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gerrit-public.fairphone.software / toolchain / llvm-project / e5b37be30a188d2b4ee35d1eb410f29e6d275780 / . / llvm / docs / ReleaseNotes.html
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Chad Rosier06da55e2011-05-27 22:50:46 +0000[diff] [blame]7 <title>LLVM 3.0 Release Notes</title>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]8</head>
9<body>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]10
Chad Rosier06da55e2011-05-27 22:50:46 +0000[diff] [blame]11<h1>LLVM 3.0 Release Notes</h1>
Mikhail Glushenkov024f7cf2008-10-13 02:08:34 +0000[diff] [blame]12
Chris Lattnerc871bac2010-03-17 04:02:39 +0000[diff] [blame]13<img align=right src="http://llvm.org/img/DragonSmall.png"
Gabor Greif27b166352010-04-22 10:21:43 +0000[diff] [blame]14 width="136" height="136" alt="LLVM Dragon Logo">
Chris Lattnerc871bac2010-03-17 04:02:39 +0000[diff] [blame]15
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]16<ol>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]17 <li><a href="#intro">Introduction</a></li>
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]18 <li><a href="#subproj">Sub-project Status Update</a></li>
Chad Rosier06da55e2011-05-27 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 Lattner77a51732004-04-30 22:17:12 +0000[diff] [blame]21 <li><a href="GettingStarted.html">Installation Instructions</a></li>
Dan Gohmanad888912008-10-14 16:23:02 +0000[diff] [blame]22 <li><a href="#knownproblems">Known Problems</a></li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]23 <li><a href="#additionalinfo">Additional Information</a></li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]24</ol>
25
Chris Lattner020e1fc2004-05-23 21:07:27 +0000[diff] [blame]26<div class="doc_author">
NAKAMURA Takumica46f5a2011-04-09 02:13:37 +0000[diff] [blame]27 <p>Written by the <a href="http://llvm.org/">LLVM Team</a></p>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]28</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]29
Chris Lattner17c170a2011-04-06 06:29:50 +0000[diff] [blame]30<!--
Chad Rosier06da55e2011-05-27 22:50:46 +0000[diff] [blame]31<h1 style="color:red">These are in-progress notes for the upcoming LLVM 3.0
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]32release.<br>
33You may prefer the
Chad Rosier06da55e2011-05-27 22:50:46 +0000[diff] [blame]34<a href="http://llvm.org/releases/2.9/docs/ReleaseNotes.html">LLVM 2.9
Dan Gohman62af9d22010-05-03 23:51:05 +0000[diff] [blame]35Release Notes</a>.</h1>
Chris Lattner17c170a2011-04-06 06:29:50 +0000[diff] [blame]36 -->
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]37
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]38<!-- *********************************************************************** -->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]39<h2>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]40 <a name="intro">Introduction</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]41</h2>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]42<!-- *********************************************************************** -->
43
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]44<div>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]45
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]46<p>This document contains the release notes for the LLVM Compiler
Bill Wendling16133782011-10-26 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 Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]51
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]52<p>For more information about LLVM, including information about the latest
Bill Wendling16133782011-10-26 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 Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]57
Bill Wendling16133782011-10-26 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 Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]62
63</div>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]64
Chris Lattnerce6b0472011-04-05 23:22:33 +0000[diff] [blame]65<!-- Features that need text if they're finished for 3.1:
66 ARM EHABI
Chris Lattnera67df2d2010-04-22 06:28:20 +0000[diff] [blame]67 combiner-aa?
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]68 strong phi elim
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]69 loop dependence analysis
Chris Lattner342f9572010-09-29 05:30:03 +0000[diff] [blame]70 CorrelatedValuePropagation
Chris Lattnerce6b0472011-04-05 23:22:33 +0000[diff] [blame]71 lib/Transforms/IPO/MergeFunctions.cpp => consider for 3.1.
Chris Lattner2b8a52e2008-02-10 07:46:44 +0000[diff] [blame]72 -->
Chris Lattner342f9572010-09-29 05:30:03 +0000[diff] [blame]73
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]74<!-- *********************************************************************** -->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]75<h2>
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]76 <a name="subproj">Sub-project Status Update</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]77</h2>
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]78<!-- *********************************************************************** -->
Chris Lattner625a3d82008-06-08 21:34:41 +0000[diff] [blame]79
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]80<div>
Bill Wendling16133782011-10-26 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 Lattner6d3eeec2011-11-10 20:15:40 +0000[diff] [blame]84 supporting tools), and the Clang repository. In
Bill Wendling16133782011-10-26 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 Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]87
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]88<!--=========================================================================-->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]89<h3>
Chris Lattner44c09cd2008-10-13 18:11:54 +0000[diff] [blame]90<a name="clang">Clang: C/C++/Objective-C Frontend Toolkit</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]91</h3>
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]92
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]93<div>
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]94
Chris Lattner5de7f6e2010-04-26 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 Wendling16133782011-10-26 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 Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]103
Chad Rosier06da55e2011-05-27 22:50:46 +0000[diff] [blame]104<p>In the LLVM 3.0 time-frame, the Clang team has made many improvements:</p>
Douglas Gregor936c75b2011-10-15 00:48:01 +0000[diff] [blame]105
106<ul>
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]107 <li>Greatly improved support for building C++ applications, with greater
108 stability and better diagnostics.</li>
Douglas Gregor936c75b2011-10-15 00:48:01 +0000[diff] [blame]109
Bill Wendling16133782011-10-26 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 Gregor936c75b2011-10-15 00:48:01 +0000[diff] [blame]116
Bill Wendling16133782011-10-26 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 Gregor936c75b2011-10-15 00:48:01 +0000[diff] [blame]119
Bill Wendling16133782011-10-26 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 Gregor936c75b2011-10-15 00:48:01 +0000[diff] [blame]122
Bill Wendling16133782011-10-26 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 Gregor936c75b2011-10-15 00:48:01 +0000[diff] [blame]126
Bill Wendling16133782011-10-26 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 Gregor936c75b2011-10-15 00:48:01 +0000[diff] [blame]130</ul>
131
Chris Lattnerfd97b882011-04-05 07:19:28 +0000[diff] [blame]132
Duncan Sandsce5d9ae2011-04-06 08:07:40 +0000[diff] [blame]133<p>If Clang rejects your code but another compiler accepts it, please take a
Bill Wendling16133782011-10-26 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 Wendlingef362462008-10-27 09:27:33 +0000[diff] [blame]137
Chris Lattner44c09cd2008-10-13 18:11:54 +0000[diff] [blame]138</div>
139
140<!--=========================================================================-->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]141<h3>
Duncan Sands1cd78982011-04-04 11:09:08 +0000[diff] [blame]142<a name="dragonegg">DragonEgg: GCC front-ends, LLVM back-end</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]143</h3>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]144
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]145<div>
Bill Wendling16133782011-10-26 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 Sandsa294c542011-11-10 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 Sands92452b92010-04-02 09:23:15 +0000[diff] [blame]153
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]154<p>The 3.0 release has the following notable changes:</p>
155
Duncan Sandsa294c542011-11-10 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 Sands7f9a0dc2010-09-30 17:37:34 +0000[diff] [blame]170<ul>
Chad Rosier06da55e2011-05-27 22:50:46 +0000[diff] [blame]171<!--
172<li></li>
173-->
Duncan Sands7f9a0dc2010-09-30 17:37:34 +0000[diff] [blame]174</ul>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]175
176</div>
177
Chris Lattner120804a2010-10-03 23:49:06 +0000[diff] [blame]178<!--=========================================================================-->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]179<h3>
Chris Lattner120804a2010-10-03 23:49:06 +0000[diff] [blame]180<a name="compiler-rt">compiler-rt: Compiler Runtime Library</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]181</h3>
Chris Lattner120804a2010-10-03 23:49:06 +0000[diff] [blame]182
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]183<div>
Bill Wendling16133782011-10-26 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 Lattner120804a2010-10-03 23:49:06 +0000[diff] [blame]193
Chad Rosier06da55e2011-05-27 22:50:46 +0000[diff] [blame]194<p>In the LLVM 3.0 timeframe,</p>
Chris Lattner120804a2010-10-03 23:49:06 +0000[diff] [blame]195
196</div>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]197
198<!--=========================================================================-->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]199<h3>
Chris Lattner342f9572010-09-29 05:30:03 +0000[diff] [blame]200<a name="lldb">LLDB: Low Level Debugger</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]201</h3>
Chris Lattner342f9572010-09-29 05:30:03 +0000[diff] [blame]202
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]203<div>
Chris Lattner342f9572010-09-29 05:30:03 +0000[diff] [blame]204
Bill Wendling16133782011-10-26 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 Lattner342f9572010-09-29 05:30:03 +0000[diff] [blame]210
211</div>
212
213<!--=========================================================================-->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]214<h3>
Chris Lattner342f9572010-09-29 05:30:03 +0000[diff] [blame]215<a name="libc++">libc++: C++ Standard Library</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]216</h3>
Chris Lattner342f9572010-09-29 05:30:03 +0000[diff] [blame]217
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]218<div>
Chris Lattner342f9572010-09-29 05:30:03 +0000[diff] [blame]219
Bill Wendling16133782011-10-26 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 Lattner342f9572010-09-29 05:30:03 +0000[diff] [blame]223
224</div>
225
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]226
Chris Lattnercaefe932011-04-07 03:08:22 +0000[diff] [blame]227<!--=========================================================================-->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]228<h3>
Chris Lattnercaefe932011-04-07 03:08:22 +0000[diff] [blame]229<a name="LLBrowse">LLBrowse: IR Browser</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]230</h3>
Daniel Dunbar8fbd8aa2010-10-04 17:39:47 +0000[diff] [blame]231
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]232<div>
Bill Wendling16133782011-10-26 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 Lattnercaefe932011-04-07 03:08:22 +0000[diff] [blame]241</div>
242
243<!--=========================================================================-->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]244<h3>
Chris Lattnercaefe932011-04-07 03:08:22 +0000[diff] [blame]245<a name="vmkit">VMKit</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]246</h3>
Chris Lattnercaefe932011-04-07 03:08:22 +0000[diff] [blame]247
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]248<div>
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]249
Nicolas Geoffray5e515792011-11-10 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 Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]275
Chris Lattnercaefe932011-04-07 03:08:22 +0000[diff] [blame]276</div>
277
278
Daniel Dunbar8fbd8aa2010-10-04 17:39:47 +0000[diff] [blame]279<!--=========================================================================-->
Chris Lattner9ee0b012011-04-05 18:38:45 +0000[diff] [blame]280<!--
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]281<h3>
Daniel Dunbar8fbd8aa2010-10-04 17:39:47 +0000[diff] [blame]282<a name="klee">KLEE: A Symbolic Execution Virtual Machine</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]283</h3>
Daniel Dunbar8fbd8aa2010-10-04 17:39:47 +0000[diff] [blame]284
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]285<div>
Daniel Dunbar8fbd8aa2010-10-04 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 Lattner0d364302011-03-10 07:43:44 +0000[diff] [blame]294<p>UPDATE!</p>
Chris Lattner9ee0b012011-04-05 18:38:45 +0000[diff] [blame]295</div>-->
Daniel Dunbar8fbd8aa2010-10-04 17:39:47 +0000[diff] [blame]296
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]297</div>
Daniel Dunbar8fbd8aa2010-10-04 17:39:47 +0000[diff] [blame]298
Chris Lattner53e06f92009-02-26 22:33:38 +0000[diff] [blame]299<!-- *********************************************************************** -->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]300<h2>
Chad Rosier06da55e2011-05-27 22:50:46 +0000[diff] [blame]301 <a name="externalproj">External Open Source Projects Using LLVM 3.0</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]302</h2>
Chris Lattner53e06f92009-02-26 22:33:38 +0000[diff] [blame]303<!-- *********************************************************************** -->
304
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]305<div>
Chris Lattneraa61f412009-10-13 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 Rosier06da55e2011-05-27 22:50:46 +0000[diff] [blame]309 projects that have already been updated to work with LLVM 3.0.</p>
Chris Lattner120804a2010-10-03 23:49:06 +0000[diff] [blame]310
Chris Lattnerae6a89a2011-04-06 01:13:49 +0000[diff] [blame]311<!--=========================================================================-->
Bill Wendling0ed57472011-10-26 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 Wendling3bb971b2011-10-26 00:14:36 +0000[diff] [blame]325<h3>ClamAV</h3>
326
327<div>
Bill Wendling99ba0b62011-10-25 01:01:42 +0000[diff] [blame]328
Bill Wendling3bb971b2011-10-26 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 Grosser8bee91f2011-11-14 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 Wendling5ee37be2011-10-26 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 Wendlingca8dc4a2011-10-29 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 Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]384<h3>Crack Programming Language</h3>
Chris Lattnerae6a89a2011-04-06 01:13:49 +0000[diff] [blame]385
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]386<div>
Bill Wendlinged4cc442011-11-03 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 Lattnerae6a89a2011-04-06 01:13:49 +0000[diff] [blame]394</div>
Chris Lattnerae6a89a2011-04-06 01:13:49 +0000[diff] [blame]395
396<!--=========================================================================-->
Bill Wendlingb33bd112011-11-08 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<!--=========================================================================-->
Chris Lattnere5b37be2011-11-25 20:28:16 +0000[diff] [blame^]413<h3>FAUST Real-Time Audio Signal Processing Language</h3>
414
415<div>
416
417<p><a href="http://faust.grame.fr/">FAUST</a> is a compiled language for
418 real-time audio signal processing. The name FAUST stands for Functional
419 AUdio STream. Its programming model combines two approaches: functional
420 programming and block diagram composition. In addition with the C, C++, Java
421 output formats, the Faust compiler can now generate LLVM bitcode, and works
422 with LLVM 2.7-3.0.
423 </p>
424
425</div>
426
427<!--=========================================================================-->
Bill Wendling3bb93ad2011-10-26 00:09:55 +0000[diff] [blame]428<h3>Glasgow Haskell Compiler (GHC)</h3>
429
430<div>
431
432<p>GHC is an open source, state-of-the-art programming suite for Haskell, a
433 standard lazy functional programming language. It includes an optimizing
434 static compiler generating good code for a variety of platforms, together
435 with an interactive system for convenient, quick development.</p>
436
437<p>GHC 7.0 and onwards include an LLVM code generator, supporting LLVM 2.8 and
438 later. Since LLVM 2.9, GHC now includes experimental support for the ARM
439 platform with LLVM 3.0.</p>
440
441</div>
442
443<!--=========================================================================-->
Bill Wendling3e3968e2011-10-25 20:35:31 +0000[diff] [blame]444<h3>gwXscript</h3>
445
446<div>
447
448<p><a href="http://botwars.tk/gwscript/">gwXscript</a> is an object oriented,
Bill Wendlingc902d132011-10-26 04:24:15 +0000[diff] [blame]449 aspect oriented programming language which can create both executables (ELF,
Bill Wendling3e3968e2011-10-25 20:35:31 +0000[diff] [blame]450 EXE) and shared libraries (DLL, SO, DYNLIB). The compiler is implemented in
451 its own language and translates scripts into LLVM-IR which can be optimized
452 and translated into native code by the LLVM framework. Source code in
453 gwScript contains definitions that expand the namespaces. So you can build
454 your project and simply 'plug out' features by removing a file. The remaining
455 project does not leave scars since you directly separate concerns by the
456 'template' feature of gwX. It is also possible to add new features to a
457 project by just adding files and without editing the original project. This
458 language is used for example to create games or content management systems
459 that should be extendable.</p>
460
461<p>gwXscript is strongly typed and offers comfort with its native types string,
462 hash and array. You can easily write new libraries in gwXscript or native
463 code. gwXscript is type safe and users should not be able to crash your
464 program or execute malicious code except code that is eating CPU time.</p>
465
466</div>
467
468<!--=========================================================================-->
Bill Wendlinga2ae87b2011-10-26 22:55:18 +0000[diff] [blame]469<h3>include-what-you-use</h3>
470
471<div>
472
473<p><a href="http://code.google.com/p/include-what-you-use">include-what-you-use</a>
474 is a tool to ensure that a file directly <code>#include</code>s
475 all <code>.h</code> files that provide a symbol that the file uses. It also
476 removes superfluous <code>#include</code>s from source files.</p>
477
478</div>
479
480<!--=========================================================================-->
Bill Wendlingfc1935c2011-11-07 22:05:17 +0000[diff] [blame]481<h3>ispc: The Intel SPMD Program Compiler</h3>
482
483<div>
484
485<p><a href="http://ispc.github.com">ispc</a> is a compiler for "single program,
486 multiple data" (SPMD) programs. It compiles a C-based SPMD programming
487 language to run on the SIMD units of CPUs; it often delivers 5-6x speedups on
488 a single core of a CPU with an 8-wide SIMD unit compared to serial code,
489 while still providing a clean and easy-to-understand programming model. For
490 an introduction to the language and its performance,
Chris Lattner6d3eeec2011-11-10 20:15:40 +0000[diff] [blame]491 see <a href="http://ispc.github.com/example.html">the walkthrough</a> of a short
Bill Wendlingfc1935c2011-11-07 22:05:17 +0000[diff] [blame]492 example program. ispc is licensed under the BSD license.</p>
493
494</div>
495
496<!--=========================================================================-->
Bill Wendling4d9c8e52011-10-26 18:20:54 +0000[diff] [blame]497<h3>LanguageKit and Pragmatic Smalltalk</h3>
498
499<div>
500
501<p><a href="http://etoileos.com/etoile/features/languagekit/">LanguageKit</a> is
502 a framework for implementing dynamic languages sharing an object model with
503 Objective-C. It provides static and JIT compilation using LLVM along with
504 its own interpreter. Pragmatic Smalltalk is a dialect of Smalltalk, built on
505 top of LanguageKit, that interfaces directly with Objective-C, sharing the
506 same object representation and message sending behaviour. These projects are
507 developed as part of the &Eacute;toi&eacute; desktop environment.</p>
508
509</div>
510
511<!--=========================================================================-->
Bill Wendlingeda350d2011-11-01 04:08:23 +0000[diff] [blame]512<h3>LuaAV</h3>
513
514<div>
515
516<p><a href="http://lua-av.mat.ucsb.edu/blog/">LuaAV</a> is a real-time
517 audiovisual scripting environment based around the Lua language and a
518 collection of libraries for sound, graphics, and other media protocols. LuaAV
519 uses LLVM and Clang to JIT compile efficient user-defined audio synthesis
520 routines specified in a declarative syntax.</p>
521
522</div>
523
524<!--=========================================================================-->
Bill Wendlingfd9eb5732011-10-26 00:16:17 +0000[diff] [blame]525<h3>Mono</h3>
526
527<div>
528
529<p>An open source, cross-platform implementation of C# and the CLR that is
530 binary compatible with Microsoft.NET. Has an optional, dynamically-loaded
531 LLVM code generation backend in Mini, the JIT compiler.</p>
532
533<p>Note that we use a Git mirror of LLVM with some patches. See:
534 https://github.com/mono/llvm</p>
535
536</div>
537
538<!--=========================================================================-->
Tobias Grossercfa35952011-11-14 09:09:23 +0000[diff] [blame]539<h3>Polly</h3>
540
541<div>
542
543<p><a href="http://polly.grosser.es">Polly</a> is an advanced data-locality
544 optimizer and automatic parallelizer. It uses an advanced, mathematical
545 model to calculate detailed data dependency information which it uses to
546 optimize the loop structure of a program. Polly can speed up sequential code
547 by improving memory locality and consequently the cache use. Furthermore,
548 Polly is able to expose different kind of parallelism which it exploits by
549 introducing (basic) OpenMP and SIMD code. A mid-term goal of Polly is to
550 automatically create optimized GPU code.</p>
551
552</div>
553
554<!--=========================================================================-->
Bill Wendlinge8caad52011-10-25 20:37:45 +0000[diff] [blame]555<h3>Portable OpenCL (pocl)</h3>
556
557<div>
558
559<p>Portable OpenCL is an open source implementation of the OpenCL standard which
560 can be easily adapted for new targets. One of the goals of the project is
561 improving performance portability of OpenCL programs, avoiding the need for
562 target-dependent manual optimizations. A "native" target is included, which
563 allows running OpenCL kernels on the host (CPU).</p>
564
565</div>
566
567<!--=========================================================================-->
Bill Wendling58209292011-10-25 20:39:06 +0000[diff] [blame]568<h3>Pure</h3>
569
570<div>
571<p><a href="http://pure-lang.googlecode.com/">Pure</a> is an
572 algebraic/functional programming language based on term rewriting. Programs
573 are collections of equations which are used to evaluate expressions in a
574 symbolic fashion. The interpreter uses LLVM as a backend to JIT-compile Pure
575 programs to fast native code. Pure offers dynamic typing, eager and lazy
576 evaluation, lexical closures, a hygienic macro system (also based on term
577 rewriting), built-in list and matrix support (including list and matrix
578 comprehensions) and an easy-to-use interface to C and other programming
579 languages (including the ability to load LLVM bitcode modules, and inline C,
580 C++, Fortran and Faust code in Pure programs if the corresponding LLVM-enabled
581 compilers are installed).</p>
582
583<p>Pure version 0.48 has been tested and is known to work with LLVM 3.0
584 (and continues to work with older LLVM releases &gt;= 2.5).</p>
585
586</div>
587
588<!--=========================================================================-->
Bill Wendling97b889d2011-10-26 00:12:04 +0000[diff] [blame]589<h3>Renderscript</h3>
590
591<div>
592
593<p><a href="http://developer.android.com/guide/topics/renderscript/index.html">Renderscript</a>
594 is Android's advanced 3D graphics rendering and compute API. It provides a
595 portable C99-based language with extensions to facilitate common use cases
596 for enhancing graphics and thread level parallelism. The Renderscript
597 compiler frontend is based on Clang/LLVM. It emits a portable bitcode format
598 for the actual compiled script code, as well as reflects a Java interface for
599 developers to control the execution of the compiled bitcode. Executable
600 machine code is then generated from this bitcode by an LLVM backend on the
601 device. Renderscript is thus able to provide a mechanism by which Android
602 developers can improve performance of their applications while retaining
603 portability.</p>
604
605</div>
606
607<!--=========================================================================-->
Bill Wendlingbf72f2c2011-10-25 20:40:26 +0000[diff] [blame]608<h3>SAFECode</h3>
609
610<div>
611
612<p><a href="http://safecode.cs.illinois.edu">SAFECode</a> is a memory safe C/C++
613 compiler built using LLVM. It takes standard, unannotated C/C++ code,
614 analyzes the code to ensure that memory accesses and array indexing
615 operations are safe, and instruments the code with run-time checks when
616 safety cannot be proven statically. SAFECode can be used as a debugging aid
617 (like Valgrind) to find and repair memory safety bugs. It can also be used
618 to protect code from security attacks at run-time.</p>
619
620</div>
621
622<!--=========================================================================-->
Bill Wendling8fae82a2011-10-26 07:38:19 +0000[diff] [blame]623<h3>The Stupid D Compiler (SDC)</h3>
624
625<div>
626
627<p><a href="https://github.com/bhelyer/SDC">The Stupid D Compiler</a> is a
628 project seeking to write a self-hosting compiler for the D programming
629 language without using the frontend of the reference compiler (DMD).</p>
630
631</div>
632
633<!--=========================================================================-->
Bill Wendling53aa7a82011-10-25 20:24:32 +0000[diff] [blame]634<h3>TTA-based Co-design Environment (TCE)</h3>
635
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]636<div>
Bill Wendling53aa7a82011-10-25 20:24:32 +0000[diff] [blame]637
Chris Lattnerae6a89a2011-04-06 01:13:49 +0000[diff] [blame]638<p>TCE is a toolset for designing application-specific processors (ASP) based on
Bill Wendling53aa7a82011-10-25 20:24:32 +0000[diff] [blame]639 the Transport triggered architecture (TTA). The toolset provides a complete
640 co-design flow from C/C++ programs down to synthesizable VHDL and parallel
641 program binaries. Processor customization points include the register files,
642 function units, supported operations, and the interconnection network.</p>
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]643
Chris Lattnerae6a89a2011-04-06 01:13:49 +0000[diff] [blame]644<p>TCE uses Clang and LLVM for C/C++ language support, target independent
Bill Wendling53aa7a82011-10-25 20:24:32 +0000[diff] [blame]645 optimizations and also for parts of code generation. It generates new
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]646 LLVM-based code generators "on the fly" for the designed TTA processors and
647 loads them in to the compiler backend as runtime libraries to avoid
Bill Wendling53aa7a82011-10-25 20:24:32 +0000[diff] [blame]648 per-target recompilation of larger parts of the compiler chain.</p>
Chris Lattnerae6a89a2011-04-06 01:13:49 +0000[diff] [blame]649
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]650</div>
Chris Lattnerae6a89a2011-04-06 01:13:49 +0000[diff] [blame]651
652<!--=========================================================================-->
Bill Wendlingae9aa352011-10-25 20:27:37 +0000[diff] [blame]653<h3>Tart Programming Language</h3>
654
655<div>
656
657<p><a href="http://code.google.com/p/tart/">Tart</a> is a general-purpose,
658 strongly typed programming language designed for application
659 developers. Strongly inspired by Python and C#, Tart focuses on practical
660 solutions for the professional software developer, while avoiding the clutter
661 and boilerplate of legacy languages like Java and C++. Although Tart is still
662 in development, the current implementation supports many features expected of
663 a modern programming language, such as garbage collection, powerful
664 bidirectional type inference, a greatly simplified syntax for template
665 metaprogramming, closures and function literals, reflection, operator
666 overloading, explicit mutability and immutability, and much more. Tart is
667 flexible enough to accommodate a broad range of programming styles and
668 philosophies, while maintaining a strong commitment to simplicity, minimalism
669 and elegance in design.</p>
670
671</div>
672
673<!--=========================================================================-->
Bill Wendlingfe845d52011-10-26 09:25:01 +0000[diff] [blame]674<h3>ThreadSanitizer</h3>
675
676<div>
677
678<p><a href="http://code.google.com/p/data-race-test/">ThreadSanitizer</a> is a
679 data race detector for (mostly) C and C++ code, available for Linux, Mac OS
680 and Windows. On different systems, we use binary instrumentation frameworks
Bill Wendlingedc20872011-10-29 01:11:15 +0000[diff] [blame]681 (Valgrind and Pin) as frontends that generate the program events for the race
682 detection algorithm. On Linux, there's an option of using LLVM-based
683 compile-time instrumentation.</p>
Bill Wendlingfe845d52011-10-26 09:25:01 +0000[diff] [blame]684
685</div>
686
687<!--=========================================================================-->
Bill Wendling39fe2652011-10-26 07:42:45 +0000[diff] [blame]688<h3>The ZooLib C++ Cross-Platform Application Framework</h3>
689
690<div>
691
692<p><a href="http://www.zoolib.org/">ZooLib</a> is Open Source under the MIT
693 License. It provides GUI, filesystem access, TCP networking, thread-safe
694 memory management, threading and locking for Mac OS X, Classic Mac OS,
695 Microsoft Windows, POSIX operating systems with X11, BeOS, Haiku, Apple's iOS
696 and Research in Motion's BlackBerry.</p>
697
698<p>My current work is to use CLang's static analyzer to improve ZooLib's code
699 quality. I also plan to set up LLVM compiles of the demo programs and test
700 programs using CLang and LLVM on all the platforms that CLang, LLVM and
701 ZooLib all support.</p>
702
703</div>
Chris Lattner5ddaab12011-04-07 03:09:21 +0000[diff] [blame]704
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]705</div>
706
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]707<!-- *********************************************************************** -->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]708<h2>
Chad Rosier06da55e2011-05-27 22:50:46 +0000[diff] [blame]709 <a name="whatsnew">What's New in LLVM 3.0?</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]710</h2>
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]711<!-- *********************************************************************** -->
712
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]713<div>
Chris Lattnerb7bc2aa2008-06-08 22:59:35 +0000[diff] [blame]714
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]715<p>This release includes a huge number of bug fixes, performance tweaks and
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]716 minor improvements. Some of the major improvements and new features are
717 listed in this section.</p>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]718
Chris Lattnera67df2d2010-04-22 06:28:20 +0000[diff] [blame]719<!--=========================================================================-->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]720<h3>
Chris Lattnercdc44ed2008-02-06 18:00:06 +0000[diff] [blame]721<a name="majorfeatures">Major New Features</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]722</h3>
Chris Lattnercdc44ed2008-02-06 18:00:06 +0000[diff] [blame]723
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]724<div>
Chris Lattnercdc44ed2008-02-06 18:00:06 +0000[diff] [blame]725
Chris Lattner6d3eeec2011-11-10 20:15:40 +0000[diff] [blame]726<p><b>llvm-gcc is gone</b></p>
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]727
Chris Lattner6d3eeec2011-11-10 20:15:40 +0000[diff] [blame]728<p>LLVM 3.0 includes several major new capabilities:</p>
729
Chris Lattner92f21832011-11-15 22:13:27 +0000[diff] [blame]730<!-- Near dead:
731 Analysis/RegionInfo.h + Dom Frontiers
732 SparseBitVector: used in LiveVar.
733
734 -->
735
736<!--
737 Type system rewrite.
738 Better performance for Neon code in clang due to SRoA improvements.
739 New regalloc on by default. Lin scan going away in 3.1
740 PGO / builtin_expect improvements (summary needed)
741 Big EH rewrite.
742 AVX support, assembler, compiler and disassembler.
743 IndVar improvements: andy
744 PTX backend improvements: Justin
745 llvm-rtdyld & MC JIT: JimG
746 InstAliases now automatically used in the asmprinter where they are shorter.
747 Integrated assembler on by default for arm/thumb?
748 PostOrder Dominator frontiers were removed.
749 Line Profiling / gcov support
750 EH and debug information produced with CFI directives, yielding smaller executables: http://blog.mozilla.com/respindola/2011/05/12/cfi-directives/
751 X86-64 generates smaller and faster code at -O0 (fast isel improvements)
752 Better code generation for Cortex-A9
753 Many APIs take ArrayRef's now.
754 Pass manager extension API.
755
756 -->
757
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]758<ul>
Chris Lattnerc3a2c982011-04-06 00:45:11 +0000[diff] [blame]759
Chad Rosier06da55e2011-05-27 22:50:46 +0000[diff] [blame]760<!--
761<li></li>
762-->
Chris Lattner9ee0b012011-04-05 18:38:45 +0000[diff] [blame]763
Chris Lattner458e79f2008-02-10 08:18:42 +0000[diff] [blame]764</ul>
Chris Lattnerfd97b882011-04-05 07:19:28 +0000[diff] [blame]765
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]766</div>
767
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]768<!--=========================================================================-->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]769<h3>
Chris Lattnerd1094e02009-03-02 02:37:32 +0000[diff] [blame]770<a name="coreimprovements">LLVM IR and Core Improvements</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]771</h3>
Chris Lattnerdd6acc02008-02-10 08:17:19 +0000[diff] [blame]772
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]773<div>
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]774
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]775<p>LLVM IR has several new features for better support of new targets and that
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]776 expose new optimization opportunities:</p>
Chris Lattnerdd6acc02008-02-10 08:17:19 +0000[diff] [blame]777
Bill Wendlingd535a6e2011-10-26 18:33:01 +0000[diff] [blame]778<p>One of the biggest changes is that 3.0 has a new exception handling
779 system. The old system used LLVM intrinsics to convey the exception handling
780 information to the code generator. It worked in most cases, but not
781 all. Inlining was especially difficult to get right. Also, the intrinsics
782 could be moved away from the <code>invoke</code> instruction, making it hard
783 to recover that information.</p>
784
785<p>The new EH system makes exception handling a first-class member of the IR. It
786 adds two new instructions:</p>
787
Chris Lattnerb7112222008-06-05 06:25:56 +0000[diff] [blame]788<ul>
Bill Wendlingd535a6e2011-10-26 18:33:01 +0000[diff] [blame]789 <li><a href="LangRef.html#i_landingpad"><code>landingpad</code></a> &mdash;
790 this instruction defines a landing pad basic block. It contains all of the
791 information that's needed by the code generator. It's also required to be
792 the first non-PHI instruction in the landing pad. In addition, a landing
793 pad may be jumped to only by the unwind edge of an <code>invoke</code>
794 instruction.</li>
795
796 <li><a href="LangRef.html#i_resume"><code>resume</code></a> &mdash; this
797 instruction causes the current exception to resume traveling up the
798 stack. It replaces the <code>@llvm.eh.resume</code> intrinsic.</li>
Chris Lattnerdd6acc02008-02-10 08:17:19 +0000[diff] [blame]799</ul>
Mikhail Glushenkov024f7cf2008-10-13 02:08:34 +0000[diff] [blame]800
Bill Wendlingd535a6e2011-10-26 18:33:01 +0000[diff] [blame]801<p>Converting from the old EH API to the new EH API is rather simple, because a
802 lot of complexity has been removed. The two intrinsics,
803 <code>@llvm.eh.exception</code> and <code>@llvm.eh.selector</code> have been
804 superceded by the <code>landingpad</code> instruction. Instead of generating
805 a call to <code>@llvm.eh.exception</code> and <code>@llvm.eh.selector</code>:
806
807<div class="doc_code">
808<pre>
809Function *ExcIntr = Intrinsic::getDeclaration(TheModule,
810 Intrinsic::eh_exception);
811Function *SlctrIntr = Intrinsic::getDeclaration(TheModule,
812 Intrinsic::eh_selector);
813
814// The exception pointer.
815Value *ExnPtr = Builder.CreateCall(ExcIntr, "exc_ptr");
816
817std::vector&lt;Value*&gt; Args;
818Args.push_back(ExnPtr);
819Args.push_back(Builder.CreateBitCast(Personality,
820 Type::getInt8PtrTy(Context)));
821
822<i>// Add selector clauses to Args.</i>
823
824// The selector call.
825Builder.CreateCall(SlctrIntr, Args, "exc_sel");
826</pre>
827</div>
828
829<p>You should instead generate a <code>landingpad</code> instruction, that
830 returns an exception object and selector value:</p>
831
832<div class="doc_code">
833<pre>
834LandingPadInst *LPadInst =
835 Builder.CreateLandingPad(StructType::get(Int8PtrTy, Int32Ty, NULL),
836 Personality, 0);
837
838Value *LPadExn = Builder.CreateExtractValue(LPadInst, 0);
839Builder.CreateStore(LPadExn, getExceptionSlot());
840
841Value *LPadSel = Builder.CreateExtractValue(LPadInst, 1);
842Builder.CreateStore(LPadSel, getEHSelectorSlot());
843</pre>
844</div>
845
846<p>It's now trivial to add the individual clauses to the <code>landingpad</code>
847 instruction.</p>
848
849<div class="doc_code">
850<pre>
851<i><b>// Adding a catch clause</b></i>
852Constant *TypeInfo = getTypeInfo();
853LPadInst-&gt;addClause(TypeInfo);
854
855<i><b>// Adding a C++ catch-all</b></i>
856LPadInst-&gt;addClause(Constant::getNullValue(Builder.getInt8PtrTy()));
857
858<i><b>// Adding a cleanup</b></i>
859LPadInst-&gt;setCleanup(true);
860
861<i><b>// Adding a filter clause</b></i>
862std::vector&lt;Constant*&gt; TypeInfos;
863Constant *TypeInfo = getFilterTypeInfo();
864TypeInfos.push_back(Builder.CreateBitCast(TypeInfo, Builder.getInt8PtrTy()));
865
866ArrayType *FilterTy = ArrayType::get(Int8PtrTy, TypeInfos.size());
867LPadInst-&gt;addClause(ConstantArray::get(FilterTy, TypeInfos));
868</pre>
869</div>
870
871<p>Converting from using the <code>@llvm.eh.resume</code> intrinsic to
872 the <code>resume</code> instruction is trivial. It takes the exception
873 pointer and exception selector values returned by
874 the <code>landingpad</code> instruction:</p>
875
876<div class="doc_code">
877<pre>
878Type *UnwindDataTy = StructType::get(Builder.getInt8PtrTy(),
879 Builder.getInt32Ty(), NULL);
880Value *UnwindData = UndefValue::get(UnwindDataTy);
881Value *ExcPtr = Builder.CreateLoad(getExceptionObjSlot());
882Value *ExcSel = Builder.CreateLoad(getExceptionSelSlot());
883UnwindData = Builder.CreateInsertValue(UnwindData, ExcPtr, 0, "exc_ptr");
884UnwindData = Builder.CreateInsertValue(UnwindData, ExcSel, 1, "exc_sel");
885Builder.CreateResume(UnwindData);
886</pre>
887</div>
888
Chris Lattnerdd6acc02008-02-10 08:17:19 +0000[diff] [blame]889</div>
890
891<!--=========================================================================-->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]892<h3>
Andrew Trick6c0a11b2011-11-06 17:59:24 +0000[diff] [blame]893<a name="loopoptimization">Loop Optimization Improvements</a>
894</h3>
895
896<div>
897<p>The induction variable simplification pass in 3.0 only modifies
898 induction variables when profitable. Sign and zero extension
899 elimination, linear function test replacement, loop unrolling, and
900 other simplifications that require induction variable analysis have
901 been generalized so they no longer require loops to be rewritten in a
902 typically suboptimal form prior to optimization. This new design
903 preserves more IR level information, avoids undoing earlier loop
904 optimizations (particularly hand-optimized loops), and no longer
905 strongly depends on the code generator rewriting loops a second time
906 in a now optimal form--an intractable problem.</p>
907
908<p>The original behavior can be restored with -mllvm -enable-iv-rewrite;
909 however, support for this mode will be short lived. As such, bug
910 reports should be filed for any significant performance regressions
911 when moving from -mllvm -enable-iv-rewrite to the 3.0 default mode.</p>
912</div>
913
914<!--=========================================================================-->
915<h3>
Chris Lattner2b8a52e2008-02-10 07:46:44 +0000[diff] [blame]916<a name="optimizer">Optimizer Improvements</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]917</h3>
Chris Lattner2b8a52e2008-02-10 07:46:44 +0000[diff] [blame]918
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]919<div>
Chris Lattner2b8a52e2008-02-10 07:46:44 +0000[diff] [blame]920
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]921<p>In addition to a large array of minor performance tweaks and bug fixes, this
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]922 release includes a few major enhancements and additions to the
923 optimizers:</p>
Chris Lattner2b8a52e2008-02-10 07:46:44 +0000[diff] [blame]924
925<ul>
Chad Rosier06da55e2011-05-27 22:50:46 +0000[diff] [blame]926<!--
927<li></li>
928-->
Chris Lattner23e16b592011-04-06 05:50:04 +0000[diff] [blame]929</li>
Chris Lattnerc3a2c982011-04-06 00:45:11 +0000[diff] [blame]930
Chris Lattnerfcc65a72010-10-04 02:42:39 +0000[diff] [blame]931</ul>
932
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]933</div>
Chris Lattnerd1094e02009-03-02 02:37:32 +0000[diff] [blame]934
Chris Lattner7795ea92008-06-08 02:45:07 +0000[diff] [blame]935<!--=========================================================================-->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]936<h3>
Chris Lattnerf25bc192010-09-30 16:31:33 +0000[diff] [blame]937<a name="mc">MC Level Improvements</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]938</h3>
Chris Lattnerf25bc192010-09-30 16:31:33 +0000[diff] [blame]939
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]940<div>
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]941
942<p>The LLVM Machine Code (aka MC) subsystem was created to solve a number of
943 problems in the realm of assembly, disassembly, object file format handling,
944 and a number of other related areas that CPU instruction-set level tools work
945 in.</p>
Chris Lattnerbf1cf672010-10-02 21:59:30 +0000[diff] [blame]946
Chris Lattnerbf1cf672010-10-02 21:59:30 +0000[diff] [blame]947<ul>
Jim Grosbach651e2ee2011-11-24 00:49:21 +0000[diff] [blame]948 <li>The ELF object streamers are much more full featured.</li>
949 <li>Target dependent relocation handling has been refactored into the Targets.</li>
950 <li>Early stage MC-JIT infrastructure has been implemented.</li>
Chris Lattnerbf1cf672010-10-02 21:59:30 +0000[diff] [blame]951</ul>
952
Jim Grosbach651e2ee2011-11-24 00:49:21 +0000[diff] [blame]953<p>The MC-JIT is a major new feature for MC, and will eventually grow to replace
954the current JIT implementation. It emits object files direct to memory and
955uses a runtime dynamic linker to resolve references and drive lazy compilation.
956The MC-JIT enables much greater code reuse between the JIT and the static
957compiler and provides better integration with the platform ABI as a result.</p>
958
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]959<p>For more information, please see
960 the <a href="http://blog.llvm.org/2010/04/intro-to-llvm-mc-project.html">Intro
961 to the LLVM MC Project Blog Post</a>.</p>
Chris Lattnerf25bc192010-09-30 16:31:33 +0000[diff] [blame]962
NAKAMURA Takumi8d89b8e2011-04-05 08:24:22 +0000[diff] [blame]963</div>
Chris Lattnerf25bc192010-09-30 16:31:33 +0000[diff] [blame]964
Chris Lattnerf25bc192010-09-30 16:31:33 +0000[diff] [blame]965<!--=========================================================================-->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]966<h3>
Chris Lattnerd434bfb2009-03-02 03:24:11 +0000[diff] [blame]967<a name="codegen">Target Independent Code Generator Improvements</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]968</h3>
Chris Lattner7795ea92008-06-08 02:45:07 +0000[diff] [blame]969
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]970<div>
Chris Lattner7795ea92008-06-08 02:45:07 +0000[diff] [blame]971
Mikhail Glushenkov25422542009-03-01 18:09:47 +0000[diff] [blame]972<p>We have put a significant amount of work into the code generator
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]973 infrastructure, which allows us to implement more aggressive algorithms and
974 make it run faster:</p>
Chris Lattner7795ea92008-06-08 02:45:07 +0000[diff] [blame]975
976<ul>
Chad Rosier06da55e2011-05-27 22:50:46 +0000[diff] [blame]977<!--
978<li></li>
979-->
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]980</ul>
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]981</div>
982
Chris Lattnerd1094e02009-03-02 02:37:32 +0000[diff] [blame]983<!--=========================================================================-->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]984<h3>
Chris Lattnerd1094e02009-03-02 02:37:32 +0000[diff] [blame]985<a name="x86">X86-32 and X86-64 Target Improvements</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]986</h3>
Chris Lattnerd1094e02009-03-02 02:37:32 +0000[diff] [blame]987
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]988<div>
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]989
990<p>New features and major changes in the X86 target include:</p>
Chris Lattnerd1094e02009-03-02 02:37:32 +0000[diff] [blame]991
992<ul>
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]993
Chris Lattnerdfcdd0c2011-11-15 22:48:24 +0000[diff] [blame]994 <li>The X86 backend now supports
995 all <a href="http://llvm.org/PR879">inline assembly that uses the X86
996 floating point stack</a>.</li>
997
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]998 <li>The CRC32 intrinsics have been renamed. The intrinsics were previously
999 <code>@llvm.x86.sse42.crc32.[8|16|32]</code>
1000 and <code>@llvm.x86.sse42.crc64.[8|64]</code>. They have been renamed to
1001 <code>@llvm.x86.sse42.crc32.32.[8|16|32]</code> and
1002 <code>@llvm.x86.sse42.crc32.64.[8|64]</code>.</li>
Chad Rosierd1db4f82011-05-27 20:13:10 +0000[diff] [blame]1003
Chris Lattnerd1094e02009-03-02 02:37:32 +0000[diff] [blame]1004</ul>
1005
Chris Lattnerd1094e02009-03-02 02:37:32 +0000[diff] [blame]1006</div>
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]1007
1008<!--=========================================================================-->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1009<h3>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]1010<a name="ARM">ARM Target Improvements</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1011</h3>
Chris Lattnerc92d7692009-03-01 02:30:21 +0000[diff] [blame]1012
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]1013<div>
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1014
1015<p>New features of the ARM target include:</p>
Chris Lattnerc92d7692009-03-01 02:30:21 +0000[diff] [blame]1016
1017<ul>
Jim Grosbach651e2ee2011-11-24 00:49:21 +0000[diff] [blame]1018 <li>Reworked Set Jump Long Jump EH Lowering,</li>
1019 <li>improved support for Cortex-M series processors, and</li>
1020 <li>beta quality integrated assembler support.</li>
Bob Wilsone44f2982010-09-13 17:39:35 +0000[diff] [blame]1021</ul>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]1022</div>
Chris Lattner212a0862011-11-15 22:23:46 +0000[diff] [blame]1023
Chris Lattnerc3a2c982011-04-06 00:45:11 +0000[diff] [blame]1024
1025<!--=========================================================================-->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1026<h3>
Akira Hatanakab89a58d2011-11-15 21:33:05 +0000[diff] [blame]1027<a name="MIPS">MIPS Target Improvements</a>
1028</h3>
1029
1030<div>
1031
1032<p>New features and major changes in the MIPS target include:</p>
1033
1034<ul>
1035 <li>Most MIPS32r1 and r2 instructions are now supported.</li>
1036 <li>LE/BE MIPS32r1/r2 has been tested extensively.</li>
1037 <li>O32 ABI has been fully tested.</li>
1038 <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>
1039 <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>
1040 <li>Support for old-style JIT is complete.</li>
1041 <li>Support for old architectures (MIPS1 and MIPS2) has been removed.</li>
1042 <li>Initial support for MIPS64 has been added.</li>
1043</ul>
1044</div>
Chris Lattner212a0862011-11-15 22:23:46 +0000[diff] [blame]1045
1046<!--=========================================================================-->
1047<h3>
1048 <a name="PTX">PTX Target Improvements</a>
1049</h3>
1050
1051<div>
Akira Hatanakab89a58d2011-11-15 21:33:05 +0000[diff] [blame]1052
Chris Lattner212a0862011-11-15 22:23:46 +0000[diff] [blame]1053 <p>
1054 The PTX back-end is still experimental, but is fairly usable for compute kernels
1055 in LLVM 3.0. Most scalar arithmetic is implemented, as well as intrinsics to
1056 access the special PTX registers and sync instructions. The major missing
1057 pieces are texture/sampler support and some vector operations.</p>
1058
1059 <p>That said, the backend is already being used for domain-specific languages
1060 and works well with the <a href="http://www.pcc.me.uk/~peter/libclc/">libclc
1061 library</a> to supply OpenCL built-ins. With it, you can use Clang to compile
1062 OpenCL code into PTX and execute it by loading the resulting PTX as a binary
1063 blob using the nVidia OpenCL library. It has been tested with several OpenCL
1064 programs, including some from the nVidia GPU Computing SDK, and the performance
1065 is on par with the nVidia compiler.</p>
1066
1067</div>
1068
Akira Hatanakab89a58d2011-11-15 21:33:05 +0000[diff] [blame]1069<!--=========================================================================-->
1070<h3>
Chris Lattnerc3a2c982011-04-06 00:45:11 +0000[diff] [blame]1071<a name="OtherTS">Other Target Specific Improvements</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1072</h3>
Chris Lattnerc92d7692009-03-01 02:30:21 +0000[diff] [blame]1073
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]1074<div>
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1075
Chris Lattner6d3eeec2011-11-10 20:15:40 +0000[diff] [blame]1076 <p>PPC32/ELF va_arg was implemented.</p>
1077 <p>PPC32 initial support for .o file writing was implemented.</p>
Wesley Peck1c29a832011-11-14 18:56:41 +0000[diff] [blame]1078 <p>MicroBlaze scheduling itineraries were added that model the
1079 3-stage and the 5-stage pipeline architectures. The 3-stage
1080 pipeline model can be selected with <code>-mcpu=mblaze3</code>
1081 and the 5-stage pipeline model can be selected with
1082 <code>-mcpu=mblaze5</code>.</p>
Chris Lattner6d3eeec2011-11-10 20:15:40 +0000[diff] [blame]1083
Chris Lattnerc3a2c982011-04-06 00:45:11 +0000[diff] [blame]1084<ul>
Chad Rosier06da55e2011-05-27 22:50:46 +0000[diff] [blame]1085<!--
1086<li></li>
1087-->
Chris Lattnerc3a2c982011-04-06 00:45:11 +0000[diff] [blame]1088</ul>
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1089
Chris Lattnerc3a2c982011-04-06 00:45:11 +0000[diff] [blame]1090</div>
Chris Lattner6cb64032008-06-05 08:02:49 +0000[diff] [blame]1091
1092<!--=========================================================================-->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1093<h3>
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]1094<a name="changes">Major Changes and Removed Features</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1095</h3>
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]1096
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]1097<div>
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]1098
Bill Wendling2d3138c2011-08-03 22:18:20 +0000[diff] [blame]1099<p>If you're already an LLVM user or developer with out-of-tree changes based on
1100 LLVM 2.9, this section lists some "gotchas" that you may run into upgrading
1101 from the previous release.</p>
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]1102
1103<ul>
Eric Christopher508503b2011-09-28 19:47:28 +0000[diff] [blame]1104 <li>The <code>LLVMC</code> front end code was removed while separating
1105 out language independence.</li>
Jay Foad2755e072011-08-04 10:43:43 +0000[diff] [blame]1106 <li>The <code>LowerSetJmp</code> pass wasn't used effectively by any
1107 target and has been removed.</li>
Rafael Espindolaa45c20b2011-08-30 23:03:45 +0000[diff] [blame]1108 <li>The old <code>TailDup</code> pass was not used in the standard pipeline
1109 and was unable to update ssa form, so it has been removed.
Eli Friedman02e737b2011-08-12 22:50:01 +0000[diff] [blame]1110 <li>The syntax of volatile loads and stores in IR has been changed to
1111 "<code>load volatile</code>"/"<code>store volatile</code>". The old
1112 syntax ("<code>volatile load</code>"/"<code>volatile store</code>")
1113 is still accepted, but is now considered deprecated.</li>
Eli Friedman2c25d9c2011-10-26 00:55:23 +0000[diff] [blame]1114 <li>The old atomic intrinscs (<code>llvm.memory.barrier</code> and
1115 <code>llvm.atomic.*</code>) are now gone. Please use the new atomic
1116 instructions, described in the <a href="Atomics.html">atomics guide</a>.
Devang Pateldbf83832008-10-14 20:03:43 +0000[diff] [blame]1117</ul>
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]1118
NAKAMURA Takumi2b462b52011-08-22 23:22:05 +0000[diff] [blame]1119<h4>Windows (32-bit)</h4>
1120<div>
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1121
NAKAMURA Takumi2b462b52011-08-22 23:22:05 +0000[diff] [blame]1122<ul>
1123 <li>On Win32(MinGW32 and MSVC), Windows 2000 will not be supported.
1124 Windows XP or higher is required.</li>
1125</ul>
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1126
NAKAMURA Takumi2b462b52011-08-22 23:22:05 +0000[diff] [blame]1127</div>
1128
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]1129</div>
1130
Daniel Dunbarf70898a2010-10-04 20:11:41 +0000[diff] [blame]1131<!--=========================================================================-->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1132<h3>
Chris Lattnerc3a2c982011-04-06 00:45:11 +0000[diff] [blame]1133<a name="api_changes">Internal API Changes</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1134</h3>
Daniel Dunbarf70898a2010-10-04 20:11:41 +0000[diff] [blame]1135
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]1136<div>
Daniel Dunbarf70898a2010-10-04 20:11:41 +0000[diff] [blame]1137
Chris Lattnerc3a2c982011-04-06 00:45:11 +0000[diff] [blame]1138<p>In addition, many APIs have changed in this release. Some of the major
Bill Wendling46ffaa92011-08-02 06:20:17 +0000[diff] [blame]1139 LLVM API changes are:</p>
Daniel Dunbarf70898a2010-10-04 20:11:41 +0000[diff] [blame]1140
1141<ul>
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1142 <li>The biggest and most pervasive change is that llvm::Type's are no longer
1143 returned or accepted as 'const' values. Instead, just pass around
1144 non-const Type's.</li>
Chris Lattner14b3b4d2011-07-18 04:56:02 +0000[diff] [blame]1145
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1146 <li><code>PHINode::reserveOperandSpace</code> has been removed. Instead, you
1147 must specify how many operands to reserve space for when you create the
1148 PHINode, by passing an extra argument
1149 into <code>PHINode::Create</code>.</li>
Jay Foade03f15a2011-07-14 09:19:05 +0000[diff] [blame]1150
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1151 <li>PHINodes no longer store their incoming BasicBlocks as operands. Instead,
1152 the list of incoming BasicBlocks is stored separately, and can be accessed
1153 with new functions <code>PHINode::block_begin</code>
1154 and <code>PHINode::block_end</code>.</li>
Jay Foade03f15a2011-07-14 09:19:05 +0000[diff] [blame]1155
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1156 <li>Various functions now take an <code>ArrayRef</code> instead of either a
1157 pair of pointers (or iterators) to the beginning and end of a range, or a
1158 pointer and a length. Others now return an <code>ArrayRef</code> instead
1159 of a reference to a <code>SmallVector</code>
1160 or <code>std::vector</code>. These include:
Jay Foade03f15a2011-07-14 09:19:05 +0000[diff] [blame]1161<ul>
1162<!-- Please keep this list sorted. -->
Jay Foad5bd375a2011-07-15 08:37:34 +0000[diff] [blame]1163<li><code>CallInst::Create</code></li>
Jay Foade03f15a2011-07-14 09:19:05 +0000[diff] [blame]1164<li><code>ComputeLinearIndex</code> (in <code>llvm/CodeGen/Analysis.h</code>)</li>
1165<li><code>ConstantArray::get</code></li>
1166<li><code>ConstantExpr::getExtractElement</code></li>
Jay Foaded8db7d2011-07-21 14:31:17 +0000[diff] [blame]1167<li><code>ConstantExpr::getGetElementPtr</code></li>
1168<li><code>ConstantExpr::getInBoundsGetElementPtr</code></li>
Jay Foade03f15a2011-07-14 09:19:05 +0000[diff] [blame]1169<li><code>ConstantExpr::getIndices</code></li>
1170<li><code>ConstantExpr::getInsertElement</code></li>
1171<li><code>ConstantExpr::getWithOperands</code></li>
Jay Foadf4b14a22011-07-19 13:32:40 +0000[diff] [blame]1172<li><code>ConstantFoldCall</code> (in <code>llvm/Analysis/ConstantFolding.h</code>)</li>
1173<li><code>ConstantFoldInstOperands</code> (in <code>llvm/Analysis/ConstantFolding.h</code>)</li>
Jay Foade03f15a2011-07-14 09:19:05 +0000[diff] [blame]1174<li><code>ConstantVector::get</code></li>
1175<li><code>DIBuilder::createComplexVariable</code></li>
1176<li><code>DIBuilder::getOrCreateArray</code></li>
1177<li><code>ExtractValueInst::Create</code></li>
1178<li><code>ExtractValueInst::getIndexedType</code></li>
1179<li><code>ExtractValueInst::getIndices</code></li>
1180<li><code>FindInsertedValue</code> (in <code>llvm/Analysis/ValueTracking.h</code>)</li>
Jay Foad528beda2011-07-19 14:42:50 +0000[diff] [blame]1181<li><code>gep_type_begin</code> (in <code>llvm/Support/GetElementPtrTypeIterator.h</code>)</li>
1182<li><code>gep_type_end</code> (in <code>llvm/Support/GetElementPtrTypeIterator.h</code>)</li>
Jay Foadd1b78492011-07-25 09:48:08 +0000[diff] [blame]1183<li><code>GetElementPtrInst::Create</code></li>
1184<li><code>GetElementPtrInst::CreateInBounds</code></li>
1185<li><code>GetElementPtrInst::getIndexedType</code></li>
Jay Foad857a48a2011-07-21 14:42:51 +0000[diff] [blame]1186<li><code>InsertValueInst::Create</code></li>
1187<li><code>InsertValueInst::getIndices</code></li>
1188<li><code>InvokeInst::Create</code></li>
Jay Foad5bd375a2011-07-15 08:37:34 +0000[diff] [blame]1189<li><code>IRBuilder::CreateCall</code></li>
Jay Foade03f15a2011-07-14 09:19:05 +0000[diff] [blame]1190<li><code>IRBuilder::CreateExtractValue</code></li>
Jay Foad040dd822011-07-22 08:16:57 +0000[diff] [blame]1191<li><code>IRBuilder::CreateGEP</code></li>
1192<li><code>IRBuilder::CreateInBoundsGEP</code></li>
Jay Foade03f15a2011-07-14 09:19:05 +0000[diff] [blame]1193<li><code>IRBuilder::CreateInsertValue</code></li>
Jay Foad5bd375a2011-07-15 08:37:34 +0000[diff] [blame]1194<li><code>IRBuilder::CreateInvoke</code></li>
Jay Foade03f15a2011-07-14 09:19:05 +0000[diff] [blame]1195<li><code>MDNode::get</code></li>
1196<li><code>MDNode::getIfExists</code></li>
1197<li><code>MDNode::getTemporary</code></li>
1198<li><code>MDNode::getWhenValsUnresolved</code></li>
Jay Foadb992a632011-07-19 15:07:52 +0000[diff] [blame]1199<li><code>SimplifyGEPInst</code> (in <code>llvm/Analysis/InstructionSimplify.h</code>)</li>
Jay Foadbf904772011-07-19 14:01:37 +0000[diff] [blame]1200<li><code>TargetData::getIndexedOffset</code></li>
Jay Foade03f15a2011-07-14 09:19:05 +0000[diff] [blame]1201</ul></li>
1202
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1203 <li>All forms of <code>StringMap::getOrCreateValue</code> have been remove
1204 except for the one which takes a <code>StringRef</code>.</li>
Jay Foade03f15a2011-07-14 09:19:05 +0000[diff] [blame]1205
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1206 <li>The <code>LLVMBuildUnwind</code> function from the C API was removed. The
1207 LLVM <code>unwind</code> instruction has been deprecated for a long time
1208 and isn't used by the current front-ends. So this was removed during the
1209 exception handling rewrite.</li>
Bill Wendling46ffaa92011-08-02 06:20:17 +0000[diff] [blame]1210
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1211 <li>The <code>LLVMAddLowerSetJmpPass</code> function from the C API was
1212 removed because the <code>LowerSetJmp</code> pass was removed.</li>
Bill Wendling2d3138c2011-08-03 22:18:20 +0000[diff] [blame]1213
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1214 <li>The <code>DIBuilder</code> interface used by front ends to encode
1215 debugging information in the LLVM IR now expects clients to
1216 use <code>DIBuilder::finalize()</code> at the end of translation unit to
1217 complete debugging information encoding.</li>
Devang Patel2b8acaf2011-08-15 23:00:00 +0000[diff] [blame]1218
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1219 <li>The way the type system works has been
1220 rewritten: <code>PATypeHolder</code> and <code>OpaqueType</code> are gone,
1221 and all APIs deal with <code>Type*</code> instead of <code>const
1222 Type*</code>. If you need to create recursive structures, then create a
1223 named structure, and use <code>setBody()</code> when all its elements are
1224 built. Type merging and refining is gone too: named structures are not
1225 merged with other structures, even if their layout is identical. (of
1226 course anonymous structures are still uniqued by layout).</li>
Torok Edwin52cac092011-09-30 13:07:52 +0000[diff] [blame]1227
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1228 <li>TargetSelect.h moved to Support/ from Target/</li>
Torok Edwin52cac092011-09-30 13:07:52 +0000[diff] [blame]1229
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1230 <li>UpgradeIntrinsicCall no longer upgrades pre-2.9 intrinsic calls (for
1231 example <code>llvm.memset.i32</code>).</li>
Torok Edwin52cac092011-09-30 13:07:52 +0000[diff] [blame]1232
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1233 <li>It is mandatory to initialize all out-of-tree passes too and their dependencies now with
1234 <code>INITIALIZE_PASS{BEGIN,END,}</code>
1235 and <code>INITIALIZE_{PASS,AG}_DEPENDENCY</code>.</li>
Torok Edwin52cac092011-09-30 13:07:52 +0000[diff] [blame]1236
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1237 <li>The interface for MemDepResult in MemoryDependenceAnalysis has been
1238 enhanced with new return types Unknown and NonFuncLocal, in addition to
1239 the existing types Clobber, Def, and NonLocal.</li>
Daniel Dunbarf70898a2010-10-04 20:11:41 +0000[diff] [blame]1240</ul>
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1241
Daniel Dunbarf70898a2010-10-04 20:11:41 +0000[diff] [blame]1242</div>
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]1243
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]1244</div>
1245
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]1246<!-- *********************************************************************** -->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1247<h2>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]1248 <a name="knownproblems">Known Problems</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1249</h2>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]1250<!-- *********************************************************************** -->
1251
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]1252<div>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]1253
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1254<p>This section contains significant known problems with the LLVM system, listed
1255 by component. If you run into a problem, please check
1256 the <a href="http://llvm.org/bugs/">LLVM bug database</a> and submit a bug if
1257 there isn't already one.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]1258
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]1259<!-- ======================================================================= -->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1260<h3>
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]1261 <a name="experimental">Experimental features included with this release</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1262</h3>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]1263
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]1264<div>
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]1265
Misha Brukmanfa50a222004-05-12 21:46:05 +0000[diff] [blame]1266<p>The following components of this LLVM release are either untested, known to
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1267 be broken or unreliable, or are in early development. These components
1268 should not be relied on, and bugs should not be filed against them, but they
1269 may be useful to some people. In particular, if you would like to work on
1270 one of these components, please contact us on
1271 the <a href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVMdev
1272 list</a>.</p>
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]1273
1274<ul>
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1275 <li>The Alpha, Blackfin, CellSPU, MicroBlaze, MSP430, MIPS, PTX, SystemZ and
1276 XCore backends are experimental.</li>
1277
1278 <li><tt>llc</tt> "<tt>-filetype=obj</tt>" is experimental on all targets other
1279 than darwin and ELF X86 systems.</li>
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]1280</ul>
1281
1282</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]1283
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]1284<!-- ======================================================================= -->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1285<h3>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]1286 <a name="x86-be">Known problems with the X86 back-end</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1287</h3>
John Criswell3bdbd302005-11-08 21:11:33 +0000[diff] [blame]1288
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]1289<div>
John Criswell3bdbd302005-11-08 21:11:33 +0000[diff] [blame]1290
1291<ul>
Chris Lattner0e439c9b2011-11-17 01:42:23 +0000[diff] [blame]1292 <li>The X86-64 backend <a href="http://llvm.org/PR1740">does not yet support
1293 the <tt>va_arg</tt> LLVM IR instruction</a>. Currently, front-ends support
1294 variadic argument constructs on X86-64 by lowering them manually.</li>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]1295</ul>
1296
1297</div>
1298
1299<!-- ======================================================================= -->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1300<h3>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]1301 <a name="ppc-be">Known problems with the PowerPC back-end</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1302</h3>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]1303
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]1304<div>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]1305
1306<ul>
Roman Divacky2634d772011-10-30 07:49:04 +0000[diff] [blame]1307 <li>The PPC32/ELF support lacks PIC support.</li>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]1308</ul>
1309
1310</div>
1311
1312<!-- ======================================================================= -->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1313<h3>
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]1314 <a name="arm-be">Known problems with the ARM back-end</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1315</h3>
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]1316
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]1317<div>
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]1318
1319<ul>
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1320 <li>Thumb mode works only on ARMv6 or higher processors. On sub-ARMv6
1321 processors, thumb programs can crash or produce wrong results
1322 (<a href="http://llvm.org/PR1388">PR1388</a>).</li>
1323
1324 <li>Compilation for ARM Linux OABI (old ABI) is supported but not fully
1325 tested.</li>
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]1326</ul>
1327
1328</div>
1329
1330<!-- ======================================================================= -->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1331<h3>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]1332 <a name="sparc-be">Known problems with the SPARC back-end</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1333</h3>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]1334
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]1335<div>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]1336
1337<ul>
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1338 <li>The SPARC backend only supports the 32-bit SPARC ABI (-m32); it does not
1339 support the 64-bit SPARC ABI (-m64).</li>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]1340</ul>
1341
1342</div>
1343
1344<!-- ======================================================================= -->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1345<h3>
Bruno Cardoso Lopes24eb3de2008-10-25 14:56:26 +0000[diff] [blame]1346 <a name="mips-be">Known problems with the MIPS back-end</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1347</h3>
Bruno Cardoso Lopes24eb3de2008-10-25 14:56:26 +0000[diff] [blame]1348
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]1349<div>
Bruno Cardoso Lopes24eb3de2008-10-25 14:56:26 +0000[diff] [blame]1350
1351<ul>
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1352 <li>64-bit MIPS targets are not supported yet.</li>
Bruno Cardoso Lopes24eb3de2008-10-25 14:56:26 +0000[diff] [blame]1353</ul>
1354
1355</div>
1356
1357<!-- ======================================================================= -->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1358<h3>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]1359 <a name="alpha-be">Known problems with the Alpha back-end</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1360</h3>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]1361
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]1362<div>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]1363
1364<ul>
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1365 <li>On 21164s, some rare FP arithmetic sequences which may trap do not have
1366 the appropriate nops inserted to ensure restartability.</li>
John Criswell3bdbd302005-11-08 21:11:33 +0000[diff] [blame]1367</ul>
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1368
John Criswell3bdbd302005-11-08 21:11:33 +0000[diff] [blame]1369</div>
1370
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]1371<!-- ======================================================================= -->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1372<h3>
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]1373 <a name="c-be">Known problems with the C back-end</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1374</h3>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]1375
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]1376<div>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]1377
Chris Lattner086d2692010-09-29 05:34:42 +0000[diff] [blame]1378<p>The C backend has numerous problems and is not being actively maintained.
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1379 Depending on it for anything serious is not advised.</p>
Chris Lattner086d2692010-09-29 05:34:42 +0000[diff] [blame]1380
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]1381<ul>
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1382 <li><a href="http://llvm.org/PR802">The C backend has only basic support for
1383 inline assembly code</a>.</li>
1384
1385 <li><a href="http://llvm.org/PR1658">The C backend violates the ABI of common
1386 C++ programs</a>, preventing intermixing between C++ compiled by the CBE
1387 and C++ code compiled with <tt>llc</tt> or native compilers.</li>
1388
1389 <li>The C backend does not support all exception handling constructs.</li>
1390
1391 <li>The C backend does not support arbitrary precision integers.</li>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]1392</ul>
1393
1394</div>
John Criswell3bdbd302005-11-08 21:11:33 +0000[diff] [blame]1395
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]1396</div>
1397
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]1398<!-- *********************************************************************** -->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1399<h2>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]1400 <a name="additionalinfo">Additional Information</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1401</h2>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]1402<!-- *********************************************************************** -->
1403
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]1404<div>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]1405
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1406<p>A wide variety of additional information is available on
1407 the <a href="http://llvm.org/">LLVM web page</a>, in particular in
1408 the <a href="http://llvm.org/docs/">documentation</a> section. The web page
1409 also contains versions of the API documentation which is up-to-date with the
1410 Subversion version of the source code. You can access versions of these
1411 documents specific to this release by going into the "<tt>llvm/doc/</tt>"
1412 directory in the LLVM tree.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]1413
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]1414<p>If you have any questions or comments about LLVM, please feel free to contact
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1415 us via the <a href="http://llvm.org/docs/#maillist"> mailing lists</a>.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]1416
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]1417</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]1418
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