Gitiles
Code Review Sign In
gerrit-public.fairphone.software / fp2-dev / platform / external / llvm / 1ab8ce93720c7d7aacd30615a68b22843a2043c8 / . / docs / ReleaseNotes.html
blob: d1f2cc22ff75bd7bdb1829503c9d1f5b5ed3023e [file] [log] [blame]
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
2 "http://www.w3.org/TR/html4/strict.dtd">
3<html>
4<head>
Reid Spencer6454ed32004-11-18 18:38:58 +0000[diff] [blame]5 <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]6 <link rel="stylesheet" href="llvm.css" type="text/css">
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
Chris Lattner1ab8ce92011-11-27 18:47:37 +0000[diff] [blame^]48 major improvements from the previous release, improvements in various
49 subprojects of LLVM, and some of the current users of the code.
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]50 All LLVM releases may be downloaded from
51 the <a href="http://llvm.org/releases/">LLVM releases web site</a>.</p>
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]52
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame]53<p>For more information about LLVM, including information about the latest
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]54 release, please check out the <a href="http://llvm.org/">main LLVM web
55 site</a>. If you have questions or comments,
56 the <a href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVM
57 Developer's Mailing List</a> is a good place to send them.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]58
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]59<p>Note that if you are reading this file from a Subversion checkout or the main
60 LLVM web page, this document applies to the <i>next</i> release, not the
61 current one. To see the release notes for a specific release, please see the
62 <a href="http://llvm.org/releases/">releases page</a>.</p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]63
64</div>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]65
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]66
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]67<!-- *********************************************************************** -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]68<h2>
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]69 <a name="subproj">Sub-project Status Update</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]70</h2>
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]71<!-- *********************************************************************** -->
Chris Lattnerea34f642008-06-08 21:34:41 +0000[diff] [blame]72
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]73<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]74
75<p>The LLVM 3.0 distribution currently consists of code from the core LLVM
76 repository (which roughly includes the LLVM optimizers, code generators and
Chris Lattnerc343e312011-11-10 20:15:40 +0000[diff] [blame]77 supporting tools), and the Clang repository. In
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]78 addition to this code, the LLVM Project includes other sub-projects that are
79 in development. Here we include updates on these subprojects.</p>
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]80
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]81<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]82<h3>
Chris Lattnerfb97b2d2008-10-13 18:11:54 +0000[diff] [blame]83<a name="clang">Clang: C/C++/Objective-C Frontend Toolkit</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]84</h3>
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]85
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]86<div>
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]87
Chris Lattner095539f2010-04-26 17:42:18 +0000[diff] [blame]88<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]89 C++, and Objective-C languages. Clang aims to provide a better user
90 experience through expressive diagnostics, a high level of conformance to
91 language standards, fast compilation, and low memory use. Like LLVM, Clang
92 provides a modular, library-based architecture that makes it suitable for
93 creating or integrating with other development tools. Clang is considered a
94 production-quality compiler for C, Objective-C, C++ and Objective-C++ on x86
Chris Lattner1ab8ce92011-11-27 18:47:37 +0000[diff] [blame^]95 (32- and 64-bit), and for Darwin/ARM targets.</p>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]96
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]97<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]98
99<ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]100 <li>Greatly improved support for building C++ applications, with greater
101 stability and better diagnostics.</li>
Douglas Gregorba087df2011-10-15 00:48:01 +0000[diff] [blame]102
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]103 <li><a href="http://clang.llvm.org/cxx_status.html">Improved support</a> for
104 the <a href="http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=50372">C++
Chris Lattner1ab8ce92011-11-27 18:47:37 +0000[diff] [blame^]105 2011</a> standard (aka "C++'0x"), including implementations of non-static data member
106 initializers, alias templates, delegating constructors, range-based
107 for loops, and implicitly-generated move constructors and move assignment
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]108 operators, among others.</li>
Douglas Gregorba087df2011-10-15 00:48:01 +0000[diff] [blame]109
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]110 <li>Implemented support for some features of the upcoming C1x standard,
111 including static assertions and generic selections.</li>
Douglas Gregorba087df2011-10-15 00:48:01 +0000[diff] [blame]112
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]113 <li>Better detection of include and linking paths for system headers and
114 libraries, especially for Linux distributions.</li>
Douglas Gregorba087df2011-10-15 00:48:01 +0000[diff] [blame]115
David Chisnall553284e2011-11-26 10:56:17 +0000[diff] [blame]116 <li>Several improvements to Objective-C support, including:
117
118 <ul>
119 <li><a href="http://clang.llvm.org/docs/AutomaticReferenceCounting.html">
120 Automatic Reference Counting</a> (ARC) and an improved memory model
121 cleanly separating object and C memory.</li>
122
Chris Lattner1ab8ce92011-11-27 18:47:37 +0000[diff] [blame^]123 <li>A migration tool for moving manual retain/release code to ARC</li>
David Chisnall553284e2011-11-26 10:56:17 +0000[diff] [blame]124
125 <li>Better support for data hiding, allowing instance variables to be
126 declared in implementation contexts or class extensions</li>
Chris Lattner1ab8ce92011-11-27 18:47:37 +0000[diff] [blame^]127 <li>Weak linking support for Objective-C classes</li>
David Chisnall553284e2011-11-26 10:56:17 +0000[diff] [blame]128 <li>Improved static type checking by inferring the return type of methods
129 such as +alloc and -init.</li>
130 </ul>
131
Chris Lattner1ab8ce92011-11-27 18:47:37 +0000[diff] [blame^]132 Some new Objective-C features require either the Mac OS X 10.7 / iOS 5
133 Objective-C runtime, or version 1.6 or later of the GNUstep Objective-C
134 runtime version.</li>
Douglas Gregorba087df2011-10-15 00:48:01 +0000[diff] [blame]135
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]136 <li>Implemented a number of optimizations in <tt>libclang</tt>, the Clang C
137 interface, to improve the performance of code completion and the mapping
138 from source locations to abstract syntax tree nodes.</li>
Douglas Gregorba087df2011-10-15 00:48:01 +0000[diff] [blame]139</ul>
140
Chris Lattner0a6f6d52011-04-05 07:19:28 +0000[diff] [blame]141
Duncan Sandsf3ba7af2011-04-06 08:07:40 +0000[diff] [blame]142<p>If Clang rejects your code but another compiler accepts it, please take a
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]143 look at the <a href="http://clang.llvm.org/compatibility.html">language
144 compatibility</a> guide to make sure this is not intentional or a known
145 issue.</p>
Bill Wendling741748a2008-10-27 09:27:33 +0000[diff] [blame]146
Chris Lattnerfb97b2d2008-10-13 18:11:54 +0000[diff] [blame]147</div>
148
149<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]150<h3>
Duncan Sands528a5102011-04-04 11:09:08 +0000[diff] [blame]151<a name="dragonegg">DragonEgg: GCC front-ends, LLVM back-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]152</h3>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]153
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]154<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]155<p><a href="http://dragonegg.llvm.org/">DragonEgg</a> is a
156 <a href="http://gcc.gnu.org/wiki/plugins">gcc plugin</a> that replaces GCC's
Duncan Sands77352c92011-11-10 18:44:29 +0000[diff] [blame]157 optimizers and code generators with LLVM's. It works with gcc-4.5 or gcc-4.6,
158 targets the x86-32 and x86-64 processor families, and has been successfully
159 used on the Darwin, FreeBSD, KFreeBSD, Linux and OpenBSD platforms. It fully
160 supports Ada, C, C++ and Fortran. It has partial support for Go, Java, Obj-C
161 and Obj-C++.</p>
Duncan Sands749fd832010-04-02 09:23:15 +0000[diff] [blame]162
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]163<p>The 3.0 release has the following notable changes:</p>
164
Chris Lattner1ab8ce92011-11-27 18:47:37 +0000[diff] [blame^]165 <ul>
Duncan Sands77352c92011-11-10 18:44:29 +0000[diff] [blame]166 <li>GCC version 4.6 is now fully supported.</li>
167
168 <li>Patching and building GCC is no longer required: the plugin should work
169 with your system GCC (version 4.5 or 4.6; on Debian/Ubuntu systems the
170 gcc-4.5-plugin-dev or gcc-4.6-plugin-dev package is also needed).</li>
171
172 <li>The <tt>-fplugin-arg-dragonegg-enable-gcc-optzns</tt> option, which runs
173 GCC's optimizers as well as LLVM's, now works much better. This is the
Chris Lattner1ab8ce92011-11-27 18:47:37 +0000[diff] [blame^]174 option to use if you want ultimate performance! It is still experimental
175 though: it may cause the plugin to crash.</li>
Duncan Sands77352c92011-11-10 18:44:29 +0000[diff] [blame]176
177 <li>The type and constant conversion logic has been almost entirely rewritten,
178 fixing a multitude of obscure bugs.</li>
179
Duncan Sands4b1da2b2010-09-30 17:37:34 +0000[diff] [blame]180</ul>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]181
182</div>
183
Chris Lattner75547712010-10-03 23:49:06 +0000[diff] [blame]184<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]185<h3>
Chris Lattner75547712010-10-03 23:49:06 +0000[diff] [blame]186<a name="compiler-rt">compiler-rt: Compiler Runtime Library</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]187</h3>
Chris Lattner75547712010-10-03 23:49:06 +0000[diff] [blame]188
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]189<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]190
191<p>The new LLVM <a href="http://compiler-rt.llvm.org/">compiler-rt project</a>
192 is a simple library that provides an implementation of the low-level
193 target-specific hooks required by code generation and other runtime
194 components. For example, when compiling for a 32-bit target, converting a
195 double to a 64-bit unsigned integer is compiled into a runtime call to the
196 "__fixunsdfdi" function. The compiler-rt library provides highly optimized
197 implementations of this and other low-level routines (some are 3x faster than
198 the equivalent libgcc routines).</p>
Chris Lattner75547712010-10-03 23:49:06 +0000[diff] [blame]199
Chris Lattner1ab8ce92011-11-27 18:47:37 +0000[diff] [blame^]200<p>In the LLVM 3.0 timeframe, the target specific ARM code has converted to
201 "unified" assembly syntax, and several new functions have been added to the
202 library.</p>
Chris Lattner75547712010-10-03 23:49:06 +0000[diff] [blame]203
204</div>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]205
206<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]207<h3>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]208<a name="lldb">LLDB: Low Level Debugger</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]209</h3>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]210
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]211<div>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]212
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]213<p>LLDB has advanced by leaps and bounds in the 3.0 timeframe. It is
214 dramatically more stable and useful, and includes both a
215 new <a href="http://lldb.llvm.org/tutorial.html">tutorial</a> and
216 a <a href="http://lldb.llvm.org/lldb-gdb.html">side-by-side comparison with
217 GDB</a>.</p>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]218
219</div>
220
221<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]222<h3>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]223<a name="libc++">libc++: C++ Standard Library</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]224</h3>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]225
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]226<div>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]227
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]228<p>Like compiler_rt, libc++ is now <a href="DeveloperPolicy.html#license">dual
229 licensed</a> under the MIT and UIUC license, allowing it to be used more
230 permissively.</p>
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]231
David Chisnall553284e2011-11-26 10:56:17 +0000[diff] [blame]232<p>Libc++ has been ported to FreeBSD and imported into the base system. It is
233 planned to be the default STL implementation for FreeBSD 10.</p>
234
Chris Lattnere07043c2010-09-29 05:30:03 +0000[diff] [blame]235</div>
236
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]237
Chris Lattner3d6a80a2011-04-07 03:08:22 +0000[diff] [blame]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="LLBrowse">LLBrowse: IR Browser</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]241</h3>
Daniel Dunbar97b01a82010-10-04 17:39:47 +0000[diff] [blame]242
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]243<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]244
245<p><a href="http://llvm.org/svn/llvm-project/llbrowse/trunk/doc/LLBrowse.html">
246 LLBrowse</a> is an interactive viewer for LLVM modules. It can load any LLVM
247 module and displays its contents as an expandable tree view, facilitating an
248 easy way to inspect types, functions, global variables, or metadata nodes. It
249 is fully cross-platform, being based on the popular wxWidgets GUI
250 toolkit.</p>
251
Chris Lattner3d6a80a2011-04-07 03:08:22 +0000[diff] [blame]252</div>
253
254<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]255<h3>
Chris Lattner3d6a80a2011-04-07 03:08:22 +0000[diff] [blame]256<a name="vmkit">VMKit</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]257</h3>
Chris Lattner3d6a80a2011-04-07 03:08:22 +0000[diff] [blame]258
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]259<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]260
Nicolas Geoffray54d5df92011-11-10 23:37:56 +0000[diff] [blame]261 <p>The <a href="http://vmkit.llvm.org/">VMKit project</a> is an
262 implementation of a Java Virtual Machine (Java VM or JVM) that uses LLVM for
263 static and just-in-time compilation.
264
265 <p>In the LLVM 3.0 time-frame, VMKit has had significant improvements on both
266 runtime and startup performance:</p>
267
268 <ul>
269 <li>Precompilation: by compiling ahead of time a small subset of Java's core
270 library, the startup performance have been highly optimized to the point that
271 running a 'Hello World' program takes less than 30 milliseconds.</li>
272
273 <li>Customization: by customizing virtual methods for individual classes,
274 the VM can statically determine the target of a virtual call, and decide to
275 inline it.</li>
276
277 <li>Inlining: the VM does more inlining than it did before, by allowing more
278 bytecode instructions to be inlined, and thanks to customization. It also
279 inlines GC barriers, and object allocations.</li>
280
281 <li>New exception model: the generated code for a method that does not do
282 any try/catch is not penalized anymore by the eventuality of calling a
283 method that throws an exception. Instead, the method that throws the
284 exception jumps directly to the method that could catch it.</li>
285 </ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]286
Chris Lattner3d6a80a2011-04-07 03:08:22 +0000[diff] [blame]287</div>
288
289
Daniel Dunbar97b01a82010-10-04 17:39:47 +0000[diff] [blame]290<!--=========================================================================-->
Chris Lattner7a8e6c52011-04-05 18:38:45 +0000[diff] [blame]291<!--
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]292<h3>
Daniel Dunbar97b01a82010-10-04 17:39:47 +0000[diff] [blame]293<a name="klee">KLEE: A Symbolic Execution Virtual Machine</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]294</h3>
Daniel Dunbar97b01a82010-10-04 17:39:47 +0000[diff] [blame]295
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]296<div>
Daniel Dunbar97b01a82010-10-04 17:39:47 +0000[diff] [blame]297<p>
298<a href="http://klee.llvm.org/">KLEE</a> is a symbolic execution framework for
299programs in LLVM bitcode form. KLEE tries to symbolically evaluate "all" paths
300through the application and records state transitions that lead to fault
301states. This allows it to construct testcases that lead to faults and can even
302be used to verify some algorithms.
303</p>
304
Chris Lattnerbe2e1b52011-03-10 07:43:44 +0000[diff] [blame]305<p>UPDATE!</p>
Chris Lattner7a8e6c52011-04-05 18:38:45 +0000[diff] [blame]306</div>-->
Daniel Dunbar97b01a82010-10-04 17:39:47 +0000[diff] [blame]307
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]308</div>
Daniel Dunbar97b01a82010-10-04 17:39:47 +0000[diff] [blame]309
Chris Lattnerab68e9e2009-02-26 22:33:38 +0000[diff] [blame]310<!-- *********************************************************************** -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]311<h2>
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]312 <a name="externalproj">External Open Source Projects Using LLVM 3.0</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]313</h2>
Chris Lattnerab68e9e2009-02-26 22:33:38 +0000[diff] [blame]314<!-- *********************************************************************** -->
315
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]316<div>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]317
318<p>An exciting aspect of LLVM is that it is used as an enabling technology for
319 a lot of other language and tools projects. This section lists some of the
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]320 projects that have already been updated to work with LLVM 3.0.</p>
Chris Lattner75547712010-10-03 23:49:06 +0000[diff] [blame]321
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]322<!--=========================================================================-->
Bill Wendling7be6bc52011-10-26 00:17:54 +0000[diff] [blame]323<h3>AddressSanitizer</h3>
324
325<div>
326
327<p><a href="http://code.google.com/p/address-sanitizer/">AddressSanitizer</a>
328 uses compiler instrumentation and a specialized malloc library to find C/C++
329 bugs such as use-after-free and out-of-bound accesses to heap, stack, and
330 globals. The key feature of the tool is speed: the average slowdown
331 introduced by AddressSanitizer is less than 2x.</p>
332
333</div>
334
335<!--=========================================================================-->
Bill Wendling29817ea2011-10-26 00:14:36 +0000[diff] [blame]336<h3>ClamAV</h3>
337
338<div>
Bill Wendlingf2a78332011-10-25 01:01:42 +0000[diff] [blame]339
Bill Wendling29817ea2011-10-26 00:14:36 +0000[diff] [blame]340<p><a href="http://www.clamav.net">Clam AntiVirus</a> is an open source (GPL)
341 anti-virus toolkit for UNIX, designed especially for e-mail scanning on mail
342 gateways.</p>
343
344<p>Since version 0.96 it
345 has <a href="http://vrt-sourcefire.blogspot.com/2010/09/introduction-to-clamavs-low-level.html">bytecode
346 signatures</a> that allow writing detections for complex malware.</p>
347
348<p>It uses LLVM's JIT to speed up the execution of bytecode on X86, X86-64,
349 PPC32/64, falling back to its own interpreter otherwise. The git version was
350 updated to work with LLVM 3.0.</p>
351
352</div>
353
354<!--=========================================================================-->
Tobias Grosserae5a6fd2011-11-14 09:09:26 +0000[diff] [blame]355<h3>clang_complete for VIM</h3>
356
357<div>
358
359<p><a href="https://github.com/Rip-Rip/clang_complete">clang_complete</a> is a
360 VIM plugin, that provides accurate C/C++ autocompletion using the clang front
361 end. The development version of clang complete, can directly use libclang
362 which can maintain a cache to speed up auto completion.</p>
363
364</div>
365
366<!--=========================================================================-->
Bill Wendling65d1f412011-10-26 18:23:06 +0000[diff] [blame]367<h3>clReflect</h3>
368
369<div>
370
371<p><a href="https://bitbucket.org/dwilliamson/clreflect">clReflect</a> is a C++
372 parser that uses clang/LLVM to derive a light-weight reflection database
373 suitable for use in game development. It comes with a very simple runtime
374 library for loading and querying the database, requiring no external
375 dependencies (including CRT), and an additional utility library for object
376 management and serialisation.</p>
377
378</div>
379
380<!--=========================================================================-->
Bill Wendling63507d12011-10-29 01:10:01 +0000[diff] [blame]381<h3>Cling C++ Interpreter</h3>
382
383<div>
384
385<p><a href="http://cern.ch/cling">Cling</a> is an interactive compiler interface
386 (aka C++ interpreter). It uses LLVM's JIT and clang; it currently supports
387 C++ and C. It has a prompt interface, runs source files, calls into shared
388 libraries, prints the value of expressions, even does runtime lookup of
389 identifiers (dynamic scopes). And it just behaves like one would expect from
390 an interpreter.</p>
391
392</div>
393
394<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]395<h3>Crack Programming Language</h3>
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]396
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]397<div>
Bill Wendling55d6e672011-11-03 20:10:01 +0000[diff] [blame]398
399<p><a href="http://code.google.com/p/crack-language/">Crack</a> aims to provide
400 the ease of development of a scripting language with the performance of a
401 compiled language. The language derives concepts from C++, Java and Python,
402 incorporating object-oriented programming, operator overloading and strong
403 typing.</p>
404
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]405</div>
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]406
407<!--=========================================================================-->
Bill Wendlingb99486f2011-11-08 05:22:54 +0000[diff] [blame]408<h3>Eero</h3>
409
410<div>
411
412<p><a href="http://eerolanguage.org/">Eero</a> is a fully
413 header-and-binary-compatible dialect of Objective-C 2.0, implemented with a
414 patched version of the Clang/LLVM compiler. It features a streamlined syntax,
415 Python-like indentation, and new operators, for improved readability and
416 reduced code clutter. It also has new features such as limited forms of
417 operator overloading and namespaces, and strict (type-and-operator-safe)
418 enumerations. It is inspired by languages such as Smalltalk, Python, and
419 Ruby.</p>
420
421</div>
422
423<!--=========================================================================-->
Chris Lattneradb417a2011-11-25 20:28:16 +0000[diff] [blame]424<h3>FAUST Real-Time Audio Signal Processing Language</h3>
425
426<div>
427
428<p><a href="http://faust.grame.fr/">FAUST</a> is a compiled language for
429 real-time audio signal processing. The name FAUST stands for Functional
430 AUdio STream. Its programming model combines two approaches: functional
431 programming and block diagram composition. In addition with the C, C++, Java
432 output formats, the Faust compiler can now generate LLVM bitcode, and works
433 with LLVM 2.7-3.0.
434 </p>
435
436</div>
437
438<!--=========================================================================-->
Bill Wendlingf9778192011-10-26 00:09:55 +0000[diff] [blame]439<h3>Glasgow Haskell Compiler (GHC)</h3>
440
441<div>
442
443<p>GHC is an open source, state-of-the-art programming suite for Haskell, a
444 standard lazy functional programming language. It includes an optimizing
445 static compiler generating good code for a variety of platforms, together
446 with an interactive system for convenient, quick development.</p>
447
448<p>GHC 7.0 and onwards include an LLVM code generator, supporting LLVM 2.8 and
449 later. Since LLVM 2.9, GHC now includes experimental support for the ARM
450 platform with LLVM 3.0.</p>
451
452</div>
453
454<!--=========================================================================-->
Bill Wendlingf62333d2011-10-25 20:35:31 +0000[diff] [blame]455<h3>gwXscript</h3>
456
457<div>
458
459<p><a href="http://botwars.tk/gwscript/">gwXscript</a> is an object oriented,
Bill Wendling7c38de22011-10-26 04:24:15 +0000[diff] [blame]460 aspect oriented programming language which can create both executables (ELF,
Bill Wendlingf62333d2011-10-25 20:35:31 +0000[diff] [blame]461 EXE) and shared libraries (DLL, SO, DYNLIB). The compiler is implemented in
462 its own language and translates scripts into LLVM-IR which can be optimized
463 and translated into native code by the LLVM framework. Source code in
464 gwScript contains definitions that expand the namespaces. So you can build
465 your project and simply 'plug out' features by removing a file. The remaining
466 project does not leave scars since you directly separate concerns by the
467 'template' feature of gwX. It is also possible to add new features to a
468 project by just adding files and without editing the original project. This
469 language is used for example to create games or content management systems
470 that should be extendable.</p>
471
472<p>gwXscript is strongly typed and offers comfort with its native types string,
473 hash and array. You can easily write new libraries in gwXscript or native
474 code. gwXscript is type safe and users should not be able to crash your
475 program or execute malicious code except code that is eating CPU time.</p>
476
477</div>
478
479<!--=========================================================================-->
Bill Wendling50cacc82011-10-26 22:55:18 +0000[diff] [blame]480<h3>include-what-you-use</h3>
481
482<div>
483
484<p><a href="http://code.google.com/p/include-what-you-use">include-what-you-use</a>
485 is a tool to ensure that a file directly <code>#include</code>s
486 all <code>.h</code> files that provide a symbol that the file uses. It also
487 removes superfluous <code>#include</code>s from source files.</p>
488
489</div>
490
491<!--=========================================================================-->
Bill Wendling32dc4d92011-11-07 22:05:17 +0000[diff] [blame]492<h3>ispc: The Intel SPMD Program Compiler</h3>
493
494<div>
495
496<p><a href="http://ispc.github.com">ispc</a> is a compiler for "single program,
497 multiple data" (SPMD) programs. It compiles a C-based SPMD programming
498 language to run on the SIMD units of CPUs; it often delivers 5-6x speedups on
499 a single core of a CPU with an 8-wide SIMD unit compared to serial code,
500 while still providing a clean and easy-to-understand programming model. For
501 an introduction to the language and its performance,
Chris Lattnerc343e312011-11-10 20:15:40 +0000[diff] [blame]502 see <a href="http://ispc.github.com/example.html">the walkthrough</a> of a short
Bill Wendling32dc4d92011-11-07 22:05:17 +0000[diff] [blame]503 example program. ispc is licensed under the BSD license.</p>
504
505</div>
Chris Lattnercc089772011-11-25 20:36:17 +0000[diff] [blame]506
507<!--=========================================================================-->
508<h3>The Julia Programming Language</h3>
509
510<div>
511
512<p><a href="http://github.com/JuliaLang/julia">Julia</a> is a high-level,
513 high-performance dynamic language for technical
514 computing. It provides a sophisticated compiler, distributed parallel
515 execution, numerical accuracy, and an extensive mathematical function
516 library. The compiler uses type inference to generate fast code
517 without any type declarations, and uses LLVM's optimization passes and
518 JIT compiler. The language is designed around multiple dispatch,
519 giving programs a large degree of flexibility. It is ready for use on many
520 kinds of problems.</p>
521</div>
Bill Wendling32dc4d92011-11-07 22:05:17 +0000[diff] [blame]522
523<!--=========================================================================-->
Bill Wendling57fd8762011-10-26 18:20:54 +0000[diff] [blame]524<h3>LanguageKit and Pragmatic Smalltalk</h3>
525
526<div>
527
528<p><a href="http://etoileos.com/etoile/features/languagekit/">LanguageKit</a> is
529 a framework for implementing dynamic languages sharing an object model with
530 Objective-C. It provides static and JIT compilation using LLVM along with
531 its own interpreter. Pragmatic Smalltalk is a dialect of Smalltalk, built on
532 top of LanguageKit, that interfaces directly with Objective-C, sharing the
533 same object representation and message sending behaviour. These projects are
Benjamin Kramer7c5025b2011-11-25 21:26:00 +0000[diff] [blame]534 developed as part of the &Eacute;toil&eacute; desktop environment.</p>
Bill Wendling57fd8762011-10-26 18:20:54 +0000[diff] [blame]535
536</div>
537
538<!--=========================================================================-->
Bill Wendling03250532011-11-01 04:08:23 +0000[diff] [blame]539<h3>LuaAV</h3>
540
541<div>
542
543<p><a href="http://lua-av.mat.ucsb.edu/blog/">LuaAV</a> is a real-time
544 audiovisual scripting environment based around the Lua language and a
545 collection of libraries for sound, graphics, and other media protocols. LuaAV
546 uses LLVM and Clang to JIT compile efficient user-defined audio synthesis
547 routines specified in a declarative syntax.</p>
548
549</div>
550
551<!--=========================================================================-->
Bill Wendlingd4821b82011-10-26 00:16:17 +0000[diff] [blame]552<h3>Mono</h3>
553
554<div>
555
556<p>An open source, cross-platform implementation of C# and the CLR that is
557 binary compatible with Microsoft.NET. Has an optional, dynamically-loaded
558 LLVM code generation backend in Mini, the JIT compiler.</p>
559
560<p>Note that we use a Git mirror of LLVM with some patches. See:
561 https://github.com/mono/llvm</p>
562
563</div>
564
565<!--=========================================================================-->
Tobias Grosser093cb7e2011-11-14 09:09:23 +0000[diff] [blame]566<h3>Polly</h3>
567
568<div>
569
570<p><a href="http://polly.grosser.es">Polly</a> is an advanced data-locality
571 optimizer and automatic parallelizer. It uses an advanced, mathematical
572 model to calculate detailed data dependency information which it uses to
573 optimize the loop structure of a program. Polly can speed up sequential code
574 by improving memory locality and consequently the cache use. Furthermore,
575 Polly is able to expose different kind of parallelism which it exploits by
576 introducing (basic) OpenMP and SIMD code. A mid-term goal of Polly is to
577 automatically create optimized GPU code.</p>
578
579</div>
580
581<!--=========================================================================-->
Bill Wendlingba226272011-10-25 20:37:45 +0000[diff] [blame]582<h3>Portable OpenCL (pocl)</h3>
583
584<div>
585
586<p>Portable OpenCL is an open source implementation of the OpenCL standard which
587 can be easily adapted for new targets. One of the goals of the project is
588 improving performance portability of OpenCL programs, avoiding the need for
589 target-dependent manual optimizations. A "native" target is included, which
590 allows running OpenCL kernels on the host (CPU).</p>
591
592</div>
593
594<!--=========================================================================-->
Bill Wendling0bad98c2011-10-25 20:39:06 +0000[diff] [blame]595<h3>Pure</h3>
596
597<div>
598<p><a href="http://pure-lang.googlecode.com/">Pure</a> is an
599 algebraic/functional programming language based on term rewriting. Programs
600 are collections of equations which are used to evaluate expressions in a
601 symbolic fashion. The interpreter uses LLVM as a backend to JIT-compile Pure
602 programs to fast native code. Pure offers dynamic typing, eager and lazy
603 evaluation, lexical closures, a hygienic macro system (also based on term
604 rewriting), built-in list and matrix support (including list and matrix
605 comprehensions) and an easy-to-use interface to C and other programming
606 languages (including the ability to load LLVM bitcode modules, and inline C,
607 C++, Fortran and Faust code in Pure programs if the corresponding LLVM-enabled
608 compilers are installed).</p>
609
610<p>Pure version 0.48 has been tested and is known to work with LLVM 3.0
611 (and continues to work with older LLVM releases &gt;= 2.5).</p>
612
613</div>
614
615<!--=========================================================================-->
Bill Wendling537d85b2011-10-26 00:12:04 +0000[diff] [blame]616<h3>Renderscript</h3>
617
618<div>
619
620<p><a href="http://developer.android.com/guide/topics/renderscript/index.html">Renderscript</a>
621 is Android's advanced 3D graphics rendering and compute API. It provides a
622 portable C99-based language with extensions to facilitate common use cases
623 for enhancing graphics and thread level parallelism. The Renderscript
624 compiler frontend is based on Clang/LLVM. It emits a portable bitcode format
625 for the actual compiled script code, as well as reflects a Java interface for
626 developers to control the execution of the compiled bitcode. Executable
627 machine code is then generated from this bitcode by an LLVM backend on the
628 device. Renderscript is thus able to provide a mechanism by which Android
629 developers can improve performance of their applications while retaining
630 portability.</p>
631
632</div>
633
634<!--=========================================================================-->
Bill Wendling7d5b6212011-10-25 20:40:26 +0000[diff] [blame]635<h3>SAFECode</h3>
636
637<div>
638
639<p><a href="http://safecode.cs.illinois.edu">SAFECode</a> is a memory safe C/C++
640 compiler built using LLVM. It takes standard, unannotated C/C++ code,
641 analyzes the code to ensure that memory accesses and array indexing
642 operations are safe, and instruments the code with run-time checks when
643 safety cannot be proven statically. SAFECode can be used as a debugging aid
644 (like Valgrind) to find and repair memory safety bugs. It can also be used
645 to protect code from security attacks at run-time.</p>
646
647</div>
648
649<!--=========================================================================-->
Bill Wendling02b77b72011-10-26 07:38:19 +0000[diff] [blame]650<h3>The Stupid D Compiler (SDC)</h3>
651
652<div>
653
654<p><a href="https://github.com/bhelyer/SDC">The Stupid D Compiler</a> is a
655 project seeking to write a self-hosting compiler for the D programming
656 language without using the frontend of the reference compiler (DMD).</p>
657
658</div>
659
660<!--=========================================================================-->
Bill Wendling2d7b4af2011-10-25 20:24:32 +0000[diff] [blame]661<h3>TTA-based Co-design Environment (TCE)</h3>
662
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]663<div>
Bill Wendling2d7b4af2011-10-25 20:24:32 +0000[diff] [blame]664
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]665<p>TCE is a toolset for designing application-specific processors (ASP) based on
Bill Wendling2d7b4af2011-10-25 20:24:32 +0000[diff] [blame]666 the Transport triggered architecture (TTA). The toolset provides a complete
667 co-design flow from C/C++ programs down to synthesizable VHDL and parallel
668 program binaries. Processor customization points include the register files,
669 function units, supported operations, and the interconnection network.</p>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]670
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]671<p>TCE uses Clang and LLVM for C/C++ language support, target independent
Bill Wendling2d7b4af2011-10-25 20:24:32 +0000[diff] [blame]672 optimizations and also for parts of code generation. It generates new
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]673 LLVM-based code generators "on the fly" for the designed TTA processors and
674 loads them in to the compiler backend as runtime libraries to avoid
Bill Wendling2d7b4af2011-10-25 20:24:32 +0000[diff] [blame]675 per-target recompilation of larger parts of the compiler chain.</p>
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]676
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]677</div>
Chris Lattner3bfe57e2011-04-06 01:13:49 +0000[diff] [blame]678
679<!--=========================================================================-->
Bill Wendling628c2662011-10-25 20:27:37 +0000[diff] [blame]680<h3>Tart Programming Language</h3>
681
682<div>
683
684<p><a href="http://code.google.com/p/tart/">Tart</a> is a general-purpose,
685 strongly typed programming language designed for application
686 developers. Strongly inspired by Python and C#, Tart focuses on practical
687 solutions for the professional software developer, while avoiding the clutter
688 and boilerplate of legacy languages like Java and C++. Although Tart is still
689 in development, the current implementation supports many features expected of
690 a modern programming language, such as garbage collection, powerful
691 bidirectional type inference, a greatly simplified syntax for template
692 metaprogramming, closures and function literals, reflection, operator
693 overloading, explicit mutability and immutability, and much more. Tart is
694 flexible enough to accommodate a broad range of programming styles and
695 philosophies, while maintaining a strong commitment to simplicity, minimalism
696 and elegance in design.</p>
697
698</div>
699
700<!--=========================================================================-->
Bill Wendling644ce532011-10-26 09:25:01 +0000[diff] [blame]701<h3>ThreadSanitizer</h3>
702
703<div>
704
705<p><a href="http://code.google.com/p/data-race-test/">ThreadSanitizer</a> is a
706 data race detector for (mostly) C and C++ code, available for Linux, Mac OS
707 and Windows. On different systems, we use binary instrumentation frameworks
Bill Wendlingae8538e2011-10-29 01:11:15 +0000[diff] [blame]708 (Valgrind and Pin) as frontends that generate the program events for the race
709 detection algorithm. On Linux, there's an option of using LLVM-based
710 compile-time instrumentation.</p>
Bill Wendling644ce532011-10-26 09:25:01 +0000[diff] [blame]711
712</div>
713
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]714</div>
715
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]716<!-- *********************************************************************** -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]717<h2>
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]718 <a name="whatsnew">What's New in LLVM 3.0?</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]719</h2>
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]720<!-- *********************************************************************** -->
721
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]722<div>
Chris Lattnerf8e0b4e2008-06-08 22:59:35 +0000[diff] [blame]723
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]724<p>This release includes a huge number of bug fixes, performance tweaks and
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]725 minor improvements. Some of the major improvements and new features are
726 listed in this section.</p>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]727
Chris Lattner914ce462010-04-22 06:28:20 +0000[diff] [blame]728<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]729<h3>
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]730<a name="majorfeatures">Major New Features</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]731</h3>
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]732
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]733<div>
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]734
Chris Lattner1ab8ce92011-11-27 18:47:37 +0000[diff] [blame^]735 <!-- Features that need text if they're finished for 3.1:
736 ARM EHABI
737 combiner-aa?
738 strong phi elim
739 loop dependence analysis
740 CorrelatedValuePropagation
741 lib/Transforms/IPO/MergeFunctions.cpp => consider for 3.1.
742 -->
743
Chris Lattner5a1731d2011-11-27 08:32:32 +0000[diff] [blame]744<p><b>llvm-gcc is gone</b>. LLVM's configure script doesn't depend on llvm-gcc anymore, clean layering.</p>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]745
Chris Lattnerc343e312011-11-10 20:15:40 +0000[diff] [blame]746<p>LLVM 3.0 includes several major new capabilities:</p>
747
Chris Lattnerdec23b62011-11-15 22:13:27 +0000[diff] [blame]748<!-- Near dead:
749 Analysis/RegionInfo.h + Dom Frontiers
750 SparseBitVector: used in LiveVar.
Chris Lattner5a1731d2011-11-27 08:32:32 +0000[diff] [blame]751 llvm/lib/Archive - replace with lib object?
Chris Lattnerdec23b62011-11-15 22:13:27 +0000[diff] [blame]752 -->
753
754<!--
Chris Lattner5130d4e2011-11-27 05:47:57 +0000[diff] [blame]755 Type system rewrite: http://blog.llvm.org/2011/11/llvm-30-type-system-rewrite.html
Chris Lattnerdec23b62011-11-15 22:13:27 +0000[diff] [blame]756 Better performance for Neon code in clang due to SRoA improvements.
757 New regalloc on by default. Lin scan going away in 3.1
758 PGO / builtin_expect improvements (summary needed)
759 Big EH rewrite.
760 AVX support, assembler, compiler and disassembler.
761 IndVar improvements: andy
762 PTX backend improvements: Justin
763 llvm-rtdyld & MC JIT: JimG
764 InstAliases now automatically used in the asmprinter where they are shorter.
765 Integrated assembler on by default for arm/thumb?
766 PostOrder Dominator frontiers were removed.
767 Line Profiling / gcov support
768 EH and debug information produced with CFI directives, yielding smaller executables: http://blog.mozilla.com/respindola/2011/05/12/cfi-directives/
769 X86-64 generates smaller and faster code at -O0 (fast isel improvements)
770 Better code generation for Cortex-A9
771 Many APIs take ArrayRef's now.
772 Pass manager extension API.
Chris Lattner5130d4e2011-11-27 05:47:57 +0000[diff] [blame]773 ARM inline asm constraints implemented.
774 LangRef.html#fnattrs uwtable attribute for asynch unwind tables.
775 better performance for indirect gotos.
776 llvm.prefetch now takes a 4th argument that specifies whether the prefetch happens to the icache or dcache.
777 New PackedVector, TinyPtrVector class (see Programmer's Manual)
778 New nonlazybind function attribute.
779 ARC language specific optimizer (Transforms/ObjCARC) a decent example of language-specific transformation.
Chris Lattnerfbe910e2011-11-27 06:56:53 +0000[diff] [blame]780 LLVM 3.0 removes support for reading LLVM 2.8 and earlier files. Aim to maintain compatibility all the way back to 3.0 "forever".
Chris Lattner6a007d12011-11-25 20:33:27 +0000[diff] [blame]781
Chris Lattner5130d4e2011-11-27 05:47:57 +0000[diff] [blame]782 New llvm.expect intrinsic.
783 Table generated MC expansion logic for pseudo instructions that expand to multiple MC instructions through the PseudoInstExpansion class. (JimG)
784 New llvm.fma intrinsic.
785
786 Euro dev meeting and main one too.
Chris Lattnerf51572a2011-11-27 07:37:53 +0000[diff] [blame]787 New atomics instructions, "#i_fence" instruction, cmpxchg, atomicrmw too. What target support (X86/ARM)? Also 'atomic load/store'. See Atomics.html
Chris Lattner5130d4e2011-11-27 05:47:57 +0000[diff] [blame]788 X86: inline assembler supports .code32 and .code64.
Chris Lattner8ddff912011-11-27 06:24:49 +0000[diff] [blame]789 Exception handling rewrite: new landingpad and resume instruction. Unwind gone.
790 LowerSetJmp pass removed, unused.
Chris Lattner5a1731d2011-11-27 08:32:32 +0000[diff] [blame]791 llvm-objdump / dwarf parser library / llvm-dwarfdump (d0k)
792 object file parsing stuff and llvm-size (mspencer)
793 llvm-cov (devang)
Chris Lattner8ddff912011-11-27 06:24:49 +0000[diff] [blame]794 Old arm disassembler replaced with a new one based on autogenerated encoding information from ARM .td files.
Chris Lattnerf51572a2011-11-27 07:37:53 +0000[diff] [blame]795 Frontend tests removed from llvm/test/Frontend* (was this completed for 3.0?)
796 Segmented stack support (X86 only?) Rafael and Sanjoy Das: docs/SegmentedStacks.html should be in CodeGen.html status table?
797 X86 backend support for NaCl (David Meyer / Nick L)
798 Codegen now supports vector "select" operations on vector comparisons, turning
799 them into various optimized code sequences (e.g. using the SSE4/AVX "blend"
800 instructions).
Chris Lattner5a1731d2011-11-27 08:32:32 +0000[diff] [blame]801 #line directives in integrated assembler
802 SSE domain fixing code enabled for AVX (Bruno/Jakob). Domain fixing pass is
803 now target independent (ExecutionDepsFix pass). (Jakob)
804 X86 backend synthesizes horizontal add/sub instructions from generic code.
805 returns_twice attribute (rafael)
806 Tablegen has been split into a library, clang tblgen pieces now live in clang.
807 The llvm version is now named llvm-tblgen instead of tblgen.
808 X86: Tons of encoding improvements and new instructions (e.g. Atom, Ivy Bridge,
809 and BMI instructions)
810 added to assembler and disassembler (Craig Topper)
811 data layout string can encode the natural alignment of the target's stack for better optimization (LangRef.html#datalayout)
Chris Lattnerdec23b62011-11-15 22:13:27 +0000[diff] [blame]812 -->
813
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]814<ul>
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]815
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]816<!--
817<li></li>
818-->
Chris Lattner7a8e6c52011-04-05 18:38:45 +0000[diff] [blame]819
Chris Lattner8170c102008-02-10 08:18:42 +0000[diff] [blame]820</ul>
Chris Lattner0a6f6d52011-04-05 07:19:28 +0000[diff] [blame]821
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]822</div>
823
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]824<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]825<h3>
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]826<a name="coreimprovements">LLVM IR and Core Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]827</h3>
Chris Lattnerf304ffc2008-02-10 08:17:19 +0000[diff] [blame]828
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]829<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]830
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]831<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]832 expose new optimization opportunities:</p>
Chris Lattnerf304ffc2008-02-10 08:17:19 +0000[diff] [blame]833
Bill Wendlingbc5f6dd2011-10-26 18:33:01 +0000[diff] [blame]834<p>One of the biggest changes is that 3.0 has a new exception handling
835 system. The old system used LLVM intrinsics to convey the exception handling
836 information to the code generator. It worked in most cases, but not
837 all. Inlining was especially difficult to get right. Also, the intrinsics
838 could be moved away from the <code>invoke</code> instruction, making it hard
839 to recover that information.</p>
840
841<p>The new EH system makes exception handling a first-class member of the IR. It
842 adds two new instructions:</p>
843
Chris Lattner791f77b2008-06-05 06:25:56 +0000[diff] [blame]844<ul>
Bill Wendlingbc5f6dd2011-10-26 18:33:01 +0000[diff] [blame]845 <li><a href="LangRef.html#i_landingpad"><code>landingpad</code></a> &mdash;
846 this instruction defines a landing pad basic block. It contains all of the
847 information that's needed by the code generator. It's also required to be
848 the first non-PHI instruction in the landing pad. In addition, a landing
849 pad may be jumped to only by the unwind edge of an <code>invoke</code>
850 instruction.</li>
851
852 <li><a href="LangRef.html#i_resume"><code>resume</code></a> &mdash; this
853 instruction causes the current exception to resume traveling up the
854 stack. It replaces the <code>@llvm.eh.resume</code> intrinsic.</li>
Chris Lattnerf304ffc2008-02-10 08:17:19 +0000[diff] [blame]855</ul>
Mikhail Glushenkovea65d7d2008-10-13 02:08:34 +0000[diff] [blame]856
Bill Wendlingbc5f6dd2011-10-26 18:33:01 +0000[diff] [blame]857<p>Converting from the old EH API to the new EH API is rather simple, because a
858 lot of complexity has been removed. The two intrinsics,
859 <code>@llvm.eh.exception</code> and <code>@llvm.eh.selector</code> have been
Benjamin Kramer7c5025b2011-11-25 21:26:00 +0000[diff] [blame]860 superseded by the <code>landingpad</code> instruction. Instead of generating
Bill Wendlingbc5f6dd2011-10-26 18:33:01 +0000[diff] [blame]861 a call to <code>@llvm.eh.exception</code> and <code>@llvm.eh.selector</code>:
862
863<div class="doc_code">
864<pre>
865Function *ExcIntr = Intrinsic::getDeclaration(TheModule,
866 Intrinsic::eh_exception);
867Function *SlctrIntr = Intrinsic::getDeclaration(TheModule,
868 Intrinsic::eh_selector);
869
870// The exception pointer.
871Value *ExnPtr = Builder.CreateCall(ExcIntr, "exc_ptr");
872
873std::vector&lt;Value*&gt; Args;
874Args.push_back(ExnPtr);
875Args.push_back(Builder.CreateBitCast(Personality,
876 Type::getInt8PtrTy(Context)));
877
878<i>// Add selector clauses to Args.</i>
879
880// The selector call.
881Builder.CreateCall(SlctrIntr, Args, "exc_sel");
882</pre>
883</div>
884
885<p>You should instead generate a <code>landingpad</code> instruction, that
886 returns an exception object and selector value:</p>
887
888<div class="doc_code">
889<pre>
890LandingPadInst *LPadInst =
891 Builder.CreateLandingPad(StructType::get(Int8PtrTy, Int32Ty, NULL),
892 Personality, 0);
893
894Value *LPadExn = Builder.CreateExtractValue(LPadInst, 0);
895Builder.CreateStore(LPadExn, getExceptionSlot());
896
897Value *LPadSel = Builder.CreateExtractValue(LPadInst, 1);
898Builder.CreateStore(LPadSel, getEHSelectorSlot());
899</pre>
900</div>
901
902<p>It's now trivial to add the individual clauses to the <code>landingpad</code>
903 instruction.</p>
904
905<div class="doc_code">
906<pre>
907<i><b>// Adding a catch clause</b></i>
908Constant *TypeInfo = getTypeInfo();
909LPadInst-&gt;addClause(TypeInfo);
910
911<i><b>// Adding a C++ catch-all</b></i>
912LPadInst-&gt;addClause(Constant::getNullValue(Builder.getInt8PtrTy()));
913
914<i><b>// Adding a cleanup</b></i>
915LPadInst-&gt;setCleanup(true);
916
917<i><b>// Adding a filter clause</b></i>
918std::vector&lt;Constant*&gt; TypeInfos;
919Constant *TypeInfo = getFilterTypeInfo();
920TypeInfos.push_back(Builder.CreateBitCast(TypeInfo, Builder.getInt8PtrTy()));
921
922ArrayType *FilterTy = ArrayType::get(Int8PtrTy, TypeInfos.size());
923LPadInst-&gt;addClause(ConstantArray::get(FilterTy, TypeInfos));
924</pre>
925</div>
926
927<p>Converting from using the <code>@llvm.eh.resume</code> intrinsic to
928 the <code>resume</code> instruction is trivial. It takes the exception
929 pointer and exception selector values returned by
930 the <code>landingpad</code> instruction:</p>
931
932<div class="doc_code">
933<pre>
934Type *UnwindDataTy = StructType::get(Builder.getInt8PtrTy(),
935 Builder.getInt32Ty(), NULL);
936Value *UnwindData = UndefValue::get(UnwindDataTy);
937Value *ExcPtr = Builder.CreateLoad(getExceptionObjSlot());
938Value *ExcSel = Builder.CreateLoad(getExceptionSelSlot());
939UnwindData = Builder.CreateInsertValue(UnwindData, ExcPtr, 0, "exc_ptr");
940UnwindData = Builder.CreateInsertValue(UnwindData, ExcSel, 1, "exc_sel");
941Builder.CreateResume(UnwindData);
942</pre>
943</div>
944
Chris Lattnerf304ffc2008-02-10 08:17:19 +0000[diff] [blame]945</div>
946
947<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]948<h3>
Andrew Trick5aab6382011-11-06 17:59:24 +0000[diff] [blame]949<a name="loopoptimization">Loop Optimization Improvements</a>
950</h3>
951
952<div>
953<p>The induction variable simplification pass in 3.0 only modifies
954 induction variables when profitable. Sign and zero extension
955 elimination, linear function test replacement, loop unrolling, and
956 other simplifications that require induction variable analysis have
957 been generalized so they no longer require loops to be rewritten in a
958 typically suboptimal form prior to optimization. This new design
959 preserves more IR level information, avoids undoing earlier loop
960 optimizations (particularly hand-optimized loops), and no longer
961 strongly depends on the code generator rewriting loops a second time
962 in a now optimal form--an intractable problem.</p>
963
964<p>The original behavior can be restored with -mllvm -enable-iv-rewrite;
965 however, support for this mode will be short lived. As such, bug
966 reports should be filed for any significant performance regressions
967 when moving from -mllvm -enable-iv-rewrite to the 3.0 default mode.</p>
968</div>
969
970<!--=========================================================================-->
971<h3>
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]972<a name="optimizer">Optimizer Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]973</h3>
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]974
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]975<div>
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]976
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]977<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]978 release includes a few major enhancements and additions to the
979 optimizers:</p>
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]980
981<ul>
Benjamin Kramer933a78c2011-11-26 11:14:54 +0000[diff] [blame]982<li>Information about <a href="BranchWeightMetadata.html">branch probability</a>
983 and basic block frequency is now available within LLVM, based on a
984 combination of static branch prediction heuristics and
985 <code>__builtin_expect</code> calls. That information is currently used for
986 register spill placement and if-conversion, with additional optimizations
987 planned for future releases. The same framework is intended for eventual
988 use with profile-guided optimization.</li>
Chris Lattnerc5ac61d2011-04-06 05:50:04 +0000[diff] [blame]989</li>
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]990
Chris Lattner11b66112010-10-04 02:42:39 +0000[diff] [blame]991</ul>
992
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]993</div>
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]994
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]995<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]996<h3>
Chris Lattner4ba2b652010-09-30 16:31:33 +0000[diff] [blame]997<a name="mc">MC Level Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]998</h3>
Chris Lattner4ba2b652010-09-30 16:31:33 +0000[diff] [blame]999
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1000<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1001
1002<p>The LLVM Machine Code (aka MC) subsystem was created to solve a number of
1003 problems in the realm of assembly, disassembly, object file format handling,
1004 and a number of other related areas that CPU instruction-set level tools work
1005 in.</p>
Chris Lattner7d9b6b42010-10-02 21:59:30 +0000[diff] [blame]1006
Chris Lattner7d9b6b42010-10-02 21:59:30 +0000[diff] [blame]1007<ul>
Jim Grosbach2552de02011-11-24 00:49:21 +0000[diff] [blame]1008 <li>The ELF object streamers are much more full featured.</li>
1009 <li>Target dependent relocation handling has been refactored into the Targets.</li>
1010 <li>Early stage MC-JIT infrastructure has been implemented.</li>
Chris Lattner7d9b6b42010-10-02 21:59:30 +0000[diff] [blame]1011</ul>
1012
Jim Grosbach2552de02011-11-24 00:49:21 +0000[diff] [blame]1013<p>The MC-JIT is a major new feature for MC, and will eventually grow to replace
1014the current JIT implementation. It emits object files direct to memory and
1015uses a runtime dynamic linker to resolve references and drive lazy compilation.
1016The MC-JIT enables much greater code reuse between the JIT and the static
1017compiler and provides better integration with the platform ABI as a result.</p>
1018
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1019<p>For more information, please see
1020 the <a href="http://blog.llvm.org/2010/04/intro-to-llvm-mc-project.html">Intro
1021 to the LLVM MC Project Blog Post</a>.</p>
Chris Lattner4ba2b652010-09-30 16:31:33 +0000[diff] [blame]1022
NAKAMURA Takumi45c435a2011-04-05 08:24:22 +0000[diff] [blame]1023</div>
Chris Lattner4ba2b652010-09-30 16:31:33 +0000[diff] [blame]1024
Chris Lattner4ba2b652010-09-30 16:31:33 +0000[diff] [blame]1025<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1026<h3>
Chris Lattner511433e2009-03-02 03:24:11 +0000[diff] [blame]1027<a name="codegen">Target Independent Code Generator Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1028</h3>
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]1029
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1030<div>
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]1031
Mikhail Glushenkovf795ef02009-03-01 18:09:47 +0000[diff] [blame]1032<p>We have put a significant amount of work into the code generator
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1033 infrastructure, which allows us to implement more aggressive algorithms and
1034 make it run faster:</p>
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]1035
1036<ul>
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]1037<!--
1038<li></li>
1039-->
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]1040</ul>
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]1041</div>
1042
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]1043<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1044<h3>
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]1045<a name="x86">X86-32 and X86-64 Target Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1046</h3>
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]1047
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1048<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1049
1050<p>New features and major changes in the X86 target include:</p>
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]1051
1052<ul>
Benjamin Kramer933a78c2011-11-26 11:14:54 +0000[diff] [blame]1053 <li>The X86 backend, assembler and disassembler now completely support AVX.
1054 To enable it pass <code>-mavx</code> to the compiler.</li>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1055
Chris Lattner62f009a2011-11-15 22:48:24 +0000[diff] [blame]1056 <li>The X86 backend now supports
1057 all <a href="http://llvm.org/PR879">inline assembly that uses the X86
1058 floating point stack</a>.</li>
1059
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1060 <li>The CRC32 intrinsics have been renamed. The intrinsics were previously
1061 <code>@llvm.x86.sse42.crc32.[8|16|32]</code>
1062 and <code>@llvm.x86.sse42.crc64.[8|64]</code>. They have been renamed to
1063 <code>@llvm.x86.sse42.crc32.32.[8|16|32]</code> and
1064 <code>@llvm.x86.sse42.crc32.64.[8|64]</code>.</li>
Chad Rosierf94c9c12011-05-27 20:13:10 +0000[diff] [blame]1065
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]1066</ul>
1067
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]1068</div>
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]1069
1070<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1071<h3>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]1072<a name="ARM">ARM Target Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1073</h3>
Chris Lattnerc441fb82009-03-01 02:30:21 +0000[diff] [blame]1074
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1075<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1076
1077<p>New features of the ARM target include:</p>
Chris Lattnerc441fb82009-03-01 02:30:21 +0000[diff] [blame]1078
1079<ul>
Jim Grosbach2552de02011-11-24 00:49:21 +0000[diff] [blame]1080 <li>Reworked Set Jump Long Jump EH Lowering,</li>
1081 <li>improved support for Cortex-M series processors, and</li>
1082 <li>beta quality integrated assembler support.</li>
Bob Wilsone8472772010-09-13 17:39:35 +0000[diff] [blame]1083</ul>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]1084</div>
Chris Lattner7b95c382011-11-15 22:23:46 +0000[diff] [blame]1085
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]1086
1087<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1088<h3>
Akira Hatanaka5381cbf2011-11-15 21:33:05 +0000[diff] [blame]1089<a name="MIPS">MIPS Target Improvements</a>
1090</h3>
1091
1092<div>
1093
1094<p>New features and major changes in the MIPS target include:</p>
1095
1096<ul>
1097 <li>Most MIPS32r1 and r2 instructions are now supported.</li>
1098 <li>LE/BE MIPS32r1/r2 has been tested extensively.</li>
1099 <li>O32 ABI has been fully tested.</li>
1100 <li>MIPS backend has migrated to using the MC infrastructure for assembly printing. Initial support for direct object code emission has been implemented too.</li>
1101 <li>Delay slot filler has been updated. Now it tries to fill delay slots with useful instructions instead of always filling them with NOPs.</li>
1102 <li>Support for old-style JIT is complete.</li>
1103 <li>Support for old architectures (MIPS1 and MIPS2) has been removed.</li>
1104 <li>Initial support for MIPS64 has been added.</li>
1105</ul>
1106</div>
Chris Lattner7b95c382011-11-15 22:23:46 +0000[diff] [blame]1107
1108<!--=========================================================================-->
1109<h3>
1110 <a name="PTX">PTX Target Improvements</a>
1111</h3>
1112
1113<div>
Akira Hatanaka5381cbf2011-11-15 21:33:05 +0000[diff] [blame]1114
Chris Lattner7b95c382011-11-15 22:23:46 +0000[diff] [blame]1115 <p>
1116 The PTX back-end is still experimental, but is fairly usable for compute kernels
1117 in LLVM 3.0. Most scalar arithmetic is implemented, as well as intrinsics to
1118 access the special PTX registers and sync instructions. The major missing
1119 pieces are texture/sampler support and some vector operations.</p>
1120
1121 <p>That said, the backend is already being used for domain-specific languages
1122 and works well with the <a href="http://www.pcc.me.uk/~peter/libclc/">libclc
1123 library</a> to supply OpenCL built-ins. With it, you can use Clang to compile
1124 OpenCL code into PTX and execute it by loading the resulting PTX as a binary
1125 blob using the nVidia OpenCL library. It has been tested with several OpenCL
1126 programs, including some from the nVidia GPU Computing SDK, and the performance
1127 is on par with the nVidia compiler.</p>
1128
1129</div>
1130
Akira Hatanaka5381cbf2011-11-15 21:33:05 +0000[diff] [blame]1131<!--=========================================================================-->
1132<h3>
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]1133<a name="OtherTS">Other Target Specific Improvements</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1134</h3>
Chris Lattnerc441fb82009-03-01 02:30:21 +0000[diff] [blame]1135
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1136<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1137
Chris Lattnerc343e312011-11-10 20:15:40 +0000[diff] [blame]1138 <p>PPC32/ELF va_arg was implemented.</p>
1139 <p>PPC32 initial support for .o file writing was implemented.</p>
Wesley Peck3ff16db2011-11-14 18:56:41 +0000[diff] [blame]1140 <p>MicroBlaze scheduling itineraries were added that model the
1141 3-stage and the 5-stage pipeline architectures. The 3-stage
1142 pipeline model can be selected with <code>-mcpu=mblaze3</code>
1143 and the 5-stage pipeline model can be selected with
1144 <code>-mcpu=mblaze5</code>.</p>
Chris Lattnerc343e312011-11-10 20:15:40 +0000[diff] [blame]1145
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]1146<ul>
Chad Rosiere6291d02011-05-27 22:50:46 +0000[diff] [blame]1147<!--
1148<li></li>
1149-->
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]1150</ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1151
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]1152</div>
Chris Lattner77d29b12008-06-05 08:02:49 +0000[diff] [blame]1153
1154<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1155<h3>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]1156<a name="changes">Major Changes and Removed Features</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1157</h3>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]1158
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1159<div>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]1160
Bill Wendling2626dba2011-08-03 22:18:20 +0000[diff] [blame]1161<p>If you're already an LLVM user or developer with out-of-tree changes based on
1162 LLVM 2.9, this section lists some "gotchas" that you may run into upgrading
1163 from the previous release.</p>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]1164
1165<ul>
Chris Lattner5a1731d2011-11-27 08:32:32 +0000[diff] [blame]1166 <li>The <code>LLVMC</code> meta compiler driver was removed.</li>
Jay Foadf42e9b22011-08-04 10:43:43 +0000[diff] [blame]1167 <li>The <code>LowerSetJmp</code> pass wasn't used effectively by any
1168 target and has been removed.</li>
Rafael Espindolaf940a1a2011-08-30 23:03:45 +0000[diff] [blame]1169 <li>The old <code>TailDup</code> pass was not used in the standard pipeline
1170 and was unable to update ssa form, so it has been removed.
Eli Friedmanf03bb262011-08-12 22:50:01 +0000[diff] [blame]1171 <li>The syntax of volatile loads and stores in IR has been changed to
1172 "<code>load volatile</code>"/"<code>store volatile</code>". The old
1173 syntax ("<code>volatile load</code>"/"<code>volatile store</code>")
1174 is still accepted, but is now considered deprecated.</li>
Benjamin Kramer7c5025b2011-11-25 21:26:00 +0000[diff] [blame]1175 <li>The old atomic intrinsics (<code>llvm.memory.barrier</code> and
Eli Friedman526e1bb2011-10-26 00:55:23 +0000[diff] [blame]1176 <code>llvm.atomic.*</code>) are now gone. Please use the new atomic
1177 instructions, described in the <a href="Atomics.html">atomics guide</a>.
Devang Patelb34dd132008-10-14 20:03:43 +0000[diff] [blame]1178</ul>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]1179
NAKAMURA Takumi2026de22011-08-22 23:22:05 +0000[diff] [blame]1180<h4>Windows (32-bit)</h4>
1181<div>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1182
NAKAMURA Takumi2026de22011-08-22 23:22:05 +0000[diff] [blame]1183<ul>
1184 <li>On Win32(MinGW32 and MSVC), Windows 2000 will not be supported.
1185 Windows XP or higher is required.</li>
1186</ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1187
NAKAMURA Takumi2026de22011-08-22 23:22:05 +0000[diff] [blame]1188</div>
1189
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]1190</div>
1191
Daniel Dunbarf0233c62010-10-04 20:11:41 +0000[diff] [blame]1192<!--=========================================================================-->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1193<h3>
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]1194<a name="api_changes">Internal API Changes</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1195</h3>
Daniel Dunbarf0233c62010-10-04 20:11:41 +0000[diff] [blame]1196
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1197<div>
Daniel Dunbarf0233c62010-10-04 20:11:41 +0000[diff] [blame]1198
Chris Lattner1efe27e2011-04-06 00:45:11 +0000[diff] [blame]1199<p>In addition, many APIs have changed in this release. Some of the major
Bill Wendling16005252011-08-02 06:20:17 +0000[diff] [blame]1200 LLVM API changes are:</p>
Daniel Dunbarf0233c62010-10-04 20:11:41 +0000[diff] [blame]1201
1202<ul>
Benjamin Kramer7c5025b2011-11-25 21:26:00 +0000[diff] [blame]1203 <li>The biggest and most pervasive change is that llvm::Types are no longer
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1204 returned or accepted as 'const' values. Instead, just pass around
Benjamin Kramer7c5025b2011-11-25 21:26:00 +0000[diff] [blame]1205 non-const Types.</li>
Chris Lattnerd1324302011-07-18 04:56:02 +0000[diff] [blame]1206
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1207 <li><code>PHINode::reserveOperandSpace</code> has been removed. Instead, you
1208 must specify how many operands to reserve space for when you create the
1209 PHINode, by passing an extra argument
1210 into <code>PHINode::Create</code>.</li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]1211
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1212 <li>PHINodes no longer store their incoming BasicBlocks as operands. Instead,
1213 the list of incoming BasicBlocks is stored separately, and can be accessed
1214 with new functions <code>PHINode::block_begin</code>
1215 and <code>PHINode::block_end</code>.</li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]1216
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1217 <li>Various functions now take an <code>ArrayRef</code> instead of either a
1218 pair of pointers (or iterators) to the beginning and end of a range, or a
1219 pointer and a length. Others now return an <code>ArrayRef</code> instead
1220 of a reference to a <code>SmallVector</code>
1221 or <code>std::vector</code>. These include:
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]1222<ul>
1223<!-- Please keep this list sorted. -->
Jay Foada3efbb12011-07-15 08:37:34 +0000[diff] [blame]1224<li><code>CallInst::Create</code></li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]1225<li><code>ComputeLinearIndex</code> (in <code>llvm/CodeGen/Analysis.h</code>)</li>
1226<li><code>ConstantArray::get</code></li>
1227<li><code>ConstantExpr::getExtractElement</code></li>
Jay Foaddab3d292011-07-21 14:31:17 +0000[diff] [blame]1228<li><code>ConstantExpr::getGetElementPtr</code></li>
1229<li><code>ConstantExpr::getInBoundsGetElementPtr</code></li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]1230<li><code>ConstantExpr::getIndices</code></li>
1231<li><code>ConstantExpr::getInsertElement</code></li>
1232<li><code>ConstantExpr::getWithOperands</code></li>
Jay Foad1d2f5692011-07-19 13:32:40 +0000[diff] [blame]1233<li><code>ConstantFoldCall</code> (in <code>llvm/Analysis/ConstantFolding.h</code>)</li>
1234<li><code>ConstantFoldInstOperands</code> (in <code>llvm/Analysis/ConstantFolding.h</code>)</li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]1235<li><code>ConstantVector::get</code></li>
1236<li><code>DIBuilder::createComplexVariable</code></li>
1237<li><code>DIBuilder::getOrCreateArray</code></li>
1238<li><code>ExtractValueInst::Create</code></li>
1239<li><code>ExtractValueInst::getIndexedType</code></li>
1240<li><code>ExtractValueInst::getIndices</code></li>
1241<li><code>FindInsertedValue</code> (in <code>llvm/Analysis/ValueTracking.h</code>)</li>
Jay Foadca12a212011-07-19 14:42:50 +0000[diff] [blame]1242<li><code>gep_type_begin</code> (in <code>llvm/Support/GetElementPtrTypeIterator.h</code>)</li>
1243<li><code>gep_type_end</code> (in <code>llvm/Support/GetElementPtrTypeIterator.h</code>)</li>
Jay Foada9203102011-07-25 09:48:08 +0000[diff] [blame]1244<li><code>GetElementPtrInst::Create</code></li>
1245<li><code>GetElementPtrInst::CreateInBounds</code></li>
1246<li><code>GetElementPtrInst::getIndexedType</code></li>
Jay Foadb60e8512011-07-21 14:42:51 +0000[diff] [blame]1247<li><code>InsertValueInst::Create</code></li>
1248<li><code>InsertValueInst::getIndices</code></li>
1249<li><code>InvokeInst::Create</code></li>
Jay Foada3efbb12011-07-15 08:37:34 +0000[diff] [blame]1250<li><code>IRBuilder::CreateCall</code></li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]1251<li><code>IRBuilder::CreateExtractValue</code></li>
Jay Foad0a2a60a2011-07-22 08:16:57 +0000[diff] [blame]1252<li><code>IRBuilder::CreateGEP</code></li>
1253<li><code>IRBuilder::CreateInBoundsGEP</code></li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]1254<li><code>IRBuilder::CreateInsertValue</code></li>
Jay Foada3efbb12011-07-15 08:37:34 +0000[diff] [blame]1255<li><code>IRBuilder::CreateInvoke</code></li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]1256<li><code>MDNode::get</code></li>
1257<li><code>MDNode::getIfExists</code></li>
1258<li><code>MDNode::getTemporary</code></li>
1259<li><code>MDNode::getWhenValsUnresolved</code></li>
Jay Foadb9b54eb2011-07-19 15:07:52 +0000[diff] [blame]1260<li><code>SimplifyGEPInst</code> (in <code>llvm/Analysis/InstructionSimplify.h</code>)</li>
Jay Foad8fbbb392011-07-19 14:01:37 +0000[diff] [blame]1261<li><code>TargetData::getIndexedOffset</code></li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]1262</ul></li>
1263
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1264 <li>All forms of <code>StringMap::getOrCreateValue</code> have been remove
1265 except for the one which takes a <code>StringRef</code>.</li>
Jay Foad558d3762011-07-14 09:19:05 +0000[diff] [blame]1266
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1267 <li>The <code>LLVMBuildUnwind</code> function from the C API was removed. The
1268 LLVM <code>unwind</code> instruction has been deprecated for a long time
1269 and isn't used by the current front-ends. So this was removed during the
1270 exception handling rewrite.</li>
Bill Wendling16005252011-08-02 06:20:17 +0000[diff] [blame]1271
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1272 <li>The <code>LLVMAddLowerSetJmpPass</code> function from the C API was
1273 removed because the <code>LowerSetJmp</code> pass was removed.</li>
Bill Wendling2626dba2011-08-03 22:18:20 +0000[diff] [blame]1274
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1275 <li>The <code>DIBuilder</code> interface used by front ends to encode
1276 debugging information in the LLVM IR now expects clients to
1277 use <code>DIBuilder::finalize()</code> at the end of translation unit to
1278 complete debugging information encoding.</li>
Devang Patel6326a422011-08-15 23:00:00 +0000[diff] [blame]1279
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1280 <li>The way the type system works has been
1281 rewritten: <code>PATypeHolder</code> and <code>OpaqueType</code> are gone,
1282 and all APIs deal with <code>Type*</code> instead of <code>const
1283 Type*</code>. If you need to create recursive structures, then create a
1284 named structure, and use <code>setBody()</code> when all its elements are
1285 built. Type merging and refining is gone too: named structures are not
1286 merged with other structures, even if their layout is identical. (of
1287 course anonymous structures are still uniqued by layout).</li>
Torok Edwinf16e2d42011-09-30 13:07:52 +0000[diff] [blame]1288
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1289 <li>TargetSelect.h moved to Support/ from Target/</li>
Torok Edwinf16e2d42011-09-30 13:07:52 +0000[diff] [blame]1290
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1291 <li>UpgradeIntrinsicCall no longer upgrades pre-2.9 intrinsic calls (for
1292 example <code>llvm.memset.i32</code>).</li>
Torok Edwinf16e2d42011-09-30 13:07:52 +0000[diff] [blame]1293
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1294 <li>It is mandatory to initialize all out-of-tree passes too and their dependencies now with
1295 <code>INITIALIZE_PASS{BEGIN,END,}</code>
1296 and <code>INITIALIZE_{PASS,AG}_DEPENDENCY</code>.</li>
Torok Edwinf16e2d42011-09-30 13:07:52 +0000[diff] [blame]1297
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1298 <li>The interface for MemDepResult in MemoryDependenceAnalysis has been
1299 enhanced with new return types Unknown and NonFuncLocal, in addition to
1300 the existing types Clobber, Def, and NonLocal.</li>
Daniel Dunbarf0233c62010-10-04 20:11:41 +0000[diff] [blame]1301</ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1302
Daniel Dunbarf0233c62010-10-04 20:11:41 +0000[diff] [blame]1303</div>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]1304
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1305</div>
1306
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1307<!-- *********************************************************************** -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1308<h2>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1309 <a name="knownproblems">Known Problems</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1310</h2>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1311<!-- *********************************************************************** -->
1312
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1313<div>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1314
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1315<p>This section contains significant known problems with the LLVM system, listed
1316 by component. If you run into a problem, please check
1317 the <a href="http://llvm.org/bugs/">LLVM bug database</a> and submit a bug if
1318 there isn't already one.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1319
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]1320<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1321<h3>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]1322 <a name="experimental">Experimental features included with this release</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1323</h3>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1324
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1325<div>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]1326
Misha Brukman6df9e2c2004-05-12 21:46:05 +0000[diff] [blame]1327<p>The following components of this LLVM release are either untested, known to
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1328 be broken or unreliable, or are in early development. These components
1329 should not be relied on, and bugs should not be filed against them, but they
1330 may be useful to some people. In particular, if you would like to work on
1331 one of these components, please contact us on
1332 the <a href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVMdev
1333 list</a>.</p>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]1334
1335<ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1336 <li>The Alpha, Blackfin, CellSPU, MicroBlaze, MSP430, MIPS, PTX, SystemZ and
1337 XCore backends are experimental.</li>
1338
1339 <li><tt>llc</tt> "<tt>-filetype=obj</tt>" is experimental on all targets other
1340 than darwin and ELF X86 systems.</li>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]1341</ul>
1342
1343</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1344
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1345<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1346<h3>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1347 <a name="x86-be">Known problems with the X86 back-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1348</h3>
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]1349
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1350<div>
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]1351
1352<ul>
Chris Lattnerc78daaf2011-11-17 01:42:23 +0000[diff] [blame]1353 <li>The X86-64 backend <a href="http://llvm.org/PR1740">does not yet support
1354 the <tt>va_arg</tt> LLVM IR instruction</a>. Currently, front-ends support
1355 variadic argument constructs on X86-64 by lowering them manually.</li>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1356</ul>
1357
1358</div>
1359
1360<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1361<h3>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1362 <a name="ppc-be">Known problems with the PowerPC back-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1363</h3>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1364
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1365<div>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1366
1367<ul>
Roman Divacky223764c2011-10-30 07:49:04 +0000[diff] [blame]1368 <li>The PPC32/ELF support lacks PIC support.</li>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1369</ul>
1370
1371</div>
1372
1373<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1374<h3>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]1375 <a name="arm-be">Known problems with the ARM back-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1376</h3>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]1377
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1378<div>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]1379
1380<ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1381 <li>Thumb mode works only on ARMv6 or higher processors. On sub-ARMv6
1382 processors, thumb programs can crash or produce wrong results
1383 (<a href="http://llvm.org/PR1388">PR1388</a>).</li>
1384
1385 <li>Compilation for ARM Linux OABI (old ABI) is supported but not fully
1386 tested.</li>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]1387</ul>
1388
1389</div>
1390
1391<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1392<h3>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1393 <a name="sparc-be">Known problems with the SPARC back-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1394</h3>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1395
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1396<div>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1397
1398<ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1399 <li>The SPARC backend only supports the 32-bit SPARC ABI (-m32); it does not
1400 support the 64-bit SPARC ABI (-m64).</li>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1401</ul>
1402
1403</div>
1404
1405<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1406<h3>
Bruno Cardoso Lopesb7e1a4f2008-10-25 14:56:26 +0000[diff] [blame]1407 <a name="mips-be">Known problems with the MIPS back-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1408</h3>
Bruno Cardoso Lopesb7e1a4f2008-10-25 14:56:26 +0000[diff] [blame]1409
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1410<div>
Bruno Cardoso Lopesb7e1a4f2008-10-25 14:56:26 +0000[diff] [blame]1411
1412<ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1413 <li>64-bit MIPS targets are not supported yet.</li>
Bruno Cardoso Lopesb7e1a4f2008-10-25 14:56:26 +0000[diff] [blame]1414</ul>
1415
1416</div>
1417
1418<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1419<h3>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1420 <a name="alpha-be">Known problems with the Alpha back-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1421</h3>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1422
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1423<div>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1424
1425<ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1426 <li>On 21164s, some rare FP arithmetic sequences which may trap do not have
1427 the appropriate nops inserted to ensure restartability.</li>
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]1428</ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1429
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]1430</div>
1431
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1432<!-- ======================================================================= -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1433<h3>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]1434 <a name="c-be">Known problems with the C back-end</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1435</h3>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1436
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1437<div>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1438
Chris Lattner3016ee92010-09-29 05:34:42 +0000[diff] [blame]1439<p>The C backend has numerous problems and is not being actively maintained.
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1440 Depending on it for anything serious is not advised.</p>
Chris Lattner3016ee92010-09-29 05:34:42 +0000[diff] [blame]1441
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1442<ul>
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1443 <li><a href="http://llvm.org/PR802">The C backend has only basic support for
1444 inline assembly code</a>.</li>
1445
1446 <li><a href="http://llvm.org/PR1658">The C backend violates the ABI of common
1447 C++ programs</a>, preventing intermixing between C++ compiled by the CBE
1448 and C++ code compiled with <tt>llc</tt> or native compilers.</li>
1449
1450 <li>The C backend does not support all exception handling constructs.</li>
1451
1452 <li>The C backend does not support arbitrary precision integers.</li>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]1453</ul>
1454
1455</div>
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]1456
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1457</div>
1458
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1459<!-- *********************************************************************** -->
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1460<h2>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1461 <a name="additionalinfo">Additional Information</a>
NAKAMURA Takumi06c6d9a2011-04-18 01:17:51 +0000[diff] [blame]1462</h2>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1463<!-- *********************************************************************** -->
1464
NAKAMURA Takumi074eeaa2011-04-21 01:52:00 +0000[diff] [blame]1465<div>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1466
Bill Wendling7b7fa742011-10-26 18:46:16 +0000[diff] [blame]1467<p>A wide variety of additional information is available on
1468 the <a href="http://llvm.org/">LLVM web page</a>, in particular in
1469 the <a href="http://llvm.org/docs/">documentation</a> section. The web page
1470 also contains versions of the API documentation which is up-to-date with the
1471 Subversion version of the source code. You can access versions of these
1472 documents specific to this release by going into the "<tt>llvm/doc/</tt>"
1473 directory in the LLVM tree.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1474
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1475<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]1476 us via the <a href="http://llvm.org/docs/#maillist"> mailing lists</a>.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1477
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1478</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1479
1480<!-- *********************************************************************** -->
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1481
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1482<hr>
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]1483<address>
Misha Brukman38847d52003-12-21 22:53:21 +0000[diff] [blame]1484 <a href="http://jigsaw.w3.org/css-validator/check/referer"><img
Misha Brukman44408702008-12-11 17:34:48 +0000[diff] [blame]1485 src="http://jigsaw.w3.org/css-validator/images/vcss-blue" alt="Valid CSS"></a>
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]1486 <a href="http://validator.w3.org/check/referer"><img
Misha Brukman44408702008-12-11 17:34:48 +0000[diff] [blame]1487 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]1488
Chris Lattnerb4b0ce72007-05-18 00:44:29 +0000[diff] [blame]1489 <a href="http://llvm.org/">LLVM Compiler Infrastructure</a><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1490 Last modified: $Date$
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]1491</address>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]1492
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1493</body>
1494</html>