dan Gohman44aa9212008-10-14 16:23:02 +0000[diff] [blame]24 <li><a href="#knownproblems">Known Problems</a></li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]25 <li><a href="#additionalinfo">Additional Information</a></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]26</ol>
27
Chris Lattner7911ce22004-05-23 21:07:27 +0000[diff] [blame]28<div class="doc_author">
NAKAMURA Takumib9a33632011-04-09 02:13:37 +0000[diff] [blame]29 <p>Written by the <a href="http://llvm.org/">LLVM Team</a></p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]30</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]31
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]32<h1 style="color:red">These are in-progress notes for the upcoming LLVM 3.1
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]33release.<br>
34You may prefer the
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]35<a href="http://llvm.org/releases/3.0/docs/ReleaseNotes.html">LLVM 3.0
Dan Gohmanb44f6c62010-05-03 23:51:05 +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<!-- *********************************************************************** -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]39<h2>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]40 <a name="intro">Introduction</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]41</h2>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]42<!-- *********************************************************************** -->
43
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]44<div>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]45
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]46<p>This document contains the release notes for the LLVM Compiler
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]47 Infrastructure, release 3.1. Here we describe the status of LLVM, including
Chris Lattner1ab8ce92011-11-27 18:47:37 +0000[diff] [blame]48 major improvements from the previous release, improvements in various
49 subprojects of LLVM, and some of the current users of the code.
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]50 All LLVM releases may be downloaded from
51 the <a href="http://llvm.org/releases/">LLVM releases web site</a>.</p>
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]52
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame]53<p>For more information about LLVM, including information about the latest
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]54 release, please check out the <a href="http://llvm.org/">main LLVM web
55 site</a>. If you have questions or comments,
56 the <a href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVM
57 Developer's Mailing List</a> is a good place to send them.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]58
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]59<p>Note that if you are reading this file from a Subversion checkout or the main
60 LLVM web page, this document applies to the <i>next</i> release, not the
61 current one. To see the release notes for a specific release, please see the
62 <a href="http://llvm.org/releases/">releases page</a>.</p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]63
64</div>
Michael J. Spencer60f790c2011-11-28 18:20:09 +0000[diff] [blame]65
66
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]67<!-- *********************************************************************** -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]68<h2>
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]69 <a name="subproj">Sub-project Status Update</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]70</h2>
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]71<!-- *********************************************************************** -->
Chris Lattnerea34f642008-06-08 21:34:41 +0000[diff] [blame]72
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]73<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]74
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]75<p>The LLVM 3.1 distribution currently consists of code from the core LLVM
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]76 repository (which roughly includes the LLVM optimizers, code generators and
Chris Lattnerc343e312011-11-10 20:15:40 +0000[diff] [blame]77 supporting tools), and the Clang repository. In
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]78 addition to this code, the LLVM Project includes other sub-projects that are
79 in development. Here we include updates on these subprojects.</p>
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]80
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]81<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]82<h3>
Chris Lattnerfb97b2d2008-10-13 18:11:54 +0000[diff] [blame]83<a name="clang">Clang: C/C++/Objective-C Frontend Toolkit</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]84</h3>
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]85
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]86<div>
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]87
Chris Lattner095539f2010-04-26 17:42:18 +0000[diff] [blame]88<p><a href="http://clang.llvm.org/">Clang</a> is an LLVM front end for the C,
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]89 C++, and Objective-C languages. Clang aims to provide a better user
90 experience through expressive diagnostics, a high level of conformance to
91 language standards, fast compilation, and low memory use. Like LLVM, Clang
92 provides a modular, library-based architecture that makes it suitable for
93 creating or integrating with other development tools. Clang is considered a
94 production-quality compiler for C, Objective-C, C++ and Objective-C++ on x86
Chris Lattner1ab8ce92011-11-27 18:47:37 +0000[diff] [blame]95 (32- and 64-bit), and for Darwin/ARM targets.</p>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]96
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]97<p>In the LLVM 3.1 time-frame, the Clang team has made many improvements:</p>
Douglas Gregorba087df2011-10-15 00:48:01 +0000[diff] [blame]98<ul>
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]99 <li>...</li>
Douglas Gregorba087df2011-10-15 00:48:01 +0000[diff] [blame]100</ul>
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]101
102 <p>For more details about the changes to Clang since the 2.9 release, see the
Chandler Carruthcc966de2011-11-29 00:32:43 +0000[diff] [blame]103<a href="http://clang.llvm.org/docs/ReleaseNotes.html">Clang release notes</a>
104</p>
Douglas Gregorba087df2011-10-15 00:48:01 +0000[diff] [blame]105
Michael J. Spencer60f790c2011-11-28 18:20:09 +0000[diff] [blame]106
Duncan Sandsf3ba7af2011-04-06 08:07:40 +0000[diff] [blame]107<p>If Clang rejects your code but another compiler accepts it, please take a
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]108 look at the <a href="http://clang.llvm.org/compatibility.html">language
109 compatibility</a> guide to make sure this is not intentional or a known
110 issue.</p>
Bill Wendling741748a2008-10-27 09:27:33 +0000[diff] [blame]111
Chris Lattnerfb97b2d2008-10-13 18:11:54 +0000[diff] [blame]112</div>
113
114<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]115<h3>
Duncan Sands528a5102011-04-04 11:09:08 +0000[diff] [blame]116<a name="dragonegg">DragonEgg: GCC front-ends, LLVM back-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]117</h3>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]118
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]119<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]120<p><a href="http://dragonegg.llvm.org/">DragonEgg</a> is a
121 <a href="http://gcc.gnu.org/wiki/plugins">gcc plugin</a> that replaces GCC's
Duncan Sands77352c92011-11-10 18:44:29 +0000[diff] [blame]122 optimizers and code generators with LLVM's. It works with gcc-4.5 or gcc-4.6,
123 targets the x86-32 and x86-64 processor families, and has been successfully
124 used on the Darwin, FreeBSD, KFreeBSD, Linux and OpenBSD platforms. It fully
125 supports Ada, C, C++ and Fortran. It has partial support for Go, Java, Obj-C
126 and Obj-C++.</p>
Duncan Sands749fd832010-04-02 09:23:15 +0000[diff] [blame]127
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]128<p>The 3.1 release has the following notable changes:</p>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]129
Chris Lattner1ab8ce92011-11-27 18:47:37 +0000[diff] [blame]130 <ul>
Duncan Sands77352c92011-11-10 18:44:29 +0000[diff] [blame]131
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]132 <li>...</li>
Duncan Sands77352c92011-11-10 18:44:29 +0000[diff] [blame]133
Duncan Sands4b1da2b2010-09-30 17:37:34 +0000[diff] [blame]134</ul>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]135
136</div>
137
Chris Lattner75547712010-10-03 23:49:06 +0000[diff] [blame]138<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]139<h3>
Chris Lattner75547712010-10-03 23:49:06 +0000[diff] [blame]140<a name="compiler-rt">compiler-rt: Compiler Runtime Library</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]141</h3>
Chris Lattner75547712010-10-03 23:49:06 +0000[diff] [blame]142
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]143<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]144
145<p>The new LLVM <a href="http://compiler-rt.llvm.org/">compiler-rt project</a>
146 is a simple library that provides an implementation of the low-level
147 target-specific hooks required by code generation and other runtime
148 components. For example, when compiling for a 32-bit target, converting a
149 double to a 64-bit unsigned integer is compiled into a runtime call to the
150 "__fixunsdfdi" function. The compiler-rt library provides highly optimized
151 implementations of this and other low-level routines (some are 3x faster than
152 the equivalent libgcc routines).</p>
Chris Lattner75547712010-10-03 23:49:06 +0000[diff] [blame]153
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]154<p>....</p>
Chris Lattner75547712010-10-03 23:49:06 +0000[diff] [blame]155
156</div>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]157
158<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]159<h3>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]160<a name="lldb">LLDB: Low Level Debugger</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]161</h3>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]162
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]163<div>
Michael J. Spencer60f790c2011-11-28 18:20:09 +0000[diff] [blame]164
Chris Lattner9e896712011-11-27 18:53:41 +0000[diff] [blame]165<p>LLDB is a ground-up implementation of a command line debugger, as well as a
166 debugger API that can be used from other applications. LLDB makes use of the
167 Clang parser to provide high-fidelity expression parsing (particularly for
168 C++) and uses the LLVM JIT for target support.</p>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]169
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]170<p>...</p>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]171
172</div>
173
174<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]175<h3>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]176<a name="libc++">libc++: C++ Standard Library</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]177</h3>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]178
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]179<div>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]180
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]181<p>Like compiler_rt, libc++ is now <a href="DeveloperPolicy.html#license">dual
182 licensed</a> under the MIT and UIUC license, allowing it to be used more
183 permissively.</p>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]184
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]185<p>...</p>
David Chisnall553284e2011-11-26 10:56:17 +0000[diff] [blame]186
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]187</div>
188
Chris Lattner3d6a80a2011-04-07 03:08:22 +0000[diff] [blame]189<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]190<h3>
Chris Lattner3d6a80a2011-04-07 03:08:22 +0000[diff] [blame]191<a name="vmkit">VMKit</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]192</h3>
Chris Lattner3d6a80a2011-04-07 03:08:22 +0000[diff] [blame]193
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]194<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]195
Nicolas Geoffray54d5df92011-11-10 23:37:56 +0000[diff] [blame]196 <p>The <a href="http://vmkit.llvm.org/">VMKit project</a> is an
197 implementation of a Java Virtual Machine (Java VM or JVM) that uses LLVM for
198 static and just-in-time compilation.
199
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]200 <p>In the LLVM 3.1 time-frame, VMKit has had significant improvements on both
Nicolas Geoffray54d5df92011-11-10 23:37:56 +0000[diff] [blame]201 runtime and startup performance:</p>
202
203 <ul>
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]204 <li>...</li>
Nicolas Geoffray54d5df92011-11-10 23:37:56 +0000[diff] [blame]205 </ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]206
Chris Lattner3d6a80a2011-04-07 03:08:22 +0000[diff] [blame]207</div>
Michael J. Spencer60f790c2011-11-28 18:20:09 +0000[diff] [blame]208
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]209</div>
Daniel Dunbar97b01a82010-10-04 17:39:47 +0000[diff] [blame]210
Chris Lattnerab68e9e2009-02-26 22:33:38 +0000[diff] [blame]211<!-- *********************************************************************** -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]212<h2>
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]213 <a name="externalproj">External Open Source Projects Using LLVM 3.1</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]214</h2>
Chris Lattnerab68e9e2009-02-26 22:33:38 +0000[diff] [blame]215<!-- *********************************************************************** -->
216
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]217<div>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]218
219<p>An exciting aspect of LLVM is that it is used as an enabling technology for
220 a lot of other language and tools projects. This section lists some of the
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]221 projects that have already been updated to work with LLVM 3.1.</p>
Chris Lattner75547712010-10-03 23:49:06 +0000[diff] [blame]222
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]223 ... to be filled in right before the release ...
Bill Wendling644ce532011-10-26 09:25:01 +0000[diff] [blame]224
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]225</div>
226
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]227<!-- *********************************************************************** -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]228<h2>
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]229 <a name="whatsnew">What's New in LLVM 3.1?</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]230</h2>
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]231<!-- *********************************************************************** -->
232
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]233<div>
Chris Lattnerf8e0b4e2008-06-08 22:59:35 +0000[diff] [blame]234
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]235<p>This release includes a huge number of bug fixes, performance tweaks and
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]236 minor improvements. Some of the major improvements and new features are
237 listed in this section.</p>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]238
Chris Lattner914ce462010-04-22 06:28:20 +0000[diff] [blame]239<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]240<h3>
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]241<a name="majorfeatures">Major New Features</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]242</h3>
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]243
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]244<div>
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]245
Chris Lattner1ab8ce92011-11-27 18:47:37 +0000[diff] [blame]246 <!-- Features that need text if they're finished for 3.1:
247 ARM EHABI
248 combiner-aa?
249 strong phi elim
250 loop dependence analysis
251 CorrelatedValuePropagation
252 lib/Transforms/IPO/MergeFunctions.cpp => consider for 3.1.
Chris Lattner1c80fbf2011-11-27 20:51:47 +0000[diff] [blame]253 Integrated assembler on by default for arm/thumb?
254
Chris Lattner1ab8ce92011-11-27 18:47:37 +0000[diff] [blame]255 -->
256
Chris Lattner1c80fbf2011-11-27 20:51:47 +0000[diff] [blame]257 <!-- Near dead:
Chris Lattnerdec23b62011-11-15 22:13:27 +0000[diff] [blame]258 Analysis/RegionInfo.h + Dom Frontiers
259 SparseBitVector: used in LiveVar.
Chris Lattner5a1731d2011-11-27 08:32:32 +0000[diff] [blame]260 llvm/lib/Archive - replace with lib object?
Chris Lattner1c80fbf2011-11-27 20:51:47 +0000[diff] [blame]261 -->
Chris Lattner6a007d12011-11-25 20:33:27 +0000[diff] [blame]262
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]263<p>LLVM 3.1 includes several major changes and big features:</p>
Bill Wendlingbc5f6dd2011-10-26 18:33:01 +0000[diff] [blame]264
Chris Lattner791f77b2008-06-05 06:25:56 +0000[diff] [blame]265<ul>
Kostya Serebryany1ff33e52011-12-13 19:46:24 +0000[diff] [blame]266 <li><a href="../tools/clang/docs/AddressSanitizer.html">AddressSanitizer</a>, a fast memory error detector.</li>
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]267 <li>....</li>
Chris Lattnerf304ffc2008-02-10 08:17:19 +0000[diff] [blame]268</ul>
Mikhail Glushenkovea65d7d2008-10-13 02:08:34 +0000[diff] [blame]269
Bill Wendlingbc5f6dd2011-10-26 18:33:01 +0000[diff] [blame]270</div>
271
Michael J. Spencer60f790c2011-11-28 18:20:09 +0000[diff] [blame]272
Chris Lattner4f0fe432011-11-27 19:26:30 +0000[diff] [blame]273<!--=========================================================================-->
274<h3>
275<a name="coreimprovements">LLVM IR and Core Improvements</a>
276</h3>
277
278<div>
279
280<p>LLVM IR has several new features for better support of new targets and that
281 expose new optimization opportunities:</p>
282
Chris Lattner064caf92011-11-27 21:30:28 +0000[diff] [blame]283 <ul>
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]284 <li>....</li>
Chris Lattner064caf92011-11-27 21:30:28 +0000[diff] [blame]285 </ul>
Andrew Trick5aab6382011-11-06 17:59:24 +0000[diff] [blame]286</div>
287
288<!--=========================================================================-->
289<h3>
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]290<a name="optimizer">Optimizer Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]291</h3>
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]292
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]293<div>
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]294
Chris Lattner064caf92011-11-27 21:30:28 +0000[diff] [blame]295<p>In addition to many minor performance tweaks and bug fixes, this
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]296 release includes a few major enhancements and additions to the
297 optimizers:</p>
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]298
299<ul>
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]300 <li>....</li>
Chris Lattner11b66112010-10-04 02:42:39 +0000[diff] [blame]301</ul>
302
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]303</div>
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]304
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]305<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]306<h3>
Chris Lattner4ba2b652010-09-30 16:31:33 +0000[diff] [blame]307<a name="mc">MC Level Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]308</h3>
Chris Lattner4ba2b652010-09-30 16:31:33 +0000[diff] [blame]309
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]310<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]311
312<p>The LLVM Machine Code (aka MC) subsystem was created to solve a number of
313 problems in the realm of assembly, disassembly, object file format handling,
314 and a number of other related areas that CPU instruction-set level tools work
Chris Lattner2f206022011-11-27 22:03:34 +0000[diff] [blame]315 in. For more information, please see
316 the <a href="http://blog.llvm.org/2010/04/intro-to-llvm-mc-project.html">Intro
317 to the LLVM MC Project Blog Post</a>.</p>
Chris Lattner7d9b6b42010-10-02 21:59:30 +0000[diff] [blame]318
Chris Lattner7d9b6b42010-10-02 21:59:30 +0000[diff] [blame]319<ul>
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]320 <li>....</li>
Chris Lattner7d9b6b42010-10-02 21:59:30 +0000[diff] [blame]321</ul>
322
NAKAMURA Takumi45c435a2011-04-05 08:24:22 +0000[diff] [blame]323</div>
Chris Lattner4ba2b652010-09-30 16:31:33 +0000[diff] [blame]324
Chris Lattner4ba2b652010-09-30 16:31:33 +0000[diff] [blame]325<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]326<h3>
Chris Lattner511433e2009-03-02 03:24:11 +0000[diff] [blame]327<a name="codegen">Target Independent Code Generator Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]328</h3>
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]329
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]330<div>
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]331
Mikhail Glushenkovf795ef02009-03-01 18:09:47 +0000[diff] [blame]332<p>We have put a significant amount of work into the code generator
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]333 infrastructure, which allows us to implement more aggressive algorithms and
334 make it run faster:</p>
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]335
336<ul>
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]337 <li>....</li>
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]338</ul>
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]339</div>
340
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]341<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]342<h3>
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]343<a name="x86">X86-32 and X86-64 Target Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]344</h3>
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]345
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]346<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]347
348<p>New features and major changes in the X86 target include:</p>
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]349
350<ul>
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]351 <li>....</li>
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]352</ul>
353
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]354</div>
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]355
356<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]357<h3>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]358<a name="ARM">ARM Target Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]359</h3>
Chris Lattnerc441fb82009-03-01 02:30:21 +0000[diff] [blame]360
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]361<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]362
363<p>New features of the ARM target include:</p>
Chris Lattnerc441fb82009-03-01 02:30:21 +0000[diff] [blame]364
365<ul>
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]366 <li>....</li>
Bob Wilsone8472772010-09-13 17:39:35 +0000[diff] [blame]367</ul>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]368</div>
Chris Lattner7b95c382011-11-15 22:23:46 +0000[diff] [blame]369
Michael J. Spencer60f790c2011-11-28 18:20:09 +0000[diff] [blame]370
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]371<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]372<h3>
Akira Hatanaka5381cbf2011-11-15 21:33:05 +0000[diff] [blame]373<a name="MIPS">MIPS Target Improvements</a>
374</h3>
375
376<div>
377
Chris Lattner1cc489b2011-11-27 22:12:32 +0000[diff] [blame]378<p>This release has seen major new work on just about every aspect of the MIPS
379 backend. Some of the major new features include:</p>
Akira Hatanaka5381cbf2011-11-15 21:33:05 +0000[diff] [blame]380
381<ul>
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]382 <li>....</li>
Akira Hatanaka5381cbf2011-11-15 21:33:05 +0000[diff] [blame]383</ul>
384</div>
Chris Lattner7b95c382011-11-15 22:23:46 +0000[diff] [blame]385
386<!--=========================================================================-->
387<h3>
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]388<a name="OtherTS">Other Target Specific Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]389</h3>
Chris Lattnerc441fb82009-03-01 02:30:21 +0000[diff] [blame]390
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]391<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]392
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]393<ul>
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]394 <li>....</li>
Michael J. Spencer60f790c2011-11-28 18:20:09 +0000[diff] [blame]395
Chris Lattnerd6cc2c22011-11-27 22:36:22 +0000[diff] [blame]396
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]397</ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]398
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]399</div>
Chris Lattner77d29b12008-06-05 08:02:49 +0000[diff] [blame]400
401<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]402<h3>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]403<a name="changes">Major Changes and Removed Features</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]404</h3>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]405
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]406<div>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]407
Bill Wendling2626dba2011-08-03 22:18:20 +0000[diff] [blame]408<p>If you're already an LLVM user or developer with out-of-tree changes based on
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]409 LLVM 3.1, this section lists some "gotchas" that you may run into upgrading
Bill Wendling2626dba2011-08-03 22:18:20 +0000[diff] [blame]410 from the previous release.</p>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]411
412<ul>
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]413<li>LLVM 3.1 removes support for reading LLVM 2.9 bitcode files. Going forward,
414 we aim for all future versions of LLVM to read bitcode files and .ll files
415 produced by LLVM 3.0 and later.</li>
416 <li>....</li>
Devang Patelb34dd132008-10-14 20:03:43 +0000[diff] [blame]417</ul>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]418
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]419</div>
420
Daniel Dunbarf0233c62010-10-04 20:11:41 +0000[diff] [blame]421<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]422<h3>
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]423<a name="api_changes">Internal API Changes</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]424</h3>
Daniel Dunbarf0233c62010-10-04 20:11:41 +0000[diff] [blame]425
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]426<div>
Daniel Dunbarf0233c62010-10-04 20:11:41 +0000[diff] [blame]427
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]428<p>In addition, many APIs have changed in this release. Some of the major
Bill Wendling16005252011-08-02 06:20:17 +0000[diff] [blame]429 LLVM API changes are:</p>
Daniel Dunbarf0233c62010-10-04 20:11:41 +0000[diff] [blame]430
431<ul>
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]432 <li>....</li>
Daniel Dunbarf0233c62010-10-04 20:11:41 +0000[diff] [blame]433</ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]434
Daniel Dunbarf0233c62010-10-04 20:11:41 +0000[diff] [blame]435</div>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]436
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]437</div>
438
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]439<!-- *********************************************************************** -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]440<h2>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]441 <a name="knownproblems">Known Problems</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]442</h2>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]443<!-- *********************************************************************** -->
444
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]445<div>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]446
Chris Lattner70e22012011-11-27 19:38:20 +0000[diff] [blame]447<p>LLVM is generally a production quality compiler, and is used by a broad range
448 of applications and shipping in many products. That said, not every
449 subsystem is as mature as the aggregate, particularly the more obscure
450 targets. If you run into a problem, please check the <a
451 href="http://llvm.org/bugs/">LLVM bug database</a> and submit a bug if
452 there isn't already one or ask on the <a
453 href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVMdev
454 list</a>.</p>
Michael J. Spencer60f790c2011-11-28 18:20:09 +0000[diff] [blame]455
Chris Lattner70e22012011-11-27 19:38:20 +0000[diff] [blame]456 <p>Known problem areas include:</p>
Michael J. Spencer60f790c2011-11-28 18:20:09 +0000[diff] [blame]457
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]458<ul>
Chris Lattner70e22012011-11-27 19:38:20 +0000[diff] [blame]459 <li>The Alpha, Blackfin, CellSPU, MSP430, PTX, SystemZ and
Chris Lattner1c80fbf2011-11-27 20:51:47 +0000[diff] [blame]460 XCore backends are experimental, and the Alpha, Blackfin and SystemZ
461 targets have already been removed from mainline.</li>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]462
Chris Lattner70e22012011-11-27 19:38:20 +0000[diff] [blame]463 <li>The integrated assembler, disassembler, and JIT is not supported by
464 several targets. If an integrated assembler is not supported, then a
465 system assembler is required. For more details, see the <a
466 href="CodeGenerator.html#targetfeatures">Target Features Matrix</a>.
467 </li>
Michael J. Spencer60f790c2011-11-28 18:20:09 +0000[diff] [blame]468
Chris Lattner70e22012011-11-27 19:38:20 +0000[diff] [blame]469 <li>The C backend has numerous problems and is not being actively maintained.
470 Depending on it for anything serious is not advised.</li>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]471</ul>
472
473</div>
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]474
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]475<!-- *********************************************************************** -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]476<h2>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]477 <a name="additionalinfo">Additional Information</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]478</h2>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]479<!-- *********************************************************************** -->
480
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]481<div>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]482
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]483<p>A wide variety of additional information is available on
484 the <a href="http://llvm.org/">LLVM web page</a>, in particular in
485 the <a href="http://llvm.org/docs/">documentation</a> section. The web page
486 also contains versions of the API documentation which is up-to-date with the
487 Subversion version of the source code. You can access versions of these
488 documents specific to this release by going into the "<tt>llvm/doc/</tt>"
489 directory in the LLVM tree.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]490
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]491<p>If you have any questions or comments about LLVM, please feel free to contact
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]492 us via the <a href="http://llvm.org/docs/#maillist"> mailing lists</a>.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]493
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]494</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]495
496<!-- *********************************************************************** -->
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]497
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]498<hr>
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]499<address>
Misha Brukman38847d52003-12-21 22:53:21 +0000[diff] [blame]500 <a href="http://jigsaw.w3.org/css-validator/check/referer"><img
Misha Brukman44408702008-12-11 17:34:48 +0000[diff] [blame]501 src="http://jigsaw.w3.org/css-validator/images/vcss-blue" alt="Valid CSS"></a>
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]502 <a href="http://validator.w3.org/check/referer"><img
Misha Brukman44408702008-12-11 17:34:48 +0000[diff] [blame]503 src="http://www.w3.org/Icons/valid-html401-blue" alt="Valid HTML 4.01"></a>
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]504
Chris Lattnerb4b0ce72007-05-18 00:44:29 +0000[diff] [blame]505 <a href="http://llvm.org/">LLVM Compiler Infrastructure</a><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]506 Last modified: $Date$
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]507</address>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]508
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]509</body>
510</html>