Anton Korobeynikov | 0d17691 | 2008-06-08 10:23:46 +0000 | [diff] [blame] | 1 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 2 | <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" |
| 3 | "http://www.w3.org/TR/html4/strict.dtd"> |
| 4 | <html> |
| 5 | <head> |
Reid Spencer | 6454ed3 | 2004-11-18 18:38:58 +0000 | [diff] [blame] | 6 | <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 7 | <link rel="stylesheet" href="llvm.css" type="text/css"> |
Chris Lattner | 2b659ef | 2008-02-12 06:29:45 +0000 | [diff] [blame] | 8 | <title>LLVM 2.3 Release Notes</title> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 9 | </head> |
| 10 | <body> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 11 | |
Chris Lattner | 2b659ef | 2008-02-12 06:29:45 +0000 | [diff] [blame] | 12 | <div class="doc_title">LLVM 2.3 Release Notes</div> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 13 | |
| 14 | <ol> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 15 | <li><a href="#intro">Introduction</a></li> |
Chris Lattner | 8348b47 | 2008-06-08 21:58:17 +0000 | [diff] [blame] | 16 | <li><a href="#changes">Major Changes and Sub-project Status</a></li> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 17 | <li><a href="#whatsnew">What's New?</a></li> |
Chris Lattner | 4b538b9 | 2004-04-30 22:17:12 +0000 | [diff] [blame] | 18 | <li><a href="GettingStarted.html">Installation Instructions</a></li> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 19 | <li><a href="#portability">Portability and Supported Platforms</a></li> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 20 | <li><a href="#knownproblems">Known Problems</a> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 21 | <li><a href="#additionalinfo">Additional Information</a></li> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 22 | </ol> |
| 23 | |
Chris Lattner | 7911ce2 | 2004-05-23 21:07:27 +0000 | [diff] [blame] | 24 | <div class="doc_author"> |
Chris Lattner | c463b27 | 2005-10-29 07:07:09 +0000 | [diff] [blame] | 25 | <p>Written by the <a href="http://llvm.org">LLVM Team</a><p> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 26 | </div> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 27 | |
Chris Lattner | 77d29b1 | 2008-06-05 08:02:49 +0000 | [diff] [blame] | 28 | <!-- Done through Week-of-Mon-20080324.txt --> |
| 29 | |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 30 | <!-- *********************************************************************** --> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 31 | <div class="doc_section"> |
| 32 | <a name="intro">Introduction</a> |
| 33 | </div> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 34 | <!-- *********************************************************************** --> |
| 35 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 36 | <div class="doc_text"> |
| 37 | |
| 38 | <p>This document contains the release notes for the LLVM compiler |
Chris Lattner | 2b659ef | 2008-02-12 06:29:45 +0000 | [diff] [blame] | 39 | infrastructure, release 2.3. Here we describe the status of LLVM, including |
Chris Lattner | 57a460e | 2007-05-23 04:39:32 +0000 | [diff] [blame] | 40 | major improvements from the previous release and any known problems. All LLVM |
Chris Lattner | caf0634 | 2007-05-09 04:58:11 +0000 | [diff] [blame] | 41 | releases may be downloaded from the <a href="http://llvm.org/releases/">LLVM |
Chris Lattner | 57a460e | 2007-05-23 04:39:32 +0000 | [diff] [blame] | 42 | releases web site</a>.</p> |
Chris Lattner | 1909261 | 2003-10-02 16:38:05 +0000 | [diff] [blame] | 43 | |
Chris Lattner | 7506b1d | 2004-12-07 08:04:13 +0000 | [diff] [blame] | 44 | <p>For more information about LLVM, including information about the latest |
Chris Lattner | c463b27 | 2005-10-29 07:07:09 +0000 | [diff] [blame] | 45 | release, please check out the <a href="http://llvm.org/">main LLVM |
Chris Lattner | 47ad72c | 2003-10-07 21:38:31 +0000 | [diff] [blame] | 46 | web site</a>. If you have questions or comments, the <a |
| 47 | href="http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVM developer's mailing |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 48 | list</a> is a good place to send them.</p> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 49 | |
Reid Spencer | 669ed45 | 2007-07-09 08:04:31 +0000 | [diff] [blame] | 50 | <p>Note that if you are reading this file from a Subversion checkout or the |
Chris Lattner | 8497764 | 2007-09-21 03:54:09 +0000 | [diff] [blame] | 51 | main LLVM web page, this document applies to the <i>next</i> release, not the |
| 52 | current one. To see the release notes for a specific releases, please see the |
| 53 | <a href="http://llvm.org/releases/">releases page</a>.</p> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 54 | |
| 55 | </div> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 56 | |
| 57 | <!-- *********************************************************************** --> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 58 | <div class="doc_section"> |
Chris Lattner | 8348b47 | 2008-06-08 21:58:17 +0000 | [diff] [blame] | 59 | <a name="changes">Major Changes and Sub-project Status</a> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 60 | </div> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 61 | <!-- *********************************************************************** --> |
| 62 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 63 | <div class="doc_text"> |
| 64 | |
Chris Lattner | 2b659ef | 2008-02-12 06:29:45 +0000 | [diff] [blame] | 65 | <p>This is the fourteenth public release of the LLVM Compiler Infrastructure. |
Chris Lattner | 791f77b | 2008-06-05 06:25:56 +0000 | [diff] [blame] | 66 | It includes a large number of features and refinements from LLVM 2.2.</p> |
Chris Lattner | a509996 | 2003-12-06 20:22:41 +0000 | [diff] [blame] | 67 | |
Chris Lattner | 80453c9 | 2004-05-24 04:50:25 +0000 | [diff] [blame] | 68 | </div> |
| 69 | |
Chris Lattner | 2b659ef | 2008-02-12 06:29:45 +0000 | [diff] [blame] | 70 | <!-- Unfinished features in 2.3: |
Chris Lattner | acce85d | 2008-02-10 07:46:44 +0000 | [diff] [blame] | 71 | Machine LICM |
| 72 | Machine Sinking |
| 73 | LegalizeDAGTypes |
| 74 | --> |
| 75 | |
Chris Lattner | a509996 | 2003-12-06 20:22:41 +0000 | [diff] [blame] | 76 | <!--=========================================================================--> |
Chris Lattner | 8a45876 | 2005-05-15 05:44:51 +0000 | [diff] [blame] | 77 | <div class="doc_subsection"> |
Chris Lattner | 77d29b1 | 2008-06-05 08:02:49 +0000 | [diff] [blame] | 78 | <a name="changes">Major Changes in LLVM 2.3</a> |
Chris Lattner | b4c68cd | 2008-02-10 07:04:35 +0000 | [diff] [blame] | 79 | </div> |
| 80 | |
| 81 | <div class="doc_text"> |
| 82 | |
Chris Lattner | ea34f64 | 2008-06-08 21:34:41 +0000 | [diff] [blame] | 83 | <p>LLVM 2.3 no longer supports llvm-gcc 4.0, it has been replaced with |
| 84 | llvm-gcc 4.2.</p> |
Chris Lattner | 252b83d | 2008-02-06 18:00:06 +0000 | [diff] [blame] | 85 | |
Chris Lattner | ea34f64 | 2008-06-08 21:34:41 +0000 | [diff] [blame] | 86 | <p>LLVM 2.3 no longer includes the <tt>llvm-upgrade</tt> tool. It was useful |
| 87 | for upgrading LLVM 1.9 files to LLVM 2.x syntax, but you can always use a |
| 88 | previous LLVM release to do this. One nice impact of this is that the LLVM |
| 89 | regression test suite no longer depends on llvm-upgrade, which makes it run |
| 90 | faster.</p> |
| 91 | |
| 92 | <p>The <tt>llvm2cpp</tt> tool has been folded into llc, use |
Chris Lattner | e6e1b35 | 2008-06-08 21:19:07 +0000 | [diff] [blame] | 93 | <tt>llc -march=cpp</tt> instead of <tt>llvm2cpp</tt>.</p> |
| 94 | |
Chris Lattner | 0b83220 | 2008-06-08 02:45:07 +0000 | [diff] [blame] | 95 | <p>LLVM API Changes:</p> |
Chris Lattner | 77d29b1 | 2008-06-05 08:02:49 +0000 | [diff] [blame] | 96 | |
Chris Lattner | 0b83220 | 2008-06-08 02:45:07 +0000 | [diff] [blame] | 97 | <ul> |
Chris Lattner | ea34f64 | 2008-06-08 21:34:41 +0000 | [diff] [blame] | 98 | <li>Several core LLVM IR classes have migrated to use the |
| 99 | '<tt>FOOCLASS::Create(...)</tt>' pattern instead of '<tt>new |
| 100 | FOOCLASS(...)</tt>' (e.g. where FOOCLASS=<tt>BasicBlock</tt>). We hope to |
| 101 | standardize on <tt>FOOCLASS::Create</tt> for all IR classes in the future, |
| 102 | but not all of them have been moved over yet.</li> |
Chris Lattner | 0b83220 | 2008-06-08 02:45:07 +0000 | [diff] [blame] | 103 | <li>LLVM 2.3 renames the LLVMBuilder and LLVMFoldingBuilder classes to |
Dan Gohman | e328078 | 2008-06-08 22:57:59 +0000 | [diff] [blame] | 104 | <a href="http://llvm.org/doxygen/classllvm_1_1IRBuilder.html">IRBuilder</a>. |
| 105 | </li> |
| 106 | <li>MRegisterInfo was renamed to |
| 107 | <a href="http://llvm.org/doxygen/classllvm_1_1TargetRegisterInfo.html"> |
| 108 | TargetRegisterInfo</a>.</li> |
| 109 | <li>The MappedFile class is gone, please use |
| 110 | <a href="http://llvm.org/doxygen/classllvm_1_1MemoryBuffer.html"> |
| 111 | MemoryBuffer</a> instead.</li> |
Chris Lattner | ea34f64 | 2008-06-08 21:34:41 +0000 | [diff] [blame] | 112 | <li>The '<tt>-enable-eh</tt>' flag to llc has been removed. Now code should |
| 113 | encode whether it is safe to omit unwind information for a function by |
| 114 | tagging the Function object with the '<tt>nounwind</tt>' attribute.</li> |
Chris Lattner | 0b83220 | 2008-06-08 02:45:07 +0000 | [diff] [blame] | 115 | |
| 116 | </ul> |
Chris Lattner | 252b83d | 2008-02-06 18:00:06 +0000 | [diff] [blame] | 117 | </div> |
| 118 | |
| 119 | <!--=========================================================================--> |
| 120 | <div class="doc_subsection"> |
Chris Lattner | ea34f64 | 2008-06-08 21:34:41 +0000 | [diff] [blame] | 121 | <a name="otherprojects">Other LLVM Sub-Projects</a> |
| 122 | </div> |
| 123 | |
| 124 | <div class="doc_text"> |
Chris Lattner | 8348b47 | 2008-06-08 21:58:17 +0000 | [diff] [blame] | 125 | <p> |
| 126 | The core LLVM 2.3 distribution currently consists of code from the core LLVM |
| 127 | repository (which roughly contains the LLVM optimizer, code generators and |
| 128 | supporting tools) and the llvm-gcc repository. In addition to this code, the |
| 129 | LLVM Project includes other sub-projects that are in development. The two which |
| 130 | are the most actively developed are the new <a href="#vmkit">vmkit Project</a> |
| 131 | and the <a href="#clang">Clang Project</a>. |
| 132 | </p> |
| 133 | </div> |
| 134 | |
| 135 | <!--=========================================================================--> |
| 136 | <div class="doc_subsubsection"> |
| 137 | <a name="vmkit">vmkit</a> |
| 138 | </div> |
| 139 | |
| 140 | <div class="doc_text"> |
| 141 | <p> |
| 142 | The "vmkit" project is a new addition to the LLVM family. It is an |
| 143 | implementation of a JVM and a CLI Virtual Machines (Microsoft .NET is an |
| 144 | implementation of the CLI) using the Just-In-Time compiler of LLVM.</p> |
| 145 | |
| 146 | <p>The JVM, called JnJVM, executes real-world applications such as Apache |
| 147 | projects (e.g. Felix and Tomcat) and the SpecJVM98 benchmark. It uses the GNU |
| 148 | Classpath project for the base classes. The CLI implementation, called N3, is |
| 149 | its in early stages but can execute simple applications and the "pnetmark" |
| 150 | benchmark. It uses the pnetlib project as its core library.</p> |
| 151 | |
| 152 | <p>The 'vmkit' VMs compare in performance with industrial and top open-source |
| 153 | VMs on scientific applications. Besides the JIT, the VMs use many features of |
| 154 | the LLVM framework, including the standard set of optimizations, atomic |
| 155 | operations, custom function provider and memory manager for JITed methods, and |
| 156 | specific virtual machine optimizations. vmkit is not an official part of LLVM |
| 157 | 2.3 release. It is publicly available under the LLVM license and can be |
| 158 | downloaded from: |
| 159 | </p> |
Chris Lattner | ea34f64 | 2008-06-08 21:34:41 +0000 | [diff] [blame] | 160 | |
| 161 | <p> |
Chris Lattner | 8348b47 | 2008-06-08 21:58:17 +0000 | [diff] [blame] | 162 | <tt>svn co http://llvm.org/svn/llvm-project/vmkit/trunk vmkit</tt> |
Chris Lattner | ea34f64 | 2008-06-08 21:34:41 +0000 | [diff] [blame] | 163 | </p> |
| 164 | |
| 165 | </div> |
| 166 | |
| 167 | <!--=========================================================================--> |
Chris Lattner | 8348b47 | 2008-06-08 21:58:17 +0000 | [diff] [blame] | 168 | <div class="doc_subsubsection"> |
| 169 | <a name="clang">Clang</a> |
| 170 | </div> |
| 171 | |
| 172 | <div class="doc_text"> |
| 173 | |
| 174 | <p>The <a href="http://clang.llvm.org/">Clang project</a> is an effort to build |
| 175 | a set of new 'LLVM native' front-end technologies for the LLVM optimizer |
| 176 | and code generator. Clang is continuing to make major strides forward in all |
| 177 | areas. Its C and Objective-C parsing support is very solid, and the code |
| 178 | generation support is far enough along to build many C applications. While not |
| 179 | yet production quality, it is progressing very nicely. In addition, C++ |
| 180 | front-end work has started to make significant progress.</p> |
| 181 | |
| 182 | <p>At this point, Clang is most useful if you are interested in source-to-source |
| 183 | transformations (such as refactoring) and other source-level tools for C and |
| 184 | Objective-C. Clang now also includes tools for turning C code into pretty HTML, |
| 185 | and includes a new <a href="http://clang.llvm.org/StaticAnalysis.html">static |
| 186 | analysis tool</a> in development. This tool is automatically focused on finding |
| 187 | bugs in C and Objective-C code.</p> |
| 188 | |
| 189 | </div> |
| 190 | |
| 191 | |
| 192 | <!-- *********************************************************************** --> |
| 193 | <div class="doc_section"> |
| 194 | <a name="whatsnew">What's New?</a> |
| 195 | </div> |
| 196 | <!-- *********************************************************************** --> |
| 197 | |
Chris Lattner | f8e0b4e | 2008-06-08 22:59:35 +0000 | [diff] [blame^] | 198 | <div class="doc_text"> |
| 199 | |
| 200 | <p>LLVM 2.3 includes a huge number of bug fixes, performance tweaks and minor |
| 201 | improvements. Some of the major improvements and new features are listed in |
| 202 | this section. |
| 203 | </p> |
| 204 | </div> |
| 205 | |
Chris Lattner | 8348b47 | 2008-06-08 21:58:17 +0000 | [diff] [blame] | 206 | <!--=========================================================================--> |
Chris Lattner | ea34f64 | 2008-06-08 21:34:41 +0000 | [diff] [blame] | 207 | <div class="doc_subsection"> |
Chris Lattner | 252b83d | 2008-02-06 18:00:06 +0000 | [diff] [blame] | 208 | <a name="majorfeatures">Major New Features</a> |
| 209 | </div> |
| 210 | |
| 211 | <div class="doc_text"> |
| 212 | |
Chris Lattner | 2b659ef | 2008-02-12 06:29:45 +0000 | [diff] [blame] | 213 | <p>LLVM 2.3 includes several major new capabilities:</p> |
Chris Lattner | f3e5bc6 | 2007-05-14 06:56:09 +0000 | [diff] [blame] | 214 | |
| 215 | <ul> |
Chris Lattner | ea34f64 | 2008-06-08 21:34:41 +0000 | [diff] [blame] | 216 | <li><p>The biggest change in LLVM 2.3 is Multiple Return Value (MRV) support. |
| 217 | MRVs allow LLVM IR to directly represent functions that return multiple |
| 218 | values without having to pass them "by reference" in the LLVM IR. This |
| 219 | allows a front-end to generate more efficient code, as MRVs are generally |
| 220 | returned in registers if a target supports them. See the <a |
| 221 | href="LangRef.html#i_getresult">LLVM IR Reference</a> for more details.</p> |
| 222 | |
| 223 | <p>MRVs are fully supported in the LLVM IR, but are not yet fully supported in |
| 224 | on all targets. However, it is generally safe to return up to 2 values from |
| 225 | a function: most targets should be able to handle at least that. MRV |
| 226 | support is a critical requirement for X86-64 ABI support, as X86-64 requires |
| 227 | the ability to return multiple registers from functions, and we use MRVs to |
| 228 | accomplish this in a direct way.</p></li> |
Chris Lattner | bc5786b | 2008-06-05 06:57:39 +0000 | [diff] [blame] | 229 | |
Chris Lattner | ea34f64 | 2008-06-08 21:34:41 +0000 | [diff] [blame] | 230 | <li><p>LLVM 2.3 includes a complete reimplementation of the "<tt>llvmc</tt>" |
| 231 | tool. It is designed to overcome several problems with the original |
| 232 | <tt>llvmc</tt> and to provide a superset of the features of the |
| 233 | '<tt>gcc</tt>' driver.</p> |
Chris Lattner | bc5786b | 2008-06-05 06:57:39 +0000 | [diff] [blame] | 234 | |
Chris Lattner | ea34f64 | 2008-06-08 21:34:41 +0000 | [diff] [blame] | 235 | <p>The main features of <tt>llvmc2</tt> are: |
| 236 | <ul> |
| 237 | <li>Extended handling of command line options and smart rules for |
| 238 | dispatching them to different tools.</li> |
| 239 | <li>Flexible (and extensible) rules for defining different tools.</li> |
| 240 | <li>The different intermediate steps performed by tools are represented |
| 241 | as edges in the abstract graph.</li> |
| 242 | <li>The 'language' for driver behavior definition is tablegen and thus |
| 243 | it's relatively easy to add new features.</li> |
| 244 | <li>The definition of driver is transformed into set of C++ classes, thus |
| 245 | no runtime interpretation is needed.</li> |
| 246 | </ul></p> |
| 247 | </li> |
Chris Lattner | bc5786b | 2008-06-05 06:57:39 +0000 | [diff] [blame] | 248 | |
Chris Lattner | ea34f64 | 2008-06-08 21:34:41 +0000 | [diff] [blame] | 249 | <li><p>LLVM 2.3 includes a completely rewritten interface for <a |
| 250 | href="LinkTimeOptimization.html">Link Time Optimization</a>. This interface |
| 251 | is written in C, which allows for easier integration with C code bases, and |
| 252 | incorporates improvements we learned about from the first incarnation of the |
| 253 | interface.</p></li> |
Chris Lattner | bc5786b | 2008-06-05 06:57:39 +0000 | [diff] [blame] | 254 | |
Chris Lattner | ea34f64 | 2008-06-08 21:34:41 +0000 | [diff] [blame] | 255 | <li><p>The <a href="tutorial/LangImpl1.html">Kaleidoscope tutorial</a> now |
| 256 | includes a "port" of the tutorial that <a |
| 257 | href="tutorial/OCamlLangImpl1.html">uses the Ocaml bindings</a> to implement |
| 258 | the Kaleidoscope language.</p></li> |
Chris Lattner | bc5786b | 2008-06-05 06:57:39 +0000 | [diff] [blame] | 259 | |
Chris Lattner | 8170c10 | 2008-02-10 08:18:42 +0000 | [diff] [blame] | 260 | </ul> |
| 261 | |
Chris Lattner | f3e5bc6 | 2007-05-14 06:56:09 +0000 | [diff] [blame] | 262 | </div> |
| 263 | |
Chris Lattner | 791f77b | 2008-06-05 06:25:56 +0000 | [diff] [blame] | 264 | |
| 265 | <!--=========================================================================--> |
| 266 | <div class="doc_subsection"> |
Chris Lattner | ea34f64 | 2008-06-08 21:34:41 +0000 | [diff] [blame] | 267 | <a name="llvm-gcc">llvm-gcc 4.2 Improvements</a> |
Chris Lattner | 791f77b | 2008-06-05 06:25:56 +0000 | [diff] [blame] | 268 | </div> |
| 269 | |
| 270 | <div class="doc_text"> |
| 271 | |
Chris Lattner | f8e0b4e | 2008-06-08 22:59:35 +0000 | [diff] [blame^] | 272 | <p>LLVM 2.3 fully supports the llvm-gcc 4.2 front-end, and includes support |
| 273 | for the C, C++, Objective-C, Ada, and Fortran front-ends.</p> |
Chris Lattner | 791f77b | 2008-06-05 06:25:56 +0000 | [diff] [blame] | 274 | |
Chris Lattner | f8e0b4e | 2008-06-08 22:59:35 +0000 | [diff] [blame^] | 275 | <p> |
| 276 | <ul> |
| 277 | <li>llvm-gcc 4.2 includes numerous fixes to better support the Objective-C |
| 278 | front-end. Objective-C now works very well on Mac OS/X.</li> |
Chris Lattner | 791f77b | 2008-06-05 06:25:56 +0000 | [diff] [blame] | 279 | |
Chris Lattner | f8e0b4e | 2008-06-08 22:59:35 +0000 | [diff] [blame^] | 280 | <li>Fortran EQUIVALENCEs are now supported by the gfortran front-end.</li> |
Chris Lattner | 8348b47 | 2008-06-08 21:58:17 +0000 | [diff] [blame] | 281 | |
Chris Lattner | f8e0b4e | 2008-06-08 22:59:35 +0000 | [diff] [blame^] | 282 | <li>llvm-gcc 4.2 includes many other fixes which improve conformance with the |
| 283 | relevant parts of the GCC testsuite.</li> |
| 284 | |
| 285 | </ul></p> |
Chris Lattner | 791f77b | 2008-06-05 06:25:56 +0000 | [diff] [blame] | 286 | |
Chris Lattner | 791f77b | 2008-06-05 06:25:56 +0000 | [diff] [blame] | 287 | </div> |
| 288 | |
| 289 | |
Chris Lattner | 8497764 | 2007-09-21 03:54:09 +0000 | [diff] [blame] | 290 | <!--=========================================================================--> |
| 291 | <div class="doc_subsection"> |
Chris Lattner | f304ffc | 2008-02-10 08:17:19 +0000 | [diff] [blame] | 292 | <a name="coreimprovements">LLVM Core Improvements</a> |
| 293 | </div> |
| 294 | |
| 295 | <div class="doc_text"> |
| 296 | <p>New features include: |
| 297 | </p> |
| 298 | |
Chris Lattner | 791f77b | 2008-06-05 06:25:56 +0000 | [diff] [blame] | 299 | <ul> |
Chris Lattner | f8e0b4e | 2008-06-08 22:59:35 +0000 | [diff] [blame^] | 300 | <li>LLVM IR now directly represents "common" linkage, instead of representing it |
| 301 | as a form of weak linkage.</li> |
| 302 | |
| 303 | <li>LLVM IR now has support for atomic operations, and this functionality can |
| 304 | be accessed through the llvm-gcc "__sync_synchronize", |
| 305 | "__sync_val_compare_and_swap", and related builtins. Support for atomics are |
| 306 | available in the Alpha, X86, X86-64, and PowerPC backends.</li> |
| 307 | |
| 308 | <li>The C and Ocaml bindings have extended to cover pass managers, several |
| 309 | transformation passes, iteration over the LLVM IR, target data, and parameter |
| 310 | attribute lists.</li> |
Chris Lattner | f304ffc | 2008-02-10 08:17:19 +0000 | [diff] [blame] | 311 | </ul> |
| 312 | |
| 313 | </div> |
| 314 | |
| 315 | <!--=========================================================================--> |
| 316 | <div class="doc_subsection"> |
Chris Lattner | acce85d | 2008-02-10 07:46:44 +0000 | [diff] [blame] | 317 | <a name="optimizer">Optimizer Improvements</a> |
| 318 | </div> |
| 319 | |
| 320 | <div class="doc_text"> |
| 321 | |
Chris Lattner | f304ffc | 2008-02-10 08:17:19 +0000 | [diff] [blame] | 322 | <p>In addition to a huge array of bug fixes and minor performance tweaks, the |
Chris Lattner | 2b659ef | 2008-02-12 06:29:45 +0000 | [diff] [blame] | 323 | LLVM 2.3 optimizers support a few major enhancements:</p> |
Chris Lattner | acce85d | 2008-02-10 07:46:44 +0000 | [diff] [blame] | 324 | |
| 325 | <ul> |
| 326 | |
Chris Lattner | f8e0b4e | 2008-06-08 22:59:35 +0000 | [diff] [blame^] | 327 | <li><p>Loop index set splitting on by default. |
| 328 | This transformation hoists conditions from loop bodies and reduces a loop's |
| 329 | iteration space to improve performance. For example,</p> |
| 330 | |
Devang Patel | 83a15d7 | 2008-06-05 21:44:00 +0000 | [diff] [blame] | 331 | <pre> |
Chris Lattner | c4e6b37 | 2008-06-08 20:25:30 +0000 | [diff] [blame] | 332 | for (i = LB; i < UB; ++i) |
| 333 | if (i <= NV) |
Devang Patel | 83a15d7 | 2008-06-05 21:44:00 +0000 | [diff] [blame] | 334 | LOOP_BODY |
| 335 | </pre> |
Chris Lattner | f8e0b4e | 2008-06-08 22:59:35 +0000 | [diff] [blame^] | 336 | |
| 337 | <p>is transformed into:</p> |
| 338 | |
Devang Patel | 83a15d7 | 2008-06-05 21:44:00 +0000 | [diff] [blame] | 339 | <pre> |
| 340 | NUB = min(NV+1, UB) |
Chris Lattner | c4e6b37 | 2008-06-08 20:25:30 +0000 | [diff] [blame] | 341 | for (i = LB; i < NUB; ++i) |
Devang Patel | 83a15d7 | 2008-06-05 21:44:00 +0000 | [diff] [blame] | 342 | LOOP_BODY |
| 343 | </pre> |
| 344 | </li> |
Chris Lattner | 0b83220 | 2008-06-08 02:45:07 +0000 | [diff] [blame] | 345 | |
Chris Lattner | f8e0b4e | 2008-06-08 22:59:35 +0000 | [diff] [blame^] | 346 | <li>LLVM now includes a new <tt>memcpy</tt> optimization pass which removes |
Duncan Sands | 27aff87 | 2008-06-08 20:18:35 +0000 | [diff] [blame] | 347 | dead <tt>memcpy</tt> calls, unneeded copies of aggregates, and performs |
Chris Lattner | 0b83220 | 2008-06-08 02:45:07 +0000 | [diff] [blame] | 348 | return slot optimization. The LLVM optimizer now notices long sequences of |
Duncan Sands | 27aff87 | 2008-06-08 20:18:35 +0000 | [diff] [blame] | 349 | consecutive stores and merges them into <tt>memcpy</tt>'s where profitable.</li> |
Chris Lattner | 0b83220 | 2008-06-08 02:45:07 +0000 | [diff] [blame] | 350 | |
Gabor Greif | 96a89c7 | 2008-06-05 18:39:01 +0000 | [diff] [blame] | 351 | <li>Alignment detection for vector memory references and for <tt>memcpy</tt> and |
| 352 | <tt>memset</tt> is now more aggressive.</li> |
Owen Anderson | 30073ff | 2008-06-06 16:23:15 +0000 | [diff] [blame] | 353 | |
Chris Lattner | f8e0b4e | 2008-06-08 22:59:35 +0000 | [diff] [blame^] | 354 | <li>The Aggressive Dead Code Elimination (ADCE) optimization has been rewritten |
Chris Lattner | 0b83220 | 2008-06-08 02:45:07 +0000 | [diff] [blame] | 355 | to make it both faster and safer in the presence of code containing infinite |
| 356 | loops. Some of its prior functionality has been factored out into the loop |
Chris Lattner | f8e0b4e | 2008-06-08 22:59:35 +0000 | [diff] [blame^] | 357 | deletion pass, which <em>is</em> safe for infinite loops. The new ADCE pass is |
| 358 | no longer based on control dependence, making it run faster.</li> |
Chris Lattner | 0b83220 | 2008-06-08 02:45:07 +0000 | [diff] [blame] | 359 | |
Chris Lattner | 0b83220 | 2008-06-08 02:45:07 +0000 | [diff] [blame] | 360 | <li>The 'SimplifyLibCalls' pass, which optimizes calls to libc and libm |
| 361 | functions for C-based languages, has been rewritten to be a FunctionPass |
| 362 | instead a ModulePass. This allows it to be run more often and to be |
| 363 | included at -O1 in llvm-gcc. It was also extended to include more |
Duncan Sands | 27aff87 | 2008-06-08 20:18:35 +0000 | [diff] [blame] | 364 | optimizations and several corner case bugs were fixed.</li> |
Chris Lattner | 0b83220 | 2008-06-08 02:45:07 +0000 | [diff] [blame] | 365 | |
Duncan Sands | 47eff2b | 2008-06-08 19:38:43 +0000 | [diff] [blame] | 366 | <li>LLVM now includes a simple 'Jump Threading' pass, which attempts to simplify |
Duncan Sands | 27aff87 | 2008-06-08 20:18:35 +0000 | [diff] [blame] | 367 | conditional branches using information about predecessor blocks, simplifying |
Chris Lattner | e6e1b35 | 2008-06-08 21:19:07 +0000 | [diff] [blame] | 368 | the control flow graph. This pass is pretty basic at this point, but |
| 369 | catches some important cases and provides a foundation to build on.</li> |
| 370 | |
| 371 | <li>Several corner case bugs which could lead to deleting volatile memory |
| 372 | accesses have been fixed.</li> |
Chris Lattner | f8e0b4e | 2008-06-08 22:59:35 +0000 | [diff] [blame^] | 373 | |
| 374 | <li>Several optimizations have been sped up, leading to faster code generation |
| 375 | with the same code quality.</li> |
| 376 | |
Chris Lattner | 0b83220 | 2008-06-08 02:45:07 +0000 | [diff] [blame] | 377 | </ul> |
| 378 | |
| 379 | </div> |
| 380 | |
| 381 | <!--=========================================================================--> |
| 382 | <div class="doc_subsection"> |
| 383 | <a name="codegen">Code Generator Improvements</a> |
| 384 | </div> |
| 385 | |
| 386 | <div class="doc_text"> |
| 387 | |
| 388 | <p>We put a significant amount of work into the code generator infrastructure, |
| 389 | which allows us to implement more aggressive algorithms and make it run |
| 390 | faster:</p> |
| 391 | |
| 392 | <ul> |
Dan Gohman | fd0d22e | 2008-06-08 22:49:27 +0000 | [diff] [blame] | 393 | <li>The code generator now has support for carrying information about memory |
| 394 | references throughout the entire code generation process, via the |
| 395 | <a href="http://llvm.org/doxygen/classllvm_1_1MachineMemOperand.html"> |
| 396 | MachineMemOperand</a> class. In the future this will be used to improve |
| 397 | both pre-pass and post-pass scheduling, and to improve compiler-debugging |
| 398 | output.</li> |
Chris Lattner | 0b83220 | 2008-06-08 02:45:07 +0000 | [diff] [blame] | 399 | |
Dan Gohman | e328078 | 2008-06-08 22:57:59 +0000 | [diff] [blame] | 400 | <li>The target-independent code generator infrastructure now uses LLVM's |
| 401 | <a href="http://llvm.org/doxygen/classllvm_1_1APInt.html">APInt</a> |
Chris Lattner | 0b83220 | 2008-06-08 02:45:07 +0000 | [diff] [blame] | 402 | class to handle integer values, which allows it to support integer types |
| 403 | larger than 64 bits. Note that support for such types is also dependent on |
| 404 | target-specific support. Use of APInt is also a step toward support for |
| 405 | non-power-of-2 integer sizes.</li> |
| 406 | |
Chris Lattner | e6e1b35 | 2008-06-08 21:19:07 +0000 | [diff] [blame] | 407 | <li>LLVM 2.3 includes several compile time speedups for code with large basic |
Dan Gohman | eedf6fe | 2008-06-08 22:44:43 +0000 | [diff] [blame] | 408 | blocks, particularly in the instruction selection phase, register |
| 409 | allocation, scheduling, and tail merging/jump threading.</li> |
Chris Lattner | 0b83220 | 2008-06-08 02:45:07 +0000 | [diff] [blame] | 410 | |
| 411 | <li>Several improvements which make llc's <tt>--view-sunit-dags</tt> |
| 412 | visualization of scheduling dependency graphs easier to understand.</li> |
| 413 | |
| 414 | <li>The code generator allows targets to write patterns that generate subreg |
| 415 | references directly in .td files now.</li> |
| 416 | |
| 417 | <li><tt>memcpy</tt> lowering in the backend is more aggressive, particularly for |
| 418 | <tt>memcpy</tt> calls introduced by the code generator when handling |
| 419 | pass-by-value structure argument copies.</li> |
Chris Lattner | e6e1b35 | 2008-06-08 21:19:07 +0000 | [diff] [blame] | 420 | |
| 421 | <li>Inline assembly with multiple register results now returns those results |
| 422 | directly in the appropriate registers, rather than going through memory. |
| 423 | Inline assembly that uses constraints like "ir" with immediates now use the |
| 424 | 'i' form when possible instead of always loading the value in a register. |
| 425 | This saves an instruction and reduces register use.</li> |
| 426 | |
| 427 | <li>Added support for PIC/GOT style tail calls on x86/32 and initial support |
| 428 | for tail calls on PowerPC 32 (it may also work on ppc64 but not |
| 429 | thoroughly tested).</li> |
Chris Lattner | 8497764 | 2007-09-21 03:54:09 +0000 | [diff] [blame] | 430 | </ul> |
| 431 | |
| 432 | </div> |
| 433 | |
| 434 | |
| 435 | <!--=========================================================================--> |
| 436 | <div class="doc_subsection"> |
Chris Lattner | 77d29b1 | 2008-06-05 08:02:49 +0000 | [diff] [blame] | 437 | <a name="x86specific">X86/X86-64 Specific Improvements</a> |
Chris Lattner | 8497764 | 2007-09-21 03:54:09 +0000 | [diff] [blame] | 438 | </div> |
Chris Lattner | 60893e5 | 2007-05-18 06:33:02 +0000 | [diff] [blame] | 439 | |
Chris Lattner | 738bd30 | 2006-04-18 06:32:08 +0000 | [diff] [blame] | 440 | <div class="doc_text"> |
Chris Lattner | f304ffc | 2008-02-10 08:17:19 +0000 | [diff] [blame] | 441 | <p>New target-specific features include: |
Chris Lattner | f3e5bc6 | 2007-05-14 06:56:09 +0000 | [diff] [blame] | 442 | </p> |
Chris Lattner | 2629922 | 2006-11-18 07:51:14 +0000 | [diff] [blame] | 443 | |
| 444 | <ul> |
Chris Lattner | 791f77b | 2008-06-05 06:25:56 +0000 | [diff] [blame] | 445 | <li>llvm-gcc's X86-64 ABI conformance is far improved, particularly in the |
Gabor Greif | 96a89c7 | 2008-06-05 18:39:01 +0000 | [diff] [blame] | 446 | area of passing and returning structures by value. llvm-gcc compiled code |
Chris Lattner | 791f77b | 2008-06-05 06:25:56 +0000 | [diff] [blame] | 447 | now interoperates very well on X86-64 systems with other compilers.</li> |
| 448 | |
Duncan Sands | 47eff2b | 2008-06-08 19:38:43 +0000 | [diff] [blame] | 449 | <li>Support for Win64 was added. This includes code generation itself, JIT |
Anton Korobeynikov | a6094be | 2008-06-08 10:24:13 +0000 | [diff] [blame] | 450 | support and necessary changes to llvm-gcc.</li> |
| 451 | |
Chris Lattner | 791f77b | 2008-06-05 06:25:56 +0000 | [diff] [blame] | 452 | <li>The LLVM X86 backend now supports the support SSE 4.1 instruction set, and |
Chris Lattner | 0b83220 | 2008-06-08 02:45:07 +0000 | [diff] [blame] | 453 | the llvm-gcc 4.2 front-end supports the SSE 4.1 compiler builtins. Various |
| 454 | generic vector operations (insert/extract/shuffle) are much more efficient |
| 455 | when SSE 4.1 is enabled. The JIT automatically takes advantage of these |
| 456 | instructions, but llvm-gcc must be explicitly told to use them, e.g. with |
| 457 | <tt>-march=penryn</tt>.</li> |
Anton Korobeynikov | a6094be | 2008-06-08 10:24:13 +0000 | [diff] [blame] | 458 | |
Chris Lattner | 791f77b | 2008-06-05 06:25:56 +0000 | [diff] [blame] | 459 | <li>The X86 backend now does a number of optimizations that aim to avoid |
| 460 | converting numbers back and forth from SSE registers to the X87 floating |
| 461 | point stack.</li> |
Anton Korobeynikov | a6094be | 2008-06-08 10:24:13 +0000 | [diff] [blame] | 462 | |
Chris Lattner | bc5786b | 2008-06-05 06:57:39 +0000 | [diff] [blame] | 463 | <li>The X86 backend supports stack realignment, which is particularly useful for |
| 464 | vector code on OS's without 16-byte aligned stacks.</li> |
Chris Lattner | 791f77b | 2008-06-05 06:25:56 +0000 | [diff] [blame] | 465 | |
| 466 | <li>The X86 backend now supports the "sseregparm" options in GCC, which allow |
| 467 | functions to be tagged as passing floating point values in SSE |
| 468 | registers.</li> |
| 469 | |
| 470 | <li>Trampolines (taking the address of a nested function) now work on |
Duncan Sands | 27aff87 | 2008-06-08 20:18:35 +0000 | [diff] [blame] | 471 | Linux/X86-64.</li> |
Anton Korobeynikov | a6094be | 2008-06-08 10:24:13 +0000 | [diff] [blame] | 472 | |
Chris Lattner | 77d29b1 | 2008-06-05 08:02:49 +0000 | [diff] [blame] | 473 | <li><tt>__builtin_prefetch</tt> is now compiled into the appropriate prefetch |
| 474 | instructions instead of being ignored.</li> |
Chris Lattner | 791f77b | 2008-06-05 06:25:56 +0000 | [diff] [blame] | 475 | |
Duncan Sands | 27aff87 | 2008-06-08 20:18:35 +0000 | [diff] [blame] | 476 | <li>128-bit integers are now supported on X86-64 targets.</li> |
Dan Gohman | 4e16d40 | 2008-06-05 16:15:39 +0000 | [diff] [blame] | 477 | |
Chris Lattner | 0b83220 | 2008-06-08 02:45:07 +0000 | [diff] [blame] | 478 | <li>The register allocator can now rematerialize PIC-base computations.</li> |
| 479 | |
Chris Lattner | e6e1b35 | 2008-06-08 21:19:07 +0000 | [diff] [blame] | 480 | <li>The "t" and "f" inline assembly constraints for the X87 floating point stack |
| 481 | now work. However, the "u" constraint is still not fully supported.</li> |
| 482 | |
Chris Lattner | bfb17ab | 2007-05-17 21:41:31 +0000 | [diff] [blame] | 483 | </ul> |
Chris Lattner | 8497764 | 2007-09-21 03:54:09 +0000 | [diff] [blame] | 484 | |
Chris Lattner | bfb17ab | 2007-05-17 21:41:31 +0000 | [diff] [blame] | 485 | </div> |
Chris Lattner | c5d658a | 2006-03-03 00:34:26 +0000 | [diff] [blame] | 486 | |
Chris Lattner | 8497764 | 2007-09-21 03:54:09 +0000 | [diff] [blame] | 487 | <!--=========================================================================--> |
| 488 | <div class="doc_subsection"> |
Chris Lattner | 77d29b1 | 2008-06-05 08:02:49 +0000 | [diff] [blame] | 489 | <a name="targetspecific">Other Target Specific Improvements</a> |
| 490 | </div> |
| 491 | |
| 492 | <div class="doc_text"> |
| 493 | <p>New target-specific features include: |
| 494 | </p> |
| 495 | |
| 496 | <ul> |
Gabor Greif | 96a89c7 | 2008-06-05 18:39:01 +0000 | [diff] [blame] | 497 | <li>The LLVM C backend now supports vector code.</li> |
Chris Lattner | 77d29b1 | 2008-06-05 08:02:49 +0000 | [diff] [blame] | 498 | </ul> |
| 499 | |
| 500 | </div> |
| 501 | |
| 502 | |
| 503 | |
| 504 | <!--=========================================================================--> |
| 505 | <div class="doc_subsection"> |
Chris Lattner | 8497764 | 2007-09-21 03:54:09 +0000 | [diff] [blame] | 506 | <a name="otherimprovements">Other Improvements</a> |
| 507 | </div> |
| 508 | |
| 509 | <div class="doc_text"> |
| 510 | <p>New features include: |
| 511 | </p> |
| 512 | |
| 513 | <ul> |
Chris Lattner | bc5786b | 2008-06-05 06:57:39 +0000 | [diff] [blame] | 514 | <li>LLVM now builds with GCC 4.3.</li> |
Chris Lattner | e6e1b35 | 2008-06-08 21:19:07 +0000 | [diff] [blame] | 515 | <li>Bugpoint now supports running custom scripts (with the <tt>-run-custom</tt> |
| 516 | option) to determine how to execute the command and whether it is making |
| 517 | forward process.</li> |
Chris Lattner | 8497764 | 2007-09-21 03:54:09 +0000 | [diff] [blame] | 518 | </ul> |
| 519 | |
| 520 | </div> |
Chris Lattner | c5d658a | 2006-03-03 00:34:26 +0000 | [diff] [blame] | 521 | |
Chris Lattner | 1909261 | 2003-10-02 16:38:05 +0000 | [diff] [blame] | 522 | <!-- *********************************************************************** --> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 523 | <div class="doc_section"> |
| 524 | <a name="portability">Portability and Supported Platforms</a> |
| 525 | </div> |
Chris Lattner | 1909261 | 2003-10-02 16:38:05 +0000 | [diff] [blame] | 526 | <!-- *********************************************************************** --> |
| 527 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 528 | <div class="doc_text"> |
| 529 | |
John Criswell | 0b5b5e9 | 2004-12-08 20:35:47 +0000 | [diff] [blame] | 530 | <p>LLVM is known to work on the following platforms:</p> |
Chris Lattner | 4654bdb | 2004-06-01 18:22:41 +0000 | [diff] [blame] | 531 | |
| 532 | <ul> |
Gabor Greif | 96a89c7 | 2008-06-05 18:39:01 +0000 | [diff] [blame] | 533 | <li>Intel and AMD machines (IA32) running Red Hat Linux, Fedora Core and FreeBSD |
Reid Spencer | 00812e2 | 2005-05-17 02:47:27 +0000 | [diff] [blame] | 534 | (and probably other unix-like systems).</li> |
Chris Lattner | 000c73b | 2008-02-06 06:30:34 +0000 | [diff] [blame] | 535 | <li>PowerPC and X86-based Mac OS X systems, running 10.3 and above in 32-bit and |
Chris Lattner | 2629922 | 2006-11-18 07:51:14 +0000 | [diff] [blame] | 536 | 64-bit modes.</li> |
Chris Lattner | 252b83d | 2008-02-06 18:00:06 +0000 | [diff] [blame] | 537 | <li>Intel and AMD machines running on Win32 using MinGW libraries (native).</li> |
Chris Lattner | 57a460e | 2007-05-23 04:39:32 +0000 | [diff] [blame] | 538 | <li>Intel and AMD machines running on Win32 with the Cygwin libraries (limited |
| 539 | support is available for native builds with Visual C++).</li> |
Gabor Greif | 96a89c7 | 2008-06-05 18:39:01 +0000 | [diff] [blame] | 540 | <li>Sun UltraSPARC workstations running Solaris 10.</li> |
John Criswell | 9321fa8 | 2005-05-13 20:28:15 +0000 | [diff] [blame] | 541 | <li>Alpha-based machines running Debian GNU/Linux.</li> |
Gabor Greif | 96a89c7 | 2008-06-05 18:39:01 +0000 | [diff] [blame] | 542 | <li>Itanium-based (IA64) machines running Linux and HP-UX.</li> |
Chris Lattner | 4654bdb | 2004-06-01 18:22:41 +0000 | [diff] [blame] | 543 | </ul> |
| 544 | |
Chris Lattner | bc5786b | 2008-06-05 06:57:39 +0000 | [diff] [blame] | 545 | <p>The core LLVM infrastructure uses GNU autoconf to adapt itself |
Brian Gaeke | b0fd761 | 2004-05-09 05:28:35 +0000 | [diff] [blame] | 546 | to the machine and operating system on which it is built. However, minor |
| 547 | porting may be required to get LLVM to work on new platforms. We welcome your |
| 548 | portability patches and reports of successful builds or error messages.</p> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 549 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 550 | </div> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 551 | |
| 552 | <!-- *********************************************************************** --> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 553 | <div class="doc_section"> |
| 554 | <a name="knownproblems">Known Problems</a> |
| 555 | </div> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 556 | <!-- *********************************************************************** --> |
| 557 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 558 | <div class="doc_text"> |
| 559 | |
| 560 | <p>This section contains all known problems with the LLVM system, listed by |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 561 | component. As new problems are discovered, they will be added to these |
Chris Lattner | 5eccca4 | 2003-12-12 21:22:16 +0000 | [diff] [blame] | 562 | sections. If you run into a problem, please check the <a |
Chris Lattner | c463b27 | 2005-10-29 07:07:09 +0000 | [diff] [blame] | 563 | href="http://llvm.org/bugs/">LLVM bug database</a> and submit a bug if |
Chris Lattner | 5eccca4 | 2003-12-12 21:22:16 +0000 | [diff] [blame] | 564 | there isn't already one.</p> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 565 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 566 | </div> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 567 | |
Chris Lattner | f5ee170 | 2004-03-14 02:03:02 +0000 | [diff] [blame] | 568 | <!-- ======================================================================= --> |
| 569 | <div class="doc_subsection"> |
| 570 | <a name="experimental">Experimental features included with this release</a> |
| 571 | </div> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 572 | |
Chris Lattner | f5ee170 | 2004-03-14 02:03:02 +0000 | [diff] [blame] | 573 | <div class="doc_text"> |
| 574 | |
Misha Brukman | 6df9e2c | 2004-05-12 21:46:05 +0000 | [diff] [blame] | 575 | <p>The following components of this LLVM release are either untested, known to |
| 576 | be broken or unreliable, or are in early development. These components should |
| 577 | not be relied on, and bugs should not be filed against them, but they may be |
| 578 | useful to some people. In particular, if you would like to work on one of these |
Chris Lattner | 2b659ef | 2008-02-12 06:29:45 +0000 | [diff] [blame] | 579 | components, please contact us on the <a |
| 580 | href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVMdev list</a>.</p> |
Chris Lattner | f5ee170 | 2004-03-14 02:03:02 +0000 | [diff] [blame] | 581 | |
| 582 | <ul> |
Chris Lattner | 2b659ef | 2008-02-12 06:29:45 +0000 | [diff] [blame] | 583 | <li>The MSIL, IA64, Alpha, SPU, and MIPS backends are experimental.</li> |
Duncan Sands | 27aff87 | 2008-06-08 20:18:35 +0000 | [diff] [blame] | 584 | <li>The llc "<tt>-filetype=asm</tt>" (the default) is the only supported |
Chris Lattner | 000c73b | 2008-02-06 06:30:34 +0000 | [diff] [blame] | 585 | value for this option.</li> |
Chris Lattner | f5ee170 | 2004-03-14 02:03:02 +0000 | [diff] [blame] | 586 | </ul> |
| 587 | |
| 588 | </div> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 589 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 590 | <!-- ======================================================================= --> |
| 591 | <div class="doc_subsection"> |
Chris Lattner | 2629922 | 2006-11-18 07:51:14 +0000 | [diff] [blame] | 592 | <a name="x86-be">Known problems with the X86 back-end</a> |
John Criswell | c0c186d | 2005-11-08 21:11:33 +0000 | [diff] [blame] | 593 | </div> |
| 594 | |
| 595 | <div class="doc_text"> |
| 596 | |
| 597 | <ul> |
Anton Korobeynikov | a6094be | 2008-06-08 10:24:13 +0000 | [diff] [blame] | 598 | <li>The X86 backend does not yet support |
| 599 | all <a href="http://llvm.org/PR879">inline assembly that uses the X86 |
| 600 | floating point stack</a>. It supports the 'f' and 't' constraints, but not |
| 601 | 'u'.</li> |
Chris Lattner | e6e1b35 | 2008-06-08 21:19:07 +0000 | [diff] [blame] | 602 | <li>The X86 backend generates inefficient floating point code when configured |
| 603 | to generate code for systems that don't have SSE2.</li> |
Duncan Sands | 47eff2b | 2008-06-08 19:38:43 +0000 | [diff] [blame] | 604 | <li>Win64 code generation wasn't widely tested. Everything should work, but we |
Anton Korobeynikov | a6094be | 2008-06-08 10:24:13 +0000 | [diff] [blame] | 605 | expect small issues to happen. Also, llvm-gcc cannot build mingw64 runtime |
| 606 | currently due |
| 607 | to <a href="http://llvm.org/PR2255">several</a> |
| 608 | <a href="http://llvm.org/PR2257">bugs</a> in FP stackifier |
Chris Lattner | 2629922 | 2006-11-18 07:51:14 +0000 | [diff] [blame] | 609 | </ul> |
| 610 | |
| 611 | </div> |
| 612 | |
| 613 | <!-- ======================================================================= --> |
| 614 | <div class="doc_subsection"> |
| 615 | <a name="ppc-be">Known problems with the PowerPC back-end</a> |
| 616 | </div> |
| 617 | |
| 618 | <div class="doc_text"> |
| 619 | |
| 620 | <ul> |
Nicolas Geoffray | e4285dc | 2007-05-15 09:21:28 +0000 | [diff] [blame] | 621 | <li>The Linux PPC32/ABI support needs testing for the interpreter and static |
Chris Lattner | 57a460e | 2007-05-23 04:39:32 +0000 | [diff] [blame] | 622 | compilation, and lacks support for debug information.</li> |
Chris Lattner | 2629922 | 2006-11-18 07:51:14 +0000 | [diff] [blame] | 623 | </ul> |
| 624 | |
| 625 | </div> |
| 626 | |
| 627 | <!-- ======================================================================= --> |
| 628 | <div class="doc_subsection"> |
Chris Lattner | f3e5bc6 | 2007-05-14 06:56:09 +0000 | [diff] [blame] | 629 | <a name="arm-be">Known problems with the ARM back-end</a> |
| 630 | </div> |
| 631 | |
| 632 | <div class="doc_text"> |
| 633 | |
| 634 | <ul> |
Chris Lattner | 57a460e | 2007-05-23 04:39:32 +0000 | [diff] [blame] | 635 | <li>Thumb mode works only on ARMv6 or higher processors. On sub-ARMv6 |
Duncan Sands | c90d68b | 2007-09-26 15:59:54 +0000 | [diff] [blame] | 636 | processors, thumb programs can crash or produce wrong |
Chris Lattner | 57a460e | 2007-05-23 04:39:32 +0000 | [diff] [blame] | 637 | results (<a href="http://llvm.org/PR1388">PR1388</a>).</li> |
Chris Lattner | f3e5bc6 | 2007-05-14 06:56:09 +0000 | [diff] [blame] | 638 | <li>Compilation for ARM Linux OABI (old ABI) is supported, but not fully tested. |
| 639 | </li> |
Chris Lattner | e6e1b35 | 2008-06-08 21:19:07 +0000 | [diff] [blame] | 640 | <li>There is a bug in QEMU-ARM (<= 0.9.0) which causes it to incorrectly |
| 641 | execute |
Chris Lattner | 57a460e | 2007-05-23 04:39:32 +0000 | [diff] [blame] | 642 | programs compiled with LLVM. Please use more recent versions of QEMU.</li> |
Chris Lattner | f3e5bc6 | 2007-05-14 06:56:09 +0000 | [diff] [blame] | 643 | </ul> |
| 644 | |
| 645 | </div> |
| 646 | |
| 647 | <!-- ======================================================================= --> |
| 648 | <div class="doc_subsection"> |
Chris Lattner | 2629922 | 2006-11-18 07:51:14 +0000 | [diff] [blame] | 649 | <a name="sparc-be">Known problems with the SPARC back-end</a> |
| 650 | </div> |
| 651 | |
| 652 | <div class="doc_text"> |
| 653 | |
| 654 | <ul> |
| 655 | <li>The SPARC backend only supports the 32-bit SPARC ABI (-m32), it does not |
| 656 | support the 64-bit SPARC ABI (-m64).</li> |
| 657 | </ul> |
| 658 | |
| 659 | </div> |
| 660 | |
| 661 | <!-- ======================================================================= --> |
| 662 | <div class="doc_subsection"> |
Chris Lattner | 2629922 | 2006-11-18 07:51:14 +0000 | [diff] [blame] | 663 | <a name="alpha-be">Known problems with the Alpha back-end</a> |
| 664 | </div> |
| 665 | |
| 666 | <div class="doc_text"> |
| 667 | |
| 668 | <ul> |
| 669 | |
| 670 | <li>On 21164s, some rare FP arithmetic sequences which may trap do not have the |
| 671 | appropriate nops inserted to ensure restartability.</li> |
| 672 | |
John Criswell | c0c186d | 2005-11-08 21:11:33 +0000 | [diff] [blame] | 673 | </ul> |
| 674 | </div> |
| 675 | |
Chris Lattner | 2629922 | 2006-11-18 07:51:14 +0000 | [diff] [blame] | 676 | <!-- ======================================================================= --> |
| 677 | <div class="doc_subsection"> |
| 678 | <a name="ia64-be">Known problems with the IA64 back-end</a> |
| 679 | </div> |
| 680 | |
| 681 | <div class="doc_text"> |
| 682 | |
| 683 | <ul> |
| 684 | |
| 685 | <li>C++ programs are likely to fail on IA64, as calls to <tt>setjmp</tt> are |
| 686 | made where the argument is not 16-byte aligned, as required on IA64. (Strictly |
| 687 | speaking this is not a bug in the IA64 back-end; it will also be encountered |
| 688 | when building C++ programs using the C back-end.)</li> |
| 689 | |
| 690 | <li>The C++ front-end does not use <a href="http://llvm.org/PR406">IA64 |
| 691 | ABI compliant layout of v-tables</a>. In particular, it just stores function |
| 692 | pointers instead of function descriptors in the vtable. This bug prevents |
| 693 | mixing C++ code compiled with LLVM with C++ objects compiled by other C++ |
| 694 | compilers.</li> |
| 695 | |
| 696 | <li>There are a few ABI violations which will lead to problems when mixing LLVM |
| 697 | output with code built with other compilers, particularly for floating-point |
| 698 | programs.</li> |
| 699 | |
Duncan Sands | 47eff2b | 2008-06-08 19:38:43 +0000 | [diff] [blame] | 700 | <li>Defining vararg functions is not supported (but calling them is OK).</li> |
Chris Lattner | 2629922 | 2006-11-18 07:51:14 +0000 | [diff] [blame] | 701 | |
Chris Lattner | caf0634 | 2007-05-09 04:58:11 +0000 | [diff] [blame] | 702 | <li>The Itanium backend has bitrotted somewhat.</li> |
Chris Lattner | 2629922 | 2006-11-18 07:51:14 +0000 | [diff] [blame] | 703 | </ul> |
| 704 | |
| 705 | </div> |
| 706 | |
| 707 | <!-- ======================================================================= --> |
| 708 | <div class="doc_subsection"> |
Chris Lattner | f3e5bc6 | 2007-05-14 06:56:09 +0000 | [diff] [blame] | 709 | <a name="c-be">Known problems with the C back-end</a> |
Chris Lattner | 2629922 | 2006-11-18 07:51:14 +0000 | [diff] [blame] | 710 | </div> |
| 711 | |
| 712 | <div class="doc_text"> |
| 713 | |
| 714 | <ul> |
Chris Lattner | 5733b27 | 2008-06-05 06:35:40 +0000 | [diff] [blame] | 715 | <li><a href="http://llvm.org/PR802">The C backend has only basic support for |
| 716 | inline assembly code</a>.</li> |
Chris Lattner | 725a0d8 | 2007-09-26 06:01:35 +0000 | [diff] [blame] | 717 | <li><a href="http://llvm.org/PR1658">The C backend violates the ABI of common |
| 718 | C++ programs</a>, preventing intermixing between C++ compiled by the CBE and |
Duncan Sands | 27aff87 | 2008-06-08 20:18:35 +0000 | [diff] [blame] | 719 | C++ code compiled with llc or native compilers.</li> |
Duncan Sands | f74c0cc | 2008-02-10 13:40:55 +0000 | [diff] [blame] | 720 | <li>The C backend does not support all exception handling constructs.</li> |
Chris Lattner | 2629922 | 2006-11-18 07:51:14 +0000 | [diff] [blame] | 721 | </ul> |
| 722 | |
| 723 | </div> |
John Criswell | c0c186d | 2005-11-08 21:11:33 +0000 | [diff] [blame] | 724 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 725 | |
| 726 | <!-- ======================================================================= --> |
| 727 | <div class="doc_subsection"> |
Chris Lattner | 5733b27 | 2008-06-05 06:35:40 +0000 | [diff] [blame] | 728 | <a name="c-fe">Known problems with the llvm-gcc C front-end</a> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 729 | </div> |
Chris Lattner | 47588f9 | 2003-10-02 05:07:23 +0000 | [diff] [blame] | 730 | |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 731 | <!-- _______________________________________________________________________ --> |
Chris Lattner | b40efb3 | 2003-12-14 05:03:43 +0000 | [diff] [blame] | 732 | <div class="doc_subsubsection">Bugs</div> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 733 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 734 | <div class="doc_text"> |
Chris Lattner | c5d658a | 2006-03-03 00:34:26 +0000 | [diff] [blame] | 735 | |
Chris Lattner | 252b83d | 2008-02-06 18:00:06 +0000 | [diff] [blame] | 736 | <p>llvm-gcc does not currently support <a href="http://llvm.org/PR869">Link-Time |
| 737 | Optimization</a> on most platforms "out-of-the-box". Please inquire on the |
Chris Lattner | f3e5bc6 | 2007-05-14 06:56:09 +0000 | [diff] [blame] | 738 | llvmdev mailing list if you are interested.</p> |
Chris Lattner | d9ea017 | 2006-08-08 17:27:28 +0000 | [diff] [blame] | 739 | |
Chris Lattner | 5733b27 | 2008-06-05 06:35:40 +0000 | [diff] [blame] | 740 | <p>The only major language feature of GCC not supported by llvm-gcc is |
| 741 | the <tt>__builtin_apply</tt> family of builtins. However, some extensions |
| 742 | are only supported on some targets. For example, trampolines are only |
Duncan Sands | 27aff87 | 2008-06-08 20:18:35 +0000 | [diff] [blame] | 743 | supported on some targets (these are used when you take the address of a |
| 744 | nested function).</p> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 745 | |
Chris Lattner | 5733b27 | 2008-06-05 06:35:40 +0000 | [diff] [blame] | 746 | <p>If you run into GCC extensions which are not supported, please let us know. |
| 747 | </p> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 748 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 749 | </div> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 750 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 751 | <!-- ======================================================================= --> |
| 752 | <div class="doc_subsection"> |
Chris Lattner | 5733b27 | 2008-06-05 06:35:40 +0000 | [diff] [blame] | 753 | <a name="c++-fe">Known problems with the llvm-gcc C++ front-end</a> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 754 | </div> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 755 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 756 | <div class="doc_text"> |
| 757 | |
Chris Lattner | f3e5bc6 | 2007-05-14 06:56:09 +0000 | [diff] [blame] | 758 | <p>The C++ front-end is considered to be fully |
Chris Lattner | 7506b1d | 2004-12-07 08:04:13 +0000 | [diff] [blame] | 759 | tested and works for a number of non-trivial programs, including LLVM |
Chris Lattner | f3e5bc6 | 2007-05-14 06:56:09 +0000 | [diff] [blame] | 760 | itself, Qt, Mozilla, etc.</p> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 761 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 762 | <ul> |
Chris Lattner | 5733b27 | 2008-06-05 06:35:40 +0000 | [diff] [blame] | 763 | <li>Exception handling works well on the X86 and PowerPC targets, including |
Duncan Sands | 27aff87 | 2008-06-08 20:18:35 +0000 | [diff] [blame] | 764 | X86-64 darwin. This works when linking to a libstdc++ compiled by GCC. It is |
| 765 | supported on X86-64 linux, but that is disabled by default in this release.</li> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 766 | </ul> |
Chris Lattner | fcc54b3 | 2003-10-07 22:14:37 +0000 | [diff] [blame] | 767 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 768 | </div> |
| 769 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 770 | |
Chris Lattner | 2b659ef | 2008-02-12 06:29:45 +0000 | [diff] [blame] | 771 | <!-- ======================================================================= --> |
| 772 | <div class="doc_subsection"> |
Chris Lattner | 5733b27 | 2008-06-05 06:35:40 +0000 | [diff] [blame] | 773 | <a name="ada-fe">Known problems with the llvm-gcc Ada front-end</a> |
Chris Lattner | 2b659ef | 2008-02-12 06:29:45 +0000 | [diff] [blame] | 774 | </div> |
| 775 | |
| 776 | <div class="doc_text"> |
| 777 | The llvm-gcc 4.2 Ada compiler works fairly well, however this is not a mature |
| 778 | technology and problems should be expected. |
| 779 | <ul> |
Duncan Sands | 27aff87 | 2008-06-08 20:18:35 +0000 | [diff] [blame] | 780 | <li>The Ada front-end currently only builds on X86-32. This is mainly due |
Chris Lattner | 2b659ef | 2008-02-12 06:29:45 +0000 | [diff] [blame] | 781 | to lack of trampoline support (pointers to nested functions) on other platforms, |
Duncan Sands | 27aff87 | 2008-06-08 20:18:35 +0000 | [diff] [blame] | 782 | however it <a href="http://llvm.org/PR2006">also fails to build on X86-64</a> |
Chris Lattner | 2b659ef | 2008-02-12 06:29:45 +0000 | [diff] [blame] | 783 | which does support trampolines.</li> |
| 784 | <li>The Ada front-end <a href="http://llvm.org/PR2007">fails to bootstrap</a>. |
| 785 | Workaround: configure with --disable-bootstrap.</li> |
| 786 | <li>The c380004 and <a href="http://llvm.org/PR2010">c393010</a> ACATS tests |
Duncan Sands | 27aff87 | 2008-06-08 20:18:35 +0000 | [diff] [blame] | 787 | fail (c380004 also fails with gcc-4.2 mainline). When built at -O3, the |
| 788 | <a href="http://llvm.org/PR2421">cxg2021</a> ACATS test also fails.</li> |
| 789 | <li>Some gcc specific Ada tests continue to crash the compiler. The testsuite |
| 790 | reports most tests as having failed even though they pass.</li> |
Chris Lattner | 2b659ef | 2008-02-12 06:29:45 +0000 | [diff] [blame] | 791 | <li>The -E binder option (exception backtraces) |
| 792 | <a href="http://llvm.org/PR1982">does not work</a> and will result in programs |
| 793 | crashing if an exception is raised. Workaround: do not use -E.</li> |
| 794 | <li>Only discrete types <a href="http://llvm.org/PR1981">are allowed to start |
| 795 | or finish at a non-byte offset</a> in a record. Workaround: do not pack records |
| 796 | or use representation clauses that result in a field of a non-discrete type |
| 797 | starting or finishing in the middle of a byte.</li> |
Chris Lattner | e6e1b35 | 2008-06-08 21:19:07 +0000 | [diff] [blame] | 798 | <li>The <tt>lli</tt> interpreter <a href="http://llvm.org/PR2009">considers |
| 799 | 'main' as generated by the Ada binder to be invalid</a>. |
| 800 | Workaround: hand edit the file to use pointers for <tt>argv</tt> and |
| 801 | <tt>envp</tt> rather than integers.</li> |
| 802 | <li>The <tt>-fstack-check</tt> option <a href="http://llvm.org/PR2008">is |
| 803 | ignored</a>.</li> |
Chris Lattner | 2b659ef | 2008-02-12 06:29:45 +0000 | [diff] [blame] | 804 | </ul> |
| 805 | </div> |
| 806 | |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 807 | <!-- *********************************************************************** --> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 808 | <div class="doc_section"> |
| 809 | <a name="additionalinfo">Additional Information</a> |
| 810 | </div> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 811 | <!-- *********************************************************************** --> |
| 812 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 813 | <div class="doc_text"> |
| 814 | |
Chris Lattner | 416db10 | 2005-05-16 17:13:10 +0000 | [diff] [blame] | 815 | <p>A wide variety of additional information is available on the <a |
Chris Lattner | b4b0ce7 | 2007-05-18 00:44:29 +0000 | [diff] [blame] | 816 | href="http://llvm.org">LLVM web page</a>, in particular in the <a |
| 817 | href="http://llvm.org/docs/">documentation</a> section. The web page also |
Reid Spencer | 669ed45 | 2007-07-09 08:04:31 +0000 | [diff] [blame] | 818 | contains versions of the API documentation which is up-to-date with the |
| 819 | Subversion version of the source code. |
Misha Brukman | 109d9e8 | 2005-03-30 19:14:24 +0000 | [diff] [blame] | 820 | You can access versions of these documents specific to this release by going |
| 821 | into the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 822 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 823 | <p>If you have any questions or comments about LLVM, please feel free to contact |
Chris Lattner | c463b27 | 2005-10-29 07:07:09 +0000 | [diff] [blame] | 824 | us via the <a href="http://llvm.org/docs/#maillist"> mailing |
Chris Lattner | 5eccca4 | 2003-12-12 21:22:16 +0000 | [diff] [blame] | 825 | lists</a>.</p> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 826 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 827 | </div> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 828 | |
| 829 | <!-- *********************************************************************** --> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 830 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 831 | <hr> |
Misha Brukman | 2061e89 | 2003-11-22 01:23:39 +0000 | [diff] [blame] | 832 | <address> |
Misha Brukman | 38847d5 | 2003-12-21 22:53:21 +0000 | [diff] [blame] | 833 | <a href="http://jigsaw.w3.org/css-validator/check/referer"><img |
Misha Brukman | 2061e89 | 2003-11-22 01:23:39 +0000 | [diff] [blame] | 834 | src="http://jigsaw.w3.org/css-validator/images/vcss" alt="Valid CSS!"></a> |
| 835 | <a href="http://validator.w3.org/check/referer"><img |
Chris Lattner | 8170c10 | 2008-02-10 08:18:42 +0000 | [diff] [blame] | 836 | src="http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01!"></a> |
Misha Brukman | 2061e89 | 2003-11-22 01:23:39 +0000 | [diff] [blame] | 837 | |
Chris Lattner | b4b0ce7 | 2007-05-18 00:44:29 +0000 | [diff] [blame] | 838 | <a href="http://llvm.org/">LLVM Compiler Infrastructure</a><br> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 839 | Last modified: $Date$ |
Misha Brukman | 2061e89 | 2003-11-22 01:23:39 +0000 | [diff] [blame] | 840 | </address> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 841 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 842 | </body> |
| 843 | </html> |