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Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]7 <title>LLVM 3.1 Release Notes</title>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]8</head>
9<body>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]10
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]11<h1>LLVM 3.1 Release Notes</h1>
Mikhail Glushenkovea65d7d2008-10-13 02:08:34 +0000[diff] [blame]12
Jakub Staszakf8de54f2011-12-06 23:33:07 +0000[diff] [blame]13<div>
14<img style="float:right" src="http://llvm.org/img/DragonSmall.png"
15 width="136" height="136" alt="LLVM Dragon Logo">
16</div>
Chris Lattner0e464a92010-03-17 04:02:39 +0000[diff] [blame]17
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]18<ol>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]19 <li><a href="#intro">Introduction</a></li>
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]20 <li><a href="#subproj">Sub-project Status Update</a></li>
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]21 <li><a href="#externalproj">External Projects Using LLVM 3.1</a></li>
22 <li><a href="#whatsnew">What's New in LLVM?</a></li>
Chris Lattner4b538b92004-04-30 22:17:12 +0000[diff] [blame]23 <li><a href="GettingStarted.html">Installation Instructions</a></li>
Dan Gohman44aa9212008-10-14 16:23:02 +0000[diff] [blame]24 <li><a href="#knownproblems">Known Problems</a></li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]25 <li><a href="#additionalinfo">Additional Information</a></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]26</ol>
27
Chris Lattner7911ce22004-05-23 21:07:27 +0000[diff] [blame]28<div class="doc_author">
NAKAMURA Takumib9a33632011-04-09 02:13:37 +0000[diff] [blame]29 <p>Written by the <a href="http://llvm.org/">LLVM Team</a></p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]30</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]31
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]32<h1 style="color:red">These are in-progress notes for the upcoming LLVM 3.1
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]33release.<br>
34You may prefer the
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]35<a href="http://llvm.org/releases/3.0/docs/ReleaseNotes.html">LLVM 3.0
Dan Gohmanb44f6c62010-05-03 23:51:05 +0000[diff] [blame]36Release Notes</a>.</h1>
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]37
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]38<!-- *********************************************************************** -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]39<h2>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]40 <a name="intro">Introduction</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]41</h2>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]42<!-- *********************************************************************** -->
43
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]44<div>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]45
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]46<p>This document contains the release notes for the LLVM Compiler
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]47 Infrastructure, release 3.1. Here we describe the status of LLVM, including
Chris Lattner1ab8ce92011-11-27 18:47:37 +0000[diff] [blame]48 major improvements from the previous release, improvements in various
49 subprojects of LLVM, and some of the current users of the code.
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]50 All LLVM releases may be downloaded from
51 the <a href="http://llvm.org/releases/">LLVM releases web site</a>.</p>
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]52
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame]53<p>For more information about LLVM, including information about the latest
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]54 release, please check out the <a href="http://llvm.org/">main LLVM web
55 site</a>. If you have questions or comments,
56 the <a href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVM
57 Developer's Mailing List</a> is a good place to send them.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]58
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]59<p>Note that if you are reading this file from a Subversion checkout or the main
60 LLVM web page, this document applies to the <i>next</i> release, not the
61 current one. To see the release notes for a specific release, please see the
62 <a href="http://llvm.org/releases/">releases page</a>.</p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]63
64</div>
Michael J. Spencer60f790c2011-11-28 18:20:09 +0000[diff] [blame]65
66
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]67<!-- *********************************************************************** -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]68<h2>
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]69 <a name="subproj">Sub-project Status Update</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]70</h2>
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]71<!-- *********************************************************************** -->
Chris Lattnerea34f642008-06-08 21:34:41 +0000[diff] [blame]72
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]73<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]74
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]75<p>The LLVM 3.1 distribution currently consists of code from the core LLVM
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]76 repository (which roughly includes the LLVM optimizers, code generators and
Chris Lattnerc343e312011-11-10 20:15:40 +0000[diff] [blame]77 supporting tools), and the Clang repository. In
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]78 addition to this code, the LLVM Project includes other sub-projects that are
79 in development. Here we include updates on these subprojects.</p>
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]80
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]81<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]82<h3>
Chris Lattnerfb97b2d2008-10-13 18:11:54 +0000[diff] [blame]83<a name="clang">Clang: C/C++/Objective-C Frontend Toolkit</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]84</h3>
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]85
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]86<div>
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]87
Chris Lattner095539f2010-04-26 17:42:18 +0000[diff] [blame]88<p><a href="http://clang.llvm.org/">Clang</a> is an LLVM front end for the C,
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]89 C++, and Objective-C languages. Clang aims to provide a better user
90 experience through expressive diagnostics, a high level of conformance to
91 language standards, fast compilation, and low memory use. Like LLVM, Clang
92 provides a modular, library-based architecture that makes it suitable for
93 creating or integrating with other development tools. Clang is considered a
94 production-quality compiler for C, Objective-C, C++ and Objective-C++ on x86
Chris Lattner1ab8ce92011-11-27 18:47:37 +0000[diff] [blame]95 (32- and 64-bit), and for Darwin/ARM targets.</p>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]96
Benjamin Kramer88c8e692012-05-13 10:40:08 +0000[diff] [blame]97<p>In the LLVM 3.1 time-frame, the Clang team has made many improvements.
98 Highlights include:</p>
Douglas Gregorba087df2011-10-15 00:48:01 +0000[diff] [blame]99<ul>
Benjamin Kramer88c8e692012-05-13 10:40:08 +0000[diff] [blame]100 <li>Greatly expanded <a href="http://clang.llvm.org/cxx_status.html">C++11
101 support</a> including lambdas, initializer lists, constexpr, user-defined
102 literals, and atomics.</li>
103 <li>A new <a href="http://clang.llvm.org/docs/Tooling.html">tooling</a>
104 library to ease building of clang-based standalone tools.</li>
105 <li>Extended support for
106 <a href="http://clang.llvm.org/docs/ObjectiveCLiterals.html">literals in
107 Objective C</a>.</li>
Douglas Gregorba087df2011-10-15 00:48:01 +0000[diff] [blame]108</ul>
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]109
Benjamin Kramer88c8e692012-05-13 10:40:08 +0000[diff] [blame]110 <p>For more details about the changes to Clang since the 3.0 release, see the
Chandler Carruthcc966de2011-11-29 00:32:43 +0000[diff] [blame]111<a href="http://clang.llvm.org/docs/ReleaseNotes.html">Clang release notes</a>
112</p>
Douglas Gregorba087df2011-10-15 00:48:01 +0000[diff] [blame]113
Michael J. Spencer60f790c2011-11-28 18:20:09 +0000[diff] [blame]114
Duncan Sandsf3ba7af2011-04-06 08:07:40 +0000[diff] [blame]115<p>If Clang rejects your code but another compiler accepts it, please take a
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]116 look at the <a href="http://clang.llvm.org/compatibility.html">language
117 compatibility</a> guide to make sure this is not intentional or a known
118 issue.</p>
Bill Wendling741748a2008-10-27 09:27:33 +0000[diff] [blame]119
Chris Lattnerfb97b2d2008-10-13 18:11:54 +0000[diff] [blame]120</div>
121
122<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]123<h3>
Duncan Sands528a5102011-04-04 11:09:08 +0000[diff] [blame]124<a name="dragonegg">DragonEgg: GCC front-ends, LLVM back-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]125</h3>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]126
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]127<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]128<p><a href="http://dragonegg.llvm.org/">DragonEgg</a> is a
129 <a href="http://gcc.gnu.org/wiki/plugins">gcc plugin</a> that replaces GCC's
Duncan Sands5abd10a2012-05-11 19:59:43 +0000[diff] [blame]130 optimizers and code generators with LLVM's. It works with gcc-4.5 and gcc-4.6
131 (and partially with gcc-4.7), can target the x86-32/x86-64 and ARM processor
132 families, and has been successfully used on the Darwin, FreeBSD, KFreeBSD,
133 Linux and OpenBSD platforms. It fully supports Ada, C, C++ and Fortran. It
134 has partial support for Go, Java, Obj-C and Obj-C++.</p>
Duncan Sands749fd832010-04-02 09:23:15 +0000[diff] [blame]135
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]136<p>The 3.1 release has the following notable changes:</p>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]137
Chris Lattner1ab8ce92011-11-27 18:47:37 +0000[diff] [blame]138 <ul>
Duncan Sands77352c92011-11-10 18:44:29 +0000[diff] [blame]139
Duncan Sands5abd10a2012-05-11 19:59:43 +0000[diff] [blame]140 <li>Partial support for gcc-4.7. Ada support is poor, but other languages work
141 fairly well.</li>
142
143 <li>Support for ARM processors. Some essential gcc headers that are needed to
144 build DragonEgg for ARM are not installed by gcc. To work around this,
145 copy the missing headers from the gcc source tree.</li>
146
147 <li>Better optimization for Fortran by exploiting the fact that Fortran scalar
148 arguments have 'restrict' semantics.</li>
149
150 <li>Better optimization for all languages by passing information about type
151 aliasing and type ranges to the LLVM optimizers.</li>
152
153 <li>A regression test-suite was added.</li>
Duncan Sands77352c92011-11-10 18:44:29 +0000[diff] [blame]154
Duncan Sands4b1da2b2010-09-30 17:37:34 +0000[diff] [blame]155</ul>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]156
157</div>
158
Chris Lattner75547712010-10-03 23:49:06 +0000[diff] [blame]159<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]160<h3>
Chris Lattner75547712010-10-03 23:49:06 +0000[diff] [blame]161<a name="compiler-rt">compiler-rt: Compiler Runtime Library</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]162</h3>
Chris Lattner75547712010-10-03 23:49:06 +0000[diff] [blame]163
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]164<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]165
166<p>The new LLVM <a href="http://compiler-rt.llvm.org/">compiler-rt project</a>
167 is a simple library that provides an implementation of the low-level
168 target-specific hooks required by code generation and other runtime
169 components. For example, when compiling for a 32-bit target, converting a
170 double to a 64-bit unsigned integer is compiled into a runtime call to the
171 "__fixunsdfdi" function. The compiler-rt library provides highly optimized
172 implementations of this and other low-level routines (some are 3x faster than
173 the equivalent libgcc routines).</p>
Chris Lattner75547712010-10-03 23:49:06 +0000[diff] [blame]174
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]175<p>....</p>
Chris Lattner75547712010-10-03 23:49:06 +0000[diff] [blame]176
177</div>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]178
179<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]180<h3>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]181<a name="lldb">LLDB: Low Level Debugger</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]182</h3>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]183
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]184<div>
Michael J. Spencer60f790c2011-11-28 18:20:09 +0000[diff] [blame]185
Benjamin Kramerabe446c2012-05-13 10:21:51 +0000[diff] [blame]186<p><a href="http://lldb.llvm.org">LLDB</a> is a ground-up implementation of a
187 command line debugger, as well as a debugger API that can be used from other
188 applications. LLDB makes use of the Clang parser to provide high-fidelity
189 expression parsing (particularly for C++) and uses the LLVM JIT for target
190 support.</p>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]191
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]192<p>...</p>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]193
194</div>
195
196<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]197<h3>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]198<a name="libc++">libc++: C++ Standard Library</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]199</h3>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]200
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]201<div>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]202
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]203<p>Like compiler_rt, libc++ is now <a href="DeveloperPolicy.html#license">dual
204 licensed</a> under the MIT and UIUC license, allowing it to be used more
205 permissively.</p>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]206
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]207<p>...</p>
David Chisnall553284e2011-11-26 10:56:17 +0000[diff] [blame]208
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]209</div>
210
Chris Lattner3d6a80a2011-04-07 03:08:22 +0000[diff] [blame]211<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]212<h3>
Chris Lattner3d6a80a2011-04-07 03:08:22 +0000[diff] [blame]213<a name="vmkit">VMKit</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]214</h3>
Chris Lattner3d6a80a2011-04-07 03:08:22 +0000[diff] [blame]215
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]216<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]217
Nicolas Geoffray54d5df92011-11-10 23:37:56 +0000[diff] [blame]218 <p>The <a href="http://vmkit.llvm.org/">VMKit project</a> is an
219 implementation of a Java Virtual Machine (Java VM or JVM) that uses LLVM for
220 static and just-in-time compilation.
221
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]222 <p>In the LLVM 3.1 time-frame, VMKit has had significant improvements on both
Nicolas Geoffray54d5df92011-11-10 23:37:56 +0000[diff] [blame]223 runtime and startup performance:</p>
224
225 <ul>
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]226 <li>...</li>
Nicolas Geoffray54d5df92011-11-10 23:37:56 +0000[diff] [blame]227 </ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]228
Chris Lattner3d6a80a2011-04-07 03:08:22 +0000[diff] [blame]229</div>
Michael J. Spencer60f790c2011-11-28 18:20:09 +0000[diff] [blame]230
Tobias Grosser76213b82012-04-16 17:17:00 +0000[diff] [blame]231
232<!--=========================================================================-->
233<h3>
Tobias Grosser99a0b282012-04-16 17:18:49 +0000[diff] [blame]234<a name="Polly">Polly: Polyhedral Optimizer</a>
Tobias Grosser76213b82012-04-16 17:17:00 +0000[diff] [blame]235</h3>
236
237<div>
238
239 <p><a href="http://polly.llvm.org/">Polly</a> is an <em>experimental</em>
240 optimizer for data locality and parallelism. It currently provides high-level
241 loop optimizations and automatic parallelisation (using the OpenMP run time).
242 Work in the area of automatic SIMD and accelerator code generation was
243 started.
244
245 <p>Within the LLVM 3.1 time-frame there were the following highlights:</p>
246
247 <ul>
248 <li>Polly became an official LLVM project</li>
249 <li>Polly can be loaded directly into clang (Enabled by '-O3 -mllvm -polly'
250 )</li>
251 <li>An automatic scheduling optimizer (derived from <a
252 href="http://pluto-compiler.sourceforge.net/">Pluto</a>) was integrated. It
253 performs loop transformations to optimize for data-locality and parallelism.
254 The transformations include, but are not limited to interchange, fusion,
255 fission, skewing and tiling.
256 </li>
257 </ul>
258
259</div>
260
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]261</div>
Daniel Dunbar97b01a82010-10-04 17:39:47 +0000[diff] [blame]262
Chris Lattnerab68e9e2009-02-26 22:33:38 +0000[diff] [blame]263<!-- *********************************************************************** -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]264<h2>
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]265 <a name="externalproj">External Open Source Projects Using LLVM 3.1</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]266</h2>
Chris Lattnerab68e9e2009-02-26 22:33:38 +0000[diff] [blame]267<!-- *********************************************************************** -->
268
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]269<div>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]270
271<p>An exciting aspect of LLVM is that it is used as an enabling technology for
272 a lot of other language and tools projects. This section lists some of the
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]273 projects that have already been updated to work with LLVM 3.1.</p>
Chris Lattner75547712010-10-03 23:49:06 +0000[diff] [blame]274
Bill Wendlingf8cfe2e2012-05-13 09:52:48 +0000[diff] [blame]275<h3>FAUST</h3>
276
277<div>
278
Benjamin Kramerabe446c2012-05-13 10:21:51 +0000[diff] [blame]279<p><a href="http://faust.grame.fr/">FAUST</a> is a compiled language for
280 real-time audio signal processing. The name FAUST stands for Functional
281 AUdio STream. Its programming model combines two approaches: functional
282 programming and block diagram composition. In addition with the C, C++, Java,
283 JavaScript output formats, the Faust compiler can generate LLVM bitcode, and
284 works with LLVM 2.7-3.1.</p>
Bill Wendlingf8cfe2e2012-05-13 09:52:48 +0000[diff] [blame]285
286</div>
287
Bill Wendlingde86bea2012-05-11 21:42:37 +0000[diff] [blame]288<h3>Glasgow Haskell Compiler (GHC)</h3>
289
290<div>
291
Benjamin Kramerabe446c2012-05-13 10:21:51 +0000[diff] [blame]292<p><a href="http://www.haskell.org/ghc/">GHC</a> is an open source compiler and
293 programming suite for Haskell, a lazy functional programming language. It
294 includes an optimizing static compiler generating good code for a variety of
295 platforms, together with an interactive system for convenient, quick
296 development.</p>
Bill Wendlingde86bea2012-05-11 21:42:37 +0000[diff] [blame]297
298<p>GHC 7.0 and onwards include an LLVM code generator, supporting LLVM 2.8 and
299 later.</p>
300
301</div>
302
Bill Wendlinge9a73bb2012-05-14 06:23:51 +0000[diff] [blame^]303<h3>Julia</h3>
304
305<div>
306
307<p><a href="https://github.com/JuliaLang/julia">Julia</a> is a high-level,
308 high-performance dynamic language for technical computing. It provides a
309 sophisticated compiler, distributed parallel execution, numerical accuracy,
310 and an extensive mathematical function library. The compiler uses type
311 inference to generate fast code without any type declarations, and uses
312 LLVM's optimization passes and JIT compiler. The
313 <a href="http://julialang.org/"> Julia Language</a> is designed
314 around multiple dispatch, giving programs a large degree of flexibility. It
315 is ready for use on many kinds of problems.</p>
316
317</div>
318
Bill Wendlingf2f92ba2012-05-13 10:00:58 +0000[diff] [blame]319<h3>LLVM D Compiler</h3>
320
321<div>
322
323<p><a href="https://github.com/ldc-developers/ldc">LLVM D Compiler</a> (LDC) is
324 a compiler for the D programming Language. It is based on the DMD frontend
325 and uses LLVM as backend.</p>
326
327</div>
328
Bill Wendling91071052012-05-13 09:55:24 +0000[diff] [blame]329<h3>Open Shading Language</h3>
330
331<div>
332
Benjamin Kramerabe446c2012-05-13 10:21:51 +0000[diff] [blame]333<p><a href="https://github.com/imageworks/OpenShadingLanguage/">Open Shading
334 Language (OSL)</a> is a small but rich language for programmable shading in
335 advanced global illumination renderers and other applications, ideal for
336 describing materials, lights, displacement, and pattern generation. It uses
337 LLVM to JIT complex shader networks to x86 code at runtime.</p>
Bill Wendling91071052012-05-13 09:55:24 +0000[diff] [blame]338
339<p>OSL was developed by Sony Pictures Imageworks for use in its in-house
340 renderer used for feature film animation and visual effects, and is
Benjamin Kramerabe446c2012-05-13 10:21:51 +0000[diff] [blame]341 distributed as open source software with the "New BSD" license.</p>
Bill Wendling91071052012-05-13 09:55:24 +0000[diff] [blame]342
343</div>
344
Bill Wendling59a23e32012-05-13 09:59:27 +0000[diff] [blame]345<h3>Portable OpenCL (pocl)</h3>
346
347<div>
348
349<p>In addition to producing an easily portable open source OpenCL
Benjamin Kramerabe446c2012-05-13 10:21:51 +0000[diff] [blame]350 implementation, another major goal of <a href="http://pocl.sourceforge.net/">
351 pocl</a> is improving performance portability of OpenCL programs with
352 compiler optimizations, reducing the need for target-dependent manual
353 optimizations. An important part of pocl is a set of LLVM passes used to
354 statically parallelize multiple work-items with the kernel compiler, even in
355 the presence of work-group barriers. This enables static parallelization of
356 the fine-grained static concurrency in the work groups in multiple ways
357 (SIMD, VLIW, superscalar,...).</p>
Bill Wendling59a23e32012-05-13 09:59:27 +0000[diff] [blame]358
359</div>
360
Bill Wendlingde86bea2012-05-11 21:42:37 +0000[diff] [blame]361<h3>Pure</h3>
362
363<div>
364
Bill Wendling015d2ad2012-05-11 22:38:33 +0000[diff] [blame]365<p><a href="http://pure-lang.googlecode.com/">Pure</a> is an
366 algebraic/functional programming language based on term rewriting. Programs
367 are collections of equations which are used to evaluate expressions in a
368 symbolic fashion. The interpreter uses LLVM as a backend to JIT-compile Pure
369 programs to fast native code. Pure offers dynamic typing, eager and lazy
370 evaluation, lexical closures, a hygienic macro system (also based on term
371 rewriting), built-in list and matrix support (including list and matrix
372 comprehensions) and an easy-to-use interface to C and other programming
373 languages (including the ability to load LLVM bitcode modules, and inline C,
374 C++, Fortran and Faust code in Pure programs if the corresponding
375 LLVM-enabled compilers are installed).</p>
Bill Wendlingde86bea2012-05-11 21:42:37 +0000[diff] [blame]376
377<p>Pure version 0.54 has been tested and is known to work with LLVM 3.1 (and
378 continues to work with older LLVM releases >= 2.5).</p>
379
380</div>
Bill Wendling644ce532011-10-26 09:25:01 +0000[diff] [blame]381
Bill Wendling59a23e32012-05-13 09:59:27 +0000[diff] [blame]382<h3>TTA-based Co-design Environment (TCE)</h3>
383
384<div>
385
Benjamin Kramerabe446c2012-05-13 10:21:51 +0000[diff] [blame]386<p><a href="http://tce.cs.tut.fi/">TCE</a> is a toolset for designing
387 application-specific processors (ASP) based on the Transport triggered
388 architecture (TTA). The toolset provides a complete co-design flow from C/C++
389 programs down to synthesizable VHDL/Verilog and parallel program binaries.
390 Processor customization points include the register files, function units,
391 supported operations, and the interconnection network.</p>
Bill Wendling59a23e32012-05-13 09:59:27 +0000[diff] [blame]392
393<p>TCE uses Clang and LLVM for C/C++ language support, target independent
394 optimizations and also for parts of code generation. It generates new
395 LLVM-based code generators "on the fly" for the designed TTA processors and
396 loads them in to the compiler backend as runtime libraries to avoid
397 per-target recompilation of larger parts of the compiler chain.</p>
398
399</div>
400
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]401</div>
402
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]403<!-- *********************************************************************** -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]404<h2>
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]405 <a name="whatsnew">What's New in LLVM 3.1?</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]406</h2>
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]407<!-- *********************************************************************** -->
408
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]409<div>
Chris Lattnerf8e0b4e2008-06-08 22:59:35 +0000[diff] [blame]410
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]411<p>This release includes a huge number of bug fixes, performance tweaks and
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]412 minor improvements. Some of the major improvements and new features are
413 listed in this section.</p>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]414
Chris Lattner914ce462010-04-22 06:28:20 +0000[diff] [blame]415<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]416<h3>
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]417<a name="majorfeatures">Major New Features</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]418</h3>
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]419
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]420<div>
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]421
Chris Lattner1ab8ce92011-11-27 18:47:37 +0000[diff] [blame]422 <!-- Features that need text if they're finished for 3.1:
423 ARM EHABI
424 combiner-aa?
425 strong phi elim
426 loop dependence analysis
427 CorrelatedValuePropagation
428 lib/Transforms/IPO/MergeFunctions.cpp => consider for 3.1.
Chris Lattner1c80fbf2011-11-27 20:51:47 +0000[diff] [blame]429 Integrated assembler on by default for arm/thumb?
430
Chris Lattner1ab8ce92011-11-27 18:47:37 +0000[diff] [blame]431 -->
432
Chris Lattner1c80fbf2011-11-27 20:51:47 +0000[diff] [blame]433 <!-- Near dead:
Chris Lattnerdec23b62011-11-15 22:13:27 +0000[diff] [blame]434 Analysis/RegionInfo.h + Dom Frontiers
435 SparseBitVector: used in LiveVar.
Chris Lattner5a1731d2011-11-27 08:32:32 +0000[diff] [blame]436 llvm/lib/Archive - replace with lib object?
Chris Lattner1c80fbf2011-11-27 20:51:47 +0000[diff] [blame]437 -->
Chris Lattner6a007d12011-11-25 20:33:27 +0000[diff] [blame]438
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]439<p>LLVM 3.1 includes several major changes and big features:</p>
Bill Wendlingbc5f6dd2011-10-26 18:33:01 +0000[diff] [blame]440
Chris Lattner791f77b2008-06-05 06:25:56 +0000[diff] [blame]441<ul>
Evan Cheng28681862011-12-14 22:57:45 +0000[diff] [blame]442 <li><a href="../tools/clang/docs/AddressSanitizer.html">AddressSanitizer</a>,
443 a fast memory error detector.</li>
444 <li><a href="CodeGenerator.html#machineinstrbundle">MachineInstr Bundles</a>,
445 Support to model instruction bundling / packing.</li>
Jim Grosbach6e6b8222012-02-23 23:52:06 +0000[diff] [blame]446 <li><a href="#armintegratedassembler">ARM Integrated Assembler</a>,
447 A full featured assembler and direct-to-object support for ARM.</li>
Chandler Carruth268fde42012-04-17 01:10:35 +0000[diff] [blame]448 <li><a href="#blockplacement">Basic Block Placement</a>
449 Probability driven basic block placement.</li>
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]450 <li>....</li>
Chris Lattnerf304ffc2008-02-10 08:17:19 +0000[diff] [blame]451</ul>
Mikhail Glushenkovea65d7d2008-10-13 02:08:34 +0000[diff] [blame]452
Bill Wendlingbc5f6dd2011-10-26 18:33:01 +0000[diff] [blame]453</div>
454
Michael J. Spencer60f790c2011-11-28 18:20:09 +0000[diff] [blame]455
Chris Lattner4f0fe432011-11-27 19:26:30 +0000[diff] [blame]456<!--=========================================================================-->
457<h3>
458<a name="coreimprovements">LLVM IR and Core Improvements</a>
459</h3>
460
461<div>
462
463<p>LLVM IR has several new features for better support of new targets and that
464 expose new optimization opportunities:</p>
465
Chris Lattner064caf92011-11-27 21:30:28 +0000[diff] [blame]466 <ul>
Benjamin Kramerf26b4152012-05-13 12:01:16 +0000[diff] [blame]467 <li>A new type representing 16 bit <i>half</i> floating point values has
468 been added.</li>
469 <li>IR now supports vectors of pointers, including vector GEPs.</li>
Bill Wendling190ec9b2012-02-16 10:23:43 +0000[diff] [blame]470 <li>Module flags have been introduced. They convey information about the
Benjamin Kramerf26b4152012-05-13 12:01:16 +0000[diff] [blame]471 module as a whole to LLVM subsystems. This is currently used to encode
472 Objective C ABI information.</li>
Rafael Espindola626c3462012-03-25 11:14:35 +0000[diff] [blame]473 <li>Loads can now have range metadata attached to them to describe the
Rafael Espindola692cd452012-03-24 19:02:32 +0000[diff] [blame]474 possible values being loaded.</li>
Benjamin Kramer3a2d5652012-05-13 13:10:35 +0000[diff] [blame]475 <li>The <tt>llvm.ctlz</tt> and <tt>llvm.cttz</tt> intrinsics now have an
476 additional argument which indicates whether the behavior of the intrinsic
477 is undefined on a zero input. This can be used to generate more efficient
478 code on platforms that only have instructions which don't return the type
479 size when counting bits in 0.</li>
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]480 <li>....</li>
Chris Lattner064caf92011-11-27 21:30:28 +0000[diff] [blame]481 </ul>
Andrew Trick5aab6382011-11-06 17:59:24 +0000[diff] [blame]482</div>
483
484<!--=========================================================================-->
485<h3>
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]486<a name="optimizer">Optimizer Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]487</h3>
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]488
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]489<div>
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]490
Chris Lattner064caf92011-11-27 21:30:28 +0000[diff] [blame]491<p>In addition to many minor performance tweaks and bug fixes, this
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]492 release includes a few major enhancements and additions to the
493 optimizers:</p>
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]494
495<ul>
Brendon Cahoonff730392012-04-14 16:54:12 +0000[diff] [blame]496 <li>The loop unroll pass now is able to unroll loops with run-time trip counts.
497 This feature is turned off by default, and is enabled with the
498 <code>-unroll-runtime</code> flag.</li>
Hal Finkel9068bf52012-04-16 03:49:43 +0000[diff] [blame]499 <li>A new basic-block autovectorization pass is available. Pass
500 <code>-vectorize</code> to run this pass along with some associated
Hal Finkel12c10b32012-04-16 17:06:49 +0000[diff] [blame]501 post-vectorization cleanup passes. For more information, see the EuroLLVM
502 2012 slides: <a href="http://llvm.org/devmtg/2012-04-12/Slides/Hal_Finkel.pdf">
503 Autovectorization with LLVM</a>.</li>
Benjamin Kramerf26b4152012-05-13 12:01:16 +0000[diff] [blame]504 <li>Inline cost heuristics have been completely overhauled and now closely
505 model constant propagation through call sites, disregard trivially dead
506 code costs, and can model C++ STL iterator patterns.</li>
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]507 <li>....</li>
Chris Lattner11b66112010-10-04 02:42:39 +0000[diff] [blame]508</ul>
509
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]510</div>
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]511
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]512<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]513<h3>
Chris Lattner4ba2b652010-09-30 16:31:33 +0000[diff] [blame]514<a name="mc">MC Level Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]515</h3>
Chris Lattner4ba2b652010-09-30 16:31:33 +0000[diff] [blame]516
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]517<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]518
519<p>The LLVM Machine Code (aka MC) subsystem was created to solve a number of
520 problems in the realm of assembly, disassembly, object file format handling,
521 and a number of other related areas that CPU instruction-set level tools work
Chris Lattner2f206022011-11-27 22:03:34 +0000[diff] [blame]522 in. For more information, please see
523 the <a href="http://blog.llvm.org/2010/04/intro-to-llvm-mc-project.html">Intro
524 to the LLVM MC Project Blog Post</a>.</p>
Chris Lattner7d9b6b42010-10-02 21:59:30 +0000[diff] [blame]525
Chris Lattner7d9b6b42010-10-02 21:59:30 +0000[diff] [blame]526<ul>
Benjamin Kramerf26b4152012-05-13 12:01:16 +0000[diff] [blame]527 <li>The integrated assembler can optionally emit debug information when
528 assembling a </tt>.s</tt> file. It can be enabled by passing the
529 <tt>-g</tt> option to <tt>llvm-mc</tt>.</li>
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]530 <li>....</li>
Chris Lattner7d9b6b42010-10-02 21:59:30 +0000[diff] [blame]531</ul>
532
NAKAMURA Takumi45c435a2011-04-05 08:24:22 +0000[diff] [blame]533</div>
Chris Lattner4ba2b652010-09-30 16:31:33 +0000[diff] [blame]534
Chris Lattner4ba2b652010-09-30 16:31:33 +0000[diff] [blame]535<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]536<h3>
Chris Lattner511433e2009-03-02 03:24:11 +0000[diff] [blame]537<a name="codegen">Target Independent Code Generator Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]538</h3>
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]539
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]540<div>
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]541
Bill Wendling190ec9b2012-02-16 10:23:43 +0000[diff] [blame]542<p>We have changed the way that the Type Legalizer legalizes vectors. The type
543 legalizer now attempts to promote integer elements. This enabled the
544 implementation of vector-select. Additionally, we see a performance boost on
545 workloads which use vectors of chars and shorts, since they are now promoted
546 to 32-bit types, which are better supported by the SIMD instruction set.
547 Floating point types are still widened as before.</p>
Nadav Rotem75597662011-12-20 08:02:50 +0000[diff] [blame]548
549
Mikhail Glushenkovf795ef02009-03-01 18:09:47 +0000[diff] [blame]550<p>We have put a significant amount of work into the code generator
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]551 infrastructure, which allows us to implement more aggressive algorithms and
552 make it run faster:</p>
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]553
554<ul>
Jakob Stoklund Olesen9897c622011-12-19 16:53:40 +0000[diff] [blame]555 <li>TableGen can now synthesize register classes that are only needed to
Bill Wendling190ec9b2012-02-16 10:23:43 +0000[diff] [blame]556 represent combinations of constraints from instructions and sub-registers.
557 The synthetic register classes inherit most of their properties form their
558 closest user-defined super-class.</li>
Jakob Stoklund Olesend9e5c762012-01-05 00:26:49 +0000[diff] [blame]559 <li><code>MachineRegisterInfo</code> now allows the reserved registers to be
Bill Wendling190ec9b2012-02-16 10:23:43 +0000[diff] [blame]560 frozen when register allocation starts. Target hooks should use the
Nadav Rotemfdc309c2012-02-26 08:35:53 +0000[diff] [blame]561 <code>MRI-&gt;canReserveReg(FramePtr)</code> method to avoid accidentally
Bill Wendling190ec9b2012-02-16 10:23:43 +0000[diff] [blame]562 disabling frame pointer elimination during register allocation.</li>
Jakob Stoklund Olesen7739cad2012-01-16 19:22:00 +0000[diff] [blame]563 <li>A new kind of <code>MachineOperand</code> provides a compact
Bill Wendling190ec9b2012-02-16 10:23:43 +0000[diff] [blame]564 representation of large clobber lists on call instructions. The register
565 mask operand references a bit mask of preserved registers. Everything else
566 is clobbered.</li>
Benjamin Kramer3a2d5652012-05-13 13:10:35 +0000[diff] [blame]567 <li>The DWARF debug info writer gained support for emitting data for the
568 <a href="SourceLevelDebugging.html#acceltable">name accelerator tables
569 DWARF extension</a>. It is used by LLDB to speed up name lookup.</li>
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]570</ul>
Bill Wendling190ec9b2012-02-16 10:23:43 +0000[diff] [blame]571
Anshuman Dasgupta4b479552012-04-12 15:17:35 +0000[diff] [blame]572<p> We added new TableGen infrastructure to support bundling for
573 Very Long Instruction Word (VLIW) architectures. TableGen can now
574 automatically generate a deterministic finite automaton from a VLIW
575 target's schedule description which can be queried to determine
576 legal groupings of instructions in a bundle.</p>
577
Anshuman Dasgupta3c1ded22012-04-14 20:59:13 +0000[diff] [blame]578<p> We have added a new target independent VLIW packetizer based on the
Anshuman Dasguptacff391a2012-04-14 20:57:13 +0000[diff] [blame]579 DFA infrastructure to group machine instructions into bundles.</p>
580
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]581</div>
582
Chandler Carruth268fde42012-04-17 01:10:35 +0000[diff] [blame]583<h4>
584<a name="blockplacement">Basic Block Placement</a>
585</h4>
586<div>
587<p>A probability based block placement and code layout algorithm was added to
588LLVM's code generator. This layout pass supports probabilities derived from
589static heuristics as well as source code annotations such as
590<code>__builtin_expect</code>.</p>
591</div>
592
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]593<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]594<h3>
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]595<a name="x86">X86-32 and X86-64 Target Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]596</h3>
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]597
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]598<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]599
600<p>New features and major changes in the X86 target include:</p>
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]601
602<ul>
Benjamin Kramer3a2d5652012-05-13 13:10:35 +0000[diff] [blame]603 <li>Greatly improved support for AVX2.</li>
604 <li>Lots of bug fixes and improvements for AVX1.</li>
605 <li>Support for the FMA4 and XOP instruction set extensions.</li>
Jakob Stoklund Olesen26246612012-02-16 18:22:39 +0000[diff] [blame]606 <li>Call instructions use the new register mask operands for faster compile
607 times and better support for different calling conventions. The old WINCALL
608 instructions are no longer needed.</li>
NAKAMURA Takumi847307a2012-04-07 02:24:20 +0000[diff] [blame]609 <li>DW2 Exception Handling is enabled on Cygwin and MinGW.</li>
Benjamin Kramer3a2d5652012-05-13 13:10:35 +0000[diff] [blame]610 <li>Support for implicit TLS model used with MSVC runtime.</li>
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]611</ul>
612
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]613</div>
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]614
615<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]616<h3>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]617<a name="ARM">ARM Target Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]618</h3>
Chris Lattnerc441fb82009-03-01 02:30:21 +0000[diff] [blame]619
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]620<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]621
622<p>New features of the ARM target include:</p>
Chris Lattnerc441fb82009-03-01 02:30:21 +0000[diff] [blame]623
624<ul>
Jakob Stoklund Olesenf5bb45f2011-12-16 16:07:41 +0000[diff] [blame]625 <li>The constant island pass now supports basic block and constant pool entry
Jim Grosbach6e6b8222012-02-23 23:52:06 +0000[diff] [blame]626 alignments greater than 4 bytes.</li>
627 <li>On Darwin, the ARM target now has a full-featured integrated assembler.
628 </li>
629</ul>
Chris Lattner7b95c382011-11-15 22:23:46 +0000[diff] [blame]630
Jim Grosbach6e6b8222012-02-23 23:52:06 +0000[diff] [blame]631<h4>
632<a name="armintegratedassembler">ARM Integrated Assembler</a>
633</h4>
634<div>
635<p>The ARM target now includes a full featured macro assembler, including
636direct-to-object module support for clang. The assembler is currently enabled
637by default for Darwin only pending testing and any additional necessary
638platform specific support for Linux.</p>
Michael J. Spencer60f790c2011-11-28 18:20:09 +0000[diff] [blame]639
Jim Grosbach6e6b8222012-02-23 23:52:06 +0000[diff] [blame]640<p>Full support is included for Thumb1, Thumb2 and ARM modes, along with
641subtarget and CPU specific extensions for VFP2, VFP3 and NEON.</p>
642
643<p>The assembler is Unified Syntax only (see ARM Architecural Reference Manual
644for details). While there is some, and growing, support for pre-unfied (divided)
645syntax, there are still significant gaps in that support.</p>
646</div>
NAKAMURA Takumi9c55f592012-03-27 11:25:16 +0000[diff] [blame]647
648</div>
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]649<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]650<h3>
Akira Hatanaka5381cbf2011-11-15 21:33:05 +0000[diff] [blame]651<a name="MIPS">MIPS Target Improvements</a>
652</h3>
653
654<div>
655
Chris Lattner1cc489b2011-11-27 22:12:32 +0000[diff] [blame]656<p>This release has seen major new work on just about every aspect of the MIPS
657 backend. Some of the major new features include:</p>
Akira Hatanaka5381cbf2011-11-15 21:33:05 +0000[diff] [blame]658
659<ul>
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]660 <li>....</li>
Akira Hatanaka5381cbf2011-11-15 21:33:05 +0000[diff] [blame]661</ul>
662</div>
Chris Lattner7b95c382011-11-15 22:23:46 +0000[diff] [blame]663
664<!--=========================================================================-->
665<h3>
Justin Holewinskidc23c142012-05-13 17:32:35 +0000[diff] [blame]666<a name="PTX">PTX Target Improvements</a>
667</h3>
668
669<div>
670
671<p>An outstanding conditional inversion bug was fixed in this release.</p>
672
673<p><b>NOTE</b>: LLVM 3.1 marks the last release of the PTX back-end, in its
674 current form. The back-end is currently being replaced by the NVPTX
675 back-end, currently in SVN ToT.</p>
676
677</div>
678
679<!--=========================================================================-->
680<h3>
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]681<a name="OtherTS">Other Target Specific Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]682</h3>
Chris Lattnerc441fb82009-03-01 02:30:21 +0000[diff] [blame]683
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]684<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]685
Tony Linthicume05e55d2012-04-13 19:09:44 +0000[diff] [blame]686<p>Support for Qualcomm's Hexagon VLIW processor has been added.</p>
687
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]688<ul>
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]689 <li>....</li>
Michael J. Spencer60f790c2011-11-28 18:20:09 +0000[diff] [blame]690
Chris Lattnerd6cc2c22011-11-27 22:36:22 +0000[diff] [blame]691
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]692</ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]693
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]694</div>
Chris Lattner77d29b12008-06-05 08:02:49 +0000[diff] [blame]695
696<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]697<h3>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]698<a name="changes">Major Changes and Removed Features</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]699</h3>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]700
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]701<div>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]702
Bill Wendling2626dba2011-08-03 22:18:20 +0000[diff] [blame]703<p>If you're already an LLVM user or developer with out-of-tree changes based on
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]704 LLVM 3.1, this section lists some "gotchas" that you may run into upgrading
Bill Wendling2626dba2011-08-03 22:18:20 +0000[diff] [blame]705 from the previous release.</p>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]706
707<ul>
Benjamin Kramer2fb68012012-05-13 11:46:05 +0000[diff] [blame]708 <li>LLVM's build system now requires a python 2 interpreter to be present at
709 build time. A perl interpreter is no longer required.</li>
Benjamin Kramer5fdfaf52012-05-13 11:28:46 +0000[diff] [blame]710 <li>The C backend has been removed. It had numerous problems, to the point of
711 not being able to compile any nontrivial program.</li>
712 <li>The Alpha, Blackfin and SystemZ targets have been removed due to lack of
713 maintenance.</li>
Bill Wendling190ec9b2012-02-16 10:23:43 +0000[diff] [blame]714 <li>LLVM 3.1 removes support for reading LLVM 2.9 bitcode files. Going
715 forward, we aim for all future versions of LLVM to read bitcode files and
716 <tt>.ll</tt> files produced by LLVM 3.0 and later.</li>
717 <li>The <tt>unwind</tt> instruction is now gone. With the introduction of the
718 new exception handling system in LLVM 3.0, the <tt>unwind</tt> instruction
719 became obsolete.</li>
Joerg Sonnenbergerdba86d82012-04-26 20:10:07 +0000[diff] [blame]720 <li>LLVM 3.0 and earlier automatically added the returns_twice fo functions
721 like setjmp based on the name. This functionality was removed in 3.1.
722 This affects Clang users, if -ffreestanding is used.</li>
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]723 <li>....</li>
Devang Patelb34dd132008-10-14 20:03:43 +0000[diff] [blame]724</ul>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]725
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]726</div>
727
Daniel Dunbarf0233c62010-10-04 20:11:41 +0000[diff] [blame]728<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]729<h3>
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]730<a name="api_changes">Internal API Changes</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]731</h3>
Daniel Dunbarf0233c62010-10-04 20:11:41 +0000[diff] [blame]732
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]733<div>
Daniel Dunbarf0233c62010-10-04 20:11:41 +0000[diff] [blame]734
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]735<p>In addition, many APIs have changed in this release. Some of the major
Bill Wendling16005252011-08-02 06:20:17 +0000[diff] [blame]736 LLVM API changes are:</p>
Daniel Dunbarf0233c62010-10-04 20:11:41 +0000[diff] [blame]737
738<ul>
Nick Lewycky98a92d12012-03-21 22:58:28 +0000[diff] [blame]739 <li>Target specific options have been moved from global variables to members
740 on the new <code>TargetOptions</code> class, which is local to each
741 <code>TargetMachine</code>. As a consequence, the associated flags will
742 no longer be accepted by <tt>clang -mllvm</tt>. This includes:
743<ul>
Nick Lewycky8a618a22012-03-23 00:56:26 +0000[diff] [blame]744<li><code>llvm::PrintMachineCode</code></li>
745<li><code>llvm::NoFramePointerElim</code></li>
746<li><code>llvm::NoFramePointerElimNonLeaf</code></li>
747<li><code>llvm::DisableFramePointerElim(const MachineFunction &)</code></li>
748<li><code>llvm::LessPreciseFPMADOption</code></li>
749<li><code>llvm::LessPrecideFPMAD()</code></li>
750<li><code>llvm::NoExcessFPPrecision</code></li>
751<li><code>llvm::UnsafeFPMath</code></li>
752<li><code>llvm::NoInfsFPMath</code></li>
753<li><code>llvm::NoNaNsFPMath</code></li>
754<li><code>llvm::HonorSignDependentRoundingFPMathOption</code></li>
755<li><code>llvm::HonorSignDependentRoundingFPMath()</code></li>
756<li><code>llvm::UseSoftFloat</code></li>
757<li><code>llvm::FloatABIType</code></li>
758<li><code>llvm::NoZerosInBSS</code></li>
759<li><code>llvm::JITExceptionHandling</code></li>
760<li><code>llvm::JITEmitDebugInfo</code></li>
761<li><code>llvm::JITEmitDebugInfoToDisk</code></li>
762<li><code>llvm::GuaranteedTailCallOpt</code></li>
763<li><code>llvm::StackAlignmentOverride</code></li>
764<li><code>llvm::RealignStack</code></li>
765<li><code>llvm::DisableJumpTables</code></li>
766<li><code>llvm::EnableFastISel</code></li>
767<li><code>llvm::getTrapFunctionName()</code></li>
768<li><code>llvm::EnableSegmentedStacks</code></li>
Nick Lewycky98a92d12012-03-21 22:58:28 +0000[diff] [blame]769</ul></li>
Duncan Sandse747fad2012-04-15 18:03:49 +0000[diff] [blame]770 <li>The MDBuilder class has been added to simplify the creation of
771 metadata.</li>
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]772 <li>....</li>
Daniel Dunbarf0233c62010-10-04 20:11:41 +0000[diff] [blame]773</ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]774
Daniel Dunbarf0233c62010-10-04 20:11:41 +0000[diff] [blame]775</div>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]776
Nadav Rotemfdc309c2012-02-26 08:35:53 +0000[diff] [blame]777<!--=========================================================================-->
778<h3>
779<a name="tools_changes">Tools Changes</a>
780</h3>
781
782<div>
783
784<p>In addition, some tools have changed in this release. Some of the changes
785 are:</p>
786
787
788<ul>
Benjamin Kramer5fdfaf52012-05-13 11:28:46 +0000[diff] [blame]789 <li><tt>llvm-stress</tt> is a command line tool for generating random
790 <tt>.ll</tt> files to fuzz different LLVM components. </li>
791 <li>The <tt>llvm-ld</tt> tool has been removed. The clang driver provides a
792 more reliable solution for turning a set of bitcode files into a binary.
793 To merge bitcode files <tt>llvm-link</tt> can be used instead.</li>
Nadav Rotemfdc309c2012-02-26 08:35:53 +0000[diff] [blame]794 <li>....</li>
795</ul>
796
797</div>
798
Gregory Szorcca347492012-05-12 21:12:22 +0000[diff] [blame]799
800<!--=========================================================================-->
801<h3>
802<a name="python">Python Bindings</a>
803</h3>
804
805<div>
806
807<p>Officially supported Python bindings have been added! Feature support is far
808from complete. The current bindings support interfaces to:</p>
809<ul>
810 <li>Object File Interface</li>
811 <li>Disassembler</li>
812</ul>
813
814<p>Using the Object File Interface, it is possible to inspect binary object files.
815Think of it as a Python version of readelf or llvm-objdump.</p>
816
817<p>Support for additional features is currently being developed by community
818contributors. If you are interested in shaping the direction of the Python
819bindings, please express your intent on IRC or the developers list.</p>
820
821</div>
822
Nadav Rotemfdc309c2012-02-26 08:35:53 +0000[diff] [blame]823</div>
824
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]825<!-- *********************************************************************** -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]826<h2>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]827 <a name="knownproblems">Known Problems</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]828</h2>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]829<!-- *********************************************************************** -->
830
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]831<div>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]832
Chris Lattner70e22012011-11-27 19:38:20 +0000[diff] [blame]833<p>LLVM is generally a production quality compiler, and is used by a broad range
834 of applications and shipping in many products. That said, not every
835 subsystem is as mature as the aggregate, particularly the more obscure
836 targets. If you run into a problem, please check the <a
837 href="http://llvm.org/bugs/">LLVM bug database</a> and submit a bug if
838 there isn't already one or ask on the <a
839 href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVMdev
840 list</a>.</p>
Michael J. Spencer60f790c2011-11-28 18:20:09 +0000[diff] [blame]841
Chris Lattner70e22012011-11-27 19:38:20 +0000[diff] [blame]842 <p>Known problem areas include:</p>
Michael J. Spencer60f790c2011-11-28 18:20:09 +0000[diff] [blame]843
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]844<ul>
Benjamin Kramer5fdfaf52012-05-13 11:28:46 +0000[diff] [blame]845 <li>The CellSPU, MSP430, PTX and XCore backends are experimental.</li>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]846
Chris Lattner70e22012011-11-27 19:38:20 +0000[diff] [blame]847 <li>The integrated assembler, disassembler, and JIT is not supported by
848 several targets. If an integrated assembler is not supported, then a
849 system assembler is required. For more details, see the <a
850 href="CodeGenerator.html#targetfeatures">Target Features Matrix</a>.
851 </li>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]852</ul>
853
854</div>
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]855
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]856<!-- *********************************************************************** -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]857<h2>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]858 <a name="additionalinfo">Additional Information</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]859</h2>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]860<!-- *********************************************************************** -->
861
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]862<div>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]863
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]864<p>A wide variety of additional information is available on
865 the <a href="http://llvm.org/">LLVM web page</a>, in particular in
866 the <a href="http://llvm.org/docs/">documentation</a> section. The web page
867 also contains versions of the API documentation which is up-to-date with the
868 Subversion version of the source code. You can access versions of these
869 documents specific to this release by going into the "<tt>llvm/doc/</tt>"
870 directory in the LLVM tree.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]871
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]872<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]873 us via the <a href="http://llvm.org/docs/#maillist"> mailing lists</a>.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]874
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]875</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]876
877<!-- *********************************************************************** -->
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]878
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]879<hr>
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]880<address>
Misha Brukman38847d52003-12-21 22:53:21 +0000[diff] [blame]881 <a href="http://jigsaw.w3.org/css-validator/check/referer"><img
Misha Brukman44408702008-12-11 17:34:48 +0000[diff] [blame]882 src="http://jigsaw.w3.org/css-validator/images/vcss-blue" alt="Valid CSS"></a>
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]883 <a href="http://validator.w3.org/check/referer"><img
Misha Brukman44408702008-12-11 17:34:48 +0000[diff] [blame]884 src="http://www.w3.org/Icons/valid-html401-blue" alt="Valid HTML 4.01"></a>
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]885
Chris Lattnerb4b0ce72007-05-18 00:44:29 +0000[diff] [blame]886 <a href="http://llvm.org/">LLVM Compiler Infrastructure</a><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]887 Last modified: $Date$
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]888</address>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]889
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]890</body>
891</html>