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gerrit-public.fairphone.software / fp2-dev / platform / external / llvm / 09c3253d3034ac8ed31f04d21181004827224d47 / . / 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
84 supporting tools), the Clang repository and the llvm-gcc repository. In
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
148 optimizers and code generators with LLVM's. Currently it requires a patched
149 version of gcc-4.5. The plugin can target the x86-32 and x86-64 processor
150 families and has been used successfully on the Darwin, FreeBSD and Linux
151 platforms. The Ada, C, C++ and Fortran languages work well. The plugin is
152 capable of compiling plenty of Obj-C, Obj-C++ and Java but it is not known
153 whether the compiled code actually works or not!</p>
Duncan Sands749fd832010-04-02 09:23:15 +0000[diff] [blame]154
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]155<p>The 3.0 release has the following notable changes:</p>
156
Duncan Sands4b1da2b2010-09-30 17:37:34 +0000[diff] [blame]157<ul>
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]158<!--
159<li></li>
160-->
Duncan Sands4b1da2b2010-09-30 17:37:34 +0000[diff] [blame]161</ul>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]162
163</div>
164
Chris Lattner75547712010-10-03 23:49:06 +0000[diff] [blame]165<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]166<h3>
Chris Lattner75547712010-10-03 23:49:06 +0000[diff] [blame]167<a name="compiler-rt">compiler-rt: Compiler Runtime Library</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]168</h3>
Chris Lattner75547712010-10-03 23:49:06 +0000[diff] [blame]169
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]170<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]171
172<p>The new LLVM <a href="http://compiler-rt.llvm.org/">compiler-rt project</a>
173 is a simple library that provides an implementation of the low-level
174 target-specific hooks required by code generation and other runtime
175 components. For example, when compiling for a 32-bit target, converting a
176 double to a 64-bit unsigned integer is compiled into a runtime call to the
177 "__fixunsdfdi" function. The compiler-rt library provides highly optimized
178 implementations of this and other low-level routines (some are 3x faster than
179 the equivalent libgcc routines).</p>
Chris Lattner75547712010-10-03 23:49:06 +0000[diff] [blame]180
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]181<p>In the LLVM 3.0 timeframe,</p>
Chris Lattner75547712010-10-03 23:49:06 +0000[diff] [blame]182
183</div>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]184
185<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]186<h3>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]187<a name="lldb">LLDB: Low Level Debugger</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]188</h3>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]189
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]190<div>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]191
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]192<p>LLDB has advanced by leaps and bounds in the 3.0 timeframe. It is
193 dramatically more stable and useful, and includes both a
194 new <a href="http://lldb.llvm.org/tutorial.html">tutorial</a> and
195 a <a href="http://lldb.llvm.org/lldb-gdb.html">side-by-side comparison with
196 GDB</a>.</p>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]197
198</div>
199
200<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]201<h3>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]202<a name="libc++">libc++: C++ Standard Library</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]203</h3>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]204
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]205<div>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]206
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]207<p>Like compiler_rt, libc++ is now <a href="DeveloperPolicy.html#license">dual
208 licensed</a> under the MIT and UIUC license, allowing it to be used more
209 permissively.</p>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]210
211</div>
212
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]213
Chris Lattner3d6a80a2011-04-07 03:08:22 +0000[diff] [blame]214<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]215<h3>
Chris Lattner3d6a80a2011-04-07 03:08:22 +0000[diff] [blame]216<a name="LLBrowse">LLBrowse: IR Browser</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]217</h3>
Daniel Dunbar97b01a82010-10-04 17:39:47 +0000[diff] [blame]218
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]219<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]220
221<p><a href="http://llvm.org/svn/llvm-project/llbrowse/trunk/doc/LLBrowse.html">
222 LLBrowse</a> is an interactive viewer for LLVM modules. It can load any LLVM
223 module and displays its contents as an expandable tree view, facilitating an
224 easy way to inspect types, functions, global variables, or metadata nodes. It
225 is fully cross-platform, being based on the popular wxWidgets GUI
226 toolkit.</p>
227
Chris Lattner3d6a80a2011-04-07 03:08:22 +0000[diff] [blame]228</div>
229
230<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]231<h3>
Chris Lattner3d6a80a2011-04-07 03:08:22 +0000[diff] [blame]232<a name="vmkit">VMKit</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]233</h3>
Chris Lattner3d6a80a2011-04-07 03:08:22 +0000[diff] [blame]234
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]235<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]236
Chris Lattner3d6a80a2011-04-07 03:08:22 +0000[diff] [blame]237<p>The <a href="http://vmkit.llvm.org/">VMKit project</a> is an implementation
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]238 of a Java Virtual Machine (Java VM or JVM) that uses LLVM for static and
239 just-in-time compilation. As of LLVM 3.0, VMKit now supports generational
240 garbage collectors. The garbage collectors are provided by the MMTk
241 framework, and VMKit can be configured to use one of the numerous implemented
242 collectors of MMTk.</p>
243
Chris Lattner3d6a80a2011-04-07 03:08:22 +0000[diff] [blame]244</div>
245
246
Daniel Dunbar97b01a82010-10-04 17:39:47 +0000[diff] [blame]247<!--=========================================================================-->
Chris Lattner7a8e6c52011-04-05 18:38:45 +0000[diff] [blame]248<!--
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]249<h3>
Daniel Dunbar97b01a82010-10-04 17:39:47 +0000[diff] [blame]250<a name="klee">KLEE: A Symbolic Execution Virtual Machine</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]251</h3>
Daniel Dunbar97b01a82010-10-04 17:39:47 +0000[diff] [blame]252
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]253<div>
Daniel Dunbar97b01a82010-10-04 17:39:47 +0000[diff] [blame]254<p>
255<a href="http://klee.llvm.org/">KLEE</a> is a symbolic execution framework for
256programs in LLVM bitcode form. KLEE tries to symbolically evaluate "all" paths
257through the application and records state transitions that lead to fault
258states. This allows it to construct testcases that lead to faults and can even
259be used to verify some algorithms.
260</p>
261
Chris Lattnerbe2e1b52011-03-10 07:43:44 +0000[diff] [blame]262<p>UPDATE!</p>
Chris Lattner7a8e6c52011-04-05 18:38:45 +0000[diff] [blame]263</div>-->
Daniel Dunbar97b01a82010-10-04 17:39:47 +0000[diff] [blame]264
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]265</div>
Daniel Dunbar97b01a82010-10-04 17:39:47 +0000[diff] [blame]266
Chris Lattnerab68e9e2009-02-26 22:33:38 +0000[diff] [blame]267<!-- *********************************************************************** -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]268<h2>
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]269 <a name="externalproj">External Open Source Projects Using LLVM 3.0</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]270</h2>
Chris Lattnerab68e9e2009-02-26 22:33:38 +0000[diff] [blame]271<!-- *********************************************************************** -->
272
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]273<div>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]274
275<p>An exciting aspect of LLVM is that it is used as an enabling technology for
276 a lot of other language and tools projects. This section lists some of the
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]277 projects that have already been updated to work with LLVM 3.0.</p>
Chris Lattner75547712010-10-03 23:49:06 +0000[diff] [blame]278
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]279<!--=========================================================================-->
Bill Wendling7be6bc52011-10-26 00:17:54 +0000[diff] [blame]280<h3>AddressSanitizer</h3>
281
282<div>
283
284<p><a href="http://code.google.com/p/address-sanitizer/">AddressSanitizer</a>
285 uses compiler instrumentation and a specialized malloc library to find C/C++
286 bugs such as use-after-free and out-of-bound accesses to heap, stack, and
287 globals. The key feature of the tool is speed: the average slowdown
288 introduced by AddressSanitizer is less than 2x.</p>
289
290</div>
291
292<!--=========================================================================-->
Bill Wendling29817ea2011-10-26 00:14:36 +0000[diff] [blame]293<h3>ClamAV</h3>
294
295<div>
Bill Wendlingf2a78332011-10-25 01:01:42 +0000[diff] [blame]296
Bill Wendling29817ea2011-10-26 00:14:36 +0000[diff] [blame]297<p><a href="http://www.clamav.net">Clam AntiVirus</a> is an open source (GPL)
298 anti-virus toolkit for UNIX, designed especially for e-mail scanning on mail
299 gateways.</p>
300
301<p>Since version 0.96 it
302 has <a href="http://vrt-sourcefire.blogspot.com/2010/09/introduction-to-clamavs-low-level.html">bytecode
303 signatures</a> that allow writing detections for complex malware.</p>
304
305<p>It uses LLVM's JIT to speed up the execution of bytecode on X86, X86-64,
306 PPC32/64, falling back to its own interpreter otherwise. The git version was
307 updated to work with LLVM 3.0.</p>
308
309</div>
310
311<!--=========================================================================-->
Bill Wendling65d1f412011-10-26 18:23:06 +0000[diff] [blame]312<h3>clReflect</h3>
313
314<div>
315
316<p><a href="https://bitbucket.org/dwilliamson/clreflect">clReflect</a> is a C++
317 parser that uses clang/LLVM to derive a light-weight reflection database
318 suitable for use in game development. It comes with a very simple runtime
319 library for loading and querying the database, requiring no external
320 dependencies (including CRT), and an additional utility library for object
321 management and serialisation.</p>
322
323</div>
324
325<!--=========================================================================-->
Bill Wendlingf2a78332011-10-25 01:01:42 +0000[diff] [blame]326<!-- FIXME: Comment out
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]327<h3>Crack Programming Language</h3>
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]328
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]329<div>
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]330<p>
331<a href="http://code.google.com/p/crack-language/">Crack</a> aims to provide the
332ease of development of a scripting language with the performance of a compiled
333language. The language derives concepts from C++, Java and Python, incorporating
334object-oriented programming, operator overloading and strong typing.</p>
335</div>
Bill Wendlingf2a78332011-10-25 01:01:42 +0000[diff] [blame]336-->
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]337
338<!--=========================================================================-->
Bill Wendlingf9778192011-10-26 00:09:55 +0000[diff] [blame]339<h3>Glasgow Haskell Compiler (GHC)</h3>
340
341<div>
342
343<p>GHC is an open source, state-of-the-art programming suite for Haskell, a
344 standard lazy functional programming language. It includes an optimizing
345 static compiler generating good code for a variety of platforms, together
346 with an interactive system for convenient, quick development.</p>
347
348<p>GHC 7.0 and onwards include an LLVM code generator, supporting LLVM 2.8 and
349 later. Since LLVM 2.9, GHC now includes experimental support for the ARM
350 platform with LLVM 3.0.</p>
351
352</div>
353
354<!--=========================================================================-->
Bill Wendlingf62333d2011-10-25 20:35:31 +0000[diff] [blame]355<h3>gwXscript</h3>
356
357<div>
358
359<p><a href="http://botwars.tk/gwscript/">gwXscript</a> is an object oriented,
Bill Wendling7c38de22011-10-26 04:24:15 +0000[diff] [blame]360 aspect oriented programming language which can create both executables (ELF,
Bill Wendlingf62333d2011-10-25 20:35:31 +0000[diff] [blame]361 EXE) and shared libraries (DLL, SO, DYNLIB). The compiler is implemented in
362 its own language and translates scripts into LLVM-IR which can be optimized
363 and translated into native code by the LLVM framework. Source code in
364 gwScript contains definitions that expand the namespaces. So you can build
365 your project and simply 'plug out' features by removing a file. The remaining
366 project does not leave scars since you directly separate concerns by the
367 'template' feature of gwX. It is also possible to add new features to a
368 project by just adding files and without editing the original project. This
369 language is used for example to create games or content management systems
370 that should be extendable.</p>
371
372<p>gwXscript is strongly typed and offers comfort with its native types string,
373 hash and array. You can easily write new libraries in gwXscript or native
374 code. gwXscript is type safe and users should not be able to crash your
375 program or execute malicious code except code that is eating CPU time.</p>
376
377</div>
378
379<!--=========================================================================-->
Bill Wendling50cacc82011-10-26 22:55:18 +0000[diff] [blame]380<h3>include-what-you-use</h3>
381
382<div>
383
384<p><a href="http://code.google.com/p/include-what-you-use">include-what-you-use</a>
385 is a tool to ensure that a file directly <code>#include</code>s
386 all <code>.h</code> files that provide a symbol that the file uses. It also
387 removes superfluous <code>#include</code>s from source files.</p>
388
389</div>
390
391<!--=========================================================================-->
Bill Wendling57fd8762011-10-26 18:20:54 +0000[diff] [blame]392<h3>LanguageKit and Pragmatic Smalltalk</h3>
393
394<div>
395
396<p><a href="http://etoileos.com/etoile/features/languagekit/">LanguageKit</a> is
397 a framework for implementing dynamic languages sharing an object model with
398 Objective-C. It provides static and JIT compilation using LLVM along with
399 its own interpreter. Pragmatic Smalltalk is a dialect of Smalltalk, built on
400 top of LanguageKit, that interfaces directly with Objective-C, sharing the
401 same object representation and message sending behaviour. These projects are
402 developed as part of the &Eacute;toi&eacute; desktop environment.</p>
403
404</div>
405
406<!--=========================================================================-->
Bill Wendlingd4821b82011-10-26 00:16:17 +0000[diff] [blame]407<h3>Mono</h3>
408
409<div>
410
411<p>An open source, cross-platform implementation of C# and the CLR that is
412 binary compatible with Microsoft.NET. Has an optional, dynamically-loaded
413 LLVM code generation backend in Mini, the JIT compiler.</p>
414
415<p>Note that we use a Git mirror of LLVM with some patches. See:
416 https://github.com/mono/llvm</p>
417
418</div>
419
420<!--=========================================================================-->
Bill Wendlingba226272011-10-25 20:37:45 +0000[diff] [blame]421<h3>Portable OpenCL (pocl)</h3>
422
423<div>
424
425<p>Portable OpenCL is an open source implementation of the OpenCL standard which
426 can be easily adapted for new targets. One of the goals of the project is
427 improving performance portability of OpenCL programs, avoiding the need for
428 target-dependent manual optimizations. A "native" target is included, which
429 allows running OpenCL kernels on the host (CPU).</p>
430
431</div>
432
433<!--=========================================================================-->
Bill Wendling0bad98c2011-10-25 20:39:06 +0000[diff] [blame]434<h3>Pure</h3>
435
436<div>
437<p><a href="http://pure-lang.googlecode.com/">Pure</a> is an
438 algebraic/functional programming language based on term rewriting. Programs
439 are collections of equations which are used to evaluate expressions in a
440 symbolic fashion. The interpreter uses LLVM as a backend to JIT-compile Pure
441 programs to fast native code. Pure offers dynamic typing, eager and lazy
442 evaluation, lexical closures, a hygienic macro system (also based on term
443 rewriting), built-in list and matrix support (including list and matrix
444 comprehensions) and an easy-to-use interface to C and other programming
445 languages (including the ability to load LLVM bitcode modules, and inline C,
446 C++, Fortran and Faust code in Pure programs if the corresponding LLVM-enabled
447 compilers are installed).</p>
448
449<p>Pure version 0.48 has been tested and is known to work with LLVM 3.0
450 (and continues to work with older LLVM releases &gt;= 2.5).</p>
451
452</div>
453
454<!--=========================================================================-->
Bill Wendling537d85b2011-10-26 00:12:04 +0000[diff] [blame]455<h3>Renderscript</h3>
456
457<div>
458
459<p><a href="http://developer.android.com/guide/topics/renderscript/index.html">Renderscript</a>
460 is Android's advanced 3D graphics rendering and compute API. It provides a
461 portable C99-based language with extensions to facilitate common use cases
462 for enhancing graphics and thread level parallelism. The Renderscript
463 compiler frontend is based on Clang/LLVM. It emits a portable bitcode format
464 for the actual compiled script code, as well as reflects a Java interface for
465 developers to control the execution of the compiled bitcode. Executable
466 machine code is then generated from this bitcode by an LLVM backend on the
467 device. Renderscript is thus able to provide a mechanism by which Android
468 developers can improve performance of their applications while retaining
469 portability.</p>
470
471</div>
472
473<!--=========================================================================-->
Bill Wendling7d5b6212011-10-25 20:40:26 +0000[diff] [blame]474<h3>SAFECode</h3>
475
476<div>
477
478<p><a href="http://safecode.cs.illinois.edu">SAFECode</a> is a memory safe C/C++
479 compiler built using LLVM. It takes standard, unannotated C/C++ code,
480 analyzes the code to ensure that memory accesses and array indexing
481 operations are safe, and instruments the code with run-time checks when
482 safety cannot be proven statically. SAFECode can be used as a debugging aid
483 (like Valgrind) to find and repair memory safety bugs. It can also be used
484 to protect code from security attacks at run-time.</p>
485
486</div>
487
488<!--=========================================================================-->
Bill Wendling02b77b72011-10-26 07:38:19 +0000[diff] [blame]489<h3>The Stupid D Compiler (SDC)</h3>
490
491<div>
492
493<p><a href="https://github.com/bhelyer/SDC">The Stupid D Compiler</a> is a
494 project seeking to write a self-hosting compiler for the D programming
495 language without using the frontend of the reference compiler (DMD).</p>
496
497</div>
498
499<!--=========================================================================-->
Bill Wendling2d7b4af2011-10-25 20:24:32 +0000[diff] [blame]500<h3>TTA-based Co-design Environment (TCE)</h3>
501
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]502<div>
Bill Wendling2d7b4af2011-10-25 20:24:32 +0000[diff] [blame]503
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]504<p>TCE is a toolset for designing application-specific processors (ASP) based on
Bill Wendling2d7b4af2011-10-25 20:24:32 +0000[diff] [blame]505 the Transport triggered architecture (TTA). The toolset provides a complete
506 co-design flow from C/C++ programs down to synthesizable VHDL and parallel
507 program binaries. Processor customization points include the register files,
508 function units, supported operations, and the interconnection network.</p>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]509
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]510<p>TCE uses Clang and LLVM for C/C++ language support, target independent
Bill Wendling2d7b4af2011-10-25 20:24:32 +0000[diff] [blame]511 optimizations and also for parts of code generation. It generates new
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]512 LLVM-based code generators "on the fly" for the designed TTA processors and
513 loads them in to the compiler backend as runtime libraries to avoid
Bill Wendling2d7b4af2011-10-25 20:24:32 +0000[diff] [blame]514 per-target recompilation of larger parts of the compiler chain.</p>
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]515
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]516</div>
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]517
518<!--=========================================================================-->
Bill Wendling628c2662011-10-25 20:27:37 +0000[diff] [blame]519<h3>Tart Programming Language</h3>
520
521<div>
522
523<p><a href="http://code.google.com/p/tart/">Tart</a> is a general-purpose,
524 strongly typed programming language designed for application
525 developers. Strongly inspired by Python and C#, Tart focuses on practical
526 solutions for the professional software developer, while avoiding the clutter
527 and boilerplate of legacy languages like Java and C++. Although Tart is still
528 in development, the current implementation supports many features expected of
529 a modern programming language, such as garbage collection, powerful
530 bidirectional type inference, a greatly simplified syntax for template
531 metaprogramming, closures and function literals, reflection, operator
532 overloading, explicit mutability and immutability, and much more. Tart is
533 flexible enough to accommodate a broad range of programming styles and
534 philosophies, while maintaining a strong commitment to simplicity, minimalism
535 and elegance in design.</p>
536
537</div>
538
539<!--=========================================================================-->
Bill Wendling644ce532011-10-26 09:25:01 +0000[diff] [blame]540<h3>ThreadSanitizer</h3>
541
542<div>
543
544<p><a href="http://code.google.com/p/data-race-test/">ThreadSanitizer</a> is a
545 data race detector for (mostly) C and C++ code, available for Linux, Mac OS
546 and Windows. On different systems, we use binary instrumentation frameworks
547 (Valgrind, Pin and DynamoRio) as frontends that generate the program events
548 for the race detection algorithm. On Linux, there's an option of using
549 LLVM-based compile-time instrumentation.</p>
550
551</div>
552
553<!--=========================================================================-->
Bill Wendling8a924c62011-10-26 07:42:45 +0000[diff] [blame]554<h3>The ZooLib C++ Cross-Platform Application Framework</h3>
555
556<div>
557
558<p><a href="http://www.zoolib.org/">ZooLib</a> is Open Source under the MIT
559 License. It provides GUI, filesystem access, TCP networking, thread-safe
560 memory management, threading and locking for Mac OS X, Classic Mac OS,
561 Microsoft Windows, POSIX operating systems with X11, BeOS, Haiku, Apple's iOS
562 and Research in Motion's BlackBerry.</p>
563
564<p>My current work is to use CLang's static analyzer to improve ZooLib's code
565 quality. I also plan to set up LLVM compiles of the demo programs and test
566 programs using CLang and LLVM on all the platforms that CLang, LLVM and
567 ZooLib all support.</p>
568
569</div>
570
571<!--=========================================================================-->
Bill Wendlingf2a78332011-10-25 01:01:42 +0000[diff] [blame]572<!--
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]573<h3>PinaVM</h3>
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]574
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]575<div>
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]576<p><a href="http://gitorious.org/pinavm/pages/Home">PinaVM</a> is an open
577source, <a href="http://www.systemc.org/">SystemC</a> front-end. Unlike many
578other front-ends, PinaVM actually executes the elaboration of the
579program analyzed using LLVM's JIT infrastructure. It later enriches the
580bitcode with SystemC-specific information.</p>
581</div>
Bill Wendlingf2a78332011-10-25 01:01:42 +0000[diff] [blame]582-->
583
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]584
585<!--=========================================================================-->
Bill Wendlingf2a78332011-10-25 01:01:42 +0000[diff] [blame]586<!--
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]587<h3 id="icedtea">IcedTea Java Virtual Machine Implementation</h3>
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]588
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]589<div>
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]590<p>
591<a href="http://icedtea.classpath.org/wiki/Main_Page">IcedTea</a> provides a
592harness to build OpenJDK using only free software build tools and to provide
593replacements for the not-yet free parts of OpenJDK. One of the extensions that
594IcedTea provides is a new JIT compiler named <a
595href="http://icedtea.classpath.org/wiki/ZeroSharkFaq">Shark</a> which uses LLVM
596to provide native code generation without introducing processor-dependent
597code.
598</p>
599
600<p> OpenJDK 7 b112, IcedTea6 1.9 and IcedTea7 1.13 and later have been tested
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]601and are known to work with LLVM 3.0 (and continue to work with older LLVM
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]602releases &gt;= 2.6 as well).</p>
603</div>
Bill Wendlingf2a78332011-10-25 01:01:42 +0000[diff] [blame]604-->
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]605
606<!--=========================================================================-->
Bill Wendlingf2a78332011-10-25 01:01:42 +0000[diff] [blame]607<!--
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]608<h3>Polly - Polyhedral optimizations for LLVM</h3>
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]609
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]610<div>
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]611<p>Polly is a project that aims to provide advanced memory access optimizations
612to better take advantage of SIMD units, cache hierarchies, multiple cores or
613even vector accelerators for LLVM. Built around an abstract mathematical
614description based on Z-polyhedra, it provides the infrastructure to develop
615advanced optimizations in LLVM and to connect complex external optimizers. In
616its first year of existence Polly already provides an exact value-based
617dependency analysis as well as basic SIMD and OpenMP code generation support.
618Furthermore, Polly can use PoCC(Pluto) an advanced optimizer for data-locality
619and parallelism.</p>
620</div>
Bill Wendlingf2a78332011-10-25 01:01:42 +0000[diff] [blame]621-->
Chris Lattner75547712010-10-03 23:49:06 +0000[diff] [blame]622
Chris Lattner0fa5da92011-04-06 16:14:25 +0000[diff] [blame]623<!--=========================================================================-->
Bill Wendlingf2a78332011-10-25 01:01:42 +0000[diff] [blame]624<!--
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]625<h3>Rubinius</h3>
Chris Lattner0fa5da92011-04-06 16:14:25 +0000[diff] [blame]626
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]627<div>
Chris Lattner0fa5da92011-04-06 16:14:25 +0000[diff] [blame]628 <p><a href="http://github.com/evanphx/rubinius">Rubinius</a> is an environment
629 for running Ruby code which strives to write as much of the implementation in
630 Ruby as possible. Combined with a bytecode interpreting VM, it uses LLVM to
631 optimize and compile ruby code down to machine code. Techniques such as type
632 feedback, method inlining, and deoptimization are all used to remove dynamism
633 from ruby execution and increase performance.</p>
634</div>
Bill Wendlingf2a78332011-10-25 01:01:42 +0000[diff] [blame]635-->
Chris Lattner0fa5da92011-04-06 16:14:25 +0000[diff] [blame]636
Chris Lattnera844a3e2011-04-07 03:09:21 +0000[diff] [blame]637<!--=========================================================================-->
Bill Wendlingf2a78332011-10-25 01:01:42 +0000[diff] [blame]638<!--
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]639<h3>
Chris Lattnera844a3e2011-04-07 03:09:21 +0000[diff] [blame]640<a name="FAUST">FAUST Real-Time Audio Signal Processing Language</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]641</h3>
Chris Lattnere0518442010-10-01 06:34:49 +0000[diff] [blame]642
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]643<div>
Chris Lattnera844a3e2011-04-07 03:09:21 +0000[diff] [blame]644<p>
645<a href="http://faust.grame.fr">FAUST</a> is a compiled language for real-time
646audio signal processing. The name FAUST stands for Functional AUdio STream. Its
647programming model combines two approaches: functional programming and block
648diagram composition. In addition with the C, C++, JAVA output formats, the
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]649Faust compiler can now generate LLVM bitcode, and works with LLVM 2.7-3.0.</p>
Chris Lattnera844a3e2011-04-07 03:09:21 +0000[diff] [blame]650
651</div>
Bill Wendlingf2a78332011-10-25 01:01:42 +0000[diff] [blame]652-->
Chris Lattnera844a3e2011-04-07 03:09:21 +0000[diff] [blame]653
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]654</div>
655
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]656<!-- *********************************************************************** -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]657<h2>
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]658 <a name="whatsnew">What's New in LLVM 3.0?</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]659</h2>
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]660<!-- *********************************************************************** -->
661
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]662<div>
Chris Lattnerf8e0b4e2008-06-08 22:59:35 +0000[diff] [blame]663
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]664<p>This release includes a huge number of bug fixes, performance tweaks and
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]665 minor improvements. Some of the major improvements and new features are
666 listed in this section.</p>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]667
Chris Lattner914ce462010-04-22 06:28:20 +0000[diff] [blame]668<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]669<h3>
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]670<a name="majorfeatures">Major New Features</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]671</h3>
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]672
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]673<div>
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]674
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]675<p>LLVM 3.0 includes several major new capabilities:</p>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]676
677<ul>
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]678
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]679<!--
680<li></li>
681-->
Chris Lattner7a8e6c52011-04-05 18:38:45 +0000[diff] [blame]682
Chris Lattner8170c102008-02-10 08:18:42 +0000[diff] [blame]683</ul>
Chris Lattner0a6f6d52011-04-05 07:19:28 +0000[diff] [blame]684
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]685</div>
686
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]687<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]688<h3>
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]689<a name="coreimprovements">LLVM IR and Core Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]690</h3>
Chris Lattnerf304ffc2008-02-10 08:17:19 +0000[diff] [blame]691
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]692<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]693
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]694<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]695 expose new optimization opportunities:</p>
Chris Lattnerf304ffc2008-02-10 08:17:19 +0000[diff] [blame]696
Bill Wendlingbc5f6dd2011-10-26 18:33:01 +0000[diff] [blame]697<p>One of the biggest changes is that 3.0 has a new exception handling
698 system. The old system used LLVM intrinsics to convey the exception handling
699 information to the code generator. It worked in most cases, but not
700 all. Inlining was especially difficult to get right. Also, the intrinsics
701 could be moved away from the <code>invoke</code> instruction, making it hard
702 to recover that information.</p>
703
704<p>The new EH system makes exception handling a first-class member of the IR. It
705 adds two new instructions:</p>
706
Chris Lattner791f77b2008-06-05 06:25:56 +0000[diff] [blame]707<ul>
Bill Wendlingbc5f6dd2011-10-26 18:33:01 +0000[diff] [blame]708 <li><a href="LangRef.html#i_landingpad"><code>landingpad</code></a> &mdash;
709 this instruction defines a landing pad basic block. It contains all of the
710 information that's needed by the code generator. It's also required to be
711 the first non-PHI instruction in the landing pad. In addition, a landing
712 pad may be jumped to only by the unwind edge of an <code>invoke</code>
713 instruction.</li>
714
715 <li><a href="LangRef.html#i_resume"><code>resume</code></a> &mdash; this
716 instruction causes the current exception to resume traveling up the
717 stack. It replaces the <code>@llvm.eh.resume</code> intrinsic.</li>
Chris Lattnerf304ffc2008-02-10 08:17:19 +0000[diff] [blame]718</ul>
Mikhail Glushenkovea65d7d2008-10-13 02:08:34 +0000[diff] [blame]719
Bill Wendlingbc5f6dd2011-10-26 18:33:01 +0000[diff] [blame]720<p>Converting from the old EH API to the new EH API is rather simple, because a
721 lot of complexity has been removed. The two intrinsics,
722 <code>@llvm.eh.exception</code> and <code>@llvm.eh.selector</code> have been
723 superceded by the <code>landingpad</code> instruction. Instead of generating
724 a call to <code>@llvm.eh.exception</code> and <code>@llvm.eh.selector</code>:
725
726<div class="doc_code">
727<pre>
728Function *ExcIntr = Intrinsic::getDeclaration(TheModule,
729 Intrinsic::eh_exception);
730Function *SlctrIntr = Intrinsic::getDeclaration(TheModule,
731 Intrinsic::eh_selector);
732
733// The exception pointer.
734Value *ExnPtr = Builder.CreateCall(ExcIntr, "exc_ptr");
735
736std::vector&lt;Value*&gt; Args;
737Args.push_back(ExnPtr);
738Args.push_back(Builder.CreateBitCast(Personality,
739 Type::getInt8PtrTy(Context)));
740
741<i>// Add selector clauses to Args.</i>
742
743// The selector call.
744Builder.CreateCall(SlctrIntr, Args, "exc_sel");
745</pre>
746</div>
747
748<p>You should instead generate a <code>landingpad</code> instruction, that
749 returns an exception object and selector value:</p>
750
751<div class="doc_code">
752<pre>
753LandingPadInst *LPadInst =
754 Builder.CreateLandingPad(StructType::get(Int8PtrTy, Int32Ty, NULL),
755 Personality, 0);
756
757Value *LPadExn = Builder.CreateExtractValue(LPadInst, 0);
758Builder.CreateStore(LPadExn, getExceptionSlot());
759
760Value *LPadSel = Builder.CreateExtractValue(LPadInst, 1);
761Builder.CreateStore(LPadSel, getEHSelectorSlot());
762</pre>
763</div>
764
765<p>It's now trivial to add the individual clauses to the <code>landingpad</code>
766 instruction.</p>
767
768<div class="doc_code">
769<pre>
770<i><b>// Adding a catch clause</b></i>
771Constant *TypeInfo = getTypeInfo();
772LPadInst-&gt;addClause(TypeInfo);
773
774<i><b>// Adding a C++ catch-all</b></i>
775LPadInst-&gt;addClause(Constant::getNullValue(Builder.getInt8PtrTy()));
776
777<i><b>// Adding a cleanup</b></i>
778LPadInst-&gt;setCleanup(true);
779
780<i><b>// Adding a filter clause</b></i>
781std::vector&lt;Constant*&gt; TypeInfos;
782Constant *TypeInfo = getFilterTypeInfo();
783TypeInfos.push_back(Builder.CreateBitCast(TypeInfo, Builder.getInt8PtrTy()));
784
785ArrayType *FilterTy = ArrayType::get(Int8PtrTy, TypeInfos.size());
786LPadInst-&gt;addClause(ConstantArray::get(FilterTy, TypeInfos));
787</pre>
788</div>
789
790<p>Converting from using the <code>@llvm.eh.resume</code> intrinsic to
791 the <code>resume</code> instruction is trivial. It takes the exception
792 pointer and exception selector values returned by
793 the <code>landingpad</code> instruction:</p>
794
795<div class="doc_code">
796<pre>
797Type *UnwindDataTy = StructType::get(Builder.getInt8PtrTy(),
798 Builder.getInt32Ty(), NULL);
799Value *UnwindData = UndefValue::get(UnwindDataTy);
800Value *ExcPtr = Builder.CreateLoad(getExceptionObjSlot());
801Value *ExcSel = Builder.CreateLoad(getExceptionSelSlot());
802UnwindData = Builder.CreateInsertValue(UnwindData, ExcPtr, 0, "exc_ptr");
803UnwindData = Builder.CreateInsertValue(UnwindData, ExcSel, 1, "exc_sel");
804Builder.CreateResume(UnwindData);
805</pre>
806</div>
807
Chris Lattnerf304ffc2008-02-10 08:17:19 +0000[diff] [blame]808</div>
809
810<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]811<h3>
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]812<a name="optimizer">Optimizer Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]813</h3>
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]814
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]815<div>
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]816
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]817<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]818 release includes a few major enhancements and additions to the
819 optimizers:</p>
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]820
821<ul>
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]822<!--
823<li></li>
824-->
Chris Lattnerc5ac61d2011-04-06 05:50:04 +0000[diff] [blame]825</li>
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]826
Chris Lattner11b66112010-10-04 02:42:39 +0000[diff] [blame]827</ul>
828
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]829</div>
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]830
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]831<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]832<h3>
Chris Lattner4ba2b652010-09-30 16:31:33 +0000[diff] [blame]833<a name="mc">MC Level Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]834</h3>
Chris Lattner4ba2b652010-09-30 16:31:33 +0000[diff] [blame]835
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]836<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]837
838<p>The LLVM Machine Code (aka MC) subsystem was created to solve a number of
839 problems in the realm of assembly, disassembly, object file format handling,
840 and a number of other related areas that CPU instruction-set level tools work
841 in.</p>
Chris Lattner7d9b6b42010-10-02 21:59:30 +0000[diff] [blame]842
Chris Lattner7d9b6b42010-10-02 21:59:30 +0000[diff] [blame]843<ul>
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]844<!--
845<li></li>
846-->
Chris Lattner7d9b6b42010-10-02 21:59:30 +0000[diff] [blame]847</ul>
848
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]849<p>For more information, please see
850 the <a href="http://blog.llvm.org/2010/04/intro-to-llvm-mc-project.html">Intro
851 to the LLVM MC Project Blog Post</a>.</p>
Chris Lattner4ba2b652010-09-30 16:31:33 +0000[diff] [blame]852
NAKAMURA Takumi45c435a2011-04-05 08:24:22 +0000[diff] [blame]853</div>
Chris Lattner4ba2b652010-09-30 16:31:33 +0000[diff] [blame]854
Chris Lattner4ba2b652010-09-30 16:31:33 +0000[diff] [blame]855<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]856<h3>
Chris Lattner511433e2009-03-02 03:24:11 +0000[diff] [blame]857<a name="codegen">Target Independent Code Generator Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]858</h3>
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]859
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]860<div>
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]861
Mikhail Glushenkovf795ef02009-03-01 18:09:47 +0000[diff] [blame]862<p>We have put a significant amount of work into the code generator
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]863 infrastructure, which allows us to implement more aggressive algorithms and
864 make it run faster:</p>
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]865
866<ul>
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]867<!--
868<li></li>
869-->
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]870</ul>
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]871</div>
872
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]873<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]874<h3>
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]875<a name="x86">X86-32 and X86-64 Target Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]876</h3>
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]877
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]878<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]879
880<p>New features and major changes in the X86 target include:</p>
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]881
882<ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]883
884 <li>The CRC32 intrinsics have been renamed. The intrinsics were previously
885 <code>@llvm.x86.sse42.crc32.[8|16|32]</code>
886 and <code>@llvm.x86.sse42.crc64.[8|64]</code>. They have been renamed to
887 <code>@llvm.x86.sse42.crc32.32.[8|16|32]</code> and
888 <code>@llvm.x86.sse42.crc32.64.[8|64]</code>.</li>
Chad Rosierf94c9c12011-05-27 20:13:10 +0000[diff] [blame]889
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]890</ul>
891
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]892</div>
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]893
894<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]895<h3>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]896<a name="ARM">ARM Target Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]897</h3>
Chris Lattnerc441fb82009-03-01 02:30:21 +0000[diff] [blame]898
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]899<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]900
901<p>New features of the ARM target include:</p>
Chris Lattnerc441fb82009-03-01 02:30:21 +0000[diff] [blame]902
903<ul>
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]904<!--
905<li></li>
906-->
Bob Wilsone8472772010-09-13 17:39:35 +0000[diff] [blame]907</ul>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]908</div>
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]909
910<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]911<h3>
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]912<a name="OtherTS">Other Target Specific Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]913</h3>
Chris Lattnerc441fb82009-03-01 02:30:21 +0000[diff] [blame]914
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]915<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]916
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]917<ul>
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]918<!--
919<li></li>
920-->
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]921</ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]922
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]923</div>
Chris Lattner77d29b12008-06-05 08:02:49 +0000[diff] [blame]924
925<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]926<h3>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]927<a name="changes">Major Changes and Removed Features</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]928</h3>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]929
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]930<div>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]931
Bill Wendling2626dba2011-08-03 22:18:20 +0000[diff] [blame]932<p>If you're already an LLVM user or developer with out-of-tree changes based on
933 LLVM 2.9, this section lists some "gotchas" that you may run into upgrading
934 from the previous release.</p>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]935
936<ul>
Eric Christopher90d6ec52011-09-28 19:47:28 +0000[diff] [blame]937 <li>The <code>LLVMC</code> front end code was removed while separating
938 out language independence.</li>
Jay Foadf42e9b22011-08-04 10:43:43 +0000[diff] [blame]939 <li>The <code>LowerSetJmp</code> pass wasn't used effectively by any
940 target and has been removed.</li>
Rafael Espindolaf940a1a2011-08-30 23:03:45 +0000[diff] [blame]941 <li>The old <code>TailDup</code> pass was not used in the standard pipeline
942 and was unable to update ssa form, so it has been removed.
Eli Friedmanf03bb262011-08-12 22:50:01 +0000[diff] [blame]943 <li>The syntax of volatile loads and stores in IR has been changed to
944 "<code>load volatile</code>"/"<code>store volatile</code>". The old
945 syntax ("<code>volatile load</code>"/"<code>volatile store</code>")
946 is still accepted, but is now considered deprecated.</li>
Eli Friedman526e1bb2011-10-26 00:55:23 +0000[diff] [blame]947 <li>The old atomic intrinscs (<code>llvm.memory.barrier</code> and
948 <code>llvm.atomic.*</code>) are now gone. Please use the new atomic
949 instructions, described in the <a href="Atomics.html">atomics guide</a>.
Devang Patelb34dd132008-10-14 20:03:43 +0000[diff] [blame]950</ul>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]951
NAKAMURA Takumi2026de22011-08-22 23:22:05 +0000[diff] [blame]952<h4>Windows (32-bit)</h4>
953<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]954
NAKAMURA Takumi2026de22011-08-22 23:22:05 +0000[diff] [blame]955<ul>
956 <li>On Win32(MinGW32 and MSVC), Windows 2000 will not be supported.
957 Windows XP or higher is required.</li>
958</ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]959
NAKAMURA Takumi2026de22011-08-22 23:22:05 +0000[diff] [blame]960</div>
961
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]962</div>
963
Daniel Dunbarf0233c62010-10-04 20:11:41 +0000[diff] [blame]964<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]965<h3>
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]966<a name="api_changes">Internal API Changes</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]967</h3>
Daniel Dunbarf0233c62010-10-04 20:11:41 +0000[diff] [blame]968
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]969<div>
Daniel Dunbarf0233c62010-10-04 20:11:41 +0000[diff] [blame]970
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]971<p>In addition, many APIs have changed in this release. Some of the major
Bill Wendling16005252011-08-02 06:20:17 +0000[diff] [blame]972 LLVM API changes are:</p>
Daniel Dunbarf0233c62010-10-04 20:11:41 +0000[diff] [blame]973
974<ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]975 <li>The biggest and most pervasive change is that llvm::Type's are no longer
976 returned or accepted as 'const' values. Instead, just pass around
977 non-const Type's.</li>
Chris Lattnerd1324302011-07-18 04:56:02 +0000[diff] [blame]978
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]979 <li><code>PHINode::reserveOperandSpace</code> has been removed. Instead, you
980 must specify how many operands to reserve space for when you create the
981 PHINode, by passing an extra argument
982 into <code>PHINode::Create</code>.</li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]983
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]984 <li>PHINodes no longer store their incoming BasicBlocks as operands. Instead,
985 the list of incoming BasicBlocks is stored separately, and can be accessed
986 with new functions <code>PHINode::block_begin</code>
987 and <code>PHINode::block_end</code>.</li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]988
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]989 <li>Various functions now take an <code>ArrayRef</code> instead of either a
990 pair of pointers (or iterators) to the beginning and end of a range, or a
991 pointer and a length. Others now return an <code>ArrayRef</code> instead
992 of a reference to a <code>SmallVector</code>
993 or <code>std::vector</code>. These include:
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]994<ul>
995<!-- Please keep this list sorted. -->
Jay Foada3efbb12011-07-15 08:37:34 +0000[diff] [blame]996<li><code>CallInst::Create</code></li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]997<li><code>ComputeLinearIndex</code> (in <code>llvm/CodeGen/Analysis.h</code>)</li>
998<li><code>ConstantArray::get</code></li>
999<li><code>ConstantExpr::getExtractElement</code></li>
Jay Foaddab3d292011-07-21 14:31:17 +0000[diff] [blame]1000<li><code>ConstantExpr::getGetElementPtr</code></li>
1001<li><code>ConstantExpr::getInBoundsGetElementPtr</code></li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]1002<li><code>ConstantExpr::getIndices</code></li>
1003<li><code>ConstantExpr::getInsertElement</code></li>
1004<li><code>ConstantExpr::getWithOperands</code></li>
Jay Foad1d2f5692011-07-19 13:32:40 +0000[diff] [blame]1005<li><code>ConstantFoldCall</code> (in <code>llvm/Analysis/ConstantFolding.h</code>)</li>
1006<li><code>ConstantFoldInstOperands</code> (in <code>llvm/Analysis/ConstantFolding.h</code>)</li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]1007<li><code>ConstantVector::get</code></li>
1008<li><code>DIBuilder::createComplexVariable</code></li>
1009<li><code>DIBuilder::getOrCreateArray</code></li>
1010<li><code>ExtractValueInst::Create</code></li>
1011<li><code>ExtractValueInst::getIndexedType</code></li>
1012<li><code>ExtractValueInst::getIndices</code></li>
1013<li><code>FindInsertedValue</code> (in <code>llvm/Analysis/ValueTracking.h</code>)</li>
Jay Foadca12a212011-07-19 14:42:50 +0000[diff] [blame]1014<li><code>gep_type_begin</code> (in <code>llvm/Support/GetElementPtrTypeIterator.h</code>)</li>
1015<li><code>gep_type_end</code> (in <code>llvm/Support/GetElementPtrTypeIterator.h</code>)</li>
Jay Foada9203102011-07-25 09:48:08 +0000[diff] [blame]1016<li><code>GetElementPtrInst::Create</code></li>
1017<li><code>GetElementPtrInst::CreateInBounds</code></li>
1018<li><code>GetElementPtrInst::getIndexedType</code></li>
Jay Foadb60e8512011-07-21 14:42:51 +0000[diff] [blame]1019<li><code>InsertValueInst::Create</code></li>
1020<li><code>InsertValueInst::getIndices</code></li>
1021<li><code>InvokeInst::Create</code></li>
Jay Foada3efbb12011-07-15 08:37:34 +0000[diff] [blame]1022<li><code>IRBuilder::CreateCall</code></li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]1023<li><code>IRBuilder::CreateExtractValue</code></li>
Jay Foad0a2a60a2011-07-22 08:16:57 +0000[diff] [blame]1024<li><code>IRBuilder::CreateGEP</code></li>
1025<li><code>IRBuilder::CreateInBoundsGEP</code></li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]1026<li><code>IRBuilder::CreateInsertValue</code></li>
Jay Foada3efbb12011-07-15 08:37:34 +0000[diff] [blame]1027<li><code>IRBuilder::CreateInvoke</code></li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]1028<li><code>MDNode::get</code></li>
1029<li><code>MDNode::getIfExists</code></li>
1030<li><code>MDNode::getTemporary</code></li>
1031<li><code>MDNode::getWhenValsUnresolved</code></li>
Jay Foadb9b54eb2011-07-19 15:07:52 +0000[diff] [blame]1032<li><code>SimplifyGEPInst</code> (in <code>llvm/Analysis/InstructionSimplify.h</code>)</li>
Jay Foad8fbbb392011-07-19 14:01:37 +0000[diff] [blame]1033<li><code>TargetData::getIndexedOffset</code></li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]1034</ul></li>
1035
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1036 <li>All forms of <code>StringMap::getOrCreateValue</code> have been remove
1037 except for the one which takes a <code>StringRef</code>.</li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]1038
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1039 <li>The <code>LLVMBuildUnwind</code> function from the C API was removed. The
1040 LLVM <code>unwind</code> instruction has been deprecated for a long time
1041 and isn't used by the current front-ends. So this was removed during the
1042 exception handling rewrite.</li>
Bill Wendling16005252011-08-02 06:20:17 +0000[diff] [blame]1043
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1044 <li>The <code>LLVMAddLowerSetJmpPass</code> function from the C API was
1045 removed because the <code>LowerSetJmp</code> pass was removed.</li>
Bill Wendling2626dba2011-08-03 22:18:20 +0000[diff] [blame]1046
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1047 <li>The <code>DIBuilder</code> interface used by front ends to encode
1048 debugging information in the LLVM IR now expects clients to
1049 use <code>DIBuilder::finalize()</code> at the end of translation unit to
1050 complete debugging information encoding.</li>
Devang Patel6326a422011-08-15 23:00:00 +0000[diff] [blame]1051
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1052 <li>The way the type system works has been
1053 rewritten: <code>PATypeHolder</code> and <code>OpaqueType</code> are gone,
1054 and all APIs deal with <code>Type*</code> instead of <code>const
1055 Type*</code>. If you need to create recursive structures, then create a
1056 named structure, and use <code>setBody()</code> when all its elements are
1057 built. Type merging and refining is gone too: named structures are not
1058 merged with other structures, even if their layout is identical. (of
1059 course anonymous structures are still uniqued by layout).</li>
Torok Edwinf16e2d42011-09-30 13:07:52 +0000[diff] [blame]1060
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1061 <li>TargetSelect.h moved to Support/ from Target/</li>
Torok Edwinf16e2d42011-09-30 13:07:52 +0000[diff] [blame]1062
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1063 <li>UpgradeIntrinsicCall no longer upgrades pre-2.9 intrinsic calls (for
1064 example <code>llvm.memset.i32</code>).</li>
Torok Edwinf16e2d42011-09-30 13:07:52 +0000[diff] [blame]1065
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1066 <li>It is mandatory to initialize all out-of-tree passes too and their dependencies now with
1067 <code>INITIALIZE_PASS{BEGIN,END,}</code>
1068 and <code>INITIALIZE_{PASS,AG}_DEPENDENCY</code>.</li>
Torok Edwinf16e2d42011-09-30 13:07:52 +0000[diff] [blame]1069
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1070 <li>The interface for MemDepResult in MemoryDependenceAnalysis has been
1071 enhanced with new return types Unknown and NonFuncLocal, in addition to
1072 the existing types Clobber, Def, and NonLocal.</li>
Daniel Dunbarf0233c62010-10-04 20:11:41 +0000[diff] [blame]1073</ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1074
Daniel Dunbarf0233c62010-10-04 20:11:41 +0000[diff] [blame]1075</div>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]1076
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1077</div>
1078
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1079<!-- *********************************************************************** -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1080<h2>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1081 <a name="knownproblems">Known Problems</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1082</h2>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1083<!-- *********************************************************************** -->
1084
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1085<div>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1086
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1087<p>This section contains significant known problems with the LLVM system, listed
1088 by component. If you run into a problem, please check
1089 the <a href="http://llvm.org/bugs/">LLVM bug database</a> and submit a bug if
1090 there isn't already one.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1091
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]1092<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1093<h3>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]1094 <a name="experimental">Experimental features included with this release</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1095</h3>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1096
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1097<div>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]1098
Misha Brukman6df9e2c2004-05-12 21:46:05 +0000[diff] [blame]1099<p>The following components of this LLVM release are either untested, known to
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1100 be broken or unreliable, or are in early development. These components
1101 should not be relied on, and bugs should not be filed against them, but they
1102 may be useful to some people. In particular, if you would like to work on
1103 one of these components, please contact us on
1104 the <a href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVMdev
1105 list</a>.</p>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]1106
1107<ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1108 <li>The Alpha, Blackfin, CellSPU, MicroBlaze, MSP430, MIPS, PTX, SystemZ and
1109 XCore backends are experimental.</li>
1110
1111 <li><tt>llc</tt> "<tt>-filetype=obj</tt>" is experimental on all targets other
1112 than darwin and ELF X86 systems.</li>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]1113</ul>
1114
1115</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1116
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1117<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1118<h3>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1119 <a name="x86-be">Known problems with the X86 back-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1120</h3>
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]1121
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1122<div>
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]1123
1124<ul>
Anton Korobeynikova6094be2008-06-08 10:24:13 +0000[diff] [blame]1125 <li>The X86 backend does not yet support
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1126 all <a href="http://llvm.org/PR879">inline assembly that uses the X86
1127 floating point stack</a>. It supports the 'f' and 't' constraints, but
1128 not 'u'.</li>
1129
Dan Gohman8207ba92008-06-08 23:05:11 +0000[diff] [blame]1130 <li>The X86-64 backend does not yet support the LLVM IR instruction
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1131 <tt>va_arg</tt>. Currently, front-ends support variadic argument
1132 constructs on X86-64 by lowering them manually.</li>
1133
NAKAMURA Takumi45c435a2011-04-05 08:24:22 +0000[diff] [blame]1134 <li>Windows x64 (aka Win64) code generator has a few issues.
1135 <ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1136 <li>llvm-gcc cannot build the mingw-w64 runtime currently due to lack of
1137 support for the 'u' inline assembly constraint and for X87 floating
1138 point inline assembly.</li>
1139
1140 <li>On mingw-w64, you will see unresolved symbol <tt>__chkstk</tt> due
1141 to <a href="http://llvm.org/bugs/show_bug.cgi?id=8919">Bug 8919</a>.
1142 It is fixed
1143 in <a href="http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20110321/118499.html">r128206</a>.</li>
1144
NAKAMURA Takumi45c435a2011-04-05 08:24:22 +0000[diff] [blame]1145 <li>Miss-aligned MOVDQA might crash your program. It is due to
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1146 <a href="http://llvm.org/bugs/show_bug.cgi?id=9483">Bug 9483</a>, lack
1147 of handling aligned internal globals.</li>
NAKAMURA Takumi45c435a2011-04-05 08:24:22 +0000[diff] [blame]1148 </ul>
1149 </li>
1150
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1151</ul>
1152
1153</div>
1154
1155<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1156<h3>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1157 <a name="ppc-be">Known problems with the PowerPC back-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1158</h3>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1159
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1160<div>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1161
1162<ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1163 <li>The Linux PPC32/ABI support needs testing for the interpreter and static
1164 compilation, and lacks support for debug information.</li>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1165</ul>
1166
1167</div>
1168
1169<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1170<h3>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]1171 <a name="arm-be">Known problems with the ARM back-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1172</h3>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]1173
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1174<div>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]1175
1176<ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1177 <li>Thumb mode works only on ARMv6 or higher processors. On sub-ARMv6
1178 processors, thumb programs can crash or produce wrong results
1179 (<a href="http://llvm.org/PR1388">PR1388</a>).</li>
1180
1181 <li>Compilation for ARM Linux OABI (old ABI) is supported but not fully
1182 tested.</li>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]1183</ul>
1184
1185</div>
1186
1187<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1188<h3>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1189 <a name="sparc-be">Known problems with the SPARC back-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1190</h3>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1191
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1192<div>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1193
1194<ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1195 <li>The SPARC backend only supports the 32-bit SPARC ABI (-m32); it does not
1196 support the 64-bit SPARC ABI (-m64).</li>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1197</ul>
1198
1199</div>
1200
1201<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1202<h3>
Bruno Cardoso Lopesb7e1a4f2008-10-25 14:56:26 +0000[diff] [blame]1203 <a name="mips-be">Known problems with the MIPS back-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1204</h3>
Bruno Cardoso Lopesb7e1a4f2008-10-25 14:56:26 +0000[diff] [blame]1205
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1206<div>
Bruno Cardoso Lopesb7e1a4f2008-10-25 14:56:26 +0000[diff] [blame]1207
1208<ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1209 <li>64-bit MIPS targets are not supported yet.</li>
Bruno Cardoso Lopesb7e1a4f2008-10-25 14:56:26 +0000[diff] [blame]1210</ul>
1211
1212</div>
1213
1214<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1215<h3>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1216 <a name="alpha-be">Known problems with the Alpha back-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1217</h3>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1218
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1219<div>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1220
1221<ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1222 <li>On 21164s, some rare FP arithmetic sequences which may trap do not have
1223 the appropriate nops inserted to ensure restartability.</li>
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]1224</ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1225
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]1226</div>
1227
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1228<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1229<h3>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]1230 <a name="c-be">Known problems with the C back-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1231</h3>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1232
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1233<div>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1234
Chris Lattner3016ee92010-09-29 05:34:42 +0000[diff] [blame]1235<p>The C backend has numerous problems and is not being actively maintained.
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1236 Depending on it for anything serious is not advised.</p>
Chris Lattner3016ee92010-09-29 05:34:42 +0000[diff] [blame]1237
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1238<ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1239 <li><a href="http://llvm.org/PR802">The C backend has only basic support for
1240 inline assembly code</a>.</li>
1241
1242 <li><a href="http://llvm.org/PR1658">The C backend violates the ABI of common
1243 C++ programs</a>, preventing intermixing between C++ compiled by the CBE
1244 and C++ code compiled with <tt>llc</tt> or native compilers.</li>
1245
1246 <li>The C backend does not support all exception handling constructs.</li>
1247
1248 <li>The C backend does not support arbitrary precision integers.</li>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1249</ul>
1250
1251</div>
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]1252
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1253
1254<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1255<h3>
Chris Lattner3016ee92010-09-29 05:34:42 +0000[diff] [blame]1256 <a name="llvm-gcc">Known problems with the llvm-gcc front-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1257</h3>
Chris Lattner47588f92003-10-02 05:07:23 +0000[diff] [blame]1258
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1259<div>
Chris Lattnerc5d658a2006-03-03 00:34:26 +0000[diff] [blame]1260
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1261<p><b>LLVM 2.9 was the last release of llvm-gcc.</b></p>
Chris Lattner49123fd2011-04-06 06:29:50 +0000[diff] [blame]1262
Chris Lattner3016ee92010-09-29 05:34:42 +0000[diff] [blame]1263<p>llvm-gcc is generally very stable for the C family of languages. The only
1264 major language feature of GCC not supported by llvm-gcc is the
1265 <tt>__builtin_apply</tt> family of builtins. However, some extensions
1266 are only supported on some targets. For example, trampolines are only
1267 supported on some targets (these are used when you take the address of a
1268 nested function).</p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1269
Chris Lattner3016ee92010-09-29 05:34:42 +0000[diff] [blame]1270<p>Fortran support generally works, but there are still several unresolved bugs
1271 in <a href="http://llvm.org/bugs/">Bugzilla</a>. Please see the
1272 tools/gfortran component for details. Note that llvm-gcc is missing major
1273 Fortran performance work in the frontend and library that went into GCC after
1274 4.2. If you are interested in Fortran, we recommend that you consider using
1275 <a href="#dragonegg">dragonegg</a> instead.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1276
Duncan Sands3af96332010-10-04 10:06:56 +0000[diff] [blame]1277<p>The llvm-gcc 4.2 Ada compiler has basic functionality, but is no longer being
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1278 actively maintained. If you are interested in Ada, we recommend that you
1279 consider using <a href="#dragonegg">dragonegg</a> instead.</p>
1280
Chris Lattner2b659ef2008-02-12 06:29:45 +0000[diff] [blame]1281</div>
1282
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1283</div>
1284
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1285<!-- *********************************************************************** -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1286<h2>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1287 <a name="additionalinfo">Additional Information</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1288</h2>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1289<!-- *********************************************************************** -->
1290
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1291<div>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1292
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1293<p>A wide variety of additional information is available on
1294 the <a href="http://llvm.org/">LLVM web page</a>, in particular in
1295 the <a href="http://llvm.org/docs/">documentation</a> section. The web page
1296 also contains versions of the API documentation which is up-to-date with the
1297 Subversion version of the source code. You can access versions of these
1298 documents specific to this release by going into the "<tt>llvm/doc/</tt>"
1299 directory in the LLVM tree.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1300
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1301<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]1302 us via the <a href="http://llvm.org/docs/#maillist"> mailing lists</a>.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1303
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