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Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]7 <title>LLVM 3.0 Release Notes</title>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]8</head>
9<body>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]10
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]11<h1>LLVM 3.0 Release Notes</h1>
Mikhail Glushenkovea65d7d2008-10-13 02:08:34 +0000[diff] [blame]12
Chris Lattner0e464a92010-03-17 04:02:39 +0000[diff] [blame]13<img align=right src="http://llvm.org/img/DragonSmall.png"
Gabor Greifee2187a2010-04-22 10:21:43 +0000[diff] [blame]14 width="136" height="136" alt="LLVM Dragon Logo">
Chris Lattner0e464a92010-03-17 04:02:39 +0000[diff] [blame]15
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]16<ol>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]17 <li><a href="#intro">Introduction</a></li>
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]18 <li><a href="#subproj">Sub-project Status Update</a></li>
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]19 <li><a href="#externalproj">External Projects Using LLVM 3.0</a></li>
20 <li><a href="#whatsnew">What's New in LLVM 3.0?</a></li>
Chris Lattner4b538b92004-04-30 22:17:12 +0000[diff] [blame]21 <li><a href="GettingStarted.html">Installation Instructions</a></li>
Dan Gohman44aa9212008-10-14 16:23:02 +0000[diff] [blame]22 <li><a href="#knownproblems">Known Problems</a></li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]23 <li><a href="#additionalinfo">Additional Information</a></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]24</ol>
25
Chris Lattner7911ce22004-05-23 21:07:27 +0000[diff] [blame]26<div class="doc_author">
NAKAMURA Takumib9a33632011-04-09 02:13:37 +0000[diff] [blame]27 <p>Written by the <a href="http://llvm.org/">LLVM Team</a></p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]28</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]29
Chris Lattner49123fd2011-04-06 06:29:50 +0000[diff] [blame]30<!--
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]31<h1 style="color:red">These are in-progress notes for the upcoming LLVM 3.0
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]32release.<br>
33You may prefer the
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]34<a href="http://llvm.org/releases/2.9/docs/ReleaseNotes.html">LLVM 2.9
Dan Gohmanb44f6c62010-05-03 23:51:05 +0000[diff] [blame]35Release Notes</a>.</h1>
Chris Lattner49123fd2011-04-06 06:29:50 +0000[diff] [blame]36 -->
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]37
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]38<!-- *********************************************************************** -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]39<h2>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]40 <a name="intro">Introduction</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]41</h2>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]42<!-- *********************************************************************** -->
43
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]44<div>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]45
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]46<p>This document contains the release notes for the LLVM Compiler
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]47 Infrastructure, release 3.0. Here we describe the status of LLVM, including
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>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]65
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]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
75<p>The LLVM 3.0 distribution currently consists of code from the core LLVM
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
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]97<p>In the LLVM 3.0 time-frame, the Clang team has made many improvements:</p>
Douglas Gregorba087df2011-10-15 00:48:01 +0000[diff] [blame]98
99<ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]100 <li>Greatly improved support for building C++ applications, with greater
101 stability and better diagnostics.</li>
Douglas Gregorba087df2011-10-15 00:48:01 +0000[diff] [blame]102
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]103 <li><a href="http://clang.llvm.org/cxx_status.html">Improved support</a> for
104 the <a href="http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=50372">C++
Chris Lattner1ab8ce92011-11-27 18:47:37 +0000[diff] [blame]105 2011</a> standard (aka "C++'0x"), including implementations of non-static data member
106 initializers, alias templates, delegating constructors, range-based
107 for loops, and implicitly-generated move constructors and move assignment
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]108 operators, among others.</li>
Douglas Gregorba087df2011-10-15 00:48:01 +0000[diff] [blame]109
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]110 <li>Implemented support for some features of the upcoming C1x standard,
111 including static assertions and generic selections.</li>
Douglas Gregorba087df2011-10-15 00:48:01 +0000[diff] [blame]112
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]113 <li>Better detection of include and linking paths for system headers and
114 libraries, especially for Linux distributions.</li>
Douglas Gregorba087df2011-10-15 00:48:01 +0000[diff] [blame]115
David Chisnall553284e2011-11-26 10:56:17 +0000[diff] [blame]116 <li>Several improvements to Objective-C support, including:
117
118 <ul>
119 <li><a href="http://clang.llvm.org/docs/AutomaticReferenceCounting.html">
120 Automatic Reference Counting</a> (ARC) and an improved memory model
121 cleanly separating object and C memory.</li>
122
Chris Lattner1ab8ce92011-11-27 18:47:37 +0000[diff] [blame]123 <li>A migration tool for moving manual retain/release code to ARC</li>
David Chisnall553284e2011-11-26 10:56:17 +0000[diff] [blame]124
125 <li>Better support for data hiding, allowing instance variables to be
126 declared in implementation contexts or class extensions</li>
Chris Lattner1ab8ce92011-11-27 18:47:37 +0000[diff] [blame]127 <li>Weak linking support for Objective-C classes</li>
David Chisnall553284e2011-11-26 10:56:17 +0000[diff] [blame]128 <li>Improved static type checking by inferring the return type of methods
129 such as +alloc and -init.</li>
130 </ul>
131
Chris Lattner1ab8ce92011-11-27 18:47:37 +0000[diff] [blame]132 Some new Objective-C features require either the Mac OS X 10.7 / iOS 5
133 Objective-C runtime, or version 1.6 or later of the GNUstep Objective-C
134 runtime version.</li>
Douglas Gregorba087df2011-10-15 00:48:01 +0000[diff] [blame]135
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]136 <li>Implemented a number of optimizations in <tt>libclang</tt>, the Clang C
137 interface, to improve the performance of code completion and the mapping
138 from source locations to abstract syntax tree nodes.</li>
Douglas Gregorba087df2011-10-15 00:48:01 +0000[diff] [blame]139</ul>
140
Chris Lattner0a6f6d52011-04-05 07:19:28 +0000[diff] [blame]141
Duncan Sandsf3ba7af2011-04-06 08:07:40 +0000[diff] [blame]142<p>If Clang rejects your code but another compiler accepts it, please take a
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]143 look at the <a href="http://clang.llvm.org/compatibility.html">language
144 compatibility</a> guide to make sure this is not intentional or a known
145 issue.</p>
Bill Wendling741748a2008-10-27 09:27:33 +0000[diff] [blame]146
Chris Lattnerfb97b2d2008-10-13 18:11:54 +0000[diff] [blame]147</div>
148
149<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]150<h3>
Duncan Sands528a5102011-04-04 11:09:08 +0000[diff] [blame]151<a name="dragonegg">DragonEgg: GCC front-ends, LLVM back-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]152</h3>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]153
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]154<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]155<p><a href="http://dragonegg.llvm.org/">DragonEgg</a> is a
156 <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]157 optimizers and code generators with LLVM's. It works with gcc-4.5 or gcc-4.6,
158 targets the x86-32 and x86-64 processor families, and has been successfully
159 used on the Darwin, FreeBSD, KFreeBSD, Linux and OpenBSD platforms. It fully
160 supports Ada, C, C++ and Fortran. It has partial support for Go, Java, Obj-C
161 and Obj-C++.</p>
Duncan Sands749fd832010-04-02 09:23:15 +0000[diff] [blame]162
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]163<p>The 3.0 release has the following notable changes:</p>
164
Chris Lattner1ab8ce92011-11-27 18:47:37 +0000[diff] [blame]165 <ul>
Duncan Sands77352c92011-11-10 18:44:29 +0000[diff] [blame]166 <li>GCC version 4.6 is now fully supported.</li>
167
168 <li>Patching and building GCC is no longer required: the plugin should work
169 with your system GCC (version 4.5 or 4.6; on Debian/Ubuntu systems the
170 gcc-4.5-plugin-dev or gcc-4.6-plugin-dev package is also needed).</li>
171
172 <li>The <tt>-fplugin-arg-dragonegg-enable-gcc-optzns</tt> option, which runs
173 GCC's optimizers as well as LLVM's, now works much better. This is the
Chris Lattner1ab8ce92011-11-27 18:47:37 +0000[diff] [blame]174 option to use if you want ultimate performance! It is still experimental
175 though: it may cause the plugin to crash.</li>
Duncan Sands77352c92011-11-10 18:44:29 +0000[diff] [blame]176
177 <li>The type and constant conversion logic has been almost entirely rewritten,
178 fixing a multitude of obscure bugs.</li>
179
Duncan Sands4b1da2b2010-09-30 17:37:34 +0000[diff] [blame]180</ul>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]181
182</div>
183
Chris Lattner75547712010-10-03 23:49:06 +0000[diff] [blame]184<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]185<h3>
Chris Lattner75547712010-10-03 23:49:06 +0000[diff] [blame]186<a name="compiler-rt">compiler-rt: Compiler Runtime Library</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]187</h3>
Chris Lattner75547712010-10-03 23:49:06 +0000[diff] [blame]188
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]189<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]190
191<p>The new LLVM <a href="http://compiler-rt.llvm.org/">compiler-rt project</a>
192 is a simple library that provides an implementation of the low-level
193 target-specific hooks required by code generation and other runtime
194 components. For example, when compiling for a 32-bit target, converting a
195 double to a 64-bit unsigned integer is compiled into a runtime call to the
196 "__fixunsdfdi" function. The compiler-rt library provides highly optimized
197 implementations of this and other low-level routines (some are 3x faster than
198 the equivalent libgcc routines).</p>
Chris Lattner75547712010-10-03 23:49:06 +0000[diff] [blame]199
Chris Lattner1ab8ce92011-11-27 18:47:37 +0000[diff] [blame]200<p>In the LLVM 3.0 timeframe, the target specific ARM code has converted to
201 "unified" assembly syntax, and several new functions have been added to the
202 library.</p>
Chris Lattner75547712010-10-03 23:49:06 +0000[diff] [blame]203
204</div>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]205
206<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]207<h3>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]208<a name="lldb">LLDB: Low Level Debugger</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]209</h3>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]210
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]211<div>
Chris Lattner9e896712011-11-27 18:53:41 +0000[diff] [blame]212
213<p>LLDB is a ground-up implementation of a command line debugger, as well as a
214 debugger API that can be used from other applications. LLDB makes use of the
215 Clang parser to provide high-fidelity expression parsing (particularly for
216 C++) and uses the LLVM JIT for target support.</p>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]217
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]218<p>LLDB has advanced by leaps and bounds in the 3.0 timeframe. It is
219 dramatically more stable and useful, and includes both a
220 new <a href="http://lldb.llvm.org/tutorial.html">tutorial</a> and
221 a <a href="http://lldb.llvm.org/lldb-gdb.html">side-by-side comparison with
222 GDB</a>.</p>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]223
224</div>
225
226<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]227<h3>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]228<a name="libc++">libc++: C++ Standard Library</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]229</h3>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]230
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]231<div>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]232
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]233<p>Like compiler_rt, libc++ is now <a href="DeveloperPolicy.html#license">dual
234 licensed</a> under the MIT and UIUC license, allowing it to be used more
235 permissively.</p>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]236
David Chisnall553284e2011-11-26 10:56:17 +0000[diff] [blame]237<p>Libc++ has been ported to FreeBSD and imported into the base system. It is
238 planned to be the default STL implementation for FreeBSD 10.</p>
239
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]240</div>
241
Chris Lattner3d6a80a2011-04-07 03:08:22 +0000[diff] [blame]242<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]243<h3>
Chris Lattner3d6a80a2011-04-07 03:08:22 +0000[diff] [blame]244<a name="vmkit">VMKit</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]245</h3>
Chris Lattner3d6a80a2011-04-07 03:08:22 +0000[diff] [blame]246
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]247<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]248
Nicolas Geoffray54d5df92011-11-10 23:37:56 +0000[diff] [blame]249 <p>The <a href="http://vmkit.llvm.org/">VMKit project</a> is an
250 implementation of a Java Virtual Machine (Java VM or JVM) that uses LLVM for
251 static and just-in-time compilation.
252
253 <p>In the LLVM 3.0 time-frame, VMKit has had significant improvements on both
254 runtime and startup performance:</p>
255
256 <ul>
257 <li>Precompilation: by compiling ahead of time a small subset of Java's core
258 library, the startup performance have been highly optimized to the point that
259 running a 'Hello World' program takes less than 30 milliseconds.</li>
260
261 <li>Customization: by customizing virtual methods for individual classes,
262 the VM can statically determine the target of a virtual call, and decide to
263 inline it.</li>
264
265 <li>Inlining: the VM does more inlining than it did before, by allowing more
266 bytecode instructions to be inlined, and thanks to customization. It also
267 inlines GC barriers, and object allocations.</li>
268
269 <li>New exception model: the generated code for a method that does not do
270 any try/catch is not penalized anymore by the eventuality of calling a
271 method that throws an exception. Instead, the method that throws the
272 exception jumps directly to the method that could catch it.</li>
273 </ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]274
Chris Lattner3d6a80a2011-04-07 03:08:22 +0000[diff] [blame]275</div>
276
Chris Lattner9e896712011-11-27 18:53:41 +0000[diff] [blame]277
278<!--=========================================================================-->
279<h3>
280<a name="LLBrowse">LLBrowse: IR Browser</a>
281</h3>
282
283<div>
284
285<p><a href="http://llvm.org/svn/llvm-project/llbrowse/trunk/doc/LLBrowse.html">
286 LLBrowse</a> is an interactive viewer for LLVM modules. It can load any LLVM
287 module and displays its contents as an expandable tree view, facilitating an
288 easy way to inspect types, functions, global variables, or metadata nodes. It
289 is fully cross-platform, being based on the popular wxWidgets GUI
290 toolkit.</p>
291
292</div>
293
294
Daniel Dunbar97b01a82010-10-04 17:39:47 +0000[diff] [blame]295<!--=========================================================================-->
Chris Lattner7a8e6c52011-04-05 18:38:45 +0000[diff] [blame]296<!--
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]297<h3>
Daniel Dunbar97b01a82010-10-04 17:39:47 +0000[diff] [blame]298<a name="klee">KLEE: A Symbolic Execution Virtual Machine</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]299</h3>
Daniel Dunbar97b01a82010-10-04 17:39:47 +0000[diff] [blame]300
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]301<div>
Daniel Dunbar97b01a82010-10-04 17:39:47 +0000[diff] [blame]302<p>
303<a href="http://klee.llvm.org/">KLEE</a> is a symbolic execution framework for
304programs in LLVM bitcode form. KLEE tries to symbolically evaluate "all" paths
305through the application and records state transitions that lead to fault
306states. This allows it to construct testcases that lead to faults and can even
307be used to verify some algorithms.
308</p>
309
Chris Lattnerbe2e1b52011-03-10 07:43:44 +0000[diff] [blame]310<p>UPDATE!</p>
Chris Lattner7a8e6c52011-04-05 18:38:45 +0000[diff] [blame]311</div>-->
Daniel Dunbar97b01a82010-10-04 17:39:47 +0000[diff] [blame]312
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]313</div>
Daniel Dunbar97b01a82010-10-04 17:39:47 +0000[diff] [blame]314
Chris Lattnerab68e9e2009-02-26 22:33:38 +0000[diff] [blame]315<!-- *********************************************************************** -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]316<h2>
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]317 <a name="externalproj">External Open Source Projects Using LLVM 3.0</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]318</h2>
Chris Lattnerab68e9e2009-02-26 22:33:38 +0000[diff] [blame]319<!-- *********************************************************************** -->
320
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]321<div>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]322
323<p>An exciting aspect of LLVM is that it is used as an enabling technology for
324 a lot of other language and tools projects. This section lists some of the
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]325 projects that have already been updated to work with LLVM 3.0.</p>
Chris Lattner75547712010-10-03 23:49:06 +0000[diff] [blame]326
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]327<!--=========================================================================-->
Bill Wendling7be6bc52011-10-26 00:17:54 +0000[diff] [blame]328<h3>AddressSanitizer</h3>
329
330<div>
331
332<p><a href="http://code.google.com/p/address-sanitizer/">AddressSanitizer</a>
333 uses compiler instrumentation and a specialized malloc library to find C/C++
334 bugs such as use-after-free and out-of-bound accesses to heap, stack, and
335 globals. The key feature of the tool is speed: the average slowdown
336 introduced by AddressSanitizer is less than 2x.</p>
337
338</div>
339
340<!--=========================================================================-->
Bill Wendling29817ea2011-10-26 00:14:36 +0000[diff] [blame]341<h3>ClamAV</h3>
342
343<div>
Bill Wendlingf2a78332011-10-25 01:01:42 +0000[diff] [blame]344
Bill Wendling29817ea2011-10-26 00:14:36 +0000[diff] [blame]345<p><a href="http://www.clamav.net">Clam AntiVirus</a> is an open source (GPL)
346 anti-virus toolkit for UNIX, designed especially for e-mail scanning on mail
347 gateways.</p>
348
349<p>Since version 0.96 it
350 has <a href="http://vrt-sourcefire.blogspot.com/2010/09/introduction-to-clamavs-low-level.html">bytecode
Chris Lattner4f0fe432011-11-27 19:26:30 +0000[diff] [blame^]351 signatures</a> that allow writing detections for complex malware.
352 It uses LLVM's JIT to speed up the execution of bytecode on X86, X86-64,
Bill Wendling29817ea2011-10-26 00:14:36 +0000[diff] [blame]353 PPC32/64, falling back to its own interpreter otherwise. The git version was
354 updated to work with LLVM 3.0.</p>
355
356</div>
357
358<!--=========================================================================-->
Tobias Grosserae5a6fd2011-11-14 09:09:26 +0000[diff] [blame]359<h3>clang_complete for VIM</h3>
360
361<div>
362
363<p><a href="https://github.com/Rip-Rip/clang_complete">clang_complete</a> is a
364 VIM plugin, that provides accurate C/C++ autocompletion using the clang front
365 end. The development version of clang complete, can directly use libclang
366 which can maintain a cache to speed up auto completion.</p>
367
368</div>
369
370<!--=========================================================================-->
Bill Wendling65d1f412011-10-26 18:23:06 +0000[diff] [blame]371<h3>clReflect</h3>
372
373<div>
374
375<p><a href="https://bitbucket.org/dwilliamson/clreflect">clReflect</a> is a C++
376 parser that uses clang/LLVM to derive a light-weight reflection database
377 suitable for use in game development. It comes with a very simple runtime
378 library for loading and querying the database, requiring no external
379 dependencies (including CRT), and an additional utility library for object
380 management and serialisation.</p>
381
382</div>
383
384<!--=========================================================================-->
Bill Wendling63507d12011-10-29 01:10:01 +0000[diff] [blame]385<h3>Cling C++ Interpreter</h3>
386
387<div>
388
389<p><a href="http://cern.ch/cling">Cling</a> is an interactive compiler interface
Chris Lattner4f0fe432011-11-27 19:26:30 +0000[diff] [blame^]390 (aka C++ interpreter). It supports C++ and C, and uses LLVM's JIT and the
391 Clang parser. It has a prompt interface, runs source files, calls into shared
Bill Wendling63507d12011-10-29 01:10:01 +0000[diff] [blame]392 libraries, prints the value of expressions, even does runtime lookup of
393 identifiers (dynamic scopes). And it just behaves like one would expect from
394 an interpreter.</p>
395
396</div>
397
398<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]399<h3>Crack Programming Language</h3>
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]400
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]401<div>
Bill Wendling55d6e672011-11-03 20:10:01 +0000[diff] [blame]402
403<p><a href="http://code.google.com/p/crack-language/">Crack</a> aims to provide
404 the ease of development of a scripting language with the performance of a
405 compiled language. The language derives concepts from C++, Java and Python,
406 incorporating object-oriented programming, operator overloading and strong
407 typing.</p>
408
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]409</div>
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]410
411<!--=========================================================================-->
Bill Wendlingb99486f2011-11-08 05:22:54 +0000[diff] [blame]412<h3>Eero</h3>
413
414<div>
415
416<p><a href="http://eerolanguage.org/">Eero</a> is a fully
417 header-and-binary-compatible dialect of Objective-C 2.0, implemented with a
418 patched version of the Clang/LLVM compiler. It features a streamlined syntax,
419 Python-like indentation, and new operators, for improved readability and
420 reduced code clutter. It also has new features such as limited forms of
421 operator overloading and namespaces, and strict (type-and-operator-safe)
422 enumerations. It is inspired by languages such as Smalltalk, Python, and
423 Ruby.</p>
424
425</div>
426
427<!--=========================================================================-->
Chris Lattneradb417a2011-11-25 20:28:16 +0000[diff] [blame]428<h3>FAUST Real-Time Audio Signal Processing Language</h3>
429
430<div>
431
432<p><a href="http://faust.grame.fr/">FAUST</a> is a compiled language for
433 real-time audio signal processing. The name FAUST stands for Functional
434 AUdio STream. Its programming model combines two approaches: functional
435 programming and block diagram composition. In addition with the C, C++, Java
436 output formats, the Faust compiler can now generate LLVM bitcode, and works
437 with LLVM 2.7-3.0.
438 </p>
439
440</div>
441
442<!--=========================================================================-->
Bill Wendlingf9778192011-10-26 00:09:55 +0000[diff] [blame]443<h3>Glasgow Haskell Compiler (GHC)</h3>
444
445<div>
446
447<p>GHC is an open source, state-of-the-art programming suite for Haskell, a
448 standard lazy functional programming language. It includes an optimizing
449 static compiler generating good code for a variety of platforms, together
450 with an interactive system for convenient, quick development.</p>
451
452<p>GHC 7.0 and onwards include an LLVM code generator, supporting LLVM 2.8 and
453 later. Since LLVM 2.9, GHC now includes experimental support for the ARM
454 platform with LLVM 3.0.</p>
455
456</div>
457
458<!--=========================================================================-->
Bill Wendlingf62333d2011-10-25 20:35:31 +0000[diff] [blame]459<h3>gwXscript</h3>
460
461<div>
462
463<p><a href="http://botwars.tk/gwscript/">gwXscript</a> is an object oriented,
Bill Wendling7c38de22011-10-26 04:24:15 +0000[diff] [blame]464 aspect oriented programming language which can create both executables (ELF,
Bill Wendlingf62333d2011-10-25 20:35:31 +0000[diff] [blame]465 EXE) and shared libraries (DLL, SO, DYNLIB). The compiler is implemented in
466 its own language and translates scripts into LLVM-IR which can be optimized
467 and translated into native code by the LLVM framework. Source code in
468 gwScript contains definitions that expand the namespaces. So you can build
469 your project and simply 'plug out' features by removing a file. The remaining
470 project does not leave scars since you directly separate concerns by the
471 'template' feature of gwX. It is also possible to add new features to a
472 project by just adding files and without editing the original project. This
473 language is used for example to create games or content management systems
474 that should be extendable.</p>
475
476<p>gwXscript is strongly typed and offers comfort with its native types string,
477 hash and array. You can easily write new libraries in gwXscript or native
478 code. gwXscript is type safe and users should not be able to crash your
479 program or execute malicious code except code that is eating CPU time.</p>
480
481</div>
482
483<!--=========================================================================-->
Bill Wendling50cacc82011-10-26 22:55:18 +0000[diff] [blame]484<h3>include-what-you-use</h3>
485
486<div>
487
488<p><a href="http://code.google.com/p/include-what-you-use">include-what-you-use</a>
489 is a tool to ensure that a file directly <code>#include</code>s
490 all <code>.h</code> files that provide a symbol that the file uses. It also
491 removes superfluous <code>#include</code>s from source files.</p>
492
493</div>
494
495<!--=========================================================================-->
Bill Wendling32dc4d92011-11-07 22:05:17 +0000[diff] [blame]496<h3>ispc: The Intel SPMD Program Compiler</h3>
497
498<div>
499
500<p><a href="http://ispc.github.com">ispc</a> is a compiler for "single program,
501 multiple data" (SPMD) programs. It compiles a C-based SPMD programming
502 language to run on the SIMD units of CPUs; it often delivers 5-6x speedups on
503 a single core of a CPU with an 8-wide SIMD unit compared to serial code,
504 while still providing a clean and easy-to-understand programming model. For
505 an introduction to the language and its performance,
Chris Lattnerc343e312011-11-10 20:15:40 +0000[diff] [blame]506 see <a href="http://ispc.github.com/example.html">the walkthrough</a> of a short
Bill Wendling32dc4d92011-11-07 22:05:17 +0000[diff] [blame]507 example program. ispc is licensed under the BSD license.</p>
508
509</div>
Chris Lattnercc089772011-11-25 20:36:17 +0000[diff] [blame]510
511<!--=========================================================================-->
512<h3>The Julia Programming Language</h3>
513
514<div>
515
516<p><a href="http://github.com/JuliaLang/julia">Julia</a> is a high-level,
517 high-performance dynamic language for technical
518 computing. It provides a sophisticated compiler, distributed parallel
519 execution, numerical accuracy, and an extensive mathematical function
520 library. The compiler uses type inference to generate fast code
521 without any type declarations, and uses LLVM's optimization passes and
522 JIT compiler. The language is designed around multiple dispatch,
523 giving programs a large degree of flexibility. It is ready for use on many
524 kinds of problems.</p>
525</div>
Bill Wendling32dc4d92011-11-07 22:05:17 +0000[diff] [blame]526
527<!--=========================================================================-->
Bill Wendling57fd8762011-10-26 18:20:54 +0000[diff] [blame]528<h3>LanguageKit and Pragmatic Smalltalk</h3>
529
530<div>
531
532<p><a href="http://etoileos.com/etoile/features/languagekit/">LanguageKit</a> is
533 a framework for implementing dynamic languages sharing an object model with
534 Objective-C. It provides static and JIT compilation using LLVM along with
535 its own interpreter. Pragmatic Smalltalk is a dialect of Smalltalk, built on
536 top of LanguageKit, that interfaces directly with Objective-C, sharing the
537 same object representation and message sending behaviour. These projects are
Benjamin Kramer7c5025b2011-11-25 21:26:00 +0000[diff] [blame]538 developed as part of the &Eacute;toil&eacute; desktop environment.</p>
Bill Wendling57fd8762011-10-26 18:20:54 +0000[diff] [blame]539
540</div>
541
542<!--=========================================================================-->
Bill Wendling03250532011-11-01 04:08:23 +0000[diff] [blame]543<h3>LuaAV</h3>
544
545<div>
546
547<p><a href="http://lua-av.mat.ucsb.edu/blog/">LuaAV</a> is a real-time
548 audiovisual scripting environment based around the Lua language and a
549 collection of libraries for sound, graphics, and other media protocols. LuaAV
550 uses LLVM and Clang to JIT compile efficient user-defined audio synthesis
551 routines specified in a declarative syntax.</p>
552
553</div>
554
555<!--=========================================================================-->
Bill Wendlingd4821b82011-10-26 00:16:17 +0000[diff] [blame]556<h3>Mono</h3>
557
558<div>
559
560<p>An open source, cross-platform implementation of C# and the CLR that is
561 binary compatible with Microsoft.NET. Has an optional, dynamically-loaded
562 LLVM code generation backend in Mini, the JIT compiler.</p>
563
Chris Lattner4f0fe432011-11-27 19:26:30 +0000[diff] [blame^]564<p>Note that we use a Git mirror of LLVM <a
565 href="https://github.com/mono/llvm">with some patches</a>.</p>
Bill Wendlingd4821b82011-10-26 00:16:17 +0000[diff] [blame]566
567</div>
568
569<!--=========================================================================-->
Tobias Grosser093cb7e2011-11-14 09:09:23 +0000[diff] [blame]570<h3>Polly</h3>
571
572<div>
573
574<p><a href="http://polly.grosser.es">Polly</a> is an advanced data-locality
575 optimizer and automatic parallelizer. It uses an advanced, mathematical
576 model to calculate detailed data dependency information which it uses to
577 optimize the loop structure of a program. Polly can speed up sequential code
578 by improving memory locality and consequently the cache use. Furthermore,
579 Polly is able to expose different kind of parallelism which it exploits by
580 introducing (basic) OpenMP and SIMD code. A mid-term goal of Polly is to
581 automatically create optimized GPU code.</p>
582
583</div>
584
585<!--=========================================================================-->
Bill Wendlingba226272011-10-25 20:37:45 +0000[diff] [blame]586<h3>Portable OpenCL (pocl)</h3>
587
588<div>
589
590<p>Portable OpenCL is an open source implementation of the OpenCL standard which
591 can be easily adapted for new targets. One of the goals of the project is
592 improving performance portability of OpenCL programs, avoiding the need for
593 target-dependent manual optimizations. A "native" target is included, which
594 allows running OpenCL kernels on the host (CPU).</p>
595
596</div>
597
598<!--=========================================================================-->
Bill Wendling0bad98c2011-10-25 20:39:06 +0000[diff] [blame]599<h3>Pure</h3>
600
601<div>
602<p><a href="http://pure-lang.googlecode.com/">Pure</a> is an
603 algebraic/functional programming language based on term rewriting. Programs
604 are collections of equations which are used to evaluate expressions in a
605 symbolic fashion. The interpreter uses LLVM as a backend to JIT-compile Pure
606 programs to fast native code. Pure offers dynamic typing, eager and lazy
607 evaluation, lexical closures, a hygienic macro system (also based on term
608 rewriting), built-in list and matrix support (including list and matrix
609 comprehensions) and an easy-to-use interface to C and other programming
610 languages (including the ability to load LLVM bitcode modules, and inline C,
611 C++, Fortran and Faust code in Pure programs if the corresponding LLVM-enabled
612 compilers are installed).</p>
613
614<p>Pure version 0.48 has been tested and is known to work with LLVM 3.0
615 (and continues to work with older LLVM releases &gt;= 2.5).</p>
616
617</div>
618
619<!--=========================================================================-->
Bill Wendling537d85b2011-10-26 00:12:04 +0000[diff] [blame]620<h3>Renderscript</h3>
621
622<div>
623
624<p><a href="http://developer.android.com/guide/topics/renderscript/index.html">Renderscript</a>
625 is Android's advanced 3D graphics rendering and compute API. It provides a
626 portable C99-based language with extensions to facilitate common use cases
627 for enhancing graphics and thread level parallelism. The Renderscript
628 compiler frontend is based on Clang/LLVM. It emits a portable bitcode format
629 for the actual compiled script code, as well as reflects a Java interface for
630 developers to control the execution of the compiled bitcode. Executable
631 machine code is then generated from this bitcode by an LLVM backend on the
632 device. Renderscript is thus able to provide a mechanism by which Android
633 developers can improve performance of their applications while retaining
634 portability.</p>
635
636</div>
637
638<!--=========================================================================-->
Bill Wendling7d5b6212011-10-25 20:40:26 +0000[diff] [blame]639<h3>SAFECode</h3>
640
641<div>
642
643<p><a href="http://safecode.cs.illinois.edu">SAFECode</a> is a memory safe C/C++
644 compiler built using LLVM. It takes standard, unannotated C/C++ code,
645 analyzes the code to ensure that memory accesses and array indexing
646 operations are safe, and instruments the code with run-time checks when
647 safety cannot be proven statically. SAFECode can be used as a debugging aid
648 (like Valgrind) to find and repair memory safety bugs. It can also be used
649 to protect code from security attacks at run-time.</p>
650
651</div>
652
653<!--=========================================================================-->
Bill Wendling02b77b72011-10-26 07:38:19 +0000[diff] [blame]654<h3>The Stupid D Compiler (SDC)</h3>
655
656<div>
657
658<p><a href="https://github.com/bhelyer/SDC">The Stupid D Compiler</a> is a
659 project seeking to write a self-hosting compiler for the D programming
660 language without using the frontend of the reference compiler (DMD).</p>
661
662</div>
663
664<!--=========================================================================-->
Bill Wendling2d7b4af2011-10-25 20:24:32 +0000[diff] [blame]665<h3>TTA-based Co-design Environment (TCE)</h3>
666
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]667<div>
Bill Wendling2d7b4af2011-10-25 20:24:32 +0000[diff] [blame]668
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]669<p>TCE is a toolset for designing application-specific processors (ASP) based on
Bill Wendling2d7b4af2011-10-25 20:24:32 +0000[diff] [blame]670 the Transport triggered architecture (TTA). The toolset provides a complete
671 co-design flow from C/C++ programs down to synthesizable VHDL and parallel
672 program binaries. Processor customization points include the register files,
673 function units, supported operations, and the interconnection network.</p>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]674
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]675<p>TCE uses Clang and LLVM for C/C++ language support, target independent
Bill Wendling2d7b4af2011-10-25 20:24:32 +0000[diff] [blame]676 optimizations and also for parts of code generation. It generates new
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]677 LLVM-based code generators "on the fly" for the designed TTA processors and
678 loads them in to the compiler backend as runtime libraries to avoid
Bill Wendling2d7b4af2011-10-25 20:24:32 +0000[diff] [blame]679 per-target recompilation of larger parts of the compiler chain.</p>
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]680
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]681</div>
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]682
683<!--=========================================================================-->
Bill Wendling628c2662011-10-25 20:27:37 +0000[diff] [blame]684<h3>Tart Programming Language</h3>
685
686<div>
687
688<p><a href="http://code.google.com/p/tart/">Tart</a> is a general-purpose,
689 strongly typed programming language designed for application
690 developers. Strongly inspired by Python and C#, Tart focuses on practical
691 solutions for the professional software developer, while avoiding the clutter
692 and boilerplate of legacy languages like Java and C++. Although Tart is still
693 in development, the current implementation supports many features expected of
694 a modern programming language, such as garbage collection, powerful
695 bidirectional type inference, a greatly simplified syntax for template
696 metaprogramming, closures and function literals, reflection, operator
697 overloading, explicit mutability and immutability, and much more. Tart is
698 flexible enough to accommodate a broad range of programming styles and
699 philosophies, while maintaining a strong commitment to simplicity, minimalism
700 and elegance in design.</p>
701
702</div>
703
704<!--=========================================================================-->
Bill Wendling644ce532011-10-26 09:25:01 +0000[diff] [blame]705<h3>ThreadSanitizer</h3>
706
707<div>
708
709<p><a href="http://code.google.com/p/data-race-test/">ThreadSanitizer</a> is a
710 data race detector for (mostly) C and C++ code, available for Linux, Mac OS
711 and Windows. On different systems, we use binary instrumentation frameworks
Bill Wendlingae8538e2011-10-29 01:11:15 +0000[diff] [blame]712 (Valgrind and Pin) as frontends that generate the program events for the race
713 detection algorithm. On Linux, there's an option of using LLVM-based
714 compile-time instrumentation.</p>
Bill Wendling644ce532011-10-26 09:25:01 +0000[diff] [blame]715
716</div>
717
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]718</div>
719
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]720<!-- *********************************************************************** -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]721<h2>
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]722 <a name="whatsnew">What's New in LLVM 3.0?</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]723</h2>
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]724<!-- *********************************************************************** -->
725
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]726<div>
Chris Lattnerf8e0b4e2008-06-08 22:59:35 +0000[diff] [blame]727
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]728<p>This release includes a huge number of bug fixes, performance tweaks and
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]729 minor improvements. Some of the major improvements and new features are
730 listed in this section.</p>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]731
Chris Lattner914ce462010-04-22 06:28:20 +0000[diff] [blame]732<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]733<h3>
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]734<a name="majorfeatures">Major New Features</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]735</h3>
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]736
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]737<div>
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]738
Chris Lattner1ab8ce92011-11-27 18:47:37 +0000[diff] [blame]739 <!-- Features that need text if they're finished for 3.1:
740 ARM EHABI
741 combiner-aa?
742 strong phi elim
743 loop dependence analysis
744 CorrelatedValuePropagation
745 lib/Transforms/IPO/MergeFunctions.cpp => consider for 3.1.
746 -->
747
Chris Lattner5a1731d2011-11-27 08:32:32 +0000[diff] [blame]748<p><b>llvm-gcc is gone</b>. LLVM's configure script doesn't depend on llvm-gcc anymore, clean layering.</p>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]749
Chris Lattnerc343e312011-11-10 20:15:40 +0000[diff] [blame]750<p>LLVM 3.0 includes several major new capabilities:</p>
751
Chris Lattnerdec23b62011-11-15 22:13:27 +0000[diff] [blame]752<!-- Near dead:
753 Analysis/RegionInfo.h + Dom Frontiers
754 SparseBitVector: used in LiveVar.
Chris Lattner5a1731d2011-11-27 08:32:32 +0000[diff] [blame]755 llvm/lib/Archive - replace with lib object?
Chris Lattnerdec23b62011-11-15 22:13:27 +0000[diff] [blame]756 -->
757
758<!--
Chris Lattner5130d4e2011-11-27 05:47:57 +0000[diff] [blame]759 Type system rewrite: http://blog.llvm.org/2011/11/llvm-30-type-system-rewrite.html
Chris Lattnerdec23b62011-11-15 22:13:27 +0000[diff] [blame]760 Better performance for Neon code in clang due to SRoA improvements.
761 New regalloc on by default. Lin scan going away in 3.1
762 PGO / builtin_expect improvements (summary needed)
763 Big EH rewrite.
764 AVX support, assembler, compiler and disassembler.
765 IndVar improvements: andy
766 PTX backend improvements: Justin
767 llvm-rtdyld & MC JIT: JimG
768 InstAliases now automatically used in the asmprinter where they are shorter.
769 Integrated assembler on by default for arm/thumb?
770 PostOrder Dominator frontiers were removed.
771 Line Profiling / gcov support
772 EH and debug information produced with CFI directives, yielding smaller executables: http://blog.mozilla.com/respindola/2011/05/12/cfi-directives/
773 X86-64 generates smaller and faster code at -O0 (fast isel improvements)
774 Better code generation for Cortex-A9
775 Many APIs take ArrayRef's now.
776 Pass manager extension API.
Chris Lattner5130d4e2011-11-27 05:47:57 +0000[diff] [blame]777 ARM inline asm constraints implemented.
778 LangRef.html#fnattrs uwtable attribute for asynch unwind tables.
779 better performance for indirect gotos.
780 llvm.prefetch now takes a 4th argument that specifies whether the prefetch happens to the icache or dcache.
781 New PackedVector, TinyPtrVector class (see Programmer's Manual)
782 New nonlazybind function attribute.
783 ARC language specific optimizer (Transforms/ObjCARC) a decent example of language-specific transformation.
Chris Lattnerfbe910e2011-11-27 06:56:53 +0000[diff] [blame]784 LLVM 3.0 removes support for reading LLVM 2.8 and earlier files. Aim to maintain compatibility all the way back to 3.0 "forever".
Chris Lattner6a007d12011-11-25 20:33:27 +0000[diff] [blame]785
Chris Lattner5130d4e2011-11-27 05:47:57 +0000[diff] [blame]786 New llvm.expect intrinsic.
787 Table generated MC expansion logic for pseudo instructions that expand to multiple MC instructions through the PseudoInstExpansion class. (JimG)
788 New llvm.fma intrinsic.
789
790 Euro dev meeting and main one too.
Chris Lattnerf51572a2011-11-27 07:37:53 +0000[diff] [blame]791 New atomics instructions, "#i_fence" instruction, cmpxchg, atomicrmw too. What target support (X86/ARM)? Also 'atomic load/store'. See Atomics.html
Chris Lattner5130d4e2011-11-27 05:47:57 +0000[diff] [blame]792 X86: inline assembler supports .code32 and .code64.
Chris Lattner8ddff912011-11-27 06:24:49 +0000[diff] [blame]793 Exception handling rewrite: new landingpad and resume instruction. Unwind gone.
794 LowerSetJmp pass removed, unused.
Chris Lattner5a1731d2011-11-27 08:32:32 +0000[diff] [blame]795 llvm-objdump / dwarf parser library / llvm-dwarfdump (d0k)
796 object file parsing stuff and llvm-size (mspencer)
797 llvm-cov (devang)
Chris Lattner8ddff912011-11-27 06:24:49 +0000[diff] [blame]798 Old arm disassembler replaced with a new one based on autogenerated encoding information from ARM .td files.
Chris Lattnerf51572a2011-11-27 07:37:53 +0000[diff] [blame]799 Frontend tests removed from llvm/test/Frontend* (was this completed for 3.0?)
800 Segmented stack support (X86 only?) Rafael and Sanjoy Das: docs/SegmentedStacks.html should be in CodeGen.html status table?
801 X86 backend support for NaCl (David Meyer / Nick L)
802 Codegen now supports vector "select" operations on vector comparisons, turning
803 them into various optimized code sequences (e.g. using the SSE4/AVX "blend"
804 instructions).
Chris Lattner5a1731d2011-11-27 08:32:32 +0000[diff] [blame]805 #line directives in integrated assembler
806 SSE domain fixing code enabled for AVX (Bruno/Jakob). Domain fixing pass is
807 now target independent (ExecutionDepsFix pass). (Jakob)
808 X86 backend synthesizes horizontal add/sub instructions from generic code.
809 returns_twice attribute (rafael)
810 Tablegen has been split into a library, clang tblgen pieces now live in clang.
811 The llvm version is now named llvm-tblgen instead of tblgen.
812 X86: Tons of encoding improvements and new instructions (e.g. Atom, Ivy Bridge,
813 and BMI instructions)
814 added to assembler and disassembler (Craig Topper)
815 data layout string can encode the natural alignment of the target's stack for better optimization (LangRef.html#datalayout)
Chris Lattnerdec23b62011-11-15 22:13:27 +0000[diff] [blame]816 -->
817
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]818<ul>
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]819
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]820<!--
821<li></li>
822-->
Chris Lattner7a8e6c52011-04-05 18:38:45 +0000[diff] [blame]823
Chris Lattner8170c102008-02-10 08:18:42 +0000[diff] [blame]824</ul>
Chris Lattner0a6f6d52011-04-05 07:19:28 +0000[diff] [blame]825
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]826</div>
827
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]828<!--=========================================================================-->
Chris Lattnerf304ffc2008-02-10 08:17:19 +0000[diff] [blame]829
Chris Lattner4f0fe432011-11-27 19:26:30 +0000[diff] [blame^]830<!-- EH details: to be moved to a blog post:
831
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]832
Chris Lattner4f0fe432011-11-27 19:26:30 +0000[diff] [blame^]833
834
Bill Wendlingbc5f6dd2011-10-26 18:33:01 +0000[diff] [blame]835<p>One of the biggest changes is that 3.0 has a new exception handling
836 system. The old system used LLVM intrinsics to convey the exception handling
837 information to the code generator. It worked in most cases, but not
838 all. Inlining was especially difficult to get right. Also, the intrinsics
839 could be moved away from the <code>invoke</code> instruction, making it hard
840 to recover that information.</p>
841
842<p>The new EH system makes exception handling a first-class member of the IR. It
843 adds two new instructions:</p>
844
Chris Lattner791f77b2008-06-05 06:25:56 +0000[diff] [blame]845<ul>
Bill Wendlingbc5f6dd2011-10-26 18:33:01 +0000[diff] [blame]846 <li><a href="LangRef.html#i_landingpad"><code>landingpad</code></a> &mdash;
847 this instruction defines a landing pad basic block. It contains all of the
848 information that's needed by the code generator. It's also required to be
849 the first non-PHI instruction in the landing pad. In addition, a landing
850 pad may be jumped to only by the unwind edge of an <code>invoke</code>
851 instruction.</li>
852
853 <li><a href="LangRef.html#i_resume"><code>resume</code></a> &mdash; this
854 instruction causes the current exception to resume traveling up the
855 stack. It replaces the <code>@llvm.eh.resume</code> intrinsic.</li>
Chris Lattnerf304ffc2008-02-10 08:17:19 +0000[diff] [blame]856</ul>
Mikhail Glushenkovea65d7d2008-10-13 02:08:34 +0000[diff] [blame]857
Bill Wendlingbc5f6dd2011-10-26 18:33:01 +0000[diff] [blame]858<p>Converting from the old EH API to the new EH API is rather simple, because a
859 lot of complexity has been removed. The two intrinsics,
860 <code>@llvm.eh.exception</code> and <code>@llvm.eh.selector</code> have been
Benjamin Kramer7c5025b2011-11-25 21:26:00 +0000[diff] [blame]861 superseded by the <code>landingpad</code> instruction. Instead of generating
Bill Wendlingbc5f6dd2011-10-26 18:33:01 +0000[diff] [blame]862 a call to <code>@llvm.eh.exception</code> and <code>@llvm.eh.selector</code>:
863
864<div class="doc_code">
865<pre>
866Function *ExcIntr = Intrinsic::getDeclaration(TheModule,
867 Intrinsic::eh_exception);
868Function *SlctrIntr = Intrinsic::getDeclaration(TheModule,
869 Intrinsic::eh_selector);
870
871// The exception pointer.
872Value *ExnPtr = Builder.CreateCall(ExcIntr, "exc_ptr");
873
874std::vector&lt;Value*&gt; Args;
875Args.push_back(ExnPtr);
876Args.push_back(Builder.CreateBitCast(Personality,
877 Type::getInt8PtrTy(Context)));
878
879<i>// Add selector clauses to Args.</i>
880
881// The selector call.
882Builder.CreateCall(SlctrIntr, Args, "exc_sel");
883</pre>
884</div>
885
886<p>You should instead generate a <code>landingpad</code> instruction, that
887 returns an exception object and selector value:</p>
888
889<div class="doc_code">
890<pre>
891LandingPadInst *LPadInst =
892 Builder.CreateLandingPad(StructType::get(Int8PtrTy, Int32Ty, NULL),
893 Personality, 0);
894
895Value *LPadExn = Builder.CreateExtractValue(LPadInst, 0);
896Builder.CreateStore(LPadExn, getExceptionSlot());
897
898Value *LPadSel = Builder.CreateExtractValue(LPadInst, 1);
899Builder.CreateStore(LPadSel, getEHSelectorSlot());
900</pre>
901</div>
902
903<p>It's now trivial to add the individual clauses to the <code>landingpad</code>
904 instruction.</p>
905
906<div class="doc_code">
907<pre>
908<i><b>// Adding a catch clause</b></i>
909Constant *TypeInfo = getTypeInfo();
910LPadInst-&gt;addClause(TypeInfo);
911
912<i><b>// Adding a C++ catch-all</b></i>
913LPadInst-&gt;addClause(Constant::getNullValue(Builder.getInt8PtrTy()));
914
915<i><b>// Adding a cleanup</b></i>
916LPadInst-&gt;setCleanup(true);
917
918<i><b>// Adding a filter clause</b></i>
919std::vector&lt;Constant*&gt; TypeInfos;
920Constant *TypeInfo = getFilterTypeInfo();
921TypeInfos.push_back(Builder.CreateBitCast(TypeInfo, Builder.getInt8PtrTy()));
922
923ArrayType *FilterTy = ArrayType::get(Int8PtrTy, TypeInfos.size());
924LPadInst-&gt;addClause(ConstantArray::get(FilterTy, TypeInfos));
925</pre>
926</div>
927
928<p>Converting from using the <code>@llvm.eh.resume</code> intrinsic to
929 the <code>resume</code> instruction is trivial. It takes the exception
930 pointer and exception selector values returned by
931 the <code>landingpad</code> instruction:</p>
932
933<div class="doc_code">
934<pre>
935Type *UnwindDataTy = StructType::get(Builder.getInt8PtrTy(),
936 Builder.getInt32Ty(), NULL);
937Value *UnwindData = UndefValue::get(UnwindDataTy);
938Value *ExcPtr = Builder.CreateLoad(getExceptionObjSlot());
939Value *ExcSel = Builder.CreateLoad(getExceptionSelSlot());
940UnwindData = Builder.CreateInsertValue(UnwindData, ExcPtr, 0, "exc_ptr");
941UnwindData = Builder.CreateInsertValue(UnwindData, ExcSel, 1, "exc_sel");
942Builder.CreateResume(UnwindData);
943</pre>
944</div>
945
Chris Lattner4f0fe432011-11-27 19:26:30 +0000[diff] [blame^]946
947
948
949 -->
950
951<!--=========================================================================-->
952<h3>
953<a name="coreimprovements">LLVM IR and Core Improvements</a>
954</h3>
955
956<div>
957
958<p>LLVM IR has several new features for better support of new targets and that
959 expose new optimization opportunities:</p>
960
961
962
Chris Lattnerf304ffc2008-02-10 08:17:19 +0000[diff] [blame]963</div>
964
965<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]966<h3>
Andrew Trick5aab6382011-11-06 17:59:24 +0000[diff] [blame]967<a name="loopoptimization">Loop Optimization Improvements</a>
968</h3>
969
970<div>
971<p>The induction variable simplification pass in 3.0 only modifies
972 induction variables when profitable. Sign and zero extension
973 elimination, linear function test replacement, loop unrolling, and
974 other simplifications that require induction variable analysis have
975 been generalized so they no longer require loops to be rewritten in a
976 typically suboptimal form prior to optimization. This new design
977 preserves more IR level information, avoids undoing earlier loop
978 optimizations (particularly hand-optimized loops), and no longer
979 strongly depends on the code generator rewriting loops a second time
980 in a now optimal form--an intractable problem.</p>
981
982<p>The original behavior can be restored with -mllvm -enable-iv-rewrite;
983 however, support for this mode will be short lived. As such, bug
984 reports should be filed for any significant performance regressions
985 when moving from -mllvm -enable-iv-rewrite to the 3.0 default mode.</p>
986</div>
987
988<!--=========================================================================-->
989<h3>
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]990<a name="optimizer">Optimizer Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]991</h3>
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]992
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]993<div>
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]994
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]995<p>In addition to a large array of minor performance tweaks and bug fixes, this
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]996 release includes a few major enhancements and additions to the
997 optimizers:</p>
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]998
999<ul>
Benjamin Kramer933a78c2011-11-26 11:14:54 +0000[diff] [blame]1000<li>Information about <a href="BranchWeightMetadata.html">branch probability</a>
1001 and basic block frequency is now available within LLVM, based on a
1002 combination of static branch prediction heuristics and
1003 <code>__builtin_expect</code> calls. That information is currently used for
1004 register spill placement and if-conversion, with additional optimizations
1005 planned for future releases. The same framework is intended for eventual
1006 use with profile-guided optimization.</li>
Chris Lattnerc5ac61d2011-04-06 05:50:04 +0000[diff] [blame]1007</li>
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]1008
Chris Lattner11b66112010-10-04 02:42:39 +0000[diff] [blame]1009</ul>
1010
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]1011</div>
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]1012
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]1013<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1014<h3>
Chris Lattner4ba2b652010-09-30 16:31:33 +0000[diff] [blame]1015<a name="mc">MC Level Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1016</h3>
Chris Lattner4ba2b652010-09-30 16:31:33 +0000[diff] [blame]1017
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1018<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1019
1020<p>The LLVM Machine Code (aka MC) subsystem was created to solve a number of
1021 problems in the realm of assembly, disassembly, object file format handling,
1022 and a number of other related areas that CPU instruction-set level tools work
1023 in.</p>
Chris Lattner7d9b6b42010-10-02 21:59:30 +0000[diff] [blame]1024
Chris Lattner7d9b6b42010-10-02 21:59:30 +0000[diff] [blame]1025<ul>
Jim Grosbach2552de02011-11-24 00:49:21 +0000[diff] [blame]1026 <li>The ELF object streamers are much more full featured.</li>
1027 <li>Target dependent relocation handling has been refactored into the Targets.</li>
1028 <li>Early stage MC-JIT infrastructure has been implemented.</li>
Chris Lattner7d9b6b42010-10-02 21:59:30 +0000[diff] [blame]1029</ul>
1030
Jim Grosbach2552de02011-11-24 00:49:21 +0000[diff] [blame]1031<p>The MC-JIT is a major new feature for MC, and will eventually grow to replace
1032the current JIT implementation. It emits object files direct to memory and
1033uses a runtime dynamic linker to resolve references and drive lazy compilation.
1034The MC-JIT enables much greater code reuse between the JIT and the static
1035compiler and provides better integration with the platform ABI as a result.</p>
1036
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1037<p>For more information, please see
1038 the <a href="http://blog.llvm.org/2010/04/intro-to-llvm-mc-project.html">Intro
1039 to the LLVM MC Project Blog Post</a>.</p>
Chris Lattner4ba2b652010-09-30 16:31:33 +0000[diff] [blame]1040
NAKAMURA Takumi45c435a2011-04-05 08:24:22 +0000[diff] [blame]1041</div>
Chris Lattner4ba2b652010-09-30 16:31:33 +0000[diff] [blame]1042
Chris Lattner4ba2b652010-09-30 16:31:33 +0000[diff] [blame]1043<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1044<h3>
Chris Lattner511433e2009-03-02 03:24:11 +0000[diff] [blame]1045<a name="codegen">Target Independent Code Generator Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1046</h3>
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]1047
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1048<div>
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]1049
Mikhail Glushenkovf795ef02009-03-01 18:09:47 +0000[diff] [blame]1050<p>We have put a significant amount of work into the code generator
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1051 infrastructure, which allows us to implement more aggressive algorithms and
1052 make it run faster:</p>
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]1053
1054<ul>
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]1055<!--
1056<li></li>
1057-->
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]1058</ul>
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]1059</div>
1060
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]1061<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1062<h3>
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]1063<a name="x86">X86-32 and X86-64 Target Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1064</h3>
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]1065
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1066<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1067
1068<p>New features and major changes in the X86 target include:</p>
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]1069
1070<ul>
Benjamin Kramer933a78c2011-11-26 11:14:54 +0000[diff] [blame]1071 <li>The X86 backend, assembler and disassembler now completely support AVX.
1072 To enable it pass <code>-mavx</code> to the compiler.</li>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1073
Chris Lattner62f009a2011-11-15 22:48:24 +0000[diff] [blame]1074 <li>The X86 backend now supports
1075 all <a href="http://llvm.org/PR879">inline assembly that uses the X86
1076 floating point stack</a>.</li>
1077
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1078 <li>The CRC32 intrinsics have been renamed. The intrinsics were previously
1079 <code>@llvm.x86.sse42.crc32.[8|16|32]</code>
1080 and <code>@llvm.x86.sse42.crc64.[8|64]</code>. They have been renamed to
1081 <code>@llvm.x86.sse42.crc32.32.[8|16|32]</code> and
1082 <code>@llvm.x86.sse42.crc32.64.[8|64]</code>.</li>
Chad Rosierf94c9c12011-05-27 20:13:10 +0000[diff] [blame]1083
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]1084</ul>
1085
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]1086</div>
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]1087
1088<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1089<h3>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]1090<a name="ARM">ARM Target Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1091</h3>
Chris Lattnerc441fb82009-03-01 02:30:21 +0000[diff] [blame]1092
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1093<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1094
1095<p>New features of the ARM target include:</p>
Chris Lattnerc441fb82009-03-01 02:30:21 +0000[diff] [blame]1096
1097<ul>
Jim Grosbach2552de02011-11-24 00:49:21 +0000[diff] [blame]1098 <li>Reworked Set Jump Long Jump EH Lowering,</li>
1099 <li>improved support for Cortex-M series processors, and</li>
1100 <li>beta quality integrated assembler support.</li>
Bob Wilsone8472772010-09-13 17:39:35 +0000[diff] [blame]1101</ul>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]1102</div>
Chris Lattner7b95c382011-11-15 22:23:46 +0000[diff] [blame]1103
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]1104
1105<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1106<h3>
Akira Hatanaka5381cbf2011-11-15 21:33:05 +0000[diff] [blame]1107<a name="MIPS">MIPS Target Improvements</a>
1108</h3>
1109
1110<div>
1111
1112<p>New features and major changes in the MIPS target include:</p>
1113
1114<ul>
1115 <li>Most MIPS32r1 and r2 instructions are now supported.</li>
1116 <li>LE/BE MIPS32r1/r2 has been tested extensively.</li>
1117 <li>O32 ABI has been fully tested.</li>
1118 <li>MIPS backend has migrated to using the MC infrastructure for assembly printing. Initial support for direct object code emission has been implemented too.</li>
1119 <li>Delay slot filler has been updated. Now it tries to fill delay slots with useful instructions instead of always filling them with NOPs.</li>
1120 <li>Support for old-style JIT is complete.</li>
1121 <li>Support for old architectures (MIPS1 and MIPS2) has been removed.</li>
1122 <li>Initial support for MIPS64 has been added.</li>
1123</ul>
1124</div>
Chris Lattner7b95c382011-11-15 22:23:46 +0000[diff] [blame]1125
1126<!--=========================================================================-->
1127<h3>
1128 <a name="PTX">PTX Target Improvements</a>
1129</h3>
1130
1131<div>
Akira Hatanaka5381cbf2011-11-15 21:33:05 +0000[diff] [blame]1132
Chris Lattner7b95c382011-11-15 22:23:46 +0000[diff] [blame]1133 <p>
1134 The PTX back-end is still experimental, but is fairly usable for compute kernels
1135 in LLVM 3.0. Most scalar arithmetic is implemented, as well as intrinsics to
1136 access the special PTX registers and sync instructions. The major missing
1137 pieces are texture/sampler support and some vector operations.</p>
1138
1139 <p>That said, the backend is already being used for domain-specific languages
1140 and works well with the <a href="http://www.pcc.me.uk/~peter/libclc/">libclc
1141 library</a> to supply OpenCL built-ins. With it, you can use Clang to compile
1142 OpenCL code into PTX and execute it by loading the resulting PTX as a binary
1143 blob using the nVidia OpenCL library. It has been tested with several OpenCL
1144 programs, including some from the nVidia GPU Computing SDK, and the performance
1145 is on par with the nVidia compiler.</p>
1146
1147</div>
1148
Akira Hatanaka5381cbf2011-11-15 21:33:05 +0000[diff] [blame]1149<!--=========================================================================-->
1150<h3>
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]1151<a name="OtherTS">Other Target Specific Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1152</h3>
Chris Lattnerc441fb82009-03-01 02:30:21 +0000[diff] [blame]1153
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1154<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1155
Chris Lattnerc343e312011-11-10 20:15:40 +0000[diff] [blame]1156 <p>PPC32/ELF va_arg was implemented.</p>
1157 <p>PPC32 initial support for .o file writing was implemented.</p>
Wesley Peck3ff16db2011-11-14 18:56:41 +0000[diff] [blame]1158 <p>MicroBlaze scheduling itineraries were added that model the
1159 3-stage and the 5-stage pipeline architectures. The 3-stage
1160 pipeline model can be selected with <code>-mcpu=mblaze3</code>
1161 and the 5-stage pipeline model can be selected with
1162 <code>-mcpu=mblaze5</code>.</p>
Chris Lattnerc343e312011-11-10 20:15:40 +0000[diff] [blame]1163
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]1164<ul>
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]1165<!--
1166<li></li>
1167-->
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]1168</ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1169
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]1170</div>
Chris Lattner77d29b12008-06-05 08:02:49 +0000[diff] [blame]1171
1172<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1173<h3>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]1174<a name="changes">Major Changes and Removed Features</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1175</h3>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]1176
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1177<div>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]1178
Bill Wendling2626dba2011-08-03 22:18:20 +0000[diff] [blame]1179<p>If you're already an LLVM user or developer with out-of-tree changes based on
1180 LLVM 2.9, this section lists some "gotchas" that you may run into upgrading
1181 from the previous release.</p>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]1182
1183<ul>
Chris Lattner5a1731d2011-11-27 08:32:32 +0000[diff] [blame]1184 <li>The <code>LLVMC</code> meta compiler driver was removed.</li>
Jay Foadf42e9b22011-08-04 10:43:43 +0000[diff] [blame]1185 <li>The <code>LowerSetJmp</code> pass wasn't used effectively by any
1186 target and has been removed.</li>
Rafael Espindolaf940a1a2011-08-30 23:03:45 +0000[diff] [blame]1187 <li>The old <code>TailDup</code> pass was not used in the standard pipeline
1188 and was unable to update ssa form, so it has been removed.
Eli Friedmanf03bb262011-08-12 22:50:01 +0000[diff] [blame]1189 <li>The syntax of volatile loads and stores in IR has been changed to
1190 "<code>load volatile</code>"/"<code>store volatile</code>". The old
1191 syntax ("<code>volatile load</code>"/"<code>volatile store</code>")
1192 is still accepted, but is now considered deprecated.</li>
Benjamin Kramer7c5025b2011-11-25 21:26:00 +0000[diff] [blame]1193 <li>The old atomic intrinsics (<code>llvm.memory.barrier</code> and
Eli Friedman526e1bb2011-10-26 00:55:23 +0000[diff] [blame]1194 <code>llvm.atomic.*</code>) are now gone. Please use the new atomic
1195 instructions, described in the <a href="Atomics.html">atomics guide</a>.
Devang Patelb34dd132008-10-14 20:03:43 +0000[diff] [blame]1196</ul>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]1197
NAKAMURA Takumi2026de22011-08-22 23:22:05 +0000[diff] [blame]1198<h4>Windows (32-bit)</h4>
1199<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1200
NAKAMURA Takumi2026de22011-08-22 23:22:05 +0000[diff] [blame]1201<ul>
1202 <li>On Win32(MinGW32 and MSVC), Windows 2000 will not be supported.
1203 Windows XP or higher is required.</li>
1204</ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1205
NAKAMURA Takumi2026de22011-08-22 23:22:05 +0000[diff] [blame]1206</div>
1207
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]1208</div>
1209
Daniel Dunbarf0233c62010-10-04 20:11:41 +0000[diff] [blame]1210<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1211<h3>
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]1212<a name="api_changes">Internal API Changes</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1213</h3>
Daniel Dunbarf0233c62010-10-04 20:11:41 +0000[diff] [blame]1214
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1215<div>
Daniel Dunbarf0233c62010-10-04 20:11:41 +0000[diff] [blame]1216
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]1217<p>In addition, many APIs have changed in this release. Some of the major
Bill Wendling16005252011-08-02 06:20:17 +0000[diff] [blame]1218 LLVM API changes are:</p>
Daniel Dunbarf0233c62010-10-04 20:11:41 +0000[diff] [blame]1219
1220<ul>
Benjamin Kramer7c5025b2011-11-25 21:26:00 +0000[diff] [blame]1221 <li>The biggest and most pervasive change is that llvm::Types are no longer
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1222 returned or accepted as 'const' values. Instead, just pass around
Benjamin Kramer7c5025b2011-11-25 21:26:00 +0000[diff] [blame]1223 non-const Types.</li>
Chris Lattnerd1324302011-07-18 04:56:02 +0000[diff] [blame]1224
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1225 <li><code>PHINode::reserveOperandSpace</code> has been removed. Instead, you
1226 must specify how many operands to reserve space for when you create the
1227 PHINode, by passing an extra argument
1228 into <code>PHINode::Create</code>.</li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]1229
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1230 <li>PHINodes no longer store their incoming BasicBlocks as operands. Instead,
1231 the list of incoming BasicBlocks is stored separately, and can be accessed
1232 with new functions <code>PHINode::block_begin</code>
1233 and <code>PHINode::block_end</code>.</li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]1234
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1235 <li>Various functions now take an <code>ArrayRef</code> instead of either a
1236 pair of pointers (or iterators) to the beginning and end of a range, or a
1237 pointer and a length. Others now return an <code>ArrayRef</code> instead
1238 of a reference to a <code>SmallVector</code>
1239 or <code>std::vector</code>. These include:
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]1240<ul>
1241<!-- Please keep this list sorted. -->
Jay Foada3efbb12011-07-15 08:37:34 +0000[diff] [blame]1242<li><code>CallInst::Create</code></li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]1243<li><code>ComputeLinearIndex</code> (in <code>llvm/CodeGen/Analysis.h</code>)</li>
1244<li><code>ConstantArray::get</code></li>
1245<li><code>ConstantExpr::getExtractElement</code></li>
Jay Foaddab3d292011-07-21 14:31:17 +0000[diff] [blame]1246<li><code>ConstantExpr::getGetElementPtr</code></li>
1247<li><code>ConstantExpr::getInBoundsGetElementPtr</code></li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]1248<li><code>ConstantExpr::getIndices</code></li>
1249<li><code>ConstantExpr::getInsertElement</code></li>
1250<li><code>ConstantExpr::getWithOperands</code></li>
Jay Foad1d2f5692011-07-19 13:32:40 +0000[diff] [blame]1251<li><code>ConstantFoldCall</code> (in <code>llvm/Analysis/ConstantFolding.h</code>)</li>
1252<li><code>ConstantFoldInstOperands</code> (in <code>llvm/Analysis/ConstantFolding.h</code>)</li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]1253<li><code>ConstantVector::get</code></li>
1254<li><code>DIBuilder::createComplexVariable</code></li>
1255<li><code>DIBuilder::getOrCreateArray</code></li>
1256<li><code>ExtractValueInst::Create</code></li>
1257<li><code>ExtractValueInst::getIndexedType</code></li>
1258<li><code>ExtractValueInst::getIndices</code></li>
1259<li><code>FindInsertedValue</code> (in <code>llvm/Analysis/ValueTracking.h</code>)</li>
Jay Foadca12a212011-07-19 14:42:50 +0000[diff] [blame]1260<li><code>gep_type_begin</code> (in <code>llvm/Support/GetElementPtrTypeIterator.h</code>)</li>
1261<li><code>gep_type_end</code> (in <code>llvm/Support/GetElementPtrTypeIterator.h</code>)</li>
Jay Foada9203102011-07-25 09:48:08 +0000[diff] [blame]1262<li><code>GetElementPtrInst::Create</code></li>
1263<li><code>GetElementPtrInst::CreateInBounds</code></li>
1264<li><code>GetElementPtrInst::getIndexedType</code></li>
Jay Foadb60e8512011-07-21 14:42:51 +0000[diff] [blame]1265<li><code>InsertValueInst::Create</code></li>
1266<li><code>InsertValueInst::getIndices</code></li>
1267<li><code>InvokeInst::Create</code></li>
Jay Foada3efbb12011-07-15 08:37:34 +0000[diff] [blame]1268<li><code>IRBuilder::CreateCall</code></li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]1269<li><code>IRBuilder::CreateExtractValue</code></li>
Jay Foad0a2a60a2011-07-22 08:16:57 +0000[diff] [blame]1270<li><code>IRBuilder::CreateGEP</code></li>
1271<li><code>IRBuilder::CreateInBoundsGEP</code></li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]1272<li><code>IRBuilder::CreateInsertValue</code></li>
Jay Foada3efbb12011-07-15 08:37:34 +0000[diff] [blame]1273<li><code>IRBuilder::CreateInvoke</code></li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]1274<li><code>MDNode::get</code></li>
1275<li><code>MDNode::getIfExists</code></li>
1276<li><code>MDNode::getTemporary</code></li>
1277<li><code>MDNode::getWhenValsUnresolved</code></li>
Jay Foadb9b54eb2011-07-19 15:07:52 +0000[diff] [blame]1278<li><code>SimplifyGEPInst</code> (in <code>llvm/Analysis/InstructionSimplify.h</code>)</li>
Jay Foad8fbbb392011-07-19 14:01:37 +0000[diff] [blame]1279<li><code>TargetData::getIndexedOffset</code></li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]1280</ul></li>
1281
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1282 <li>All forms of <code>StringMap::getOrCreateValue</code> have been remove
1283 except for the one which takes a <code>StringRef</code>.</li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]1284
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1285 <li>The <code>LLVMBuildUnwind</code> function from the C API was removed. The
1286 LLVM <code>unwind</code> instruction has been deprecated for a long time
1287 and isn't used by the current front-ends. So this was removed during the
1288 exception handling rewrite.</li>
Bill Wendling16005252011-08-02 06:20:17 +0000[diff] [blame]1289
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1290 <li>The <code>LLVMAddLowerSetJmpPass</code> function from the C API was
1291 removed because the <code>LowerSetJmp</code> pass was removed.</li>
Bill Wendling2626dba2011-08-03 22:18:20 +0000[diff] [blame]1292
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1293 <li>The <code>DIBuilder</code> interface used by front ends to encode
1294 debugging information in the LLVM IR now expects clients to
1295 use <code>DIBuilder::finalize()</code> at the end of translation unit to
1296 complete debugging information encoding.</li>
Devang Patel6326a422011-08-15 23:00:00 +0000[diff] [blame]1297
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1298 <li>The way the type system works has been
1299 rewritten: <code>PATypeHolder</code> and <code>OpaqueType</code> are gone,
1300 and all APIs deal with <code>Type*</code> instead of <code>const
1301 Type*</code>. If you need to create recursive structures, then create a
1302 named structure, and use <code>setBody()</code> when all its elements are
1303 built. Type merging and refining is gone too: named structures are not
1304 merged with other structures, even if their layout is identical. (of
1305 course anonymous structures are still uniqued by layout).</li>
Torok Edwinf16e2d42011-09-30 13:07:52 +0000[diff] [blame]1306
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1307 <li>TargetSelect.h moved to Support/ from Target/</li>
Torok Edwinf16e2d42011-09-30 13:07:52 +0000[diff] [blame]1308
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1309 <li>UpgradeIntrinsicCall no longer upgrades pre-2.9 intrinsic calls (for
1310 example <code>llvm.memset.i32</code>).</li>
Torok Edwinf16e2d42011-09-30 13:07:52 +0000[diff] [blame]1311
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1312 <li>It is mandatory to initialize all out-of-tree passes too and their dependencies now with
1313 <code>INITIALIZE_PASS{BEGIN,END,}</code>
1314 and <code>INITIALIZE_{PASS,AG}_DEPENDENCY</code>.</li>
Torok Edwinf16e2d42011-09-30 13:07:52 +0000[diff] [blame]1315
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1316 <li>The interface for MemDepResult in MemoryDependenceAnalysis has been
1317 enhanced with new return types Unknown and NonFuncLocal, in addition to
1318 the existing types Clobber, Def, and NonLocal.</li>
Daniel Dunbarf0233c62010-10-04 20:11:41 +0000[diff] [blame]1319</ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1320
Daniel Dunbarf0233c62010-10-04 20:11:41 +0000[diff] [blame]1321</div>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]1322
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1323</div>
1324
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1325<!-- *********************************************************************** -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1326<h2>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1327 <a name="knownproblems">Known Problems</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1328</h2>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1329<!-- *********************************************************************** -->
1330
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1331<div>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1332
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1333<p>This section contains significant known problems with the LLVM system, listed
1334 by component. If you run into a problem, please check
1335 the <a href="http://llvm.org/bugs/">LLVM bug database</a> and submit a bug if
1336 there isn't already one.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1337
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]1338<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1339<h3>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]1340 <a name="experimental">Experimental features included with this release</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1341</h3>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1342
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1343<div>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]1344
Misha Brukman6df9e2c2004-05-12 21:46:05 +0000[diff] [blame]1345<p>The following components of this LLVM release are either untested, known to
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1346 be broken or unreliable, or are in early development. These components
1347 should not be relied on, and bugs should not be filed against them, but they
1348 may be useful to some people. In particular, if you would like to work on
1349 one of these components, please contact us on
1350 the <a href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVMdev
1351 list</a>.</p>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]1352
1353<ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1354 <li>The Alpha, Blackfin, CellSPU, MicroBlaze, MSP430, MIPS, PTX, SystemZ and
1355 XCore backends are experimental.</li>
1356
1357 <li><tt>llc</tt> "<tt>-filetype=obj</tt>" is experimental on all targets other
1358 than darwin and ELF X86 systems.</li>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]1359</ul>
1360
1361</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1362
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1363<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1364<h3>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1365 <a name="x86-be">Known problems with the X86 back-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1366</h3>
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]1367
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1368<div>
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]1369
1370<ul>
Chris Lattnerc78daaf2011-11-17 01:42:23 +0000[diff] [blame]1371 <li>The X86-64 backend <a href="http://llvm.org/PR1740">does not yet support
1372 the <tt>va_arg</tt> LLVM IR instruction</a>. Currently, front-ends support
1373 variadic argument constructs on X86-64 by lowering them manually.</li>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1374</ul>
1375
1376</div>
1377
1378<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1379<h3>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1380 <a name="ppc-be">Known problems with the PowerPC back-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1381</h3>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1382
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1383<div>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1384
1385<ul>
Roman Divacky223764c2011-10-30 07:49:04 +0000[diff] [blame]1386 <li>The PPC32/ELF support lacks PIC support.</li>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1387</ul>
1388
1389</div>
1390
1391<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1392<h3>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]1393 <a name="arm-be">Known problems with the ARM back-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1394</h3>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]1395
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1396<div>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]1397
1398<ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1399 <li>Thumb mode works only on ARMv6 or higher processors. On sub-ARMv6
1400 processors, thumb programs can crash or produce wrong results
1401 (<a href="http://llvm.org/PR1388">PR1388</a>).</li>
1402
1403 <li>Compilation for ARM Linux OABI (old ABI) is supported but not fully
1404 tested.</li>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]1405</ul>
1406
1407</div>
1408
1409<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1410<h3>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1411 <a name="sparc-be">Known problems with the SPARC back-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1412</h3>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1413
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1414<div>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1415
1416<ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1417 <li>The SPARC backend only supports the 32-bit SPARC ABI (-m32); it does not
1418 support the 64-bit SPARC ABI (-m64).</li>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1419</ul>
1420
1421</div>
1422
1423<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1424<h3>
Bruno Cardoso Lopesb7e1a4f2008-10-25 14:56:26 +0000[diff] [blame]1425 <a name="mips-be">Known problems with the MIPS back-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1426</h3>
Bruno Cardoso Lopesb7e1a4f2008-10-25 14:56:26 +0000[diff] [blame]1427
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1428<div>
Bruno Cardoso Lopesb7e1a4f2008-10-25 14:56:26 +0000[diff] [blame]1429
1430<ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1431 <li>64-bit MIPS targets are not supported yet.</li>
Bruno Cardoso Lopesb7e1a4f2008-10-25 14:56:26 +0000[diff] [blame]1432</ul>
1433
1434</div>
1435
1436<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1437<h3>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1438 <a name="alpha-be">Known problems with the Alpha back-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1439</h3>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1440
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1441<div>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1442
1443<ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1444 <li>On 21164s, some rare FP arithmetic sequences which may trap do not have
1445 the appropriate nops inserted to ensure restartability.</li>
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]1446</ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1447
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]1448</div>
1449
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1450<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1451<h3>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]1452 <a name="c-be">Known problems with the C back-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1453</h3>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1454
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1455<div>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1456
Chris Lattner3016ee92010-09-29 05:34:42 +0000[diff] [blame]1457<p>The C backend has numerous problems and is not being actively maintained.
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1458 Depending on it for anything serious is not advised.</p>
Chris Lattner3016ee92010-09-29 05:34:42 +0000[diff] [blame]1459
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1460<ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1461 <li><a href="http://llvm.org/PR802">The C backend has only basic support for
1462 inline assembly code</a>.</li>
1463
1464 <li><a href="http://llvm.org/PR1658">The C backend violates the ABI of common
1465 C++ programs</a>, preventing intermixing between C++ compiled by the CBE
1466 and C++ code compiled with <tt>llc</tt> or native compilers.</li>
1467
1468 <li>The C backend does not support all exception handling constructs.</li>
1469
1470 <li>The C backend does not support arbitrary precision integers.</li>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1471</ul>
1472
1473</div>
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]1474
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1475</div>
1476
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1477<!-- *********************************************************************** -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1478<h2>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1479 <a name="additionalinfo">Additional Information</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1480</h2>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1481<!-- *********************************************************************** -->
1482
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1483<div>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1484
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1485<p>A wide variety of additional information is available on
1486 the <a href="http://llvm.org/">LLVM web page</a>, in particular in
1487 the <a href="http://llvm.org/docs/">documentation</a> section. The web page
1488 also contains versions of the API documentation which is up-to-date with the
1489 Subversion version of the source code. You can access versions of these
1490 documents specific to this release by going into the "<tt>llvm/doc/</tt>"
1491 directory in the LLVM tree.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1492
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1493<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]1494 us via the <a href="http://llvm.org/docs/#maillist"> mailing lists</a>.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1495
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1496</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1497
1498<!-- *********************************************************************** -->
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1499
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1500<hr>
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]1501<address>
Misha Brukman38847d52003-12-21 22:53:21 +0000[diff] [blame]1502 <a href="http://jigsaw.w3.org/css-validator/check/referer"><img
Misha Brukman44408702008-12-11 17:34:48 +0000[diff] [blame]1503 src="http://jigsaw.w3.org/css-validator/images/vcss-blue" alt="Valid CSS"></a>
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]1504 <a href="http://validator.w3.org/check/referer"><img
Misha Brukman44408702008-12-11 17:34:48 +0000[diff] [blame]1505 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]1506
Chris Lattnerb4b0ce72007-05-18 00:44:29 +0000[diff] [blame]1507 <a href="http://llvm.org/">LLVM Compiler Infrastructure</a><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1508 Last modified: $Date$
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]1509</address>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1510
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1511</body>
1512</html>