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gerrit-public.fairphone.software / toolchain / llvm-project / 6184f4db34942822c369fc70be1700c506f111e0 / . / llvm / docs / ReleaseNotes.html
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Misha Brukman80731b92003-11-22 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 Spencere4190fa2004-11-18 18:38:58 +0000[diff] [blame]5 <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]6 <link rel="stylesheet" href="llvm.css" type="text/css">
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]7 <title>LLVM 2.7 Release Notes</title>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]8</head>
9<body>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]10
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]11<div class="doc_title">LLVM 2.7 Release Notes</div>
Mikhail Glushenkov024f7cf2008-10-13 02:08:34 +0000[diff] [blame]12
Chris Lattnerc871bac2010-03-17 04:02:39 +0000[diff] [blame]13<img align=right src="http://llvm.org/img/DragonSmall.png"
14 width="136" height="136">
15
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]16<ol>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]17 <li><a href="#intro">Introduction</a></li>
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]18 <li><a href="#subproj">Sub-project Status Update</a></li>
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]19 <li><a href="#externalproj">External Projects Using LLVM 2.7</a></li>
20 <li><a href="#whatsnew">What's New in LLVM 2.7?</a></li>
Chris Lattner77a51732004-04-30 22:17:12 +0000[diff] [blame]21 <li><a href="GettingStarted.html">Installation Instructions</a></li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]22 <li><a href="#portability">Portability and Supported Platforms</a></li>
Dan Gohmanad888912008-10-14 16:23:02 +0000[diff] [blame]23 <li><a href="#knownproblems">Known Problems</a></li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]24 <li><a href="#additionalinfo">Additional Information</a></li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]25</ol>
26
Chris Lattner020e1fc2004-05-23 21:07:27 +0000[diff] [blame]27<div class="doc_author">
Dan Gohmanad888912008-10-14 16:23:02 +0000[diff] [blame]28 <p>Written by the <a href="http://llvm.org">LLVM Team</a></p>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]29</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]30
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]31<h1 style="color:red">These are in-progress notes for the upcoming LLVM 2.7
32release.<br>
33You may prefer the
34<a href="http://llvm.org/releases/2.6/docs/ReleaseNotes.html">LLVM 2.6
35Release Notes</a>.</h1>
36
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]37<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]38<div class="doc_section">
39 <a name="intro">Introduction</a>
40</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]41<!-- *********************************************************************** -->
42
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]43<div class="doc_text">
44
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]45<p>This document contains the release notes for the LLVM Compiler
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]46Infrastructure, release 2.7. Here we describe the status of LLVM, including
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]47major improvements from the previous release and significant known problems.
Mikhail Glushenkov25422542009-03-01 18:09:47 +0000[diff] [blame]48All LLVM releases may be downloaded from the <a
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]49href="http://llvm.org/releases/">LLVM releases web site</a>.</p>
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]50
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]51<p>For more information about LLVM, including information about the latest
Chris Lattnera69595e2005-10-29 07:07:09 +0000[diff] [blame]52release, please check out the <a href="http://llvm.org/">main LLVM
Chris Lattnere7525b52003-10-07 21:38:31 +0000[diff] [blame]53web site</a>. If you have questions or comments, the <a
Chris Lattner0b1c9a52010-03-17 04:41:49 +0000[diff] [blame]54href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVM Developer's
55Mailing List</a> is a good place to send them.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]56
Mikhail Glushenkov024f7cf2008-10-13 02:08:34 +0000[diff] [blame]57<p>Note that if you are reading this file from a Subversion checkout or the
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]58main LLVM web page, this document applies to the <i>next</i> release, not the
Gabor Greif355f81c2008-10-14 11:00:32 +0000[diff] [blame]59current one. To see the release notes for a specific release, please see the
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]60<a href="http://llvm.org/releases/">releases page</a>.</p>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]61
Chris Lattner0b1c9a52010-03-17 04:41:49 +0000[diff] [blame]62
Chris Lattner10a3cc42010-03-17 06:41:58 +0000[diff] [blame]63<p>FIXME: llvm.org moved to new server, mention new logo, Ted and Doug new code
64 owners.</p>
Chris Lattner0b1c9a52010-03-17 04:41:49 +0000[diff] [blame]65
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]66</div>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]67
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]68
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]69<!--
70Almost dead code.
71 include/llvm/Analysis/LiveValues.h => Dan
72 lib/Transforms/IPO/MergeFunctions.cpp => consider for 2.8.
73 llvm/Analysis/PointerTracking.h => Edwin wants this, consider for 2.8.
Chris Lattner2bfa1672010-01-09 22:30:40 +0000[diff] [blame]74 ABCD, SCCVN, GEPSplitterPass
Chris Lattner89ea59d2010-01-16 21:25:13 +0000[diff] [blame]75 MSIL backend?
Chris Lattner10a3cc42010-03-17 06:41:58 +0000[diff] [blame]76 lib/Transforms/Utils/SSI.cpp -> ABCD depends on it.
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]77-->
78
79
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]80<!-- Features that need text if they're finished for 2.7:
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]81 gcc plugin.
82 strong phi elim
83 variable debug info for optimized code
Chris Lattner53e06f92009-02-26 22:33:38 +0000[diff] [blame]84 postalloc scheduler: anti dependence breaking, hazard recognizer?
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]85 metadata
86 loop dependence analysis
87 ELF Writer? How stable?
88 <li>PostRA scheduler improvements, ARM adoption (David Goodwin).</li>
Chris Lattner2b8a52e2008-02-10 07:46:44 +0000[diff] [blame]89 -->
Mikhail Glushenkov024f7cf2008-10-13 02:08:34 +0000[diff] [blame]90
Chris Lattnerc4d68542008-10-12 19:47:48 +0000[diff] [blame]91 <!-- for announcement email:
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]92 Logo web page.
93 llvm devmtg
94 compiler_rt
95 KLEE web page at klee.llvm.org
96 Many new papers added to /pubs/
Chris Lattner10a3cc42010-03-17 06:41:58 +0000[diff] [blame]97 Mention gcc plugin.
Chris Lattnerd02da042009-02-25 06:34:50 +0000[diff] [blame]98 -->
Chris Lattner2b8a52e2008-02-10 07:46:44 +0000[diff] [blame]99
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]100<!-- *********************************************************************** -->
101<div class="doc_section">
102 <a name="subproj">Sub-project Status Update</a>
Chris Lattner625a3d82008-06-08 21:34:41 +0000[diff] [blame]103</div>
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]104<!-- *********************************************************************** -->
Chris Lattner625a3d82008-06-08 21:34:41 +0000[diff] [blame]105
106<div class="doc_text">
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]107<p>
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]108The LLVM 2.7 distribution currently consists of code from the core LLVM
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]109repository (which roughly includes the LLVM optimizers, code generators
110and supporting tools), the Clang repository and the llvm-gcc repository. In
111addition to this code, the LLVM Project includes other sub-projects that are in
112development. Here we include updates on these subprojects.
Bill Wendlingf170d2e2009-03-02 04:28:57 +0000[diff] [blame]113</p>
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]114
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]115</div>
116
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]117
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]118<!--=========================================================================-->
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]119<div class="doc_subsection">
Chris Lattner44c09cd2008-10-13 18:11:54 +0000[diff] [blame]120<a name="clang">Clang: C/C++/Objective-C Frontend Toolkit</a>
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]121</div>
122
123<div class="doc_text">
124
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]125<p>The <a href="http://clang.llvm.org/">Clang project</a> is ...</p>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]126
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]127<p>In the LLVM 2.7 time-frame, the Clang team has made many improvements:</p>
Bill Wendlingef362462008-10-27 09:27:33 +0000[diff] [blame]128
Daniel Dunbarc11b40f2008-10-14 23:25:09 +0000[diff] [blame]129<ul>
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]130<li>...</li>
Chris Lattner10a3cc42010-03-17 06:41:58 +0000[diff] [blame]131include a link to cxx_compatibility.html
Bill Wendling87adbe42009-03-02 04:28:18 +0000[diff] [blame]132</ul>
Chris Lattner44c09cd2008-10-13 18:11:54 +0000[diff] [blame]133</div>
134
135<!--=========================================================================-->
136<div class="doc_subsection">
137<a name="clangsa">Clang Static Analyzer</a>
138</div>
139
140<div class="doc_text">
141
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]142<p>Previously announced in the 2.4, 2.5, and 2.6 LLVM releases, the Clang project also
Ted Kremenekc11fae82009-02-27 07:01:32 +0000[diff] [blame]143includes an early stage static source code analysis tool for <a
144href="http://clang.llvm.org/StaticAnalysis.html">automatically finding bugs</a>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]145in C and Objective-C programs. The tool performs checks to find
Ted Kremenekc11fae82009-02-27 07:01:32 +0000[diff] [blame]146bugs that occur on a specific path within a program.</p>
Chris Lattnerbcffa5a2008-10-14 00:52:49 +0000[diff] [blame]147
Chris Lattnerc871bac2010-03-17 04:02:39 +0000[diff] [blame]148<p>In the LLVM 2.7 time-frame, the analyzer core has sprouted legs and...</p>
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]149
150</div>
151
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]152<!--=========================================================================-->
153<div class="doc_subsection">
Nicolas Geoffraye5ec9322008-10-14 19:23:04 +0000[diff] [blame]154<a name="vmkit">VMKit: JVM/CLI Virtual Machine Implementation</a>
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]155</div>
156
157<div class="doc_text">
158<p>
Nicolas Geoffraye5ec9322008-10-14 19:23:04 +0000[diff] [blame]159The <a href="http://vmkit.llvm.org/">VMKit project</a> is an implementation of
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]160a JVM and a CLI Virtual Machine (Microsoft .NET is an
161implementation of the CLI) using LLVM for static and just-in-time
162compilation.</p>
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]163
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]164<p>
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]165VMKit version ?? builds with LLVM 2.7 and you can find it on its
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]166<a href="http://vmkit.llvm.org/releases/">web page</a>. The release includes
Nicolas Geoffray54efd492008-10-15 20:25:04 +0000[diff] [blame]167bug fixes, cleanup and new features. The major changes are:</p>
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]168
Nicolas Geoffraye5ec9322008-10-14 19:23:04 +0000[diff] [blame]169<ul>
170
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]171<li>...</li>
Nicolas Geoffraye5ec9322008-10-14 19:23:04 +0000[diff] [blame]172
173</ul>
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]174</div>
175
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]176
177<!--=========================================================================-->
178<div class="doc_subsection">
179<a name="compiler-rt">compiler-rt: Compiler Runtime Library</a>
180</div>
181
182<div class="doc_text">
183<p>
184The new LLVM <a href="http://compiler-rt.llvm.org/">compiler-rt project</a>
185is a simple library that provides an implementation of the low-level
186target-specific hooks required by code generation and other runtime components.
187For example, when compiling for a 32-bit target, converting a double to a 64-bit
188unsigned integer is compiled into a runtime call to the "__fixunsdfdi"
189function. The compiler-rt library provides highly optimized implementations of
190this and other low-level routines (some are 3x faster than the equivalent
191libgcc routines).</p>
192
193<p>
194All of the code in the compiler-rt project is available under the standard LLVM
195License, a "BSD-style" license.</p>
196
197</div>
198
199<!--=========================================================================-->
200<div class="doc_subsection">
201<a name="klee">KLEE: Symbolic Execution and Automatic Test Case Generator</a>
202</div>
203
204<div class="doc_text">
205<p>
206The new LLVM <a href="http://klee.llvm.org/">KLEE project</a> is a symbolic
207execution framework for programs in LLVM bitcode form. KLEE tries to
208symbolically evaluate "all" paths through the application and records state
209transitions that lead to fault states. This allows it to construct testcases
210that lead to faults and can even be used to verify algorithms. For more
211details, please see the <a
212href="http://llvm.org/pubs/2008-12-OSDI-KLEE.html">OSDI 2008 paper</a> about
213KLEE.</p>
214
215</div>
216
217<!--=========================================================================-->
218<div class="doc_subsection">
219<a name="dragonegg">DragonEgg: GCC-4.5 as an LLVM frontend</a>
220</div>
221
222<div class="doc_text">
223<p>
224The goal of <a href="http://dragonegg.llvm.org/">DragonEgg</a> is to make
225gcc-4.5 act like llvm-gcc without requiring any gcc modifications whatsoever.
Duncan Sands100d0e3c2009-10-15 08:17:44 +0000[diff] [blame]226<a href="http://dragonegg.llvm.org/">DragonEgg</a> is a shared library (dragonegg.so)
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]227that is loaded by gcc at runtime. It ...
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]228</p>
229
230</div>
231
232
233<!--=========================================================================-->
234<div class="doc_subsection">
235<a name="mc">llvm-mc: Machine Code Toolkit</a>
236</div>
237
238<div class="doc_text">
239<p>
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]240The LLVM Machine Code (MC) Toolkit project is ...
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]241</p>
242
243</div>
244
245
Chris Lattner53e06f92009-02-26 22:33:38 +0000[diff] [blame]246<!-- *********************************************************************** -->
247<div class="doc_section">
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]248 <a name="externalproj">External Open Source Projects Using LLVM 2.7</a>
Chris Lattner53e06f92009-02-26 22:33:38 +0000[diff] [blame]249</div>
250<!-- *********************************************************************** -->
251
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]252<div class="doc_text">
253
254<p>An exciting aspect of LLVM is that it is used as an enabling technology for
255 a lot of other language and tools projects. This section lists some of the
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]256 projects that have already been updated to work with LLVM 2.7.</p>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]257</div>
258
259
260<!--=========================================================================-->
261<div class="doc_subsection">
262<a name="Rubinius">Rubinius</a>
263</div>
264
265<div class="doc_text">
Chris Lattnerc871bac2010-03-17 04:02:39 +0000[diff] [blame]266Need update.
267<!--
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]268<p><a href="http://github.com/evanphx/rubinius">Rubinius</a> is an environment
269for running Ruby code which strives to write as much of the core class
270implementation in Ruby as possible. Combined with a bytecode interpreting VM, it
271uses LLVM to optimize and compile ruby code down to machine code. Techniques
272such as type feedback, method inlining, and uncommon traps are all used to
273remove dynamism from ruby execution and increase performance.</p>
274
275<p>Since LLVM 2.5, Rubinius has made several major leaps forward, implementing
276a counter based JIT, type feedback and speculative method inlining.
Chris Lattnerc871bac2010-03-17 04:02:39 +0000[diff] [blame]277-->
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]278</p>
279
280</div>
281
282<!--=========================================================================-->
283<div class="doc_subsection">
284<a name="macruby">MacRuby</a>
285</div>
286
287<div class="doc_text">
288
289<p>
Chris Lattnerc871bac2010-03-17 04:02:39 +0000[diff] [blame]290Need update.
291<!--
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]292<a href="http://macruby.org">MacRuby</a> is an implementation of Ruby on top of
293core Mac OS X technologies, such as the Objective-C common runtime and garbage
294collector and the CoreFoundation framework. It is principally developed by
295Apple and aims at enabling the creation of full-fledged Mac OS X applications.
296</p>
297
298<p>
299MacRuby uses LLVM for optimization passes, JIT and AOT compilation of Ruby
300expressions. It also uses zero-cost DWARF exceptions to implement Ruby exception
Chris Lattnerc871bac2010-03-17 04:02:39 +0000[diff] [blame]301handling.--> </p>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]302
303</div>
304
305
Chris Lattner53e06f92009-02-26 22:33:38 +0000[diff] [blame]306<!--=========================================================================-->
307<div class="doc_subsection">
308<a name="pure">Pure</a>
309</div>
310
311<div class="doc_text">
312<p>
Chris Lattnerc871bac2010-03-17 04:02:39 +0000[diff] [blame]313Need update.
314<!--
Chris Lattnerd1094e02009-03-02 02:37:32 +0000[diff] [blame]315<a href="http://pure-lang.googlecode.com/">Pure</a>
316is an algebraic/functional programming language based on term rewriting.
Chris Lattner53e06f92009-02-26 22:33:38 +0000[diff] [blame]317Programs are collections of equations which are used to evaluate expressions in
318a symbolic fashion. Pure offers dynamic typing, eager and lazy evaluation,
Mikhail Glushenkov25422542009-03-01 18:09:47 +0000[diff] [blame]319lexical closures, a hygienic macro system (also based on term rewriting),
Chris Lattner53e06f92009-02-26 22:33:38 +0000[diff] [blame]320built-in list and matrix support (including list and matrix comprehensions) and
321an easy-to-use C interface. The interpreter uses LLVM as a backend to
322 JIT-compile Pure programs to fast native code.</p>
323
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]324<p>Pure versions ??? and later have been tested and are known to work with
325LLVM 2.7 (and continue to work with older LLVM releases >= 2.3 as well).
Chris Lattnerc871bac2010-03-17 04:02:39 +0000[diff] [blame]326--></p>
Chris Lattner53e06f92009-02-26 22:33:38 +0000[diff] [blame]327</div>
328
329
330<!--=========================================================================-->
331<div class="doc_subsection">
332<a name="ldc">LLVM D Compiler</a>
333</div>
334
335<div class="doc_text">
336<p>
Chris Lattnerc871bac2010-03-17 04:02:39 +0000[diff] [blame]337Need update.
338<!--
Chris Lattnerd1094e02009-03-02 02:37:32 +0000[diff] [blame]339<a href="http://www.dsource.org/projects/ldc">LDC</a> is an implementation of
340the D Programming Language using the LLVM optimizer and code generator.
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]341The LDC project works great with the LLVM 2.6 release. General improvements in
John Criswellea03c9d2009-03-02 15:28:15 +0000[diff] [blame]342this
Chris Lattnerd1094e02009-03-02 02:37:32 +0000[diff] [blame]343cycle have included new inline asm constraint handling, better debug info
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]344support, general bug fixes and better x86-64 support. This has allowed
345some major improvements in LDC, getting it much closer to being as
Chris Lattnerc871bac2010-03-17 04:02:39 +0000[diff] [blame]346fully featured as the original DMD compiler from DigitalMars.-->
Chris Lattner53e06f92009-02-26 22:33:38 +0000[diff] [blame]347</p>
348</div>
349
Chris Lattnerfb23a962009-02-28 18:58:01 +0000[diff] [blame]350<!--=========================================================================-->
351<div class="doc_subsection">
352<a name="RoadsendPHP">Roadsend PHP</a>
353</div>
354
355<div class="doc_text">
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]356<p>
Chris Lattnerc871bac2010-03-17 04:02:39 +0000[diff] [blame]357Need update.
358<!--
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]359<a href="http://code.roadsend.com/rphp">Roadsend PHP</a> (rphp) is an open
Chris Lattner0c72d8f2009-03-02 19:07:24 +0000[diff] [blame]360source implementation of the PHP programming
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]361language that uses LLVM for its optimizer, JIT and static compiler. This is a
Chris Lattnerc871bac2010-03-17 04:02:39 +0000[diff] [blame]362reimplementation of an earlier project that is now based on LLVM.
363--> </p>
Chris Lattnerfb23a962009-02-28 18:58:01 +0000[diff] [blame]364</div>
Chris Lattner53e06f92009-02-26 22:33:38 +0000[diff] [blame]365
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]366<!--=========================================================================-->
367<div class="doc_subsection">
368<a name="UnladenSwallow">Unladen Swallow</a>
369</div>
370
371<div class="doc_text">
372<p>
Chris Lattnerc871bac2010-03-17 04:02:39 +0000[diff] [blame]373Need update.
374<!--
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]375<a href="http://code.google.com/p/unladen-swallow/">Unladen Swallow</a> is a
376branch of <a href="http://python.org/">Python</a> intended to be fully
377compatible and significantly faster. It uses LLVM's optimization passes and JIT
Chris Lattnerc871bac2010-03-17 04:02:39 +0000[diff] [blame]378compiler.-->
379</p>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]380</div>
381
382<!--=========================================================================-->
383<div class="doc_subsection">
384<a name="llvm-lua">llvm-lua</a>
385</div>
386
387<div class="doc_text">
388<p>
Chris Lattnerc871bac2010-03-17 04:02:39 +0000[diff] [blame]389Need update.
390<!--
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]391<a href="http://code.google.com/p/llvm-lua/">LLVM-Lua</a> uses LLVM to add JIT
392and static compiling support to the Lua VM. Lua bytecode is analyzed to
393remove type checks, then LLVM is used to compile the bytecode down to machine
Chris Lattnerc871bac2010-03-17 04:02:39 +0000[diff] [blame]394code.-->
395</p>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]396</div>
397
398<!--=========================================================================-->
399<div class="doc_subsection">
400<a name="icedtea">IcedTea Java Virtual Machine Implementation</a>
401</div>
402
403<div class="doc_text">
404<p>
Chris Lattnerc871bac2010-03-17 04:02:39 +0000[diff] [blame]405Need update.
406<!--
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]407<a href="http://icedtea.classpath.org/wiki/Main_Page">IcedTea</a> provides a
408harness to build OpenJDK using only free software build tools and to provide
409replacements for the not-yet free parts of OpenJDK. One of the extensions that
410IcedTea provides is a new JIT compiler named <a
411href="http://icedtea.classpath.org/wiki/ZeroSharkFaq">Shark</a> which uses LLVM
412to provide native code generation without introducing processor-dependent
Chris Lattnerc871bac2010-03-17 04:02:39 +0000[diff] [blame]413code.-->
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]414</p>
415</div>
416
417
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]418
419<!-- *********************************************************************** -->
420<div class="doc_section">
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]421 <a name="whatsnew">What's New in LLVM 2.7?</a>
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]422</div>
423<!-- *********************************************************************** -->
424
Chris Lattnerb7bc2aa2008-06-08 22:59:35 +0000[diff] [blame]425<div class="doc_text">
426
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]427<p>This release includes a huge number of bug fixes, performance tweaks and
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]428minor improvements. Some of the major improvements and new features are listed
429in this section.
Chris Lattnerb7bc2aa2008-06-08 22:59:35 +0000[diff] [blame]430</p>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]431
Chris Lattnerb7bc2aa2008-06-08 22:59:35 +0000[diff] [blame]432</div>
433
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]434<!--=========================================================================-->
Chris Lattner625a3d82008-06-08 21:34:41 +0000[diff] [blame]435<div class="doc_subsection">
Chris Lattnercdc44ed2008-02-06 18:00:06 +0000[diff] [blame]436<a name="majorfeatures">Major New Features</a>
437</div>
438
439<div class="doc_text">
440
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]441<p>LLVM 2.7 includes several major new capabilities:</p>
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]442
443<ul>
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]444<li>...</li>
Chris Lattner458e79f2008-02-10 08:18:42 +0000[diff] [blame]445</ul>
446
Chris Lattner0b1c9a52010-03-17 04:41:49 +0000[diff] [blame]447Extensible metadata solid.
448
449Debug info improvements: using metadata instead of llvm.dbg global variables.
450This brings several enhancements including improved compile times.
451
452New instruction selector.
453GHC Haskell ABI/ calling conv support.
454Pre-Alpha support for unions in IR.
455New InlineHint and StackAlignment function attributes
456Code generator MC'ized except for debug info and EH.
457New SCEV AA pass: -scev-aa
458Inliner reuses arrays allocas when inlining multiple callers to reduce stack usage.
459MC encoding and disassembler apis.
460Optimal Edge Profiling?
461Instcombine is now a library, has its own IRBuilder to simplify itself.
462New llvm/Support/Regex.h API. FileCheck now does regex's
Chris Lattner10a3cc42010-03-17 06:41:58 +0000[diff] [blame]463Many subtle pointer invalidation bugs in Callgraph have been fixed and it now uses asserting value handles.
464MC Disassembler (with blog post), MCInstPrinter. Many X86 backend and AsmPrinter simplifications
465Various tools like llc and opt now read either .ll or .bc files as input.
466Malloc and free instructions got removed.
467compiler-rt support for ARM.
468completely llvm-gcc NEON support.
469Can transcode from GAS to intel syntax with "llvm-mc foo.s -output-asm-variant=1"
470JIT debug information with GDB 7.0
471New CodeGen Level LICM And CSE (did it make 2.7?)
472CMake can now run tests, what other improvements?
473ARM/Thumb register scavenging improvements?
474New SSAUpdater and MachineSSAUpdater classes for unstructured ssa updating,
475 changed jump threading, GVN, etc to use it which simplified them and speed
476 them up.
Chris Lattner6184f4d2010-03-17 06:42:25 +0000[diff] [blame^]477Combiner-AA improvements, why not on by default?
Chris Lattner0b1c9a52010-03-17 04:41:49 +0000[diff] [blame]478
Chris Lattner10a3cc42010-03-17 06:41:58 +0000[diff] [blame]479CondProp pass removed (functionality merged into jump threading).
Chris Lattner0b1c9a52010-03-17 04:41:49 +0000[diff] [blame]480AndersAA got removed (from 2.7 or mainline?)
Chris Lattner10a3cc42010-03-17 06:41:58 +0000[diff] [blame]481PredSimplify, LoopVR, GVNPRE got removed.
Chris Lattner0b1c9a52010-03-17 04:41:49 +0000[diff] [blame]482LLVM command line tools now overwrite their output, before they would only do this with -f.
483DOUT removed, use DEBUG(errs() instead.
484Much stuff converted to use raw_ostream instead of std::ostream.
485TargetAsmInfo renamed to MCAsmInfo
486llvm/ADT/iterator.h gone.
487
Chris Lattner10a3cc42010-03-17 06:41:58 +0000[diff] [blame]488
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]489</div>
490
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]491<!--=========================================================================-->
492<div class="doc_subsection">
Chris Lattnerd1094e02009-03-02 02:37:32 +0000[diff] [blame]493<a name="coreimprovements">LLVM IR and Core Improvements</a>
Chris Lattnerdd6acc02008-02-10 08:17:19 +0000[diff] [blame]494</div>
495
496<div class="doc_text">
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]497<p>LLVM IR has several new features for better support of new targets and that
498expose new optimization opportunities:</p>
Chris Lattnerdd6acc02008-02-10 08:17:19 +0000[diff] [blame]499
Chris Lattnerb7112222008-06-05 06:25:56 +0000[diff] [blame]500<ul>
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]501<li>...</li>
Chris Lattnerdd6acc02008-02-10 08:17:19 +0000[diff] [blame]502</ul>
Mikhail Glushenkov024f7cf2008-10-13 02:08:34 +0000[diff] [blame]503
Chris Lattnerdd6acc02008-02-10 08:17:19 +0000[diff] [blame]504</div>
505
506<!--=========================================================================-->
507<div class="doc_subsection">
Chris Lattner2b8a52e2008-02-10 07:46:44 +0000[diff] [blame]508<a name="optimizer">Optimizer Improvements</a>
509</div>
510
511<div class="doc_text">
512
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]513<p>In addition to a large array of minor performance tweaks and bug fixes, this
Chris Lattner25879d72008-10-13 21:50:36 +0000[diff] [blame]514release includes a few major enhancements and additions to the optimizers:</p>
Chris Lattner2b8a52e2008-02-10 07:46:44 +0000[diff] [blame]515
516<ul>
517
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]518<li>...</li>
Chris Lattnerd1094e02009-03-02 02:37:32 +0000[diff] [blame]519
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]520</ul>
Chris Lattnerd1094e02009-03-02 02:37:32 +0000[diff] [blame]521
Chris Lattner883b8682010-03-01 19:29:17 +0000[diff] [blame]522<p>Also, -anders-aa was removed</p>
523
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]524</div>
Chris Lattnerd1094e02009-03-02 02:37:32 +0000[diff] [blame]525
Chris Lattnerd1094e02009-03-02 02:37:32 +0000[diff] [blame]526
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]527<!--=========================================================================-->
528<div class="doc_subsection">
529<a name="executionengine">Interpreter and JIT Improvements</a>
530</div>
Chris Lattner25879d72008-10-13 21:50:36 +0000[diff] [blame]531
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]532<div class="doc_text">
533
534<ul>
Jeffrey Yasskin9fb8ce82010-01-29 19:10:38 +0000[diff] [blame]535<li>The JIT now <a
536href="http://llvm.org/viewvc/llvm-project?view=rev&revision=85295">defaults
537to compiling eagerly</a> to avoid a race condition in the lazy JIT.
538Clients that still want the lazy JIT can switch it on by calling
539<tt>ExecutionEngine::DisableLazyCompilation(false)</tt>.</li>
Jeffrey Yasskine0913882010-02-11 01:07:39 +0000[diff] [blame]540<li>It is now possible to create more than one JIT instance in the same process.
541These JITs can generate machine code in parallel,
542although <a href="http://llvm.org/docs/ProgrammersManual.html#jitthreading">you
543still have to obey the other threading restrictions</a>.</li>
Chris Lattner7795ea92008-06-08 02:45:07 +0000[diff] [blame]544</ul>
545
546</div>
547
548<!--=========================================================================-->
549<div class="doc_subsection">
Chris Lattnerd434bfb2009-03-02 03:24:11 +0000[diff] [blame]550<a name="codegen">Target Independent Code Generator Improvements</a>
Chris Lattner7795ea92008-06-08 02:45:07 +0000[diff] [blame]551</div>
552
553<div class="doc_text">
554
Mikhail Glushenkov25422542009-03-01 18:09:47 +0000[diff] [blame]555<p>We have put a significant amount of work into the code generator
556infrastructure, which allows us to implement more aggressive algorithms and make
557it run faster:</p>
Chris Lattner7795ea92008-06-08 02:45:07 +0000[diff] [blame]558
559<ul>
Chris Lattnerd434bfb2009-03-02 03:24:11 +0000[diff] [blame]560
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]561<li>...</li>
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]562</ul>
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]563</div>
564
Chris Lattnerd1094e02009-03-02 02:37:32 +0000[diff] [blame]565<!--=========================================================================-->
566<div class="doc_subsection">
567<a name="x86">X86-32 and X86-64 Target Improvements</a>
568</div>
569
570<div class="doc_text">
571<p>New features of the X86 target include:
572</p>
573
574<ul>
Chris Lattnerd434bfb2009-03-02 03:24:11 +0000[diff] [blame]575
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]576<li>...</li>
Chris Lattnerd434bfb2009-03-02 03:24:11 +0000[diff] [blame]577
Chris Lattnerd1094e02009-03-02 02:37:32 +0000[diff] [blame]578</ul>
579
Chris Lattnerd1094e02009-03-02 02:37:32 +0000[diff] [blame]580</div>
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]581
582<!--=========================================================================-->
583<div class="doc_subsection">
Chris Lattner6b8bf782009-02-26 07:32:11 +0000[diff] [blame]584<a name="pic16">PIC16 Target Improvements</a>
585</div>
586
587<div class="doc_text">
588<p>New features of the PIC16 target include:
589</p>
590
591<ul>
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]592<li>...</li>
Chris Lattner6b8bf782009-02-26 07:32:11 +0000[diff] [blame]593</ul>
594
595<p>Things not yet supported:</p>
596
597<ul>
Chris Lattner6b8bf782009-02-26 07:32:11 +0000[diff] [blame]598<li>Variable arguments.</li>
Chris Lattnerd434bfb2009-03-02 03:24:11 +0000[diff] [blame]599<li>Interrupts/programs.</li>
Chris Lattner6b8bf782009-02-26 07:32:11 +0000[diff] [blame]600</ul>
601
602</div>
603
Chris Lattner6b8bf782009-02-26 07:32:11 +0000[diff] [blame]604<!--=========================================================================-->
605<div class="doc_subsection">
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]606<a name="ARM">ARM Target Improvements</a>
Chris Lattnerc92d7692009-03-01 02:30:21 +0000[diff] [blame]607</div>
608
609<div class="doc_text">
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]610<p>New features of the ARM target include:
611</p>
Chris Lattnerc92d7692009-03-01 02:30:21 +0000[diff] [blame]612
613<ul>
Chris Lattnerc92d7692009-03-01 02:30:21 +0000[diff] [blame]614
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]615<li>...</li>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]616</ul>
Chris Lattnerc92d7692009-03-01 02:30:21 +0000[diff] [blame]617
Chris Lattnerc92d7692009-03-01 02:30:21 +0000[diff] [blame]618
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]619</div>
Chris Lattnerc92d7692009-03-01 02:30:21 +0000[diff] [blame]620
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]621<!--=========================================================================-->
622<div class="doc_subsection">
623<a name="OtherTarget">Other Target Specific Improvements</a>
624</div>
Chris Lattnerc92d7692009-03-01 02:30:21 +0000[diff] [blame]625
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]626<div class="doc_text">
627<p>New features of other targets include:
628</p>
629
630<ul>
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]631<li>...</li>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]632</ul>
633
634</div>
635
636<!--=========================================================================-->
637<div class="doc_subsection">
638<a name="newapis">New Useful APIs</a>
639</div>
640
641<div class="doc_text">
642
643<p>This release includes a number of new APIs that are used internally, which
644 may also be useful for external clients.
645</p>
646
647<ul>
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]648<li>...</li>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]649</ul>
650
651
652</div>
653
654<!--=========================================================================-->
655<div class="doc_subsection">
656<a name="otherimprovements">Other Improvements and New Features</a>
657</div>
658
659<div class="doc_text">
660<p>Other miscellaneous features include:</p>
661
662<ul>
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]663<li>...</li>
Chris Lattnerc92d7692009-03-01 02:30:21 +0000[diff] [blame]664</ul>
665
666</div>
667
Chris Lattner6cb64032008-06-05 08:02:49 +0000[diff] [blame]668
669<!--=========================================================================-->
670<div class="doc_subsection">
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]671<a name="changes">Major Changes and Removed Features</a>
672</div>
673
674<div class="doc_text">
675
Chris Lattner934e2d42008-10-13 22:06:31 +0000[diff] [blame]676<p>If you're already an LLVM user or developer with out-of-tree changes based
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]677on LLVM 2.6, this section lists some "gotchas" that you may run into upgrading
Chris Lattner934e2d42008-10-13 22:06:31 +0000[diff] [blame]678from the previous release.</p>
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]679
680<ul>
Jeffrey Yasskin914050b2010-02-09 23:03:44 +0000[diff] [blame]681<li>The LLVM interpreter now defaults to <em>not</em> using <tt>libffi</tt> even
682if you have it installed. This makes it more likely that an LLVM built on one
683system will work when copied to a similar system. To use <tt>libffi</tt>,
684configure with <tt>--enable-libffi</tt>.
685</li>
Chris Lattner934e2d42008-10-13 22:06:31 +0000[diff] [blame]686</ul>
687
688
689<p>In addition, many APIs have changed in this release. Some of the major LLVM
690API changes are:</p>
691
692<ul>
Jeffrey Yasskin4a8b1da2010-01-28 01:41:20 +0000[diff] [blame]693<li><tt>ModuleProvider</tt> has been <a
694href="http://llvm.org/viewvc/llvm-project?view=rev&revision=94686">removed</a>
695and its methods moved to <tt>Module</tt> and <tt>GlobalValue</tt>.
696Most clients can remove uses of <tt>ExistingModuleProvider</tt>,
697replace <tt>getBitcodeModuleProvider</tt> with
698<tt>getLazyBitcodeModule</tt>, and pass their <tt>Module</tt> to
699functions that used to accept <tt>ModuleProvider</tt>. Clients who
700wrote their own <tt>ModuleProvider</tt>s will need to derive from
701<tt>GVMaterializer</tt> instead and use
702<tt>Module::setMaterializer</tt> to attach it to a
703<tt>Module</tt>.</li>
704
705<li><tt>GhostLinkage</tt> has given up the ghost.
706<tt>GlobalValue</tt>s that have not yet been read from their backing
707storage have the same linkage they will have after being read in.
708Clients must replace calls to
709<tt>GlobalValue::hasNotBeenReadFromBitcode</tt> with
710<tt>GlobalValue::isMaterializable</tt>.</li>
Daniel Dunbar1e96fca2010-02-10 04:09:52 +0000[diff] [blame]711
712<li>FIXME: Debug info has been totally redone. Add pointers to new APIs. Substantial caveats about compatibility of .ll and .bc files.</li>
713
Daniel Dunbar3e255da2010-02-14 01:47:19 +0000[diff] [blame]714<li>The <tt>llvm/Support/DataTypes.h</tt> header has moved
715to <tt>llvm/System/DataTypes.h</tt>.</li>
716
Duncan Sands80c430a2010-02-17 17:20:17 +0000[diff] [blame]717<li>The <tt>isInteger</tt>, <tt>isIntOrIntVector</tt>, <tt>isFloatingPoint</tt>,
718<tt>isFPOrFPVector</tt> and <tt>isFPOrFPVector</tt> methods have been renamed
719<tt>isIntegerTy</tt>, <tt>isIntOrIntVectorTy</tt>, <tt>isFloatingPointTy</tt>,
720<tt>isFPOrFPVectorTy</tt> and <tt>isFPOrFPVectorTy</tt> respectively.</li>
Devang Pateldbf83832008-10-14 20:03:43 +0000[diff] [blame]721</ul>
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]722
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]723</div>
724
725
726
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]727<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]728<div class="doc_section">
729 <a name="portability">Portability and Supported Platforms</a>
730</div>
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]731<!-- *********************************************************************** -->
732
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]733<div class="doc_text">
734
John Criswell64307722004-12-08 20:35:47 +0000[diff] [blame]735<p>LLVM is known to work on the following platforms:</p>
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]736
737<ul>
Mikhail Glushenkov25422542009-03-01 18:09:47 +0000[diff] [blame]738<li>Intel and AMD machines (IA32, X86-64, AMD64, EMT-64) running Red Hat
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]739 Linux, Fedora Core, FreeBSD and AuroraUX (and probably other unix-like
740 systems).</li>
Mikhail Glushenkov25422542009-03-01 18:09:47 +0000[diff] [blame]741<li>PowerPC and X86-based Mac OS X systems, running 10.3 and above in 32-bit
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]742 and 64-bit modes.</li>
Chris Lattnercdc44ed2008-02-06 18:00:06 +0000[diff] [blame]743<li>Intel and AMD machines running on Win32 using MinGW libraries (native).</li>
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]744<li>Intel and AMD machines running on Win32 with the Cygwin libraries (limited
745 support is available for native builds with Visual C++).</li>
Chris Lattner51948622009-10-16 16:30:58 +0000[diff] [blame]746<li>Sun x86 and AMD64 machines running Solaris 10, OpenSolaris 0906.</li>
John Criswelld5234922005-05-13 20:28:15 +0000[diff] [blame]747<li>Alpha-based machines running Debian GNU/Linux.</li>
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]748</ul>
749
Chris Lattner618a99f2008-06-05 06:57:39 +0000[diff] [blame]750<p>The core LLVM infrastructure uses GNU autoconf to adapt itself
Brian Gaekee3e557e2004-05-09 05:28:35 +0000[diff] [blame]751to the machine and operating system on which it is built. However, minor
752porting may be required to get LLVM to work on new platforms. We welcome your
753portability patches and reports of successful builds or error messages.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]754
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]755</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]756
757<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]758<div class="doc_section">
759 <a name="knownproblems">Known Problems</a>
760</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]761<!-- *********************************************************************** -->
762
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]763<div class="doc_text">
764
Mikhail Glushenkov25422542009-03-01 18:09:47 +0000[diff] [blame]765<p>This section contains significant known problems with the LLVM system,
Chris Lattner2a092392008-11-10 05:40:34 +0000[diff] [blame]766listed by component. If you run into a problem, please check the <a
Chris Lattnera69595e2005-10-29 07:07:09 +0000[diff] [blame]767href="http://llvm.org/bugs/">LLVM bug database</a> and submit a bug if
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]768there isn't already one.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]769
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]770<ul>
771<li>The llvm-gcc bootstrap will fail with some versions of binutils (e.g. 2.15)
772 with a message of "<tt><a href="http://llvm.org/PR5004">Error: can not do 8
773 byte pc-relative relocation</a></tt>" when building C++ code. We intend to
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]774 fix this on mainline, but a workaround is to upgrade to binutils 2.17 or
775 later.</li>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]776
777<li>LLVM will not correctly compile on Solaris and/or OpenSolaris
778using the stock GCC 3.x.x series 'out the box',
Chris Lattner6e41c792009-11-03 21:50:09 +0000[diff] [blame]779See: <a href="GettingStarted.html#brokengcc">Broken versions of GCC and other tools</a>.
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]780However, A <a href="http://pkg.auroraux.org/GCC">Modern GCC Build</a>
781for x86/x86-64 has been made available from the third party AuroraUX Project
782that has been meticulously tested for bootstrapping LLVM &amp; Clang.</li>
783</ul>
784
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]785</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]786
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]787<!-- ======================================================================= -->
788<div class="doc_subsection">
789 <a name="experimental">Experimental features included with this release</a>
790</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]791
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]792<div class="doc_text">
793
Misha Brukmanfa50a222004-05-12 21:46:05 +0000[diff] [blame]794<p>The following components of this LLVM release are either untested, known to
795be broken or unreliable, or are in early development. These components should
796not be relied on, and bugs should not be filed against them, but they may be
797useful to some people. In particular, if you would like to work on one of these
Chris Lattnere38ac152008-02-12 06:29:45 +0000[diff] [blame]798components, please contact us on the <a
799href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVMdev list</a>.</p>
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]800
801<ul>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]802<li>The MSIL, Alpha, SPU, MIPS, PIC16, Blackfin, MSP430 and SystemZ backends are
803 experimental.</li>
Bill Wendling89cd82f2009-03-02 07:54:14 +0000[diff] [blame]804<li>The <tt>llc</tt> "<tt>-filetype=asm</tt>" (the default) is the only
Chris Lattner0b1c9a52010-03-17 04:41:49 +0000[diff] [blame]805 supported value for this option. The MachO writer is experimental, and
806 works much better in mainline SVN.</li>
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]807</ul>
808
809</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]810
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]811<!-- ======================================================================= -->
812<div class="doc_subsection">
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]813 <a name="x86-be">Known problems with the X86 back-end</a>
John Criswell3bdbd302005-11-08 21:11:33 +0000[diff] [blame]814</div>
815
816<div class="doc_text">
817
818<ul>
Anton Korobeynikov486c7d32008-06-08 10:24:13 +0000[diff] [blame]819 <li>The X86 backend does not yet support
820 all <a href="http://llvm.org/PR879">inline assembly that uses the X86
821 floating point stack</a>. It supports the 'f' and 't' constraints, but not
822 'u'.</li>
Chris Lattnerb076b002008-06-08 21:19:07 +0000[diff] [blame]823 <li>The X86 backend generates inefficient floating point code when configured
824 to generate code for systems that don't have SSE2.</li>
Duncan Sands0bc15262008-06-08 19:38:43 +0000[diff] [blame]825 <li>Win64 code generation wasn't widely tested. Everything should work, but we
John Criswellea03c9d2009-03-02 15:28:15 +0000[diff] [blame]826 expect small issues to happen. Also, llvm-gcc cannot build the mingw64
827 runtime currently due
Anton Korobeynikov486c7d32008-06-08 10:24:13 +0000[diff] [blame]828 to <a href="http://llvm.org/PR2255">several</a>
John Criswellea03c9d2009-03-02 15:28:15 +0000[diff] [blame]829 <a href="http://llvm.org/PR2257">bugs</a> and due to lack of support for
830 the
831 'u' inline assembly constraint and for X87 floating point inline assembly.</li>
Dan Gohman721b3722008-06-08 23:05:11 +0000[diff] [blame]832 <li>The X86-64 backend does not yet support the LLVM IR instruction
Chris Lattnerd1094e02009-03-02 02:37:32 +0000[diff] [blame]833 <tt>va_arg</tt>. Currently, the llvm-gcc and front-ends support variadic
Dan Gohman721b3722008-06-08 23:05:11 +0000[diff] [blame]834 argument constructs on X86-64 by lowering them manually.</li>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]835</ul>
836
837</div>
838
839<!-- ======================================================================= -->
840<div class="doc_subsection">
841 <a name="ppc-be">Known problems with the PowerPC back-end</a>
842</div>
843
844<div class="doc_text">
845
846<ul>
Nicolas Geoffray77d99502007-05-15 09:21:28 +0000[diff] [blame]847<li>The Linux PPC32/ABI support needs testing for the interpreter and static
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]848compilation, and lacks support for debug information.</li>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]849</ul>
850
851</div>
852
853<!-- ======================================================================= -->
854<div class="doc_subsection">
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]855 <a name="arm-be">Known problems with the ARM back-end</a>
856</div>
857
858<div class="doc_text">
859
860<ul>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]861<li>Support for the Advanced SIMD (Neon) instruction set is still incomplete
862and not well tested. Some features may not work at all, and the code quality
863may be poor in some cases.</li>
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]864<li>Thumb mode works only on ARMv6 or higher processors. On sub-ARMv6
Duncan Sands47fc0a22007-09-26 15:59:54 +0000[diff] [blame]865processors, thumb programs can crash or produce wrong
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]866results (<a href="http://llvm.org/PR1388">PR1388</a>).</li>
John Criswellea03c9d2009-03-02 15:28:15 +0000[diff] [blame]867<li>Compilation for ARM Linux OABI (old ABI) is supported but not fully tested.
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]868</li>
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]869</ul>
870
871</div>
872
873<!-- ======================================================================= -->
874<div class="doc_subsection">
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]875 <a name="sparc-be">Known problems with the SPARC back-end</a>
876</div>
877
878<div class="doc_text">
879
880<ul>
John Criswellea03c9d2009-03-02 15:28:15 +0000[diff] [blame]881<li>The SPARC backend only supports the 32-bit SPARC ABI (-m32); it does not
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]882 support the 64-bit SPARC ABI (-m64).</li>
883</ul>
884
885</div>
886
887<!-- ======================================================================= -->
888<div class="doc_subsection">
Bruno Cardoso Lopes24eb3de2008-10-25 14:56:26 +0000[diff] [blame]889 <a name="mips-be">Known problems with the MIPS back-end</a>
890</div>
891
892<div class="doc_text">
893
894<ul>
Bruno Cardoso Lopes24eb3de2008-10-25 14:56:26 +0000[diff] [blame]895<li>64-bit MIPS targets are not supported yet.</li>
896</ul>
897
898</div>
899
900<!-- ======================================================================= -->
901<div class="doc_subsection">
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]902 <a name="alpha-be">Known problems with the Alpha back-end</a>
903</div>
904
905<div class="doc_text">
906
907<ul>
908
909<li>On 21164s, some rare FP arithmetic sequences which may trap do not have the
910appropriate nops inserted to ensure restartability.</li>
911
John Criswell3bdbd302005-11-08 21:11:33 +0000[diff] [blame]912</ul>
913</div>
914
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]915<!-- ======================================================================= -->
916<div class="doc_subsection">
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]917 <a name="c-be">Known problems with the C back-end</a>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]918</div>
919
920<div class="doc_text">
921
922<ul>
Chris Lattnera1a4c9a2008-06-05 06:35:40 +0000[diff] [blame]923<li><a href="http://llvm.org/PR802">The C backend has only basic support for
924 inline assembly code</a>.</li>
Chris Lattner8e061162007-09-26 06:01:35 +0000[diff] [blame]925<li><a href="http://llvm.org/PR1658">The C backend violates the ABI of common
926 C++ programs</a>, preventing intermixing between C++ compiled by the CBE and
Gabor Greif75b2f762009-03-02 12:02:51 +0000[diff] [blame]927 C++ code compiled with <tt>llc</tt> or native compilers.</li>
Duncan Sandse09506a2008-02-10 13:40:55 +0000[diff] [blame]928<li>The C backend does not support all exception handling constructs.</li>
Duncan Sands3aa36732009-02-25 11:51:54 +0000[diff] [blame]929<li>The C backend does not support arbitrary precision integers.</li>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]930</ul>
931
932</div>
John Criswell3bdbd302005-11-08 21:11:33 +0000[diff] [blame]933
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]934
935<!-- ======================================================================= -->
936<div class="doc_subsection">
Chris Lattner0b1c9a52010-03-17 04:41:49 +0000[diff] [blame]937 <a name="c-fe">Known problems with the llvm-gcc C and C++ front-end</a>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]938</div>
Chris Lattner178f3db2003-10-02 05:07:23 +0000[diff] [blame]939
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]940<div class="doc_text">
Chris Lattner72a269f2006-03-03 00:34:26 +0000[diff] [blame]941
Chris Lattnera1a4c9a2008-06-05 06:35:40 +0000[diff] [blame]942<p>The only major language feature of GCC not supported by llvm-gcc is
943 the <tt>__builtin_apply</tt> family of builtins. However, some extensions
944 are only supported on some targets. For example, trampolines are only
Duncan Sands56448462008-06-08 20:18:35 +0000[diff] [blame]945 supported on some targets (these are used when you take the address of a
946 nested function).</p>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]947
Chris Lattnera1a4c9a2008-06-05 06:35:40 +0000[diff] [blame]948<p>If you run into GCC extensions which are not supported, please let us know.
949</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]950
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]951</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]952
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]953<!-- ======================================================================= -->
954<div class="doc_subsection">
Chris Lattner7292fb12008-10-30 03:58:13 +0000[diff] [blame]955 <a name="fortran-fe">Known problems with the llvm-gcc Fortran front-end</a>
956</div>
957
958<div class="doc_text">
Gabor Greife5f9d672008-11-04 21:50:59 +0000[diff] [blame]959<ul>
Chris Lattner7292fb12008-10-30 03:58:13 +0000[diff] [blame]960<li>Fortran support generally works, but there are still several unresolved bugs
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]961 in <a href="http://llvm.org/bugs/">Bugzilla</a>. Please see the
962 tools/gfortran component for details.</li>
Gabor Greife5f9d672008-11-04 21:50:59 +0000[diff] [blame]963</ul>
Chris Lattner7292fb12008-10-30 03:58:13 +0000[diff] [blame]964</div>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]965
Chris Lattnere38ac152008-02-12 06:29:45 +0000[diff] [blame]966<!-- ======================================================================= -->
967<div class="doc_subsection">
Chris Lattnera1a4c9a2008-06-05 06:35:40 +0000[diff] [blame]968 <a name="ada-fe">Known problems with the llvm-gcc Ada front-end</a>
Chris Lattnere38ac152008-02-12 06:29:45 +0000[diff] [blame]969</div>
970
971<div class="doc_text">
John Criswellea03c9d2009-03-02 15:28:15 +0000[diff] [blame]972The llvm-gcc 4.2 Ada compiler works fairly well; however, this is not a mature
973technology, and problems should be expected.
Chris Lattnere38ac152008-02-12 06:29:45 +0000[diff] [blame]974<ul>
Duncan Sands56448462008-06-08 20:18:35 +0000[diff] [blame]975<li>The Ada front-end currently only builds on X86-32. This is mainly due
John Criswellea03c9d2009-03-02 15:28:15 +0000[diff] [blame]976to lack of trampoline support (pointers to nested functions) on other platforms.
977However, it <a href="http://llvm.org/PR2006">also fails to build on X86-64</a>
Chris Lattnere38ac152008-02-12 06:29:45 +0000[diff] [blame]978which does support trampolines.</li>
979<li>The Ada front-end <a href="http://llvm.org/PR2007">fails to bootstrap</a>.
Duncan Sandsd34bf762009-02-25 11:59:06 +0000[diff] [blame]980This is due to lack of LLVM support for <tt>setjmp</tt>/<tt>longjmp</tt> style
981exception handling, which is used internally by the compiler.
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]982Workaround: configure with <tt>--disable-bootstrap</tt>.</li>
Duncan Sandsaef747f2008-10-13 17:27:23 +0000[diff] [blame]983<li>The c380004, <a href="http://llvm.org/PR2010">c393010</a>
984and <a href="http://llvm.org/PR2421">cxg2021</a> ACATS tests fail
Duncan Sandsd34bf762009-02-25 11:59:06 +0000[diff] [blame]985(c380004 also fails with gcc-4.2 mainline).
986If the compiler is built with checks disabled then <a href="http://llvm.org/PR2010">c393010</a>
987causes the compiler to go into an infinite loop, using up all system memory.</li>
Duncan Sands2dbb00e2009-03-02 16:35:57 +0000[diff] [blame]988<li>Some GCC specific Ada tests continue to crash the compiler.</li>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]989<li>The <tt>-E</tt> binder option (exception backtraces)
Chris Lattnere38ac152008-02-12 06:29:45 +0000[diff] [blame]990<a href="http://llvm.org/PR1982">does not work</a> and will result in programs
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]991crashing if an exception is raised. Workaround: do not use <tt>-E</tt>.</li>
Chris Lattnere38ac152008-02-12 06:29:45 +0000[diff] [blame]992<li>Only discrete types <a href="http://llvm.org/PR1981">are allowed to start
993or finish at a non-byte offset</a> in a record. Workaround: do not pack records
994or use representation clauses that result in a field of a non-discrete type
995starting or finishing in the middle of a byte.</li>
Chris Lattnerb076b002008-06-08 21:19:07 +0000[diff] [blame]996<li>The <tt>lli</tt> interpreter <a href="http://llvm.org/PR2009">considers
997'main' as generated by the Ada binder to be invalid</a>.
998Workaround: hand edit the file to use pointers for <tt>argv</tt> and
999<tt>envp</tt> rather than integers.</li>
1000<li>The <tt>-fstack-check</tt> option <a href="http://llvm.org/PR2008">is
1001ignored</a>.</li>
Chris Lattnere38ac152008-02-12 06:29:45 +0000[diff] [blame]1002</ul>
1003</div>
1004
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]1005<!-- ======================================================================= -->
1006<div class="doc_subsection">
1007 <a name="ocaml-bindings">Known problems with the O'Caml bindings</a>
1008</div>
1009
1010<div class="doc_text">
1011
1012<p>The <tt>Llvm.Linkage</tt> module is broken, and has incorrect values. Only
1013<tt>Llvm.Linkage.External</tt>, <tt>Llvm.Linkage.Available_externally</tt>, and
1014<tt>Llvm.Linkage.Link_once</tt> will be correct. If you need any of the other linkage
1015modes, you'll have to write an external C library in order to expose the
1016functionality. This has been fixed in the trunk.</p>
1017</div>
1018
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]1019<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]1020<div class="doc_section">
1021 <a name="additionalinfo">Additional Information</a>
1022</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]1023<!-- *********************************************************************** -->
1024
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]1025<div class="doc_text">
1026
Chris Lattnercb5596d2005-05-16 17:13:10 +0000[diff] [blame]1027<p>A wide variety of additional information is available on the <a
Chris Lattnere0c1df42007-05-18 00:44:29 +0000[diff] [blame]1028href="http://llvm.org">LLVM web page</a>, in particular in the <a
1029href="http://llvm.org/docs/">documentation</a> section. The web page also
Reid Spencerc7f87f22007-07-09 08:04:31 +0000[diff] [blame]1030contains versions of the API documentation which is up-to-date with the
1031Subversion version of the source code.
Misha Brukman96158092005-03-30 19:14:24 +0000[diff] [blame]1032You can access versions of these documents specific to this release by going
1033into the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]1034
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]1035<p>If you have any questions or comments about LLVM, please feel free to contact
Chris Lattnera69595e2005-10-29 07:07:09 +0000[diff] [blame]1036us via the <a href="http://llvm.org/docs/#maillist"> mailing
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]1037lists</a>.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]1038
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]1039</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]1040
1041<!-- *********************************************************************** -->
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]1042
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]1043<hr>
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]1044<address>
Misha Brukman8834af92003-12-21 22:53:21 +0000[diff] [blame]1045 <a href="http://jigsaw.w3.org/css-validator/check/referer"><img
Misha Brukman86242e12008-12-11 17:34:48 +0000[diff] [blame]1046 src="http://jigsaw.w3.org/css-validator/images/vcss-blue" alt="Valid CSS"></a>
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]1047 <a href="http://validator.w3.org/check/referer"><img
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