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gerrit-public.fairphone.software / fp2-dev / platform / external / llvm / 29817ea67f568d0e7111777464705cbbfe3db4de / . / docs / ReleaseNotes.html
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Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]7 <title>LLVM 3.0 Release Notes</title>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]8</head>
9<body>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]10
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]11<h1>LLVM 3.0 Release Notes</h1>
Mikhail Glushenkovea65d7d2008-10-13 02:08:34 +0000[diff] [blame]12
Chris Lattner0e464a92010-03-17 04:02:39 +0000[diff] [blame]13<img align=right src="http://llvm.org/img/DragonSmall.png"
Gabor Greifee2187a2010-04-22 10:21:43 +0000[diff] [blame]14 width="136" height="136" alt="LLVM Dragon Logo">
Chris Lattner0e464a92010-03-17 04:02:39 +0000[diff] [blame]15
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]16<ol>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]17 <li><a href="#intro">Introduction</a></li>
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]18 <li><a href="#subproj">Sub-project Status Update</a></li>
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]19 <li><a href="#externalproj">External Projects Using LLVM 3.0</a></li>
20 <li><a href="#whatsnew">What's New in LLVM 3.0?</a></li>
Chris Lattner4b538b92004-04-30 22:17:12 +0000[diff] [blame]21 <li><a href="GettingStarted.html">Installation Instructions</a></li>
Dan Gohman44aa9212008-10-14 16:23:02 +0000[diff] [blame]22 <li><a href="#knownproblems">Known Problems</a></li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]23 <li><a href="#additionalinfo">Additional Information</a></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]24</ol>
25
Chris Lattner7911ce22004-05-23 21:07:27 +0000[diff] [blame]26<div class="doc_author">
NAKAMURA Takumib9a33632011-04-09 02:13:37 +0000[diff] [blame]27 <p>Written by the <a href="http://llvm.org/">LLVM Team</a></p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]28</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]29
Chris Lattner49123fd2011-04-06 06:29:50 +0000[diff] [blame]30<!--
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]31<h1 style="color:red">These are in-progress notes for the upcoming LLVM 3.0
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]32release.<br>
33You may prefer the
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]34<a href="http://llvm.org/releases/2.9/docs/ReleaseNotes.html">LLVM 2.9
Dan Gohmanb44f6c62010-05-03 23:51:05 +0000[diff] [blame]35Release Notes</a>.</h1>
Chris Lattner49123fd2011-04-06 06:29:50 +0000[diff] [blame]36 -->
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]37
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]38<!-- *********************************************************************** -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]39<h2>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]40 <a name="intro">Introduction</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]41</h2>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]42<!-- *********************************************************************** -->
43
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]44<div>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]45
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]46<p>This document contains the release notes for the LLVM Compiler
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]47Infrastructure, release 3.0. Here we describe the status of LLVM, including
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]48major improvements from the previous release and significant known problems.
Mikhail Glushenkovf795ef02009-03-01 18:09:47 +0000[diff] [blame]49All LLVM releases may be downloaded from the <a
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]50href="http://llvm.org/releases/">LLVM releases web site</a>.</p>
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]51
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame]52<p>For more information about LLVM, including information about the latest
Chris Lattnerc463b272005-10-29 07:07:09 +0000[diff] [blame]53release, please check out the <a href="http://llvm.org/">main LLVM
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]54web site</a>. If you have questions or comments, the <a
Chris Lattnerc66bfef2010-03-17 04:41:49 +0000[diff] [blame]55href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVM Developer's
56Mailing List</a> is a good place to send them.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]57
Mikhail Glushenkovea65d7d2008-10-13 02:08:34 +0000[diff] [blame]58<p>Note that if you are reading this file from a Subversion checkout or the
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]59main LLVM web page, this document applies to the <i>next</i> release, not the
Gabor Greiffa933f82008-10-14 11:00:32 +0000[diff] [blame]60current one. To see the release notes for a specific release, please see the
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]61<a href="http://llvm.org/releases/">releases page</a>.</p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]62
63</div>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]64
Chris Lattnere4dc1962011-04-05 23:22:33 +0000[diff] [blame]65<!-- Features that need text if they're finished for 3.1:
66 ARM EHABI
Chris Lattner914ce462010-04-22 06:28:20 +0000[diff] [blame]67 combiner-aa?
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]68 strong phi elim
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]69 loop dependence analysis
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]70 CorrelatedValuePropagation
Chris Lattnere4dc1962011-04-05 23:22:33 +0000[diff] [blame]71 lib/Transforms/IPO/MergeFunctions.cpp => consider for 3.1.
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]72 -->
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]73
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]74<!-- *********************************************************************** -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]75<h2>
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]76 <a name="subproj">Sub-project Status Update</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]77</h2>
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]78<!-- *********************************************************************** -->
Chris Lattnerea34f642008-06-08 21:34:41 +0000[diff] [blame]79
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]80<div>
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]81<p>
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]82The LLVM 3.0 distribution currently consists of code from the core LLVM
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]83repository (which roughly includes the LLVM optimizers, code generators
84and supporting tools), the Clang repository and the llvm-gcc repository. In
85addition to this code, the LLVM Project includes other sub-projects that are in
86development. Here we include updates on these subprojects.
Bill Wendling63d8c552009-03-02 04:28:57 +0000[diff] [blame]87</p>
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]88
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]89<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]90<h3>
Chris Lattnerfb97b2d2008-10-13 18:11:54 +0000[diff] [blame]91<a name="clang">Clang: C/C++/Objective-C Frontend Toolkit</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]92</h3>
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]93
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]94<div>
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]95
Chris Lattner095539f2010-04-26 17:42:18 +0000[diff] [blame]96<p><a href="http://clang.llvm.org/">Clang</a> is an LLVM front end for the C,
97C++, and Objective-C languages. Clang aims to provide a better user experience
98through expressive diagnostics, a high level of conformance to language
99standards, fast compilation, and low memory use. Like LLVM, Clang provides a
100modular, library-based architecture that makes it suitable for creating or
101integrating with other development tools. Clang is considered a
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]102production-quality compiler for C, Objective-C, C++ and Objective-C++ on x86
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]103(32- and 64-bit), and for darwin/arm targets.</p>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]104
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]105<p>In the LLVM 3.0 time-frame, the Clang team has made many improvements:</p>
Douglas Gregorba087df2011-10-15 00:48:01 +0000[diff] [blame]106
107<ul>
108 <li>Greatly improved support for building C++ applications, with greater stability and better diagnostics.</li>
109
110 <li><a href="http://clang.llvm.org/cxx_status.html">Improved support</a> for the <a href="http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=50372 ">C++ 2011</a> standard, including implementations of non-static data member initializers, alias templates, delegating constructors, the range-based for loop, and implicitly-generated move constructors and move assignment operators, among others.</li>
111
112 <li>Implemented support for some features of the upcoming C1x standard, including static assertions and generic selections.</li>
113
114 <li>Better detection of include and linking paths for system headers and libraries, especially for Linux distributions.</li>
115
116 <li>Implemented support for <a href="http://clang.llvm.org/docs/AutomaticReferenceCounting.html">Automatic Reference Counting</a> for Objective-C.</li>
117
118 <li>Implemented a number of optimizations in <tt>libclang</tt>, the Clang C interface, to improve the performance of code completion and the mapping from source locations to abstract syntax tree nodes.</li>
119</ul>
120
Chris Lattner0a6f6d52011-04-05 07:19:28 +0000[diff] [blame]121
Duncan Sandsf3ba7af2011-04-06 08:07:40 +0000[diff] [blame]122<p>If Clang rejects your code but another compiler accepts it, please take a
Chris Lattner0a6f6d52011-04-05 07:19:28 +0000[diff] [blame]123look at the <a href="http://clang.llvm.org/compatibility.html">language
Duncan Sandsf3ba7af2011-04-06 08:07:40 +0000[diff] [blame]124compatibility</a> guide to make sure this is not intentional or a known issue.
Chris Lattner0a6f6d52011-04-05 07:19:28 +0000[diff] [blame]125</p>
Bill Wendling741748a2008-10-27 09:27:33 +0000[diff] [blame]126
Chris Lattnerfb97b2d2008-10-13 18:11:54 +0000[diff] [blame]127</div>
128
129<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]130<h3>
Duncan Sands528a5102011-04-04 11:09:08 +0000[diff] [blame]131<a name="dragonegg">DragonEgg: GCC front-ends, LLVM back-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]132</h3>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]133
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]134<div>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]135<p>
Duncan Sands528a5102011-04-04 11:09:08 +0000[diff] [blame]136<a href="http://dragonegg.llvm.org/">DragonEgg</a> is a
137<a href="http://gcc.gnu.org/wiki/plugins">gcc plugin</a> that replaces GCC's
138optimizers and code generators with LLVM's.
139Currently it requires a patched version of gcc-4.5.
140The plugin can target the x86-32 and x86-64 processor families and has been
141used successfully on the Darwin, FreeBSD and Linux platforms.
142The Ada, C, C++ and Fortran languages work well.
143The plugin is capable of compiling plenty of Obj-C, Obj-C++ and Java but it is
144not known whether the compiled code actually works or not!
Duncan Sands749fd832010-04-02 09:23:15 +0000[diff] [blame]145</p>
146
147<p>
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]148The 3.0 release has the following notable changes:
Duncan Sands4b1da2b2010-09-30 17:37:34 +0000[diff] [blame]149<ul>
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]150<!--
151<li></li>
152-->
Duncan Sands4b1da2b2010-09-30 17:37:34 +0000[diff] [blame]153</ul>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]154
155</div>
156
Chris Lattner75547712010-10-03 23:49:06 +0000[diff] [blame]157<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]158<h3>
Chris Lattner75547712010-10-03 23:49:06 +0000[diff] [blame]159<a name="compiler-rt">compiler-rt: Compiler Runtime Library</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]160</h3>
Chris Lattner75547712010-10-03 23:49:06 +0000[diff] [blame]161
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]162<div>
Chris Lattner75547712010-10-03 23:49:06 +0000[diff] [blame]163<p>
164The new LLVM <a href="http://compiler-rt.llvm.org/">compiler-rt project</a>
165is a simple library that provides an implementation of the low-level
166target-specific hooks required by code generation and other runtime components.
167For example, when compiling for a 32-bit target, converting a double to a 64-bit
168unsigned integer is compiled into a runtime call to the "__fixunsdfdi"
169function. The compiler-rt library provides highly optimized implementations of
170this and other low-level routines (some are 3x faster than the equivalent
171libgcc routines).</p>
172
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]173<p>In the LLVM 3.0 timeframe,</p>
Chris Lattner75547712010-10-03 23:49:06 +0000[diff] [blame]174
175</div>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]176
177<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]178<h3>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]179<a name="lldb">LLDB: Low Level Debugger</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]180</h3>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]181
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]182<div>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]183<p>
Chris Lattner75547712010-10-03 23:49:06 +0000[diff] [blame]184<a href="http://lldb.llvm.org/">LLDB</a> is a brand new member of the LLVM
185umbrella of projects. LLDB is a next generation, high-performance debugger. It
186is built as a set of reusable components which highly leverage existing
187libraries in the larger LLVM Project, such as the Clang expression parser, the
188LLVM disassembler and the LLVM JIT.</p>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]189
190<p>
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]191LLDB is has advanced by leaps and bounds in the 3.0 timeframe. It is
Chris Lattnerdf448a32011-04-06 00:56:12 +0000[diff] [blame]192dramatically more stable and useful, and includes both a new <a
193href="http://lldb.llvm.org/tutorial.html">tutorial</a> and a <a
194href="http://lldb.llvm.org/lldb-gdb.html">side-by-side comparison with
195GDB</a>.</p>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]196
197</div>
198
199<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]200<h3>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]201<a name="libc++">libc++: C++ Standard Library</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]202</h3>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]203
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]204<div>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]205<p>
Tobias Grossercdce44b2010-10-06 21:07:30 +0000[diff] [blame]206<a href="http://libcxx.llvm.org/">libc++</a> is another new member of the LLVM
Chris Lattner75547712010-10-03 23:49:06 +0000[diff] [blame]207family. It is an implementation of the C++ standard library, written from the
208ground up to specifically target the forthcoming C++'0X standard and focus on
209delivering great performance.</p>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]210
211<p>
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]212In the LLVM 3.0 timeframe,</p>
Chris Lattner0a6f6d52011-04-05 07:19:28 +0000[diff] [blame]213
Chris Lattner2009c492011-04-06 00:59:18 +0000[diff] [blame]214<p>
215Like compiler_rt, libc++ is now <a href="DeveloperPolicy.html#license">dual
216 licensed</a> under the MIT and UIUC license, allowing it to be used more
217 permissively.
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]218</p>
219
220</div>
221
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]222
Chris Lattner3d6a80a2011-04-07 03:08:22 +0000[diff] [blame]223<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]224<h3>
Chris Lattner3d6a80a2011-04-07 03:08:22 +0000[diff] [blame]225<a name="LLBrowse">LLBrowse: IR Browser</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]226</h3>
Daniel Dunbar97b01a82010-10-04 17:39:47 +0000[diff] [blame]227
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]228<div>
Chris Lattner3d6a80a2011-04-07 03:08:22 +0000[diff] [blame]229<p>
230<a href="http://llvm.org/svn/llvm-project/llbrowse/trunk/doc/LLBrowse.html">
231 LLBrowse</a> is an interactive viewer for LLVM modules. It can load any LLVM
232 module and displays its contents as an expandable tree view, facilitating an
233 easy way to inspect types, functions, global variables, or metadata nodes. It
234 is fully cross-platform, being based on the popular wxWidgets GUI toolkit.
235</p>
236</div>
237
238<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]239<h3>
Chris Lattner3d6a80a2011-04-07 03:08:22 +0000[diff] [blame]240<a name="vmkit">VMKit</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]241</h3>
Chris Lattner3d6a80a2011-04-07 03:08:22 +0000[diff] [blame]242
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]243<div>
Chris Lattner3d6a80a2011-04-07 03:08:22 +0000[diff] [blame]244<p>The <a href="http://vmkit.llvm.org/">VMKit project</a> is an implementation
245 of a Java Virtual Machine (Java VM or JVM) that uses LLVM for static and
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]246 just-in-time compilation. As of LLVM 3.0, VMKit now supports generational
Chris Lattner3d6a80a2011-04-07 03:08:22 +0000[diff] [blame]247 garbage collectors. The garbage collectors are provided by the MMTk framework,
248 and VMKit can be configured to use one of the numerous implemented collectors
249 of MMTk.
250</p>
251</div>
252
253
Daniel Dunbar97b01a82010-10-04 17:39:47 +0000[diff] [blame]254<!--=========================================================================-->
Chris Lattner7a8e6c52011-04-05 18:38:45 +0000[diff] [blame]255<!--
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]256<h3>
Daniel Dunbar97b01a82010-10-04 17:39:47 +0000[diff] [blame]257<a name="klee">KLEE: A Symbolic Execution Virtual Machine</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]258</h3>
Daniel Dunbar97b01a82010-10-04 17:39:47 +0000[diff] [blame]259
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]260<div>
Daniel Dunbar97b01a82010-10-04 17:39:47 +0000[diff] [blame]261<p>
262<a href="http://klee.llvm.org/">KLEE</a> is a symbolic execution framework for
263programs in LLVM bitcode form. KLEE tries to symbolically evaluate "all" paths
264through the application and records state transitions that lead to fault
265states. This allows it to construct testcases that lead to faults and can even
266be used to verify some algorithms.
267</p>
268
Chris Lattnerbe2e1b52011-03-10 07:43:44 +0000[diff] [blame]269<p>UPDATE!</p>
Chris Lattner7a8e6c52011-04-05 18:38:45 +0000[diff] [blame]270</div>-->
Daniel Dunbar97b01a82010-10-04 17:39:47 +0000[diff] [blame]271
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]272</div>
Daniel Dunbar97b01a82010-10-04 17:39:47 +0000[diff] [blame]273
Chris Lattnerab68e9e2009-02-26 22:33:38 +0000[diff] [blame]274<!-- *********************************************************************** -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]275<h2>
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]276 <a name="externalproj">External Open Source Projects Using LLVM 3.0</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]277</h2>
Chris Lattnerab68e9e2009-02-26 22:33:38 +0000[diff] [blame]278<!-- *********************************************************************** -->
279
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]280<div>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]281
282<p>An exciting aspect of LLVM is that it is used as an enabling technology for
283 a lot of other language and tools projects. This section lists some of the
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]284 projects that have already been updated to work with LLVM 3.0.</p>
Chris Lattner75547712010-10-03 23:49:06 +0000[diff] [blame]285
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]286<!--=========================================================================-->
Bill Wendling29817ea2011-10-26 00:14:36 +0000[diff] [blame^]287<h3>ClamAV</h3>
288
289<div>
Bill Wendlingf2a78332011-10-25 01:01:42 +0000[diff] [blame]290
Bill Wendling29817ea2011-10-26 00:14:36 +0000[diff] [blame^]291<p><a href="http://www.clamav.net">Clam AntiVirus</a> is an open source (GPL)
292 anti-virus toolkit for UNIX, designed especially for e-mail scanning on mail
293 gateways.</p>
294
295<p>Since version 0.96 it
296 has <a href="http://vrt-sourcefire.blogspot.com/2010/09/introduction-to-clamavs-low-level.html">bytecode
297 signatures</a> that allow writing detections for complex malware.</p>
298
299<p>It uses LLVM's JIT to speed up the execution of bytecode on X86, X86-64,
300 PPC32/64, falling back to its own interpreter otherwise. The git version was
301 updated to work with LLVM 3.0.</p>
302
303</div>
304
305<!--=========================================================================-->
Bill Wendlingf2a78332011-10-25 01:01:42 +0000[diff] [blame]306<!-- FIXME: Comment out
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]307<h3>Crack Programming Language</h3>
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]308
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]309<div>
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]310<p>
311<a href="http://code.google.com/p/crack-language/">Crack</a> aims to provide the
312ease of development of a scripting language with the performance of a compiled
313language. The language derives concepts from C++, Java and Python, incorporating
314object-oriented programming, operator overloading and strong typing.</p>
315</div>
Bill Wendlingf2a78332011-10-25 01:01:42 +0000[diff] [blame]316-->
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]317
318<!--=========================================================================-->
Bill Wendlingf9778192011-10-26 00:09:55 +0000[diff] [blame]319<h3>Glasgow Haskell Compiler (GHC)</h3>
320
321<div>
322
323<p>GHC is an open source, state-of-the-art programming suite for Haskell, a
324 standard lazy functional programming language. It includes an optimizing
325 static compiler generating good code for a variety of platforms, together
326 with an interactive system for convenient, quick development.</p>
327
328<p>GHC 7.0 and onwards include an LLVM code generator, supporting LLVM 2.8 and
329 later. Since LLVM 2.9, GHC now includes experimental support for the ARM
330 platform with LLVM 3.0.</p>
331
332</div>
333
334<!--=========================================================================-->
Bill Wendlingf62333d2011-10-25 20:35:31 +0000[diff] [blame]335<h3>gwXscript</h3>
336
337<div>
338
339<p><a href="http://botwars.tk/gwscript/">gwXscript</a> is an object oriented,
340 aspect orientied programing language which can create both, executables (ELF,
341 EXE) and shared libraries (DLL, SO, DYNLIB). The compiler is implemented in
342 its own language and translates scripts into LLVM-IR which can be optimized
343 and translated into native code by the LLVM framework. Source code in
344 gwScript contains definitions that expand the namespaces. So you can build
345 your project and simply 'plug out' features by removing a file. The remaining
346 project does not leave scars since you directly separate concerns by the
347 'template' feature of gwX. It is also possible to add new features to a
348 project by just adding files and without editing the original project. This
349 language is used for example to create games or content management systems
350 that should be extendable.</p>
351
352<p>gwXscript is strongly typed and offers comfort with its native types string,
353 hash and array. You can easily write new libraries in gwXscript or native
354 code. gwXscript is type safe and users should not be able to crash your
355 program or execute malicious code except code that is eating CPU time.</p>
356
357</div>
358
359<!--=========================================================================-->
Bill Wendlingba226272011-10-25 20:37:45 +0000[diff] [blame]360<h3>Portable OpenCL (pocl)</h3>
361
362<div>
363
364<p>Portable OpenCL is an open source implementation of the OpenCL standard which
365 can be easily adapted for new targets. One of the goals of the project is
366 improving performance portability of OpenCL programs, avoiding the need for
367 target-dependent manual optimizations. A "native" target is included, which
368 allows running OpenCL kernels on the host (CPU).</p>
369
370</div>
371
372<!--=========================================================================-->
Bill Wendling0bad98c2011-10-25 20:39:06 +0000[diff] [blame]373<h3>Pure</h3>
374
375<div>
376<p><a href="http://pure-lang.googlecode.com/">Pure</a> is an
377 algebraic/functional programming language based on term rewriting. Programs
378 are collections of equations which are used to evaluate expressions in a
379 symbolic fashion. The interpreter uses LLVM as a backend to JIT-compile Pure
380 programs to fast native code. Pure offers dynamic typing, eager and lazy
381 evaluation, lexical closures, a hygienic macro system (also based on term
382 rewriting), built-in list and matrix support (including list and matrix
383 comprehensions) and an easy-to-use interface to C and other programming
384 languages (including the ability to load LLVM bitcode modules, and inline C,
385 C++, Fortran and Faust code in Pure programs if the corresponding LLVM-enabled
386 compilers are installed).</p>
387
388<p>Pure version 0.48 has been tested and is known to work with LLVM 3.0
389 (and continues to work with older LLVM releases &gt;= 2.5).</p>
390
391</div>
392
393<!--=========================================================================-->
Bill Wendling537d85b2011-10-26 00:12:04 +0000[diff] [blame]394<h3>Renderscript</h3>
395
396<div>
397
398<p><a href="http://developer.android.com/guide/topics/renderscript/index.html">Renderscript</a>
399 is Android's advanced 3D graphics rendering and compute API. It provides a
400 portable C99-based language with extensions to facilitate common use cases
401 for enhancing graphics and thread level parallelism. The Renderscript
402 compiler frontend is based on Clang/LLVM. It emits a portable bitcode format
403 for the actual compiled script code, as well as reflects a Java interface for
404 developers to control the execution of the compiled bitcode. Executable
405 machine code is then generated from this bitcode by an LLVM backend on the
406 device. Renderscript is thus able to provide a mechanism by which Android
407 developers can improve performance of their applications while retaining
408 portability.</p>
409
410</div>
411
412<!--=========================================================================-->
Bill Wendling7d5b6212011-10-25 20:40:26 +0000[diff] [blame]413<h3>SAFECode</h3>
414
415<div>
416
417<p><a href="http://safecode.cs.illinois.edu">SAFECode</a> is a memory safe C/C++
418 compiler built using LLVM. It takes standard, unannotated C/C++ code,
419 analyzes the code to ensure that memory accesses and array indexing
420 operations are safe, and instruments the code with run-time checks when
421 safety cannot be proven statically. SAFECode can be used as a debugging aid
422 (like Valgrind) to find and repair memory safety bugs. It can also be used
423 to protect code from security attacks at run-time.</p>
424
425</div>
426
427<!--=========================================================================-->
Bill Wendling2d7b4af2011-10-25 20:24:32 +0000[diff] [blame]428<h3>TTA-based Co-design Environment (TCE)</h3>
429
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]430<div>
Bill Wendling2d7b4af2011-10-25 20:24:32 +0000[diff] [blame]431
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]432<p>TCE is a toolset for designing application-specific processors (ASP) based on
Bill Wendling2d7b4af2011-10-25 20:24:32 +0000[diff] [blame]433 the Transport triggered architecture (TTA). The toolset provides a complete
434 co-design flow from C/C++ programs down to synthesizable VHDL and parallel
435 program binaries. Processor customization points include the register files,
436 function units, supported operations, and the interconnection network.</p>
437
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]438<p>TCE uses Clang and LLVM for C/C++ language support, target independent
Bill Wendling2d7b4af2011-10-25 20:24:32 +0000[diff] [blame]439 optimizations and also for parts of code generation. It generates new
440 LLVM-based code generators <i>on the fly</i> for the designed TTA processors
441 and loads them in to the compiler backend as runtime libraries to avoid
442 per-target recompilation of larger parts of the compiler chain.</p>
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]443</div>
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]444
445
446<!--=========================================================================-->
Bill Wendling628c2662011-10-25 20:27:37 +0000[diff] [blame]447<h3>Tart Programming Language</h3>
448
449<div>
450
451<p><a href="http://code.google.com/p/tart/">Tart</a> is a general-purpose,
452 strongly typed programming language designed for application
453 developers. Strongly inspired by Python and C#, Tart focuses on practical
454 solutions for the professional software developer, while avoiding the clutter
455 and boilerplate of legacy languages like Java and C++. Although Tart is still
456 in development, the current implementation supports many features expected of
457 a modern programming language, such as garbage collection, powerful
458 bidirectional type inference, a greatly simplified syntax for template
459 metaprogramming, closures and function literals, reflection, operator
460 overloading, explicit mutability and immutability, and much more. Tart is
461 flexible enough to accommodate a broad range of programming styles and
462 philosophies, while maintaining a strong commitment to simplicity, minimalism
463 and elegance in design.</p>
464
465</div>
466
467<!--=========================================================================-->
Bill Wendlingf2a78332011-10-25 01:01:42 +0000[diff] [blame]468<!--
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]469<h3>PinaVM</h3>
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]470
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]471<div>
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]472<p><a href="http://gitorious.org/pinavm/pages/Home">PinaVM</a> is an open
473source, <a href="http://www.systemc.org/">SystemC</a> front-end. Unlike many
474other front-ends, PinaVM actually executes the elaboration of the
475program analyzed using LLVM's JIT infrastructure. It later enriches the
476bitcode with SystemC-specific information.</p>
477</div>
Bill Wendlingf2a78332011-10-25 01:01:42 +0000[diff] [blame]478-->
479
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]480
481<!--=========================================================================-->
Bill Wendlingf2a78332011-10-25 01:01:42 +0000[diff] [blame]482<!--
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]483<h3 id="icedtea">IcedTea Java Virtual Machine Implementation</h3>
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]484
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]485<div>
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]486<p>
487<a href="http://icedtea.classpath.org/wiki/Main_Page">IcedTea</a> provides a
488harness to build OpenJDK using only free software build tools and to provide
489replacements for the not-yet free parts of OpenJDK. One of the extensions that
490IcedTea provides is a new JIT compiler named <a
491href="http://icedtea.classpath.org/wiki/ZeroSharkFaq">Shark</a> which uses LLVM
492to provide native code generation without introducing processor-dependent
493code.
494</p>
495
496<p> OpenJDK 7 b112, IcedTea6 1.9 and IcedTea7 1.13 and later have been tested
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]497and are known to work with LLVM 3.0 (and continue to work with older LLVM
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]498releases &gt;= 2.6 as well).</p>
499</div>
Bill Wendlingf2a78332011-10-25 01:01:42 +0000[diff] [blame]500-->
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]501
502<!--=========================================================================-->
Bill Wendlingf2a78332011-10-25 01:01:42 +0000[diff] [blame]503<!--
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]504<h3>Polly - Polyhedral optimizations for LLVM</h3>
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]505
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]506<div>
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]507<p>Polly is a project that aims to provide advanced memory access optimizations
508to better take advantage of SIMD units, cache hierarchies, multiple cores or
509even vector accelerators for LLVM. Built around an abstract mathematical
510description based on Z-polyhedra, it provides the infrastructure to develop
511advanced optimizations in LLVM and to connect complex external optimizers. In
512its first year of existence Polly already provides an exact value-based
513dependency analysis as well as basic SIMD and OpenMP code generation support.
514Furthermore, Polly can use PoCC(Pluto) an advanced optimizer for data-locality
515and parallelism.</p>
516</div>
Bill Wendlingf2a78332011-10-25 01:01:42 +0000[diff] [blame]517-->
Chris Lattner75547712010-10-03 23:49:06 +0000[diff] [blame]518
Chris Lattner0fa5da92011-04-06 16:14:25 +0000[diff] [blame]519<!--=========================================================================-->
Bill Wendlingf2a78332011-10-25 01:01:42 +0000[diff] [blame]520<!--
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]521<h3>Rubinius</h3>
Chris Lattner0fa5da92011-04-06 16:14:25 +0000[diff] [blame]522
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]523<div>
Chris Lattner0fa5da92011-04-06 16:14:25 +0000[diff] [blame]524 <p><a href="http://github.com/evanphx/rubinius">Rubinius</a> is an environment
525 for running Ruby code which strives to write as much of the implementation in
526 Ruby as possible. Combined with a bytecode interpreting VM, it uses LLVM to
527 optimize and compile ruby code down to machine code. Techniques such as type
528 feedback, method inlining, and deoptimization are all used to remove dynamism
529 from ruby execution and increase performance.</p>
530</div>
Bill Wendlingf2a78332011-10-25 01:01:42 +0000[diff] [blame]531-->
Chris Lattner0fa5da92011-04-06 16:14:25 +0000[diff] [blame]532
Chris Lattnera844a3e2011-04-07 03:09:21 +0000[diff] [blame]533<!--=========================================================================-->
Bill Wendlingf2a78332011-10-25 01:01:42 +0000[diff] [blame]534<!--
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]535<h3>
Chris Lattnera844a3e2011-04-07 03:09:21 +0000[diff] [blame]536<a name="FAUST">FAUST Real-Time Audio Signal Processing Language</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]537</h3>
Chris Lattnere0518442010-10-01 06:34:49 +0000[diff] [blame]538
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]539<div>
Chris Lattnera844a3e2011-04-07 03:09:21 +0000[diff] [blame]540<p>
541<a href="http://faust.grame.fr">FAUST</a> is a compiled language for real-time
542audio signal processing. The name FAUST stands for Functional AUdio STream. Its
543programming model combines two approaches: functional programming and block
544diagram composition. In addition with the C, C++, JAVA output formats, the
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]545Faust compiler can now generate LLVM bitcode, and works with LLVM 2.7-3.0.</p>
Chris Lattnera844a3e2011-04-07 03:09:21 +0000[diff] [blame]546
547</div>
Bill Wendlingf2a78332011-10-25 01:01:42 +0000[diff] [blame]548-->
Chris Lattnera844a3e2011-04-07 03:09:21 +0000[diff] [blame]549
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]550</div>
551
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]552<!-- *********************************************************************** -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]553<h2>
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]554 <a name="whatsnew">What's New in LLVM 3.0?</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]555</h2>
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]556<!-- *********************************************************************** -->
557
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]558<div>
Chris Lattnerf8e0b4e2008-06-08 22:59:35 +0000[diff] [blame]559
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]560<p>This release includes a huge number of bug fixes, performance tweaks and
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]561minor improvements. Some of the major improvements and new features are listed
562in this section.
Chris Lattnerf8e0b4e2008-06-08 22:59:35 +0000[diff] [blame]563</p>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]564
Chris Lattner914ce462010-04-22 06:28:20 +0000[diff] [blame]565<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]566<h3>
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]567<a name="majorfeatures">Major New Features</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]568</h3>
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]569
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]570<div>
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]571
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]572<p>LLVM 3.0 includes several major new capabilities:</p>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]573
574<ul>
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]575
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]576<!--
577<li></li>
578-->
Chris Lattner7a8e6c52011-04-05 18:38:45 +0000[diff] [blame]579
Chris Lattner8170c102008-02-10 08:18:42 +0000[diff] [blame]580</ul>
Chris Lattner0a6f6d52011-04-05 07:19:28 +0000[diff] [blame]581
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]582</div>
583
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]584<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]585<h3>
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]586<a name="coreimprovements">LLVM IR and Core Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]587</h3>
Chris Lattnerf304ffc2008-02-10 08:17:19 +0000[diff] [blame]588
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]589<div>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]590<p>LLVM IR has several new features for better support of new targets and that
591expose new optimization opportunities:</p>
Chris Lattnerf304ffc2008-02-10 08:17:19 +0000[diff] [blame]592
Chris Lattner791f77b2008-06-05 06:25:56 +0000[diff] [blame]593<ul>
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]594<!--
595<li></li>
596-->
Chris Lattnerf304ffc2008-02-10 08:17:19 +0000[diff] [blame]597</ul>
Mikhail Glushenkovea65d7d2008-10-13 02:08:34 +0000[diff] [blame]598
Chris Lattnerf304ffc2008-02-10 08:17:19 +0000[diff] [blame]599</div>
600
601<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]602<h3>
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]603<a name="optimizer">Optimizer Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]604</h3>
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]605
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]606<div>
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]607
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]608<p>In addition to a large array of minor performance tweaks and bug fixes, this
Chris Lattnerf3013872008-10-13 21:50:36 +0000[diff] [blame]609release includes a few major enhancements and additions to the optimizers:</p>
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]610
611<ul>
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]612<!--
613<li></li>
614-->
Chris Lattnerc5ac61d2011-04-06 05:50:04 +0000[diff] [blame]615</li>
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]616
Chris Lattner11b66112010-10-04 02:42:39 +0000[diff] [blame]617</ul>
618
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]619</div>
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]620
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]621<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]622<h3>
Chris Lattner4ba2b652010-09-30 16:31:33 +0000[diff] [blame]623<a name="mc">MC Level Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]624</h3>
Chris Lattner4ba2b652010-09-30 16:31:33 +0000[diff] [blame]625
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]626<div>
Chris Lattner4ba2b652010-09-30 16:31:33 +0000[diff] [blame]627<p>
Chris Lattner7d9b6b42010-10-02 21:59:30 +0000[diff] [blame]628The LLVM Machine Code (aka MC) subsystem was created to solve a number
Chris Lattner4ba2b652010-09-30 16:31:33 +0000[diff] [blame]629of problems in the realm of assembly, disassembly, object file format handling,
630and a number of other related areas that CPU instruction-set level tools work
Chris Lattner7d9b6b42010-10-02 21:59:30 +0000[diff] [blame]631in.</p>
632
Chris Lattner7d9b6b42010-10-02 21:59:30 +0000[diff] [blame]633<ul>
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]634<!--
635<li></li>
636-->
Chris Lattner7d9b6b42010-10-02 21:59:30 +0000[diff] [blame]637</ul>
638
639<p>For more information, please see the <a
Chris Lattner4ba2b652010-09-30 16:31:33 +0000[diff] [blame]640href="http://blog.llvm.org/2010/04/intro-to-llvm-mc-project.html">Intro to the
641LLVM MC Project Blog Post</a>.
642</p>
643
NAKAMURA Takumi45c435a2011-04-05 08:24:22 +0000[diff] [blame]644</div>
Chris Lattner4ba2b652010-09-30 16:31:33 +0000[diff] [blame]645
Chris Lattner4ba2b652010-09-30 16:31:33 +0000[diff] [blame]646<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]647<h3>
Chris Lattner511433e2009-03-02 03:24:11 +0000[diff] [blame]648<a name="codegen">Target Independent Code Generator Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]649</h3>
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]650
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]651<div>
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]652
Mikhail Glushenkovf795ef02009-03-01 18:09:47 +0000[diff] [blame]653<p>We have put a significant amount of work into the code generator
654infrastructure, which allows us to implement more aggressive algorithms and make
655it run faster:</p>
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]656
657<ul>
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]658<!--
659<li></li>
660-->
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]661</ul>
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]662</div>
663
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]664<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]665<h3>
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]666<a name="x86">X86-32 and X86-64 Target Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]667</h3>
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]668
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]669<div>
Chris Lattner7714c912010-10-04 04:39:25 +0000[diff] [blame]670<p>New features and major changes in the X86 target include:
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]671</p>
672
673<ul>
Chad Rosierf94c9c12011-05-27 20:13:10 +0000[diff] [blame]674<li>The CRC32 intrinsics have been renamed. The intrinsics were previously
675 @llvm.x86.sse42.crc32.[8|16|32] and @llvm.x86.sse42.crc64.[8|64]. They have
676 been renamed to @llvm.x86.sse42.crc32.32.[8|16|32] and
677 @llvm.x86.sse42.crc32.64.[8|64].</li>
678
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]679</ul>
680
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]681</div>
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]682
683<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]684<h3>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]685<a name="ARM">ARM Target Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]686</h3>
Chris Lattnerc441fb82009-03-01 02:30:21 +0000[diff] [blame]687
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]688<div>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]689<p>New features of the ARM target include:
690</p>
Chris Lattnerc441fb82009-03-01 02:30:21 +0000[diff] [blame]691
692<ul>
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]693<!--
694<li></li>
695-->
Bob Wilsone8472772010-09-13 17:39:35 +0000[diff] [blame]696</ul>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]697</div>
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]698
699<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]700<h3>
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]701<a name="OtherTS">Other Target Specific Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]702</h3>
Chris Lattnerc441fb82009-03-01 02:30:21 +0000[diff] [blame]703
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]704<div>
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]705<ul>
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]706<!--
707<li></li>
708-->
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]709</ul>
710</div>
Chris Lattner77d29b12008-06-05 08:02:49 +0000[diff] [blame]711
712<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]713<h3>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]714<a name="changes">Major Changes and Removed Features</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]715</h3>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]716
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]717<div>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]718
Bill Wendling2626dba2011-08-03 22:18:20 +0000[diff] [blame]719<p>If you're already an LLVM user or developer with out-of-tree changes based on
720 LLVM 2.9, this section lists some "gotchas" that you may run into upgrading
721 from the previous release.</p>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]722
723<ul>
Eric Christopher90d6ec52011-09-28 19:47:28 +0000[diff] [blame]724 <li>The <code>LLVMC</code> front end code was removed while separating
725 out language independence.</li>
Jay Foadf42e9b22011-08-04 10:43:43 +0000[diff] [blame]726 <li>The <code>LowerSetJmp</code> pass wasn't used effectively by any
727 target and has been removed.</li>
Rafael Espindolaf940a1a2011-08-30 23:03:45 +0000[diff] [blame]728 <li>The old <code>TailDup</code> pass was not used in the standard pipeline
729 and was unable to update ssa form, so it has been removed.
Eli Friedmanf03bb262011-08-12 22:50:01 +0000[diff] [blame]730 <li>The syntax of volatile loads and stores in IR has been changed to
731 "<code>load volatile</code>"/"<code>store volatile</code>". The old
732 syntax ("<code>volatile load</code>"/"<code>volatile store</code>")
733 is still accepted, but is now considered deprecated.</li>
Devang Patelb34dd132008-10-14 20:03:43 +0000[diff] [blame]734</ul>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]735
NAKAMURA Takumi2026de22011-08-22 23:22:05 +0000[diff] [blame]736<h4>Windows (32-bit)</h4>
737<div>
738<ul>
739 <li>On Win32(MinGW32 and MSVC), Windows 2000 will not be supported.
740 Windows XP or higher is required.</li>
741</ul>
742</div>
743
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]744</div>
745
Daniel Dunbarf0233c62010-10-04 20:11:41 +0000[diff] [blame]746<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]747<h3>
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]748<a name="api_changes">Internal API Changes</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]749</h3>
Daniel Dunbarf0233c62010-10-04 20:11:41 +0000[diff] [blame]750
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]751<div>
Daniel Dunbarf0233c62010-10-04 20:11:41 +0000[diff] [blame]752
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]753<p>In addition, many APIs have changed in this release. Some of the major
Bill Wendling16005252011-08-02 06:20:17 +0000[diff] [blame]754 LLVM API changes are:</p>
Daniel Dunbarf0233c62010-10-04 20:11:41 +0000[diff] [blame]755
756<ul>
Chris Lattnerd1324302011-07-18 04:56:02 +0000[diff] [blame]757<li>The biggest and most pervasive change is that llvm::Type's are no longer
758 returned or accepted as 'const' values. Instead, just pass around non-const
759 Type's.</li>
760
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]761<li><code>PHINode::reserveOperandSpace</code> has been removed. Instead, you
762 must specify how many operands to reserve space for when you create the
763 PHINode, by passing an extra argument into <code>PHINode::Create</code>.</li>
764
765<li>PHINodes no longer store their incoming BasicBlocks as operands. Instead,
766 the list of incoming BasicBlocks is stored separately, and can be accessed
767 with new functions <code>PHINode::block_begin</code>
768 and <code>PHINode::block_end</code>.</li>
769
770<li>Various functions now take an <code>ArrayRef</code> instead of either a pair
771 of pointers (or iterators) to the beginning and end of a range, or a pointer
772 and a length. Others now return an <code>ArrayRef</code> instead of a
773 reference to a <code>SmallVector</code> or <code>std::vector</code>. These
774 include:
775<ul>
776<!-- Please keep this list sorted. -->
Jay Foada3efbb12011-07-15 08:37:34 +0000[diff] [blame]777<li><code>CallInst::Create</code></li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]778<li><code>ComputeLinearIndex</code> (in <code>llvm/CodeGen/Analysis.h</code>)</li>
779<li><code>ConstantArray::get</code></li>
780<li><code>ConstantExpr::getExtractElement</code></li>
Jay Foaddab3d292011-07-21 14:31:17 +0000[diff] [blame]781<li><code>ConstantExpr::getGetElementPtr</code></li>
782<li><code>ConstantExpr::getInBoundsGetElementPtr</code></li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]783<li><code>ConstantExpr::getIndices</code></li>
784<li><code>ConstantExpr::getInsertElement</code></li>
785<li><code>ConstantExpr::getWithOperands</code></li>
Jay Foad1d2f5692011-07-19 13:32:40 +0000[diff] [blame]786<li><code>ConstantFoldCall</code> (in <code>llvm/Analysis/ConstantFolding.h</code>)</li>
787<li><code>ConstantFoldInstOperands</code> (in <code>llvm/Analysis/ConstantFolding.h</code>)</li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]788<li><code>ConstantVector::get</code></li>
789<li><code>DIBuilder::createComplexVariable</code></li>
790<li><code>DIBuilder::getOrCreateArray</code></li>
791<li><code>ExtractValueInst::Create</code></li>
792<li><code>ExtractValueInst::getIndexedType</code></li>
793<li><code>ExtractValueInst::getIndices</code></li>
794<li><code>FindInsertedValue</code> (in <code>llvm/Analysis/ValueTracking.h</code>)</li>
Jay Foadca12a212011-07-19 14:42:50 +0000[diff] [blame]795<li><code>gep_type_begin</code> (in <code>llvm/Support/GetElementPtrTypeIterator.h</code>)</li>
796<li><code>gep_type_end</code> (in <code>llvm/Support/GetElementPtrTypeIterator.h</code>)</li>
Jay Foada9203102011-07-25 09:48:08 +0000[diff] [blame]797<li><code>GetElementPtrInst::Create</code></li>
798<li><code>GetElementPtrInst::CreateInBounds</code></li>
799<li><code>GetElementPtrInst::getIndexedType</code></li>
Jay Foadb60e8512011-07-21 14:42:51 +0000[diff] [blame]800<li><code>InsertValueInst::Create</code></li>
801<li><code>InsertValueInst::getIndices</code></li>
802<li><code>InvokeInst::Create</code></li>
Jay Foada3efbb12011-07-15 08:37:34 +0000[diff] [blame]803<li><code>IRBuilder::CreateCall</code></li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]804<li><code>IRBuilder::CreateExtractValue</code></li>
Jay Foad0a2a60a2011-07-22 08:16:57 +0000[diff] [blame]805<li><code>IRBuilder::CreateGEP</code></li>
806<li><code>IRBuilder::CreateInBoundsGEP</code></li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]807<li><code>IRBuilder::CreateInsertValue</code></li>
Jay Foada3efbb12011-07-15 08:37:34 +0000[diff] [blame]808<li><code>IRBuilder::CreateInvoke</code></li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]809<li><code>MDNode::get</code></li>
810<li><code>MDNode::getIfExists</code></li>
811<li><code>MDNode::getTemporary</code></li>
812<li><code>MDNode::getWhenValsUnresolved</code></li>
Jay Foadb9b54eb2011-07-19 15:07:52 +0000[diff] [blame]813<li><code>SimplifyGEPInst</code> (in <code>llvm/Analysis/InstructionSimplify.h</code>)</li>
Jay Foad8fbbb392011-07-19 14:01:37 +0000[diff] [blame]814<li><code>TargetData::getIndexedOffset</code></li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]815</ul></li>
816
817<li>All forms of <code>StringMap::getOrCreateValue</code> have been remove
818 except for the one which takes a <code>StringRef</code>.</li>
819
Bill Wendling16005252011-08-02 06:20:17 +0000[diff] [blame]820<li>The <code>LLVMBuildUnwind</code> function from the C API was removed. The
821 LLVM <code>unwind</code> instruction has been deprecated for a long time and
Bill Wendling086da7e2011-08-02 06:39:13 +0000[diff] [blame]822 isn't used by the current front-ends. So this was removed during the
Bill Wendling16005252011-08-02 06:20:17 +0000[diff] [blame]823 exception handling rewrite.</li>
824
Bill Wendling2626dba2011-08-03 22:18:20 +0000[diff] [blame]825<li>The <code>LLVMAddLowerSetJmpPass</code> function from the C API was removed
826 because the <code>LowerSetJmp</code> pass was removed.</li>
827
Devang Patel6326a422011-08-15 23:00:00 +0000[diff] [blame]828<li>The <code>DIBuilder</code> interface used by front ends to encode debugging
829 information in the LLVM IR now expects clients to use <code>DIBuilder::finalize()</code>
830 at the end of translation unit to complete debugging information encoding.</li>
831
Torok Edwinf16e2d42011-09-30 13:07:52 +0000[diff] [blame]832<li>The way the type system works has been rewritten: <code>PATypeHolder</code>
833and <code>OpaqueType</code> are gone, and all APIs deal with <code>Type*</code>
834instead of <code>const Type*</code>.
835If you need to create recursive structures, then create a named structure,
836and use <code>setBody()</code> when all its elements are built.
837Type merging and refining is gone too: named structures are not
838merged with other structures, even if their layout is identical.
839(of course anonymous structures are still uniqued by layout).
840</li>
841
842<li>TargetSelect.h moved to Support/ from Target/</li>
843
844<li>UpgradeIntrinsicCall no longer upgrades pre-2.9 intrinsic calls
845(for example <code>llvm.memset.i32</code>).</li>
846
847<li>It is mandatory to initialize all out-of-tree passes too and their dependencies now with
848<code>INITIALIZE_PASS{BEGIN,END,}</code> and <code>INITIALIZE_{PASS,AG}_DEPENDENCY</code>.</li>
849
Eli Friedmanb4141422011-10-13 22:14:57 +0000[diff] [blame]850<li>The interface for MemDepResult in MemoryDependenceAnalysis has been enhanced
851 with new return types Unknown and NonFuncLocal, in addition to the existing
852 types Clobber, Def, and NonLocal.</li>
853
Daniel Dunbarf0233c62010-10-04 20:11:41 +0000[diff] [blame]854</ul>
855</div>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]856
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]857</div>
858
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]859<!-- *********************************************************************** -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]860<h2>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]861 <a name="knownproblems">Known Problems</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]862</h2>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]863<!-- *********************************************************************** -->
864
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]865<div>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]866
Mikhail Glushenkovf795ef02009-03-01 18:09:47 +0000[diff] [blame]867<p>This section contains significant known problems with the LLVM system,
Chris Lattnere18b32e2008-11-10 05:40:34 +0000[diff] [blame]868listed by component. If you run into a problem, please check the <a
Chris Lattnerc463b272005-10-29 07:07:09 +0000[diff] [blame]869href="http://llvm.org/bugs/">LLVM bug database</a> and submit a bug if
Chris Lattner5eccca42003-12-12 21:22:16 +0000[diff] [blame]870there isn't already one.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]871
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]872<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]873<h3>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]874 <a name="experimental">Experimental features included with this release</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]875</h3>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]876
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]877<div>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]878
Misha Brukman6df9e2c2004-05-12 21:46:05 +0000[diff] [blame]879<p>The following components of this LLVM release are either untested, known to
880be broken or unreliable, or are in early development. These components should
881not be relied on, and bugs should not be filed against them, but they may be
882useful to some people. In particular, if you would like to work on one of these
Chris Lattner2b659ef2008-02-12 06:29:45 +0000[diff] [blame]883components, please contact us on the <a
884href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVMdev list</a>.</p>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]885
886<ul>
Dan Gohman3e6157d2011-10-25 00:05:42 +0000[diff] [blame]887<li>The Alpha, CellSPU, MicroBlaze, MSP430, MIPS, PTX,
Chris Lattnerbb117712010-10-04 01:29:06 +0000[diff] [blame]888 and XCore backends are experimental.</li>
Chris Lattner7d9b6b42010-10-02 21:59:30 +0000[diff] [blame]889<li><tt>llc</tt> "<tt>-filetype=obj</tt>" is experimental on all targets
Chris Lattner49123fd2011-04-06 06:29:50 +0000[diff] [blame]890 other than darwin and ELF X86 systems.</li>
Chris Lattnerbe2e1b52011-03-10 07:43:44 +0000[diff] [blame]891
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]892</ul>
893
894</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]895
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]896<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]897<h3>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]898 <a name="x86-be">Known problems with the X86 back-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]899</h3>
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]900
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]901<div>
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]902
903<ul>
Anton Korobeynikova6094be2008-06-08 10:24:13 +0000[diff] [blame]904 <li>The X86 backend does not yet support
905 all <a href="http://llvm.org/PR879">inline assembly that uses the X86
906 floating point stack</a>. It supports the 'f' and 't' constraints, but not
907 'u'.</li>
Dan Gohman8207ba92008-06-08 23:05:11 +0000[diff] [blame]908 <li>The X86-64 backend does not yet support the LLVM IR instruction
Chris Lattner914ce462010-04-22 06:28:20 +0000[diff] [blame]909 <tt>va_arg</tt>. Currently, front-ends support variadic
Dan Gohman8207ba92008-06-08 23:05:11 +0000[diff] [blame]910 argument constructs on X86-64 by lowering them manually.</li>
NAKAMURA Takumi45c435a2011-04-05 08:24:22 +0000[diff] [blame]911 <li>Windows x64 (aka Win64) code generator has a few issues.
912 <ul>
913 <li>llvm-gcc cannot build the mingw-w64 runtime currently
914 due to lack of support for the 'u' inline assembly
915 constraint and for X87 floating point inline assembly.</li>
916 <li>On mingw-w64, you will see unresolved symbol <tt>__chkstk</tt>
917 due to <a href="http://llvm.org/bugs/show_bug.cgi?id=8919">Bug 8919</a>.
918 It is fixed in <a href="http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20110321/118499.html">r128206</a>.</li>
919 <li>Miss-aligned MOVDQA might crash your program. It is due to
920 <a href="http://llvm.org/bugs/show_bug.cgi?id=9483">Bug 9483</a>,
921 lack of handling aligned internal globals.</li>
922 </ul>
923 </li>
924
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]925</ul>
926
927</div>
928
929<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]930<h3>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]931 <a name="ppc-be">Known problems with the PowerPC back-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]932</h3>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]933
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]934<div>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]935
936<ul>
Nicolas Geoffraye4285dc2007-05-15 09:21:28 +0000[diff] [blame]937<li>The Linux PPC32/ABI support needs testing for the interpreter and static
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]938compilation, and lacks support for debug information.</li>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]939</ul>
940
941</div>
942
943<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]944<h3>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]945 <a name="arm-be">Known problems with the ARM back-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]946</h3>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]947
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]948<div>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]949
950<ul>
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]951<li>Thumb mode works only on ARMv6 or higher processors. On sub-ARMv6
Duncan Sandsc90d68b2007-09-26 15:59:54 +0000[diff] [blame]952processors, thumb programs can crash or produce wrong
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]953results (<a href="http://llvm.org/PR1388">PR1388</a>).</li>
John Criswell524a5dd2009-03-02 15:28:15 +0000[diff] [blame]954<li>Compilation for ARM Linux OABI (old ABI) is supported but not fully tested.
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]955</li>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]956</ul>
957
958</div>
959
960<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]961<h3>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]962 <a name="sparc-be">Known problems with the SPARC back-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]963</h3>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]964
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]965<div>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]966
967<ul>
John Criswell524a5dd2009-03-02 15:28:15 +0000[diff] [blame]968<li>The SPARC backend only supports the 32-bit SPARC ABI (-m32); it does not
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]969 support the 64-bit SPARC ABI (-m64).</li>
970</ul>
971
972</div>
973
974<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]975<h3>
Bruno Cardoso Lopesb7e1a4f2008-10-25 14:56:26 +0000[diff] [blame]976 <a name="mips-be">Known problems with the MIPS back-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]977</h3>
Bruno Cardoso Lopesb7e1a4f2008-10-25 14:56:26 +0000[diff] [blame]978
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]979<div>
Bruno Cardoso Lopesb7e1a4f2008-10-25 14:56:26 +0000[diff] [blame]980
981<ul>
Bruno Cardoso Lopesb7e1a4f2008-10-25 14:56:26 +0000[diff] [blame]982<li>64-bit MIPS targets are not supported yet.</li>
983</ul>
984
985</div>
986
987<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]988<h3>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]989 <a name="alpha-be">Known problems with the Alpha back-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]990</h3>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]991
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]992<div>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]993
994<ul>
995
996<li>On 21164s, some rare FP arithmetic sequences which may trap do not have the
997appropriate nops inserted to ensure restartability.</li>
998
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]999</ul>
1000</div>
1001
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1002<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1003<h3>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]1004 <a name="c-be">Known problems with the C back-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1005</h3>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1006
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1007<div>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1008
Chris Lattner3016ee92010-09-29 05:34:42 +0000[diff] [blame]1009<p>The C backend has numerous problems and is not being actively maintained.
1010Depending on it for anything serious is not advised.</p>
1011
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1012<ul>
Chris Lattner5733b272008-06-05 06:35:40 +0000[diff] [blame]1013<li><a href="http://llvm.org/PR802">The C backend has only basic support for
1014 inline assembly code</a>.</li>
Chris Lattner725a0d82007-09-26 06:01:35 +0000[diff] [blame]1015<li><a href="http://llvm.org/PR1658">The C backend violates the ABI of common
1016 C++ programs</a>, preventing intermixing between C++ compiled by the CBE and
Gabor Greif4906abe2009-03-02 12:02:51 +0000[diff] [blame]1017 C++ code compiled with <tt>llc</tt> or native compilers.</li>
Duncan Sandsf74c0cc2008-02-10 13:40:55 +0000[diff] [blame]1018<li>The C backend does not support all exception handling constructs.</li>
Duncan Sands50723a92009-02-25 11:51:54 +0000[diff] [blame]1019<li>The C backend does not support arbitrary precision integers.</li>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1020</ul>
1021
1022</div>
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]1023
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1024
1025<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1026<h3>
Chris Lattner3016ee92010-09-29 05:34:42 +0000[diff] [blame]1027 <a name="llvm-gcc">Known problems with the llvm-gcc front-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1028</h3>
Chris Lattner47588f92003-10-02 05:07:23 +0000[diff] [blame]1029
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1030<div>
Chris Lattnerc5d658a2006-03-03 00:34:26 +0000[diff] [blame]1031
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]1032<p><b>LLVM 3.0 will be the last release of llvm-gcc.</b></p>
Chris Lattner49123fd2011-04-06 06:29:50 +0000[diff] [blame]1033
Chris Lattner3016ee92010-09-29 05:34:42 +0000[diff] [blame]1034<p>llvm-gcc is generally very stable for the C family of languages. The only
1035 major language feature of GCC not supported by llvm-gcc is the
1036 <tt>__builtin_apply</tt> family of builtins. However, some extensions
1037 are only supported on some targets. For example, trampolines are only
1038 supported on some targets (these are used when you take the address of a
1039 nested function).</p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1040
Chris Lattner3016ee92010-09-29 05:34:42 +0000[diff] [blame]1041<p>Fortran support generally works, but there are still several unresolved bugs
1042 in <a href="http://llvm.org/bugs/">Bugzilla</a>. Please see the
1043 tools/gfortran component for details. Note that llvm-gcc is missing major
1044 Fortran performance work in the frontend and library that went into GCC after
1045 4.2. If you are interested in Fortran, we recommend that you consider using
1046 <a href="#dragonegg">dragonegg</a> instead.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1047
Duncan Sands3af96332010-10-04 10:06:56 +0000[diff] [blame]1048<p>The llvm-gcc 4.2 Ada compiler has basic functionality, but is no longer being
1049actively maintained. If you are interested in Ada, we recommend that you
1050consider using <a href="#dragonegg">dragonegg</a> instead.</p>
Chris Lattner2b659ef2008-02-12 06:29:45 +0000[diff] [blame]1051</div>
1052
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1053</div>
1054
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1055<!-- *********************************************************************** -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1056<h2>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1057 <a name="additionalinfo">Additional Information</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1058</h2>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1059<!-- *********************************************************************** -->
1060
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1061<div>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1062
Chris Lattner416db102005-05-16 17:13:10 +0000[diff] [blame]1063<p>A wide variety of additional information is available on the <a
NAKAMURA Takumib9a33632011-04-09 02:13:37 +0000[diff] [blame]1064href="http://llvm.org/">LLVM web page</a>, in particular in the <a
Chris Lattnerb4b0ce72007-05-18 00:44:29 +0000[diff] [blame]1065href="http://llvm.org/docs/">documentation</a> section. The web page also
Reid Spencer669ed452007-07-09 08:04:31 +0000[diff] [blame]1066contains versions of the API documentation which is up-to-date with the
1067Subversion version of the source code.
Misha Brukman109d9e82005-03-30 19:14:24 +0000[diff] [blame]1068You can access versions of these documents specific to this release by going
1069into the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1070
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1071<p>If you have any questions or comments about LLVM, please feel free to contact
Chris Lattnerc463b272005-10-29 07:07:09 +0000[diff] [blame]1072us via the <a href="http://llvm.org/docs/#maillist"> mailing
Chris Lattner5eccca42003-12-12 21:22:16 +0000[diff] [blame]1073lists</a>.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1074
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1075</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1076
1077<!-- *********************************************************************** -->
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1078
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1079<hr>
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]1080<address>
Misha Brukman38847d52003-12-21 22:53:21 +0000[diff] [blame]1081 <a href="http://jigsaw.w3.org/css-validator/check/referer"><img
Misha Brukman44408702008-12-11 17:34:48 +0000[diff] [blame]1082 src="http://jigsaw.w3.org/css-validator/images/vcss-blue" alt="Valid CSS"></a>
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]1083 <a href="http://validator.w3.org/check/referer"><img
Misha Brukman44408702008-12-11 17:34:48 +0000[diff] [blame]1084 src="http://www.w3.org/Icons/valid-html401-blue" alt="Valid HTML 4.01"></a>
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]1085
Chris Lattnerb4b0ce72007-05-18 00:44:29 +0000[diff] [blame]1086 <a href="http://llvm.org/">LLVM Compiler Infrastructure</a><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1087 Last modified: $Date$
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]1088</address>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1089
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1090</body>
1091</html>