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gerrit-public.fairphone.software / fp2-dev / platform / external / llvm / 3e6157de576e349d33a9b08d103405b3a8fb9159 / . / 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<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]287<h3>Crack Programming Language</h3>
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]288
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]289<div>
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]290<p>
291<a href="http://code.google.com/p/crack-language/">Crack</a> aims to provide the
292ease of development of a scripting language with the performance of a compiled
293language. The language derives concepts from C++, Java and Python, incorporating
294object-oriented programming, operator overloading and strong typing.</p>
295</div>
296
297
298<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]299<h3>TTA-based Codesign Environment (TCE)</h3>
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]300
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]301<div>
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]302<p>TCE is a toolset for designing application-specific processors (ASP) based on
303the Transport triggered architecture (TTA). The toolset provides a complete
304co-design flow from C/C++ programs down to synthesizable VHDL and parallel
305program binaries. Processor customization points include the register files,
306function units, supported operations, and the interconnection network.</p>
307
308<p>TCE uses Clang and LLVM for C/C++ language support, target independent
309optimizations and also for parts of code generation. It generates new LLVM-based
310code generators "on the fly" for the designed TTA processors and loads them in
311to the compiler backend as runtime libraries to avoid per-target recompilation
312of larger parts of the compiler chain.</p>
313</div>
314
315
316
317<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]318<h3>PinaVM</h3>
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]319
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]320<div>
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]321<p><a href="http://gitorious.org/pinavm/pages/Home">PinaVM</a> is an open
322source, <a href="http://www.systemc.org/">SystemC</a> front-end. Unlike many
323other front-ends, PinaVM actually executes the elaboration of the
324program analyzed using LLVM's JIT infrastructure. It later enriches the
325bitcode with SystemC-specific information.</p>
326</div>
327
328<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]329<h3>Pure</h3>
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]330
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]331<div>
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]332<p><a href="http://pure-lang.googlecode.com/">Pure</a> is an
333 algebraic/functional
334 programming language based on term rewriting. Programs are collections
335 of equations which are used to evaluate expressions in a symbolic
336 fashion. The interpreter uses LLVM as a backend to JIT-compile Pure
337 programs to fast native code. Pure offers dynamic typing, eager and lazy
338 evaluation, lexical closures, a hygienic macro system (also based on
339 term rewriting), built-in list and matrix support (including list and
340 matrix comprehensions) and an easy-to-use interface to C and other
341 programming languages (including the ability to load LLVM bitcode
342 modules, and inline C, C++, Fortran and Faust code in Pure programs if
343 the corresponding LLVM-enabled compilers are installed).</p>
344
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]345<p>Pure version 0.47 has been tested and is known to work with LLVM 3.0
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]346 (and continues to work with older LLVM releases &gt;= 2.5).</p>
347</div>
348
349<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]350<h3 id="icedtea">IcedTea Java Virtual Machine Implementation</h3>
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]351
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]352<div>
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]353<p>
354<a href="http://icedtea.classpath.org/wiki/Main_Page">IcedTea</a> provides a
355harness to build OpenJDK using only free software build tools and to provide
356replacements for the not-yet free parts of OpenJDK. One of the extensions that
357IcedTea provides is a new JIT compiler named <a
358href="http://icedtea.classpath.org/wiki/ZeroSharkFaq">Shark</a> which uses LLVM
359to provide native code generation without introducing processor-dependent
360code.
361</p>
362
363<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]364and 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]365releases &gt;= 2.6 as well).</p>
366</div>
367
368<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]369<h3>Glasgow Haskell Compiler (GHC)</h3>
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]370
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]371<div>
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]372<p>GHC is an open source, state-of-the-art programming suite for Haskell,
373a standard lazy functional programming language. It includes an
374optimizing static compiler generating good code for a variety of
375platforms, together with an interactive system for convenient, quick
376development.</p>
377
378<p>In addition to the existing C and native code generators, GHC 7.0 now
379supports an LLVM code generator. GHC supports LLVM 2.7 and later.</p>
380</div>
381
382<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]383<h3>Polly - Polyhedral optimizations for LLVM</h3>
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]384
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]385<div>
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]386<p>Polly is a project that aims to provide advanced memory access optimizations
387to better take advantage of SIMD units, cache hierarchies, multiple cores or
388even vector accelerators for LLVM. Built around an abstract mathematical
389description based on Z-polyhedra, it provides the infrastructure to develop
390advanced optimizations in LLVM and to connect complex external optimizers. In
391its first year of existence Polly already provides an exact value-based
392dependency analysis as well as basic SIMD and OpenMP code generation support.
393Furthermore, Polly can use PoCC(Pluto) an advanced optimizer for data-locality
394and parallelism.</p>
395</div>
Chris Lattner75547712010-10-03 23:49:06 +0000[diff] [blame]396
Chris Lattner0fa5da92011-04-06 16:14:25 +0000[diff] [blame]397<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]398<h3>Rubinius</h3>
Chris Lattner0fa5da92011-04-06 16:14:25 +0000[diff] [blame]399
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]400<div>
Chris Lattner0fa5da92011-04-06 16:14:25 +0000[diff] [blame]401 <p><a href="http://github.com/evanphx/rubinius">Rubinius</a> is an environment
402 for running Ruby code which strives to write as much of the implementation in
403 Ruby as possible. Combined with a bytecode interpreting VM, it uses LLVM to
404 optimize and compile ruby code down to machine code. Techniques such as type
405 feedback, method inlining, and deoptimization are all used to remove dynamism
406 from ruby execution and increase performance.</p>
407</div>
408
409
Chris Lattnera844a3e2011-04-07 03:09:21 +0000[diff] [blame]410<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]411<h3>
Chris Lattnera844a3e2011-04-07 03:09:21 +0000[diff] [blame]412<a name="FAUST">FAUST Real-Time Audio Signal Processing Language</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]413</h3>
Chris Lattnere0518442010-10-01 06:34:49 +0000[diff] [blame]414
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]415<div>
Chris Lattnera844a3e2011-04-07 03:09:21 +0000[diff] [blame]416<p>
417<a href="http://faust.grame.fr">FAUST</a> is a compiled language for real-time
418audio signal processing. The name FAUST stands for Functional AUdio STream. Its
419programming model combines two approaches: functional programming and block
420diagram composition. In addition with the C, C++, JAVA output formats, the
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]421Faust 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]422
423</div>
424
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]425</div>
426
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]427<!-- *********************************************************************** -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]428<h2>
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]429 <a name="whatsnew">What's New in LLVM 3.0?</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]430</h2>
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]431<!-- *********************************************************************** -->
432
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]433<div>
Chris Lattnerf8e0b4e2008-06-08 22:59:35 +0000[diff] [blame]434
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]435<p>This release includes a huge number of bug fixes, performance tweaks and
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]436minor improvements. Some of the major improvements and new features are listed
437in this section.
Chris Lattnerf8e0b4e2008-06-08 22:59:35 +0000[diff] [blame]438</p>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]439
Chris Lattner914ce462010-04-22 06:28:20 +0000[diff] [blame]440<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]441<h3>
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]442<a name="majorfeatures">Major New Features</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]443</h3>
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]444
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]445<div>
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]446
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]447<p>LLVM 3.0 includes several major new capabilities:</p>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]448
449<ul>
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]450
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]451<!--
452<li></li>
453-->
Chris Lattner7a8e6c52011-04-05 18:38:45 +0000[diff] [blame]454
Chris Lattner8170c102008-02-10 08:18:42 +0000[diff] [blame]455</ul>
Chris Lattner0a6f6d52011-04-05 07:19:28 +0000[diff] [blame]456
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]457</div>
458
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]459<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]460<h3>
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]461<a name="coreimprovements">LLVM IR and Core Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]462</h3>
Chris Lattnerf304ffc2008-02-10 08:17:19 +0000[diff] [blame]463
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]464<div>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]465<p>LLVM IR has several new features for better support of new targets and that
466expose new optimization opportunities:</p>
Chris Lattnerf304ffc2008-02-10 08:17:19 +0000[diff] [blame]467
Chris Lattner791f77b2008-06-05 06:25:56 +0000[diff] [blame]468<ul>
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]469<!--
470<li></li>
471-->
Chris Lattnerf304ffc2008-02-10 08:17:19 +0000[diff] [blame]472</ul>
Mikhail Glushenkovea65d7d2008-10-13 02:08:34 +0000[diff] [blame]473
Chris Lattnerf304ffc2008-02-10 08:17:19 +0000[diff] [blame]474</div>
475
476<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]477<h3>
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]478<a name="optimizer">Optimizer Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]479</h3>
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]480
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]481<div>
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]482
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]483<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]484release includes a few major enhancements and additions to the optimizers:</p>
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]485
486<ul>
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]487<!--
488<li></li>
489-->
Chris Lattnerc5ac61d2011-04-06 05:50:04 +0000[diff] [blame]490</li>
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]491
Chris Lattner11b66112010-10-04 02:42:39 +0000[diff] [blame]492</ul>
493
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]494</div>
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]495
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]496<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]497<h3>
Chris Lattner4ba2b652010-09-30 16:31:33 +0000[diff] [blame]498<a name="mc">MC Level Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]499</h3>
Chris Lattner4ba2b652010-09-30 16:31:33 +0000[diff] [blame]500
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]501<div>
Chris Lattner4ba2b652010-09-30 16:31:33 +0000[diff] [blame]502<p>
Chris Lattner7d9b6b42010-10-02 21:59:30 +0000[diff] [blame]503The LLVM Machine Code (aka MC) subsystem was created to solve a number
Chris Lattner4ba2b652010-09-30 16:31:33 +0000[diff] [blame]504of problems in the realm of assembly, disassembly, object file format handling,
505and a number of other related areas that CPU instruction-set level tools work
Chris Lattner7d9b6b42010-10-02 21:59:30 +0000[diff] [blame]506in.</p>
507
Chris Lattner7d9b6b42010-10-02 21:59:30 +0000[diff] [blame]508<ul>
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]509<!--
510<li></li>
511-->
Chris Lattner7d9b6b42010-10-02 21:59:30 +0000[diff] [blame]512</ul>
513
514<p>For more information, please see the <a
Chris Lattner4ba2b652010-09-30 16:31:33 +0000[diff] [blame]515href="http://blog.llvm.org/2010/04/intro-to-llvm-mc-project.html">Intro to the
516LLVM MC Project Blog Post</a>.
517</p>
518
NAKAMURA Takumi45c435a2011-04-05 08:24:22 +0000[diff] [blame]519</div>
Chris Lattner4ba2b652010-09-30 16:31:33 +0000[diff] [blame]520
Chris Lattner4ba2b652010-09-30 16:31:33 +0000[diff] [blame]521<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]522<h3>
Chris Lattner511433e2009-03-02 03:24:11 +0000[diff] [blame]523<a name="codegen">Target Independent Code Generator Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]524</h3>
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]525
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]526<div>
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]527
Mikhail Glushenkovf795ef02009-03-01 18:09:47 +0000[diff] [blame]528<p>We have put a significant amount of work into the code generator
529infrastructure, which allows us to implement more aggressive algorithms and make
530it run faster:</p>
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]531
532<ul>
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]533<!--
534<li></li>
535-->
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]536</ul>
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]537</div>
538
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]539<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]540<h3>
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]541<a name="x86">X86-32 and X86-64 Target Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]542</h3>
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]543
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]544<div>
Chris Lattner7714c912010-10-04 04:39:25 +0000[diff] [blame]545<p>New features and major changes in the X86 target include:
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]546</p>
547
548<ul>
Chad Rosierf94c9c12011-05-27 20:13:10 +0000[diff] [blame]549<li>The CRC32 intrinsics have been renamed. The intrinsics were previously
550 @llvm.x86.sse42.crc32.[8|16|32] and @llvm.x86.sse42.crc64.[8|64]. They have
551 been renamed to @llvm.x86.sse42.crc32.32.[8|16|32] and
552 @llvm.x86.sse42.crc32.64.[8|64].</li>
553
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]554</ul>
555
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]556</div>
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]557
558<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]559<h3>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]560<a name="ARM">ARM Target Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]561</h3>
Chris Lattnerc441fb82009-03-01 02:30:21 +0000[diff] [blame]562
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]563<div>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]564<p>New features of the ARM target include:
565</p>
Chris Lattnerc441fb82009-03-01 02:30:21 +0000[diff] [blame]566
567<ul>
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]568<!--
569<li></li>
570-->
Bob Wilsone8472772010-09-13 17:39:35 +0000[diff] [blame]571</ul>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]572</div>
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]573
574<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]575<h3>
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]576<a name="OtherTS">Other Target Specific Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]577</h3>
Chris Lattnerc441fb82009-03-01 02:30:21 +0000[diff] [blame]578
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]579<div>
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]580<ul>
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]581<!--
582<li></li>
583-->
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]584</ul>
585</div>
Chris Lattner77d29b12008-06-05 08:02:49 +0000[diff] [blame]586
587<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]588<h3>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]589<a name="changes">Major Changes and Removed Features</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]590</h3>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]591
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]592<div>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]593
Bill Wendling2626dba2011-08-03 22:18:20 +0000[diff] [blame]594<p>If you're already an LLVM user or developer with out-of-tree changes based on
595 LLVM 2.9, this section lists some "gotchas" that you may run into upgrading
596 from the previous release.</p>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]597
598<ul>
Eric Christopher90d6ec52011-09-28 19:47:28 +0000[diff] [blame]599 <li>The <code>LLVMC</code> front end code was removed while separating
600 out language independence.</li>
Jay Foadf42e9b22011-08-04 10:43:43 +0000[diff] [blame]601 <li>The <code>LowerSetJmp</code> pass wasn't used effectively by any
602 target and has been removed.</li>
Rafael Espindolaf940a1a2011-08-30 23:03:45 +0000[diff] [blame]603 <li>The old <code>TailDup</code> pass was not used in the standard pipeline
604 and was unable to update ssa form, so it has been removed.
Eli Friedmanf03bb262011-08-12 22:50:01 +0000[diff] [blame]605 <li>The syntax of volatile loads and stores in IR has been changed to
606 "<code>load volatile</code>"/"<code>store volatile</code>". The old
607 syntax ("<code>volatile load</code>"/"<code>volatile store</code>")
608 is still accepted, but is now considered deprecated.</li>
Devang Patelb34dd132008-10-14 20:03:43 +0000[diff] [blame]609</ul>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]610
NAKAMURA Takumi2026de22011-08-22 23:22:05 +0000[diff] [blame]611<h4>Windows (32-bit)</h4>
612<div>
613<ul>
614 <li>On Win32(MinGW32 and MSVC), Windows 2000 will not be supported.
615 Windows XP or higher is required.</li>
616</ul>
617</div>
618
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]619</div>
620
Daniel Dunbarf0233c62010-10-04 20:11:41 +0000[diff] [blame]621<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]622<h3>
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]623<a name="api_changes">Internal API Changes</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]624</h3>
Daniel Dunbarf0233c62010-10-04 20:11:41 +0000[diff] [blame]625
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]626<div>
Daniel Dunbarf0233c62010-10-04 20:11:41 +0000[diff] [blame]627
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]628<p>In addition, many APIs have changed in this release. Some of the major
Bill Wendling16005252011-08-02 06:20:17 +0000[diff] [blame]629 LLVM API changes are:</p>
Daniel Dunbarf0233c62010-10-04 20:11:41 +0000[diff] [blame]630
631<ul>
Chris Lattnerd1324302011-07-18 04:56:02 +0000[diff] [blame]632<li>The biggest and most pervasive change is that llvm::Type's are no longer
633 returned or accepted as 'const' values. Instead, just pass around non-const
634 Type's.</li>
635
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]636<li><code>PHINode::reserveOperandSpace</code> has been removed. Instead, you
637 must specify how many operands to reserve space for when you create the
638 PHINode, by passing an extra argument into <code>PHINode::Create</code>.</li>
639
640<li>PHINodes no longer store their incoming BasicBlocks as operands. Instead,
641 the list of incoming BasicBlocks is stored separately, and can be accessed
642 with new functions <code>PHINode::block_begin</code>
643 and <code>PHINode::block_end</code>.</li>
644
645<li>Various functions now take an <code>ArrayRef</code> instead of either a pair
646 of pointers (or iterators) to the beginning and end of a range, or a pointer
647 and a length. Others now return an <code>ArrayRef</code> instead of a
648 reference to a <code>SmallVector</code> or <code>std::vector</code>. These
649 include:
650<ul>
651<!-- Please keep this list sorted. -->
Jay Foada3efbb12011-07-15 08:37:34 +0000[diff] [blame]652<li><code>CallInst::Create</code></li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]653<li><code>ComputeLinearIndex</code> (in <code>llvm/CodeGen/Analysis.h</code>)</li>
654<li><code>ConstantArray::get</code></li>
655<li><code>ConstantExpr::getExtractElement</code></li>
Jay Foaddab3d292011-07-21 14:31:17 +0000[diff] [blame]656<li><code>ConstantExpr::getGetElementPtr</code></li>
657<li><code>ConstantExpr::getInBoundsGetElementPtr</code></li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]658<li><code>ConstantExpr::getIndices</code></li>
659<li><code>ConstantExpr::getInsertElement</code></li>
660<li><code>ConstantExpr::getWithOperands</code></li>
Jay Foad1d2f5692011-07-19 13:32:40 +0000[diff] [blame]661<li><code>ConstantFoldCall</code> (in <code>llvm/Analysis/ConstantFolding.h</code>)</li>
662<li><code>ConstantFoldInstOperands</code> (in <code>llvm/Analysis/ConstantFolding.h</code>)</li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]663<li><code>ConstantVector::get</code></li>
664<li><code>DIBuilder::createComplexVariable</code></li>
665<li><code>DIBuilder::getOrCreateArray</code></li>
666<li><code>ExtractValueInst::Create</code></li>
667<li><code>ExtractValueInst::getIndexedType</code></li>
668<li><code>ExtractValueInst::getIndices</code></li>
669<li><code>FindInsertedValue</code> (in <code>llvm/Analysis/ValueTracking.h</code>)</li>
Jay Foadca12a212011-07-19 14:42:50 +0000[diff] [blame]670<li><code>gep_type_begin</code> (in <code>llvm/Support/GetElementPtrTypeIterator.h</code>)</li>
671<li><code>gep_type_end</code> (in <code>llvm/Support/GetElementPtrTypeIterator.h</code>)</li>
Jay Foada9203102011-07-25 09:48:08 +0000[diff] [blame]672<li><code>GetElementPtrInst::Create</code></li>
673<li><code>GetElementPtrInst::CreateInBounds</code></li>
674<li><code>GetElementPtrInst::getIndexedType</code></li>
Jay Foadb60e8512011-07-21 14:42:51 +0000[diff] [blame]675<li><code>InsertValueInst::Create</code></li>
676<li><code>InsertValueInst::getIndices</code></li>
677<li><code>InvokeInst::Create</code></li>
Jay Foada3efbb12011-07-15 08:37:34 +0000[diff] [blame]678<li><code>IRBuilder::CreateCall</code></li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]679<li><code>IRBuilder::CreateExtractValue</code></li>
Jay Foad0a2a60a2011-07-22 08:16:57 +0000[diff] [blame]680<li><code>IRBuilder::CreateGEP</code></li>
681<li><code>IRBuilder::CreateInBoundsGEP</code></li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]682<li><code>IRBuilder::CreateInsertValue</code></li>
Jay Foada3efbb12011-07-15 08:37:34 +0000[diff] [blame]683<li><code>IRBuilder::CreateInvoke</code></li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]684<li><code>MDNode::get</code></li>
685<li><code>MDNode::getIfExists</code></li>
686<li><code>MDNode::getTemporary</code></li>
687<li><code>MDNode::getWhenValsUnresolved</code></li>
Jay Foadb9b54eb2011-07-19 15:07:52 +0000[diff] [blame]688<li><code>SimplifyGEPInst</code> (in <code>llvm/Analysis/InstructionSimplify.h</code>)</li>
Jay Foad8fbbb392011-07-19 14:01:37 +0000[diff] [blame]689<li><code>TargetData::getIndexedOffset</code></li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]690</ul></li>
691
692<li>All forms of <code>StringMap::getOrCreateValue</code> have been remove
693 except for the one which takes a <code>StringRef</code>.</li>
694
Bill Wendling16005252011-08-02 06:20:17 +0000[diff] [blame]695<li>The <code>LLVMBuildUnwind</code> function from the C API was removed. The
696 LLVM <code>unwind</code> instruction has been deprecated for a long time and
Bill Wendling086da7e2011-08-02 06:39:13 +0000[diff] [blame]697 isn't used by the current front-ends. So this was removed during the
Bill Wendling16005252011-08-02 06:20:17 +0000[diff] [blame]698 exception handling rewrite.</li>
699
Bill Wendling2626dba2011-08-03 22:18:20 +0000[diff] [blame]700<li>The <code>LLVMAddLowerSetJmpPass</code> function from the C API was removed
701 because the <code>LowerSetJmp</code> pass was removed.</li>
702
Devang Patel6326a422011-08-15 23:00:00 +0000[diff] [blame]703<li>The <code>DIBuilder</code> interface used by front ends to encode debugging
704 information in the LLVM IR now expects clients to use <code>DIBuilder::finalize()</code>
705 at the end of translation unit to complete debugging information encoding.</li>
706
Torok Edwinf16e2d42011-09-30 13:07:52 +0000[diff] [blame]707<li>The way the type system works has been rewritten: <code>PATypeHolder</code>
708and <code>OpaqueType</code> are gone, and all APIs deal with <code>Type*</code>
709instead of <code>const Type*</code>.
710If you need to create recursive structures, then create a named structure,
711and use <code>setBody()</code> when all its elements are built.
712Type merging and refining is gone too: named structures are not
713merged with other structures, even if their layout is identical.
714(of course anonymous structures are still uniqued by layout).
715</li>
716
717<li>TargetSelect.h moved to Support/ from Target/</li>
718
719<li>UpgradeIntrinsicCall no longer upgrades pre-2.9 intrinsic calls
720(for example <code>llvm.memset.i32</code>).</li>
721
722<li>It is mandatory to initialize all out-of-tree passes too and their dependencies now with
723<code>INITIALIZE_PASS{BEGIN,END,}</code> and <code>INITIALIZE_{PASS,AG}_DEPENDENCY</code>.</li>
724
Eli Friedmanb4141422011-10-13 22:14:57 +0000[diff] [blame]725<li>The interface for MemDepResult in MemoryDependenceAnalysis has been enhanced
726 with new return types Unknown and NonFuncLocal, in addition to the existing
727 types Clobber, Def, and NonLocal.</li>
728
Daniel Dunbarf0233c62010-10-04 20:11:41 +0000[diff] [blame]729</ul>
730</div>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]731
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]732</div>
733
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]734<!-- *********************************************************************** -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]735<h2>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]736 <a name="knownproblems">Known Problems</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]737</h2>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]738<!-- *********************************************************************** -->
739
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]740<div>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]741
Mikhail Glushenkovf795ef02009-03-01 18:09:47 +0000[diff] [blame]742<p>This section contains significant known problems with the LLVM system,
Chris Lattnere18b32e2008-11-10 05:40:34 +0000[diff] [blame]743listed by component. If you run into a problem, please check the <a
Chris Lattnerc463b272005-10-29 07:07:09 +0000[diff] [blame]744href="http://llvm.org/bugs/">LLVM bug database</a> and submit a bug if
Chris Lattner5eccca42003-12-12 21:22:16 +0000[diff] [blame]745there isn't already one.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]746
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]747<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]748<h3>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]749 <a name="experimental">Experimental features included with this release</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]750</h3>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]751
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]752<div>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]753
Misha Brukman6df9e2c2004-05-12 21:46:05 +0000[diff] [blame]754<p>The following components of this LLVM release are either untested, known to
755be broken or unreliable, or are in early development. These components should
756not be relied on, and bugs should not be filed against them, but they may be
757useful 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]758components, please contact us on the <a
759href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVMdev list</a>.</p>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]760
761<ul>
Dan Gohman3e6157d2011-10-25 00:05:42 +0000[diff] [blame^]762<li>The Alpha, CellSPU, MicroBlaze, MSP430, MIPS, PTX,
Chris Lattnerbb117712010-10-04 01:29:06 +0000[diff] [blame]763 and XCore backends are experimental.</li>
Chris Lattner7d9b6b42010-10-02 21:59:30 +0000[diff] [blame]764<li><tt>llc</tt> "<tt>-filetype=obj</tt>" is experimental on all targets
Chris Lattner49123fd2011-04-06 06:29:50 +0000[diff] [blame]765 other than darwin and ELF X86 systems.</li>
Chris Lattnerbe2e1b52011-03-10 07:43:44 +0000[diff] [blame]766
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]767</ul>
768
769</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]770
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]771<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]772<h3>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]773 <a name="x86-be">Known problems with the X86 back-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]774</h3>
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]775
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]776<div>
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]777
778<ul>
Anton Korobeynikova6094be2008-06-08 10:24:13 +0000[diff] [blame]779 <li>The X86 backend does not yet support
780 all <a href="http://llvm.org/PR879">inline assembly that uses the X86
781 floating point stack</a>. It supports the 'f' and 't' constraints, but not
782 'u'.</li>
Dan Gohman8207ba92008-06-08 23:05:11 +0000[diff] [blame]783 <li>The X86-64 backend does not yet support the LLVM IR instruction
Chris Lattner914ce462010-04-22 06:28:20 +0000[diff] [blame]784 <tt>va_arg</tt>. Currently, front-ends support variadic
Dan Gohman8207ba92008-06-08 23:05:11 +0000[diff] [blame]785 argument constructs on X86-64 by lowering them manually.</li>
NAKAMURA Takumi45c435a2011-04-05 08:24:22 +0000[diff] [blame]786 <li>Windows x64 (aka Win64) code generator has a few issues.
787 <ul>
788 <li>llvm-gcc cannot build the mingw-w64 runtime currently
789 due to lack of support for the 'u' inline assembly
790 constraint and for X87 floating point inline assembly.</li>
791 <li>On mingw-w64, you will see unresolved symbol <tt>__chkstk</tt>
792 due to <a href="http://llvm.org/bugs/show_bug.cgi?id=8919">Bug 8919</a>.
793 It is fixed in <a href="http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20110321/118499.html">r128206</a>.</li>
794 <li>Miss-aligned MOVDQA might crash your program. It is due to
795 <a href="http://llvm.org/bugs/show_bug.cgi?id=9483">Bug 9483</a>,
796 lack of handling aligned internal globals.</li>
797 </ul>
798 </li>
799
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]800</ul>
801
802</div>
803
804<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]805<h3>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]806 <a name="ppc-be">Known problems with the PowerPC back-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]807</h3>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]808
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]809<div>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]810
811<ul>
Nicolas Geoffraye4285dc2007-05-15 09:21:28 +0000[diff] [blame]812<li>The Linux PPC32/ABI support needs testing for the interpreter and static
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]813compilation, and lacks support for debug information.</li>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]814</ul>
815
816</div>
817
818<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]819<h3>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]820 <a name="arm-be">Known problems with the ARM back-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]821</h3>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]822
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]823<div>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]824
825<ul>
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]826<li>Thumb mode works only on ARMv6 or higher processors. On sub-ARMv6
Duncan Sandsc90d68b2007-09-26 15:59:54 +0000[diff] [blame]827processors, thumb programs can crash or produce wrong
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]828results (<a href="http://llvm.org/PR1388">PR1388</a>).</li>
John Criswell524a5dd2009-03-02 15:28:15 +0000[diff] [blame]829<li>Compilation for ARM Linux OABI (old ABI) is supported but not fully tested.
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]830</li>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]831</ul>
832
833</div>
834
835<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]836<h3>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]837 <a name="sparc-be">Known problems with the SPARC back-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]838</h3>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]839
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]840<div>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]841
842<ul>
John Criswell524a5dd2009-03-02 15:28:15 +0000[diff] [blame]843<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]844 support the 64-bit SPARC ABI (-m64).</li>
845</ul>
846
847</div>
848
849<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]850<h3>
Bruno Cardoso Lopesb7e1a4f2008-10-25 14:56:26 +0000[diff] [blame]851 <a name="mips-be">Known problems with the MIPS back-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]852</h3>
Bruno Cardoso Lopesb7e1a4f2008-10-25 14:56:26 +0000[diff] [blame]853
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]854<div>
Bruno Cardoso Lopesb7e1a4f2008-10-25 14:56:26 +0000[diff] [blame]855
856<ul>
Bruno Cardoso Lopesb7e1a4f2008-10-25 14:56:26 +0000[diff] [blame]857<li>64-bit MIPS targets are not supported yet.</li>
858</ul>
859
860</div>
861
862<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]863<h3>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]864 <a name="alpha-be">Known problems with the Alpha back-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]865</h3>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]866
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]867<div>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]868
869<ul>
870
871<li>On 21164s, some rare FP arithmetic sequences which may trap do not have the
872appropriate nops inserted to ensure restartability.</li>
873
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]874</ul>
875</div>
876
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]877<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]878<h3>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]879 <a name="c-be">Known problems with the C back-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]880</h3>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]881
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]882<div>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]883
Chris Lattner3016ee92010-09-29 05:34:42 +0000[diff] [blame]884<p>The C backend has numerous problems and is not being actively maintained.
885Depending on it for anything serious is not advised.</p>
886
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]887<ul>
Chris Lattner5733b272008-06-05 06:35:40 +0000[diff] [blame]888<li><a href="http://llvm.org/PR802">The C backend has only basic support for
889 inline assembly code</a>.</li>
Chris Lattner725a0d82007-09-26 06:01:35 +0000[diff] [blame]890<li><a href="http://llvm.org/PR1658">The C backend violates the ABI of common
891 C++ programs</a>, preventing intermixing between C++ compiled by the CBE and
Gabor Greif4906abe2009-03-02 12:02:51 +0000[diff] [blame]892 C++ code compiled with <tt>llc</tt> or native compilers.</li>
Duncan Sandsf74c0cc2008-02-10 13:40:55 +0000[diff] [blame]893<li>The C backend does not support all exception handling constructs.</li>
Duncan Sands50723a92009-02-25 11:51:54 +0000[diff] [blame]894<li>The C backend does not support arbitrary precision integers.</li>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]895</ul>
896
897</div>
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]898
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]899
900<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]901<h3>
Chris Lattner3016ee92010-09-29 05:34:42 +0000[diff] [blame]902 <a name="llvm-gcc">Known problems with the llvm-gcc front-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]903</h3>
Chris Lattner47588f92003-10-02 05:07:23 +0000[diff] [blame]904
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]905<div>
Chris Lattnerc5d658a2006-03-03 00:34:26 +0000[diff] [blame]906
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]907<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]908
Chris Lattner3016ee92010-09-29 05:34:42 +0000[diff] [blame]909<p>llvm-gcc is generally very stable for the C family of languages. The only
910 major language feature of GCC not supported by llvm-gcc is the
911 <tt>__builtin_apply</tt> family of builtins. However, some extensions
912 are only supported on some targets. For example, trampolines are only
913 supported on some targets (these are used when you take the address of a
914 nested function).</p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]915
Chris Lattner3016ee92010-09-29 05:34:42 +0000[diff] [blame]916<p>Fortran support generally works, but there are still several unresolved bugs
917 in <a href="http://llvm.org/bugs/">Bugzilla</a>. Please see the
918 tools/gfortran component for details. Note that llvm-gcc is missing major
919 Fortran performance work in the frontend and library that went into GCC after
920 4.2. If you are interested in Fortran, we recommend that you consider using
921 <a href="#dragonegg">dragonegg</a> instead.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]922
Duncan Sands3af96332010-10-04 10:06:56 +0000[diff] [blame]923<p>The llvm-gcc 4.2 Ada compiler has basic functionality, but is no longer being
924actively maintained. If you are interested in Ada, we recommend that you
925consider using <a href="#dragonegg">dragonegg</a> instead.</p>
Chris Lattner2b659ef2008-02-12 06:29:45 +0000[diff] [blame]926</div>
927
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]928</div>
929
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]930<!-- *********************************************************************** -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]931<h2>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]932 <a name="additionalinfo">Additional Information</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]933</h2>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]934<!-- *********************************************************************** -->
935
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]936<div>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]937
Chris Lattner416db102005-05-16 17:13:10 +0000[diff] [blame]938<p>A wide variety of additional information is available on the <a
NAKAMURA Takumib9a33632011-04-09 02:13:37 +0000[diff] [blame]939href="http://llvm.org/">LLVM web page</a>, in particular in the <a
Chris Lattnerb4b0ce72007-05-18 00:44:29 +0000[diff] [blame]940href="http://llvm.org/docs/">documentation</a> section. The web page also
Reid Spencer669ed452007-07-09 08:04:31 +0000[diff] [blame]941contains versions of the API documentation which is up-to-date with the
942Subversion version of the source code.
Misha Brukman109d9e82005-03-30 19:14:24 +0000[diff] [blame]943You can access versions of these documents specific to this release by going
944into the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]945
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]946<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]947us via the <a href="http://llvm.org/docs/#maillist"> mailing
Chris Lattner5eccca42003-12-12 21:22:16 +0000[diff] [blame]948lists</a>.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]949
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]950</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]951
952<!-- *********************************************************************** -->
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]953
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]954<hr>
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]955<address>
Misha Brukman38847d52003-12-21 22:53:21 +0000[diff] [blame]956 <a href="http://jigsaw.w3.org/css-validator/check/referer"><img
Misha Brukman44408702008-12-11 17:34:48 +0000[diff] [blame]957 src="http://jigsaw.w3.org/css-validator/images/vcss-blue" alt="Valid CSS"></a>
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]958 <a href="http://validator.w3.org/check/referer"><img
Misha Brukman44408702008-12-11 17:34:48 +0000[diff] [blame]959 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]960
Chris Lattnerb4b0ce72007-05-18 00:44:29 +0000[diff] [blame]961 <a href="http://llvm.org/">LLVM Compiler Infrastructure</a><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]962 Last modified: $Date$
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]963</address>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]964
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]965</body>
966</html>