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gerrit-public.fairphone.software / fp2-dev / platform / external / llvm / 88d012a9c37e7610fbc73a73e541f0bbc35f9cc1 / . / docs / ReleaseNotes.html
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Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]7 <title>LLVM 3.0 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
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]11<h1>LLVM 3.0 Release Notes</h1>
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"
Gabor Greifee2187a2010-04-22 10:21:43 +0000[diff] [blame]14 width="136" height="136" alt="LLVM Dragon Logo">
Chris Lattner0e464a92010-03-17 04:02:39 +0000[diff] [blame]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>
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]19 <li><a href="#externalproj">External Projects Using LLVM 3.0</a></li>
20 <li><a href="#whatsnew">What's New in LLVM 3.0?</a></li>
Chris Lattner4b538b92004-04-30 22:17:12 +0000[diff] [blame]21 <li><a href="GettingStarted.html">Installation Instructions</a></li>
Dan Gohman44aa9212008-10-14 16:23:02 +0000[diff] [blame]22 <li><a href="#knownproblems">Known Problems</a></li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]23 <li><a href="#additionalinfo">Additional Information</a></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]24</ol>
25
Chris Lattner7911ce22004-05-23 21:07:27 +0000[diff] [blame]26<div class="doc_author">
NAKAMURA Takumib9a33632011-04-09 02:13:37 +0000[diff] [blame]27 <p>Written by the <a href="http://llvm.org/">LLVM Team</a></p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]28</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]29
Chris Lattner49123fd2011-04-06 06:29:50 +0000[diff] [blame]30<!--
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]31<h1 style="color:red">These are in-progress notes for the upcoming LLVM 3.0
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]32release.<br>
33You may prefer the
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]34<a href="http://llvm.org/releases/2.9/docs/ReleaseNotes.html">LLVM 2.9
Dan Gohmanb44f6c62010-05-03 23:51:05 +0000[diff] [blame]35Release Notes</a>.</h1>
Chris Lattner49123fd2011-04-06 06:29:50 +0000[diff] [blame]36 -->
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
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]47 Infrastructure, release 3.0. Here we describe the status of LLVM, including
48 major improvements from the previous release and significant known problems.
49 All LLVM releases may be downloaded from
50 the <a href="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
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]53 release, please check out the <a href="http://llvm.org/">main LLVM web
54 site</a>. If you have questions or comments,
55 the <a href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVM
56 Developer's Mailing List</a> is a good place to send them.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]57
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]58<p>Note that if you are reading this file from a Subversion checkout or the main
59 LLVM web page, this document applies to the <i>next</i> release, not the
60 current one. To see the release notes for a specific release, please see the
61 <a href="http://llvm.org/releases/">releases page</a>.</p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]62
63</div>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]64
Chris Lattnere4dc1962011-04-05 23:22:33 +0000[diff] [blame]65<!-- Features that need text if they're finished for 3.1:
66 ARM EHABI
Chris Lattner914ce462010-04-22 06:28:20 +0000[diff] [blame]67 combiner-aa?
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]68 strong phi elim
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]69 loop dependence analysis
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]70 CorrelatedValuePropagation
Chris Lattnere4dc1962011-04-05 23:22:33 +0000[diff] [blame]71 lib/Transforms/IPO/MergeFunctions.cpp => consider for 3.1.
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]72 -->
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]73
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]74<!-- *********************************************************************** -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]75<h2>
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]76 <a name="subproj">Sub-project Status Update</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]77</h2>
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]78<!-- *********************************************************************** -->
Chris Lattnerea34f642008-06-08 21:34:41 +0000[diff] [blame]79
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]80<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]81
82<p>The LLVM 3.0 distribution currently consists of code from the core LLVM
83 repository (which roughly includes the LLVM optimizers, code generators and
Chris Lattnerc343e312011-11-10 20:15:40 +0000[diff] [blame]84 supporting tools), and the Clang repository. In
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]85 addition to this code, the LLVM Project includes other sub-projects that are
86 in development. Here we include updates on these subprojects.</p>
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]87
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]88<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]89<h3>
Chris Lattnerfb97b2d2008-10-13 18:11:54 +0000[diff] [blame]90<a name="clang">Clang: C/C++/Objective-C Frontend Toolkit</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]91</h3>
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]92
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]93<div>
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]94
Chris Lattner095539f2010-04-26 17:42:18 +0000[diff] [blame]95<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]96 C++, and Objective-C languages. Clang aims to provide a better user
97 experience through expressive diagnostics, a high level of conformance to
98 language standards, fast compilation, and low memory use. Like LLVM, Clang
99 provides a modular, library-based architecture that makes it suitable for
100 creating or integrating with other development tools. Clang is considered a
101 production-quality compiler for C, Objective-C, C++ and Objective-C++ on x86
102 (32- and 64-bit), and for darwin/arm targets.</p>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]103
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]104<p>In the LLVM 3.0 time-frame, the Clang team has made many improvements:</p>
Douglas Gregorba087df2011-10-15 00:48:01 +0000[diff] [blame]105
106<ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]107 <li>Greatly improved support for building C++ applications, with greater
108 stability and better diagnostics.</li>
Douglas Gregorba087df2011-10-15 00:48:01 +0000[diff] [blame]109
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]110 <li><a href="http://clang.llvm.org/cxx_status.html">Improved support</a> for
111 the <a href="http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=50372">C++
112 2011</a> standard, including implementations of non-static data member
113 initializers, alias templates, delegating constructors, the range-based
114 for loop, and implicitly-generated move constructors and move assignment
115 operators, among others.</li>
Douglas Gregorba087df2011-10-15 00:48:01 +0000[diff] [blame]116
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]117 <li>Implemented support for some features of the upcoming C1x standard,
118 including static assertions and generic selections.</li>
Douglas Gregorba087df2011-10-15 00:48:01 +0000[diff] [blame]119
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]120 <li>Better detection of include and linking paths for system headers and
121 libraries, especially for Linux distributions.</li>
Douglas Gregorba087df2011-10-15 00:48:01 +0000[diff] [blame]122
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]123 <li>Implemented support
124 for <a href="http://clang.llvm.org/docs/AutomaticReferenceCounting.html">Automatic
125 Reference Counting</a> for Objective-C.</li>
Douglas Gregorba087df2011-10-15 00:48:01 +0000[diff] [blame]126
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]127 <li>Implemented a number of optimizations in <tt>libclang</tt>, the Clang C
128 interface, to improve the performance of code completion and the mapping
129 from source locations to abstract syntax tree nodes.</li>
Douglas Gregorba087df2011-10-15 00:48:01 +0000[diff] [blame]130</ul>
131
Chris Lattner0a6f6d52011-04-05 07:19:28 +0000[diff] [blame]132
Duncan Sandsf3ba7af2011-04-06 08:07:40 +0000[diff] [blame]133<p>If Clang rejects your code but another compiler accepts it, please take a
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]134 look at the <a href="http://clang.llvm.org/compatibility.html">language
135 compatibility</a> guide to make sure this is not intentional or a known
136 issue.</p>
Bill Wendling741748a2008-10-27 09:27:33 +0000[diff] [blame]137
Chris Lattnerfb97b2d2008-10-13 18:11:54 +0000[diff] [blame]138</div>
139
140<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]141<h3>
Duncan Sands528a5102011-04-04 11:09:08 +0000[diff] [blame]142<a name="dragonegg">DragonEgg: GCC front-ends, LLVM back-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]143</h3>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]144
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]145<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]146<p><a href="http://dragonegg.llvm.org/">DragonEgg</a> is a
147 <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]148 optimizers and code generators with LLVM's. It works with gcc-4.5 or gcc-4.6,
149 targets the x86-32 and x86-64 processor families, and has been successfully
150 used on the Darwin, FreeBSD, KFreeBSD, Linux and OpenBSD platforms. It fully
151 supports Ada, C, C++ and Fortran. It has partial support for Go, Java, Obj-C
152 and Obj-C++.</p>
Duncan Sands749fd832010-04-02 09:23:15 +0000[diff] [blame]153
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]154<p>The 3.0 release has the following notable changes:</p>
155
Duncan Sands77352c92011-11-10 18:44:29 +0000[diff] [blame]156 <li>GCC version 4.6 is now fully supported.</li>
157
158 <li>Patching and building GCC is no longer required: the plugin should work
159 with your system GCC (version 4.5 or 4.6; on Debian/Ubuntu systems the
160 gcc-4.5-plugin-dev or gcc-4.6-plugin-dev package is also needed).</li>
161
162 <li>The <tt>-fplugin-arg-dragonegg-enable-gcc-optzns</tt> option, which runs
163 GCC's optimizers as well as LLVM's, now works much better. This is the
164 option to use if you want ultimate performance! It not yet completely
165 stable: it may cause the plugin to crash.</li>
166
167 <li>The type and constant conversion logic has been almost entirely rewritten,
168 fixing a multitude of obscure bugs.</li>
169
Duncan Sands4b1da2b2010-09-30 17:37:34 +0000[diff] [blame]170<ul>
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]171<!--
172<li></li>
173-->
Duncan Sands4b1da2b2010-09-30 17:37:34 +0000[diff] [blame]174</ul>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]175
176</div>
177
Chris Lattner75547712010-10-03 23:49:06 +0000[diff] [blame]178<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]179<h3>
Chris Lattner75547712010-10-03 23:49:06 +0000[diff] [blame]180<a name="compiler-rt">compiler-rt: Compiler Runtime Library</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]181</h3>
Chris Lattner75547712010-10-03 23:49:06 +0000[diff] [blame]182
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]183<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]184
185<p>The new LLVM <a href="http://compiler-rt.llvm.org/">compiler-rt project</a>
186 is a simple library that provides an implementation of the low-level
187 target-specific hooks required by code generation and other runtime
188 components. For example, when compiling for a 32-bit target, converting a
189 double to a 64-bit unsigned integer is compiled into a runtime call to the
190 "__fixunsdfdi" function. The compiler-rt library provides highly optimized
191 implementations of this and other low-level routines (some are 3x faster than
192 the equivalent libgcc routines).</p>
Chris Lattner75547712010-10-03 23:49:06 +0000[diff] [blame]193
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]194<p>In the LLVM 3.0 timeframe,</p>
Chris Lattner75547712010-10-03 23:49:06 +0000[diff] [blame]195
196</div>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]197
198<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]199<h3>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]200<a name="lldb">LLDB: Low Level Debugger</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]201</h3>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]202
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]203<div>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]204
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]205<p>LLDB has advanced by leaps and bounds in the 3.0 timeframe. It is
206 dramatically more stable and useful, and includes both a
207 new <a href="http://lldb.llvm.org/tutorial.html">tutorial</a> and
208 a <a href="http://lldb.llvm.org/lldb-gdb.html">side-by-side comparison with
209 GDB</a>.</p>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]210
211</div>
212
213<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]214<h3>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]215<a name="libc++">libc++: C++ Standard Library</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]216</h3>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]217
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]218<div>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]219
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]220<p>Like compiler_rt, libc++ is now <a href="DeveloperPolicy.html#license">dual
221 licensed</a> under the MIT and UIUC license, allowing it to be used more
222 permissively.</p>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]223
224</div>
225
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]226
Chris Lattner3d6a80a2011-04-07 03:08:22 +0000[diff] [blame]227<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]228<h3>
Chris Lattner3d6a80a2011-04-07 03:08:22 +0000[diff] [blame]229<a name="LLBrowse">LLBrowse: IR Browser</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]230</h3>
Daniel Dunbar97b01a82010-10-04 17:39:47 +0000[diff] [blame]231
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]232<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]233
234<p><a href="http://llvm.org/svn/llvm-project/llbrowse/trunk/doc/LLBrowse.html">
235 LLBrowse</a> is an interactive viewer for LLVM modules. It can load any LLVM
236 module and displays its contents as an expandable tree view, facilitating an
237 easy way to inspect types, functions, global variables, or metadata nodes. It
238 is fully cross-platform, being based on the popular wxWidgets GUI
239 toolkit.</p>
240
Chris Lattner3d6a80a2011-04-07 03:08:22 +0000[diff] [blame]241</div>
242
243<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]244<h3>
Chris Lattner3d6a80a2011-04-07 03:08:22 +0000[diff] [blame]245<a name="vmkit">VMKit</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]246</h3>
Chris Lattner3d6a80a2011-04-07 03:08:22 +0000[diff] [blame]247
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]248<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]249
Nicolas Geoffray54d5df92011-11-10 23:37:56 +0000[diff] [blame]250 <p>The <a href="http://vmkit.llvm.org/">VMKit project</a> is an
251 implementation of a Java Virtual Machine (Java VM or JVM) that uses LLVM for
252 static and just-in-time compilation.
253
254 <p>In the LLVM 3.0 time-frame, VMKit has had significant improvements on both
255 runtime and startup performance:</p>
256
257 <ul>
258 <li>Precompilation: by compiling ahead of time a small subset of Java's core
259 library, the startup performance have been highly optimized to the point that
260 running a 'Hello World' program takes less than 30 milliseconds.</li>
261
262 <li>Customization: by customizing virtual methods for individual classes,
263 the VM can statically determine the target of a virtual call, and decide to
264 inline it.</li>
265
266 <li>Inlining: the VM does more inlining than it did before, by allowing more
267 bytecode instructions to be inlined, and thanks to customization. It also
268 inlines GC barriers, and object allocations.</li>
269
270 <li>New exception model: the generated code for a method that does not do
271 any try/catch is not penalized anymore by the eventuality of calling a
272 method that throws an exception. Instead, the method that throws the
273 exception jumps directly to the method that could catch it.</li>
274 </ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]275
Chris Lattner3d6a80a2011-04-07 03:08:22 +0000[diff] [blame]276</div>
277
278
Daniel Dunbar97b01a82010-10-04 17:39:47 +0000[diff] [blame]279<!--=========================================================================-->
Chris Lattner7a8e6c52011-04-05 18:38:45 +0000[diff] [blame]280<!--
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]281<h3>
Daniel Dunbar97b01a82010-10-04 17:39:47 +0000[diff] [blame]282<a name="klee">KLEE: A Symbolic Execution Virtual Machine</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]283</h3>
Daniel Dunbar97b01a82010-10-04 17:39:47 +0000[diff] [blame]284
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]285<div>
Daniel Dunbar97b01a82010-10-04 17:39:47 +0000[diff] [blame]286<p>
287<a href="http://klee.llvm.org/">KLEE</a> is a symbolic execution framework for
288programs in LLVM bitcode form. KLEE tries to symbolically evaluate "all" paths
289through the application and records state transitions that lead to fault
290states. This allows it to construct testcases that lead to faults and can even
291be used to verify some algorithms.
292</p>
293
Chris Lattnerbe2e1b52011-03-10 07:43:44 +0000[diff] [blame]294<p>UPDATE!</p>
Chris Lattner7a8e6c52011-04-05 18:38:45 +0000[diff] [blame]295</div>-->
Daniel Dunbar97b01a82010-10-04 17:39:47 +0000[diff] [blame]296
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]297</div>
Daniel Dunbar97b01a82010-10-04 17:39:47 +0000[diff] [blame]298
Chris Lattnerab68e9e2009-02-26 22:33:38 +0000[diff] [blame]299<!-- *********************************************************************** -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]300<h2>
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]301 <a name="externalproj">External Open Source Projects Using LLVM 3.0</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]302</h2>
Chris Lattnerab68e9e2009-02-26 22:33:38 +0000[diff] [blame]303<!-- *********************************************************************** -->
304
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]305<div>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]306
307<p>An exciting aspect of LLVM is that it is used as an enabling technology for
308 a lot of other language and tools projects. This section lists some of the
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]309 projects that have already been updated to work with LLVM 3.0.</p>
Chris Lattner75547712010-10-03 23:49:06 +0000[diff] [blame]310
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]311<!--=========================================================================-->
Bill Wendling7be6bc52011-10-26 00:17:54 +0000[diff] [blame]312<h3>AddressSanitizer</h3>
313
314<div>
315
316<p><a href="http://code.google.com/p/address-sanitizer/">AddressSanitizer</a>
317 uses compiler instrumentation and a specialized malloc library to find C/C++
318 bugs such as use-after-free and out-of-bound accesses to heap, stack, and
319 globals. The key feature of the tool is speed: the average slowdown
320 introduced by AddressSanitizer is less than 2x.</p>
321
322</div>
323
324<!--=========================================================================-->
Bill Wendling29817ea2011-10-26 00:14:36 +0000[diff] [blame]325<h3>ClamAV</h3>
326
327<div>
Bill Wendlingf2a78332011-10-25 01:01:42 +0000[diff] [blame]328
Bill Wendling29817ea2011-10-26 00:14:36 +0000[diff] [blame]329<p><a href="http://www.clamav.net">Clam AntiVirus</a> is an open source (GPL)
330 anti-virus toolkit for UNIX, designed especially for e-mail scanning on mail
331 gateways.</p>
332
333<p>Since version 0.96 it
334 has <a href="http://vrt-sourcefire.blogspot.com/2010/09/introduction-to-clamavs-low-level.html">bytecode
335 signatures</a> that allow writing detections for complex malware.</p>
336
337<p>It uses LLVM's JIT to speed up the execution of bytecode on X86, X86-64,
338 PPC32/64, falling back to its own interpreter otherwise. The git version was
339 updated to work with LLVM 3.0.</p>
340
341</div>
342
343<!--=========================================================================-->
Tobias Grosserae5a6fd2011-11-14 09:09:26 +0000[diff] [blame]344<h3>clang_complete for VIM</h3>
345
346<div>
347
348<p><a href="https://github.com/Rip-Rip/clang_complete">clang_complete</a> is a
349 VIM plugin, that provides accurate C/C++ autocompletion using the clang front
350 end. The development version of clang complete, can directly use libclang
351 which can maintain a cache to speed up auto completion.</p>
352
353</div>
354
355<!--=========================================================================-->
Bill Wendling65d1f412011-10-26 18:23:06 +0000[diff] [blame]356<h3>clReflect</h3>
357
358<div>
359
360<p><a href="https://bitbucket.org/dwilliamson/clreflect">clReflect</a> is a C++
361 parser that uses clang/LLVM to derive a light-weight reflection database
362 suitable for use in game development. It comes with a very simple runtime
363 library for loading and querying the database, requiring no external
364 dependencies (including CRT), and an additional utility library for object
365 management and serialisation.</p>
366
367</div>
368
369<!--=========================================================================-->
Bill Wendling63507d12011-10-29 01:10:01 +0000[diff] [blame]370<h3>Cling C++ Interpreter</h3>
371
372<div>
373
374<p><a href="http://cern.ch/cling">Cling</a> is an interactive compiler interface
375 (aka C++ interpreter). It uses LLVM's JIT and clang; it currently supports
376 C++ and C. It has a prompt interface, runs source files, calls into shared
377 libraries, prints the value of expressions, even does runtime lookup of
378 identifiers (dynamic scopes). And it just behaves like one would expect from
379 an interpreter.</p>
380
381</div>
382
383<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]384<h3>Crack Programming Language</h3>
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]385
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]386<div>
Bill Wendling55d6e672011-11-03 20:10:01 +0000[diff] [blame]387
388<p><a href="http://code.google.com/p/crack-language/">Crack</a> aims to provide
389 the ease of development of a scripting language with the performance of a
390 compiled language. The language derives concepts from C++, Java and Python,
391 incorporating object-oriented programming, operator overloading and strong
392 typing.</p>
393
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]394</div>
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]395
396<!--=========================================================================-->
Bill Wendlingb99486f2011-11-08 05:22:54 +0000[diff] [blame]397<h3>Eero</h3>
398
399<div>
400
401<p><a href="http://eerolanguage.org/">Eero</a> is a fully
402 header-and-binary-compatible dialect of Objective-C 2.0, implemented with a
403 patched version of the Clang/LLVM compiler. It features a streamlined syntax,
404 Python-like indentation, and new operators, for improved readability and
405 reduced code clutter. It also has new features such as limited forms of
406 operator overloading and namespaces, and strict (type-and-operator-safe)
407 enumerations. It is inspired by languages such as Smalltalk, Python, and
408 Ruby.</p>
409
410</div>
411
412<!--=========================================================================-->
Bill Wendlingf9778192011-10-26 00:09:55 +0000[diff] [blame]413<h3>Glasgow Haskell Compiler (GHC)</h3>
414
415<div>
416
417<p>GHC is an open source, state-of-the-art programming suite for Haskell, a
418 standard lazy functional programming language. It includes an optimizing
419 static compiler generating good code for a variety of platforms, together
420 with an interactive system for convenient, quick development.</p>
421
422<p>GHC 7.0 and onwards include an LLVM code generator, supporting LLVM 2.8 and
423 later. Since LLVM 2.9, GHC now includes experimental support for the ARM
424 platform with LLVM 3.0.</p>
425
426</div>
427
428<!--=========================================================================-->
Bill Wendlingf62333d2011-10-25 20:35:31 +0000[diff] [blame]429<h3>gwXscript</h3>
430
431<div>
432
433<p><a href="http://botwars.tk/gwscript/">gwXscript</a> is an object oriented,
Bill Wendling7c38de22011-10-26 04:24:15 +0000[diff] [blame]434 aspect oriented programming language which can create both executables (ELF,
Bill Wendlingf62333d2011-10-25 20:35:31 +0000[diff] [blame]435 EXE) and shared libraries (DLL, SO, DYNLIB). The compiler is implemented in
436 its own language and translates scripts into LLVM-IR which can be optimized
437 and translated into native code by the LLVM framework. Source code in
438 gwScript contains definitions that expand the namespaces. So you can build
439 your project and simply 'plug out' features by removing a file. The remaining
440 project does not leave scars since you directly separate concerns by the
441 'template' feature of gwX. It is also possible to add new features to a
442 project by just adding files and without editing the original project. This
443 language is used for example to create games or content management systems
444 that should be extendable.</p>
445
446<p>gwXscript is strongly typed and offers comfort with its native types string,
447 hash and array. You can easily write new libraries in gwXscript or native
448 code. gwXscript is type safe and users should not be able to crash your
449 program or execute malicious code except code that is eating CPU time.</p>
450
451</div>
452
453<!--=========================================================================-->
Bill Wendling50cacc82011-10-26 22:55:18 +0000[diff] [blame]454<h3>include-what-you-use</h3>
455
456<div>
457
458<p><a href="http://code.google.com/p/include-what-you-use">include-what-you-use</a>
459 is a tool to ensure that a file directly <code>#include</code>s
460 all <code>.h</code> files that provide a symbol that the file uses. It also
461 removes superfluous <code>#include</code>s from source files.</p>
462
463</div>
464
465<!--=========================================================================-->
Bill Wendling32dc4d92011-11-07 22:05:17 +0000[diff] [blame]466<h3>ispc: The Intel SPMD Program Compiler</h3>
467
468<div>
469
470<p><a href="http://ispc.github.com">ispc</a> is a compiler for "single program,
471 multiple data" (SPMD) programs. It compiles a C-based SPMD programming
472 language to run on the SIMD units of CPUs; it often delivers 5-6x speedups on
473 a single core of a CPU with an 8-wide SIMD unit compared to serial code,
474 while still providing a clean and easy-to-understand programming model. For
475 an introduction to the language and its performance,
Chris Lattnerc343e312011-11-10 20:15:40 +0000[diff] [blame]476 see <a href="http://ispc.github.com/example.html">the walkthrough</a> of a short
Bill Wendling32dc4d92011-11-07 22:05:17 +0000[diff] [blame]477 example program. ispc is licensed under the BSD license.</p>
478
479</div>
480
481<!--=========================================================================-->
Bill Wendling57fd8762011-10-26 18:20:54 +0000[diff] [blame]482<h3>LanguageKit and Pragmatic Smalltalk</h3>
483
484<div>
485
486<p><a href="http://etoileos.com/etoile/features/languagekit/">LanguageKit</a> is
487 a framework for implementing dynamic languages sharing an object model with
488 Objective-C. It provides static and JIT compilation using LLVM along with
489 its own interpreter. Pragmatic Smalltalk is a dialect of Smalltalk, built on
490 top of LanguageKit, that interfaces directly with Objective-C, sharing the
491 same object representation and message sending behaviour. These projects are
492 developed as part of the &Eacute;toi&eacute; desktop environment.</p>
493
494</div>
495
496<!--=========================================================================-->
Bill Wendling03250532011-11-01 04:08:23 +0000[diff] [blame]497<h3>LuaAV</h3>
498
499<div>
500
501<p><a href="http://lua-av.mat.ucsb.edu/blog/">LuaAV</a> is a real-time
502 audiovisual scripting environment based around the Lua language and a
503 collection of libraries for sound, graphics, and other media protocols. LuaAV
504 uses LLVM and Clang to JIT compile efficient user-defined audio synthesis
505 routines specified in a declarative syntax.</p>
506
507</div>
508
509<!--=========================================================================-->
Bill Wendlingd4821b82011-10-26 00:16:17 +0000[diff] [blame]510<h3>Mono</h3>
511
512<div>
513
514<p>An open source, cross-platform implementation of C# and the CLR that is
515 binary compatible with Microsoft.NET. Has an optional, dynamically-loaded
516 LLVM code generation backend in Mini, the JIT compiler.</p>
517
518<p>Note that we use a Git mirror of LLVM with some patches. See:
519 https://github.com/mono/llvm</p>
520
521</div>
522
523<!--=========================================================================-->
Tobias Grosser093cb7e2011-11-14 09:09:23 +0000[diff] [blame]524<h3>Polly</h3>
525
526<div>
527
528<p><a href="http://polly.grosser.es">Polly</a> is an advanced data-locality
529 optimizer and automatic parallelizer. It uses an advanced, mathematical
530 model to calculate detailed data dependency information which it uses to
531 optimize the loop structure of a program. Polly can speed up sequential code
532 by improving memory locality and consequently the cache use. Furthermore,
533 Polly is able to expose different kind of parallelism which it exploits by
534 introducing (basic) OpenMP and SIMD code. A mid-term goal of Polly is to
535 automatically create optimized GPU code.</p>
536
537</div>
538
539<!--=========================================================================-->
Bill Wendlingba226272011-10-25 20:37:45 +0000[diff] [blame]540<h3>Portable OpenCL (pocl)</h3>
541
542<div>
543
544<p>Portable OpenCL is an open source implementation of the OpenCL standard which
545 can be easily adapted for new targets. One of the goals of the project is
546 improving performance portability of OpenCL programs, avoiding the need for
547 target-dependent manual optimizations. A "native" target is included, which
548 allows running OpenCL kernels on the host (CPU).</p>
549
550</div>
551
552<!--=========================================================================-->
Bill Wendling0bad98c2011-10-25 20:39:06 +0000[diff] [blame]553<h3>Pure</h3>
554
555<div>
556<p><a href="http://pure-lang.googlecode.com/">Pure</a> is an
557 algebraic/functional programming language based on term rewriting. Programs
558 are collections of equations which are used to evaluate expressions in a
559 symbolic fashion. The interpreter uses LLVM as a backend to JIT-compile Pure
560 programs to fast native code. Pure offers dynamic typing, eager and lazy
561 evaluation, lexical closures, a hygienic macro system (also based on term
562 rewriting), built-in list and matrix support (including list and matrix
563 comprehensions) and an easy-to-use interface to C and other programming
564 languages (including the ability to load LLVM bitcode modules, and inline C,
565 C++, Fortran and Faust code in Pure programs if the corresponding LLVM-enabled
566 compilers are installed).</p>
567
568<p>Pure version 0.48 has been tested and is known to work with LLVM 3.0
569 (and continues to work with older LLVM releases &gt;= 2.5).</p>
570
571</div>
572
573<!--=========================================================================-->
Bill Wendling537d85b2011-10-26 00:12:04 +0000[diff] [blame]574<h3>Renderscript</h3>
575
576<div>
577
578<p><a href="http://developer.android.com/guide/topics/renderscript/index.html">Renderscript</a>
579 is Android's advanced 3D graphics rendering and compute API. It provides a
580 portable C99-based language with extensions to facilitate common use cases
581 for enhancing graphics and thread level parallelism. The Renderscript
582 compiler frontend is based on Clang/LLVM. It emits a portable bitcode format
583 for the actual compiled script code, as well as reflects a Java interface for
584 developers to control the execution of the compiled bitcode. Executable
585 machine code is then generated from this bitcode by an LLVM backend on the
586 device. Renderscript is thus able to provide a mechanism by which Android
587 developers can improve performance of their applications while retaining
588 portability.</p>
589
590</div>
591
592<!--=========================================================================-->
Bill Wendling7d5b6212011-10-25 20:40:26 +0000[diff] [blame]593<h3>SAFECode</h3>
594
595<div>
596
597<p><a href="http://safecode.cs.illinois.edu">SAFECode</a> is a memory safe C/C++
598 compiler built using LLVM. It takes standard, unannotated C/C++ code,
599 analyzes the code to ensure that memory accesses and array indexing
600 operations are safe, and instruments the code with run-time checks when
601 safety cannot be proven statically. SAFECode can be used as a debugging aid
602 (like Valgrind) to find and repair memory safety bugs. It can also be used
603 to protect code from security attacks at run-time.</p>
604
605</div>
606
607<!--=========================================================================-->
Bill Wendling02b77b72011-10-26 07:38:19 +0000[diff] [blame]608<h3>The Stupid D Compiler (SDC)</h3>
609
610<div>
611
612<p><a href="https://github.com/bhelyer/SDC">The Stupid D Compiler</a> is a
613 project seeking to write a self-hosting compiler for the D programming
614 language without using the frontend of the reference compiler (DMD).</p>
615
616</div>
617
618<!--=========================================================================-->
Bill Wendling2d7b4af2011-10-25 20:24:32 +0000[diff] [blame]619<h3>TTA-based Co-design Environment (TCE)</h3>
620
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]621<div>
Bill Wendling2d7b4af2011-10-25 20:24:32 +0000[diff] [blame]622
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]623<p>TCE is a toolset for designing application-specific processors (ASP) based on
Bill Wendling2d7b4af2011-10-25 20:24:32 +0000[diff] [blame]624 the Transport triggered architecture (TTA). The toolset provides a complete
625 co-design flow from C/C++ programs down to synthesizable VHDL and parallel
626 program binaries. Processor customization points include the register files,
627 function units, supported operations, and the interconnection network.</p>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]628
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]629<p>TCE uses Clang and LLVM for C/C++ language support, target independent
Bill Wendling2d7b4af2011-10-25 20:24:32 +0000[diff] [blame]630 optimizations and also for parts of code generation. It generates new
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]631 LLVM-based code generators "on the fly" for the designed TTA processors and
632 loads them in to the compiler backend as runtime libraries to avoid
Bill Wendling2d7b4af2011-10-25 20:24:32 +0000[diff] [blame]633 per-target recompilation of larger parts of the compiler chain.</p>
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]634
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]635</div>
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]636
637<!--=========================================================================-->
Bill Wendling628c2662011-10-25 20:27:37 +0000[diff] [blame]638<h3>Tart Programming Language</h3>
639
640<div>
641
642<p><a href="http://code.google.com/p/tart/">Tart</a> is a general-purpose,
643 strongly typed programming language designed for application
644 developers. Strongly inspired by Python and C#, Tart focuses on practical
645 solutions for the professional software developer, while avoiding the clutter
646 and boilerplate of legacy languages like Java and C++. Although Tart is still
647 in development, the current implementation supports many features expected of
648 a modern programming language, such as garbage collection, powerful
649 bidirectional type inference, a greatly simplified syntax for template
650 metaprogramming, closures and function literals, reflection, operator
651 overloading, explicit mutability and immutability, and much more. Tart is
652 flexible enough to accommodate a broad range of programming styles and
653 philosophies, while maintaining a strong commitment to simplicity, minimalism
654 and elegance in design.</p>
655
656</div>
657
658<!--=========================================================================-->
Bill Wendling644ce532011-10-26 09:25:01 +0000[diff] [blame]659<h3>ThreadSanitizer</h3>
660
661<div>
662
663<p><a href="http://code.google.com/p/data-race-test/">ThreadSanitizer</a> is a
664 data race detector for (mostly) C and C++ code, available for Linux, Mac OS
665 and Windows. On different systems, we use binary instrumentation frameworks
Bill Wendlingae8538e2011-10-29 01:11:15 +0000[diff] [blame]666 (Valgrind and Pin) as frontends that generate the program events for the race
667 detection algorithm. On Linux, there's an option of using LLVM-based
668 compile-time instrumentation.</p>
Bill Wendling644ce532011-10-26 09:25:01 +0000[diff] [blame]669
670</div>
671
672<!--=========================================================================-->
Bill Wendling8a924c62011-10-26 07:42:45 +0000[diff] [blame]673<h3>The ZooLib C++ Cross-Platform Application Framework</h3>
674
675<div>
676
677<p><a href="http://www.zoolib.org/">ZooLib</a> is Open Source under the MIT
678 License. It provides GUI, filesystem access, TCP networking, thread-safe
679 memory management, threading and locking for Mac OS X, Classic Mac OS,
680 Microsoft Windows, POSIX operating systems with X11, BeOS, Haiku, Apple's iOS
681 and Research in Motion's BlackBerry.</p>
682
683<p>My current work is to use CLang's static analyzer to improve ZooLib's code
684 quality. I also plan to set up LLVM compiles of the demo programs and test
685 programs using CLang and LLVM on all the platforms that CLang, LLVM and
686 ZooLib all support.</p>
687
688</div>
Chris Lattnera844a3e2011-04-07 03:09:21 +0000[diff] [blame]689
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]690</div>
691
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]692<!-- *********************************************************************** -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]693<h2>
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]694 <a name="whatsnew">What's New in LLVM 3.0?</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]695</h2>
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]696<!-- *********************************************************************** -->
697
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]698<div>
Chris Lattnerf8e0b4e2008-06-08 22:59:35 +0000[diff] [blame]699
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]700<p>This release includes a huge number of bug fixes, performance tweaks and
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]701 minor improvements. Some of the major improvements and new features are
702 listed in this section.</p>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]703
Chris Lattner914ce462010-04-22 06:28:20 +0000[diff] [blame]704<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]705<h3>
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]706<a name="majorfeatures">Major New Features</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]707</h3>
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]708
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]709<div>
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]710
Chris Lattnerc343e312011-11-10 20:15:40 +0000[diff] [blame]711<p><b>llvm-gcc is gone</b></p>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]712
Chris Lattnerc343e312011-11-10 20:15:40 +0000[diff] [blame]713<p>LLVM 3.0 includes several major new capabilities:</p>
714
Chris Lattnerdec23b62011-11-15 22:13:27 +0000[diff] [blame]715<!-- Near dead:
716 Analysis/RegionInfo.h + Dom Frontiers
717 SparseBitVector: used in LiveVar.
718
719 -->
720
721<!--
722 Type system rewrite.
723 Better performance for Neon code in clang due to SRoA improvements.
724 New regalloc on by default. Lin scan going away in 3.1
725 PGO / builtin_expect improvements (summary needed)
726 Big EH rewrite.
727 AVX support, assembler, compiler and disassembler.
728 IndVar improvements: andy
729 PTX backend improvements: Justin
730 llvm-rtdyld & MC JIT: JimG
731 InstAliases now automatically used in the asmprinter where they are shorter.
732 Integrated assembler on by default for arm/thumb?
733 PostOrder Dominator frontiers were removed.
734 Line Profiling / gcov support
735 EH and debug information produced with CFI directives, yielding smaller executables: http://blog.mozilla.com/respindola/2011/05/12/cfi-directives/
736 X86-64 generates smaller and faster code at -O0 (fast isel improvements)
737 Better code generation for Cortex-A9
738 Many APIs take ArrayRef's now.
739 Pass manager extension API.
740
741 -->
742
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]743<ul>
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]744
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]745<!--
746<li></li>
747-->
Chris Lattner7a8e6c52011-04-05 18:38:45 +0000[diff] [blame]748
Chris Lattner8170c102008-02-10 08:18:42 +0000[diff] [blame]749</ul>
Chris Lattner0a6f6d52011-04-05 07:19:28 +0000[diff] [blame]750
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]751</div>
752
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]753<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]754<h3>
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]755<a name="coreimprovements">LLVM IR and Core Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]756</h3>
Chris Lattnerf304ffc2008-02-10 08:17:19 +0000[diff] [blame]757
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]758<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]759
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]760<p>LLVM IR has several new features for better support of new targets and that
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]761 expose new optimization opportunities:</p>
Chris Lattnerf304ffc2008-02-10 08:17:19 +0000[diff] [blame]762
Bill Wendlingbc5f6dd2011-10-26 18:33:01 +0000[diff] [blame]763<p>One of the biggest changes is that 3.0 has a new exception handling
764 system. The old system used LLVM intrinsics to convey the exception handling
765 information to the code generator. It worked in most cases, but not
766 all. Inlining was especially difficult to get right. Also, the intrinsics
767 could be moved away from the <code>invoke</code> instruction, making it hard
768 to recover that information.</p>
769
770<p>The new EH system makes exception handling a first-class member of the IR. It
771 adds two new instructions:</p>
772
Chris Lattner791f77b2008-06-05 06:25:56 +0000[diff] [blame]773<ul>
Bill Wendlingbc5f6dd2011-10-26 18:33:01 +0000[diff] [blame]774 <li><a href="LangRef.html#i_landingpad"><code>landingpad</code></a> &mdash;
775 this instruction defines a landing pad basic block. It contains all of the
776 information that's needed by the code generator. It's also required to be
777 the first non-PHI instruction in the landing pad. In addition, a landing
778 pad may be jumped to only by the unwind edge of an <code>invoke</code>
779 instruction.</li>
780
781 <li><a href="LangRef.html#i_resume"><code>resume</code></a> &mdash; this
782 instruction causes the current exception to resume traveling up the
783 stack. It replaces the <code>@llvm.eh.resume</code> intrinsic.</li>
Chris Lattnerf304ffc2008-02-10 08:17:19 +0000[diff] [blame]784</ul>
Mikhail Glushenkovea65d7d2008-10-13 02:08:34 +0000[diff] [blame]785
Bill Wendlingbc5f6dd2011-10-26 18:33:01 +0000[diff] [blame]786<p>Converting from the old EH API to the new EH API is rather simple, because a
787 lot of complexity has been removed. The two intrinsics,
788 <code>@llvm.eh.exception</code> and <code>@llvm.eh.selector</code> have been
789 superceded by the <code>landingpad</code> instruction. Instead of generating
790 a call to <code>@llvm.eh.exception</code> and <code>@llvm.eh.selector</code>:
791
792<div class="doc_code">
793<pre>
794Function *ExcIntr = Intrinsic::getDeclaration(TheModule,
795 Intrinsic::eh_exception);
796Function *SlctrIntr = Intrinsic::getDeclaration(TheModule,
797 Intrinsic::eh_selector);
798
799// The exception pointer.
800Value *ExnPtr = Builder.CreateCall(ExcIntr, "exc_ptr");
801
802std::vector&lt;Value*&gt; Args;
803Args.push_back(ExnPtr);
804Args.push_back(Builder.CreateBitCast(Personality,
805 Type::getInt8PtrTy(Context)));
806
807<i>// Add selector clauses to Args.</i>
808
809// The selector call.
810Builder.CreateCall(SlctrIntr, Args, "exc_sel");
811</pre>
812</div>
813
814<p>You should instead generate a <code>landingpad</code> instruction, that
815 returns an exception object and selector value:</p>
816
817<div class="doc_code">
818<pre>
819LandingPadInst *LPadInst =
820 Builder.CreateLandingPad(StructType::get(Int8PtrTy, Int32Ty, NULL),
821 Personality, 0);
822
823Value *LPadExn = Builder.CreateExtractValue(LPadInst, 0);
824Builder.CreateStore(LPadExn, getExceptionSlot());
825
826Value *LPadSel = Builder.CreateExtractValue(LPadInst, 1);
827Builder.CreateStore(LPadSel, getEHSelectorSlot());
828</pre>
829</div>
830
831<p>It's now trivial to add the individual clauses to the <code>landingpad</code>
832 instruction.</p>
833
834<div class="doc_code">
835<pre>
836<i><b>// Adding a catch clause</b></i>
837Constant *TypeInfo = getTypeInfo();
838LPadInst-&gt;addClause(TypeInfo);
839
840<i><b>// Adding a C++ catch-all</b></i>
841LPadInst-&gt;addClause(Constant::getNullValue(Builder.getInt8PtrTy()));
842
843<i><b>// Adding a cleanup</b></i>
844LPadInst-&gt;setCleanup(true);
845
846<i><b>// Adding a filter clause</b></i>
847std::vector&lt;Constant*&gt; TypeInfos;
848Constant *TypeInfo = getFilterTypeInfo();
849TypeInfos.push_back(Builder.CreateBitCast(TypeInfo, Builder.getInt8PtrTy()));
850
851ArrayType *FilterTy = ArrayType::get(Int8PtrTy, TypeInfos.size());
852LPadInst-&gt;addClause(ConstantArray::get(FilterTy, TypeInfos));
853</pre>
854</div>
855
856<p>Converting from using the <code>@llvm.eh.resume</code> intrinsic to
857 the <code>resume</code> instruction is trivial. It takes the exception
858 pointer and exception selector values returned by
859 the <code>landingpad</code> instruction:</p>
860
861<div class="doc_code">
862<pre>
863Type *UnwindDataTy = StructType::get(Builder.getInt8PtrTy(),
864 Builder.getInt32Ty(), NULL);
865Value *UnwindData = UndefValue::get(UnwindDataTy);
866Value *ExcPtr = Builder.CreateLoad(getExceptionObjSlot());
867Value *ExcSel = Builder.CreateLoad(getExceptionSelSlot());
868UnwindData = Builder.CreateInsertValue(UnwindData, ExcPtr, 0, "exc_ptr");
869UnwindData = Builder.CreateInsertValue(UnwindData, ExcSel, 1, "exc_sel");
870Builder.CreateResume(UnwindData);
871</pre>
872</div>
873
Chris Lattnerf304ffc2008-02-10 08:17:19 +0000[diff] [blame]874</div>
875
876<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]877<h3>
Andrew Trick5aab6382011-11-06 17:59:24 +0000[diff] [blame]878<a name="loopoptimization">Loop Optimization Improvements</a>
879</h3>
880
881<div>
882<p>The induction variable simplification pass in 3.0 only modifies
883 induction variables when profitable. Sign and zero extension
884 elimination, linear function test replacement, loop unrolling, and
885 other simplifications that require induction variable analysis have
886 been generalized so they no longer require loops to be rewritten in a
887 typically suboptimal form prior to optimization. This new design
888 preserves more IR level information, avoids undoing earlier loop
889 optimizations (particularly hand-optimized loops), and no longer
890 strongly depends on the code generator rewriting loops a second time
891 in a now optimal form--an intractable problem.</p>
892
893<p>The original behavior can be restored with -mllvm -enable-iv-rewrite;
894 however, support for this mode will be short lived. As such, bug
895 reports should be filed for any significant performance regressions
896 when moving from -mllvm -enable-iv-rewrite to the 3.0 default mode.</p>
897</div>
898
899<!--=========================================================================-->
900<h3>
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]901<a name="optimizer">Optimizer Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]902</h3>
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]903
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]904<div>
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]905
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]906<p>In addition to a large array of minor performance tweaks and bug fixes, this
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]907 release includes a few major enhancements and additions to the
908 optimizers:</p>
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]909
910<ul>
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]911<!--
912<li></li>
913-->
Chris Lattnerc5ac61d2011-04-06 05:50:04 +0000[diff] [blame]914</li>
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]915
Chris Lattner11b66112010-10-04 02:42:39 +0000[diff] [blame]916</ul>
917
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]918</div>
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]919
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]920<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]921<h3>
Chris Lattner4ba2b652010-09-30 16:31:33 +0000[diff] [blame]922<a name="mc">MC Level Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]923</h3>
Chris Lattner4ba2b652010-09-30 16:31:33 +0000[diff] [blame]924
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]925<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]926
927<p>The LLVM Machine Code (aka MC) subsystem was created to solve a number of
928 problems in the realm of assembly, disassembly, object file format handling,
929 and a number of other related areas that CPU instruction-set level tools work
930 in.</p>
Chris Lattner7d9b6b42010-10-02 21:59:30 +0000[diff] [blame]931
Chris Lattner7d9b6b42010-10-02 21:59:30 +0000[diff] [blame]932<ul>
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]933<!--
934<li></li>
935-->
Chris Lattner7d9b6b42010-10-02 21:59:30 +0000[diff] [blame]936</ul>
937
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]938<p>For more information, please see
939 the <a href="http://blog.llvm.org/2010/04/intro-to-llvm-mc-project.html">Intro
940 to the LLVM MC Project Blog Post</a>.</p>
Chris Lattner4ba2b652010-09-30 16:31:33 +0000[diff] [blame]941
NAKAMURA Takumi45c435a2011-04-05 08:24:22 +0000[diff] [blame]942</div>
Chris Lattner4ba2b652010-09-30 16:31:33 +0000[diff] [blame]943
Chris Lattner4ba2b652010-09-30 16:31:33 +0000[diff] [blame]944<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]945<h3>
Chris Lattner511433e2009-03-02 03:24:11 +0000[diff] [blame]946<a name="codegen">Target Independent Code Generator Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]947</h3>
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]948
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]949<div>
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]950
Mikhail Glushenkovf795ef02009-03-01 18:09:47 +0000[diff] [blame]951<p>We have put a significant amount of work into the code generator
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]952 infrastructure, which allows us to implement more aggressive algorithms and
953 make it run faster:</p>
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]954
955<ul>
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]956<!--
957<li></li>
958-->
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]959</ul>
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]960</div>
961
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]962<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]963<h3>
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]964<a name="x86">X86-32 and X86-64 Target Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]965</h3>
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]966
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]967<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]968
969<p>New features and major changes in the X86 target include:</p>
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]970
971<ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]972
973 <li>The CRC32 intrinsics have been renamed. The intrinsics were previously
974 <code>@llvm.x86.sse42.crc32.[8|16|32]</code>
975 and <code>@llvm.x86.sse42.crc64.[8|64]</code>. They have been renamed to
976 <code>@llvm.x86.sse42.crc32.32.[8|16|32]</code> and
977 <code>@llvm.x86.sse42.crc32.64.[8|64]</code>.</li>
Chad Rosierf94c9c12011-05-27 20:13:10 +0000[diff] [blame]978
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]979</ul>
980
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]981</div>
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]982
983<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]984<h3>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]985<a name="ARM">ARM Target Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]986</h3>
Chris Lattnerc441fb82009-03-01 02:30:21 +0000[diff] [blame]987
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]988<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]989
990<p>New features of the ARM target include:</p>
Chris Lattnerc441fb82009-03-01 02:30:21 +0000[diff] [blame]991
992<ul>
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]993<!--
994<li></li>
995-->
Bob Wilsone8472772010-09-13 17:39:35 +0000[diff] [blame]996</ul>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]997</div>
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]998
999<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1000<h3>
Akira Hatanaka5381cbf2011-11-15 21:33:05 +0000[diff] [blame]1001<a name="MIPS">MIPS Target Improvements</a>
1002</h3>
1003
1004<div>
1005
1006<p>New features and major changes in the MIPS target include:</p>
1007
1008<ul>
1009 <li>Most MIPS32r1 and r2 instructions are now supported.</li>
1010 <li>LE/BE MIPS32r1/r2 has been tested extensively.</li>
1011 <li>O32 ABI has been fully tested.</li>
1012 <li>MIPS backend has migrated to using the MC infrastructure for assembly printing. Initial support for direct object code emission has been implemented too.</li>
1013 <li>Delay slot filler has been updated. Now it tries to fill delay slots with useful instructions instead of always filling them with NOPs.</li>
1014 <li>Support for old-style JIT is complete.</li>
1015 <li>Support for old architectures (MIPS1 and MIPS2) has been removed.</li>
1016 <li>Initial support for MIPS64 has been added.</li>
1017</ul>
1018</div>
1019
1020<!--=========================================================================-->
1021<h3>
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]1022<a name="OtherTS">Other Target Specific Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1023</h3>
Chris Lattnerc441fb82009-03-01 02:30:21 +0000[diff] [blame]1024
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1025<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1026
Chris Lattnerc343e312011-11-10 20:15:40 +0000[diff] [blame]1027 <p>PPC32/ELF va_arg was implemented.</p>
1028 <p>PPC32 initial support for .o file writing was implemented.</p>
Wesley Peck3ff16db2011-11-14 18:56:41 +0000[diff] [blame]1029 <p>MicroBlaze scheduling itineraries were added that model the
1030 3-stage and the 5-stage pipeline architectures. The 3-stage
1031 pipeline model can be selected with <code>-mcpu=mblaze3</code>
1032 and the 5-stage pipeline model can be selected with
1033 <code>-mcpu=mblaze5</code>.</p>
Chris Lattnerc343e312011-11-10 20:15:40 +0000[diff] [blame]1034
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]1035<ul>
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]1036<!--
1037<li></li>
1038-->
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]1039</ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1040
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]1041</div>
Chris Lattner77d29b12008-06-05 08:02:49 +0000[diff] [blame]1042
1043<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1044<h3>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]1045<a name="changes">Major Changes and Removed Features</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1046</h3>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]1047
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1048<div>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]1049
Bill Wendling2626dba2011-08-03 22:18:20 +0000[diff] [blame]1050<p>If you're already an LLVM user or developer with out-of-tree changes based on
1051 LLVM 2.9, this section lists some "gotchas" that you may run into upgrading
1052 from the previous release.</p>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]1053
1054<ul>
Eric Christopher90d6ec52011-09-28 19:47:28 +0000[diff] [blame]1055 <li>The <code>LLVMC</code> front end code was removed while separating
1056 out language independence.</li>
Jay Foadf42e9b22011-08-04 10:43:43 +0000[diff] [blame]1057 <li>The <code>LowerSetJmp</code> pass wasn't used effectively by any
1058 target and has been removed.</li>
Rafael Espindolaf940a1a2011-08-30 23:03:45 +0000[diff] [blame]1059 <li>The old <code>TailDup</code> pass was not used in the standard pipeline
1060 and was unable to update ssa form, so it has been removed.
Eli Friedmanf03bb262011-08-12 22:50:01 +0000[diff] [blame]1061 <li>The syntax of volatile loads and stores in IR has been changed to
1062 "<code>load volatile</code>"/"<code>store volatile</code>". The old
1063 syntax ("<code>volatile load</code>"/"<code>volatile store</code>")
1064 is still accepted, but is now considered deprecated.</li>
Eli Friedman526e1bb2011-10-26 00:55:23 +0000[diff] [blame]1065 <li>The old atomic intrinscs (<code>llvm.memory.barrier</code> and
1066 <code>llvm.atomic.*</code>) are now gone. Please use the new atomic
1067 instructions, described in the <a href="Atomics.html">atomics guide</a>.
Devang Patelb34dd132008-10-14 20:03:43 +0000[diff] [blame]1068</ul>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]1069
NAKAMURA Takumi2026de22011-08-22 23:22:05 +0000[diff] [blame]1070<h4>Windows (32-bit)</h4>
1071<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1072
NAKAMURA Takumi2026de22011-08-22 23:22:05 +0000[diff] [blame]1073<ul>
1074 <li>On Win32(MinGW32 and MSVC), Windows 2000 will not be supported.
1075 Windows XP or higher is required.</li>
1076</ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1077
NAKAMURA Takumi2026de22011-08-22 23:22:05 +0000[diff] [blame]1078</div>
1079
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]1080</div>
1081
Daniel Dunbarf0233c62010-10-04 20:11:41 +0000[diff] [blame]1082<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1083<h3>
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]1084<a name="api_changes">Internal API Changes</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1085</h3>
Daniel Dunbarf0233c62010-10-04 20:11:41 +0000[diff] [blame]1086
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1087<div>
Daniel Dunbarf0233c62010-10-04 20:11:41 +0000[diff] [blame]1088
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]1089<p>In addition, many APIs have changed in this release. Some of the major
Bill Wendling16005252011-08-02 06:20:17 +0000[diff] [blame]1090 LLVM API changes are:</p>
Daniel Dunbarf0233c62010-10-04 20:11:41 +0000[diff] [blame]1091
1092<ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1093 <li>The biggest and most pervasive change is that llvm::Type's are no longer
1094 returned or accepted as 'const' values. Instead, just pass around
1095 non-const Type's.</li>
Chris Lattnerd1324302011-07-18 04:56:02 +0000[diff] [blame]1096
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1097 <li><code>PHINode::reserveOperandSpace</code> has been removed. Instead, you
1098 must specify how many operands to reserve space for when you create the
1099 PHINode, by passing an extra argument
1100 into <code>PHINode::Create</code>.</li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]1101
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1102 <li>PHINodes no longer store their incoming BasicBlocks as operands. Instead,
1103 the list of incoming BasicBlocks is stored separately, and can be accessed
1104 with new functions <code>PHINode::block_begin</code>
1105 and <code>PHINode::block_end</code>.</li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]1106
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1107 <li>Various functions now take an <code>ArrayRef</code> instead of either a
1108 pair of pointers (or iterators) to the beginning and end of a range, or a
1109 pointer and a length. Others now return an <code>ArrayRef</code> instead
1110 of a reference to a <code>SmallVector</code>
1111 or <code>std::vector</code>. These include:
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]1112<ul>
1113<!-- Please keep this list sorted. -->
Jay Foada3efbb12011-07-15 08:37:34 +0000[diff] [blame]1114<li><code>CallInst::Create</code></li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]1115<li><code>ComputeLinearIndex</code> (in <code>llvm/CodeGen/Analysis.h</code>)</li>
1116<li><code>ConstantArray::get</code></li>
1117<li><code>ConstantExpr::getExtractElement</code></li>
Jay Foaddab3d292011-07-21 14:31:17 +0000[diff] [blame]1118<li><code>ConstantExpr::getGetElementPtr</code></li>
1119<li><code>ConstantExpr::getInBoundsGetElementPtr</code></li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]1120<li><code>ConstantExpr::getIndices</code></li>
1121<li><code>ConstantExpr::getInsertElement</code></li>
1122<li><code>ConstantExpr::getWithOperands</code></li>
Jay Foad1d2f5692011-07-19 13:32:40 +0000[diff] [blame]1123<li><code>ConstantFoldCall</code> (in <code>llvm/Analysis/ConstantFolding.h</code>)</li>
1124<li><code>ConstantFoldInstOperands</code> (in <code>llvm/Analysis/ConstantFolding.h</code>)</li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]1125<li><code>ConstantVector::get</code></li>
1126<li><code>DIBuilder::createComplexVariable</code></li>
1127<li><code>DIBuilder::getOrCreateArray</code></li>
1128<li><code>ExtractValueInst::Create</code></li>
1129<li><code>ExtractValueInst::getIndexedType</code></li>
1130<li><code>ExtractValueInst::getIndices</code></li>
1131<li><code>FindInsertedValue</code> (in <code>llvm/Analysis/ValueTracking.h</code>)</li>
Jay Foadca12a212011-07-19 14:42:50 +0000[diff] [blame]1132<li><code>gep_type_begin</code> (in <code>llvm/Support/GetElementPtrTypeIterator.h</code>)</li>
1133<li><code>gep_type_end</code> (in <code>llvm/Support/GetElementPtrTypeIterator.h</code>)</li>
Jay Foada9203102011-07-25 09:48:08 +0000[diff] [blame]1134<li><code>GetElementPtrInst::Create</code></li>
1135<li><code>GetElementPtrInst::CreateInBounds</code></li>
1136<li><code>GetElementPtrInst::getIndexedType</code></li>
Jay Foadb60e8512011-07-21 14:42:51 +0000[diff] [blame]1137<li><code>InsertValueInst::Create</code></li>
1138<li><code>InsertValueInst::getIndices</code></li>
1139<li><code>InvokeInst::Create</code></li>
Jay Foada3efbb12011-07-15 08:37:34 +0000[diff] [blame]1140<li><code>IRBuilder::CreateCall</code></li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]1141<li><code>IRBuilder::CreateExtractValue</code></li>
Jay Foad0a2a60a2011-07-22 08:16:57 +0000[diff] [blame]1142<li><code>IRBuilder::CreateGEP</code></li>
1143<li><code>IRBuilder::CreateInBoundsGEP</code></li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]1144<li><code>IRBuilder::CreateInsertValue</code></li>
Jay Foada3efbb12011-07-15 08:37:34 +0000[diff] [blame]1145<li><code>IRBuilder::CreateInvoke</code></li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]1146<li><code>MDNode::get</code></li>
1147<li><code>MDNode::getIfExists</code></li>
1148<li><code>MDNode::getTemporary</code></li>
1149<li><code>MDNode::getWhenValsUnresolved</code></li>
Jay Foadb9b54eb2011-07-19 15:07:52 +0000[diff] [blame]1150<li><code>SimplifyGEPInst</code> (in <code>llvm/Analysis/InstructionSimplify.h</code>)</li>
Jay Foad8fbbb392011-07-19 14:01:37 +0000[diff] [blame]1151<li><code>TargetData::getIndexedOffset</code></li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]1152</ul></li>
1153
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1154 <li>All forms of <code>StringMap::getOrCreateValue</code> have been remove
1155 except for the one which takes a <code>StringRef</code>.</li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]1156
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1157 <li>The <code>LLVMBuildUnwind</code> function from the C API was removed. The
1158 LLVM <code>unwind</code> instruction has been deprecated for a long time
1159 and isn't used by the current front-ends. So this was removed during the
1160 exception handling rewrite.</li>
Bill Wendling16005252011-08-02 06:20:17 +0000[diff] [blame]1161
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1162 <li>The <code>LLVMAddLowerSetJmpPass</code> function from the C API was
1163 removed because the <code>LowerSetJmp</code> pass was removed.</li>
Bill Wendling2626dba2011-08-03 22:18:20 +0000[diff] [blame]1164
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1165 <li>The <code>DIBuilder</code> interface used by front ends to encode
1166 debugging information in the LLVM IR now expects clients to
1167 use <code>DIBuilder::finalize()</code> at the end of translation unit to
1168 complete debugging information encoding.</li>
Devang Patel6326a422011-08-15 23:00:00 +0000[diff] [blame]1169
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1170 <li>The way the type system works has been
1171 rewritten: <code>PATypeHolder</code> and <code>OpaqueType</code> are gone,
1172 and all APIs deal with <code>Type*</code> instead of <code>const
1173 Type*</code>. If you need to create recursive structures, then create a
1174 named structure, and use <code>setBody()</code> when all its elements are
1175 built. Type merging and refining is gone too: named structures are not
1176 merged with other structures, even if their layout is identical. (of
1177 course anonymous structures are still uniqued by layout).</li>
Torok Edwinf16e2d42011-09-30 13:07:52 +0000[diff] [blame]1178
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1179 <li>TargetSelect.h moved to Support/ from Target/</li>
Torok Edwinf16e2d42011-09-30 13:07:52 +0000[diff] [blame]1180
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1181 <li>UpgradeIntrinsicCall no longer upgrades pre-2.9 intrinsic calls (for
1182 example <code>llvm.memset.i32</code>).</li>
Torok Edwinf16e2d42011-09-30 13:07:52 +0000[diff] [blame]1183
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1184 <li>It is mandatory to initialize all out-of-tree passes too and their dependencies now with
1185 <code>INITIALIZE_PASS{BEGIN,END,}</code>
1186 and <code>INITIALIZE_{PASS,AG}_DEPENDENCY</code>.</li>
Torok Edwinf16e2d42011-09-30 13:07:52 +0000[diff] [blame]1187
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1188 <li>The interface for MemDepResult in MemoryDependenceAnalysis has been
1189 enhanced with new return types Unknown and NonFuncLocal, in addition to
1190 the existing types Clobber, Def, and NonLocal.</li>
Daniel Dunbarf0233c62010-10-04 20:11:41 +0000[diff] [blame]1191</ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1192
Daniel Dunbarf0233c62010-10-04 20:11:41 +0000[diff] [blame]1193</div>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]1194
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1195</div>
1196
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1197<!-- *********************************************************************** -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1198<h2>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1199 <a name="knownproblems">Known Problems</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1200</h2>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1201<!-- *********************************************************************** -->
1202
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1203<div>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1204
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1205<p>This section contains significant known problems with the LLVM system, listed
1206 by component. If you run into a problem, please check
1207 the <a href="http://llvm.org/bugs/">LLVM bug database</a> and submit a bug if
1208 there isn't already one.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1209
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]1210<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1211<h3>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]1212 <a name="experimental">Experimental features included with this release</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1213</h3>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1214
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1215<div>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]1216
Misha Brukman6df9e2c2004-05-12 21:46:05 +0000[diff] [blame]1217<p>The following components of this LLVM release are either untested, known to
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1218 be broken or unreliable, or are in early development. These components
1219 should not be relied on, and bugs should not be filed against them, but they
1220 may be useful to some people. In particular, if you would like to work on
1221 one of these components, please contact us on
1222 the <a href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVMdev
1223 list</a>.</p>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]1224
1225<ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1226 <li>The Alpha, Blackfin, CellSPU, MicroBlaze, MSP430, MIPS, PTX, SystemZ and
1227 XCore backends are experimental.</li>
1228
1229 <li><tt>llc</tt> "<tt>-filetype=obj</tt>" is experimental on all targets other
1230 than darwin and ELF X86 systems.</li>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]1231</ul>
1232
1233</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1234
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1235<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1236<h3>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1237 <a name="x86-be">Known problems with the X86 back-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1238</h3>
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]1239
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1240<div>
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]1241
1242<ul>
Anton Korobeynikova6094be2008-06-08 10:24:13 +0000[diff] [blame]1243 <li>The X86 backend does not yet support
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1244 all <a href="http://llvm.org/PR879">inline assembly that uses the X86
1245 floating point stack</a>. It supports the 'f' and 't' constraints, but
1246 not 'u'.</li>
1247
Dan Gohman8207ba92008-06-08 23:05:11 +0000[diff] [blame]1248 <li>The X86-64 backend does not yet support the LLVM IR instruction
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1249 <tt>va_arg</tt>. Currently, front-ends support variadic argument
1250 constructs on X86-64 by lowering them manually.</li>
1251
NAKAMURA Takumi45c435a2011-04-05 08:24:22 +0000[diff] [blame]1252 <li>Windows x64 (aka Win64) code generator has a few issues.
1253 <ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1254 <li>On mingw-w64, you will see unresolved symbol <tt>__chkstk</tt> due
1255 to <a href="http://llvm.org/bugs/show_bug.cgi?id=8919">Bug 8919</a>.
1256 It is fixed
1257 in <a href="http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20110321/118499.html">r128206</a>.</li>
1258
NAKAMURA Takumi45c435a2011-04-05 08:24:22 +0000[diff] [blame]1259 <li>Miss-aligned MOVDQA might crash your program. It is due to
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1260 <a href="http://llvm.org/bugs/show_bug.cgi?id=9483">Bug 9483</a>, lack
1261 of handling aligned internal globals.</li>
NAKAMURA Takumi45c435a2011-04-05 08:24:22 +0000[diff] [blame]1262 </ul>
1263 </li>
1264
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1265</ul>
1266
1267</div>
1268
1269<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1270<h3>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1271 <a name="ppc-be">Known problems with the PowerPC back-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1272</h3>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1273
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1274<div>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1275
1276<ul>
Roman Divacky223764c2011-10-30 07:49:04 +0000[diff] [blame]1277 <li>The PPC32/ELF support lacks PIC support.</li>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1278</ul>
1279
1280</div>
1281
1282<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1283<h3>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]1284 <a name="arm-be">Known problems with the ARM back-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1285</h3>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]1286
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1287<div>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]1288
1289<ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1290 <li>Thumb mode works only on ARMv6 or higher processors. On sub-ARMv6
1291 processors, thumb programs can crash or produce wrong results
1292 (<a href="http://llvm.org/PR1388">PR1388</a>).</li>
1293
1294 <li>Compilation for ARM Linux OABI (old ABI) is supported but not fully
1295 tested.</li>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]1296</ul>
1297
1298</div>
1299
1300<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1301<h3>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1302 <a name="sparc-be">Known problems with the SPARC back-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1303</h3>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1304
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1305<div>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1306
1307<ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1308 <li>The SPARC backend only supports the 32-bit SPARC ABI (-m32); it does not
1309 support the 64-bit SPARC ABI (-m64).</li>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1310</ul>
1311
1312</div>
1313
1314<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1315<h3>
Bruno Cardoso Lopesb7e1a4f2008-10-25 14:56:26 +0000[diff] [blame]1316 <a name="mips-be">Known problems with the MIPS back-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1317</h3>
Bruno Cardoso Lopesb7e1a4f2008-10-25 14:56:26 +0000[diff] [blame]1318
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1319<div>
Bruno Cardoso Lopesb7e1a4f2008-10-25 14:56:26 +0000[diff] [blame]1320
1321<ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1322 <li>64-bit MIPS targets are not supported yet.</li>
Bruno Cardoso Lopesb7e1a4f2008-10-25 14:56:26 +0000[diff] [blame]1323</ul>
1324
1325</div>
1326
1327<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1328<h3>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1329 <a name="alpha-be">Known problems with the Alpha back-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1330</h3>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1331
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1332<div>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1333
1334<ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1335 <li>On 21164s, some rare FP arithmetic sequences which may trap do not have
1336 the appropriate nops inserted to ensure restartability.</li>
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]1337</ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1338
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]1339</div>
1340
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1341<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1342<h3>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]1343 <a name="c-be">Known problems with the C back-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1344</h3>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1345
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1346<div>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1347
Chris Lattner3016ee92010-09-29 05:34:42 +0000[diff] [blame]1348<p>The C backend has numerous problems and is not being actively maintained.
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1349 Depending on it for anything serious is not advised.</p>
Chris Lattner3016ee92010-09-29 05:34:42 +0000[diff] [blame]1350
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1351<ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1352 <li><a href="http://llvm.org/PR802">The C backend has only basic support for
1353 inline assembly code</a>.</li>
1354
1355 <li><a href="http://llvm.org/PR1658">The C backend violates the ABI of common
1356 C++ programs</a>, preventing intermixing between C++ compiled by the CBE
1357 and C++ code compiled with <tt>llc</tt> or native compilers.</li>
1358
1359 <li>The C backend does not support all exception handling constructs.</li>
1360
1361 <li>The C backend does not support arbitrary precision integers.</li>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1362</ul>
1363
1364</div>
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]1365
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1366</div>
1367
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1368<!-- *********************************************************************** -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1369<h2>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1370 <a name="additionalinfo">Additional Information</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1371</h2>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1372<!-- *********************************************************************** -->
1373
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1374<div>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1375
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1376<p>A wide variety of additional information is available on
1377 the <a href="http://llvm.org/">LLVM web page</a>, in particular in
1378 the <a href="http://llvm.org/docs/">documentation</a> section. The web page
1379 also contains versions of the API documentation which is up-to-date with the
1380 Subversion version of the source code. You can access versions of these
1381 documents specific to this release by going into the "<tt>llvm/doc/</tt>"
1382 directory in the LLVM tree.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1383
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1384<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]1385 us via the <a href="http://llvm.org/docs/#maillist"> mailing lists</a>.</p>
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