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gerrit-public.fairphone.software / fp2-dev / platform / external / llvm / acc472a4fe1cce522e74b4c8812ee218cf91cc71 / . / docs / ReleaseNotes.html
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4<head>
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Daniel Dunbaradea4972012-04-19 20:20:34 +0000[diff] [blame]6 <link rel="stylesheet" href="_static/llvm.css" type="text/css">
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]7 <title>LLVM 3.1 Release Notes</title>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]8</head>
9<body>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]10
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]11<h1>LLVM 3.1 Release Notes</h1>
Mikhail Glushenkovea65d7d2008-10-13 02:08:34 +0000[diff] [blame]12
Jakub Staszakf8de54f2011-12-06 23:33:07 +0000[diff] [blame]13<div>
14<img style="float:right" src="http://llvm.org/img/DragonSmall.png"
15 width="136" height="136" alt="LLVM Dragon Logo">
16</div>
Chris Lattner0e464a92010-03-17 04:02:39 +0000[diff] [blame]17
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]18<ol>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]19 <li><a href="#intro">Introduction</a></li>
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]20 <li><a href="#subproj">Sub-project Status Update</a></li>
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]21 <li><a href="#externalproj">External Projects Using LLVM 3.1</a></li>
22 <li><a href="#whatsnew">What's New in LLVM?</a></li>
Chris Lattner4b538b92004-04-30 22:17:12 +0000[diff] [blame]23 <li><a href="GettingStarted.html">Installation Instructions</a></li>
Dan Gohman44aa9212008-10-14 16:23:02 +0000[diff] [blame]24 <li><a href="#knownproblems">Known Problems</a></li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]25 <li><a href="#additionalinfo">Additional Information</a></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]26</ol>
27
Chris Lattner7911ce22004-05-23 21:07:27 +0000[diff] [blame]28<div class="doc_author">
NAKAMURA Takumib9a33632011-04-09 02:13:37 +0000[diff] [blame]29 <p>Written by the <a href="http://llvm.org/">LLVM Team</a></p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]30</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]31
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]32<h1 style="color:red">These are in-progress notes for the upcoming LLVM 3.1
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]33release.<br>
34You may prefer the
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]35<a href="http://llvm.org/releases/3.0/docs/ReleaseNotes.html">LLVM 3.0
Dan Gohmanb44f6c62010-05-03 23:51:05 +0000[diff] [blame]36Release Notes</a>.</h1>
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]37
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]38<!-- *********************************************************************** -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]39<h2>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]40 <a name="intro">Introduction</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]41</h2>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]42<!-- *********************************************************************** -->
43
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]44<div>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]45
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]46<p>This document contains the release notes for the LLVM Compiler
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]47 Infrastructure, release 3.1. Here we describe the status of LLVM, including
Chris Lattner1ab8ce92011-11-27 18:47:37 +0000[diff] [blame]48 major improvements from the previous release, improvements in various
49 subprojects of LLVM, and some of the current users of the code.
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]50 All LLVM releases may be downloaded from
51 the <a href="http://llvm.org/releases/">LLVM releases web site</a>.</p>
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]52
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame]53<p>For more information about LLVM, including information about the latest
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]54 release, please check out the <a href="http://llvm.org/">main LLVM web
55 site</a>. If you have questions or comments,
56 the <a href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVM
57 Developer's Mailing List</a> is a good place to send them.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]58
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]59<p>Note that if you are reading this file from a Subversion checkout or the main
60 LLVM web page, this document applies to the <i>next</i> release, not the
61 current one. To see the release notes for a specific release, please see the
62 <a href="http://llvm.org/releases/">releases page</a>.</p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]63
64</div>
Michael J. Spencer60f790c2011-11-28 18:20:09 +0000[diff] [blame]65
66
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]67<!-- *********************************************************************** -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]68<h2>
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]69 <a name="subproj">Sub-project Status Update</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]70</h2>
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]71<!-- *********************************************************************** -->
Chris Lattnerea34f642008-06-08 21:34:41 +0000[diff] [blame]72
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]73<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]74
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]75<p>The LLVM 3.1 distribution currently consists of code from the core LLVM
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]76 repository (which roughly includes the LLVM optimizers, code generators and
Chris Lattnerc343e312011-11-10 20:15:40 +0000[diff] [blame]77 supporting tools), and the Clang repository. In
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]78 addition to this code, the LLVM Project includes other sub-projects that are
79 in development. Here we include updates on these subprojects.</p>
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]80
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]81<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]82<h3>
Chris Lattnerfb97b2d2008-10-13 18:11:54 +0000[diff] [blame]83<a name="clang">Clang: C/C++/Objective-C Frontend Toolkit</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]84</h3>
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]85
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]86<div>
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]87
Chris Lattner095539f2010-04-26 17:42:18 +0000[diff] [blame]88<p><a href="http://clang.llvm.org/">Clang</a> is an LLVM front end for the C,
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]89 C++, and Objective-C languages. Clang aims to provide a better user
90 experience through expressive diagnostics, a high level of conformance to
91 language standards, fast compilation, and low memory use. Like LLVM, Clang
92 provides a modular, library-based architecture that makes it suitable for
93 creating or integrating with other development tools. Clang is considered a
94 production-quality compiler for C, Objective-C, C++ and Objective-C++ on x86
Chris Lattner1ab8ce92011-11-27 18:47:37 +0000[diff] [blame]95 (32- and 64-bit), and for Darwin/ARM targets.</p>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]96
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]97<p>In the LLVM 3.1 time-frame, the Clang team has made many improvements:</p>
Douglas Gregorba087df2011-10-15 00:48:01 +0000[diff] [blame]98<ul>
Seth Cantrellacc472a2012-05-08 23:34:38 +0000[diff] [blame^]99 <li>C++11 support is greatly expanded including lambdas, initializer lists, constexpr, user-defined literals, and atomics.</li>
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]100 <li>...</li>
Douglas Gregorba087df2011-10-15 00:48:01 +0000[diff] [blame]101</ul>
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]102
103 <p>For more details about the changes to Clang since the 2.9 release, see the
Chandler Carruthcc966de2011-11-29 00:32:43 +0000[diff] [blame]104<a href="http://clang.llvm.org/docs/ReleaseNotes.html">Clang release notes</a>
105</p>
Douglas Gregorba087df2011-10-15 00:48:01 +0000[diff] [blame]106
Michael J. Spencer60f790c2011-11-28 18:20:09 +0000[diff] [blame]107
Duncan Sandsf3ba7af2011-04-06 08:07:40 +0000[diff] [blame]108<p>If Clang rejects your code but another compiler accepts it, please take a
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]109 look at the <a href="http://clang.llvm.org/compatibility.html">language
110 compatibility</a> guide to make sure this is not intentional or a known
111 issue.</p>
Bill Wendling741748a2008-10-27 09:27:33 +0000[diff] [blame]112
Chris Lattnerfb97b2d2008-10-13 18:11:54 +0000[diff] [blame]113</div>
114
115<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]116<h3>
Duncan Sands528a5102011-04-04 11:09:08 +0000[diff] [blame]117<a name="dragonegg">DragonEgg: GCC front-ends, LLVM back-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]118</h3>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]119
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]120<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]121<p><a href="http://dragonegg.llvm.org/">DragonEgg</a> is a
122 <a href="http://gcc.gnu.org/wiki/plugins">gcc plugin</a> that replaces GCC's
Duncan Sands77352c92011-11-10 18:44:29 +0000[diff] [blame]123 optimizers and code generators with LLVM's. It works with gcc-4.5 or gcc-4.6,
124 targets the x86-32 and x86-64 processor families, and has been successfully
125 used on the Darwin, FreeBSD, KFreeBSD, Linux and OpenBSD platforms. It fully
126 supports Ada, C, C++ and Fortran. It has partial support for Go, Java, Obj-C
127 and Obj-C++.</p>
Duncan Sands749fd832010-04-02 09:23:15 +0000[diff] [blame]128
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]129<p>The 3.1 release has the following notable changes:</p>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]130
Chris Lattner1ab8ce92011-11-27 18:47:37 +0000[diff] [blame]131 <ul>
Duncan Sands77352c92011-11-10 18:44:29 +0000[diff] [blame]132
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]133 <li>...</li>
Duncan Sands77352c92011-11-10 18:44:29 +0000[diff] [blame]134
Duncan Sands4b1da2b2010-09-30 17:37:34 +0000[diff] [blame]135</ul>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]136
137</div>
138
Chris Lattner75547712010-10-03 23:49:06 +0000[diff] [blame]139<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]140<h3>
Chris Lattner75547712010-10-03 23:49:06 +0000[diff] [blame]141<a name="compiler-rt">compiler-rt: Compiler Runtime Library</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]142</h3>
Chris Lattner75547712010-10-03 23:49:06 +0000[diff] [blame]143
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]144<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]145
146<p>The new LLVM <a href="http://compiler-rt.llvm.org/">compiler-rt project</a>
147 is a simple library that provides an implementation of the low-level
148 target-specific hooks required by code generation and other runtime
149 components. For example, when compiling for a 32-bit target, converting a
150 double to a 64-bit unsigned integer is compiled into a runtime call to the
151 "__fixunsdfdi" function. The compiler-rt library provides highly optimized
152 implementations of this and other low-level routines (some are 3x faster than
153 the equivalent libgcc routines).</p>
Chris Lattner75547712010-10-03 23:49:06 +0000[diff] [blame]154
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]155<p>....</p>
Chris Lattner75547712010-10-03 23:49:06 +0000[diff] [blame]156
157</div>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]158
159<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]160<h3>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]161<a name="lldb">LLDB: Low Level Debugger</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]162</h3>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]163
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]164<div>
Michael J. Spencer60f790c2011-11-28 18:20:09 +0000[diff] [blame]165
Chris Lattner9e896712011-11-27 18:53:41 +0000[diff] [blame]166<p>LLDB is a ground-up implementation of a command line debugger, as well as a
167 debugger API that can be used from other applications. LLDB makes use of the
168 Clang parser to provide high-fidelity expression parsing (particularly for
169 C++) and uses the LLVM JIT for target support.</p>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]170
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]171<p>...</p>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]172
173</div>
174
175<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]176<h3>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]177<a name="libc++">libc++: C++ Standard Library</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]178</h3>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]179
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]180<div>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]181
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]182<p>Like compiler_rt, libc++ is now <a href="DeveloperPolicy.html#license">dual
183 licensed</a> under the MIT and UIUC license, allowing it to be used more
184 permissively.</p>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]185
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]186<p>...</p>
David Chisnall553284e2011-11-26 10:56:17 +0000[diff] [blame]187
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]188</div>
189
Chris Lattner3d6a80a2011-04-07 03:08:22 +0000[diff] [blame]190<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]191<h3>
Chris Lattner3d6a80a2011-04-07 03:08:22 +0000[diff] [blame]192<a name="vmkit">VMKit</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]193</h3>
Chris Lattner3d6a80a2011-04-07 03:08:22 +0000[diff] [blame]194
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]195<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]196
Nicolas Geoffray54d5df92011-11-10 23:37:56 +0000[diff] [blame]197 <p>The <a href="http://vmkit.llvm.org/">VMKit project</a> is an
198 implementation of a Java Virtual Machine (Java VM or JVM) that uses LLVM for
199 static and just-in-time compilation.
200
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]201 <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]202 runtime and startup performance:</p>
203
204 <ul>
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]205 <li>...</li>
Nicolas Geoffray54d5df92011-11-10 23:37:56 +0000[diff] [blame]206 </ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]207
Chris Lattner3d6a80a2011-04-07 03:08:22 +0000[diff] [blame]208</div>
Michael J. Spencer60f790c2011-11-28 18:20:09 +0000[diff] [blame]209
Tobias Grosser76213b82012-04-16 17:17:00 +0000[diff] [blame]210
211<!--=========================================================================-->
212<h3>
Tobias Grosser99a0b282012-04-16 17:18:49 +0000[diff] [blame]213<a name="Polly">Polly: Polyhedral Optimizer</a>
Tobias Grosser76213b82012-04-16 17:17:00 +0000[diff] [blame]214</h3>
215
216<div>
217
218 <p><a href="http://polly.llvm.org/">Polly</a> is an <em>experimental</em>
219 optimizer for data locality and parallelism. It currently provides high-level
220 loop optimizations and automatic parallelisation (using the OpenMP run time).
221 Work in the area of automatic SIMD and accelerator code generation was
222 started.
223
224 <p>Within the LLVM 3.1 time-frame there were the following highlights:</p>
225
226 <ul>
227 <li>Polly became an official LLVM project</li>
228 <li>Polly can be loaded directly into clang (Enabled by '-O3 -mllvm -polly'
229 )</li>
230 <li>An automatic scheduling optimizer (derived from <a
231 href="http://pluto-compiler.sourceforge.net/">Pluto</a>) was integrated. It
232 performs loop transformations to optimize for data-locality and parallelism.
233 The transformations include, but are not limited to interchange, fusion,
234 fission, skewing and tiling.
235 </li>
236 </ul>
237
238</div>
239
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]240</div>
Daniel Dunbar97b01a82010-10-04 17:39:47 +0000[diff] [blame]241
Chris Lattnerab68e9e2009-02-26 22:33:38 +0000[diff] [blame]242<!-- *********************************************************************** -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]243<h2>
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]244 <a name="externalproj">External Open Source Projects Using LLVM 3.1</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]245</h2>
Chris Lattnerab68e9e2009-02-26 22:33:38 +0000[diff] [blame]246<!-- *********************************************************************** -->
247
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]248<div>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]249
250<p>An exciting aspect of LLVM is that it is used as an enabling technology for
251 a lot of other language and tools projects. This section lists some of the
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]252 projects that have already been updated to work with LLVM 3.1.</p>
Chris Lattner75547712010-10-03 23:49:06 +0000[diff] [blame]253
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]254 ... to be filled in right before the release ...
Bill Wendling644ce532011-10-26 09:25:01 +0000[diff] [blame]255
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]256</div>
257
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]258<!-- *********************************************************************** -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]259<h2>
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]260 <a name="whatsnew">What's New in LLVM 3.1?</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]261</h2>
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]262<!-- *********************************************************************** -->
263
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]264<div>
Chris Lattnerf8e0b4e2008-06-08 22:59:35 +0000[diff] [blame]265
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]266<p>This release includes a huge number of bug fixes, performance tweaks and
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]267 minor improvements. Some of the major improvements and new features are
268 listed in this section.</p>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]269
Chris Lattner914ce462010-04-22 06:28:20 +0000[diff] [blame]270<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]271<h3>
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]272<a name="majorfeatures">Major New Features</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]273</h3>
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]274
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]275<div>
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]276
Chris Lattner1ab8ce92011-11-27 18:47:37 +0000[diff] [blame]277 <!-- Features that need text if they're finished for 3.1:
278 ARM EHABI
279 combiner-aa?
280 strong phi elim
281 loop dependence analysis
282 CorrelatedValuePropagation
283 lib/Transforms/IPO/MergeFunctions.cpp => consider for 3.1.
Chris Lattner1c80fbf2011-11-27 20:51:47 +0000[diff] [blame]284 Integrated assembler on by default for arm/thumb?
285
Chris Lattner1ab8ce92011-11-27 18:47:37 +0000[diff] [blame]286 -->
287
Chris Lattner1c80fbf2011-11-27 20:51:47 +0000[diff] [blame]288 <!-- Near dead:
Chris Lattnerdec23b62011-11-15 22:13:27 +0000[diff] [blame]289 Analysis/RegionInfo.h + Dom Frontiers
290 SparseBitVector: used in LiveVar.
Chris Lattner5a1731d2011-11-27 08:32:32 +0000[diff] [blame]291 llvm/lib/Archive - replace with lib object?
Chris Lattner1c80fbf2011-11-27 20:51:47 +0000[diff] [blame]292 -->
Chris Lattner6a007d12011-11-25 20:33:27 +0000[diff] [blame]293
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]294<p>LLVM 3.1 includes several major changes and big features:</p>
Bill Wendlingbc5f6dd2011-10-26 18:33:01 +0000[diff] [blame]295
Chris Lattner791f77b2008-06-05 06:25:56 +0000[diff] [blame]296<ul>
Evan Cheng28681862011-12-14 22:57:45 +0000[diff] [blame]297 <li><a href="../tools/clang/docs/AddressSanitizer.html">AddressSanitizer</a>,
298 a fast memory error detector.</li>
299 <li><a href="CodeGenerator.html#machineinstrbundle">MachineInstr Bundles</a>,
300 Support to model instruction bundling / packing.</li>
Jim Grosbach6e6b8222012-02-23 23:52:06 +0000[diff] [blame]301 <li><a href="#armintegratedassembler">ARM Integrated Assembler</a>,
302 A full featured assembler and direct-to-object support for ARM.</li>
Chandler Carruth268fde42012-04-17 01:10:35 +0000[diff] [blame]303 <li><a href="#blockplacement">Basic Block Placement</a>
304 Probability driven basic block placement.</li>
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]305 <li>....</li>
Chris Lattnerf304ffc2008-02-10 08:17:19 +0000[diff] [blame]306</ul>
Mikhail Glushenkovea65d7d2008-10-13 02:08:34 +0000[diff] [blame]307
Bill Wendlingbc5f6dd2011-10-26 18:33:01 +0000[diff] [blame]308</div>
309
Michael J. Spencer60f790c2011-11-28 18:20:09 +0000[diff] [blame]310
Chris Lattner4f0fe432011-11-27 19:26:30 +0000[diff] [blame]311<!--=========================================================================-->
312<h3>
313<a name="coreimprovements">LLVM IR and Core Improvements</a>
314</h3>
315
316<div>
317
318<p>LLVM IR has several new features for better support of new targets and that
319 expose new optimization opportunities:</p>
320
Chris Lattner064caf92011-11-27 21:30:28 +0000[diff] [blame]321 <ul>
Dan Gohmaneb4c70b2011-12-20 01:10:56 +0000[diff] [blame]322 <li>IR support for half float</li>
Bill Wendling06d7e1b2012-02-06 21:59:44 +0000[diff] [blame]323 <li>IR support for vectors of pointers, including vector GEPs.</li>
Bill Wendling190ec9b2012-02-16 10:23:43 +0000[diff] [blame]324 <li>Module flags have been introduced. They convey information about the
325 module as a whole to LLVM subsystems.</li>
Rafael Espindola626c3462012-03-25 11:14:35 +0000[diff] [blame]326 <li>Loads can now have range metadata attached to them to describe the
Rafael Espindola692cd452012-03-24 19:02:32 +0000[diff] [blame]327 possible values being loaded.</li>
Chandler Carruthc76c94f2012-04-17 01:13:53 +0000[diff] [blame]328 <li>Inline cost heuristics have been completely overhauled and now closely
329 model constant propagation through call sites, disregard trivially dead
330 code costs, and can model C++ STL iterator patterns.</li>
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]331 <li>....</li>
Chris Lattner064caf92011-11-27 21:30:28 +0000[diff] [blame]332 </ul>
Andrew Trick5aab6382011-11-06 17:59:24 +0000[diff] [blame]333</div>
334
335<!--=========================================================================-->
336<h3>
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]337<a name="optimizer">Optimizer Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]338</h3>
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]339
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]340<div>
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]341
Chris Lattner064caf92011-11-27 21:30:28 +0000[diff] [blame]342<p>In addition to many minor performance tweaks and bug fixes, this
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]343 release includes a few major enhancements and additions to the
344 optimizers:</p>
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]345
346<ul>
Brendon Cahoonff730392012-04-14 16:54:12 +0000[diff] [blame]347 <li>The loop unroll pass now is able to unroll loops with run-time trip counts.
348 This feature is turned off by default, and is enabled with the
349 <code>-unroll-runtime</code> flag.</li>
Hal Finkel9068bf52012-04-16 03:49:43 +0000[diff] [blame]350 <li>A new basic-block autovectorization pass is available. Pass
351 <code>-vectorize</code> to run this pass along with some associated
Hal Finkel12c10b32012-04-16 17:06:49 +0000[diff] [blame]352 post-vectorization cleanup passes. For more information, see the EuroLLVM
353 2012 slides: <a href="http://llvm.org/devmtg/2012-04-12/Slides/Hal_Finkel.pdf">
354 Autovectorization with LLVM</a>.</li>
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]355 <li>....</li>
Chris Lattner11b66112010-10-04 02:42:39 +0000[diff] [blame]356</ul>
357
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]358</div>
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]359
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]360<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]361<h3>
Chris Lattner4ba2b652010-09-30 16:31:33 +0000[diff] [blame]362<a name="mc">MC Level Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]363</h3>
Chris Lattner4ba2b652010-09-30 16:31:33 +0000[diff] [blame]364
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]365<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]366
367<p>The LLVM Machine Code (aka MC) subsystem was created to solve a number of
368 problems in the realm of assembly, disassembly, object file format handling,
369 and a number of other related areas that CPU instruction-set level tools work
Chris Lattner2f206022011-11-27 22:03:34 +0000[diff] [blame]370 in. For more information, please see
371 the <a href="http://blog.llvm.org/2010/04/intro-to-llvm-mc-project.html">Intro
372 to the LLVM MC Project Blog Post</a>.</p>
Chris Lattner7d9b6b42010-10-02 21:59:30 +0000[diff] [blame]373
Chris Lattner7d9b6b42010-10-02 21:59:30 +0000[diff] [blame]374<ul>
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]375 <li>....</li>
Chris Lattner7d9b6b42010-10-02 21:59:30 +0000[diff] [blame]376</ul>
377
NAKAMURA Takumi45c435a2011-04-05 08:24:22 +0000[diff] [blame]378</div>
Chris Lattner4ba2b652010-09-30 16:31:33 +0000[diff] [blame]379
Chris Lattner4ba2b652010-09-30 16:31:33 +0000[diff] [blame]380<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]381<h3>
Chris Lattner511433e2009-03-02 03:24:11 +0000[diff] [blame]382<a name="codegen">Target Independent Code Generator Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]383</h3>
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]384
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]385<div>
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]386
Bill Wendling190ec9b2012-02-16 10:23:43 +0000[diff] [blame]387<p>We have changed the way that the Type Legalizer legalizes vectors. The type
388 legalizer now attempts to promote integer elements. This enabled the
389 implementation of vector-select. Additionally, we see a performance boost on
390 workloads which use vectors of chars and shorts, since they are now promoted
391 to 32-bit types, which are better supported by the SIMD instruction set.
392 Floating point types are still widened as before.</p>
Nadav Rotem75597662011-12-20 08:02:50 +0000[diff] [blame]393
394
Mikhail Glushenkovf795ef02009-03-01 18:09:47 +0000[diff] [blame]395<p>We have put a significant amount of work into the code generator
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]396 infrastructure, which allows us to implement more aggressive algorithms and
397 make it run faster:</p>
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]398
399<ul>
Jakob Stoklund Olesen9897c622011-12-19 16:53:40 +0000[diff] [blame]400 <li>TableGen can now synthesize register classes that are only needed to
Bill Wendling190ec9b2012-02-16 10:23:43 +0000[diff] [blame]401 represent combinations of constraints from instructions and sub-registers.
402 The synthetic register classes inherit most of their properties form their
403 closest user-defined super-class.</li>
Jakob Stoklund Olesend9e5c762012-01-05 00:26:49 +0000[diff] [blame]404 <li><code>MachineRegisterInfo</code> now allows the reserved registers to be
Bill Wendling190ec9b2012-02-16 10:23:43 +0000[diff] [blame]405 frozen when register allocation starts. Target hooks should use the
Nadav Rotemfdc309c2012-02-26 08:35:53 +0000[diff] [blame]406 <code>MRI-&gt;canReserveReg(FramePtr)</code> method to avoid accidentally
Bill Wendling190ec9b2012-02-16 10:23:43 +0000[diff] [blame]407 disabling frame pointer elimination during register allocation.</li>
Jakob Stoklund Olesen7739cad2012-01-16 19:22:00 +0000[diff] [blame]408 <li>A new kind of <code>MachineOperand</code> provides a compact
Bill Wendling190ec9b2012-02-16 10:23:43 +0000[diff] [blame]409 representation of large clobber lists on call instructions. The register
410 mask operand references a bit mask of preserved registers. Everything else
411 is clobbered.</li>
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]412</ul>
Bill Wendling190ec9b2012-02-16 10:23:43 +0000[diff] [blame]413
Anshuman Dasgupta4b479552012-04-12 15:17:35 +0000[diff] [blame]414<p> We added new TableGen infrastructure to support bundling for
415 Very Long Instruction Word (VLIW) architectures. TableGen can now
416 automatically generate a deterministic finite automaton from a VLIW
417 target's schedule description which can be queried to determine
418 legal groupings of instructions in a bundle.</p>
419
Anshuman Dasgupta3c1ded22012-04-14 20:59:13 +0000[diff] [blame]420<p> We have added a new target independent VLIW packetizer based on the
Anshuman Dasguptacff391a2012-04-14 20:57:13 +0000[diff] [blame]421 DFA infrastructure to group machine instructions into bundles.</p>
422
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]423</div>
424
Chandler Carruth268fde42012-04-17 01:10:35 +0000[diff] [blame]425<h4>
426<a name="blockplacement">Basic Block Placement</a>
427</h4>
428<div>
429<p>A probability based block placement and code layout algorithm was added to
430LLVM's code generator. This layout pass supports probabilities derived from
431static heuristics as well as source code annotations such as
432<code>__builtin_expect</code>.</p>
433</div>
434
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]435<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]436<h3>
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]437<a name="x86">X86-32 and X86-64 Target Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]438</h3>
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]439
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]440<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]441
442<p>New features and major changes in the X86 target include:</p>
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]443
444<ul>
Nadav Rotem75597662011-12-20 08:02:50 +0000[diff] [blame]445 <li>Bug fixes and improved support for AVX1</li>
446 <li>Support for AVX2 (still incomplete at this point)</li>
Jakob Stoklund Olesen26246612012-02-16 18:22:39 +0000[diff] [blame]447 <li>Call instructions use the new register mask operands for faster compile
448 times and better support for different calling conventions. The old WINCALL
449 instructions are no longer needed.</li>
NAKAMURA Takumi847307a2012-04-07 02:24:20 +0000[diff] [blame]450 <li>DW2 Exception Handling is enabled on Cygwin and MinGW.</li>
Bill Wendling59fc1662012-04-16 05:24:52 +0000[diff] [blame]451 <li>Support for implicit TLS model used with MS VC runtime</li>
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]452</ul>
453
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]454</div>
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]455
456<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]457<h3>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]458<a name="ARM">ARM Target Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]459</h3>
Chris Lattnerc441fb82009-03-01 02:30:21 +0000[diff] [blame]460
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]461<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]462
463<p>New features of the ARM target include:</p>
Chris Lattnerc441fb82009-03-01 02:30:21 +0000[diff] [blame]464
465<ul>
Jakob Stoklund Olesenf5bb45f2011-12-16 16:07:41 +0000[diff] [blame]466 <li>The constant island pass now supports basic block and constant pool entry
Jim Grosbach6e6b8222012-02-23 23:52:06 +0000[diff] [blame]467 alignments greater than 4 bytes.</li>
468 <li>On Darwin, the ARM target now has a full-featured integrated assembler.
469 </li>
470</ul>
Chris Lattner7b95c382011-11-15 22:23:46 +0000[diff] [blame]471
Jim Grosbach6e6b8222012-02-23 23:52:06 +0000[diff] [blame]472<h4>
473<a name="armintegratedassembler">ARM Integrated Assembler</a>
474</h4>
475<div>
476<p>The ARM target now includes a full featured macro assembler, including
477direct-to-object module support for clang. The assembler is currently enabled
478by default for Darwin only pending testing and any additional necessary
479platform specific support for Linux.</p>
Michael J. Spencer60f790c2011-11-28 18:20:09 +0000[diff] [blame]480
Jim Grosbach6e6b8222012-02-23 23:52:06 +0000[diff] [blame]481<p>Full support is included for Thumb1, Thumb2 and ARM modes, along with
482subtarget and CPU specific extensions for VFP2, VFP3 and NEON.</p>
483
484<p>The assembler is Unified Syntax only (see ARM Architecural Reference Manual
485for details). While there is some, and growing, support for pre-unfied (divided)
486syntax, there are still significant gaps in that support.</p>
487</div>
NAKAMURA Takumi9c55f592012-03-27 11:25:16 +0000[diff] [blame]488
489</div>
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]490<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]491<h3>
Akira Hatanaka5381cbf2011-11-15 21:33:05 +0000[diff] [blame]492<a name="MIPS">MIPS Target Improvements</a>
493</h3>
494
495<div>
496
Chris Lattner1cc489b2011-11-27 22:12:32 +0000[diff] [blame]497<p>This release has seen major new work on just about every aspect of the MIPS
498 backend. Some of the major new features include:</p>
Akira Hatanaka5381cbf2011-11-15 21:33:05 +0000[diff] [blame]499
500<ul>
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]501 <li>....</li>
Akira Hatanaka5381cbf2011-11-15 21:33:05 +0000[diff] [blame]502</ul>
503</div>
Chris Lattner7b95c382011-11-15 22:23:46 +0000[diff] [blame]504
505<!--=========================================================================-->
506<h3>
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]507<a name="OtherTS">Other Target Specific Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]508</h3>
Chris Lattnerc441fb82009-03-01 02:30:21 +0000[diff] [blame]509
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]510<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]511
Tony Linthicume05e55d2012-04-13 19:09:44 +0000[diff] [blame]512<p>Support for Qualcomm's Hexagon VLIW processor has been added.</p>
513
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]514<ul>
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]515 <li>....</li>
Michael J. Spencer60f790c2011-11-28 18:20:09 +0000[diff] [blame]516
Chris Lattnerd6cc2c22011-11-27 22:36:22 +0000[diff] [blame]517
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]518</ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]519
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]520</div>
Chris Lattner77d29b12008-06-05 08:02:49 +0000[diff] [blame]521
522<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]523<h3>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]524<a name="changes">Major Changes and Removed Features</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]525</h3>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]526
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]527<div>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]528
Bill Wendling2626dba2011-08-03 22:18:20 +0000[diff] [blame]529<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]530 LLVM 3.1, this section lists some "gotchas" that you may run into upgrading
Bill Wendling2626dba2011-08-03 22:18:20 +0000[diff] [blame]531 from the previous release.</p>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]532
533<ul>
Bill Wendling190ec9b2012-02-16 10:23:43 +0000[diff] [blame]534 <li>LLVM 3.1 removes support for reading LLVM 2.9 bitcode files. Going
535 forward, we aim for all future versions of LLVM to read bitcode files and
536 <tt>.ll</tt> files produced by LLVM 3.0 and later.</li>
537 <li>The <tt>unwind</tt> instruction is now gone. With the introduction of the
538 new exception handling system in LLVM 3.0, the <tt>unwind</tt> instruction
539 became obsolete.</li>
Joerg Sonnenbergerdba86d82012-04-26 20:10:07 +0000[diff] [blame]540 <li>LLVM 3.0 and earlier automatically added the returns_twice fo functions
541 like setjmp based on the name. This functionality was removed in 3.1.
542 This affects Clang users, if -ffreestanding is used.</li>
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]543 <li>....</li>
Devang Patelb34dd132008-10-14 20:03:43 +0000[diff] [blame]544</ul>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]545
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]546</div>
547
Daniel Dunbarf0233c62010-10-04 20:11:41 +0000[diff] [blame]548<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]549<h3>
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]550<a name="api_changes">Internal API Changes</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]551</h3>
Daniel Dunbarf0233c62010-10-04 20:11:41 +0000[diff] [blame]552
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]553<div>
Daniel Dunbarf0233c62010-10-04 20:11:41 +0000[diff] [blame]554
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]555<p>In addition, many APIs have changed in this release. Some of the major
Bill Wendling16005252011-08-02 06:20:17 +0000[diff] [blame]556 LLVM API changes are:</p>
Daniel Dunbarf0233c62010-10-04 20:11:41 +0000[diff] [blame]557
558<ul>
Nick Lewycky98a92d12012-03-21 22:58:28 +0000[diff] [blame]559 <li>Target specific options have been moved from global variables to members
560 on the new <code>TargetOptions</code> class, which is local to each
561 <code>TargetMachine</code>. As a consequence, the associated flags will
562 no longer be accepted by <tt>clang -mllvm</tt>. This includes:
563<ul>
Nick Lewycky8a618a22012-03-23 00:56:26 +0000[diff] [blame]564<li><code>llvm::PrintMachineCode</code></li>
565<li><code>llvm::NoFramePointerElim</code></li>
566<li><code>llvm::NoFramePointerElimNonLeaf</code></li>
567<li><code>llvm::DisableFramePointerElim(const MachineFunction &)</code></li>
568<li><code>llvm::LessPreciseFPMADOption</code></li>
569<li><code>llvm::LessPrecideFPMAD()</code></li>
570<li><code>llvm::NoExcessFPPrecision</code></li>
571<li><code>llvm::UnsafeFPMath</code></li>
572<li><code>llvm::NoInfsFPMath</code></li>
573<li><code>llvm::NoNaNsFPMath</code></li>
574<li><code>llvm::HonorSignDependentRoundingFPMathOption</code></li>
575<li><code>llvm::HonorSignDependentRoundingFPMath()</code></li>
576<li><code>llvm::UseSoftFloat</code></li>
577<li><code>llvm::FloatABIType</code></li>
578<li><code>llvm::NoZerosInBSS</code></li>
579<li><code>llvm::JITExceptionHandling</code></li>
580<li><code>llvm::JITEmitDebugInfo</code></li>
581<li><code>llvm::JITEmitDebugInfoToDisk</code></li>
582<li><code>llvm::GuaranteedTailCallOpt</code></li>
583<li><code>llvm::StackAlignmentOverride</code></li>
584<li><code>llvm::RealignStack</code></li>
585<li><code>llvm::DisableJumpTables</code></li>
586<li><code>llvm::EnableFastISel</code></li>
587<li><code>llvm::getTrapFunctionName()</code></li>
588<li><code>llvm::EnableSegmentedStacks</code></li>
Nick Lewycky98a92d12012-03-21 22:58:28 +0000[diff] [blame]589</ul></li>
Duncan Sandse747fad2012-04-15 18:03:49 +0000[diff] [blame]590 <li>The MDBuilder class has been added to simplify the creation of
591 metadata.</li>
Chris Lattner21e1b7a2011-12-13 17:55:30 +0000[diff] [blame]592 <li>....</li>
Daniel Dunbarf0233c62010-10-04 20:11:41 +0000[diff] [blame]593</ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]594
Daniel Dunbarf0233c62010-10-04 20:11:41 +0000[diff] [blame]595</div>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]596
Nadav Rotemfdc309c2012-02-26 08:35:53 +0000[diff] [blame]597<!--=========================================================================-->
598<h3>
599<a name="tools_changes">Tools Changes</a>
600</h3>
601
602<div>
603
604<p>In addition, some tools have changed in this release. Some of the changes
605 are:</p>
606
607
608<ul>
609 <li>llvm-stress is a command line tool for generating random .ll files to fuzz
610 different LLVM components. </li>
Michael J. Spencer75338092012-04-19 19:27:54 +0000[diff] [blame]611 <li>llvm-ld has been removed. Use llvm-link or Clang instead.</li>
Nadav Rotemfdc309c2012-02-26 08:35:53 +0000[diff] [blame]612 <li>....</li>
613</ul>
614
615<ul>
616 <li>....</li>
617</ul>
618
619</div>
620
621</div>
622
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]623<!-- *********************************************************************** -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]624<h2>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]625 <a name="knownproblems">Known Problems</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]626</h2>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]627<!-- *********************************************************************** -->
628
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]629<div>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]630
Chris Lattner70e22012011-11-27 19:38:20 +0000[diff] [blame]631<p>LLVM is generally a production quality compiler, and is used by a broad range
632 of applications and shipping in many products. That said, not every
633 subsystem is as mature as the aggregate, particularly the more obscure
634 targets. If you run into a problem, please check the <a
635 href="http://llvm.org/bugs/">LLVM bug database</a> and submit a bug if
636 there isn't already one or ask on the <a
637 href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVMdev
638 list</a>.</p>
Michael J. Spencer60f790c2011-11-28 18:20:09 +0000[diff] [blame]639
Chris Lattner70e22012011-11-27 19:38:20 +0000[diff] [blame]640 <p>Known problem areas include:</p>
Michael J. Spencer60f790c2011-11-28 18:20:09 +0000[diff] [blame]641
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]642<ul>
Chris Lattner70e22012011-11-27 19:38:20 +0000[diff] [blame]643 <li>The Alpha, Blackfin, CellSPU, MSP430, PTX, SystemZ and
Chris Lattner1c80fbf2011-11-27 20:51:47 +0000[diff] [blame]644 XCore backends are experimental, and the Alpha, Blackfin and SystemZ
645 targets have already been removed from mainline.</li>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]646
Chris Lattner70e22012011-11-27 19:38:20 +0000[diff] [blame]647 <li>The integrated assembler, disassembler, and JIT is not supported by
648 several targets. If an integrated assembler is not supported, then a
649 system assembler is required. For more details, see the <a
650 href="CodeGenerator.html#targetfeatures">Target Features Matrix</a>.
651 </li>
Michael J. Spencer60f790c2011-11-28 18:20:09 +0000[diff] [blame]652
Chris Lattner70e22012011-11-27 19:38:20 +0000[diff] [blame]653 <li>The C backend has numerous problems and is not being actively maintained.
654 Depending on it for anything serious is not advised.</li>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]655</ul>
656
657</div>
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]658
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]659<!-- *********************************************************************** -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]660<h2>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]661 <a name="additionalinfo">Additional Information</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]662</h2>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]663<!-- *********************************************************************** -->
664
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]665<div>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]666
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]667<p>A wide variety of additional information is available on
668 the <a href="http://llvm.org/">LLVM web page</a>, in particular in
669 the <a href="http://llvm.org/docs/">documentation</a> section. The web page
670 also contains versions of the API documentation which is up-to-date with the
671 Subversion version of the source code. You can access versions of these
672 documents specific to this release by going into the "<tt>llvm/doc/</tt>"
673 directory in the LLVM tree.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]674
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]675<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]676 us via the <a href="http://llvm.org/docs/#maillist"> mailing lists</a>.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]677
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]678</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]679
680<!-- *********************************************************************** -->
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]681
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]682<hr>
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]683<address>
Misha Brukman38847d52003-12-21 22:53:21 +0000[diff] [blame]684 <a href="http://jigsaw.w3.org/css-validator/check/referer"><img
Misha Brukman44408702008-12-11 17:34:48 +0000[diff] [blame]685 src="http://jigsaw.w3.org/css-validator/images/vcss-blue" alt="Valid CSS"></a>
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]686 <a href="http://validator.w3.org/check/referer"><img
Misha Brukman44408702008-12-11 17:34:48 +0000[diff] [blame]687 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]688
Chris Lattnerb4b0ce72007-05-18 00:44:29 +0000[diff] [blame]689 <a href="http://llvm.org/">LLVM Compiler Infrastructure</a><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]690 Last modified: $Date$
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]691</address>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]692
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]693</body>
694</html>