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gerrit-public.fairphone.software / fp2-dev / platform / external / llvm / 537d85bda8c28c01fb14ec3109d2f357c4bec1b6 / . / 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 Wendlingf2a78332011-10-25 01:01:42 +0000[diff] [blame]287
288<!-- FIXME: Comment out
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]289<h3>Crack Programming Language</h3>
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]290
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]291<div>
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]292<p>
293<a href="http://code.google.com/p/crack-language/">Crack</a> aims to provide the
294ease of development of a scripting language with the performance of a compiled
295language. The language derives concepts from C++, Java and Python, incorporating
296object-oriented programming, operator overloading and strong typing.</p>
297</div>
Bill Wendlingf2a78332011-10-25 01:01:42 +0000[diff] [blame]298-->
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]299
300<!--=========================================================================-->
Bill Wendlingf9778192011-10-26 00:09:55 +0000[diff] [blame]301<h3>Glasgow Haskell Compiler (GHC)</h3>
302
303<div>
304
305<p>GHC is an open source, state-of-the-art programming suite for Haskell, a
306 standard lazy functional programming language. It includes an optimizing
307 static compiler generating good code for a variety of platforms, together
308 with an interactive system for convenient, quick development.</p>
309
310<p>GHC 7.0 and onwards include an LLVM code generator, supporting LLVM 2.8 and
311 later. Since LLVM 2.9, GHC now includes experimental support for the ARM
312 platform with LLVM 3.0.</p>
313
314</div>
315
316<!--=========================================================================-->
Bill Wendlingf62333d2011-10-25 20:35:31 +0000[diff] [blame]317<h3>gwXscript</h3>
318
319<div>
320
321<p><a href="http://botwars.tk/gwscript/">gwXscript</a> is an object oriented,
322 aspect orientied programing language which can create both, executables (ELF,
323 EXE) and shared libraries (DLL, SO, DYNLIB). The compiler is implemented in
324 its own language and translates scripts into LLVM-IR which can be optimized
325 and translated into native code by the LLVM framework. Source code in
326 gwScript contains definitions that expand the namespaces. So you can build
327 your project and simply 'plug out' features by removing a file. The remaining
328 project does not leave scars since you directly separate concerns by the
329 'template' feature of gwX. It is also possible to add new features to a
330 project by just adding files and without editing the original project. This
331 language is used for example to create games or content management systems
332 that should be extendable.</p>
333
334<p>gwXscript is strongly typed and offers comfort with its native types string,
335 hash and array. You can easily write new libraries in gwXscript or native
336 code. gwXscript is type safe and users should not be able to crash your
337 program or execute malicious code except code that is eating CPU time.</p>
338
339</div>
340
341<!--=========================================================================-->
Bill Wendlingba226272011-10-25 20:37:45 +0000[diff] [blame]342<h3>Portable OpenCL (pocl)</h3>
343
344<div>
345
346<p>Portable OpenCL is an open source implementation of the OpenCL standard which
347 can be easily adapted for new targets. One of the goals of the project is
348 improving performance portability of OpenCL programs, avoiding the need for
349 target-dependent manual optimizations. A "native" target is included, which
350 allows running OpenCL kernels on the host (CPU).</p>
351
352</div>
353
354<!--=========================================================================-->
Bill Wendling0bad98c2011-10-25 20:39:06 +0000[diff] [blame]355<h3>Pure</h3>
356
357<div>
358<p><a href="http://pure-lang.googlecode.com/">Pure</a> is an
359 algebraic/functional programming language based on term rewriting. Programs
360 are collections of equations which are used to evaluate expressions in a
361 symbolic fashion. The interpreter uses LLVM as a backend to JIT-compile Pure
362 programs to fast native code. Pure offers dynamic typing, eager and lazy
363 evaluation, lexical closures, a hygienic macro system (also based on term
364 rewriting), built-in list and matrix support (including list and matrix
365 comprehensions) and an easy-to-use interface to C and other programming
366 languages (including the ability to load LLVM bitcode modules, and inline C,
367 C++, Fortran and Faust code in Pure programs if the corresponding LLVM-enabled
368 compilers are installed).</p>
369
370<p>Pure version 0.48 has been tested and is known to work with LLVM 3.0
371 (and continues to work with older LLVM releases &gt;= 2.5).</p>
372
373</div>
374
375<!--=========================================================================-->
Bill Wendling537d85b2011-10-26 00:12:04 +0000[diff] [blame^]376<h3>Renderscript</h3>
377
378<div>
379
380<p><a href="http://developer.android.com/guide/topics/renderscript/index.html">Renderscript</a>
381 is Android's advanced 3D graphics rendering and compute API. It provides a
382 portable C99-based language with extensions to facilitate common use cases
383 for enhancing graphics and thread level parallelism. The Renderscript
384 compiler frontend is based on Clang/LLVM. It emits a portable bitcode format
385 for the actual compiled script code, as well as reflects a Java interface for
386 developers to control the execution of the compiled bitcode. Executable
387 machine code is then generated from this bitcode by an LLVM backend on the
388 device. Renderscript is thus able to provide a mechanism by which Android
389 developers can improve performance of their applications while retaining
390 portability.</p>
391
392</div>
393
394<!--=========================================================================-->
Bill Wendling7d5b6212011-10-25 20:40:26 +0000[diff] [blame]395<h3>SAFECode</h3>
396
397<div>
398
399<p><a href="http://safecode.cs.illinois.edu">SAFECode</a> is a memory safe C/C++
400 compiler built using LLVM. It takes standard, unannotated C/C++ code,
401 analyzes the code to ensure that memory accesses and array indexing
402 operations are safe, and instruments the code with run-time checks when
403 safety cannot be proven statically. SAFECode can be used as a debugging aid
404 (like Valgrind) to find and repair memory safety bugs. It can also be used
405 to protect code from security attacks at run-time.</p>
406
407</div>
408
409<!--=========================================================================-->
Bill Wendling2d7b4af2011-10-25 20:24:32 +0000[diff] [blame]410<h3>TTA-based Co-design Environment (TCE)</h3>
411
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]412<div>
Bill Wendling2d7b4af2011-10-25 20:24:32 +0000[diff] [blame]413
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]414<p>TCE is a toolset for designing application-specific processors (ASP) based on
Bill Wendling2d7b4af2011-10-25 20:24:32 +0000[diff] [blame]415 the Transport triggered architecture (TTA). The toolset provides a complete
416 co-design flow from C/C++ programs down to synthesizable VHDL and parallel
417 program binaries. Processor customization points include the register files,
418 function units, supported operations, and the interconnection network.</p>
419
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]420<p>TCE uses Clang and LLVM for C/C++ language support, target independent
Bill Wendling2d7b4af2011-10-25 20:24:32 +0000[diff] [blame]421 optimizations and also for parts of code generation. It generates new
422 LLVM-based code generators <i>on the fly</i> for the designed TTA processors
423 and loads them in to the compiler backend as runtime libraries to avoid
424 per-target recompilation of larger parts of the compiler chain.</p>
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]425</div>
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]426
427
428<!--=========================================================================-->
Bill Wendling628c2662011-10-25 20:27:37 +0000[diff] [blame]429<h3>Tart Programming Language</h3>
430
431<div>
432
433<p><a href="http://code.google.com/p/tart/">Tart</a> is a general-purpose,
434 strongly typed programming language designed for application
435 developers. Strongly inspired by Python and C#, Tart focuses on practical
436 solutions for the professional software developer, while avoiding the clutter
437 and boilerplate of legacy languages like Java and C++. Although Tart is still
438 in development, the current implementation supports many features expected of
439 a modern programming language, such as garbage collection, powerful
440 bidirectional type inference, a greatly simplified syntax for template
441 metaprogramming, closures and function literals, reflection, operator
442 overloading, explicit mutability and immutability, and much more. Tart is
443 flexible enough to accommodate a broad range of programming styles and
444 philosophies, while maintaining a strong commitment to simplicity, minimalism
445 and elegance in design.</p>
446
447</div>
448
449<!--=========================================================================-->
Bill Wendlingf2a78332011-10-25 01:01:42 +0000[diff] [blame]450<!--
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]451<h3>PinaVM</h3>
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]452
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]453<div>
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]454<p><a href="http://gitorious.org/pinavm/pages/Home">PinaVM</a> is an open
455source, <a href="http://www.systemc.org/">SystemC</a> front-end. Unlike many
456other front-ends, PinaVM actually executes the elaboration of the
457program analyzed using LLVM's JIT infrastructure. It later enriches the
458bitcode with SystemC-specific information.</p>
459</div>
Bill Wendlingf2a78332011-10-25 01:01:42 +0000[diff] [blame]460-->
461
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]462
463<!--=========================================================================-->
Bill Wendlingf2a78332011-10-25 01:01:42 +0000[diff] [blame]464<!--
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]465<h3 id="icedtea">IcedTea Java Virtual Machine Implementation</h3>
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]466
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]467<div>
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]468<p>
469<a href="http://icedtea.classpath.org/wiki/Main_Page">IcedTea</a> provides a
470harness to build OpenJDK using only free software build tools and to provide
471replacements for the not-yet free parts of OpenJDK. One of the extensions that
472IcedTea provides is a new JIT compiler named <a
473href="http://icedtea.classpath.org/wiki/ZeroSharkFaq">Shark</a> which uses LLVM
474to provide native code generation without introducing processor-dependent
475code.
476</p>
477
478<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]479and 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]480releases &gt;= 2.6 as well).</p>
481</div>
Bill Wendlingf2a78332011-10-25 01:01:42 +0000[diff] [blame]482-->
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]483
484<!--=========================================================================-->
Bill Wendlingf2a78332011-10-25 01:01:42 +0000[diff] [blame]485<!--
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]486<h3>Polly - Polyhedral optimizations for LLVM</h3>
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]487
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]488<div>
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]489<p>Polly is a project that aims to provide advanced memory access optimizations
490to better take advantage of SIMD units, cache hierarchies, multiple cores or
491even vector accelerators for LLVM. Built around an abstract mathematical
492description based on Z-polyhedra, it provides the infrastructure to develop
493advanced optimizations in LLVM and to connect complex external optimizers. In
494its first year of existence Polly already provides an exact value-based
495dependency analysis as well as basic SIMD and OpenMP code generation support.
496Furthermore, Polly can use PoCC(Pluto) an advanced optimizer for data-locality
497and parallelism.</p>
498</div>
Bill Wendlingf2a78332011-10-25 01:01:42 +0000[diff] [blame]499-->
Chris Lattner75547712010-10-03 23:49:06 +0000[diff] [blame]500
Chris Lattner0fa5da92011-04-06 16:14:25 +0000[diff] [blame]501<!--=========================================================================-->
Bill Wendlingf2a78332011-10-25 01:01:42 +0000[diff] [blame]502<!--
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]503<h3>Rubinius</h3>
Chris Lattner0fa5da92011-04-06 16:14:25 +0000[diff] [blame]504
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]505<div>
Chris Lattner0fa5da92011-04-06 16:14:25 +0000[diff] [blame]506 <p><a href="http://github.com/evanphx/rubinius">Rubinius</a> is an environment
507 for running Ruby code which strives to write as much of the implementation in
508 Ruby as possible. Combined with a bytecode interpreting VM, it uses LLVM to
509 optimize and compile ruby code down to machine code. Techniques such as type
510 feedback, method inlining, and deoptimization are all used to remove dynamism
511 from ruby execution and increase performance.</p>
512</div>
Bill Wendlingf2a78332011-10-25 01:01:42 +0000[diff] [blame]513-->
Chris Lattner0fa5da92011-04-06 16:14:25 +0000[diff] [blame]514
Chris Lattnera844a3e2011-04-07 03:09:21 +0000[diff] [blame]515<!--=========================================================================-->
Bill Wendlingf2a78332011-10-25 01:01:42 +0000[diff] [blame]516<!--
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]517<h3>
Chris Lattnera844a3e2011-04-07 03:09:21 +0000[diff] [blame]518<a name="FAUST">FAUST Real-Time Audio Signal Processing Language</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]519</h3>
Chris Lattnere0518442010-10-01 06:34:49 +0000[diff] [blame]520
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]521<div>
Chris Lattnera844a3e2011-04-07 03:09:21 +0000[diff] [blame]522<p>
523<a href="http://faust.grame.fr">FAUST</a> is a compiled language for real-time
524audio signal processing. The name FAUST stands for Functional AUdio STream. Its
525programming model combines two approaches: functional programming and block
526diagram composition. In addition with the C, C++, JAVA output formats, the
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]527Faust 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]528
529</div>
Bill Wendlingf2a78332011-10-25 01:01:42 +0000[diff] [blame]530-->
Chris Lattnera844a3e2011-04-07 03:09:21 +0000[diff] [blame]531
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]532</div>
533
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]534<!-- *********************************************************************** -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]535<h2>
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]536 <a name="whatsnew">What's New in LLVM 3.0?</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]537</h2>
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]538<!-- *********************************************************************** -->
539
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]540<div>
Chris Lattnerf8e0b4e2008-06-08 22:59:35 +0000[diff] [blame]541
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]542<p>This release includes a huge number of bug fixes, performance tweaks and
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]543minor improvements. Some of the major improvements and new features are listed
544in this section.
Chris Lattnerf8e0b4e2008-06-08 22:59:35 +0000[diff] [blame]545</p>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]546
Chris Lattner914ce462010-04-22 06:28:20 +0000[diff] [blame]547<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]548<h3>
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]549<a name="majorfeatures">Major New Features</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]550</h3>
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]551
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]552<div>
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]553
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]554<p>LLVM 3.0 includes several major new capabilities:</p>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]555
556<ul>
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]557
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]558<!--
559<li></li>
560-->
Chris Lattner7a8e6c52011-04-05 18:38:45 +0000[diff] [blame]561
Chris Lattner8170c102008-02-10 08:18:42 +0000[diff] [blame]562</ul>
Chris Lattner0a6f6d52011-04-05 07:19:28 +0000[diff] [blame]563
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]564</div>
565
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]566<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]567<h3>
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]568<a name="coreimprovements">LLVM IR and Core Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]569</h3>
Chris Lattnerf304ffc2008-02-10 08:17:19 +0000[diff] [blame]570
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]571<div>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]572<p>LLVM IR has several new features for better support of new targets and that
573expose new optimization opportunities:</p>
Chris Lattnerf304ffc2008-02-10 08:17:19 +0000[diff] [blame]574
Chris Lattner791f77b2008-06-05 06:25:56 +0000[diff] [blame]575<ul>
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]576<!--
577<li></li>
578-->
Chris Lattnerf304ffc2008-02-10 08:17:19 +0000[diff] [blame]579</ul>
Mikhail Glushenkovea65d7d2008-10-13 02:08:34 +0000[diff] [blame]580
Chris Lattnerf304ffc2008-02-10 08:17:19 +0000[diff] [blame]581</div>
582
583<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]584<h3>
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]585<a name="optimizer">Optimizer Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]586</h3>
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]587
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]588<div>
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]589
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]590<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]591release includes a few major enhancements and additions to the optimizers:</p>
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]592
593<ul>
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]594<!--
595<li></li>
596-->
Chris Lattnerc5ac61d2011-04-06 05:50:04 +0000[diff] [blame]597</li>
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]598
Chris Lattner11b66112010-10-04 02:42:39 +0000[diff] [blame]599</ul>
600
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]601</div>
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]602
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]603<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]604<h3>
Chris Lattner4ba2b652010-09-30 16:31:33 +0000[diff] [blame]605<a name="mc">MC Level Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]606</h3>
Chris Lattner4ba2b652010-09-30 16:31:33 +0000[diff] [blame]607
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]608<div>
Chris Lattner4ba2b652010-09-30 16:31:33 +0000[diff] [blame]609<p>
Chris Lattner7d9b6b42010-10-02 21:59:30 +0000[diff] [blame]610The LLVM Machine Code (aka MC) subsystem was created to solve a number
Chris Lattner4ba2b652010-09-30 16:31:33 +0000[diff] [blame]611of problems in the realm of assembly, disassembly, object file format handling,
612and a number of other related areas that CPU instruction-set level tools work
Chris Lattner7d9b6b42010-10-02 21:59:30 +0000[diff] [blame]613in.</p>
614
Chris Lattner7d9b6b42010-10-02 21:59:30 +0000[diff] [blame]615<ul>
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]616<!--
617<li></li>
618-->
Chris Lattner7d9b6b42010-10-02 21:59:30 +0000[diff] [blame]619</ul>
620
621<p>For more information, please see the <a
Chris Lattner4ba2b652010-09-30 16:31:33 +0000[diff] [blame]622href="http://blog.llvm.org/2010/04/intro-to-llvm-mc-project.html">Intro to the
623LLVM MC Project Blog Post</a>.
624</p>
625
NAKAMURA Takumi45c435a2011-04-05 08:24:22 +0000[diff] [blame]626</div>
Chris Lattner4ba2b652010-09-30 16:31:33 +0000[diff] [blame]627
Chris Lattner4ba2b652010-09-30 16:31:33 +0000[diff] [blame]628<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]629<h3>
Chris Lattner511433e2009-03-02 03:24:11 +0000[diff] [blame]630<a name="codegen">Target Independent Code Generator Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]631</h3>
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]632
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]633<div>
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]634
Mikhail Glushenkovf795ef02009-03-01 18:09:47 +0000[diff] [blame]635<p>We have put a significant amount of work into the code generator
636infrastructure, which allows us to implement more aggressive algorithms and make
637it run faster:</p>
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]638
639<ul>
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]640<!--
641<li></li>
642-->
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]643</ul>
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]644</div>
645
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]646<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]647<h3>
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]648<a name="x86">X86-32 and X86-64 Target Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]649</h3>
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]650
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]651<div>
Chris Lattner7714c912010-10-04 04:39:25 +0000[diff] [blame]652<p>New features and major changes in the X86 target include:
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]653</p>
654
655<ul>
Chad Rosierf94c9c12011-05-27 20:13:10 +0000[diff] [blame]656<li>The CRC32 intrinsics have been renamed. The intrinsics were previously
657 @llvm.x86.sse42.crc32.[8|16|32] and @llvm.x86.sse42.crc64.[8|64]. They have
658 been renamed to @llvm.x86.sse42.crc32.32.[8|16|32] and
659 @llvm.x86.sse42.crc32.64.[8|64].</li>
660
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]661</ul>
662
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]663</div>
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]664
665<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]666<h3>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]667<a name="ARM">ARM Target Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]668</h3>
Chris Lattnerc441fb82009-03-01 02:30:21 +0000[diff] [blame]669
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]670<div>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]671<p>New features of the ARM target include:
672</p>
Chris Lattnerc441fb82009-03-01 02:30:21 +0000[diff] [blame]673
674<ul>
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]675<!--
676<li></li>
677-->
Bob Wilsone8472772010-09-13 17:39:35 +0000[diff] [blame]678</ul>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]679</div>
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]680
681<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]682<h3>
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]683<a name="OtherTS">Other Target Specific Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]684</h3>
Chris Lattnerc441fb82009-03-01 02:30:21 +0000[diff] [blame]685
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]686<div>
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]687<ul>
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]688<!--
689<li></li>
690-->
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]691</ul>
692</div>
Chris Lattner77d29b12008-06-05 08:02:49 +0000[diff] [blame]693
694<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]695<h3>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]696<a name="changes">Major Changes and Removed Features</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]697</h3>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]698
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]699<div>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]700
Bill Wendling2626dba2011-08-03 22:18:20 +0000[diff] [blame]701<p>If you're already an LLVM user or developer with out-of-tree changes based on
702 LLVM 2.9, this section lists some "gotchas" that you may run into upgrading
703 from the previous release.</p>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]704
705<ul>
Eric Christopher90d6ec52011-09-28 19:47:28 +0000[diff] [blame]706 <li>The <code>LLVMC</code> front end code was removed while separating
707 out language independence.</li>
Jay Foadf42e9b22011-08-04 10:43:43 +0000[diff] [blame]708 <li>The <code>LowerSetJmp</code> pass wasn't used effectively by any
709 target and has been removed.</li>
Rafael Espindolaf940a1a2011-08-30 23:03:45 +0000[diff] [blame]710 <li>The old <code>TailDup</code> pass was not used in the standard pipeline
711 and was unable to update ssa form, so it has been removed.
Eli Friedmanf03bb262011-08-12 22:50:01 +0000[diff] [blame]712 <li>The syntax of volatile loads and stores in IR has been changed to
713 "<code>load volatile</code>"/"<code>store volatile</code>". The old
714 syntax ("<code>volatile load</code>"/"<code>volatile store</code>")
715 is still accepted, but is now considered deprecated.</li>
Devang Patelb34dd132008-10-14 20:03:43 +0000[diff] [blame]716</ul>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]717
NAKAMURA Takumi2026de22011-08-22 23:22:05 +0000[diff] [blame]718<h4>Windows (32-bit)</h4>
719<div>
720<ul>
721 <li>On Win32(MinGW32 and MSVC), Windows 2000 will not be supported.
722 Windows XP or higher is required.</li>
723</ul>
724</div>
725
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]726</div>
727
Daniel Dunbarf0233c62010-10-04 20:11:41 +0000[diff] [blame]728<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]729<h3>
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]730<a name="api_changes">Internal API Changes</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]731</h3>
Daniel Dunbarf0233c62010-10-04 20:11:41 +0000[diff] [blame]732
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]733<div>
Daniel Dunbarf0233c62010-10-04 20:11:41 +0000[diff] [blame]734
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]735<p>In addition, many APIs have changed in this release. Some of the major
Bill Wendling16005252011-08-02 06:20:17 +0000[diff] [blame]736 LLVM API changes are:</p>
Daniel Dunbarf0233c62010-10-04 20:11:41 +0000[diff] [blame]737
738<ul>
Chris Lattnerd1324302011-07-18 04:56:02 +0000[diff] [blame]739<li>The biggest and most pervasive change is that llvm::Type's are no longer
740 returned or accepted as 'const' values. Instead, just pass around non-const
741 Type's.</li>
742
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]743<li><code>PHINode::reserveOperandSpace</code> has been removed. Instead, you
744 must specify how many operands to reserve space for when you create the
745 PHINode, by passing an extra argument into <code>PHINode::Create</code>.</li>
746
747<li>PHINodes no longer store their incoming BasicBlocks as operands. Instead,
748 the list of incoming BasicBlocks is stored separately, and can be accessed
749 with new functions <code>PHINode::block_begin</code>
750 and <code>PHINode::block_end</code>.</li>
751
752<li>Various functions now take an <code>ArrayRef</code> instead of either a pair
753 of pointers (or iterators) to the beginning and end of a range, or a pointer
754 and a length. Others now return an <code>ArrayRef</code> instead of a
755 reference to a <code>SmallVector</code> or <code>std::vector</code>. These
756 include:
757<ul>
758<!-- Please keep this list sorted. -->
Jay Foada3efbb12011-07-15 08:37:34 +0000[diff] [blame]759<li><code>CallInst::Create</code></li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]760<li><code>ComputeLinearIndex</code> (in <code>llvm/CodeGen/Analysis.h</code>)</li>
761<li><code>ConstantArray::get</code></li>
762<li><code>ConstantExpr::getExtractElement</code></li>
Jay Foaddab3d292011-07-21 14:31:17 +0000[diff] [blame]763<li><code>ConstantExpr::getGetElementPtr</code></li>
764<li><code>ConstantExpr::getInBoundsGetElementPtr</code></li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]765<li><code>ConstantExpr::getIndices</code></li>
766<li><code>ConstantExpr::getInsertElement</code></li>
767<li><code>ConstantExpr::getWithOperands</code></li>
Jay Foad1d2f5692011-07-19 13:32:40 +0000[diff] [blame]768<li><code>ConstantFoldCall</code> (in <code>llvm/Analysis/ConstantFolding.h</code>)</li>
769<li><code>ConstantFoldInstOperands</code> (in <code>llvm/Analysis/ConstantFolding.h</code>)</li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]770<li><code>ConstantVector::get</code></li>
771<li><code>DIBuilder::createComplexVariable</code></li>
772<li><code>DIBuilder::getOrCreateArray</code></li>
773<li><code>ExtractValueInst::Create</code></li>
774<li><code>ExtractValueInst::getIndexedType</code></li>
775<li><code>ExtractValueInst::getIndices</code></li>
776<li><code>FindInsertedValue</code> (in <code>llvm/Analysis/ValueTracking.h</code>)</li>
Jay Foadca12a212011-07-19 14:42:50 +0000[diff] [blame]777<li><code>gep_type_begin</code> (in <code>llvm/Support/GetElementPtrTypeIterator.h</code>)</li>
778<li><code>gep_type_end</code> (in <code>llvm/Support/GetElementPtrTypeIterator.h</code>)</li>
Jay Foada9203102011-07-25 09:48:08 +0000[diff] [blame]779<li><code>GetElementPtrInst::Create</code></li>
780<li><code>GetElementPtrInst::CreateInBounds</code></li>
781<li><code>GetElementPtrInst::getIndexedType</code></li>
Jay Foadb60e8512011-07-21 14:42:51 +0000[diff] [blame]782<li><code>InsertValueInst::Create</code></li>
783<li><code>InsertValueInst::getIndices</code></li>
784<li><code>InvokeInst::Create</code></li>
Jay Foada3efbb12011-07-15 08:37:34 +0000[diff] [blame]785<li><code>IRBuilder::CreateCall</code></li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]786<li><code>IRBuilder::CreateExtractValue</code></li>
Jay Foad0a2a60a2011-07-22 08:16:57 +0000[diff] [blame]787<li><code>IRBuilder::CreateGEP</code></li>
788<li><code>IRBuilder::CreateInBoundsGEP</code></li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]789<li><code>IRBuilder::CreateInsertValue</code></li>
Jay Foada3efbb12011-07-15 08:37:34 +0000[diff] [blame]790<li><code>IRBuilder::CreateInvoke</code></li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]791<li><code>MDNode::get</code></li>
792<li><code>MDNode::getIfExists</code></li>
793<li><code>MDNode::getTemporary</code></li>
794<li><code>MDNode::getWhenValsUnresolved</code></li>
Jay Foadb9b54eb2011-07-19 15:07:52 +0000[diff] [blame]795<li><code>SimplifyGEPInst</code> (in <code>llvm/Analysis/InstructionSimplify.h</code>)</li>
Jay Foad8fbbb392011-07-19 14:01:37 +0000[diff] [blame]796<li><code>TargetData::getIndexedOffset</code></li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]797</ul></li>
798
799<li>All forms of <code>StringMap::getOrCreateValue</code> have been remove
800 except for the one which takes a <code>StringRef</code>.</li>
801
Bill Wendling16005252011-08-02 06:20:17 +0000[diff] [blame]802<li>The <code>LLVMBuildUnwind</code> function from the C API was removed. The
803 LLVM <code>unwind</code> instruction has been deprecated for a long time and
Bill Wendling086da7e2011-08-02 06:39:13 +0000[diff] [blame]804 isn't used by the current front-ends. So this was removed during the
Bill Wendling16005252011-08-02 06:20:17 +0000[diff] [blame]805 exception handling rewrite.</li>
806
Bill Wendling2626dba2011-08-03 22:18:20 +0000[diff] [blame]807<li>The <code>LLVMAddLowerSetJmpPass</code> function from the C API was removed
808 because the <code>LowerSetJmp</code> pass was removed.</li>
809
Devang Patel6326a422011-08-15 23:00:00 +0000[diff] [blame]810<li>The <code>DIBuilder</code> interface used by front ends to encode debugging
811 information in the LLVM IR now expects clients to use <code>DIBuilder::finalize()</code>
812 at the end of translation unit to complete debugging information encoding.</li>
813
Torok Edwinf16e2d42011-09-30 13:07:52 +0000[diff] [blame]814<li>The way the type system works has been rewritten: <code>PATypeHolder</code>
815and <code>OpaqueType</code> are gone, and all APIs deal with <code>Type*</code>
816instead of <code>const Type*</code>.
817If you need to create recursive structures, then create a named structure,
818and use <code>setBody()</code> when all its elements are built.
819Type merging and refining is gone too: named structures are not
820merged with other structures, even if their layout is identical.
821(of course anonymous structures are still uniqued by layout).
822</li>
823
824<li>TargetSelect.h moved to Support/ from Target/</li>
825
826<li>UpgradeIntrinsicCall no longer upgrades pre-2.9 intrinsic calls
827(for example <code>llvm.memset.i32</code>).</li>
828
829<li>It is mandatory to initialize all out-of-tree passes too and their dependencies now with
830<code>INITIALIZE_PASS{BEGIN,END,}</code> and <code>INITIALIZE_{PASS,AG}_DEPENDENCY</code>.</li>
831
Eli Friedmanb4141422011-10-13 22:14:57 +0000[diff] [blame]832<li>The interface for MemDepResult in MemoryDependenceAnalysis has been enhanced
833 with new return types Unknown and NonFuncLocal, in addition to the existing
834 types Clobber, Def, and NonLocal.</li>
835
Daniel Dunbarf0233c62010-10-04 20:11:41 +0000[diff] [blame]836</ul>
837</div>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]838
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]839</div>
840
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]841<!-- *********************************************************************** -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]842<h2>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]843 <a name="knownproblems">Known Problems</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]844</h2>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]845<!-- *********************************************************************** -->
846
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]847<div>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]848
Mikhail Glushenkovf795ef02009-03-01 18:09:47 +0000[diff] [blame]849<p>This section contains significant known problems with the LLVM system,
Chris Lattnere18b32e2008-11-10 05:40:34 +0000[diff] [blame]850listed by component. If you run into a problem, please check the <a
Chris Lattnerc463b272005-10-29 07:07:09 +0000[diff] [blame]851href="http://llvm.org/bugs/">LLVM bug database</a> and submit a bug if
Chris Lattner5eccca42003-12-12 21:22:16 +0000[diff] [blame]852there isn't already one.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]853
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]854<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]855<h3>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]856 <a name="experimental">Experimental features included with this release</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]857</h3>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]858
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]859<div>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]860
Misha Brukman6df9e2c2004-05-12 21:46:05 +0000[diff] [blame]861<p>The following components of this LLVM release are either untested, known to
862be broken or unreliable, or are in early development. These components should
863not be relied on, and bugs should not be filed against them, but they may be
864useful 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]865components, please contact us on the <a
866href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVMdev list</a>.</p>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]867
868<ul>
Dan Gohman3e6157d2011-10-25 00:05:42 +0000[diff] [blame]869<li>The Alpha, CellSPU, MicroBlaze, MSP430, MIPS, PTX,
Chris Lattnerbb117712010-10-04 01:29:06 +0000[diff] [blame]870 and XCore backends are experimental.</li>
Chris Lattner7d9b6b42010-10-02 21:59:30 +0000[diff] [blame]871<li><tt>llc</tt> "<tt>-filetype=obj</tt>" is experimental on all targets
Chris Lattner49123fd2011-04-06 06:29:50 +0000[diff] [blame]872 other than darwin and ELF X86 systems.</li>
Chris Lattnerbe2e1b52011-03-10 07:43:44 +0000[diff] [blame]873
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]874</ul>
875
876</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]877
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]878<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]879<h3>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]880 <a name="x86-be">Known problems with the X86 back-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]881</h3>
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]882
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]883<div>
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]884
885<ul>
Anton Korobeynikova6094be2008-06-08 10:24:13 +0000[diff] [blame]886 <li>The X86 backend does not yet support
887 all <a href="http://llvm.org/PR879">inline assembly that uses the X86
888 floating point stack</a>. It supports the 'f' and 't' constraints, but not
889 'u'.</li>
Dan Gohman8207ba92008-06-08 23:05:11 +0000[diff] [blame]890 <li>The X86-64 backend does not yet support the LLVM IR instruction
Chris Lattner914ce462010-04-22 06:28:20 +0000[diff] [blame]891 <tt>va_arg</tt>. Currently, front-ends support variadic
Dan Gohman8207ba92008-06-08 23:05:11 +0000[diff] [blame]892 argument constructs on X86-64 by lowering them manually.</li>
NAKAMURA Takumi45c435a2011-04-05 08:24:22 +0000[diff] [blame]893 <li>Windows x64 (aka Win64) code generator has a few issues.
894 <ul>
895 <li>llvm-gcc cannot build the mingw-w64 runtime currently
896 due to lack of support for the 'u' inline assembly
897 constraint and for X87 floating point inline assembly.</li>
898 <li>On mingw-w64, you will see unresolved symbol <tt>__chkstk</tt>
899 due to <a href="http://llvm.org/bugs/show_bug.cgi?id=8919">Bug 8919</a>.
900 It is fixed in <a href="http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20110321/118499.html">r128206</a>.</li>
901 <li>Miss-aligned MOVDQA might crash your program. It is due to
902 <a href="http://llvm.org/bugs/show_bug.cgi?id=9483">Bug 9483</a>,
903 lack of handling aligned internal globals.</li>
904 </ul>
905 </li>
906
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]907</ul>
908
909</div>
910
911<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]912<h3>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]913 <a name="ppc-be">Known problems with the PowerPC back-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]914</h3>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]915
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]916<div>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]917
918<ul>
Nicolas Geoffraye4285dc2007-05-15 09:21:28 +0000[diff] [blame]919<li>The Linux PPC32/ABI support needs testing for the interpreter and static
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]920compilation, and lacks support for debug information.</li>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]921</ul>
922
923</div>
924
925<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]926<h3>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]927 <a name="arm-be">Known problems with the ARM back-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]928</h3>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]929
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]930<div>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]931
932<ul>
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]933<li>Thumb mode works only on ARMv6 or higher processors. On sub-ARMv6
Duncan Sandsc90d68b2007-09-26 15:59:54 +0000[diff] [blame]934processors, thumb programs can crash or produce wrong
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]935results (<a href="http://llvm.org/PR1388">PR1388</a>).</li>
John Criswell524a5dd2009-03-02 15:28:15 +0000[diff] [blame]936<li>Compilation for ARM Linux OABI (old ABI) is supported but not fully tested.
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]937</li>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]938</ul>
939
940</div>
941
942<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]943<h3>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]944 <a name="sparc-be">Known problems with the SPARC back-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]945</h3>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]946
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]947<div>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]948
949<ul>
John Criswell524a5dd2009-03-02 15:28:15 +0000[diff] [blame]950<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]951 support the 64-bit SPARC ABI (-m64).</li>
952</ul>
953
954</div>
955
956<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]957<h3>
Bruno Cardoso Lopesb7e1a4f2008-10-25 14:56:26 +0000[diff] [blame]958 <a name="mips-be">Known problems with the MIPS back-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]959</h3>
Bruno Cardoso Lopesb7e1a4f2008-10-25 14:56:26 +0000[diff] [blame]960
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]961<div>
Bruno Cardoso Lopesb7e1a4f2008-10-25 14:56:26 +0000[diff] [blame]962
963<ul>
Bruno Cardoso Lopesb7e1a4f2008-10-25 14:56:26 +0000[diff] [blame]964<li>64-bit MIPS targets are not supported yet.</li>
965</ul>
966
967</div>
968
969<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]970<h3>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]971 <a name="alpha-be">Known problems with the Alpha back-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]972</h3>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]973
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]974<div>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]975
976<ul>
977
978<li>On 21164s, some rare FP arithmetic sequences which may trap do not have the
979appropriate nops inserted to ensure restartability.</li>
980
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]981</ul>
982</div>
983
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]984<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]985<h3>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]986 <a name="c-be">Known problems with the C back-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]987</h3>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]988
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]989<div>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]990
Chris Lattner3016ee92010-09-29 05:34:42 +0000[diff] [blame]991<p>The C backend has numerous problems and is not being actively maintained.
992Depending on it for anything serious is not advised.</p>
993
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]994<ul>
Chris Lattner5733b272008-06-05 06:35:40 +0000[diff] [blame]995<li><a href="http://llvm.org/PR802">The C backend has only basic support for
996 inline assembly code</a>.</li>
Chris Lattner725a0d82007-09-26 06:01:35 +0000[diff] [blame]997<li><a href="http://llvm.org/PR1658">The C backend violates the ABI of common
998 C++ programs</a>, preventing intermixing between C++ compiled by the CBE and
Gabor Greif4906abe2009-03-02 12:02:51 +0000[diff] [blame]999 C++ code compiled with <tt>llc</tt> or native compilers.</li>
Duncan Sandsf74c0cc2008-02-10 13:40:55 +0000[diff] [blame]1000<li>The C backend does not support all exception handling constructs.</li>
Duncan Sands50723a92009-02-25 11:51:54 +0000[diff] [blame]1001<li>The C backend does not support arbitrary precision integers.</li>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1002</ul>
1003
1004</div>
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]1005
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1006
1007<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1008<h3>
Chris Lattner3016ee92010-09-29 05:34:42 +0000[diff] [blame]1009 <a name="llvm-gcc">Known problems with the llvm-gcc front-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1010</h3>
Chris Lattner47588f92003-10-02 05:07:23 +0000[diff] [blame]1011
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1012<div>
Chris Lattnerc5d658a2006-03-03 00:34:26 +0000[diff] [blame]1013
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]1014<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]1015
Chris Lattner3016ee92010-09-29 05:34:42 +0000[diff] [blame]1016<p>llvm-gcc is generally very stable for the C family of languages. The only
1017 major language feature of GCC not supported by llvm-gcc is the
1018 <tt>__builtin_apply</tt> family of builtins. However, some extensions
1019 are only supported on some targets. For example, trampolines are only
1020 supported on some targets (these are used when you take the address of a
1021 nested function).</p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1022
Chris Lattner3016ee92010-09-29 05:34:42 +0000[diff] [blame]1023<p>Fortran support generally works, but there are still several unresolved bugs
1024 in <a href="http://llvm.org/bugs/">Bugzilla</a>. Please see the
1025 tools/gfortran component for details. Note that llvm-gcc is missing major
1026 Fortran performance work in the frontend and library that went into GCC after
1027 4.2. If you are interested in Fortran, we recommend that you consider using
1028 <a href="#dragonegg">dragonegg</a> instead.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1029
Duncan Sands3af96332010-10-04 10:06:56 +0000[diff] [blame]1030<p>The llvm-gcc 4.2 Ada compiler has basic functionality, but is no longer being
1031actively maintained. If you are interested in Ada, we recommend that you
1032consider using <a href="#dragonegg">dragonegg</a> instead.</p>
Chris Lattner2b659ef2008-02-12 06:29:45 +0000[diff] [blame]1033</div>
1034
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1035</div>
1036
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1037<!-- *********************************************************************** -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1038<h2>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1039 <a name="additionalinfo">Additional Information</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1040</h2>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1041<!-- *********************************************************************** -->
1042
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1043<div>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1044
Chris Lattner416db102005-05-16 17:13:10 +0000[diff] [blame]1045<p>A wide variety of additional information is available on the <a
NAKAMURA Takumib9a33632011-04-09 02:13:37 +0000[diff] [blame]1046href="http://llvm.org/">LLVM web page</a>, in particular in the <a
Chris Lattnerb4b0ce72007-05-18 00:44:29 +0000[diff] [blame]1047href="http://llvm.org/docs/">documentation</a> section. The web page also
Reid Spencer669ed452007-07-09 08:04:31 +0000[diff] [blame]1048contains versions of the API documentation which is up-to-date with the
1049Subversion version of the source code.
Misha Brukman109d9e82005-03-30 19:14:24 +0000[diff] [blame]1050You can access versions of these documents specific to this release by going
1051into the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1052
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1053<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]1054us via the <a href="http://llvm.org/docs/#maillist"> mailing
Chris Lattner5eccca42003-12-12 21:22:16 +0000[diff] [blame]1055lists</a>.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1056
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1057</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1058
1059<!-- *********************************************************************** -->
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1060
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1061<hr>
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]1062<address>
Misha Brukman38847d52003-12-21 22:53:21 +0000[diff] [blame]1063 <a href="http://jigsaw.w3.org/css-validator/check/referer"><img
Misha Brukman44408702008-12-11 17:34:48 +0000[diff] [blame]1064 src="http://jigsaw.w3.org/css-validator/images/vcss-blue" alt="Valid CSS"></a>
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]1065 <a href="http://validator.w3.org/check/referer"><img
Misha Brukman44408702008-12-11 17:34:48 +0000[diff] [blame]1066 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]1067
Chris Lattnerb4b0ce72007-05-18 00:44:29 +0000[diff] [blame]1068 <a href="http://llvm.org/">LLVM Compiler Infrastructure</a><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1069 Last modified: $Date$
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]1070</address>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1071
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1072</body>
1073</html>