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gerrit-public.fairphone.software / toolchain / llvm-project / 79ee88a511462dc09c43f11ce5d9eafec844242a / . / llvm / docs / ReleaseNotes.html
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Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]6 <link rel="stylesheet" href="llvm.css" type="text/css">
Chad Rosier06da55e2011-05-27 22:50:46 +0000[diff] [blame]7 <title>LLVM 3.0 Release Notes</title>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]8</head>
9<body>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]10
Chad Rosier06da55e2011-05-27 22:50:46 +0000[diff] [blame]11<h1>LLVM 3.0 Release Notes</h1>
Mikhail Glushenkov024f7cf2008-10-13 02:08:34 +0000[diff] [blame]12
Chris Lattnerc871bac2010-03-17 04:02:39 +0000[diff] [blame]13<img align=right src="http://llvm.org/img/DragonSmall.png"
Gabor Greif27b166352010-04-22 10:21:43 +0000[diff] [blame]14 width="136" height="136" alt="LLVM Dragon Logo">
Chris Lattnerc871bac2010-03-17 04:02:39 +0000[diff] [blame]15
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]16<ol>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]17 <li><a href="#intro">Introduction</a></li>
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]18 <li><a href="#subproj">Sub-project Status Update</a></li>
Chad Rosier06da55e2011-05-27 22:50:46 +0000[diff] [blame]19 <li><a href="#externalproj">External Projects Using LLVM 3.0</a></li>
20 <li><a href="#whatsnew">What's New in LLVM 3.0?</a></li>
Chris Lattner77a51732004-04-30 22:17:12 +0000[diff] [blame]21 <li><a href="GettingStarted.html">Installation Instructions</a></li>
Dan Gohmanad888912008-10-14 16:23:02 +0000[diff] [blame]22 <li><a href="#knownproblems">Known Problems</a></li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]23 <li><a href="#additionalinfo">Additional Information</a></li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]24</ol>
25
Chris Lattner020e1fc2004-05-23 21:07:27 +0000[diff] [blame]26<div class="doc_author">
NAKAMURA Takumica46f5a2011-04-09 02:13:37 +0000[diff] [blame]27 <p>Written by the <a href="http://llvm.org/">LLVM Team</a></p>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]28</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]29
Chris Lattner17c170a2011-04-06 06:29:50 +0000[diff] [blame]30<!--
Chad Rosier06da55e2011-05-27 22:50:46 +0000[diff] [blame]31<h1 style="color:red">These are in-progress notes for the upcoming LLVM 3.0
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]32release.<br>
33You may prefer the
Chad Rosier06da55e2011-05-27 22:50:46 +0000[diff] [blame]34<a href="http://llvm.org/releases/2.9/docs/ReleaseNotes.html">LLVM 2.9
Dan Gohman62af9d22010-05-03 23:51:05 +0000[diff] [blame]35Release Notes</a>.</h1>
Chris Lattner17c170a2011-04-06 06:29:50 +0000[diff] [blame]36 -->
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]37
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]38<!-- *********************************************************************** -->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]39<h2>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]40 <a name="intro">Introduction</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]41</h2>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]42<!-- *********************************************************************** -->
43
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]44<div>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]45
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]46<p>This document contains the release notes for the LLVM Compiler
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]47 Infrastructure, release 3.0. Here we describe the status of LLVM, including
Chris Lattner25a77902011-11-27 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 Wendling16133782011-10-26 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 Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]52
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]53<p>For more information about LLVM, including information about the latest
Bill Wendling16133782011-10-26 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 Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]58
Bill Wendling16133782011-10-26 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 Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]63
64</div>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]65
Chris Lattner342f9572010-09-29 05:30:03 +0000[diff] [blame]66
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]67<!-- *********************************************************************** -->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]68<h2>
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]69 <a name="subproj">Sub-project Status Update</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]70</h2>
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]71<!-- *********************************************************************** -->
Chris Lattner625a3d82008-06-08 21:34:41 +0000[diff] [blame]72
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]73<div>
Bill Wendling16133782011-10-26 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 Lattner6d3eeec2011-11-10 20:15:40 +0000[diff] [blame]77 supporting tools), and the Clang repository. In
Bill Wendling16133782011-10-26 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 Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]80
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]81<!--=========================================================================-->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]82<h3>
Chris Lattner44c09cd2008-10-13 18:11:54 +0000[diff] [blame]83<a name="clang">Clang: C/C++/Objective-C Frontend Toolkit</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]84</h3>
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]85
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]86<div>
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]87
Chris Lattner5de7f6e2010-04-26 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 Wendling16133782011-10-26 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 Lattner25a77902011-11-27 18:47:37 +0000[diff] [blame]95 (32- and 64-bit), and for Darwin/ARM targets.</p>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]96
Chad Rosier06da55e2011-05-27 22:50:46 +0000[diff] [blame]97<p>In the LLVM 3.0 time-frame, the Clang team has made many improvements:</p>
Douglas Gregor936c75b2011-10-15 00:48:01 +0000[diff] [blame]98
99<ul>
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]100 <li>Greatly improved support for building C++ applications, with greater
101 stability and better diagnostics.</li>
Douglas Gregor936c75b2011-10-15 00:48:01 +0000[diff] [blame]102
Bill Wendling16133782011-10-26 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 Lattner25a77902011-11-27 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 Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]108 operators, among others.</li>
Douglas Gregor936c75b2011-10-15 00:48:01 +0000[diff] [blame]109
Bill Wendling16133782011-10-26 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 Gregor936c75b2011-10-15 00:48:01 +0000[diff] [blame]112
Bill Wendling16133782011-10-26 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 Gregor936c75b2011-10-15 00:48:01 +0000[diff] [blame]115
David Chisnall07618782011-11-26 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 Lattner25a77902011-11-27 18:47:37 +0000[diff] [blame]123 <li>A migration tool for moving manual retain/release code to ARC</li>
David Chisnall07618782011-11-26 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 Lattner25a77902011-11-27 18:47:37 +0000[diff] [blame]127 <li>Weak linking support for Objective-C classes</li>
David Chisnall07618782011-11-26 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 Lattner25a77902011-11-27 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 Gregor936c75b2011-10-15 00:48:01 +0000[diff] [blame]135
Bill Wendling16133782011-10-26 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 Gregor936c75b2011-10-15 00:48:01 +0000[diff] [blame]139</ul>
140
Chris Lattnerfd97b882011-04-05 07:19:28 +0000[diff] [blame]141
Duncan Sandsce5d9ae2011-04-06 08:07:40 +0000[diff] [blame]142<p>If Clang rejects your code but another compiler accepts it, please take a
Bill Wendling16133782011-10-26 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 Wendlingef362462008-10-27 09:27:33 +0000[diff] [blame]146
Chris Lattner44c09cd2008-10-13 18:11:54 +0000[diff] [blame]147</div>
148
149<!--=========================================================================-->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]150<h3>
Duncan Sands1cd78982011-04-04 11:09:08 +0000[diff] [blame]151<a name="dragonegg">DragonEgg: GCC front-ends, LLVM back-end</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]152</h3>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]153
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]154<div>
Bill Wendling16133782011-10-26 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 Sandsa294c542011-11-10 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 Sands92452b92010-04-02 09:23:15 +0000[diff] [blame]162
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]163<p>The 3.0 release has the following notable changes:</p>
164
Chris Lattner25a77902011-11-27 18:47:37 +0000[diff] [blame]165 <ul>
Duncan Sandsa294c542011-11-10 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 Lattner25a77902011-11-27 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 Sandsa294c542011-11-10 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 Sands7f9a0dc2010-09-30 17:37:34 +0000[diff] [blame]180</ul>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]181
182</div>
183
Chris Lattner120804a2010-10-03 23:49:06 +0000[diff] [blame]184<!--=========================================================================-->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]185<h3>
Chris Lattner120804a2010-10-03 23:49:06 +0000[diff] [blame]186<a name="compiler-rt">compiler-rt: Compiler Runtime Library</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]187</h3>
Chris Lattner120804a2010-10-03 23:49:06 +0000[diff] [blame]188
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]189<div>
Bill Wendling16133782011-10-26 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 Lattner120804a2010-10-03 23:49:06 +0000[diff] [blame]199
Chris Lattner25a77902011-11-27 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 Lattner120804a2010-10-03 23:49:06 +0000[diff] [blame]203
204</div>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]205
206<!--=========================================================================-->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]207<h3>
Chris Lattner342f9572010-09-29 05:30:03 +0000[diff] [blame]208<a name="lldb">LLDB: Low Level Debugger</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]209</h3>
Chris Lattner342f9572010-09-29 05:30:03 +0000[diff] [blame]210
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]211<div>
Chris Lattnere9a31c42011-11-27 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 Lattner342f9572010-09-29 05:30:03 +0000[diff] [blame]217
Bill Wendling16133782011-10-26 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 Lattner342f9572010-09-29 05:30:03 +0000[diff] [blame]223
224</div>
225
226<!--=========================================================================-->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]227<h3>
Chris Lattner342f9572010-09-29 05:30:03 +0000[diff] [blame]228<a name="libc++">libc++: C++ Standard Library</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]229</h3>
Chris Lattner342f9572010-09-29 05:30:03 +0000[diff] [blame]230
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]231<div>
Chris Lattner342f9572010-09-29 05:30:03 +0000[diff] [blame]232
Bill Wendling16133782011-10-26 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 Lattner342f9572010-09-29 05:30:03 +0000[diff] [blame]236
David Chisnall07618782011-11-26 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 Lattner342f9572010-09-29 05:30:03 +0000[diff] [blame]240</div>
241
Chris Lattnercaefe932011-04-07 03:08:22 +0000[diff] [blame]242<!--=========================================================================-->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]243<h3>
Chris Lattnercaefe932011-04-07 03:08:22 +0000[diff] [blame]244<a name="vmkit">VMKit</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]245</h3>
Chris Lattnercaefe932011-04-07 03:08:22 +0000[diff] [blame]246
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]247<div>
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]248
Nicolas Geoffray5e515792011-11-10 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 Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]274
Chris Lattnercaefe932011-04-07 03:08:22 +0000[diff] [blame]275</div>
276
Chris Lattnere9a31c42011-11-27 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 Dunbar8fbd8aa2010-10-04 17:39:47 +0000[diff] [blame]295<!--=========================================================================-->
Chris Lattner9ee0b012011-04-05 18:38:45 +0000[diff] [blame]296<!--
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]297<h3>
Daniel Dunbar8fbd8aa2010-10-04 17:39:47 +0000[diff] [blame]298<a name="klee">KLEE: A Symbolic Execution Virtual Machine</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]299</h3>
Daniel Dunbar8fbd8aa2010-10-04 17:39:47 +0000[diff] [blame]300
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]301<div>
Daniel Dunbar8fbd8aa2010-10-04 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 Lattner0d364302011-03-10 07:43:44 +0000[diff] [blame]310<p>UPDATE!</p>
Chris Lattner9ee0b012011-04-05 18:38:45 +0000[diff] [blame]311</div>-->
Daniel Dunbar8fbd8aa2010-10-04 17:39:47 +0000[diff] [blame]312
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]313</div>
Daniel Dunbar8fbd8aa2010-10-04 17:39:47 +0000[diff] [blame]314
Chris Lattner53e06f92009-02-26 22:33:38 +0000[diff] [blame]315<!-- *********************************************************************** -->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]316<h2>
Chad Rosier06da55e2011-05-27 22:50:46 +0000[diff] [blame]317 <a name="externalproj">External Open Source Projects Using LLVM 3.0</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]318</h2>
Chris Lattner53e06f92009-02-26 22:33:38 +0000[diff] [blame]319<!-- *********************************************************************** -->
320
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]321<div>
Chris Lattneraa61f412009-10-13 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 Rosier06da55e2011-05-27 22:50:46 +0000[diff] [blame]325 projects that have already been updated to work with LLVM 3.0.</p>
Chris Lattner120804a2010-10-03 23:49:06 +0000[diff] [blame]326
Chris Lattnerae6a89a2011-04-06 01:13:49 +0000[diff] [blame]327<!--=========================================================================-->
Bill Wendling0ed57472011-10-26 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 Wendling3bb971b2011-10-26 00:14:36 +0000[diff] [blame]341<h3>ClamAV</h3>
342
343<div>
Bill Wendling99ba0b62011-10-25 01:01:42 +0000[diff] [blame]344
Bill Wendling3bb971b2011-10-26 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 Lattner48571902011-11-27 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 Wendling3bb971b2011-10-26 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 Grosser8bee91f2011-11-14 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 Wendling5ee37be2011-10-26 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 Wendlingca8dc4a2011-10-29 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 Lattner48571902011-11-27 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 Wendlingca8dc4a2011-10-29 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 Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]399<h3>Crack Programming Language</h3>
Chris Lattnerae6a89a2011-04-06 01:13:49 +0000[diff] [blame]400
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]401<div>
Bill Wendlinged4cc442011-11-03 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 Lattnerae6a89a2011-04-06 01:13:49 +0000[diff] [blame]409</div>
Chris Lattnerae6a89a2011-04-06 01:13:49 +0000[diff] [blame]410
411<!--=========================================================================-->
Bill Wendlingb33bd112011-11-08 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 Lattnere5b37be2011-11-25 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 Wendling3bb93ad2011-10-26 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 Wendling3e3968e2011-10-25 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 Wendlingc902d132011-10-26 04:24:15 +0000[diff] [blame]464 aspect oriented programming language which can create both executables (ELF,
Bill Wendling3e3968e2011-10-25 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 Wendlinga2ae87b2011-10-26 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 Wendlingfc1935c2011-11-07 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 Lattner6d3eeec2011-11-10 20:15:40 +0000[diff] [blame]506 see <a href="http://ispc.github.com/example.html">the walkthrough</a> of a short
Bill Wendlingfc1935c2011-11-07 22:05:17 +0000[diff] [blame]507 example program. ispc is licensed under the BSD license.</p>
508
509</div>
Chris Lattnerc3e4fdc2011-11-25 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 Wendlingfc1935c2011-11-07 22:05:17 +0000[diff] [blame]526
527<!--=========================================================================-->
Bill Wendling4d9c8e52011-10-26 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 Kramera02af612011-11-25 21:26:00 +0000[diff] [blame]538 developed as part of the &Eacute;toil&eacute; desktop environment.</p>
Bill Wendling4d9c8e52011-10-26 18:20:54 +0000[diff] [blame]539
540</div>
541
542<!--=========================================================================-->
Bill Wendlingeda350d2011-11-01 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 Wendlingfd9eb5732011-10-26 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 Lattner48571902011-11-27 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 Wendlingfd9eb5732011-10-26 00:16:17 +0000[diff] [blame]566
567</div>
568
569<!--=========================================================================-->
Tobias Grossercfa35952011-11-14 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 Wendlinge8caad52011-10-25 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 Wendling58209292011-10-25 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 Wendling97b889d2011-10-26 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 Wendlingbf72f2c2011-10-25 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 Wendling8fae82a2011-10-26 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 Wendling53aa7a82011-10-25 20:24:32 +0000[diff] [blame]665<h3>TTA-based Co-design Environment (TCE)</h3>
666
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]667<div>
Bill Wendling53aa7a82011-10-25 20:24:32 +0000[diff] [blame]668
Chris Lattnerae6a89a2011-04-06 01:13:49 +0000[diff] [blame]669<p>TCE is a toolset for designing application-specific processors (ASP) based on
Bill Wendling53aa7a82011-10-25 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 Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]674
Chris Lattnerae6a89a2011-04-06 01:13:49 +0000[diff] [blame]675<p>TCE uses Clang and LLVM for C/C++ language support, target independent
Bill Wendling53aa7a82011-10-25 20:24:32 +0000[diff] [blame]676 optimizations and also for parts of code generation. It generates new
Bill Wendling16133782011-10-26 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 Wendling53aa7a82011-10-25 20:24:32 +0000[diff] [blame]679 per-target recompilation of larger parts of the compiler chain.</p>
Chris Lattnerae6a89a2011-04-06 01:13:49 +0000[diff] [blame]680
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]681</div>
Chris Lattnerae6a89a2011-04-06 01:13:49 +0000[diff] [blame]682
683<!--=========================================================================-->
Bill Wendlingae9aa352011-10-25 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 Wendlingfe845d52011-10-26 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 Wendlingedc20872011-10-29 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 Wendlingfe845d52011-10-26 09:25:01 +0000[diff] [blame]715
716</div>
717
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]718</div>
719
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]720<!-- *********************************************************************** -->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]721<h2>
Chad Rosier06da55e2011-05-27 22:50:46 +0000[diff] [blame]722 <a name="whatsnew">What's New in LLVM 3.0?</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]723</h2>
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]724<!-- *********************************************************************** -->
725
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]726<div>
Chris Lattnerb7bc2aa2008-06-08 22:59:35 +0000[diff] [blame]727
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]728<p>This release includes a huge number of bug fixes, performance tweaks and
Bill Wendling16133782011-10-26 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 Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]731
Chris Lattnera67df2d2010-04-22 06:28:20 +0000[diff] [blame]732<!--=========================================================================-->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]733<h3>
Chris Lattnercdc44ed2008-02-06 18:00:06 +0000[diff] [blame]734<a name="majorfeatures">Major New Features</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]735</h3>
Chris Lattnercdc44ed2008-02-06 18:00:06 +0000[diff] [blame]736
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]737<div>
Chris Lattnercdc44ed2008-02-06 18:00:06 +0000[diff] [blame]738
Chris Lattner25a77902011-11-27 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.
Chris Lattner64421972011-11-27 20:51:47 +0000[diff] [blame]746 Integrated assembler on by default for arm/thumb?
747
Chris Lattner25a77902011-11-27 18:47:37 +0000[diff] [blame]748 -->
749
Chris Lattner64421972011-11-27 20:51:47 +0000[diff] [blame]750 <!-- Near dead:
Chris Lattner92f21832011-11-15 22:13:27 +0000[diff] [blame]751 Analysis/RegionInfo.h + Dom Frontiers
752 SparseBitVector: used in LiveVar.
Chris Lattner3dcdc292011-11-27 08:32:32 +0000[diff] [blame]753 llvm/lib/Archive - replace with lib object?
Chris Lattner64421972011-11-27 20:51:47 +0000[diff] [blame]754 -->
Chris Lattner614d0392011-11-25 20:33:27 +0000[diff] [blame]755
Chris Lattner64497642011-11-27 21:30:28 +0000[diff] [blame]756<p>LLVM 3.0 includes several major changes and big features:</p>
Bill Wendlingd535a6e2011-10-26 18:33:01 +0000[diff] [blame]757
Chris Lattnerb7112222008-06-05 06:25:56 +0000[diff] [blame]758<ul>
Chris Lattner64421972011-11-27 20:51:47 +0000[diff] [blame]759<li>llvm-gcc is no longer supported, and not included in the release. We
760 recommend switching to <a
761 href="http://clang.llvm.org/">Clang</a> or <a
762 href="http://dragonegg.llvm.org/">DragonEgg</a>.</li>
Bill Wendlingd535a6e2011-10-26 18:33:01 +0000[diff] [blame]763
Chris Lattner64421972011-11-27 20:51:47 +0000[diff] [blame]764<li>The linear scan register allocator has been replaced with a new "greedy"
765 register allocator, enabling live range splitting and many other
766 optimizations that lead to better code quality. Please see its <a
767 href="http://blog.llvm.org/2011/09/greedy-register-allocation-in-llvm-30.html">blog post</a> or its talk at the <a
768 href="http://llvm.org/devmtg/2011-11/">Developer Meeting</a>
769 for more information.</li>
Chris Lattner64497642011-11-27 21:30:28 +0000[diff] [blame]770<li>LLVM IR now includes full support for <a href="Atomics.html">atomics
771 memory operations</a> intended to support the C++'11 and C'1x memory models.
772 This includes <a href="LangRef.html#memoryops">atomic load and store,
773 compare and exchange, and read/modify/write instructions</a> as well as a
774 full set of <a href="LangRef.html#ordering">memory ordering constraints</a>.
775 Please see the <a href="Atomics.html">Atomics Guide</a> for more
776 information.
Chris Lattner64421972011-11-27 20:51:47 +0000[diff] [blame]777</li>
778<li>The LLVM IR exception handling representation has been redesigned and
779 reimplemented, making it more elegant, fixing a huge number of bugs, and
780 enabling inlining and other optimizations. Please see its blog post (XXX
Chris Lattner64497642011-11-27 21:30:28 +0000[diff] [blame]781 not yet) and the <a href="ExceptionHandling.html">Exception Handling
782 documentation</a> for more information.</li>
Chris Lattner64421972011-11-27 20:51:47 +0000[diff] [blame]783<li>The LLVM IR Type system has been redesigned and reimplemented, making it
784 faster and solving some long-standing problems.
785 Please see its <a
786 href="http://blog.llvm.org/2011/11/llvm-30-type-system-rewrite.html">blog
787 post</a> for more information.</li>
788
789<li>The MIPS backend has made major leaps in this release, going from an
Chris Lattner64497642011-11-27 21:30:28 +0000[diff] [blame]790 experimental target to being virtually production quality and supporting a
Chris Lattner64421972011-11-27 20:51:47 +0000[diff] [blame]791 wide variety of MIPS subtargets. See the <a href="#MIPS">MIPS section</a>
792 below for more information.</li>
793
794<li>The optimizer and code generator now supports gprof and gcov-style coverage
Chris Lattner64497642011-11-27 21:30:28 +0000[diff] [blame]795 and profiling information, and includes a new llvm-cov tool (but also works
796 with gcov). Clang exposes coverage and profiling through GCC-compatible
797 command line options.</li>
Chris Lattnerdd6acc02008-02-10 08:17:19 +0000[diff] [blame]798</ul>
Mikhail Glushenkov024f7cf2008-10-13 02:08:34 +0000[diff] [blame]799
Bill Wendlingd535a6e2011-10-26 18:33:01 +0000[diff] [blame]800</div>
801
Chris Lattner48571902011-11-27 19:26:30 +0000[diff] [blame]802
803<!--=========================================================================-->
804<h3>
805<a name="coreimprovements">LLVM IR and Core Improvements</a>
806</h3>
807
808<div>
809
810<p>LLVM IR has several new features for better support of new targets and that
811 expose new optimization opportunities:</p>
812
Chris Lattner64497642011-11-27 21:30:28 +0000[diff] [blame]813 <ul>
814 <li><a href="Atomics.html">Atomic memory accesses and memory ordering</a> are
815 now directly expressible in the IR.</li>
816 <li>A new <a href="LangRef.html#int_fma">llvm.fma intrinsic</a> directly
817 represents floating point multiply accumulate operations without an
818 intermediate rounding stage.</li>
819 <li>A new llvm.expect intrinsic (XXX not documented in langref) allows a
820 frontend to express expected control flow (and the __builtin_expect builtin
821 from GNU C).</li>
822 <li>The <a href="LangRef.html#int_prefetch">llvm.prefetch intrinsic</a> now
823 takes a 4th argument that specifies whether the prefetch happens from the
824 icache or dcache.</li>
825 <li>The new <a href="LangRef.html#uwtable">uwtable function attribute</a>
826 allows a frontend to control emission of unwind tables.</li>
827 <li>The new <a href="LangRef.html#fnattrs">nonlazybind function
828 attribute</a> allow optimization of Global Offset Table (GOT) accesses.</li>
829 <li>The new <a href="LangRef.html#returns_twice">returns_twice attribute</a>
830 allows better modeling of functions like setjmp.</li>
831 <li>The <a href="LangRef.html#datalayout">target datalayout</a> string can now
832 encode the natural alignment of the target's stack for better optimization.
833 </li>
834 </ul>
Andrew Trick6c0a11b2011-11-06 17:59:24 +0000[diff] [blame]835</div>
836
837<!--=========================================================================-->
838<h3>
Chris Lattner2b8a52e2008-02-10 07:46:44 +0000[diff] [blame]839<a name="optimizer">Optimizer Improvements</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]840</h3>
Chris Lattner2b8a52e2008-02-10 07:46:44 +0000[diff] [blame]841
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]842<div>
Chris Lattner2b8a52e2008-02-10 07:46:44 +0000[diff] [blame]843
Chris Lattner64497642011-11-27 21:30:28 +0000[diff] [blame]844<p>In addition to many minor performance tweaks and bug fixes, this
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]845 release includes a few major enhancements and additions to the
846 optimizers:</p>
Chris Lattner2b8a52e2008-02-10 07:46:44 +0000[diff] [blame]847
848<ul>
Chris Lattner64497642011-11-27 21:30:28 +0000[diff] [blame]849<li>The pass manager now has an extension API that allows front-ends and plugins
850 to insert their own optimizations in the well-known places in the standard
851 pass optimization pipeline.</li>
Chris Lattner64421972011-11-27 20:51:47 +0000[diff] [blame]852
Benjamin Kramer8c8486d2011-11-26 11:14:54 +0000[diff] [blame]853<li>Information about <a href="BranchWeightMetadata.html">branch probability</a>
854 and basic block frequency is now available within LLVM, based on a
855 combination of static branch prediction heuristics and
856 <code>__builtin_expect</code> calls. That information is currently used for
857 register spill placement and if-conversion, with additional optimizations
858 planned for future releases. The same framework is intended for eventual
859 use with profile-guided optimization.</li>
Chris Lattnerc3a2c982011-04-06 00:45:11 +0000[diff] [blame]860
Chris Lattner64497642011-11-27 21:30:28 +0000[diff] [blame]861<li>The "-indvars" induction variable simplification pass only modifies
862 induction variables when profitable. Sign and zero extension
863 elimination, linear function test replacement, loop unrolling, and
864 other simplifications that require induction variable analysis have
865 been generalized so they no longer require loops to be rewritten into
866 canonical form prior to optimization. This new design
867 preserves more IR level information, avoids undoing earlier loop
868 optimizations (particularly hand-optimized loops), and no longer
869 requires the code generator to reconstruct loops into an optimal form -
870 an intractable problem.</li>
871
872<li>LLVM now includes a pass to optimize retain/release calls for the
873 <a href="http://clang.llvm.org/docs/AutomaticReferenceCounting.html">Automatic
874 Reference Counting</a> (ARC) Objective-C language feature (in
875 lib/Transforms/ObjCARC). It is a decent example of implementing a
876 source-language-specific optimization in LLVM.</li>
877
Chris Lattnerfcc65a72010-10-04 02:42:39 +0000[diff] [blame]878</ul>
879
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]880</div>
Chris Lattnerd1094e02009-03-02 02:37:32 +0000[diff] [blame]881
Chris Lattner7795ea92008-06-08 02:45:07 +0000[diff] [blame]882<!--=========================================================================-->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]883<h3>
Chris Lattnerf25bc192010-09-30 16:31:33 +0000[diff] [blame]884<a name="mc">MC Level Improvements</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]885</h3>
Chris Lattnerf25bc192010-09-30 16:31:33 +0000[diff] [blame]886
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]887<div>
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]888
889<p>The LLVM Machine Code (aka MC) subsystem was created to solve a number of
890 problems in the realm of assembly, disassembly, object file format handling,
891 and a number of other related areas that CPU instruction-set level tools work
892 in.</p>
Chris Lattnerbf1cf672010-10-02 21:59:30 +0000[diff] [blame]893
Chris Lattnerbf1cf672010-10-02 21:59:30 +0000[diff] [blame]894<ul>
Jim Grosbach651e2ee2011-11-24 00:49:21 +0000[diff] [blame]895 <li>The ELF object streamers are much more full featured.</li>
896 <li>Target dependent relocation handling has been refactored into the Targets.</li>
897 <li>Early stage MC-JIT infrastructure has been implemented.</li>
Chris Lattnerbf1cf672010-10-02 21:59:30 +0000[diff] [blame]898</ul>
899
Jim Grosbach651e2ee2011-11-24 00:49:21 +0000[diff] [blame]900<p>The MC-JIT is a major new feature for MC, and will eventually grow to replace
901the current JIT implementation. It emits object files direct to memory and
902uses a runtime dynamic linker to resolve references and drive lazy compilation.
903The MC-JIT enables much greater code reuse between the JIT and the static
904compiler and provides better integration with the platform ABI as a result.</p>
905
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]906<p>For more information, please see
907 the <a href="http://blog.llvm.org/2010/04/intro-to-llvm-mc-project.html">Intro
908 to the LLVM MC Project Blog Post</a>.</p>
Chris Lattnerf25bc192010-09-30 16:31:33 +0000[diff] [blame]909
Chris Lattner64421972011-11-27 20:51:47 +0000[diff] [blame]910
911 InstAliases now automatically used in the asmprinter where they are shorter.
912
913 Table generated MC expansion logic for pseudo instructions that expand to multiple MC instructions through the PseudoInstExpansion class. (JimG)
914
915 #line directives in integrated assembler
916
917 llvm-rtdyld: JimG
918 llvm-objdump / dwarf parser library / llvm-dwarfdump (d0k)
919 object file parsing stuff and llvm-size (mspencer)
920
NAKAMURA Takumi8d89b8e2011-04-05 08:24:22 +0000[diff] [blame]921</div>
Chris Lattnerf25bc192010-09-30 16:31:33 +0000[diff] [blame]922
Chris Lattnerf25bc192010-09-30 16:31:33 +0000[diff] [blame]923<!--=========================================================================-->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]924<h3>
Chris Lattnerd434bfb2009-03-02 03:24:11 +0000[diff] [blame]925<a name="codegen">Target Independent Code Generator Improvements</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]926</h3>
Chris Lattner7795ea92008-06-08 02:45:07 +0000[diff] [blame]927
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]928<div>
Chris Lattner7795ea92008-06-08 02:45:07 +0000[diff] [blame]929
Mikhail Glushenkov25422542009-03-01 18:09:47 +0000[diff] [blame]930<p>We have put a significant amount of work into the code generator
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]931 infrastructure, which allows us to implement more aggressive algorithms and
932 make it run faster:</p>
Chris Lattner7795ea92008-06-08 02:45:07 +0000[diff] [blame]933
934<ul>
Chris Lattner64421972011-11-27 20:51:47 +0000[diff] [blame]935
936 better performance for indirect gotos through new tail dup pass.
937
938 Codegen now supports vector "select" operations on vector comparisons, turning
939 them into various optimized code sequences (e.g. using the SSE4/AVX "blend"
940 instructions).
941
942 EH and debug information produced with CFI directives, yielding smaller executables: http://blog.mozilla.com/respindola/2011/05/12/cfi-directives/
943
944 Domain fixing pass is now target independent (ExecutionDepsFix pass). (Jakob)
945
Chad Rosier06da55e2011-05-27 22:50:46 +0000[diff] [blame]946<!--
947<li></li>
948-->
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]949</ul>
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]950</div>
951
Chris Lattnerd1094e02009-03-02 02:37:32 +0000[diff] [blame]952<!--=========================================================================-->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]953<h3>
Chris Lattnerd1094e02009-03-02 02:37:32 +0000[diff] [blame]954<a name="x86">X86-32 and X86-64 Target Improvements</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]955</h3>
Chris Lattnerd1094e02009-03-02 02:37:32 +0000[diff] [blame]956
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]957<div>
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]958
959<p>New features and major changes in the X86 target include:</p>
Chris Lattnerd1094e02009-03-02 02:37:32 +0000[diff] [blame]960
961<ul>
Benjamin Kramer8c8486d2011-11-26 11:14:54 +0000[diff] [blame]962 <li>The X86 backend, assembler and disassembler now completely support AVX.
963 To enable it pass <code>-mavx</code> to the compiler.</li>
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]964
Chris Lattnerdfcdd0c2011-11-15 22:48:24 +0000[diff] [blame]965 <li>The X86 backend now supports
966 all <a href="http://llvm.org/PR879">inline assembly that uses the X86
967 floating point stack</a>.</li>
968
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]969 <li>The CRC32 intrinsics have been renamed. The intrinsics were previously
970 <code>@llvm.x86.sse42.crc32.[8|16|32]</code>
971 and <code>@llvm.x86.sse42.crc64.[8|64]</code>. They have been renamed to
972 <code>@llvm.x86.sse42.crc32.32.[8|16|32]</code> and
973 <code>@llvm.x86.sse42.crc32.64.[8|64]</code>.</li>
Chad Rosierd1db4f82011-05-27 20:13:10 +0000[diff] [blame]974
Chris Lattner64421972011-11-27 20:51:47 +0000[diff] [blame]975 X86: inline assembler supports .code32 and .code64.
976 AVX support, assembler, compiler and disassembler.
977 X86 backend support for NaCl (David Meyer / Nick L)
978 SSE domain fixing code enabled for AVX (Bruno/Jakob).
979 X86 backend synthesizes horizontal add/sub instructions from generic code.
980 X86: Tons of encoding improvements and new instructions (e.g. Atom, Ivy Bridge,
981 and BMI instructions)
982 added to assembler and disassembler (Craig Topper)
983 X86-64 generates smaller and faster code at -O0 (fast isel improvements)
984
Chris Lattnerd1094e02009-03-02 02:37:32 +0000[diff] [blame]985</ul>
986
Chris Lattnerd1094e02009-03-02 02:37:32 +0000[diff] [blame]987</div>
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]988
989<!--=========================================================================-->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]990<h3>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]991<a name="ARM">ARM Target Improvements</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]992</h3>
Chris Lattnerc92d7692009-03-01 02:30:21 +0000[diff] [blame]993
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]994<div>
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]995
996<p>New features of the ARM target include:</p>
Chris Lattnerc92d7692009-03-01 02:30:21 +0000[diff] [blame]997
998<ul>
Jim Grosbach651e2ee2011-11-24 00:49:21 +0000[diff] [blame]999 <li>Reworked Set Jump Long Jump EH Lowering,</li>
1000 <li>improved support for Cortex-M series processors, and</li>
1001 <li>beta quality integrated assembler support.</li>
Chris Lattner64421972011-11-27 20:51:47 +0000[diff] [blame]1002
1003 Better code generation for Cortex-A9
1004 ARM inline asm constraints implemented.
1005 Old arm disassembler replaced with a new one based on autogenerated encoding information from ARM .td files.
1006 Better performance for Neon code in clang due to SRoA improvements.
1007
Bob Wilsone44f2982010-09-13 17:39:35 +0000[diff] [blame]1008</ul>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]1009</div>
Chris Lattner212a0862011-11-15 22:23:46 +0000[diff] [blame]1010
Chris Lattnerc3a2c982011-04-06 00:45:11 +0000[diff] [blame]1011
1012<!--=========================================================================-->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1013<h3>
Akira Hatanakab89a58d2011-11-15 21:33:05 +0000[diff] [blame]1014<a name="MIPS">MIPS Target Improvements</a>
1015</h3>
1016
1017<div>
1018
1019<p>New features and major changes in the MIPS target include:</p>
1020
1021<ul>
1022 <li>Most MIPS32r1 and r2 instructions are now supported.</li>
1023 <li>LE/BE MIPS32r1/r2 has been tested extensively.</li>
1024 <li>O32 ABI has been fully tested.</li>
1025 <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>
1026 <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>
1027 <li>Support for old-style JIT is complete.</li>
1028 <li>Support for old architectures (MIPS1 and MIPS2) has been removed.</li>
1029 <li>Initial support for MIPS64 has been added.</li>
1030</ul>
1031</div>
Chris Lattner212a0862011-11-15 22:23:46 +0000[diff] [blame]1032
1033<!--=========================================================================-->
1034<h3>
1035 <a name="PTX">PTX Target Improvements</a>
1036</h3>
1037
1038<div>
Akira Hatanakab89a58d2011-11-15 21:33:05 +0000[diff] [blame]1039
Chris Lattner212a0862011-11-15 22:23:46 +0000[diff] [blame]1040 <p>
1041 The PTX back-end is still experimental, but is fairly usable for compute kernels
1042 in LLVM 3.0. Most scalar arithmetic is implemented, as well as intrinsics to
1043 access the special PTX registers and sync instructions. The major missing
1044 pieces are texture/sampler support and some vector operations.</p>
1045
1046 <p>That said, the backend is already being used for domain-specific languages
1047 and works well with the <a href="http://www.pcc.me.uk/~peter/libclc/">libclc
1048 library</a> to supply OpenCL built-ins. With it, you can use Clang to compile
1049 OpenCL code into PTX and execute it by loading the resulting PTX as a binary
1050 blob using the nVidia OpenCL library. It has been tested with several OpenCL
1051 programs, including some from the nVidia GPU Computing SDK, and the performance
1052 is on par with the nVidia compiler.</p>
1053
1054</div>
1055
Akira Hatanakab89a58d2011-11-15 21:33:05 +0000[diff] [blame]1056<!--=========================================================================-->
1057<h3>
Chris Lattnerc3a2c982011-04-06 00:45:11 +0000[diff] [blame]1058<a name="OtherTS">Other Target Specific Improvements</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1059</h3>
Chris Lattnerc92d7692009-03-01 02:30:21 +0000[diff] [blame]1060
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]1061<div>
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1062
Chris Lattner6d3eeec2011-11-10 20:15:40 +0000[diff] [blame]1063 <p>PPC32/ELF va_arg was implemented.</p>
1064 <p>PPC32 initial support for .o file writing was implemented.</p>
Wesley Peck1c29a832011-11-14 18:56:41 +0000[diff] [blame]1065 <p>MicroBlaze scheduling itineraries were added that model the
1066 3-stage and the 5-stage pipeline architectures. The 3-stage
1067 pipeline model can be selected with <code>-mcpu=mblaze3</code>
1068 and the 5-stage pipeline model can be selected with
1069 <code>-mcpu=mblaze5</code>.</p>
Chris Lattner6d3eeec2011-11-10 20:15:40 +0000[diff] [blame]1070
Chris Lattnerc3a2c982011-04-06 00:45:11 +0000[diff] [blame]1071<ul>
Chad Rosier06da55e2011-05-27 22:50:46 +0000[diff] [blame]1072<!--
1073<li></li>
1074-->
Chris Lattnerc3a2c982011-04-06 00:45:11 +0000[diff] [blame]1075</ul>
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1076
Chris Lattnerc3a2c982011-04-06 00:45:11 +0000[diff] [blame]1077</div>
Chris Lattner6cb64032008-06-05 08:02:49 +0000[diff] [blame]1078
1079<!--=========================================================================-->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1080<h3>
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]1081<a name="changes">Major Changes and Removed Features</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1082</h3>
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]1083
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]1084<div>
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]1085
Bill Wendling2d3138c2011-08-03 22:18:20 +0000[diff] [blame]1086<p>If you're already an LLVM user or developer with out-of-tree changes based on
1087 LLVM 2.9, this section lists some "gotchas" that you may run into upgrading
1088 from the previous release.</p>
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]1089
1090<ul>
Chris Lattner64421972011-11-27 20:51:47 +0000[diff] [blame]1091 <li>LLVM's configure script doesn't depend on llvm-gcc anymore, clean layering.</p>
1092 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".
1093 Frontend tests removed from llvm/test/Frontend*
1094 Tablegen has been split into a library, clang tblgen pieces now live in clang.
1095 The llvm version is now named llvm-tblgen instead of tblgen.
1096 PostOrder Dominator frontiers were removed.
1097 LowerSetJmp pass removed, unused.
1098
1099
Chris Lattner3dcdc292011-11-27 08:32:32 +0000[diff] [blame]1100 <li>The <code>LLVMC</code> meta compiler driver was removed.</li>
Jay Foad2755e072011-08-04 10:43:43 +0000[diff] [blame]1101 <li>The <code>LowerSetJmp</code> pass wasn't used effectively by any
1102 target and has been removed.</li>
Rafael Espindolaa45c20b2011-08-30 23:03:45 +0000[diff] [blame]1103 <li>The old <code>TailDup</code> pass was not used in the standard pipeline
1104 and was unable to update ssa form, so it has been removed.
Eli Friedman02e737b2011-08-12 22:50:01 +0000[diff] [blame]1105 <li>The syntax of volatile loads and stores in IR has been changed to
1106 "<code>load volatile</code>"/"<code>store volatile</code>". The old
1107 syntax ("<code>volatile load</code>"/"<code>volatile store</code>")
1108 is still accepted, but is now considered deprecated.</li>
Benjamin Kramera02af612011-11-25 21:26:00 +0000[diff] [blame]1109 <li>The old atomic intrinsics (<code>llvm.memory.barrier</code> and
Eli Friedman2c25d9c2011-10-26 00:55:23 +0000[diff] [blame]1110 <code>llvm.atomic.*</code>) are now gone. Please use the new atomic
1111 instructions, described in the <a href="Atomics.html">atomics guide</a>.
Devang Pateldbf83832008-10-14 20:03:43 +0000[diff] [blame]1112</ul>
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]1113
NAKAMURA Takumi2b462b52011-08-22 23:22:05 +0000[diff] [blame]1114<h4>Windows (32-bit)</h4>
1115<div>
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1116
NAKAMURA Takumi2b462b52011-08-22 23:22:05 +0000[diff] [blame]1117<ul>
1118 <li>On Win32(MinGW32 and MSVC), Windows 2000 will not be supported.
1119 Windows XP or higher is required.</li>
1120</ul>
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1121
NAKAMURA Takumi2b462b52011-08-22 23:22:05 +0000[diff] [blame]1122</div>
1123
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]1124</div>
1125
Daniel Dunbarf70898a2010-10-04 20:11:41 +0000[diff] [blame]1126<!--=========================================================================-->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1127<h3>
Chris Lattnerc3a2c982011-04-06 00:45:11 +0000[diff] [blame]1128<a name="api_changes">Internal API Changes</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1129</h3>
Daniel Dunbarf70898a2010-10-04 20:11:41 +0000[diff] [blame]1130
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]1131<div>
Daniel Dunbarf70898a2010-10-04 20:11:41 +0000[diff] [blame]1132
Chris Lattnerc3a2c982011-04-06 00:45:11 +0000[diff] [blame]1133<p>In addition, many APIs have changed in this release. Some of the major
Bill Wendling46ffaa92011-08-02 06:20:17 +0000[diff] [blame]1134 LLVM API changes are:</p>
Daniel Dunbarf70898a2010-10-04 20:11:41 +0000[diff] [blame]1135
1136<ul>
Benjamin Kramera02af612011-11-25 21:26:00 +0000[diff] [blame]1137 <li>The biggest and most pervasive change is that llvm::Types are no longer
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1138 returned or accepted as 'const' values. Instead, just pass around
Benjamin Kramera02af612011-11-25 21:26:00 +0000[diff] [blame]1139 non-const Types.</li>
Chris Lattner14b3b4d2011-07-18 04:56:02 +0000[diff] [blame]1140
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1141 <li><code>PHINode::reserveOperandSpace</code> has been removed. Instead, you
1142 must specify how many operands to reserve space for when you create the
1143 PHINode, by passing an extra argument
1144 into <code>PHINode::Create</code>.</li>
Jay Foade03f15a2011-07-14 09:19:05 +0000[diff] [blame]1145
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1146 <li>PHINodes no longer store their incoming BasicBlocks as operands. Instead,
1147 the list of incoming BasicBlocks is stored separately, and can be accessed
1148 with new functions <code>PHINode::block_begin</code>
1149 and <code>PHINode::block_end</code>.</li>
Jay Foade03f15a2011-07-14 09:19:05 +0000[diff] [blame]1150
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1151 <li>Various functions now take an <code>ArrayRef</code> instead of either a
1152 pair of pointers (or iterators) to the beginning and end of a range, or a
1153 pointer and a length. Others now return an <code>ArrayRef</code> instead
1154 of a reference to a <code>SmallVector</code>
1155 or <code>std::vector</code>. These include:
Jay Foade03f15a2011-07-14 09:19:05 +0000[diff] [blame]1156<ul>
1157<!-- Please keep this list sorted. -->
Jay Foad5bd375a2011-07-15 08:37:34 +0000[diff] [blame]1158<li><code>CallInst::Create</code></li>
Jay Foade03f15a2011-07-14 09:19:05 +0000[diff] [blame]1159<li><code>ComputeLinearIndex</code> (in <code>llvm/CodeGen/Analysis.h</code>)</li>
1160<li><code>ConstantArray::get</code></li>
1161<li><code>ConstantExpr::getExtractElement</code></li>
Jay Foaded8db7d2011-07-21 14:31:17 +0000[diff] [blame]1162<li><code>ConstantExpr::getGetElementPtr</code></li>
1163<li><code>ConstantExpr::getInBoundsGetElementPtr</code></li>
Jay Foade03f15a2011-07-14 09:19:05 +0000[diff] [blame]1164<li><code>ConstantExpr::getIndices</code></li>
1165<li><code>ConstantExpr::getInsertElement</code></li>
1166<li><code>ConstantExpr::getWithOperands</code></li>
Jay Foadf4b14a22011-07-19 13:32:40 +0000[diff] [blame]1167<li><code>ConstantFoldCall</code> (in <code>llvm/Analysis/ConstantFolding.h</code>)</li>
1168<li><code>ConstantFoldInstOperands</code> (in <code>llvm/Analysis/ConstantFolding.h</code>)</li>
Jay Foade03f15a2011-07-14 09:19:05 +0000[diff] [blame]1169<li><code>ConstantVector::get</code></li>
1170<li><code>DIBuilder::createComplexVariable</code></li>
1171<li><code>DIBuilder::getOrCreateArray</code></li>
1172<li><code>ExtractValueInst::Create</code></li>
1173<li><code>ExtractValueInst::getIndexedType</code></li>
1174<li><code>ExtractValueInst::getIndices</code></li>
1175<li><code>FindInsertedValue</code> (in <code>llvm/Analysis/ValueTracking.h</code>)</li>
Jay Foad528beda2011-07-19 14:42:50 +0000[diff] [blame]1176<li><code>gep_type_begin</code> (in <code>llvm/Support/GetElementPtrTypeIterator.h</code>)</li>
1177<li><code>gep_type_end</code> (in <code>llvm/Support/GetElementPtrTypeIterator.h</code>)</li>
Jay Foadd1b78492011-07-25 09:48:08 +0000[diff] [blame]1178<li><code>GetElementPtrInst::Create</code></li>
1179<li><code>GetElementPtrInst::CreateInBounds</code></li>
1180<li><code>GetElementPtrInst::getIndexedType</code></li>
Jay Foad857a48a2011-07-21 14:42:51 +0000[diff] [blame]1181<li><code>InsertValueInst::Create</code></li>
1182<li><code>InsertValueInst::getIndices</code></li>
1183<li><code>InvokeInst::Create</code></li>
Jay Foad5bd375a2011-07-15 08:37:34 +0000[diff] [blame]1184<li><code>IRBuilder::CreateCall</code></li>
Jay Foade03f15a2011-07-14 09:19:05 +0000[diff] [blame]1185<li><code>IRBuilder::CreateExtractValue</code></li>
Jay Foad040dd822011-07-22 08:16:57 +0000[diff] [blame]1186<li><code>IRBuilder::CreateGEP</code></li>
1187<li><code>IRBuilder::CreateInBoundsGEP</code></li>
Jay Foade03f15a2011-07-14 09:19:05 +0000[diff] [blame]1188<li><code>IRBuilder::CreateInsertValue</code></li>
Jay Foad5bd375a2011-07-15 08:37:34 +0000[diff] [blame]1189<li><code>IRBuilder::CreateInvoke</code></li>
Jay Foade03f15a2011-07-14 09:19:05 +0000[diff] [blame]1190<li><code>MDNode::get</code></li>
1191<li><code>MDNode::getIfExists</code></li>
1192<li><code>MDNode::getTemporary</code></li>
1193<li><code>MDNode::getWhenValsUnresolved</code></li>
Jay Foadb992a632011-07-19 15:07:52 +0000[diff] [blame]1194<li><code>SimplifyGEPInst</code> (in <code>llvm/Analysis/InstructionSimplify.h</code>)</li>
Jay Foadbf904772011-07-19 14:01:37 +0000[diff] [blame]1195<li><code>TargetData::getIndexedOffset</code></li>
Jay Foade03f15a2011-07-14 09:19:05 +0000[diff] [blame]1196</ul></li>
1197
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1198 <li>All forms of <code>StringMap::getOrCreateValue</code> have been remove
1199 except for the one which takes a <code>StringRef</code>.</li>
Jay Foade03f15a2011-07-14 09:19:05 +0000[diff] [blame]1200
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1201 <li>The <code>LLVMBuildUnwind</code> function from the C API was removed. The
1202 LLVM <code>unwind</code> instruction has been deprecated for a long time
1203 and isn't used by the current front-ends. So this was removed during the
1204 exception handling rewrite.</li>
Bill Wendling46ffaa92011-08-02 06:20:17 +0000[diff] [blame]1205
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1206 <li>The <code>LLVMAddLowerSetJmpPass</code> function from the C API was
1207 removed because the <code>LowerSetJmp</code> pass was removed.</li>
Bill Wendling2d3138c2011-08-03 22:18:20 +0000[diff] [blame]1208
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1209 <li>The <code>DIBuilder</code> interface used by front ends to encode
1210 debugging information in the LLVM IR now expects clients to
1211 use <code>DIBuilder::finalize()</code> at the end of translation unit to
1212 complete debugging information encoding.</li>
Devang Patel2b8acaf2011-08-15 23:00:00 +0000[diff] [blame]1213
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1214 <li>The way the type system works has been
1215 rewritten: <code>PATypeHolder</code> and <code>OpaqueType</code> are gone,
1216 and all APIs deal with <code>Type*</code> instead of <code>const
1217 Type*</code>. If you need to create recursive structures, then create a
1218 named structure, and use <code>setBody()</code> when all its elements are
1219 built. Type merging and refining is gone too: named structures are not
1220 merged with other structures, even if their layout is identical. (of
1221 course anonymous structures are still uniqued by layout).</li>
Torok Edwin52cac092011-09-30 13:07:52 +0000[diff] [blame]1222
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1223 <li>TargetSelect.h moved to Support/ from Target/</li>
Torok Edwin52cac092011-09-30 13:07:52 +0000[diff] [blame]1224
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1225 <li>UpgradeIntrinsicCall no longer upgrades pre-2.9 intrinsic calls (for
1226 example <code>llvm.memset.i32</code>).</li>
Torok Edwin52cac092011-09-30 13:07:52 +0000[diff] [blame]1227
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1228 <li>It is mandatory to initialize all out-of-tree passes too and their dependencies now with
1229 <code>INITIALIZE_PASS{BEGIN,END,}</code>
1230 and <code>INITIALIZE_{PASS,AG}_DEPENDENCY</code>.</li>
Torok Edwin52cac092011-09-30 13:07:52 +0000[diff] [blame]1231
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1232 <li>The interface for MemDepResult in MemoryDependenceAnalysis has been
1233 enhanced with new return types Unknown and NonFuncLocal, in addition to
1234 the existing types Clobber, Def, and NonLocal.</li>
Daniel Dunbarf70898a2010-10-04 20:11:41 +0000[diff] [blame]1235</ul>
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1236
Daniel Dunbarf70898a2010-10-04 20:11:41 +0000[diff] [blame]1237</div>
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]1238
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]1239</div>
1240
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]1241<!-- *********************************************************************** -->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1242<h2>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]1243 <a name="knownproblems">Known Problems</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1244</h2>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]1245<!-- *********************************************************************** -->
1246
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]1247<div>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]1248
Chris Lattner080dd7c2011-11-27 19:38:20 +0000[diff] [blame]1249<p>LLVM is generally a production quality compiler, and is used by a broad range
1250 of applications and shipping in many products. That said, not every
1251 subsystem is as mature as the aggregate, particularly the more obscure
1252 targets. If you run into a problem, please check the <a
1253 href="http://llvm.org/bugs/">LLVM bug database</a> and submit a bug if
1254 there isn't already one or ask on the <a
1255 href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVMdev
1256 list</a>.</p>
1257
1258 <p>Known problem areas include:</p>
1259
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]1260<ul>
Chris Lattner080dd7c2011-11-27 19:38:20 +0000[diff] [blame]1261 <li>The Alpha, Blackfin, CellSPU, MSP430, PTX, SystemZ and
Chris Lattner64421972011-11-27 20:51:47 +0000[diff] [blame]1262 XCore backends are experimental, and the Alpha, Blackfin and SystemZ
1263 targets have already been removed from mainline.</li>
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1264
Chris Lattner080dd7c2011-11-27 19:38:20 +0000[diff] [blame]1265 <li>The integrated assembler, disassembler, and JIT is not supported by
1266 several targets. If an integrated assembler is not supported, then a
1267 system assembler is required. For more details, see the <a
1268 href="CodeGenerator.html#targetfeatures">Target Features Matrix</a>.
1269 </li>
1270
1271 <li>The C backend has numerous problems and is not being actively maintained.
1272 Depending on it for anything serious is not advised.</li>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]1273</ul>
1274
1275</div>
John Criswell3bdbd302005-11-08 21:11:33 +0000[diff] [blame]1276
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]1277</div>
1278
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]1279<!-- *********************************************************************** -->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1280<h2>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]1281 <a name="additionalinfo">Additional Information</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1282</h2>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]1283<!-- *********************************************************************** -->
1284
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]1285<div>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]1286
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1287<p>A wide variety of additional information is available on
1288 the <a href="http://llvm.org/">LLVM web page</a>, in particular in
1289 the <a href="http://llvm.org/docs/">documentation</a> section. The web page
1290 also contains versions of the API documentation which is up-to-date with the
1291 Subversion version of the source code. You can access versions of these
1292 documents specific to this release by going into the "<tt>llvm/doc/</tt>"
1293 directory in the LLVM tree.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]1294
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]1295<p>If you have any questions or comments about LLVM, please feel free to contact
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1296 us via the <a href="http://llvm.org/docs/#maillist"> mailing lists</a>.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]1297
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]1298</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]1299
Chris Lattner64421972011-11-27 20:51:47 +0000[diff] [blame]1300<!--=========================================================================-->
1301
1302<!-- EH details: to be moved to a blog post:
1303
1304
1305
1306
1307<p>One of the biggest changes is that 3.0 has a new exception handling
1308 system. The old system used LLVM intrinsics to convey the exception handling
1309 information to the code generator. It worked in most cases, but not
1310 all. Inlining was especially difficult to get right. Also, the intrinsics
1311 could be moved away from the <code>invoke</code> instruction, making it hard
1312 to recover that information.</p>
1313
1314<p>The new EH system makes exception handling a first-class member of the IR. It
1315 adds two new instructions:</p>
1316
1317<ul>
1318 <li><a href="LangRef.html#i_landingpad"><code>landingpad</code></a> &mdash;
1319 this instruction defines a landing pad basic block. It contains all of the
1320 information that's needed by the code generator. It's also required to be
1321 the first non-PHI instruction in the landing pad. In addition, a landing
1322 pad may be jumped to only by the unwind edge of an <code>invoke</code>
1323 instruction.</li>
1324
1325 <li><a href="LangRef.html#i_resume"><code>resume</code></a> &mdash; this
1326 instruction causes the current exception to resume traveling up the
1327 stack. It replaces the <code>@llvm.eh.resume</code> intrinsic.</li>
1328</ul>
1329
1330<p>Converting from the old EH API to the new EH API is rather simple, because a
1331 lot of complexity has been removed. The two intrinsics,
1332 <code>@llvm.eh.exception</code> and <code>@llvm.eh.selector</code> have been
1333 superseded by the <code>landingpad</code> instruction. Instead of generating
1334 a call to <code>@llvm.eh.exception</code> and <code>@llvm.eh.selector</code>:
1335
1336<div class="doc_code">
1337<pre>
1338Function *ExcIntr = Intrinsic::getDeclaration(TheModule,
1339 Intrinsic::eh_exception);
1340Function *SlctrIntr = Intrinsic::getDeclaration(TheModule,
1341 Intrinsic::eh_selector);
1342
1343// The exception pointer.
1344Value *ExnPtr = Builder.CreateCall(ExcIntr, "exc_ptr");
1345
1346std::vector&lt;Value*&gt; Args;
1347Args.push_back(ExnPtr);
1348Args.push_back(Builder.CreateBitCast(Personality,
1349 Type::getInt8PtrTy(Context)));
1350
1351<i>// Add selector clauses to Args.</i>
1352
1353// The selector call.
1354Builder.CreateCall(SlctrIntr, Args, "exc_sel");
1355</pre>
1356</div>
1357
1358<p>You should instead generate a <code>landingpad</code> instruction, that
1359 returns an exception object and selector value:</p>
1360
1361<div class="doc_code">
1362<pre>
1363LandingPadInst *LPadInst =
1364 Builder.CreateLandingPad(StructType::get(Int8PtrTy, Int32Ty, NULL),
1365 Personality, 0);
1366
1367Value *LPadExn = Builder.CreateExtractValue(LPadInst, 0);
1368Builder.CreateStore(LPadExn, getExceptionSlot());
1369
1370Value *LPadSel = Builder.CreateExtractValue(LPadInst, 1);
1371Builder.CreateStore(LPadSel, getEHSelectorSlot());
1372</pre>
1373</div>
1374
1375<p>It's now trivial to add the individual clauses to the <code>landingpad</code>
1376 instruction.</p>
1377
1378<div class="doc_code">
1379<pre>
1380<i><b>// Adding a catch clause</b></i>
1381Constant *TypeInfo = getTypeInfo();
1382LPadInst-&gt;addClause(TypeInfo);
1383
1384<i><b>// Adding a C++ catch-all</b></i>
1385LPadInst-&gt;addClause(Constant::getNullValue(Builder.getInt8PtrTy()));
1386
1387<i><b>// Adding a cleanup</b></i>
1388LPadInst-&gt;setCleanup(true);
1389
1390<i><b>// Adding a filter clause</b></i>
1391std::vector&lt;Constant*&gt; TypeInfos;
1392Constant *TypeInfo = getFilterTypeInfo();
1393TypeInfos.push_back(Builder.CreateBitCast(TypeInfo, Builder.getInt8PtrTy()));
1394
1395ArrayType *FilterTy = ArrayType::get(Int8PtrTy, TypeInfos.size());
1396LPadInst-&gt;addClause(ConstantArray::get(FilterTy, TypeInfos));
1397</pre>
1398</div>
1399
1400<p>Converting from using the <code>@llvm.eh.resume</code> intrinsic to
1401 the <code>resume</code> instruction is trivial. It takes the exception
1402 pointer and exception selector values returned by
1403 the <code>landingpad</code> instruction:</p>
1404
1405<div class="doc_code">
1406<pre>
1407Type *UnwindDataTy = StructType::get(Builder.getInt8PtrTy(),
1408 Builder.getInt32Ty(), NULL);
1409Value *UnwindData = UndefValue::get(UnwindDataTy);
1410Value *ExcPtr = Builder.CreateLoad(getExceptionObjSlot());
1411Value *ExcSel = Builder.CreateLoad(getExceptionSelSlot());
1412UnwindData = Builder.CreateInsertValue(UnwindData, ExcPtr, 0, "exc_ptr");
1413UnwindData = Builder.CreateInsertValue(UnwindData, ExcSel, 1, "exc_sel");
1414Builder.CreateResume(UnwindData);
1415</pre>
1416</div>
1417
1418
1419
1420
1421 -->
1422
1423
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]1424<!-- *********************************************************************** -->
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]1425
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]1426<hr>
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]1427<address>
Misha Brukman8834af92003-12-21 22:53:21 +0000[diff] [blame]1428 <a href="http://jigsaw.w3.org/css-validator/check/referer"><img
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