Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 1 | <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" |
| 2 | "http://www.w3.org/TR/html4/strict.dtd"> |
| 3 | <html> |
| 4 | <head> |
Reid Spencer | 6454ed3 | 2004-11-18 18:38:58 +0000 | [diff] [blame] | 5 | <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 6 | <link rel="stylesheet" href="llvm.css" type="text/css"> |
Jeffrey Yasskin | bec4877 | 2010-01-28 01:14:43 +0000 | [diff] [blame] | 7 | <title>LLVM 2.7 Release Notes</title> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 8 | </head> |
| 9 | <body> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 10 | |
Jeffrey Yasskin | bec4877 | 2010-01-28 01:14:43 +0000 | [diff] [blame] | 11 | <div class="doc_title">LLVM 2.7 Release Notes</div> |
Mikhail Glushenkov | ea65d7d | 2008-10-13 02:08:34 +0000 | [diff] [blame] | 12 | |
Chris Lattner | 0e464a9 | 2010-03-17 04:02:39 +0000 | [diff] [blame] | 13 | <img align=right src="http://llvm.org/img/DragonSmall.png" |
| 14 | width="136" height="136"> |
| 15 | |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 16 | <ol> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 17 | <li><a href="#intro">Introduction</a></li> |
Chris Lattner | 96a445e | 2008-10-13 18:01:01 +0000 | [diff] [blame] | 18 | <li><a href="#subproj">Sub-project Status Update</a></li> |
Jeffrey Yasskin | bec4877 | 2010-01-28 01:14:43 +0000 | [diff] [blame] | 19 | <li><a href="#externalproj">External Projects Using LLVM 2.7</a></li> |
| 20 | <li><a href="#whatsnew">What's New in LLVM 2.7?</a></li> |
Chris Lattner | 4b538b9 | 2004-04-30 22:17:12 +0000 | [diff] [blame] | 21 | <li><a href="GettingStarted.html">Installation Instructions</a></li> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 22 | <li><a href="#portability">Portability and Supported Platforms</a></li> |
Dan Gohman | 44aa921 | 2008-10-14 16:23:02 +0000 | [diff] [blame] | 23 | <li><a href="#knownproblems">Known Problems</a></li> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 24 | <li><a href="#additionalinfo">Additional Information</a></li> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 25 | </ol> |
| 26 | |
Chris Lattner | 7911ce2 | 2004-05-23 21:07:27 +0000 | [diff] [blame] | 27 | <div class="doc_author"> |
Dan Gohman | 44aa921 | 2008-10-14 16:23:02 +0000 | [diff] [blame] | 28 | <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] | 29 | </div> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 30 | |
Jeffrey Yasskin | bec4877 | 2010-01-28 01:14:43 +0000 | [diff] [blame] | 31 | <h1 style="color:red">These are in-progress notes for the upcoming LLVM 2.7 |
| 32 | release.<br> |
| 33 | You may prefer the |
| 34 | <a href="http://llvm.org/releases/2.6/docs/ReleaseNotes.html">LLVM 2.6 |
| 35 | Release Notes</a>.</h1> |
| 36 | |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 37 | <!-- *********************************************************************** --> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 38 | <div class="doc_section"> |
| 39 | <a name="intro">Introduction</a> |
| 40 | </div> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 41 | <!-- *********************************************************************** --> |
| 42 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 43 | <div class="doc_text"> |
| 44 | |
Chris Lattner | f6662f9 | 2008-10-13 17:57:36 +0000 | [diff] [blame] | 45 | <p>This document contains the release notes for the LLVM Compiler |
Jeffrey Yasskin | bec4877 | 2010-01-28 01:14:43 +0000 | [diff] [blame] | 46 | Infrastructure, release 2.7. Here we describe the status of LLVM, including |
Chris Lattner | f6662f9 | 2008-10-13 17:57:36 +0000 | [diff] [blame] | 47 | major improvements from the previous release and significant known problems. |
Mikhail Glushenkov | f795ef0 | 2009-03-01 18:09:47 +0000 | [diff] [blame] | 48 | All LLVM releases may be downloaded from the <a |
Chris Lattner | f6662f9 | 2008-10-13 17:57:36 +0000 | [diff] [blame] | 49 | href="http://llvm.org/releases/">LLVM releases web site</a>.</p> |
Chris Lattner | 1909261 | 2003-10-02 16:38:05 +0000 | [diff] [blame] | 50 | |
Chris Lattner | 7506b1d | 2004-12-07 08:04:13 +0000 | [diff] [blame] | 51 | <p>For more information about LLVM, including information about the latest |
Chris Lattner | c463b27 | 2005-10-29 07:07:09 +0000 | [diff] [blame] | 52 | release, please check out the <a href="http://llvm.org/">main LLVM |
Chris Lattner | 47ad72c | 2003-10-07 21:38:31 +0000 | [diff] [blame] | 53 | web site</a>. If you have questions or comments, the <a |
Chris Lattner | c66bfef | 2010-03-17 04:41:49 +0000 | [diff] [blame] | 54 | href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVM Developer's |
| 55 | Mailing List</a> is a good place to send them.</p> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 56 | |
Mikhail Glushenkov | ea65d7d | 2008-10-13 02:08:34 +0000 | [diff] [blame] | 57 | <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] | 58 | main LLVM web page, this document applies to the <i>next</i> release, not the |
Gabor Greif | fa933f8 | 2008-10-14 11:00:32 +0000 | [diff] [blame] | 59 | current one. To see the release notes for a specific release, please see the |
Chris Lattner | 8497764 | 2007-09-21 03:54:09 +0000 | [diff] [blame] | 60 | <a href="http://llvm.org/releases/">releases page</a>.</p> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 61 | |
Chris Lattner | c66bfef | 2010-03-17 04:41:49 +0000 | [diff] [blame] | 62 | |
Chris Lattner | dc91008 | 2010-03-17 06:41:58 +0000 | [diff] [blame] | 63 | <p>FIXME: llvm.org moved to new server, mention new logo, Ted and Doug new code |
| 64 | owners.</p> |
Chris Lattner | c66bfef | 2010-03-17 04:41:49 +0000 | [diff] [blame] | 65 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 66 | </div> |
Chris Lattner | 61358ab | 2009-10-13 17:48:04 +0000 | [diff] [blame] | 67 | |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 68 | |
Chris Lattner | 61358ab | 2009-10-13 17:48:04 +0000 | [diff] [blame] | 69 | <!-- |
| 70 | Almost dead code. |
| 71 | include/llvm/Analysis/LiveValues.h => Dan |
| 72 | lib/Transforms/IPO/MergeFunctions.cpp => consider for 2.8. |
| 73 | llvm/Analysis/PointerTracking.h => Edwin wants this, consider for 2.8. |
Chris Lattner | 76ef298 | 2010-01-09 22:30:40 +0000 | [diff] [blame] | 74 | ABCD, SCCVN, GEPSplitterPass |
Chris Lattner | 048fe3c | 2010-01-16 21:25:13 +0000 | [diff] [blame] | 75 | MSIL backend? |
Chris Lattner | dc91008 | 2010-03-17 06:41:58 +0000 | [diff] [blame] | 76 | lib/Transforms/Utils/SSI.cpp -> ABCD depends on it. |
Chris Lattner | 61358ab | 2009-10-13 17:48:04 +0000 | [diff] [blame] | 77 | --> |
| 78 | |
| 79 | |
Jeffrey Yasskin | bec4877 | 2010-01-28 01:14:43 +0000 | [diff] [blame] | 80 | <!-- Features that need text if they're finished for 2.7: |
Chris Lattner | 61358ab | 2009-10-13 17:48:04 +0000 | [diff] [blame] | 81 | gcc plugin. |
| 82 | strong phi elim |
| 83 | variable debug info for optimized code |
Chris Lattner | ab68e9e | 2009-02-26 22:33:38 +0000 | [diff] [blame] | 84 | postalloc scheduler: anti dependence breaking, hazard recognizer? |
Chris Lattner | 61358ab | 2009-10-13 17:48:04 +0000 | [diff] [blame] | 85 | metadata |
| 86 | loop dependence analysis |
| 87 | ELF Writer? How stable? |
| 88 | <li>PostRA scheduler improvements, ARM adoption (David Goodwin).</li> |
Chris Lattner | acce85d | 2008-02-10 07:46:44 +0000 | [diff] [blame] | 89 | --> |
Mikhail Glushenkov | ea65d7d | 2008-10-13 02:08:34 +0000 | [diff] [blame] | 90 | |
Chris Lattner | 547a391 | 2008-10-12 19:47:48 +0000 | [diff] [blame] | 91 | <!-- for announcement email: |
Chris Lattner | 61358ab | 2009-10-13 17:48:04 +0000 | [diff] [blame] | 92 | Logo web page. |
| 93 | llvm devmtg |
| 94 | compiler_rt |
| 95 | KLEE web page at klee.llvm.org |
| 96 | Many new papers added to /pubs/ |
Chris Lattner | dc91008 | 2010-03-17 06:41:58 +0000 | [diff] [blame] | 97 | Mention gcc plugin. |
Chris Lattner | 74c80df | 2009-02-25 06:34:50 +0000 | [diff] [blame] | 98 | --> |
Chris Lattner | acce85d | 2008-02-10 07:46:44 +0000 | [diff] [blame] | 99 | |
Chris Lattner | 96a445e | 2008-10-13 18:01:01 +0000 | [diff] [blame] | 100 | <!-- *********************************************************************** --> |
| 101 | <div class="doc_section"> |
| 102 | <a name="subproj">Sub-project Status Update</a> |
Chris Lattner | ea34f64 | 2008-06-08 21:34:41 +0000 | [diff] [blame] | 103 | </div> |
Chris Lattner | 96a445e | 2008-10-13 18:01:01 +0000 | [diff] [blame] | 104 | <!-- *********************************************************************** --> |
Chris Lattner | ea34f64 | 2008-06-08 21:34:41 +0000 | [diff] [blame] | 105 | |
| 106 | <div class="doc_text"> |
Chris Lattner | 8348b47 | 2008-06-08 21:58:17 +0000 | [diff] [blame] | 107 | <p> |
Jeffrey Yasskin | bec4877 | 2010-01-28 01:14:43 +0000 | [diff] [blame] | 108 | The LLVM 2.7 distribution currently consists of code from the core LLVM |
Chris Lattner | 61358ab | 2009-10-13 17:48:04 +0000 | [diff] [blame] | 109 | repository (which roughly includes the LLVM optimizers, code generators |
| 110 | and supporting tools), the Clang repository and the llvm-gcc repository. In |
| 111 | addition to this code, the LLVM Project includes other sub-projects that are in |
| 112 | development. Here we include updates on these subprojects. |
Bill Wendling | 63d8c55 | 2009-03-02 04:28:57 +0000 | [diff] [blame] | 113 | </p> |
Chris Lattner | 96a445e | 2008-10-13 18:01:01 +0000 | [diff] [blame] | 114 | |
Chris Lattner | 8348b47 | 2008-06-08 21:58:17 +0000 | [diff] [blame] | 115 | </div> |
| 116 | |
Chris Lattner | 96a445e | 2008-10-13 18:01:01 +0000 | [diff] [blame] | 117 | |
Chris Lattner | 8348b47 | 2008-06-08 21:58:17 +0000 | [diff] [blame] | 118 | <!--=========================================================================--> |
Chris Lattner | 96a445e | 2008-10-13 18:01:01 +0000 | [diff] [blame] | 119 | <div class="doc_subsection"> |
Chris Lattner | fb97b2d | 2008-10-13 18:11:54 +0000 | [diff] [blame] | 120 | <a name="clang">Clang: C/C++/Objective-C Frontend Toolkit</a> |
Chris Lattner | 8348b47 | 2008-06-08 21:58:17 +0000 | [diff] [blame] | 121 | </div> |
| 122 | |
| 123 | <div class="doc_text"> |
| 124 | |
Jeffrey Yasskin | bec4877 | 2010-01-28 01:14:43 +0000 | [diff] [blame] | 125 | <p>The <a href="http://clang.llvm.org/">Clang project</a> is ...</p> |
Chris Lattner | 61358ab | 2009-10-13 17:48:04 +0000 | [diff] [blame] | 126 | |
Jeffrey Yasskin | bec4877 | 2010-01-28 01:14:43 +0000 | [diff] [blame] | 127 | <p>In the LLVM 2.7 time-frame, the Clang team has made many improvements:</p> |
Bill Wendling | 741748a | 2008-10-27 09:27:33 +0000 | [diff] [blame] | 128 | |
Daniel Dunbar | 1373943 | 2008-10-14 23:25:09 +0000 | [diff] [blame] | 129 | <ul> |
Daniel Dunbar | 60dadb6 | 2010-03-25 16:09:18 +0000 | [diff] [blame] | 130 | <li>FIXME: C++! Include a link to cxx_compatibility.html</li> |
| 131 | |
| 132 | <li>FIXME: Static Analyzer improvements?</li> |
| 133 | |
| 134 | <li>CIndex API and Python bindings: Clang now includes a C API as part of the |
| 135 | CIndex library. Although we make make some changes to the API in the future, it |
| 136 | is intended to be stable and has been designed for use by external projects. See |
| 137 | the Clang |
| 138 | doxygen <a href="http://clang.llvm.org/doxygen/group__CINDEX.html">CIndex</a> |
| 139 | documentation for more details. The CIndex API also includings an preliminary |
| 140 | set of Python bindings.</li> |
| 141 | |
| 142 | <li>ARM Support: Clang now has ABI support for both the Darwin and Linux ARM |
| 143 | ABIs. Coupled with many improvements to the LLVM ARM backend, Clang is now |
| 144 | suitable for use as a a beta quality ARM compiler.</li> |
Bill Wendling | 6bc1528 | 2009-03-02 04:28:18 +0000 | [diff] [blame] | 145 | </ul> |
Chris Lattner | fb97b2d | 2008-10-13 18:11:54 +0000 | [diff] [blame] | 146 | </div> |
| 147 | |
| 148 | <!--=========================================================================--> |
| 149 | <div class="doc_subsection"> |
| 150 | <a name="clangsa">Clang Static Analyzer</a> |
| 151 | </div> |
| 152 | |
| 153 | <div class="doc_text"> |
| 154 | |
Jeffrey Yasskin | bec4877 | 2010-01-28 01:14:43 +0000 | [diff] [blame] | 155 | <p>Previously announced in the 2.4, 2.5, and 2.6 LLVM releases, the Clang project also |
Ted Kremenek | 8b3894c | 2009-02-27 07:01:32 +0000 | [diff] [blame] | 156 | includes an early stage static source code analysis tool for <a |
| 157 | href="http://clang.llvm.org/StaticAnalysis.html">automatically finding bugs</a> |
Chris Lattner | 61358ab | 2009-10-13 17:48:04 +0000 | [diff] [blame] | 158 | in C and Objective-C programs. The tool performs checks to find |
Ted Kremenek | 8b3894c | 2009-02-27 07:01:32 +0000 | [diff] [blame] | 159 | bugs that occur on a specific path within a program.</p> |
Chris Lattner | cc04261 | 2008-10-14 00:52:49 +0000 | [diff] [blame] | 160 | |
Chris Lattner | 0e464a9 | 2010-03-17 04:02:39 +0000 | [diff] [blame] | 161 | <p>In the LLVM 2.7 time-frame, the analyzer core has sprouted legs and...</p> |
Chris Lattner | 8348b47 | 2008-06-08 21:58:17 +0000 | [diff] [blame] | 162 | |
| 163 | </div> |
| 164 | |
Chris Lattner | 96a445e | 2008-10-13 18:01:01 +0000 | [diff] [blame] | 165 | <!--=========================================================================--> |
| 166 | <div class="doc_subsection"> |
Nicolas Geoffray | 99a4d30 | 2008-10-14 19:23:04 +0000 | [diff] [blame] | 167 | <a name="vmkit">VMKit: JVM/CLI Virtual Machine Implementation</a> |
Chris Lattner | 96a445e | 2008-10-13 18:01:01 +0000 | [diff] [blame] | 168 | </div> |
| 169 | |
| 170 | <div class="doc_text"> |
| 171 | <p> |
Nicolas Geoffray | 99a4d30 | 2008-10-14 19:23:04 +0000 | [diff] [blame] | 172 | The <a href="http://vmkit.llvm.org/">VMKit project</a> is an implementation of |
Chris Lattner | 61358ab | 2009-10-13 17:48:04 +0000 | [diff] [blame] | 173 | a JVM and a CLI Virtual Machine (Microsoft .NET is an |
| 174 | implementation of the CLI) using LLVM for static and just-in-time |
| 175 | compilation.</p> |
Chris Lattner | 96a445e | 2008-10-13 18:01:01 +0000 | [diff] [blame] | 176 | |
Chris Lattner | 61358ab | 2009-10-13 17:48:04 +0000 | [diff] [blame] | 177 | <p> |
Chris Lattner | bf8e516 | 2010-03-29 18:34:13 +0000 | [diff] [blame] | 178 | With the release of LLVM 2.7, VMKit has shifted to a great framework for writing |
| 179 | virtual machines. VMKit now offers precise and efficient garbage collection with |
| 180 | multi-threading support, thanks to the MMTk memory management toolkit, as well |
| 181 | as just in time and ahead of time compilation with LLVM. The major changes in |
| 182 | VMKit 0.27 are:</p> |
Chris Lattner | 96a445e | 2008-10-13 18:01:01 +0000 | [diff] [blame] | 183 | |
Nicolas Geoffray | 99a4d30 | 2008-10-14 19:23:04 +0000 | [diff] [blame] | 184 | <ul> |
| 185 | |
Chris Lattner | bf8e516 | 2010-03-29 18:34:13 +0000 | [diff] [blame] | 186 | <li>Garbage collection: VMKit now uses the MMTk toolkit for garbage collectors. |
| 187 | The first collector to be ported is the MarkSweep collector, which is precise, |
| 188 | and drastically improves the performance of VMKit.</li> |
| 189 | <li>Line number information in the JVM: by using the debug metadata of LLVM, the |
| 190 | JVM now supports precise line number information, useful when printing a stack |
| 191 | trace.</li> |
| 192 | <li>Interface calls in the JVM: we implemented a variant of the Interface Method |
| 193 | Table technique for interface calls in the JVM. |
| 194 | </li> |
Nicolas Geoffray | 99a4d30 | 2008-10-14 19:23:04 +0000 | [diff] [blame] | 195 | |
| 196 | </ul> |
Chris Lattner | 96a445e | 2008-10-13 18:01:01 +0000 | [diff] [blame] | 197 | </div> |
| 198 | |
Chris Lattner | 61358ab | 2009-10-13 17:48:04 +0000 | [diff] [blame] | 199 | |
| 200 | <!--=========================================================================--> |
| 201 | <div class="doc_subsection"> |
| 202 | <a name="compiler-rt">compiler-rt: Compiler Runtime Library</a> |
| 203 | </div> |
| 204 | |
| 205 | <div class="doc_text"> |
| 206 | <p> |
| 207 | The new LLVM <a href="http://compiler-rt.llvm.org/">compiler-rt project</a> |
| 208 | is a simple library that provides an implementation of the low-level |
| 209 | target-specific hooks required by code generation and other runtime components. |
| 210 | For example, when compiling for a 32-bit target, converting a double to a 64-bit |
| 211 | unsigned integer is compiled into a runtime call to the "__fixunsdfdi" |
| 212 | function. The compiler-rt library provides highly optimized implementations of |
| 213 | this and other low-level routines (some are 3x faster than the equivalent |
| 214 | libgcc routines).</p> |
| 215 | |
| 216 | <p> |
| 217 | All of the code in the compiler-rt project is available under the standard LLVM |
| 218 | License, a "BSD-style" license.</p> |
| 219 | |
| 220 | </div> |
| 221 | |
| 222 | <!--=========================================================================--> |
| 223 | <div class="doc_subsection"> |
Duncan Sands | 749fd83 | 2010-04-02 09:23:15 +0000 | [diff] [blame] | 224 | <a name="dragonegg">DragonEgg: llvm-gcc ported to gcc-4.5</a> |
Chris Lattner | 61358ab | 2009-10-13 17:48:04 +0000 | [diff] [blame] | 225 | </div> |
| 226 | |
| 227 | <div class="doc_text"> |
| 228 | <p> |
Duncan Sands | 749fd83 | 2010-04-02 09:23:15 +0000 | [diff] [blame] | 229 | <a href="http://dragonegg.llvm.org/">DragonEgg</a> is a port of llvm-gcc to |
| 230 | gcc-4.5. Unlike llvm-gcc, which makes many intrusive changes to the underlying |
| 231 | gcc-4.2 code, dragonegg in theory does not require any gcc-4.5 modifications |
| 232 | whatsoever (currently one small patch is needed). This is thanks to the new |
| 233 | <a href="http://gcc.gnu.org/wiki/plugins">gcc plugin architecture</a>, which |
| 234 | makes it possible to modify the behaviour of gcc at runtime by loading a plugin, |
| 235 | which is nothing more than a dynamic library which conforms to the gcc plugin |
| 236 | interface. DragonEgg is a gcc plugin that causes the LLVM optimizers to be run |
| 237 | instead of the gcc optimizers, and the LLVM code generators instead of the gcc |
| 238 | code generators, just like llvm-gcc. To use it, you add |
| 239 | "-fplugin=path/dragonegg.so" to the gcc-4.5 command line, and gcc-4.5 magically |
| 240 | becomes llvm-gcc-4.5! |
| 241 | </p> |
| 242 | |
| 243 | <p> |
| 244 | DragonEgg is still a work in progress. Currently C works very well, while C++, |
| 245 | Ada and Fortran work fairly well. All other languages either don't work at all, |
| 246 | or only work poorly. For the moment only the x86-32 and x86-64 targets are |
| 247 | supported, and only on linux. |
| 248 | </p> |
| 249 | |
| 250 | <p> |
| 251 | DragonEgg has not yet been released. Once gcc-4.5 has been released, dragonegg |
| 252 | will probably be released as part of the following LLVM release. |
Chris Lattner | 61358ab | 2009-10-13 17:48:04 +0000 | [diff] [blame] | 253 | </p> |
| 254 | |
| 255 | </div> |
| 256 | |
| 257 | |
| 258 | <!--=========================================================================--> |
| 259 | <div class="doc_subsection"> |
| 260 | <a name="mc">llvm-mc: Machine Code Toolkit</a> |
| 261 | </div> |
| 262 | |
| 263 | <div class="doc_text"> |
| 264 | <p> |
Jeffrey Yasskin | bec4877 | 2010-01-28 01:14:43 +0000 | [diff] [blame] | 265 | The LLVM Machine Code (MC) Toolkit project is ... |
Chris Lattner | 61358ab | 2009-10-13 17:48:04 +0000 | [diff] [blame] | 266 | </p> |
| 267 | |
| 268 | </div> |
| 269 | |
| 270 | |
Chris Lattner | ab68e9e | 2009-02-26 22:33:38 +0000 | [diff] [blame] | 271 | <!-- *********************************************************************** --> |
| 272 | <div class="doc_section"> |
Jeffrey Yasskin | bec4877 | 2010-01-28 01:14:43 +0000 | [diff] [blame] | 273 | <a name="externalproj">External Open Source Projects Using LLVM 2.7</a> |
Chris Lattner | ab68e9e | 2009-02-26 22:33:38 +0000 | [diff] [blame] | 274 | </div> |
| 275 | <!-- *********************************************************************** --> |
| 276 | |
Chris Lattner | 61358ab | 2009-10-13 17:48:04 +0000 | [diff] [blame] | 277 | <div class="doc_text"> |
| 278 | |
| 279 | <p>An exciting aspect of LLVM is that it is used as an enabling technology for |
| 280 | a lot of other language and tools projects. This section lists some of the |
Jeffrey Yasskin | bec4877 | 2010-01-28 01:14:43 +0000 | [diff] [blame] | 281 | projects that have already been updated to work with LLVM 2.7.</p> |
Chris Lattner | 61358ab | 2009-10-13 17:48:04 +0000 | [diff] [blame] | 282 | </div> |
| 283 | |
| 284 | |
| 285 | <!--=========================================================================--> |
| 286 | <div class="doc_subsection"> |
| 287 | <a name="Rubinius">Rubinius</a> |
| 288 | </div> |
| 289 | |
| 290 | <div class="doc_text"> |
Chris Lattner | 0e464a9 | 2010-03-17 04:02:39 +0000 | [diff] [blame] | 291 | Need update. |
| 292 | <!-- |
Chris Lattner | 61358ab | 2009-10-13 17:48:04 +0000 | [diff] [blame] | 293 | <p><a href="http://github.com/evanphx/rubinius">Rubinius</a> is an environment |
| 294 | for running Ruby code which strives to write as much of the core class |
| 295 | implementation in Ruby as possible. Combined with a bytecode interpreting VM, it |
| 296 | uses LLVM to optimize and compile ruby code down to machine code. Techniques |
| 297 | such as type feedback, method inlining, and uncommon traps are all used to |
| 298 | remove dynamism from ruby execution and increase performance.</p> |
| 299 | |
| 300 | <p>Since LLVM 2.5, Rubinius has made several major leaps forward, implementing |
| 301 | a counter based JIT, type feedback and speculative method inlining. |
Chris Lattner | 0e464a9 | 2010-03-17 04:02:39 +0000 | [diff] [blame] | 302 | --> |
Chris Lattner | 61358ab | 2009-10-13 17:48:04 +0000 | [diff] [blame] | 303 | </p> |
| 304 | |
| 305 | </div> |
| 306 | |
| 307 | <!--=========================================================================--> |
| 308 | <div class="doc_subsection"> |
| 309 | <a name="macruby">MacRuby</a> |
| 310 | </div> |
| 311 | |
| 312 | <div class="doc_text"> |
| 313 | |
| 314 | <p> |
Chris Lattner | 0e464a9 | 2010-03-17 04:02:39 +0000 | [diff] [blame] | 315 | Need update. |
| 316 | <!-- |
Chris Lattner | 61358ab | 2009-10-13 17:48:04 +0000 | [diff] [blame] | 317 | <a href="http://macruby.org">MacRuby</a> is an implementation of Ruby on top of |
| 318 | core Mac OS X technologies, such as the Objective-C common runtime and garbage |
| 319 | collector and the CoreFoundation framework. It is principally developed by |
| 320 | Apple and aims at enabling the creation of full-fledged Mac OS X applications. |
| 321 | </p> |
| 322 | |
| 323 | <p> |
| 324 | MacRuby uses LLVM for optimization passes, JIT and AOT compilation of Ruby |
| 325 | expressions. It also uses zero-cost DWARF exceptions to implement Ruby exception |
Chris Lattner | 0e464a9 | 2010-03-17 04:02:39 +0000 | [diff] [blame] | 326 | handling.--> </p> |
Chris Lattner | 61358ab | 2009-10-13 17:48:04 +0000 | [diff] [blame] | 327 | |
| 328 | </div> |
| 329 | |
| 330 | |
Chris Lattner | ab68e9e | 2009-02-26 22:33:38 +0000 | [diff] [blame] | 331 | <!--=========================================================================--> |
| 332 | <div class="doc_subsection"> |
| 333 | <a name="pure">Pure</a> |
| 334 | </div> |
| 335 | |
| 336 | <div class="doc_text"> |
| 337 | <p> |
Chris Lattner | 917cc71 | 2009-03-02 02:37:32 +0000 | [diff] [blame] | 338 | <a href="http://pure-lang.googlecode.com/">Pure</a> |
| 339 | is an algebraic/functional programming language based on term rewriting. |
Chris Lattner | ab68e9e | 2009-02-26 22:33:38 +0000 | [diff] [blame] | 340 | Programs are collections of equations which are used to evaluate expressions in |
| 341 | a symbolic fashion. Pure offers dynamic typing, eager and lazy evaluation, |
Mikhail Glushenkov | f795ef0 | 2009-03-01 18:09:47 +0000 | [diff] [blame] | 342 | lexical closures, a hygienic macro system (also based on term rewriting), |
Chris Lattner | ab68e9e | 2009-02-26 22:33:38 +0000 | [diff] [blame] | 343 | built-in list and matrix support (including list and matrix comprehensions) and |
| 344 | an easy-to-use C interface. The interpreter uses LLVM as a backend to |
| 345 | JIT-compile Pure programs to fast native code.</p> |
| 346 | |
Chris Lattner | 477a1fd | 2010-03-17 17:25:49 +0000 | [diff] [blame] | 347 | <p>Pure versions 0.43 and later have been tested and are known to work with |
| 348 | LLVM 2.7 (and continue to work with older LLVM releases >= 2.5).</p> |
| 349 | |
Chris Lattner | ab68e9e | 2009-02-26 22:33:38 +0000 | [diff] [blame] | 350 | </div> |
| 351 | |
| 352 | |
| 353 | <!--=========================================================================--> |
| 354 | <div class="doc_subsection"> |
| 355 | <a name="ldc">LLVM D Compiler</a> |
| 356 | </div> |
| 357 | |
| 358 | <div class="doc_text"> |
| 359 | <p> |
Chris Lattner | 0e464a9 | 2010-03-17 04:02:39 +0000 | [diff] [blame] | 360 | Need update. |
| 361 | <!-- |
Chris Lattner | 917cc71 | 2009-03-02 02:37:32 +0000 | [diff] [blame] | 362 | <a href="http://www.dsource.org/projects/ldc">LDC</a> is an implementation of |
| 363 | the D Programming Language using the LLVM optimizer and code generator. |
Chris Lattner | 61358ab | 2009-10-13 17:48:04 +0000 | [diff] [blame] | 364 | The LDC project works great with the LLVM 2.6 release. General improvements in |
John Criswell | 524a5dd | 2009-03-02 15:28:15 +0000 | [diff] [blame] | 365 | this |
Chris Lattner | 917cc71 | 2009-03-02 02:37:32 +0000 | [diff] [blame] | 366 | cycle have included new inline asm constraint handling, better debug info |
Chris Lattner | 61358ab | 2009-10-13 17:48:04 +0000 | [diff] [blame] | 367 | support, general bug fixes and better x86-64 support. This has allowed |
| 368 | some major improvements in LDC, getting it much closer to being as |
Chris Lattner | 0e464a9 | 2010-03-17 04:02:39 +0000 | [diff] [blame] | 369 | fully featured as the original DMD compiler from DigitalMars.--> |
Chris Lattner | ab68e9e | 2009-02-26 22:33:38 +0000 | [diff] [blame] | 370 | </p> |
| 371 | </div> |
| 372 | |
Chris Lattner | bc31caf | 2009-02-28 18:58:01 +0000 | [diff] [blame] | 373 | <!--=========================================================================--> |
| 374 | <div class="doc_subsection"> |
| 375 | <a name="RoadsendPHP">Roadsend PHP</a> |
| 376 | </div> |
| 377 | |
| 378 | <div class="doc_text"> |
Chris Lattner | 61358ab | 2009-10-13 17:48:04 +0000 | [diff] [blame] | 379 | <p> |
| 380 | <a href="http://code.roadsend.com/rphp">Roadsend PHP</a> (rphp) is an open |
Chris Lattner | cade822 | 2009-03-02 19:07:24 +0000 | [diff] [blame] | 381 | source implementation of the PHP programming |
Chris Lattner | 61358ab | 2009-10-13 17:48:04 +0000 | [diff] [blame] | 382 | language that uses LLVM for its optimizer, JIT and static compiler. This is a |
Chris Lattner | 0e464a9 | 2010-03-17 04:02:39 +0000 | [diff] [blame] | 383 | reimplementation of an earlier project that is now based on LLVM. |
Chris Lattner | 477a1fd | 2010-03-17 17:25:49 +0000 | [diff] [blame] | 384 | </p> |
Chris Lattner | bc31caf | 2009-02-28 18:58:01 +0000 | [diff] [blame] | 385 | </div> |
Chris Lattner | ab68e9e | 2009-02-26 22:33:38 +0000 | [diff] [blame] | 386 | |
Chris Lattner | 61358ab | 2009-10-13 17:48:04 +0000 | [diff] [blame] | 387 | <!--=========================================================================--> |
| 388 | <div class="doc_subsection"> |
| 389 | <a name="UnladenSwallow">Unladen Swallow</a> |
| 390 | </div> |
| 391 | |
| 392 | <div class="doc_text"> |
| 393 | <p> |
| 394 | <a href="http://code.google.com/p/unladen-swallow/">Unladen Swallow</a> is a |
| 395 | branch of <a href="http://python.org/">Python</a> intended to be fully |
| 396 | compatible and significantly faster. It uses LLVM's optimization passes and JIT |
Chris Lattner | b5f6feb | 2010-03-18 06:52:15 +0000 | [diff] [blame] | 397 | compiler. |
Chris Lattner | 0e464a9 | 2010-03-17 04:02:39 +0000 | [diff] [blame] | 398 | </p> |
Chris Lattner | 61358ab | 2009-10-13 17:48:04 +0000 | [diff] [blame] | 399 | </div> |
| 400 | |
| 401 | <!--=========================================================================--> |
| 402 | <div class="doc_subsection"> |
| 403 | <a name="llvm-lua">llvm-lua</a> |
| 404 | </div> |
| 405 | |
| 406 | <div class="doc_text"> |
| 407 | <p> |
Chris Lattner | 0e464a9 | 2010-03-17 04:02:39 +0000 | [diff] [blame] | 408 | Need update. |
| 409 | <!-- |
Chris Lattner | 61358ab | 2009-10-13 17:48:04 +0000 | [diff] [blame] | 410 | <a href="http://code.google.com/p/llvm-lua/">LLVM-Lua</a> uses LLVM to add JIT |
| 411 | and static compiling support to the Lua VM. Lua bytecode is analyzed to |
| 412 | remove type checks, then LLVM is used to compile the bytecode down to machine |
Chris Lattner | 0e464a9 | 2010-03-17 04:02:39 +0000 | [diff] [blame] | 413 | code.--> |
| 414 | </p> |
Chris Lattner | 61358ab | 2009-10-13 17:48:04 +0000 | [diff] [blame] | 415 | </div> |
| 416 | |
| 417 | <!--=========================================================================--> |
| 418 | <div class="doc_subsection"> |
| 419 | <a name="icedtea">IcedTea Java Virtual Machine Implementation</a> |
| 420 | </div> |
| 421 | |
| 422 | <div class="doc_text"> |
| 423 | <p> |
Chris Lattner | 0e464a9 | 2010-03-17 04:02:39 +0000 | [diff] [blame] | 424 | Need update. |
| 425 | <!-- |
Chris Lattner | 61358ab | 2009-10-13 17:48:04 +0000 | [diff] [blame] | 426 | <a href="http://icedtea.classpath.org/wiki/Main_Page">IcedTea</a> provides a |
| 427 | harness to build OpenJDK using only free software build tools and to provide |
| 428 | replacements for the not-yet free parts of OpenJDK. One of the extensions that |
| 429 | IcedTea provides is a new JIT compiler named <a |
| 430 | href="http://icedtea.classpath.org/wiki/ZeroSharkFaq">Shark</a> which uses LLVM |
| 431 | to provide native code generation without introducing processor-dependent |
Chris Lattner | 0e464a9 | 2010-03-17 04:02:39 +0000 | [diff] [blame] | 432 | code.--> |
Chris Lattner | 61358ab | 2009-10-13 17:48:04 +0000 | [diff] [blame] | 433 | </p> |
| 434 | </div> |
| 435 | |
| 436 | |
Chris Lattner | 8d4bbbe | 2010-03-29 17:50:39 +0000 | [diff] [blame] | 437 | <!--=========================================================================--> |
| 438 | <div class="doc_subsection"> |
| 439 | <a name="tce">TTA-based Codesign Environment (TCE)</a> |
| 440 | </div> |
| 441 | |
| 442 | <div class="doc_text"> |
| 443 | <p> |
| 444 | <a href="http://tce.cs.tut.fi/">TCE</a> is a toolset for designing |
| 445 | application-specific processors (ASP) based on the Transport triggered |
| 446 | architecture (TTA). The toolset provides a complete co-design flow from C/C++ |
| 447 | programs down to synthesizable VHDL and parallel program binaries. Processor |
| 448 | customization points include the register files, function units, supported |
| 449 | operations, and the interconnection network.</p> |
| 450 | |
| 451 | <p>TCE uses llvm-gcc/Clang and LLVM for C/C++ language support, target |
| 452 | independent optimizations and also for parts of code generation. It generates |
| 453 | new LLVM-based code generators "on the fly" for the designed TTA processors and |
| 454 | loads them in to the compiler backend as runtime libraries to avoid per-target |
| 455 | recompilation of larger parts of the compiler chain.</p> |
| 456 | |
| 457 | </div> |
Chris Lattner | 8348b47 | 2008-06-08 21:58:17 +0000 | [diff] [blame] | 458 | |
| 459 | <!-- *********************************************************************** --> |
| 460 | <div class="doc_section"> |
Jeffrey Yasskin | bec4877 | 2010-01-28 01:14:43 +0000 | [diff] [blame] | 461 | <a name="whatsnew">What's New in LLVM 2.7?</a> |
Chris Lattner | 8348b47 | 2008-06-08 21:58:17 +0000 | [diff] [blame] | 462 | </div> |
| 463 | <!-- *********************************************************************** --> |
| 464 | |
Chris Lattner | f8e0b4e | 2008-06-08 22:59:35 +0000 | [diff] [blame] | 465 | <div class="doc_text"> |
| 466 | |
Chris Lattner | 61358ab | 2009-10-13 17:48:04 +0000 | [diff] [blame] | 467 | <p>This release includes a huge number of bug fixes, performance tweaks and |
Chris Lattner | f6662f9 | 2008-10-13 17:57:36 +0000 | [diff] [blame] | 468 | minor improvements. Some of the major improvements and new features are listed |
| 469 | in this section. |
Chris Lattner | f8e0b4e | 2008-06-08 22:59:35 +0000 | [diff] [blame] | 470 | </p> |
Chris Lattner | 61358ab | 2009-10-13 17:48:04 +0000 | [diff] [blame] | 471 | |
Chris Lattner | f8e0b4e | 2008-06-08 22:59:35 +0000 | [diff] [blame] | 472 | </div> |
| 473 | |
Chris Lattner | 8348b47 | 2008-06-08 21:58:17 +0000 | [diff] [blame] | 474 | <!--=========================================================================--> |
Chris Lattner | ea34f64 | 2008-06-08 21:34:41 +0000 | [diff] [blame] | 475 | <div class="doc_subsection"> |
Chris Lattner | 252b83d | 2008-02-06 18:00:06 +0000 | [diff] [blame] | 476 | <a name="majorfeatures">Major New Features</a> |
| 477 | </div> |
| 478 | |
| 479 | <div class="doc_text"> |
| 480 | |
Jeffrey Yasskin | bec4877 | 2010-01-28 01:14:43 +0000 | [diff] [blame] | 481 | <p>LLVM 2.7 includes several major new capabilities:</p> |
Chris Lattner | f3e5bc6 | 2007-05-14 06:56:09 +0000 | [diff] [blame] | 482 | |
| 483 | <ul> |
Jeffrey Yasskin | bec4877 | 2010-01-28 01:14:43 +0000 | [diff] [blame] | 484 | <li>...</li> |
Chris Lattner | 8170c10 | 2008-02-10 08:18:42 +0000 | [diff] [blame] | 485 | </ul> |
| 486 | |
Chris Lattner | c66bfef | 2010-03-17 04:41:49 +0000 | [diff] [blame] | 487 | Extensible metadata solid. |
| 488 | |
| 489 | Debug info improvements: using metadata instead of llvm.dbg global variables. |
| 490 | This brings several enhancements including improved compile times. |
| 491 | |
| 492 | New instruction selector. |
| 493 | GHC Haskell ABI/ calling conv support. |
| 494 | Pre-Alpha support for unions in IR. |
| 495 | New InlineHint and StackAlignment function attributes |
| 496 | Code generator MC'ized except for debug info and EH. |
| 497 | New SCEV AA pass: -scev-aa |
| 498 | Inliner reuses arrays allocas when inlining multiple callers to reduce stack usage. |
| 499 | MC encoding and disassembler apis. |
| 500 | Optimal Edge Profiling? |
| 501 | Instcombine is now a library, has its own IRBuilder to simplify itself. |
| 502 | New llvm/Support/Regex.h API. FileCheck now does regex's |
Chris Lattner | dc91008 | 2010-03-17 06:41:58 +0000 | [diff] [blame] | 503 | Many subtle pointer invalidation bugs in Callgraph have been fixed and it now uses asserting value handles. |
| 504 | MC Disassembler (with blog post), MCInstPrinter. Many X86 backend and AsmPrinter simplifications |
| 505 | Various tools like llc and opt now read either .ll or .bc files as input. |
Chris Lattner | 8e7f1b1 | 2010-03-29 18:42:42 +0000 | [diff] [blame] | 506 | Malloc and free instructions got removed, along with LowerAllocations pass. |
Chris Lattner | dc91008 | 2010-03-17 06:41:58 +0000 | [diff] [blame] | 507 | compiler-rt support for ARM. |
| 508 | completely llvm-gcc NEON support. |
| 509 | Can transcode from GAS to intel syntax with "llvm-mc foo.s -output-asm-variant=1" |
| 510 | JIT debug information with GDB 7.0 |
Chris Lattner | f04bdc5 | 2010-03-17 18:15:52 +0000 | [diff] [blame] | 511 | New CodeGen Level CSE |
Chris Lattner | dc91008 | 2010-03-17 06:41:58 +0000 | [diff] [blame] | 512 | CMake can now run tests, what other improvements? |
Chris Lattner | f04bdc5 | 2010-03-17 18:15:52 +0000 | [diff] [blame] | 513 | ARM/Thumb using reg scavenging for stack object address materialization (PEI). |
Chris Lattner | dc91008 | 2010-03-17 06:41:58 +0000 | [diff] [blame] | 514 | New SSAUpdater and MachineSSAUpdater classes for unstructured ssa updating, |
| 515 | changed jump threading, GVN, etc to use it which simplified them and speed |
| 516 | them up. |
Chris Lattner | 15a0611 | 2010-03-17 06:42:25 +0000 | [diff] [blame] | 517 | Combiner-AA improvements, why not on by default? |
Chris Lattner | f04bdc5 | 2010-03-17 18:15:52 +0000 | [diff] [blame] | 518 | Pre-regalloc tail duplication |
| 519 | x86 sibcall optimization |
| 520 | New LSR with full strength reduction mode |
| 521 | The most awesome sext / zext optimization pass. ? |
| 522 | |
Chris Lattner | b22060d | 2010-03-29 18:39:28 +0000 | [diff] [blame] | 523 | The ARM backend now has good support for ARMv4 backend (tested on StrongARM |
| 524 | hardware), previously only supported ARMv4T and newer. |
| 525 | |
Chris Lattner | f04bdc5 | 2010-03-17 18:15:52 +0000 | [diff] [blame] | 526 | |
Chris Lattner | c66bfef | 2010-03-17 04:41:49 +0000 | [diff] [blame] | 527 | |
Chris Lattner | 8e7f1b1 | 2010-03-29 18:42:42 +0000 | [diff] [blame] | 528 | Defaults to RTTI off, packagers should build with make REQUIRE_RTTI=1. |
Chris Lattner | dc91008 | 2010-03-17 06:41:58 +0000 | [diff] [blame] | 529 | CondProp pass removed (functionality merged into jump threading). |
Chris Lattner | c66bfef | 2010-03-17 04:41:49 +0000 | [diff] [blame] | 530 | AndersAA got removed (from 2.7 or mainline?) |
Chris Lattner | dc91008 | 2010-03-17 06:41:58 +0000 | [diff] [blame] | 531 | PredSimplify, LoopVR, GVNPRE got removed. |
Chris Lattner | c66bfef | 2010-03-17 04:41:49 +0000 | [diff] [blame] | 532 | LLVM command line tools now overwrite their output, before they would only do this with -f. |
| 533 | DOUT removed, use DEBUG(errs() instead. |
| 534 | Much stuff converted to use raw_ostream instead of std::ostream. |
| 535 | TargetAsmInfo renamed to MCAsmInfo |
| 536 | llvm/ADT/iterator.h gone. |
| 537 | |
Chris Lattner | dc91008 | 2010-03-17 06:41:58 +0000 | [diff] [blame] | 538 | |
Chris Lattner | f3e5bc6 | 2007-05-14 06:56:09 +0000 | [diff] [blame] | 539 | </div> |
| 540 | |
Chris Lattner | 8497764 | 2007-09-21 03:54:09 +0000 | [diff] [blame] | 541 | <!--=========================================================================--> |
| 542 | <div class="doc_subsection"> |
Chris Lattner | 917cc71 | 2009-03-02 02:37:32 +0000 | [diff] [blame] | 543 | <a name="coreimprovements">LLVM IR and Core Improvements</a> |
Chris Lattner | f304ffc | 2008-02-10 08:17:19 +0000 | [diff] [blame] | 544 | </div> |
| 545 | |
| 546 | <div class="doc_text"> |
Chris Lattner | 61358ab | 2009-10-13 17:48:04 +0000 | [diff] [blame] | 547 | <p>LLVM IR has several new features for better support of new targets and that |
| 548 | expose new optimization opportunities:</p> |
Chris Lattner | f304ffc | 2008-02-10 08:17:19 +0000 | [diff] [blame] | 549 | |
Chris Lattner | 791f77b | 2008-06-05 06:25:56 +0000 | [diff] [blame] | 550 | <ul> |
Jeffrey Yasskin | bec4877 | 2010-01-28 01:14:43 +0000 | [diff] [blame] | 551 | <li>...</li> |
Chris Lattner | f304ffc | 2008-02-10 08:17:19 +0000 | [diff] [blame] | 552 | </ul> |
Mikhail Glushenkov | ea65d7d | 2008-10-13 02:08:34 +0000 | [diff] [blame] | 553 | |
Chris Lattner | f304ffc | 2008-02-10 08:17:19 +0000 | [diff] [blame] | 554 | </div> |
| 555 | |
| 556 | <!--=========================================================================--> |
| 557 | <div class="doc_subsection"> |
Chris Lattner | acce85d | 2008-02-10 07:46:44 +0000 | [diff] [blame] | 558 | <a name="optimizer">Optimizer Improvements</a> |
| 559 | </div> |
| 560 | |
| 561 | <div class="doc_text"> |
| 562 | |
Chris Lattner | 61358ab | 2009-10-13 17:48:04 +0000 | [diff] [blame] | 563 | <p>In addition to a large array of minor performance tweaks and bug fixes, this |
Chris Lattner | f301387 | 2008-10-13 21:50:36 +0000 | [diff] [blame] | 564 | release includes a few major enhancements and additions to the optimizers:</p> |
Chris Lattner | acce85d | 2008-02-10 07:46:44 +0000 | [diff] [blame] | 565 | |
| 566 | <ul> |
| 567 | |
Jeffrey Yasskin | bec4877 | 2010-01-28 01:14:43 +0000 | [diff] [blame] | 568 | <li>...</li> |
Chris Lattner | 917cc71 | 2009-03-02 02:37:32 +0000 | [diff] [blame] | 569 | |
Chris Lattner | 61358ab | 2009-10-13 17:48:04 +0000 | [diff] [blame] | 570 | </ul> |
Chris Lattner | 917cc71 | 2009-03-02 02:37:32 +0000 | [diff] [blame] | 571 | |
Chris Lattner | f220191 | 2010-03-01 19:29:17 +0000 | [diff] [blame] | 572 | <p>Also, -anders-aa was removed</p> |
| 573 | |
Chris Lattner | 61358ab | 2009-10-13 17:48:04 +0000 | [diff] [blame] | 574 | </div> |
Chris Lattner | 917cc71 | 2009-03-02 02:37:32 +0000 | [diff] [blame] | 575 | |
Chris Lattner | 917cc71 | 2009-03-02 02:37:32 +0000 | [diff] [blame] | 576 | |
Chris Lattner | 61358ab | 2009-10-13 17:48:04 +0000 | [diff] [blame] | 577 | <!--=========================================================================--> |
| 578 | <div class="doc_subsection"> |
| 579 | <a name="executionengine">Interpreter and JIT Improvements</a> |
| 580 | </div> |
Chris Lattner | f301387 | 2008-10-13 21:50:36 +0000 | [diff] [blame] | 581 | |
Chris Lattner | 61358ab | 2009-10-13 17:48:04 +0000 | [diff] [blame] | 582 | <div class="doc_text"> |
| 583 | |
| 584 | <ul> |
Jeffrey Yasskin | 01eba39 | 2010-01-29 19:10:38 +0000 | [diff] [blame] | 585 | <li>The JIT now <a |
| 586 | href="http://llvm.org/viewvc/llvm-project?view=rev&revision=85295">defaults |
| 587 | to compiling eagerly</a> to avoid a race condition in the lazy JIT. |
| 588 | Clients that still want the lazy JIT can switch it on by calling |
| 589 | <tt>ExecutionEngine::DisableLazyCompilation(false)</tt>.</li> |
Jeffrey Yasskin | 40966a7 | 2010-02-11 01:07:39 +0000 | [diff] [blame] | 590 | <li>It is now possible to create more than one JIT instance in the same process. |
| 591 | These JITs can generate machine code in parallel, |
| 592 | although <a href="http://llvm.org/docs/ProgrammersManual.html#jitthreading">you |
| 593 | still have to obey the other threading restrictions</a>.</li> |
Chris Lattner | 0b83220 | 2008-06-08 02:45:07 +0000 | [diff] [blame] | 594 | </ul> |
| 595 | |
| 596 | </div> |
| 597 | |
| 598 | <!--=========================================================================--> |
| 599 | <div class="doc_subsection"> |
Chris Lattner | 511433e | 2009-03-02 03:24:11 +0000 | [diff] [blame] | 600 | <a name="codegen">Target Independent Code Generator Improvements</a> |
Chris Lattner | 0b83220 | 2008-06-08 02:45:07 +0000 | [diff] [blame] | 601 | </div> |
| 602 | |
| 603 | <div class="doc_text"> |
| 604 | |
Mikhail Glushenkov | f795ef0 | 2009-03-01 18:09:47 +0000 | [diff] [blame] | 605 | <p>We have put a significant amount of work into the code generator |
| 606 | infrastructure, which allows us to implement more aggressive algorithms and make |
| 607 | it run faster:</p> |
Chris Lattner | 0b83220 | 2008-06-08 02:45:07 +0000 | [diff] [blame] | 608 | |
| 609 | <ul> |
Chris Lattner | 511433e | 2009-03-02 03:24:11 +0000 | [diff] [blame] | 610 | |
Jeffrey Yasskin | bec4877 | 2010-01-28 01:14:43 +0000 | [diff] [blame] | 611 | <li>...</li> |
Chris Lattner | 8497764 | 2007-09-21 03:54:09 +0000 | [diff] [blame] | 612 | </ul> |
Chris Lattner | 8497764 | 2007-09-21 03:54:09 +0000 | [diff] [blame] | 613 | </div> |
| 614 | |
Chris Lattner | 917cc71 | 2009-03-02 02:37:32 +0000 | [diff] [blame] | 615 | <!--=========================================================================--> |
| 616 | <div class="doc_subsection"> |
| 617 | <a name="x86">X86-32 and X86-64 Target Improvements</a> |
| 618 | </div> |
| 619 | |
| 620 | <div class="doc_text"> |
| 621 | <p>New features of the X86 target include: |
| 622 | </p> |
| 623 | |
| 624 | <ul> |
Chris Lattner | 511433e | 2009-03-02 03:24:11 +0000 | [diff] [blame] | 625 | |
Jeffrey Yasskin | bec4877 | 2010-01-28 01:14:43 +0000 | [diff] [blame] | 626 | <li>...</li> |
Chris Lattner | 511433e | 2009-03-02 03:24:11 +0000 | [diff] [blame] | 627 | |
Chris Lattner | 917cc71 | 2009-03-02 02:37:32 +0000 | [diff] [blame] | 628 | </ul> |
| 629 | |
Chris Lattner | 917cc71 | 2009-03-02 02:37:32 +0000 | [diff] [blame] | 630 | </div> |
Chris Lattner | 8497764 | 2007-09-21 03:54:09 +0000 | [diff] [blame] | 631 | |
| 632 | <!--=========================================================================--> |
| 633 | <div class="doc_subsection"> |
Chris Lattner | 1139899 | 2009-02-26 07:32:11 +0000 | [diff] [blame] | 634 | <a name="pic16">PIC16 Target Improvements</a> |
| 635 | </div> |
| 636 | |
| 637 | <div class="doc_text"> |
| 638 | <p>New features of the PIC16 target include: |
| 639 | </p> |
| 640 | |
| 641 | <ul> |
Jeffrey Yasskin | bec4877 | 2010-01-28 01:14:43 +0000 | [diff] [blame] | 642 | <li>...</li> |
Chris Lattner | 1139899 | 2009-02-26 07:32:11 +0000 | [diff] [blame] | 643 | </ul> |
| 644 | |
| 645 | <p>Things not yet supported:</p> |
| 646 | |
| 647 | <ul> |
Chris Lattner | 1139899 | 2009-02-26 07:32:11 +0000 | [diff] [blame] | 648 | <li>Variable arguments.</li> |
Chris Lattner | 511433e | 2009-03-02 03:24:11 +0000 | [diff] [blame] | 649 | <li>Interrupts/programs.</li> |
Chris Lattner | 1139899 | 2009-02-26 07:32:11 +0000 | [diff] [blame] | 650 | </ul> |
| 651 | |
| 652 | </div> |
| 653 | |
Chris Lattner | 1139899 | 2009-02-26 07:32:11 +0000 | [diff] [blame] | 654 | <!--=========================================================================--> |
| 655 | <div class="doc_subsection"> |
Chris Lattner | 61358ab | 2009-10-13 17:48:04 +0000 | [diff] [blame] | 656 | <a name="ARM">ARM Target Improvements</a> |
Chris Lattner | c441fb8 | 2009-03-01 02:30:21 +0000 | [diff] [blame] | 657 | </div> |
| 658 | |
| 659 | <div class="doc_text"> |
Chris Lattner | 61358ab | 2009-10-13 17:48:04 +0000 | [diff] [blame] | 660 | <p>New features of the ARM target include: |
| 661 | </p> |
Chris Lattner | c441fb8 | 2009-03-01 02:30:21 +0000 | [diff] [blame] | 662 | |
| 663 | <ul> |
Chris Lattner | c441fb8 | 2009-03-01 02:30:21 +0000 | [diff] [blame] | 664 | |
Jeffrey Yasskin | bec4877 | 2010-01-28 01:14:43 +0000 | [diff] [blame] | 665 | <li>...</li> |
Chris Lattner | 61358ab | 2009-10-13 17:48:04 +0000 | [diff] [blame] | 666 | </ul> |
Chris Lattner | c441fb8 | 2009-03-01 02:30:21 +0000 | [diff] [blame] | 667 | |
Chris Lattner | c441fb8 | 2009-03-01 02:30:21 +0000 | [diff] [blame] | 668 | |
Chris Lattner | 61358ab | 2009-10-13 17:48:04 +0000 | [diff] [blame] | 669 | </div> |
Chris Lattner | c441fb8 | 2009-03-01 02:30:21 +0000 | [diff] [blame] | 670 | |
Chris Lattner | 61358ab | 2009-10-13 17:48:04 +0000 | [diff] [blame] | 671 | <!--=========================================================================--> |
| 672 | <div class="doc_subsection"> |
| 673 | <a name="OtherTarget">Other Target Specific Improvements</a> |
| 674 | </div> |
Chris Lattner | c441fb8 | 2009-03-01 02:30:21 +0000 | [diff] [blame] | 675 | |
Chris Lattner | 61358ab | 2009-10-13 17:48:04 +0000 | [diff] [blame] | 676 | <div class="doc_text"> |
| 677 | <p>New features of other targets include: |
| 678 | </p> |
| 679 | |
| 680 | <ul> |
Jeffrey Yasskin | bec4877 | 2010-01-28 01:14:43 +0000 | [diff] [blame] | 681 | <li>...</li> |
Chris Lattner | 61358ab | 2009-10-13 17:48:04 +0000 | [diff] [blame] | 682 | </ul> |
| 683 | |
| 684 | </div> |
| 685 | |
| 686 | <!--=========================================================================--> |
| 687 | <div class="doc_subsection"> |
| 688 | <a name="newapis">New Useful APIs</a> |
| 689 | </div> |
| 690 | |
| 691 | <div class="doc_text"> |
| 692 | |
| 693 | <p>This release includes a number of new APIs that are used internally, which |
| 694 | may also be useful for external clients. |
| 695 | </p> |
| 696 | |
| 697 | <ul> |
Jeffrey Yasskin | bec4877 | 2010-01-28 01:14:43 +0000 | [diff] [blame] | 698 | <li>...</li> |
Chris Lattner | 61358ab | 2009-10-13 17:48:04 +0000 | [diff] [blame] | 699 | </ul> |
| 700 | |
| 701 | |
| 702 | </div> |
| 703 | |
| 704 | <!--=========================================================================--> |
| 705 | <div class="doc_subsection"> |
| 706 | <a name="otherimprovements">Other Improvements and New Features</a> |
| 707 | </div> |
| 708 | |
| 709 | <div class="doc_text"> |
| 710 | <p>Other miscellaneous features include:</p> |
| 711 | |
| 712 | <ul> |
Jeffrey Yasskin | bec4877 | 2010-01-28 01:14:43 +0000 | [diff] [blame] | 713 | <li>...</li> |
Chris Lattner | c441fb8 | 2009-03-01 02:30:21 +0000 | [diff] [blame] | 714 | </ul> |
| 715 | |
| 716 | </div> |
| 717 | |
Chris Lattner | 77d29b1 | 2008-06-05 08:02:49 +0000 | [diff] [blame] | 718 | |
| 719 | <!--=========================================================================--> |
| 720 | <div class="doc_subsection"> |
Chris Lattner | f6662f9 | 2008-10-13 17:57:36 +0000 | [diff] [blame] | 721 | <a name="changes">Major Changes and Removed Features</a> |
| 722 | </div> |
| 723 | |
| 724 | <div class="doc_text"> |
| 725 | |
Chris Lattner | eeb4da0 | 2008-10-13 22:06:31 +0000 | [diff] [blame] | 726 | <p>If you're already an LLVM user or developer with out-of-tree changes based |
Jeffrey Yasskin | bec4877 | 2010-01-28 01:14:43 +0000 | [diff] [blame] | 727 | on LLVM 2.6, this section lists some "gotchas" that you may run into upgrading |
Chris Lattner | eeb4da0 | 2008-10-13 22:06:31 +0000 | [diff] [blame] | 728 | from the previous release.</p> |
Chris Lattner | f6662f9 | 2008-10-13 17:57:36 +0000 | [diff] [blame] | 729 | |
| 730 | <ul> |
Jeffrey Yasskin | bc83d06 | 2010-02-09 23:03:44 +0000 | [diff] [blame] | 731 | <li>The LLVM interpreter now defaults to <em>not</em> using <tt>libffi</tt> even |
| 732 | if you have it installed. This makes it more likely that an LLVM built on one |
| 733 | system will work when copied to a similar system. To use <tt>libffi</tt>, |
| 734 | configure with <tt>--enable-libffi</tt>. |
| 735 | </li> |
Chris Lattner | eeb4da0 | 2008-10-13 22:06:31 +0000 | [diff] [blame] | 736 | </ul> |
| 737 | |
| 738 | |
| 739 | <p>In addition, many APIs have changed in this release. Some of the major LLVM |
| 740 | API changes are:</p> |
| 741 | |
| 742 | <ul> |
Jeffrey Yasskin | 4fcd607 | 2010-01-28 01:41:20 +0000 | [diff] [blame] | 743 | <li><tt>ModuleProvider</tt> has been <a |
| 744 | href="http://llvm.org/viewvc/llvm-project?view=rev&revision=94686">removed</a> |
| 745 | and its methods moved to <tt>Module</tt> and <tt>GlobalValue</tt>. |
| 746 | Most clients can remove uses of <tt>ExistingModuleProvider</tt>, |
| 747 | replace <tt>getBitcodeModuleProvider</tt> with |
| 748 | <tt>getLazyBitcodeModule</tt>, and pass their <tt>Module</tt> to |
| 749 | functions that used to accept <tt>ModuleProvider</tt>. Clients who |
| 750 | wrote their own <tt>ModuleProvider</tt>s will need to derive from |
| 751 | <tt>GVMaterializer</tt> instead and use |
| 752 | <tt>Module::setMaterializer</tt> to attach it to a |
| 753 | <tt>Module</tt>.</li> |
| 754 | |
| 755 | <li><tt>GhostLinkage</tt> has given up the ghost. |
| 756 | <tt>GlobalValue</tt>s that have not yet been read from their backing |
| 757 | storage have the same linkage they will have after being read in. |
| 758 | Clients must replace calls to |
| 759 | <tt>GlobalValue::hasNotBeenReadFromBitcode</tt> with |
| 760 | <tt>GlobalValue::isMaterializable</tt>.</li> |
Daniel Dunbar | 4acdede | 2010-02-10 04:09:52 +0000 | [diff] [blame] | 761 | |
| 762 | <li>FIXME: Debug info has been totally redone. Add pointers to new APIs. Substantial caveats about compatibility of .ll and .bc files.</li> |
| 763 | |
Daniel Dunbar | ca1c816 | 2010-02-14 01:47:19 +0000 | [diff] [blame] | 764 | <li>The <tt>llvm/Support/DataTypes.h</tt> header has moved |
| 765 | to <tt>llvm/System/DataTypes.h</tt>.</li> |
| 766 | |
Duncan Sands | 411432d | 2010-02-17 17:20:17 +0000 | [diff] [blame] | 767 | <li>The <tt>isInteger</tt>, <tt>isIntOrIntVector</tt>, <tt>isFloatingPoint</tt>, |
| 768 | <tt>isFPOrFPVector</tt> and <tt>isFPOrFPVector</tt> methods have been renamed |
| 769 | <tt>isIntegerTy</tt>, <tt>isIntOrIntVectorTy</tt>, <tt>isFloatingPointTy</tt>, |
| 770 | <tt>isFPOrFPVectorTy</tt> and <tt>isFPOrFPVectorTy</tt> respectively.</li> |
Devang Patel | b34dd13 | 2008-10-14 20:03:43 +0000 | [diff] [blame] | 771 | </ul> |
Chris Lattner | f6662f9 | 2008-10-13 17:57:36 +0000 | [diff] [blame] | 772 | |
Chris Lattner | f6662f9 | 2008-10-13 17:57:36 +0000 | [diff] [blame] | 773 | </div> |
| 774 | |
| 775 | |
| 776 | |
Chris Lattner | 1909261 | 2003-10-02 16:38:05 +0000 | [diff] [blame] | 777 | <!-- *********************************************************************** --> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 778 | <div class="doc_section"> |
| 779 | <a name="portability">Portability and Supported Platforms</a> |
| 780 | </div> |
Chris Lattner | 1909261 | 2003-10-02 16:38:05 +0000 | [diff] [blame] | 781 | <!-- *********************************************************************** --> |
| 782 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 783 | <div class="doc_text"> |
| 784 | |
John Criswell | 0b5b5e9 | 2004-12-08 20:35:47 +0000 | [diff] [blame] | 785 | <p>LLVM is known to work on the following platforms:</p> |
Chris Lattner | 4654bdb | 2004-06-01 18:22:41 +0000 | [diff] [blame] | 786 | |
| 787 | <ul> |
Mikhail Glushenkov | f795ef0 | 2009-03-01 18:09:47 +0000 | [diff] [blame] | 788 | <li>Intel and AMD machines (IA32, X86-64, AMD64, EMT-64) running Red Hat |
Chris Lattner | 61358ab | 2009-10-13 17:48:04 +0000 | [diff] [blame] | 789 | Linux, Fedora Core, FreeBSD and AuroraUX (and probably other unix-like |
| 790 | systems).</li> |
Mikhail Glushenkov | f795ef0 | 2009-03-01 18:09:47 +0000 | [diff] [blame] | 791 | <li>PowerPC and X86-based Mac OS X systems, running 10.3 and above in 32-bit |
Chris Lattner | 61358ab | 2009-10-13 17:48:04 +0000 | [diff] [blame] | 792 | and 64-bit modes.</li> |
Chris Lattner | 252b83d | 2008-02-06 18:00:06 +0000 | [diff] [blame] | 793 | <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] | 794 | <li>Intel and AMD machines running on Win32 with the Cygwin libraries (limited |
| 795 | support is available for native builds with Visual C++).</li> |
Chris Lattner | 7e23d6e | 2009-10-16 16:30:58 +0000 | [diff] [blame] | 796 | <li>Sun x86 and AMD64 machines running Solaris 10, OpenSolaris 0906.</li> |
John Criswell | 9321fa8 | 2005-05-13 20:28:15 +0000 | [diff] [blame] | 797 | <li>Alpha-based machines running Debian GNU/Linux.</li> |
Chris Lattner | 4654bdb | 2004-06-01 18:22:41 +0000 | [diff] [blame] | 798 | </ul> |
| 799 | |
Chris Lattner | bc5786b | 2008-06-05 06:57:39 +0000 | [diff] [blame] | 800 | <p>The core LLVM infrastructure uses GNU autoconf to adapt itself |
Brian Gaeke | b0fd761 | 2004-05-09 05:28:35 +0000 | [diff] [blame] | 801 | to the machine and operating system on which it is built. However, minor |
| 802 | porting may be required to get LLVM to work on new platforms. We welcome your |
| 803 | portability patches and reports of successful builds or error messages.</p> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 804 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 805 | </div> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 806 | |
| 807 | <!-- *********************************************************************** --> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 808 | <div class="doc_section"> |
| 809 | <a name="knownproblems">Known Problems</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 | |
Mikhail Glushenkov | f795ef0 | 2009-03-01 18:09:47 +0000 | [diff] [blame] | 815 | <p>This section contains significant known problems with the LLVM system, |
Chris Lattner | e18b32e | 2008-11-10 05:40:34 +0000 | [diff] [blame] | 816 | listed by component. If you run into a problem, please check the <a |
Chris Lattner | c463b27 | 2005-10-29 07:07:09 +0000 | [diff] [blame] | 817 | 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] | 818 | there isn't already one.</p> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 819 | |
Chris Lattner | 477a1fd | 2010-03-17 17:25:49 +0000 | [diff] [blame] | 820 | <ul> |
Chris Lattner | 61358ab | 2009-10-13 17:48:04 +0000 | [diff] [blame] | 821 | <li>LLVM will not correctly compile on Solaris and/or OpenSolaris |
| 822 | using the stock GCC 3.x.x series 'out the box', |
Chris Lattner | 554ee4a | 2009-11-03 21:50:09 +0000 | [diff] [blame] | 823 | See: <a href="GettingStarted.html#brokengcc">Broken versions of GCC and other tools</a>. |
Chris Lattner | 61358ab | 2009-10-13 17:48:04 +0000 | [diff] [blame] | 824 | However, A <a href="http://pkg.auroraux.org/GCC">Modern GCC Build</a> |
| 825 | for x86/x86-64 has been made available from the third party AuroraUX Project |
| 826 | that has been meticulously tested for bootstrapping LLVM & Clang.</li> |
| 827 | </ul> |
| 828 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 829 | </div> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 830 | |
Chris Lattner | f5ee170 | 2004-03-14 02:03:02 +0000 | [diff] [blame] | 831 | <!-- ======================================================================= --> |
| 832 | <div class="doc_subsection"> |
| 833 | <a name="experimental">Experimental features included with this release</a> |
| 834 | </div> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 835 | |
Chris Lattner | f5ee170 | 2004-03-14 02:03:02 +0000 | [diff] [blame] | 836 | <div class="doc_text"> |
| 837 | |
Misha Brukman | 6df9e2c | 2004-05-12 21:46:05 +0000 | [diff] [blame] | 838 | <p>The following components of this LLVM release are either untested, known to |
| 839 | be broken or unreliable, or are in early development. These components should |
| 840 | not be relied on, and bugs should not be filed against them, but they may be |
| 841 | 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] | 842 | components, please contact us on the <a |
| 843 | 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] | 844 | |
| 845 | <ul> |
Wesley Peck | 7c4a121 | 2010-03-18 14:31:30 +0000 | [diff] [blame] | 846 | <li>The MSIL, Alpha, SPU, MIPS, PIC16, Blackfin, MSP430, SystemZ and MicroBlaze |
| 847 | backends are experimental.</li> |
Bill Wendling | 99dac47 | 2009-03-02 07:54:14 +0000 | [diff] [blame] | 848 | <li>The <tt>llc</tt> "<tt>-filetype=asm</tt>" (the default) is the only |
Chris Lattner | c66bfef | 2010-03-17 04:41:49 +0000 | [diff] [blame] | 849 | supported value for this option. The MachO writer is experimental, and |
| 850 | works much better in mainline SVN.</li> |
Chris Lattner | f5ee170 | 2004-03-14 02:03:02 +0000 | [diff] [blame] | 851 | </ul> |
| 852 | |
| 853 | </div> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 854 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 855 | <!-- ======================================================================= --> |
| 856 | <div class="doc_subsection"> |
Chris Lattner | 2629922 | 2006-11-18 07:51:14 +0000 | [diff] [blame] | 857 | <a name="x86-be">Known problems with the X86 back-end</a> |
John Criswell | c0c186d | 2005-11-08 21:11:33 +0000 | [diff] [blame] | 858 | </div> |
| 859 | |
| 860 | <div class="doc_text"> |
| 861 | |
| 862 | <ul> |
Anton Korobeynikov | a6094be | 2008-06-08 10:24:13 +0000 | [diff] [blame] | 863 | <li>The X86 backend does not yet support |
| 864 | all <a href="http://llvm.org/PR879">inline assembly that uses the X86 |
| 865 | floating point stack</a>. It supports the 'f' and 't' constraints, but not |
| 866 | 'u'.</li> |
Chris Lattner | e6e1b35 | 2008-06-08 21:19:07 +0000 | [diff] [blame] | 867 | <li>The X86 backend generates inefficient floating point code when configured |
| 868 | to generate code for systems that don't have SSE2.</li> |
Duncan Sands | 47eff2b | 2008-06-08 19:38:43 +0000 | [diff] [blame] | 869 | <li>Win64 code generation wasn't widely tested. Everything should work, but we |
John Criswell | 524a5dd | 2009-03-02 15:28:15 +0000 | [diff] [blame] | 870 | expect small issues to happen. Also, llvm-gcc cannot build the mingw64 |
| 871 | runtime currently due |
Anton Korobeynikov | a6094be | 2008-06-08 10:24:13 +0000 | [diff] [blame] | 872 | to <a href="http://llvm.org/PR2255">several</a> |
John Criswell | 524a5dd | 2009-03-02 15:28:15 +0000 | [diff] [blame] | 873 | <a href="http://llvm.org/PR2257">bugs</a> and due to lack of support for |
| 874 | the |
| 875 | 'u' inline assembly constraint and for X87 floating point inline assembly.</li> |
Dan Gohman | 8207ba9 | 2008-06-08 23:05:11 +0000 | [diff] [blame] | 876 | <li>The X86-64 backend does not yet support the LLVM IR instruction |
Chris Lattner | 917cc71 | 2009-03-02 02:37:32 +0000 | [diff] [blame] | 877 | <tt>va_arg</tt>. Currently, the llvm-gcc and front-ends support variadic |
Dan Gohman | 8207ba9 | 2008-06-08 23:05:11 +0000 | [diff] [blame] | 878 | argument constructs on X86-64 by lowering them manually.</li> |
Chris Lattner | 2629922 | 2006-11-18 07:51:14 +0000 | [diff] [blame] | 879 | </ul> |
| 880 | |
| 881 | </div> |
| 882 | |
| 883 | <!-- ======================================================================= --> |
| 884 | <div class="doc_subsection"> |
| 885 | <a name="ppc-be">Known problems with the PowerPC back-end</a> |
| 886 | </div> |
| 887 | |
| 888 | <div class="doc_text"> |
| 889 | |
| 890 | <ul> |
Nicolas Geoffray | e4285dc | 2007-05-15 09:21:28 +0000 | [diff] [blame] | 891 | <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] | 892 | compilation, and lacks support for debug information.</li> |
Chris Lattner | 2629922 | 2006-11-18 07:51:14 +0000 | [diff] [blame] | 893 | </ul> |
| 894 | |
| 895 | </div> |
| 896 | |
| 897 | <!-- ======================================================================= --> |
| 898 | <div class="doc_subsection"> |
Chris Lattner | f3e5bc6 | 2007-05-14 06:56:09 +0000 | [diff] [blame] | 899 | <a name="arm-be">Known problems with the ARM back-end</a> |
| 900 | </div> |
| 901 | |
| 902 | <div class="doc_text"> |
| 903 | |
| 904 | <ul> |
Chris Lattner | 61358ab | 2009-10-13 17:48:04 +0000 | [diff] [blame] | 905 | <li>Support for the Advanced SIMD (Neon) instruction set is still incomplete |
| 906 | and not well tested. Some features may not work at all, and the code quality |
| 907 | may be poor in some cases.</li> |
Chris Lattner | 57a460e | 2007-05-23 04:39:32 +0000 | [diff] [blame] | 908 | <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] | 909 | processors, thumb programs can crash or produce wrong |
Chris Lattner | 57a460e | 2007-05-23 04:39:32 +0000 | [diff] [blame] | 910 | results (<a href="http://llvm.org/PR1388">PR1388</a>).</li> |
John Criswell | 524a5dd | 2009-03-02 15:28:15 +0000 | [diff] [blame] | 911 | <li>Compilation for ARM Linux OABI (old ABI) is supported but not fully tested. |
Chris Lattner | f3e5bc6 | 2007-05-14 06:56:09 +0000 | [diff] [blame] | 912 | </li> |
Chris Lattner | f3e5bc6 | 2007-05-14 06:56:09 +0000 | [diff] [blame] | 913 | </ul> |
| 914 | |
| 915 | </div> |
| 916 | |
| 917 | <!-- ======================================================================= --> |
| 918 | <div class="doc_subsection"> |
Chris Lattner | 2629922 | 2006-11-18 07:51:14 +0000 | [diff] [blame] | 919 | <a name="sparc-be">Known problems with the SPARC back-end</a> |
| 920 | </div> |
| 921 | |
| 922 | <div class="doc_text"> |
| 923 | |
| 924 | <ul> |
John Criswell | 524a5dd | 2009-03-02 15:28:15 +0000 | [diff] [blame] | 925 | <li>The SPARC backend only supports the 32-bit SPARC ABI (-m32); it does not |
Chris Lattner | 2629922 | 2006-11-18 07:51:14 +0000 | [diff] [blame] | 926 | support the 64-bit SPARC ABI (-m64).</li> |
| 927 | </ul> |
| 928 | |
| 929 | </div> |
| 930 | |
| 931 | <!-- ======================================================================= --> |
| 932 | <div class="doc_subsection"> |
Bruno Cardoso Lopes | b7e1a4f | 2008-10-25 14:56:26 +0000 | [diff] [blame] | 933 | <a name="mips-be">Known problems with the MIPS back-end</a> |
| 934 | </div> |
| 935 | |
| 936 | <div class="doc_text"> |
| 937 | |
| 938 | <ul> |
Bruno Cardoso Lopes | b7e1a4f | 2008-10-25 14:56:26 +0000 | [diff] [blame] | 939 | <li>64-bit MIPS targets are not supported yet.</li> |
| 940 | </ul> |
| 941 | |
| 942 | </div> |
| 943 | |
| 944 | <!-- ======================================================================= --> |
| 945 | <div class="doc_subsection"> |
Chris Lattner | 2629922 | 2006-11-18 07:51:14 +0000 | [diff] [blame] | 946 | <a name="alpha-be">Known problems with the Alpha back-end</a> |
| 947 | </div> |
| 948 | |
| 949 | <div class="doc_text"> |
| 950 | |
| 951 | <ul> |
| 952 | |
| 953 | <li>On 21164s, some rare FP arithmetic sequences which may trap do not have the |
| 954 | appropriate nops inserted to ensure restartability.</li> |
| 955 | |
John Criswell | c0c186d | 2005-11-08 21:11:33 +0000 | [diff] [blame] | 956 | </ul> |
| 957 | </div> |
| 958 | |
Chris Lattner | 2629922 | 2006-11-18 07:51:14 +0000 | [diff] [blame] | 959 | <!-- ======================================================================= --> |
| 960 | <div class="doc_subsection"> |
Chris Lattner | f3e5bc6 | 2007-05-14 06:56:09 +0000 | [diff] [blame] | 961 | <a name="c-be">Known problems with the C back-end</a> |
Chris Lattner | 2629922 | 2006-11-18 07:51:14 +0000 | [diff] [blame] | 962 | </div> |
| 963 | |
| 964 | <div class="doc_text"> |
| 965 | |
| 966 | <ul> |
Chris Lattner | 5733b27 | 2008-06-05 06:35:40 +0000 | [diff] [blame] | 967 | <li><a href="http://llvm.org/PR802">The C backend has only basic support for |
| 968 | inline assembly code</a>.</li> |
Chris Lattner | 725a0d8 | 2007-09-26 06:01:35 +0000 | [diff] [blame] | 969 | <li><a href="http://llvm.org/PR1658">The C backend violates the ABI of common |
| 970 | C++ programs</a>, preventing intermixing between C++ compiled by the CBE and |
Gabor Greif | 4906abe | 2009-03-02 12:02:51 +0000 | [diff] [blame] | 971 | C++ code compiled with <tt>llc</tt> or native compilers.</li> |
Duncan Sands | f74c0cc | 2008-02-10 13:40:55 +0000 | [diff] [blame] | 972 | <li>The C backend does not support all exception handling constructs.</li> |
Duncan Sands | 50723a9 | 2009-02-25 11:51:54 +0000 | [diff] [blame] | 973 | <li>The C backend does not support arbitrary precision integers.</li> |
Chris Lattner | 2629922 | 2006-11-18 07:51:14 +0000 | [diff] [blame] | 974 | </ul> |
| 975 | |
| 976 | </div> |
John Criswell | c0c186d | 2005-11-08 21:11:33 +0000 | [diff] [blame] | 977 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 978 | |
| 979 | <!-- ======================================================================= --> |
| 980 | <div class="doc_subsection"> |
Chris Lattner | c66bfef | 2010-03-17 04:41:49 +0000 | [diff] [blame] | 981 | <a name="c-fe">Known problems with the llvm-gcc C and C++ front-end</a> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 982 | </div> |
Chris Lattner | 47588f9 | 2003-10-02 05:07:23 +0000 | [diff] [blame] | 983 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 984 | <div class="doc_text"> |
Chris Lattner | c5d658a | 2006-03-03 00:34:26 +0000 | [diff] [blame] | 985 | |
Chris Lattner | 5733b27 | 2008-06-05 06:35:40 +0000 | [diff] [blame] | 986 | <p>The only major language feature of GCC not supported by llvm-gcc is |
| 987 | the <tt>__builtin_apply</tt> family of builtins. However, some extensions |
| 988 | are only supported on some targets. For example, trampolines are only |
Duncan Sands | 27aff87 | 2008-06-08 20:18:35 +0000 | [diff] [blame] | 989 | supported on some targets (these are used when you take the address of a |
| 990 | nested function).</p> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 991 | |
Chris Lattner | 5733b27 | 2008-06-05 06:35:40 +0000 | [diff] [blame] | 992 | <p>If you run into GCC extensions which are not supported, please let us know. |
| 993 | </p> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 994 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 995 | </div> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 996 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 997 | <!-- ======================================================================= --> |
| 998 | <div class="doc_subsection"> |
Chris Lattner | 1eb4df6 | 2008-10-30 03:58:13 +0000 | [diff] [blame] | 999 | <a name="fortran-fe">Known problems with the llvm-gcc Fortran front-end</a> |
| 1000 | </div> |
| 1001 | |
| 1002 | <div class="doc_text"> |
Gabor Greif | ba10fe0 | 2008-11-04 21:50:59 +0000 | [diff] [blame] | 1003 | <ul> |
Chris Lattner | 1eb4df6 | 2008-10-30 03:58:13 +0000 | [diff] [blame] | 1004 | <li>Fortran support generally works, but there are still several unresolved bugs |
Chris Lattner | 61358ab | 2009-10-13 17:48:04 +0000 | [diff] [blame] | 1005 | in <a href="http://llvm.org/bugs/">Bugzilla</a>. Please see the |
| 1006 | tools/gfortran component for details.</li> |
Gabor Greif | ba10fe0 | 2008-11-04 21:50:59 +0000 | [diff] [blame] | 1007 | </ul> |
Chris Lattner | 1eb4df6 | 2008-10-30 03:58:13 +0000 | [diff] [blame] | 1008 | </div> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 1009 | |
Chris Lattner | 2b659ef | 2008-02-12 06:29:45 +0000 | [diff] [blame] | 1010 | <!-- ======================================================================= --> |
| 1011 | <div class="doc_subsection"> |
Chris Lattner | 5733b27 | 2008-06-05 06:35:40 +0000 | [diff] [blame] | 1012 | <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] | 1013 | </div> |
| 1014 | |
| 1015 | <div class="doc_text"> |
John Criswell | 524a5dd | 2009-03-02 15:28:15 +0000 | [diff] [blame] | 1016 | The llvm-gcc 4.2 Ada compiler works fairly well; however, this is not a mature |
| 1017 | technology, and problems should be expected. |
Chris Lattner | 2b659ef | 2008-02-12 06:29:45 +0000 | [diff] [blame] | 1018 | <ul> |
Duncan Sands | 27aff87 | 2008-06-08 20:18:35 +0000 | [diff] [blame] | 1019 | <li>The Ada front-end currently only builds on X86-32. This is mainly due |
John Criswell | 524a5dd | 2009-03-02 15:28:15 +0000 | [diff] [blame] | 1020 | to lack of trampoline support (pointers to nested functions) on other platforms. |
| 1021 | 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] | 1022 | which does support trampolines.</li> |
| 1023 | <li>The Ada front-end <a href="http://llvm.org/PR2007">fails to bootstrap</a>. |
Duncan Sands | 326a498 | 2009-02-25 11:59:06 +0000 | [diff] [blame] | 1024 | This is due to lack of LLVM support for <tt>setjmp</tt>/<tt>longjmp</tt> style |
| 1025 | exception handling, which is used internally by the compiler. |
Chris Lattner | 61358ab | 2009-10-13 17:48:04 +0000 | [diff] [blame] | 1026 | Workaround: configure with <tt>--disable-bootstrap</tt>.</li> |
Duncan Sands | 978bcee | 2008-10-13 17:27:23 +0000 | [diff] [blame] | 1027 | <li>The c380004, <a href="http://llvm.org/PR2010">c393010</a> |
| 1028 | and <a href="http://llvm.org/PR2421">cxg2021</a> ACATS tests fail |
Duncan Sands | 326a498 | 2009-02-25 11:59:06 +0000 | [diff] [blame] | 1029 | (c380004 also fails with gcc-4.2 mainline). |
| 1030 | If the compiler is built with checks disabled then <a href="http://llvm.org/PR2010">c393010</a> |
| 1031 | causes the compiler to go into an infinite loop, using up all system memory.</li> |
Duncan Sands | dd3e672 | 2009-03-02 16:35:57 +0000 | [diff] [blame] | 1032 | <li>Some GCC specific Ada tests continue to crash the compiler.</li> |
Chris Lattner | 61358ab | 2009-10-13 17:48:04 +0000 | [diff] [blame] | 1033 | <li>The <tt>-E</tt> binder option (exception backtraces) |
Chris Lattner | 2b659ef | 2008-02-12 06:29:45 +0000 | [diff] [blame] | 1034 | <a href="http://llvm.org/PR1982">does not work</a> and will result in programs |
Chris Lattner | 61358ab | 2009-10-13 17:48:04 +0000 | [diff] [blame] | 1035 | crashing if an exception is raised. Workaround: do not use <tt>-E</tt>.</li> |
Chris Lattner | 2b659ef | 2008-02-12 06:29:45 +0000 | [diff] [blame] | 1036 | <li>Only discrete types <a href="http://llvm.org/PR1981">are allowed to start |
| 1037 | or finish at a non-byte offset</a> in a record. Workaround: do not pack records |
| 1038 | or use representation clauses that result in a field of a non-discrete type |
| 1039 | starting or finishing in the middle of a byte.</li> |
Chris Lattner | e6e1b35 | 2008-06-08 21:19:07 +0000 | [diff] [blame] | 1040 | <li>The <tt>lli</tt> interpreter <a href="http://llvm.org/PR2009">considers |
| 1041 | 'main' as generated by the Ada binder to be invalid</a>. |
| 1042 | Workaround: hand edit the file to use pointers for <tt>argv</tt> and |
| 1043 | <tt>envp</tt> rather than integers.</li> |
| 1044 | <li>The <tt>-fstack-check</tt> option <a href="http://llvm.org/PR2008">is |
| 1045 | ignored</a>.</li> |
Chris Lattner | 2b659ef | 2008-02-12 06:29:45 +0000 | [diff] [blame] | 1046 | </ul> |
| 1047 | </div> |
| 1048 | |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 1049 | <!-- *********************************************************************** --> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 1050 | <div class="doc_section"> |
| 1051 | <a name="additionalinfo">Additional Information</a> |
| 1052 | </div> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 1053 | <!-- *********************************************************************** --> |
| 1054 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 1055 | <div class="doc_text"> |
| 1056 | |
Chris Lattner | 416db10 | 2005-05-16 17:13:10 +0000 | [diff] [blame] | 1057 | <p>A wide variety of additional information is available on the <a |
Chris Lattner | b4b0ce7 | 2007-05-18 00:44:29 +0000 | [diff] [blame] | 1058 | href="http://llvm.org">LLVM web page</a>, in particular in the <a |
| 1059 | href="http://llvm.org/docs/">documentation</a> section. The web page also |
Reid Spencer | 669ed45 | 2007-07-09 08:04:31 +0000 | [diff] [blame] | 1060 | contains versions of the API documentation which is up-to-date with the |
| 1061 | Subversion version of the source code. |
Misha Brukman | 109d9e8 | 2005-03-30 19:14:24 +0000 | [diff] [blame] | 1062 | You can access versions of these documents specific to this release by going |
| 1063 | into the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 1064 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 1065 | <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] | 1066 | us via the <a href="http://llvm.org/docs/#maillist"> mailing |
Chris Lattner | 5eccca4 | 2003-12-12 21:22:16 +0000 | [diff] [blame] | 1067 | lists</a>.</p> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 1068 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 1069 | </div> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 1070 | |
| 1071 | <!-- *********************************************************************** --> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 1072 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 1073 | <hr> |
Misha Brukman | 2061e89 | 2003-11-22 01:23:39 +0000 | [diff] [blame] | 1074 | <address> |
Misha Brukman | 38847d5 | 2003-12-21 22:53:21 +0000 | [diff] [blame] | 1075 | <a href="http://jigsaw.w3.org/css-validator/check/referer"><img |
Misha Brukman | 4440870 | 2008-12-11 17:34:48 +0000 | [diff] [blame] | 1076 | src="http://jigsaw.w3.org/css-validator/images/vcss-blue" alt="Valid CSS"></a> |
Misha Brukman | 2061e89 | 2003-11-22 01:23:39 +0000 | [diff] [blame] | 1077 | <a href="http://validator.w3.org/check/referer"><img |
Misha Brukman | 4440870 | 2008-12-11 17:34:48 +0000 | [diff] [blame] | 1078 | src="http://www.w3.org/Icons/valid-html401-blue" alt="Valid HTML 4.01"></a> |
Misha Brukman | 2061e89 | 2003-11-22 01:23:39 +0000 | [diff] [blame] | 1079 | |
Chris Lattner | b4b0ce7 | 2007-05-18 00:44:29 +0000 | [diff] [blame] | 1080 | <a href="http://llvm.org/">LLVM Compiler Infrastructure</a><br> |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 1081 | Last modified: $Date$ |
Misha Brukman | 2061e89 | 2003-11-22 01:23:39 +0000 | [diff] [blame] | 1082 | </address> |
Chris Lattner | 79c3fe1 | 2003-10-02 04:57:28 +0000 | [diff] [blame] | 1083 | |
Misha Brukman | 500bc30 | 2003-11-22 00:38:41 +0000 | [diff] [blame] | 1084 | </body> |
| 1085 | </html> |