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gerrit-public.fairphone.software / fp2-dev / platform / external / llvm / 71810ab7c0ecd6927dde1eee0c73169642f3764d / . / 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
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]47 Infrastructure, release 3.0. Here we describe the status of LLVM, including
48 major improvements from the previous release and significant known problems.
49 All LLVM releases may be downloaded from
50 the <a href="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
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]53 release, please check out the <a href="http://llvm.org/">main LLVM web
54 site</a>. If you have questions or comments,
55 the <a href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVM
56 Developer's Mailing List</a> is a good place to send them.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]57
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]58<p>Note that if you are reading this file from a Subversion checkout or the main
59 LLVM web page, this document applies to the <i>next</i> release, not the
60 current one. To see the release notes for a specific release, please see the
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>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]81
82<p>The LLVM 3.0 distribution currently consists of code from the core LLVM
83 repository (which roughly includes the LLVM optimizers, code generators and
84 supporting tools), the Clang repository and the llvm-gcc repository. In
85 addition to this code, the LLVM Project includes other sub-projects that are
86 in development. Here we include updates on these subprojects.</p>
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]87
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]88<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]89<h3>
Chris Lattnerfb97b2d2008-10-13 18:11:54 +0000[diff] [blame]90<a name="clang">Clang: C/C++/Objective-C Frontend Toolkit</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]91</h3>
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]92
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]93<div>
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]94
Chris Lattner095539f2010-04-26 17:42:18 +0000[diff] [blame]95<p><a href="http://clang.llvm.org/">Clang</a> is an LLVM front end for the C,
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]96 C++, and Objective-C languages. Clang aims to provide a better user
97 experience through expressive diagnostics, a high level of conformance to
98 language standards, fast compilation, and low memory use. Like LLVM, Clang
99 provides a modular, library-based architecture that makes it suitable for
100 creating or integrating with other development tools. Clang is considered a
101 production-quality compiler for C, Objective-C, C++ and Objective-C++ on x86
102 (32- and 64-bit), and for darwin/arm targets.</p>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]103
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]104<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]105
106<ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]107 <li>Greatly improved support for building C++ applications, with greater
108 stability and better diagnostics.</li>
Douglas Gregorba087df2011-10-15 00:48:01 +0000[diff] [blame]109
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]110 <li><a href="http://clang.llvm.org/cxx_status.html">Improved support</a> for
111 the <a href="http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=50372">C++
112 2011</a> standard, including implementations of non-static data member
113 initializers, alias templates, delegating constructors, the range-based
114 for loop, and implicitly-generated move constructors and move assignment
115 operators, among others.</li>
Douglas Gregorba087df2011-10-15 00:48:01 +0000[diff] [blame]116
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]117 <li>Implemented support for some features of the upcoming C1x standard,
118 including static assertions and generic selections.</li>
Douglas Gregorba087df2011-10-15 00:48:01 +0000[diff] [blame]119
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]120 <li>Better detection of include and linking paths for system headers and
121 libraries, especially for Linux distributions.</li>
Douglas Gregorba087df2011-10-15 00:48:01 +0000[diff] [blame]122
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]123 <li>Implemented support
124 for <a href="http://clang.llvm.org/docs/AutomaticReferenceCounting.html">Automatic
125 Reference Counting</a> for Objective-C.</li>
Douglas Gregorba087df2011-10-15 00:48:01 +0000[diff] [blame]126
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]127 <li>Implemented a number of optimizations in <tt>libclang</tt>, the Clang C
128 interface, to improve the performance of code completion and the mapping
129 from source locations to abstract syntax tree nodes.</li>
Douglas Gregorba087df2011-10-15 00:48:01 +0000[diff] [blame]130</ul>
131
Chris Lattner0a6f6d52011-04-05 07:19:28 +0000[diff] [blame]132
Duncan Sandsf3ba7af2011-04-06 08:07:40 +0000[diff] [blame]133<p>If Clang rejects your code but another compiler accepts it, please take a
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]134 look at the <a href="http://clang.llvm.org/compatibility.html">language
135 compatibility</a> guide to make sure this is not intentional or a known
136 issue.</p>
Bill Wendling741748a2008-10-27 09:27:33 +0000[diff] [blame]137
Chris Lattnerfb97b2d2008-10-13 18:11:54 +0000[diff] [blame]138</div>
139
140<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]141<h3>
Duncan Sands528a5102011-04-04 11:09:08 +0000[diff] [blame]142<a name="dragonegg">DragonEgg: GCC front-ends, LLVM back-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]143</h3>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]144
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]145<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]146<p><a href="http://dragonegg.llvm.org/">DragonEgg</a> is a
147 <a href="http://gcc.gnu.org/wiki/plugins">gcc plugin</a> that replaces GCC's
148 optimizers and code generators with LLVM's. Currently it requires a patched
149 version of gcc-4.5. The plugin can target the x86-32 and x86-64 processor
150 families and has been used successfully on the Darwin, FreeBSD and Linux
151 platforms. The Ada, C, C++ and Fortran languages work well. The plugin is
152 capable of compiling plenty of Obj-C, Obj-C++ and Java but it is not known
153 whether the compiled code actually works or not!</p>
Duncan Sands749fd832010-04-02 09:23:15 +0000[diff] [blame]154
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]155<p>The 3.0 release has the following notable changes:</p>
156
Duncan Sands4b1da2b2010-09-30 17:37:34 +0000[diff] [blame]157<ul>
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]158<!--
159<li></li>
160-->
Duncan Sands4b1da2b2010-09-30 17:37:34 +0000[diff] [blame]161</ul>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]162
163</div>
164
Chris Lattner75547712010-10-03 23:49:06 +0000[diff] [blame]165<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]166<h3>
Chris Lattner75547712010-10-03 23:49:06 +0000[diff] [blame]167<a name="compiler-rt">compiler-rt: Compiler Runtime Library</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]168</h3>
Chris Lattner75547712010-10-03 23:49:06 +0000[diff] [blame]169
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]170<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]171
172<p>The new LLVM <a href="http://compiler-rt.llvm.org/">compiler-rt project</a>
173 is a simple library that provides an implementation of the low-level
174 target-specific hooks required by code generation and other runtime
175 components. For example, when compiling for a 32-bit target, converting a
176 double to a 64-bit unsigned integer is compiled into a runtime call to the
177 "__fixunsdfdi" function. The compiler-rt library provides highly optimized
178 implementations of this and other low-level routines (some are 3x faster than
179 the equivalent libgcc routines).</p>
Chris Lattner75547712010-10-03 23:49:06 +0000[diff] [blame]180
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]181<p>In the LLVM 3.0 timeframe,</p>
Chris Lattner75547712010-10-03 23:49:06 +0000[diff] [blame]182
183</div>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]184
185<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]186<h3>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]187<a name="lldb">LLDB: Low Level Debugger</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]188</h3>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]189
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]190<div>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]191
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]192<p>LLDB has advanced by leaps and bounds in the 3.0 timeframe. It is
193 dramatically more stable and useful, and includes both a
194 new <a href="http://lldb.llvm.org/tutorial.html">tutorial</a> and
195 a <a href="http://lldb.llvm.org/lldb-gdb.html">side-by-side comparison with
196 GDB</a>.</p>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]197
198</div>
199
200<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]201<h3>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]202<a name="libc++">libc++: C++ Standard Library</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]203</h3>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]204
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]205<div>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]206
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]207<p>Like compiler_rt, libc++ is now <a href="DeveloperPolicy.html#license">dual
208 licensed</a> under the MIT and UIUC license, allowing it to be used more
209 permissively.</p>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]210
211</div>
212
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]213
Chris Lattner3d6a80a2011-04-07 03:08:22 +0000[diff] [blame]214<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]215<h3>
Chris Lattner3d6a80a2011-04-07 03:08:22 +0000[diff] [blame]216<a name="LLBrowse">LLBrowse: IR Browser</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]217</h3>
Daniel Dunbar97b01a82010-10-04 17:39:47 +0000[diff] [blame]218
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]219<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]220
221<p><a href="http://llvm.org/svn/llvm-project/llbrowse/trunk/doc/LLBrowse.html">
222 LLBrowse</a> is an interactive viewer for LLVM modules. It can load any LLVM
223 module and displays its contents as an expandable tree view, facilitating an
224 easy way to inspect types, functions, global variables, or metadata nodes. It
225 is fully cross-platform, being based on the popular wxWidgets GUI
226 toolkit.</p>
227
Chris Lattner3d6a80a2011-04-07 03:08:22 +0000[diff] [blame]228</div>
229
230<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]231<h3>
Chris Lattner3d6a80a2011-04-07 03:08:22 +0000[diff] [blame]232<a name="vmkit">VMKit</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]233</h3>
Chris Lattner3d6a80a2011-04-07 03:08:22 +0000[diff] [blame]234
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]235<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]236
Chris Lattner3d6a80a2011-04-07 03:08:22 +0000[diff] [blame]237<p>The <a href="http://vmkit.llvm.org/">VMKit project</a> is an implementation
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]238 of a Java Virtual Machine (Java VM or JVM) that uses LLVM for static and
239 just-in-time compilation. As of LLVM 3.0, VMKit now supports generational
240 garbage collectors. The garbage collectors are provided by the MMTk
241 framework, and VMKit can be configured to use one of the numerous implemented
242 collectors of MMTk.</p>
243
Chris Lattner3d6a80a2011-04-07 03:08:22 +0000[diff] [blame]244</div>
245
246
Daniel Dunbar97b01a82010-10-04 17:39:47 +0000[diff] [blame]247<!--=========================================================================-->
Chris Lattner7a8e6c52011-04-05 18:38:45 +0000[diff] [blame]248<!--
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]249<h3>
Daniel Dunbar97b01a82010-10-04 17:39:47 +0000[diff] [blame]250<a name="klee">KLEE: A Symbolic Execution Virtual Machine</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]251</h3>
Daniel Dunbar97b01a82010-10-04 17:39:47 +0000[diff] [blame]252
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]253<div>
Daniel Dunbar97b01a82010-10-04 17:39:47 +0000[diff] [blame]254<p>
255<a href="http://klee.llvm.org/">KLEE</a> is a symbolic execution framework for
256programs in LLVM bitcode form. KLEE tries to symbolically evaluate "all" paths
257through the application and records state transitions that lead to fault
258states. This allows it to construct testcases that lead to faults and can even
259be used to verify some algorithms.
260</p>
261
Chris Lattnerbe2e1b52011-03-10 07:43:44 +0000[diff] [blame]262<p>UPDATE!</p>
Chris Lattner7a8e6c52011-04-05 18:38:45 +0000[diff] [blame]263</div>-->
Daniel Dunbar97b01a82010-10-04 17:39:47 +0000[diff] [blame]264
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]265</div>
Daniel Dunbar97b01a82010-10-04 17:39:47 +0000[diff] [blame]266
Chris Lattnerab68e9e2009-02-26 22:33:38 +0000[diff] [blame]267<!-- *********************************************************************** -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]268<h2>
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]269 <a name="externalproj">External Open Source Projects Using LLVM 3.0</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]270</h2>
Chris Lattnerab68e9e2009-02-26 22:33:38 +0000[diff] [blame]271<!-- *********************************************************************** -->
272
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]273<div>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]274
275<p>An exciting aspect of LLVM is that it is used as an enabling technology for
276 a lot of other language and tools projects. This section lists some of the
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]277 projects that have already been updated to work with LLVM 3.0.</p>
Chris Lattner75547712010-10-03 23:49:06 +0000[diff] [blame]278
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]279<!--=========================================================================-->
Bill Wendling7be6bc52011-10-26 00:17:54 +0000[diff] [blame]280<h3>AddressSanitizer</h3>
281
282<div>
283
284<p><a href="http://code.google.com/p/address-sanitizer/">AddressSanitizer</a>
285 uses compiler instrumentation and a specialized malloc library to find C/C++
286 bugs such as use-after-free and out-of-bound accesses to heap, stack, and
287 globals. The key feature of the tool is speed: the average slowdown
288 introduced by AddressSanitizer is less than 2x.</p>
289
290</div>
291
292<!--=========================================================================-->
Bill Wendling29817ea2011-10-26 00:14:36 +0000[diff] [blame]293<h3>ClamAV</h3>
294
295<div>
Bill Wendlingf2a78332011-10-25 01:01:42 +0000[diff] [blame]296
Bill Wendling29817ea2011-10-26 00:14:36 +0000[diff] [blame]297<p><a href="http://www.clamav.net">Clam AntiVirus</a> is an open source (GPL)
298 anti-virus toolkit for UNIX, designed especially for e-mail scanning on mail
299 gateways.</p>
300
301<p>Since version 0.96 it
302 has <a href="http://vrt-sourcefire.blogspot.com/2010/09/introduction-to-clamavs-low-level.html">bytecode
303 signatures</a> that allow writing detections for complex malware.</p>
304
305<p>It uses LLVM's JIT to speed up the execution of bytecode on X86, X86-64,
306 PPC32/64, falling back to its own interpreter otherwise. The git version was
307 updated to work with LLVM 3.0.</p>
308
309</div>
310
311<!--=========================================================================-->
Bill Wendling65d1f412011-10-26 18:23:06 +0000[diff] [blame]312<h3>clReflect</h3>
313
314<div>
315
316<p><a href="https://bitbucket.org/dwilliamson/clreflect">clReflect</a> is a C++
317 parser that uses clang/LLVM to derive a light-weight reflection database
318 suitable for use in game development. It comes with a very simple runtime
319 library for loading and querying the database, requiring no external
320 dependencies (including CRT), and an additional utility library for object
321 management and serialisation.</p>
322
323</div>
324
325<!--=========================================================================-->
Bill Wendling63507d12011-10-29 01:10:01 +0000[diff] [blame]326<h3>Cling C++ Interpreter</h3>
327
328<div>
329
330<p><a href="http://cern.ch/cling">Cling</a> is an interactive compiler interface
331 (aka C++ interpreter). It uses LLVM's JIT and clang; it currently supports
332 C++ and C. It has a prompt interface, runs source files, calls into shared
333 libraries, prints the value of expressions, even does runtime lookup of
334 identifiers (dynamic scopes). And it just behaves like one would expect from
335 an interpreter.</p>
336
337</div>
338
339<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]340<h3>Crack Programming Language</h3>
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]341
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]342<div>
Bill Wendling55d6e672011-11-03 20:10:01 +0000[diff] [blame]343
344<p><a href="http://code.google.com/p/crack-language/">Crack</a> aims to provide
345 the ease of development of a scripting language with the performance of a
346 compiled language. The language derives concepts from C++, Java and Python,
347 incorporating object-oriented programming, operator overloading and strong
348 typing.</p>
349
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]350</div>
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]351
352<!--=========================================================================-->
Bill Wendlingb99486f2011-11-08 05:22:54 +0000[diff] [blame]353<h3>Eero</h3>
354
355<div>
356
357<p><a href="http://eerolanguage.org/">Eero</a> is a fully
358 header-and-binary-compatible dialect of Objective-C 2.0, implemented with a
359 patched version of the Clang/LLVM compiler. It features a streamlined syntax,
360 Python-like indentation, and new operators, for improved readability and
361 reduced code clutter. It also has new features such as limited forms of
362 operator overloading and namespaces, and strict (type-and-operator-safe)
363 enumerations. It is inspired by languages such as Smalltalk, Python, and
364 Ruby.</p>
365
366</div>
367
368<!--=========================================================================-->
Bill Wendlingf9778192011-10-26 00:09:55 +0000[diff] [blame]369<h3>Glasgow Haskell Compiler (GHC)</h3>
370
371<div>
372
373<p>GHC is an open source, state-of-the-art programming suite for Haskell, a
374 standard lazy functional programming language. It includes an optimizing
375 static compiler generating good code for a variety of platforms, together
376 with an interactive system for convenient, quick development.</p>
377
378<p>GHC 7.0 and onwards include an LLVM code generator, supporting LLVM 2.8 and
379 later. Since LLVM 2.9, GHC now includes experimental support for the ARM
380 platform with LLVM 3.0.</p>
381
382</div>
383
384<!--=========================================================================-->
Bill Wendlingf62333d2011-10-25 20:35:31 +0000[diff] [blame]385<h3>gwXscript</h3>
386
387<div>
388
389<p><a href="http://botwars.tk/gwscript/">gwXscript</a> is an object oriented,
Bill Wendling7c38de22011-10-26 04:24:15 +0000[diff] [blame]390 aspect oriented programming language which can create both executables (ELF,
Bill Wendlingf62333d2011-10-25 20:35:31 +0000[diff] [blame]391 EXE) and shared libraries (DLL, SO, DYNLIB). The compiler is implemented in
392 its own language and translates scripts into LLVM-IR which can be optimized
393 and translated into native code by the LLVM framework. Source code in
394 gwScript contains definitions that expand the namespaces. So you can build
395 your project and simply 'plug out' features by removing a file. The remaining
396 project does not leave scars since you directly separate concerns by the
397 'template' feature of gwX. It is also possible to add new features to a
398 project by just adding files and without editing the original project. This
399 language is used for example to create games or content management systems
400 that should be extendable.</p>
401
402<p>gwXscript is strongly typed and offers comfort with its native types string,
403 hash and array. You can easily write new libraries in gwXscript or native
404 code. gwXscript is type safe and users should not be able to crash your
405 program or execute malicious code except code that is eating CPU time.</p>
406
407</div>
408
409<!--=========================================================================-->
Bill Wendling50cacc82011-10-26 22:55:18 +0000[diff] [blame]410<h3>include-what-you-use</h3>
411
412<div>
413
414<p><a href="http://code.google.com/p/include-what-you-use">include-what-you-use</a>
415 is a tool to ensure that a file directly <code>#include</code>s
416 all <code>.h</code> files that provide a symbol that the file uses. It also
417 removes superfluous <code>#include</code>s from source files.</p>
418
419</div>
420
421<!--=========================================================================-->
Bill Wendling32dc4d92011-11-07 22:05:17 +0000[diff] [blame]422<h3>ispc: The Intel SPMD Program Compiler</h3>
423
424<div>
425
426<p><a href="http://ispc.github.com">ispc</a> is a compiler for "single program,
427 multiple data" (SPMD) programs. It compiles a C-based SPMD programming
428 language to run on the SIMD units of CPUs; it often delivers 5-6x speedups on
429 a single core of a CPU with an 8-wide SIMD unit compared to serial code,
430 while still providing a clean and easy-to-understand programming model. For
431 an introduction to the language and its performance,
432 see <a href="http://ispc.github.com/example.html">the walkthrough of a short
433 example program. ispc is licensed under the BSD license.</p>
434
435</div>
436
437<!--=========================================================================-->
Bill Wendling57fd8762011-10-26 18:20:54 +0000[diff] [blame]438<h3>LanguageKit and Pragmatic Smalltalk</h3>
439
440<div>
441
442<p><a href="http://etoileos.com/etoile/features/languagekit/">LanguageKit</a> is
443 a framework for implementing dynamic languages sharing an object model with
444 Objective-C. It provides static and JIT compilation using LLVM along with
445 its own interpreter. Pragmatic Smalltalk is a dialect of Smalltalk, built on
446 top of LanguageKit, that interfaces directly with Objective-C, sharing the
447 same object representation and message sending behaviour. These projects are
448 developed as part of the &Eacute;toi&eacute; desktop environment.</p>
449
450</div>
451
452<!--=========================================================================-->
Bill Wendling03250532011-11-01 04:08:23 +0000[diff] [blame]453<h3>LuaAV</h3>
454
455<div>
456
457<p><a href="http://lua-av.mat.ucsb.edu/blog/">LuaAV</a> is a real-time
458 audiovisual scripting environment based around the Lua language and a
459 collection of libraries for sound, graphics, and other media protocols. LuaAV
460 uses LLVM and Clang to JIT compile efficient user-defined audio synthesis
461 routines specified in a declarative syntax.</p>
462
463</div>
464
465<!--=========================================================================-->
Bill Wendlingd4821b82011-10-26 00:16:17 +0000[diff] [blame]466<h3>Mono</h3>
467
468<div>
469
470<p>An open source, cross-platform implementation of C# and the CLR that is
471 binary compatible with Microsoft.NET. Has an optional, dynamically-loaded
472 LLVM code generation backend in Mini, the JIT compiler.</p>
473
474<p>Note that we use a Git mirror of LLVM with some patches. See:
475 https://github.com/mono/llvm</p>
476
477</div>
478
479<!--=========================================================================-->
Bill Wendlingba226272011-10-25 20:37:45 +0000[diff] [blame]480<h3>Portable OpenCL (pocl)</h3>
481
482<div>
483
484<p>Portable OpenCL is an open source implementation of the OpenCL standard which
485 can be easily adapted for new targets. One of the goals of the project is
486 improving performance portability of OpenCL programs, avoiding the need for
487 target-dependent manual optimizations. A "native" target is included, which
488 allows running OpenCL kernels on the host (CPU).</p>
489
490</div>
491
492<!--=========================================================================-->
Bill Wendling0bad98c2011-10-25 20:39:06 +0000[diff] [blame]493<h3>Pure</h3>
494
495<div>
496<p><a href="http://pure-lang.googlecode.com/">Pure</a> is an
497 algebraic/functional programming language based on term rewriting. Programs
498 are collections of equations which are used to evaluate expressions in a
499 symbolic fashion. The interpreter uses LLVM as a backend to JIT-compile Pure
500 programs to fast native code. Pure offers dynamic typing, eager and lazy
501 evaluation, lexical closures, a hygienic macro system (also based on term
502 rewriting), built-in list and matrix support (including list and matrix
503 comprehensions) and an easy-to-use interface to C and other programming
504 languages (including the ability to load LLVM bitcode modules, and inline C,
505 C++, Fortran and Faust code in Pure programs if the corresponding LLVM-enabled
506 compilers are installed).</p>
507
508<p>Pure version 0.48 has been tested and is known to work with LLVM 3.0
509 (and continues to work with older LLVM releases &gt;= 2.5).</p>
510
511</div>
512
513<!--=========================================================================-->
Bill Wendling537d85b2011-10-26 00:12:04 +0000[diff] [blame]514<h3>Renderscript</h3>
515
516<div>
517
518<p><a href="http://developer.android.com/guide/topics/renderscript/index.html">Renderscript</a>
519 is Android's advanced 3D graphics rendering and compute API. It provides a
520 portable C99-based language with extensions to facilitate common use cases
521 for enhancing graphics and thread level parallelism. The Renderscript
522 compiler frontend is based on Clang/LLVM. It emits a portable bitcode format
523 for the actual compiled script code, as well as reflects a Java interface for
524 developers to control the execution of the compiled bitcode. Executable
525 machine code is then generated from this bitcode by an LLVM backend on the
526 device. Renderscript is thus able to provide a mechanism by which Android
527 developers can improve performance of their applications while retaining
528 portability.</p>
529
530</div>
531
532<!--=========================================================================-->
Bill Wendling7d5b6212011-10-25 20:40:26 +0000[diff] [blame]533<h3>SAFECode</h3>
534
535<div>
536
537<p><a href="http://safecode.cs.illinois.edu">SAFECode</a> is a memory safe C/C++
538 compiler built using LLVM. It takes standard, unannotated C/C++ code,
539 analyzes the code to ensure that memory accesses and array indexing
540 operations are safe, and instruments the code with run-time checks when
541 safety cannot be proven statically. SAFECode can be used as a debugging aid
542 (like Valgrind) to find and repair memory safety bugs. It can also be used
543 to protect code from security attacks at run-time.</p>
544
545</div>
546
547<!--=========================================================================-->
Bill Wendling02b77b72011-10-26 07:38:19 +0000[diff] [blame]548<h3>The Stupid D Compiler (SDC)</h3>
549
550<div>
551
552<p><a href="https://github.com/bhelyer/SDC">The Stupid D Compiler</a> is a
553 project seeking to write a self-hosting compiler for the D programming
554 language without using the frontend of the reference compiler (DMD).</p>
555
556</div>
557
558<!--=========================================================================-->
Bill Wendling2d7b4af2011-10-25 20:24:32 +0000[diff] [blame]559<h3>TTA-based Co-design Environment (TCE)</h3>
560
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]561<div>
Bill Wendling2d7b4af2011-10-25 20:24:32 +0000[diff] [blame]562
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]563<p>TCE is a toolset for designing application-specific processors (ASP) based on
Bill Wendling2d7b4af2011-10-25 20:24:32 +0000[diff] [blame]564 the Transport triggered architecture (TTA). The toolset provides a complete
565 co-design flow from C/C++ programs down to synthesizable VHDL and parallel
566 program binaries. Processor customization points include the register files,
567 function units, supported operations, and the interconnection network.</p>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]568
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]569<p>TCE uses Clang and LLVM for C/C++ language support, target independent
Bill Wendling2d7b4af2011-10-25 20:24:32 +0000[diff] [blame]570 optimizations and also for parts of code generation. It generates new
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]571 LLVM-based code generators "on the fly" for the designed TTA processors and
572 loads them in to the compiler backend as runtime libraries to avoid
Bill Wendling2d7b4af2011-10-25 20:24:32 +0000[diff] [blame]573 per-target recompilation of larger parts of the compiler chain.</p>
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]574
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]575</div>
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]576
577<!--=========================================================================-->
Bill Wendling628c2662011-10-25 20:27:37 +0000[diff] [blame]578<h3>Tart Programming Language</h3>
579
580<div>
581
582<p><a href="http://code.google.com/p/tart/">Tart</a> is a general-purpose,
583 strongly typed programming language designed for application
584 developers. Strongly inspired by Python and C#, Tart focuses on practical
585 solutions for the professional software developer, while avoiding the clutter
586 and boilerplate of legacy languages like Java and C++. Although Tart is still
587 in development, the current implementation supports many features expected of
588 a modern programming language, such as garbage collection, powerful
589 bidirectional type inference, a greatly simplified syntax for template
590 metaprogramming, closures and function literals, reflection, operator
591 overloading, explicit mutability and immutability, and much more. Tart is
592 flexible enough to accommodate a broad range of programming styles and
593 philosophies, while maintaining a strong commitment to simplicity, minimalism
594 and elegance in design.</p>
595
596</div>
597
598<!--=========================================================================-->
Bill Wendling644ce532011-10-26 09:25:01 +0000[diff] [blame]599<h3>ThreadSanitizer</h3>
600
601<div>
602
603<p><a href="http://code.google.com/p/data-race-test/">ThreadSanitizer</a> is a
604 data race detector for (mostly) C and C++ code, available for Linux, Mac OS
605 and Windows. On different systems, we use binary instrumentation frameworks
Bill Wendlingae8538e2011-10-29 01:11:15 +0000[diff] [blame]606 (Valgrind and Pin) as frontends that generate the program events for the race
607 detection algorithm. On Linux, there's an option of using LLVM-based
608 compile-time instrumentation.</p>
Bill Wendling644ce532011-10-26 09:25:01 +0000[diff] [blame]609
610</div>
611
612<!--=========================================================================-->
Bill Wendling8a924c62011-10-26 07:42:45 +0000[diff] [blame]613<h3>The ZooLib C++ Cross-Platform Application Framework</h3>
614
615<div>
616
617<p><a href="http://www.zoolib.org/">ZooLib</a> is Open Source under the MIT
618 License. It provides GUI, filesystem access, TCP networking, thread-safe
619 memory management, threading and locking for Mac OS X, Classic Mac OS,
620 Microsoft Windows, POSIX operating systems with X11, BeOS, Haiku, Apple's iOS
621 and Research in Motion's BlackBerry.</p>
622
623<p>My current work is to use CLang's static analyzer to improve ZooLib's code
624 quality. I also plan to set up LLVM compiles of the demo programs and test
625 programs using CLang and LLVM on all the platforms that CLang, LLVM and
626 ZooLib all support.</p>
627
628</div>
629
630<!--=========================================================================-->
Bill Wendlingf2a78332011-10-25 01:01:42 +0000[diff] [blame]631<!--
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]632<h3>PinaVM</h3>
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]633
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]634<div>
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]635<p><a href="http://gitorious.org/pinavm/pages/Home">PinaVM</a> is an open
636source, <a href="http://www.systemc.org/">SystemC</a> front-end. Unlike many
637other front-ends, PinaVM actually executes the elaboration of the
638program analyzed using LLVM's JIT infrastructure. It later enriches the
639bitcode with SystemC-specific information.</p>
640</div>
Bill Wendlingf2a78332011-10-25 01:01:42 +0000[diff] [blame]641-->
642
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]643
644<!--=========================================================================-->
Bill Wendlingf2a78332011-10-25 01:01:42 +0000[diff] [blame]645<!--
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]646<h3 id="icedtea">IcedTea Java Virtual Machine Implementation</h3>
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]647
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]648<div>
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]649<p>
650<a href="http://icedtea.classpath.org/wiki/Main_Page">IcedTea</a> provides a
651harness to build OpenJDK using only free software build tools and to provide
652replacements for the not-yet free parts of OpenJDK. One of the extensions that
653IcedTea provides is a new JIT compiler named <a
654href="http://icedtea.classpath.org/wiki/ZeroSharkFaq">Shark</a> which uses LLVM
655to provide native code generation without introducing processor-dependent
656code.
657</p>
658
659<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]660and 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]661releases &gt;= 2.6 as well).</p>
662</div>
Bill Wendlingf2a78332011-10-25 01:01:42 +0000[diff] [blame]663-->
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]664
665<!--=========================================================================-->
Bill Wendlingf2a78332011-10-25 01:01:42 +0000[diff] [blame]666<!--
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]667<h3>Polly - Polyhedral optimizations for LLVM</h3>
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]668
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]669<div>
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]670<p>Polly is a project that aims to provide advanced memory access optimizations
671to better take advantage of SIMD units, cache hierarchies, multiple cores or
672even vector accelerators for LLVM. Built around an abstract mathematical
673description based on Z-polyhedra, it provides the infrastructure to develop
674advanced optimizations in LLVM and to connect complex external optimizers. In
675its first year of existence Polly already provides an exact value-based
676dependency analysis as well as basic SIMD and OpenMP code generation support.
677Furthermore, Polly can use PoCC(Pluto) an advanced optimizer for data-locality
678and parallelism.</p>
679</div>
Bill Wendlingf2a78332011-10-25 01:01:42 +0000[diff] [blame]680-->
Chris Lattner75547712010-10-03 23:49:06 +0000[diff] [blame]681
Chris Lattner0fa5da92011-04-06 16:14:25 +0000[diff] [blame]682<!--=========================================================================-->
Bill Wendlingf2a78332011-10-25 01:01:42 +0000[diff] [blame]683<!--
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]684<h3>Rubinius</h3>
Chris Lattner0fa5da92011-04-06 16:14:25 +0000[diff] [blame]685
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]686<div>
Chris Lattner0fa5da92011-04-06 16:14:25 +0000[diff] [blame]687 <p><a href="http://github.com/evanphx/rubinius">Rubinius</a> is an environment
688 for running Ruby code which strives to write as much of the implementation in
689 Ruby as possible. Combined with a bytecode interpreting VM, it uses LLVM to
690 optimize and compile ruby code down to machine code. Techniques such as type
691 feedback, method inlining, and deoptimization are all used to remove dynamism
692 from ruby execution and increase performance.</p>
693</div>
Bill Wendlingf2a78332011-10-25 01:01:42 +0000[diff] [blame]694-->
Chris Lattner0fa5da92011-04-06 16:14:25 +0000[diff] [blame]695
Chris Lattnera844a3e2011-04-07 03:09:21 +0000[diff] [blame]696<!--=========================================================================-->
Bill Wendlingf2a78332011-10-25 01:01:42 +0000[diff] [blame]697<!--
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]698<h3>
Chris Lattnera844a3e2011-04-07 03:09:21 +0000[diff] [blame]699<a name="FAUST">FAUST Real-Time Audio Signal Processing Language</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]700</h3>
Chris Lattnere0518442010-10-01 06:34:49 +0000[diff] [blame]701
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]702<div>
Chris Lattnera844a3e2011-04-07 03:09:21 +0000[diff] [blame]703<p>
704<a href="http://faust.grame.fr">FAUST</a> is a compiled language for real-time
705audio signal processing. The name FAUST stands for Functional AUdio STream. Its
706programming model combines two approaches: functional programming and block
707diagram composition. In addition with the C, C++, JAVA output formats, the
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]708Faust 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]709
710</div>
Bill Wendlingf2a78332011-10-25 01:01:42 +0000[diff] [blame]711-->
Chris Lattnera844a3e2011-04-07 03:09:21 +0000[diff] [blame]712
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]713</div>
714
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]715<!-- *********************************************************************** -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]716<h2>
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]717 <a name="whatsnew">What's New in LLVM 3.0?</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]718</h2>
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]719<!-- *********************************************************************** -->
720
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]721<div>
Chris Lattnerf8e0b4e2008-06-08 22:59:35 +0000[diff] [blame]722
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]723<p>This release includes a huge number of bug fixes, performance tweaks and
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]724 minor improvements. Some of the major improvements and new features are
725 listed in this section.</p>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]726
Chris Lattner914ce462010-04-22 06:28:20 +0000[diff] [blame]727<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]728<h3>
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]729<a name="majorfeatures">Major New Features</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]730</h3>
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]731
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]732<div>
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]733
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]734<p>LLVM 3.0 includes several major new capabilities:</p>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]735
736<ul>
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]737
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]738<!--
739<li></li>
740-->
Chris Lattner7a8e6c52011-04-05 18:38:45 +0000[diff] [blame]741
Chris Lattner8170c102008-02-10 08:18:42 +0000[diff] [blame]742</ul>
Chris Lattner0a6f6d52011-04-05 07:19:28 +0000[diff] [blame]743
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]744</div>
745
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]746<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]747<h3>
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]748<a name="coreimprovements">LLVM IR and Core Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]749</h3>
Chris Lattnerf304ffc2008-02-10 08:17:19 +0000[diff] [blame]750
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]751<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]752
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]753<p>LLVM IR has several new features for better support of new targets and that
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]754 expose new optimization opportunities:</p>
Chris Lattnerf304ffc2008-02-10 08:17:19 +0000[diff] [blame]755
Bill Wendlingbc5f6dd2011-10-26 18:33:01 +0000[diff] [blame]756<p>One of the biggest changes is that 3.0 has a new exception handling
757 system. The old system used LLVM intrinsics to convey the exception handling
758 information to the code generator. It worked in most cases, but not
759 all. Inlining was especially difficult to get right. Also, the intrinsics
760 could be moved away from the <code>invoke</code> instruction, making it hard
761 to recover that information.</p>
762
763<p>The new EH system makes exception handling a first-class member of the IR. It
764 adds two new instructions:</p>
765
Chris Lattner791f77b2008-06-05 06:25:56 +0000[diff] [blame]766<ul>
Bill Wendlingbc5f6dd2011-10-26 18:33:01 +0000[diff] [blame]767 <li><a href="LangRef.html#i_landingpad"><code>landingpad</code></a> &mdash;
768 this instruction defines a landing pad basic block. It contains all of the
769 information that's needed by the code generator. It's also required to be
770 the first non-PHI instruction in the landing pad. In addition, a landing
771 pad may be jumped to only by the unwind edge of an <code>invoke</code>
772 instruction.</li>
773
774 <li><a href="LangRef.html#i_resume"><code>resume</code></a> &mdash; this
775 instruction causes the current exception to resume traveling up the
776 stack. It replaces the <code>@llvm.eh.resume</code> intrinsic.</li>
Chris Lattnerf304ffc2008-02-10 08:17:19 +0000[diff] [blame]777</ul>
Mikhail Glushenkovea65d7d2008-10-13 02:08:34 +0000[diff] [blame]778
Bill Wendlingbc5f6dd2011-10-26 18:33:01 +0000[diff] [blame]779<p>Converting from the old EH API to the new EH API is rather simple, because a
780 lot of complexity has been removed. The two intrinsics,
781 <code>@llvm.eh.exception</code> and <code>@llvm.eh.selector</code> have been
782 superceded by the <code>landingpad</code> instruction. Instead of generating
783 a call to <code>@llvm.eh.exception</code> and <code>@llvm.eh.selector</code>:
784
785<div class="doc_code">
786<pre>
787Function *ExcIntr = Intrinsic::getDeclaration(TheModule,
788 Intrinsic::eh_exception);
789Function *SlctrIntr = Intrinsic::getDeclaration(TheModule,
790 Intrinsic::eh_selector);
791
792// The exception pointer.
793Value *ExnPtr = Builder.CreateCall(ExcIntr, "exc_ptr");
794
795std::vector&lt;Value*&gt; Args;
796Args.push_back(ExnPtr);
797Args.push_back(Builder.CreateBitCast(Personality,
798 Type::getInt8PtrTy(Context)));
799
800<i>// Add selector clauses to Args.</i>
801
802// The selector call.
803Builder.CreateCall(SlctrIntr, Args, "exc_sel");
804</pre>
805</div>
806
807<p>You should instead generate a <code>landingpad</code> instruction, that
808 returns an exception object and selector value:</p>
809
810<div class="doc_code">
811<pre>
812LandingPadInst *LPadInst =
813 Builder.CreateLandingPad(StructType::get(Int8PtrTy, Int32Ty, NULL),
814 Personality, 0);
815
816Value *LPadExn = Builder.CreateExtractValue(LPadInst, 0);
817Builder.CreateStore(LPadExn, getExceptionSlot());
818
819Value *LPadSel = Builder.CreateExtractValue(LPadInst, 1);
820Builder.CreateStore(LPadSel, getEHSelectorSlot());
821</pre>
822</div>
823
824<p>It's now trivial to add the individual clauses to the <code>landingpad</code>
825 instruction.</p>
826
827<div class="doc_code">
828<pre>
829<i><b>// Adding a catch clause</b></i>
830Constant *TypeInfo = getTypeInfo();
831LPadInst-&gt;addClause(TypeInfo);
832
833<i><b>// Adding a C++ catch-all</b></i>
834LPadInst-&gt;addClause(Constant::getNullValue(Builder.getInt8PtrTy()));
835
836<i><b>// Adding a cleanup</b></i>
837LPadInst-&gt;setCleanup(true);
838
839<i><b>// Adding a filter clause</b></i>
840std::vector&lt;Constant*&gt; TypeInfos;
841Constant *TypeInfo = getFilterTypeInfo();
842TypeInfos.push_back(Builder.CreateBitCast(TypeInfo, Builder.getInt8PtrTy()));
843
844ArrayType *FilterTy = ArrayType::get(Int8PtrTy, TypeInfos.size());
845LPadInst-&gt;addClause(ConstantArray::get(FilterTy, TypeInfos));
846</pre>
847</div>
848
849<p>Converting from using the <code>@llvm.eh.resume</code> intrinsic to
850 the <code>resume</code> instruction is trivial. It takes the exception
851 pointer and exception selector values returned by
852 the <code>landingpad</code> instruction:</p>
853
854<div class="doc_code">
855<pre>
856Type *UnwindDataTy = StructType::get(Builder.getInt8PtrTy(),
857 Builder.getInt32Ty(), NULL);
858Value *UnwindData = UndefValue::get(UnwindDataTy);
859Value *ExcPtr = Builder.CreateLoad(getExceptionObjSlot());
860Value *ExcSel = Builder.CreateLoad(getExceptionSelSlot());
861UnwindData = Builder.CreateInsertValue(UnwindData, ExcPtr, 0, "exc_ptr");
862UnwindData = Builder.CreateInsertValue(UnwindData, ExcSel, 1, "exc_sel");
863Builder.CreateResume(UnwindData);
864</pre>
865</div>
866
Chris Lattnerf304ffc2008-02-10 08:17:19 +0000[diff] [blame]867</div>
868
869<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]870<h3>
Andrew Trick5aab6382011-11-06 17:59:24 +0000[diff] [blame]871<a name="loopoptimization">Loop Optimization Improvements</a>
872</h3>
873
874<div>
875<p>The induction variable simplification pass in 3.0 only modifies
876 induction variables when profitable. Sign and zero extension
877 elimination, linear function test replacement, loop unrolling, and
878 other simplifications that require induction variable analysis have
879 been generalized so they no longer require loops to be rewritten in a
880 typically suboptimal form prior to optimization. This new design
881 preserves more IR level information, avoids undoing earlier loop
882 optimizations (particularly hand-optimized loops), and no longer
883 strongly depends on the code generator rewriting loops a second time
884 in a now optimal form--an intractable problem.</p>
885
886<p>The original behavior can be restored with -mllvm -enable-iv-rewrite;
887 however, support for this mode will be short lived. As such, bug
888 reports should be filed for any significant performance regressions
889 when moving from -mllvm -enable-iv-rewrite to the 3.0 default mode.</p>
890</div>
891
892<!--=========================================================================-->
893<h3>
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]894<a name="optimizer">Optimizer Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]895</h3>
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]896
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]897<div>
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]898
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]899<p>In addition to a large array of minor performance tweaks and bug fixes, this
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]900 release includes a few major enhancements and additions to the
901 optimizers:</p>
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]902
903<ul>
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]904<!--
905<li></li>
906-->
Chris Lattnerc5ac61d2011-04-06 05:50:04 +0000[diff] [blame]907</li>
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]908
Chris Lattner11b66112010-10-04 02:42:39 +0000[diff] [blame]909</ul>
910
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]911</div>
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]912
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]913<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]914<h3>
Chris Lattner4ba2b652010-09-30 16:31:33 +0000[diff] [blame]915<a name="mc">MC Level Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]916</h3>
Chris Lattner4ba2b652010-09-30 16:31:33 +0000[diff] [blame]917
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]918<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]919
920<p>The LLVM Machine Code (aka MC) subsystem was created to solve a number of
921 problems in the realm of assembly, disassembly, object file format handling,
922 and a number of other related areas that CPU instruction-set level tools work
923 in.</p>
Chris Lattner7d9b6b42010-10-02 21:59:30 +0000[diff] [blame]924
Chris Lattner7d9b6b42010-10-02 21:59:30 +0000[diff] [blame]925<ul>
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]926<!--
927<li></li>
928-->
Chris Lattner7d9b6b42010-10-02 21:59:30 +0000[diff] [blame]929</ul>
930
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]931<p>For more information, please see
932 the <a href="http://blog.llvm.org/2010/04/intro-to-llvm-mc-project.html">Intro
933 to the LLVM MC Project Blog Post</a>.</p>
Chris Lattner4ba2b652010-09-30 16:31:33 +0000[diff] [blame]934
NAKAMURA Takumi45c435a2011-04-05 08:24:22 +0000[diff] [blame]935</div>
Chris Lattner4ba2b652010-09-30 16:31:33 +0000[diff] [blame]936
Chris Lattner4ba2b652010-09-30 16:31:33 +0000[diff] [blame]937<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]938<h3>
Chris Lattner511433e2009-03-02 03:24:11 +0000[diff] [blame]939<a name="codegen">Target Independent Code Generator Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]940</h3>
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]941
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]942<div>
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]943
Mikhail Glushenkovf795ef02009-03-01 18:09:47 +0000[diff] [blame]944<p>We have put a significant amount of work into the code generator
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]945 infrastructure, which allows us to implement more aggressive algorithms and
946 make it run faster:</p>
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]947
948<ul>
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]949<!--
950<li></li>
951-->
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]952</ul>
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]953</div>
954
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]955<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]956<h3>
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]957<a name="x86">X86-32 and X86-64 Target Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]958</h3>
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]959
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]960<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]961
962<p>New features and major changes in the X86 target include:</p>
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]963
964<ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]965
966 <li>The CRC32 intrinsics have been renamed. The intrinsics were previously
967 <code>@llvm.x86.sse42.crc32.[8|16|32]</code>
968 and <code>@llvm.x86.sse42.crc64.[8|64]</code>. They have been renamed to
969 <code>@llvm.x86.sse42.crc32.32.[8|16|32]</code> and
970 <code>@llvm.x86.sse42.crc32.64.[8|64]</code>.</li>
Chad Rosierf94c9c12011-05-27 20:13:10 +0000[diff] [blame]971
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]972</ul>
973
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]974</div>
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]975
976<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]977<h3>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]978<a name="ARM">ARM Target Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]979</h3>
Chris Lattnerc441fb82009-03-01 02:30:21 +0000[diff] [blame]980
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]981<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]982
983<p>New features of the ARM target include:</p>
Chris Lattnerc441fb82009-03-01 02:30:21 +0000[diff] [blame]984
985<ul>
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]986<!--
987<li></li>
988-->
Bob Wilsone8472772010-09-13 17:39:35 +0000[diff] [blame]989</ul>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]990</div>
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]991
992<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]993<h3>
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]994<a name="OtherTS">Other Target Specific Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]995</h3>
Chris Lattnerc441fb82009-03-01 02:30:21 +0000[diff] [blame]996
Roman Divacky223764c2011-10-30 07:49:04 +0000[diff] [blame]997<p>PPC32/ELF va_arg was implemented.</p>
998<p>PPC32 initial support for .o file writing was implemented.</p>
999
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1000<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1001
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]1002<ul>
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]1003<!--
1004<li></li>
1005-->
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]1006</ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1007
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]1008</div>
Chris Lattner77d29b12008-06-05 08:02:49 +0000[diff] [blame]1009
1010<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1011<h3>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]1012<a name="changes">Major Changes and Removed Features</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1013</h3>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]1014
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1015<div>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]1016
Bill Wendling2626dba2011-08-03 22:18:20 +0000[diff] [blame]1017<p>If you're already an LLVM user or developer with out-of-tree changes based on
1018 LLVM 2.9, this section lists some "gotchas" that you may run into upgrading
1019 from the previous release.</p>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]1020
1021<ul>
Eric Christopher90d6ec52011-09-28 19:47:28 +0000[diff] [blame]1022 <li>The <code>LLVMC</code> front end code was removed while separating
1023 out language independence.</li>
Jay Foadf42e9b22011-08-04 10:43:43 +0000[diff] [blame]1024 <li>The <code>LowerSetJmp</code> pass wasn't used effectively by any
1025 target and has been removed.</li>
Rafael Espindolaf940a1a2011-08-30 23:03:45 +0000[diff] [blame]1026 <li>The old <code>TailDup</code> pass was not used in the standard pipeline
1027 and was unable to update ssa form, so it has been removed.
Eli Friedmanf03bb262011-08-12 22:50:01 +0000[diff] [blame]1028 <li>The syntax of volatile loads and stores in IR has been changed to
1029 "<code>load volatile</code>"/"<code>store volatile</code>". The old
1030 syntax ("<code>volatile load</code>"/"<code>volatile store</code>")
1031 is still accepted, but is now considered deprecated.</li>
Eli Friedman526e1bb2011-10-26 00:55:23 +0000[diff] [blame]1032 <li>The old atomic intrinscs (<code>llvm.memory.barrier</code> and
1033 <code>llvm.atomic.*</code>) are now gone. Please use the new atomic
1034 instructions, described in the <a href="Atomics.html">atomics guide</a>.
Devang Patelb34dd132008-10-14 20:03:43 +0000[diff] [blame]1035</ul>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]1036
NAKAMURA Takumi2026de22011-08-22 23:22:05 +0000[diff] [blame]1037<h4>Windows (32-bit)</h4>
1038<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1039
NAKAMURA Takumi2026de22011-08-22 23:22:05 +0000[diff] [blame]1040<ul>
1041 <li>On Win32(MinGW32 and MSVC), Windows 2000 will not be supported.
1042 Windows XP or higher is required.</li>
1043</ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1044
NAKAMURA Takumi2026de22011-08-22 23:22:05 +0000[diff] [blame]1045</div>
1046
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]1047</div>
1048
Daniel Dunbarf0233c62010-10-04 20:11:41 +0000[diff] [blame]1049<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1050<h3>
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]1051<a name="api_changes">Internal API Changes</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1052</h3>
Daniel Dunbarf0233c62010-10-04 20:11:41 +0000[diff] [blame]1053
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1054<div>
Daniel Dunbarf0233c62010-10-04 20:11:41 +0000[diff] [blame]1055
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]1056<p>In addition, many APIs have changed in this release. Some of the major
Bill Wendling16005252011-08-02 06:20:17 +0000[diff] [blame]1057 LLVM API changes are:</p>
Daniel Dunbarf0233c62010-10-04 20:11:41 +0000[diff] [blame]1058
1059<ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1060 <li>The biggest and most pervasive change is that llvm::Type's are no longer
1061 returned or accepted as 'const' values. Instead, just pass around
1062 non-const Type's.</li>
Chris Lattnerd1324302011-07-18 04:56:02 +0000[diff] [blame]1063
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1064 <li><code>PHINode::reserveOperandSpace</code> has been removed. Instead, you
1065 must specify how many operands to reserve space for when you create the
1066 PHINode, by passing an extra argument
1067 into <code>PHINode::Create</code>.</li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]1068
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1069 <li>PHINodes no longer store their incoming BasicBlocks as operands. Instead,
1070 the list of incoming BasicBlocks is stored separately, and can be accessed
1071 with new functions <code>PHINode::block_begin</code>
1072 and <code>PHINode::block_end</code>.</li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]1073
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1074 <li>Various functions now take an <code>ArrayRef</code> instead of either a
1075 pair of pointers (or iterators) to the beginning and end of a range, or a
1076 pointer and a length. Others now return an <code>ArrayRef</code> instead
1077 of a reference to a <code>SmallVector</code>
1078 or <code>std::vector</code>. These include:
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]1079<ul>
1080<!-- Please keep this list sorted. -->
Jay Foada3efbb12011-07-15 08:37:34 +0000[diff] [blame]1081<li><code>CallInst::Create</code></li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]1082<li><code>ComputeLinearIndex</code> (in <code>llvm/CodeGen/Analysis.h</code>)</li>
1083<li><code>ConstantArray::get</code></li>
1084<li><code>ConstantExpr::getExtractElement</code></li>
Jay Foaddab3d292011-07-21 14:31:17 +0000[diff] [blame]1085<li><code>ConstantExpr::getGetElementPtr</code></li>
1086<li><code>ConstantExpr::getInBoundsGetElementPtr</code></li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]1087<li><code>ConstantExpr::getIndices</code></li>
1088<li><code>ConstantExpr::getInsertElement</code></li>
1089<li><code>ConstantExpr::getWithOperands</code></li>
Jay Foad1d2f5692011-07-19 13:32:40 +0000[diff] [blame]1090<li><code>ConstantFoldCall</code> (in <code>llvm/Analysis/ConstantFolding.h</code>)</li>
1091<li><code>ConstantFoldInstOperands</code> (in <code>llvm/Analysis/ConstantFolding.h</code>)</li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]1092<li><code>ConstantVector::get</code></li>
1093<li><code>DIBuilder::createComplexVariable</code></li>
1094<li><code>DIBuilder::getOrCreateArray</code></li>
1095<li><code>ExtractValueInst::Create</code></li>
1096<li><code>ExtractValueInst::getIndexedType</code></li>
1097<li><code>ExtractValueInst::getIndices</code></li>
1098<li><code>FindInsertedValue</code> (in <code>llvm/Analysis/ValueTracking.h</code>)</li>
Jay Foadca12a212011-07-19 14:42:50 +0000[diff] [blame]1099<li><code>gep_type_begin</code> (in <code>llvm/Support/GetElementPtrTypeIterator.h</code>)</li>
1100<li><code>gep_type_end</code> (in <code>llvm/Support/GetElementPtrTypeIterator.h</code>)</li>
Jay Foada9203102011-07-25 09:48:08 +0000[diff] [blame]1101<li><code>GetElementPtrInst::Create</code></li>
1102<li><code>GetElementPtrInst::CreateInBounds</code></li>
1103<li><code>GetElementPtrInst::getIndexedType</code></li>
Jay Foadb60e8512011-07-21 14:42:51 +0000[diff] [blame]1104<li><code>InsertValueInst::Create</code></li>
1105<li><code>InsertValueInst::getIndices</code></li>
1106<li><code>InvokeInst::Create</code></li>
Jay Foada3efbb12011-07-15 08:37:34 +0000[diff] [blame]1107<li><code>IRBuilder::CreateCall</code></li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]1108<li><code>IRBuilder::CreateExtractValue</code></li>
Jay Foad0a2a60a2011-07-22 08:16:57 +0000[diff] [blame]1109<li><code>IRBuilder::CreateGEP</code></li>
1110<li><code>IRBuilder::CreateInBoundsGEP</code></li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]1111<li><code>IRBuilder::CreateInsertValue</code></li>
Jay Foada3efbb12011-07-15 08:37:34 +0000[diff] [blame]1112<li><code>IRBuilder::CreateInvoke</code></li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]1113<li><code>MDNode::get</code></li>
1114<li><code>MDNode::getIfExists</code></li>
1115<li><code>MDNode::getTemporary</code></li>
1116<li><code>MDNode::getWhenValsUnresolved</code></li>
Jay Foadb9b54eb2011-07-19 15:07:52 +0000[diff] [blame]1117<li><code>SimplifyGEPInst</code> (in <code>llvm/Analysis/InstructionSimplify.h</code>)</li>
Jay Foad8fbbb392011-07-19 14:01:37 +0000[diff] [blame]1118<li><code>TargetData::getIndexedOffset</code></li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]1119</ul></li>
1120
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1121 <li>All forms of <code>StringMap::getOrCreateValue</code> have been remove
1122 except for the one which takes a <code>StringRef</code>.</li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]1123
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1124 <li>The <code>LLVMBuildUnwind</code> function from the C API was removed. The
1125 LLVM <code>unwind</code> instruction has been deprecated for a long time
1126 and isn't used by the current front-ends. So this was removed during the
1127 exception handling rewrite.</li>
Bill Wendling16005252011-08-02 06:20:17 +0000[diff] [blame]1128
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1129 <li>The <code>LLVMAddLowerSetJmpPass</code> function from the C API was
1130 removed because the <code>LowerSetJmp</code> pass was removed.</li>
Bill Wendling2626dba2011-08-03 22:18:20 +0000[diff] [blame]1131
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1132 <li>The <code>DIBuilder</code> interface used by front ends to encode
1133 debugging information in the LLVM IR now expects clients to
1134 use <code>DIBuilder::finalize()</code> at the end of translation unit to
1135 complete debugging information encoding.</li>
Devang Patel6326a422011-08-15 23:00:00 +0000[diff] [blame]1136
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1137 <li>The way the type system works has been
1138 rewritten: <code>PATypeHolder</code> and <code>OpaqueType</code> are gone,
1139 and all APIs deal with <code>Type*</code> instead of <code>const
1140 Type*</code>. If you need to create recursive structures, then create a
1141 named structure, and use <code>setBody()</code> when all its elements are
1142 built. Type merging and refining is gone too: named structures are not
1143 merged with other structures, even if their layout is identical. (of
1144 course anonymous structures are still uniqued by layout).</li>
Torok Edwinf16e2d42011-09-30 13:07:52 +0000[diff] [blame]1145
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1146 <li>TargetSelect.h moved to Support/ from Target/</li>
Torok Edwinf16e2d42011-09-30 13:07:52 +0000[diff] [blame]1147
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1148 <li>UpgradeIntrinsicCall no longer upgrades pre-2.9 intrinsic calls (for
1149 example <code>llvm.memset.i32</code>).</li>
Torok Edwinf16e2d42011-09-30 13:07:52 +0000[diff] [blame]1150
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1151 <li>It is mandatory to initialize all out-of-tree passes too and their dependencies now with
1152 <code>INITIALIZE_PASS{BEGIN,END,}</code>
1153 and <code>INITIALIZE_{PASS,AG}_DEPENDENCY</code>.</li>
Torok Edwinf16e2d42011-09-30 13:07:52 +0000[diff] [blame]1154
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1155 <li>The interface for MemDepResult in MemoryDependenceAnalysis has been
1156 enhanced with new return types Unknown and NonFuncLocal, in addition to
1157 the existing types Clobber, Def, and NonLocal.</li>
Daniel Dunbarf0233c62010-10-04 20:11:41 +0000[diff] [blame]1158</ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1159
Daniel Dunbarf0233c62010-10-04 20:11:41 +0000[diff] [blame]1160</div>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]1161
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1162</div>
1163
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1164<!-- *********************************************************************** -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1165<h2>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1166 <a name="knownproblems">Known Problems</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1167</h2>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1168<!-- *********************************************************************** -->
1169
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1170<div>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1171
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1172<p>This section contains significant known problems with the LLVM system, listed
1173 by component. If you run into a problem, please check
1174 the <a href="http://llvm.org/bugs/">LLVM bug database</a> and submit a bug if
1175 there isn't already one.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1176
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]1177<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1178<h3>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]1179 <a name="experimental">Experimental features included with this release</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1180</h3>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1181
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1182<div>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]1183
Misha Brukman6df9e2c2004-05-12 21:46:05 +0000[diff] [blame]1184<p>The following components of this LLVM release are either untested, known to
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1185 be broken or unreliable, or are in early development. These components
1186 should not be relied on, and bugs should not be filed against them, but they
1187 may be useful to some people. In particular, if you would like to work on
1188 one of these components, please contact us on
1189 the <a href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVMdev
1190 list</a>.</p>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]1191
1192<ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1193 <li>The Alpha, Blackfin, CellSPU, MicroBlaze, MSP430, MIPS, PTX, SystemZ and
1194 XCore backends are experimental.</li>
1195
1196 <li><tt>llc</tt> "<tt>-filetype=obj</tt>" is experimental on all targets other
1197 than darwin and ELF X86 systems.</li>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]1198</ul>
1199
1200</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1201
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1202<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1203<h3>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1204 <a name="x86-be">Known problems with the X86 back-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1205</h3>
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]1206
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1207<div>
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]1208
1209<ul>
Anton Korobeynikova6094be2008-06-08 10:24:13 +0000[diff] [blame]1210 <li>The X86 backend does not yet support
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1211 all <a href="http://llvm.org/PR879">inline assembly that uses the X86
1212 floating point stack</a>. It supports the 'f' and 't' constraints, but
1213 not 'u'.</li>
1214
Dan Gohman8207ba92008-06-08 23:05:11 +0000[diff] [blame]1215 <li>The X86-64 backend does not yet support the LLVM IR instruction
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1216 <tt>va_arg</tt>. Currently, front-ends support variadic argument
1217 constructs on X86-64 by lowering them manually.</li>
1218
NAKAMURA Takumi45c435a2011-04-05 08:24:22 +0000[diff] [blame]1219 <li>Windows x64 (aka Win64) code generator has a few issues.
1220 <ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1221 <li>llvm-gcc cannot build the mingw-w64 runtime currently due to lack of
1222 support for the 'u' inline assembly constraint and for X87 floating
1223 point inline assembly.</li>
1224
1225 <li>On mingw-w64, you will see unresolved symbol <tt>__chkstk</tt> due
1226 to <a href="http://llvm.org/bugs/show_bug.cgi?id=8919">Bug 8919</a>.
1227 It is fixed
1228 in <a href="http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20110321/118499.html">r128206</a>.</li>
1229
NAKAMURA Takumi45c435a2011-04-05 08:24:22 +0000[diff] [blame]1230 <li>Miss-aligned MOVDQA might crash your program. It is due to
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1231 <a href="http://llvm.org/bugs/show_bug.cgi?id=9483">Bug 9483</a>, lack
1232 of handling aligned internal globals.</li>
NAKAMURA Takumi45c435a2011-04-05 08:24:22 +0000[diff] [blame]1233 </ul>
1234 </li>
1235
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1236</ul>
1237
1238</div>
1239
1240<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1241<h3>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1242 <a name="ppc-be">Known problems with the PowerPC back-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1243</h3>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1244
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1245<div>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1246
1247<ul>
Roman Divacky223764c2011-10-30 07:49:04 +0000[diff] [blame]1248 <li>The PPC32/ELF support lacks PIC support.</li>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1249</ul>
1250
1251</div>
1252
1253<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1254<h3>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]1255 <a name="arm-be">Known problems with the ARM back-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1256</h3>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]1257
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1258<div>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]1259
1260<ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1261 <li>Thumb mode works only on ARMv6 or higher processors. On sub-ARMv6
1262 processors, thumb programs can crash or produce wrong results
1263 (<a href="http://llvm.org/PR1388">PR1388</a>).</li>
1264
1265 <li>Compilation for ARM Linux OABI (old ABI) is supported but not fully
1266 tested.</li>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]1267</ul>
1268
1269</div>
1270
1271<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1272<h3>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1273 <a name="sparc-be">Known problems with the SPARC back-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1274</h3>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1275
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1276<div>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1277
1278<ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1279 <li>The SPARC backend only supports the 32-bit SPARC ABI (-m32); it does not
1280 support the 64-bit SPARC ABI (-m64).</li>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1281</ul>
1282
1283</div>
1284
1285<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1286<h3>
Bruno Cardoso Lopesb7e1a4f2008-10-25 14:56:26 +0000[diff] [blame]1287 <a name="mips-be">Known problems with the MIPS back-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1288</h3>
Bruno Cardoso Lopesb7e1a4f2008-10-25 14:56:26 +0000[diff] [blame]1289
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1290<div>
Bruno Cardoso Lopesb7e1a4f2008-10-25 14:56:26 +0000[diff] [blame]1291
1292<ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1293 <li>64-bit MIPS targets are not supported yet.</li>
Bruno Cardoso Lopesb7e1a4f2008-10-25 14:56:26 +0000[diff] [blame]1294</ul>
1295
1296</div>
1297
1298<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1299<h3>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1300 <a name="alpha-be">Known problems with the Alpha back-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1301</h3>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1302
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1303<div>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1304
1305<ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1306 <li>On 21164s, some rare FP arithmetic sequences which may trap do not have
1307 the appropriate nops inserted to ensure restartability.</li>
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]1308</ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1309
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]1310</div>
1311
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1312<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1313<h3>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]1314 <a name="c-be">Known problems with the C back-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1315</h3>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1316
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1317<div>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1318
Chris Lattner3016ee92010-09-29 05:34:42 +0000[diff] [blame]1319<p>The C backend has numerous problems and is not being actively maintained.
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1320 Depending on it for anything serious is not advised.</p>
Chris Lattner3016ee92010-09-29 05:34:42 +0000[diff] [blame]1321
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1322<ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1323 <li><a href="http://llvm.org/PR802">The C backend has only basic support for
1324 inline assembly code</a>.</li>
1325
1326 <li><a href="http://llvm.org/PR1658">The C backend violates the ABI of common
1327 C++ programs</a>, preventing intermixing between C++ compiled by the CBE
1328 and C++ code compiled with <tt>llc</tt> or native compilers.</li>
1329
1330 <li>The C backend does not support all exception handling constructs.</li>
1331
1332 <li>The C backend does not support arbitrary precision integers.</li>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1333</ul>
1334
1335</div>
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]1336
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1337
1338<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1339<h3>
Chris Lattner3016ee92010-09-29 05:34:42 +0000[diff] [blame]1340 <a name="llvm-gcc">Known problems with the llvm-gcc front-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1341</h3>
Chris Lattner47588f92003-10-02 05:07:23 +0000[diff] [blame]1342
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1343<div>
Chris Lattnerc5d658a2006-03-03 00:34:26 +0000[diff] [blame]1344
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1345<p><b>LLVM 2.9 was the last release of llvm-gcc.</b></p>
Chris Lattner49123fd2011-04-06 06:29:50 +0000[diff] [blame]1346
Chris Lattner3016ee92010-09-29 05:34:42 +0000[diff] [blame]1347<p>llvm-gcc is generally very stable for the C family of languages. The only
1348 major language feature of GCC not supported by llvm-gcc is the
1349 <tt>__builtin_apply</tt> family of builtins. However, some extensions
1350 are only supported on some targets. For example, trampolines are only
1351 supported on some targets (these are used when you take the address of a
1352 nested function).</p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1353
Chris Lattner3016ee92010-09-29 05:34:42 +0000[diff] [blame]1354<p>Fortran support generally works, but there are still several unresolved bugs
1355 in <a href="http://llvm.org/bugs/">Bugzilla</a>. Please see the
1356 tools/gfortran component for details. Note that llvm-gcc is missing major
1357 Fortran performance work in the frontend and library that went into GCC after
1358 4.2. If you are interested in Fortran, we recommend that you consider using
1359 <a href="#dragonegg">dragonegg</a> instead.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1360
Duncan Sands3af96332010-10-04 10:06:56 +0000[diff] [blame]1361<p>The llvm-gcc 4.2 Ada compiler has basic functionality, but is no longer being
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1362 actively maintained. If you are interested in Ada, we recommend that you
1363 consider using <a href="#dragonegg">dragonegg</a> instead.</p>
1364
Chris Lattner2b659ef2008-02-12 06:29:45 +0000[diff] [blame]1365</div>
1366
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1367</div>
1368
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1369<!-- *********************************************************************** -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1370<h2>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1371 <a name="additionalinfo">Additional Information</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1372</h2>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1373<!-- *********************************************************************** -->
1374
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1375<div>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1376
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1377<p>A wide variety of additional information is available on
1378 the <a href="http://llvm.org/">LLVM web page</a>, in particular in
1379 the <a href="http://llvm.org/docs/">documentation</a> section. The web page
1380 also contains versions of the API documentation which is up-to-date with the
1381 Subversion version of the source code. You can access versions of these
1382 documents specific to this release by going into the "<tt>llvm/doc/</tt>"
1383 directory in the LLVM tree.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1384
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1385<p>If you have any questions or comments about LLVM, please feel free to contact
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1386 us via the <a href="http://llvm.org/docs/#maillist"> mailing lists</a>.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1387
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1388</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1389
1390<!-- *********************************************************************** -->
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1391
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1392<hr>
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]1393<address>
Misha Brukman38847d52003-12-21 22:53:21 +0000[diff] [blame]1394 <a href="http://jigsaw.w3.org/css-validator/check/referer"><img
Misha Brukman44408702008-12-11 17:34:48 +0000[diff] [blame]1395 src="http://jigsaw.w3.org/css-validator/images/vcss-blue" alt="Valid CSS"></a>
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]1396 <a href="http://validator.w3.org/check/referer"><img
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Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]1398
Chris Lattnerb4b0ce72007-05-18 00:44:29 +0000[diff] [blame]1399 <a href="http://llvm.org/">LLVM Compiler Infrastructure</a><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1400 Last modified: $Date$
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]1401</address>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1402
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1403</body>
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