Gitiles
Code Review Sign In
gerrit-public.fairphone.software / toolchain / llvm-project / fe29117f6c7af685db974a698cdf20b741cb8a59 / . / llvm / docs / ReleaseNotes.html
blob: c6b946504fafc0d9623b47f5029cbfdae97c398c [file] [log] [blame]
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
Chris Lattner06971182010-04-13 06:37:00 +0000[diff] [blame]31<!--
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]32<h1 style="color:red">These are in-progress notes for the upcoming LLVM 2.7
33release.<br>
34You may prefer the
35<a href="http://llvm.org/releases/2.6/docs/ReleaseNotes.html">LLVM 2.6
Chris Lattner06971182010-04-13 06:37:00 +0000[diff] [blame]36Release Notes</a>.</h1>-->
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]37
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]38<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]39<div class="doc_section">
40 <a name="intro">Introduction</a>
41</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]42<!-- *********************************************************************** -->
43
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]44<div class="doc_text">
45
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]46<p>This document contains the release notes for the LLVM Compiler
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]47Infrastructure, release 2.7. Here we describe the status of LLVM, including
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]48major improvements from the previous release and significant known problems.
Mikhail Glushenkov25422542009-03-01 18:09:47 +0000[diff] [blame]49All LLVM releases may be downloaded from the <a
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]50href="http://llvm.org/releases/">LLVM releases web site</a>.</p>
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]51
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]52<p>For more information about LLVM, including information about the latest
Chris Lattnera69595e2005-10-29 07:07:09 +0000[diff] [blame]53release, please check out the <a href="http://llvm.org/">main LLVM
Chris Lattnere7525b52003-10-07 21:38:31 +0000[diff] [blame]54web site</a>. If you have questions or comments, the <a
Chris Lattner0b1c9a52010-03-17 04:41:49 +0000[diff] [blame]55href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVM Developer's
56Mailing List</a> is a good place to send them.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]57
Mikhail Glushenkov024f7cf2008-10-13 02:08:34 +0000[diff] [blame]58<p>Note that if you are reading this file from a Subversion checkout or the
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]59main LLVM web page, this document applies to the <i>next</i> release, not the
Gabor Greif355f81c2008-10-14 11:00:32 +0000[diff] [blame]60current one. To see the release notes for a specific release, please see the
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]61<a href="http://llvm.org/releases/">releases page</a>.</p>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]62
63</div>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]64
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]65
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]66<!--
67Almost dead code.
68 include/llvm/Analysis/LiveValues.h => Dan
69 lib/Transforms/IPO/MergeFunctions.cpp => consider for 2.8.
70 llvm/Analysis/PointerTracking.h => Edwin wants this, consider for 2.8.
Chris Lattner06971182010-04-13 06:37:00 +0000[diff] [blame]71 ABCD, GEPSplitterPass
Chris Lattner89ea59d2010-01-16 21:25:13 +0000[diff] [blame]72 MSIL backend?
Chris Lattner10a3cc42010-03-17 06:41:58 +0000[diff] [blame]73 lib/Transforms/Utils/SSI.cpp -> ABCD depends on it.
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]74-->
75
76
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]77<!-- Features that need text if they're finished for 2.7:
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]78 strong phi elim
Chris Lattner87e04952010-04-21 05:17:40 +0000[diff] [blame]79 llvm.dbg.value: variable debug info for optimized code
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]80 loop dependence analysis
Chris Lattner2b8a52e2008-02-10 07:46:44 +0000[diff] [blame]81 -->
Mikhail Glushenkov024f7cf2008-10-13 02:08:34 +0000[diff] [blame]82
Chris Lattnerc4d68542008-10-12 19:47:48 +0000[diff] [blame]83 <!-- for announcement email:
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]84 Logo web page.
85 llvm devmtg
86 compiler_rt
87 KLEE web page at klee.llvm.org
88 Many new papers added to /pubs/
Chris Lattner10a3cc42010-03-17 06:41:58 +0000[diff] [blame]89 Mention gcc plugin.
Chris Lattnerd02da042009-02-25 06:34:50 +0000[diff] [blame]90 -->
Chris Lattner2b8a52e2008-02-10 07:46:44 +0000[diff] [blame]91
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]92<!-- *********************************************************************** -->
93<div class="doc_section">
94 <a name="subproj">Sub-project Status Update</a>
Chris Lattner625a3d82008-06-08 21:34:41 +0000[diff] [blame]95</div>
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]96<!-- *********************************************************************** -->
Chris Lattner625a3d82008-06-08 21:34:41 +0000[diff] [blame]97
98<div class="doc_text">
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]99<p>
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]100The LLVM 2.7 distribution currently consists of code from the core LLVM
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]101repository (which roughly includes the LLVM optimizers, code generators
102and supporting tools), the Clang repository and the llvm-gcc repository. In
103addition to this code, the LLVM Project includes other sub-projects that are in
104development. Here we include updates on these subprojects.
Bill Wendlingf170d2e2009-03-02 04:28:57 +0000[diff] [blame]105</p>
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]106
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]107</div>
108
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]109
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]110<!--=========================================================================-->
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]111<div class="doc_subsection">
Chris Lattner44c09cd2008-10-13 18:11:54 +0000[diff] [blame]112<a name="clang">Clang: C/C++/Objective-C Frontend Toolkit</a>
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]113</div>
114
115<div class="doc_text">
116
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]117<p>The <a href="http://clang.llvm.org/">Clang project</a> is ...</p>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]118
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]119<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]120
Daniel Dunbarc11b40f2008-10-14 23:25:09 +0000[diff] [blame]121<ul>
Daniel Dunbareb4bc7f2010-03-25 16:09:18 +0000[diff] [blame]122<li>FIXME: C++! Include a link to cxx_compatibility.html</li>
123
124<li>FIXME: Static Analyzer improvements?</li>
125
126<li>CIndex API and Python bindings: Clang now includes a C API as part of the
127CIndex library. Although we make make some changes to the API in the future, it
128is intended to be stable and has been designed for use by external projects. See
129the Clang
130doxygen <a href="http://clang.llvm.org/doxygen/group__CINDEX.html">CIndex</a>
131documentation for more details. The CIndex API also includings an preliminary
132set of Python bindings.</li>
133
134<li>ARM Support: Clang now has ABI support for both the Darwin and Linux ARM
135ABIs. Coupled with many improvements to the LLVM ARM backend, Clang is now
136suitable for use as a a beta quality ARM compiler.</li>
Bill Wendling87adbe42009-03-02 04:28:18 +0000[diff] [blame]137</ul>
Chris Lattner44c09cd2008-10-13 18:11:54 +0000[diff] [blame]138</div>
139
140<!--=========================================================================-->
141<div class="doc_subsection">
142<a name="clangsa">Clang Static Analyzer</a>
143</div>
144
145<div class="doc_text">
146
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]147<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]148includes an early stage static source code analysis tool for <a
149href="http://clang.llvm.org/StaticAnalysis.html">automatically finding bugs</a>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]150in C and Objective-C programs. The tool performs checks to find
Ted Kremenekc11fae82009-02-27 07:01:32 +0000[diff] [blame]151bugs that occur on a specific path within a program.</p>
Chris Lattnerbcffa5a2008-10-14 00:52:49 +0000[diff] [blame]152
Chris Lattnerc871bac2010-03-17 04:02:39 +0000[diff] [blame]153<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]154
155</div>
156
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]157<!--=========================================================================-->
158<div class="doc_subsection">
Nicolas Geoffraye5ec9322008-10-14 19:23:04 +0000[diff] [blame]159<a name="vmkit">VMKit: JVM/CLI Virtual Machine Implementation</a>
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]160</div>
161
162<div class="doc_text">
163<p>
Nicolas Geoffraye5ec9322008-10-14 19:23:04 +0000[diff] [blame]164The <a href="http://vmkit.llvm.org/">VMKit project</a> is an implementation of
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]165a JVM and a CLI Virtual Machine (Microsoft .NET is an
166implementation of the CLI) using LLVM for static and just-in-time
167compilation.</p>
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]168
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]169<p>
Chris Lattneref2e5732010-03-29 18:34:13 +0000[diff] [blame]170With the release of LLVM 2.7, VMKit has shifted to a great framework for writing
171virtual machines. VMKit now offers precise and efficient garbage collection with
172multi-threading support, thanks to the MMTk memory management toolkit, as well
173as just in time and ahead of time compilation with LLVM. The major changes in
174VMKit 0.27 are:</p>
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]175
Nicolas Geoffraye5ec9322008-10-14 19:23:04 +0000[diff] [blame]176<ul>
177
Chris Lattneref2e5732010-03-29 18:34:13 +0000[diff] [blame]178<li>Garbage collection: VMKit now uses the MMTk toolkit for garbage collectors.
179 The first collector to be ported is the MarkSweep collector, which is precise,
180 and drastically improves the performance of VMKit.</li>
181<li>Line number information in the JVM: by using the debug metadata of LLVM, the
182 JVM now supports precise line number information, useful when printing a stack
183 trace.</li>
184<li>Interface calls in the JVM: we implemented a variant of the Interface Method
185 Table technique for interface calls in the JVM.
186</li>
Nicolas Geoffraye5ec9322008-10-14 19:23:04 +0000[diff] [blame]187
188</ul>
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]189</div>
190
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]191
192<!--=========================================================================-->
193<div class="doc_subsection">
194<a name="compiler-rt">compiler-rt: Compiler Runtime Library</a>
195</div>
196
197<div class="doc_text">
198<p>
199The new LLVM <a href="http://compiler-rt.llvm.org/">compiler-rt project</a>
200is a simple library that provides an implementation of the low-level
201target-specific hooks required by code generation and other runtime components.
202For example, when compiling for a 32-bit target, converting a double to a 64-bit
203unsigned integer is compiled into a runtime call to the "__fixunsdfdi"
204function. The compiler-rt library provides highly optimized implementations of
205this and other low-level routines (some are 3x faster than the equivalent
206libgcc routines).</p>
207
208<p>
209All of the code in the compiler-rt project is available under the standard LLVM
Chris Lattner87e04952010-04-21 05:17:40 +0000[diff] [blame]210License, a "BSD-style" license. New in LLVM 2.7: compiler_rt now
211supports ARM targets.</p>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]212
213</div>
214
215<!--=========================================================================-->
216<div class="doc_subsection">
Duncan Sands92452b92010-04-02 09:23:15 +0000[diff] [blame]217<a name="dragonegg">DragonEgg: llvm-gcc ported to gcc-4.5</a>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]218</div>
219
220<div class="doc_text">
221<p>
Duncan Sands92452b92010-04-02 09:23:15 +0000[diff] [blame]222<a href="http://dragonegg.llvm.org/">DragonEgg</a> is a port of llvm-gcc to
223gcc-4.5. Unlike llvm-gcc, which makes many intrusive changes to the underlying
224gcc-4.2 code, dragonegg in theory does not require any gcc-4.5 modifications
225whatsoever (currently one small patch is needed). This is thanks to the new
226<a href="http://gcc.gnu.org/wiki/plugins">gcc plugin architecture</a>, which
227makes it possible to modify the behaviour of gcc at runtime by loading a plugin,
228which is nothing more than a dynamic library which conforms to the gcc plugin
229interface. DragonEgg is a gcc plugin that causes the LLVM optimizers to be run
230instead of the gcc optimizers, and the LLVM code generators instead of the gcc
231code generators, just like llvm-gcc. To use it, you add
232"-fplugin=path/dragonegg.so" to the gcc-4.5 command line, and gcc-4.5 magically
233becomes llvm-gcc-4.5!
234</p>
235
236<p>
237DragonEgg is still a work in progress. Currently C works very well, while C++,
238Ada and Fortran work fairly well. All other languages either don't work at all,
239or only work poorly. For the moment only the x86-32 and x86-64 targets are
Duncan Sands4dd125e2010-04-20 19:40:58 +0000[diff] [blame]240supported, and only on linux and darwin (darwin needs an additional gcc patch).
Duncan Sands92452b92010-04-02 09:23:15 +0000[diff] [blame]241</p>
242
243<p>
Duncan Sandsfe291172010-04-21 13:51:48 +0000[diff] [blame^]244DragonEgg is a new project which is seeing its first release with llvm-2.7.
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]245</p>
246
247</div>
248
249
250<!--=========================================================================-->
251<div class="doc_subsection">
252<a name="mc">llvm-mc: Machine Code Toolkit</a>
253</div>
254
255<div class="doc_text">
256<p>
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]257The LLVM Machine Code (MC) Toolkit project is ...
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]258</p>
259
Chris Lattner1dcca8b2010-04-21 06:23:40 +0000[diff] [blame]260<p>
261MC Disassembler (with blog post), MCInstPrinter. Many X86 backend and AsmPrinter simplifications
262Can transcode from GAS to intel syntax with "llvm-mc foo.s -output-asm-variant=1"
263</p>
264
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]265</div>
266
267
Chris Lattner53e06f92009-02-26 22:33:38 +0000[diff] [blame]268<!-- *********************************************************************** -->
269<div class="doc_section">
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]270 <a name="externalproj">External Open Source Projects Using LLVM 2.7</a>
Chris Lattner53e06f92009-02-26 22:33:38 +0000[diff] [blame]271</div>
272<!-- *********************************************************************** -->
273
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]274<div class="doc_text">
275
276<p>An exciting aspect of LLVM is that it is used as an enabling technology for
277 a lot of other language and tools projects. This section lists some of the
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]278 projects that have already been updated to work with LLVM 2.7.</p>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]279</div>
280
Chris Lattner53e06f92009-02-26 22:33:38 +0000[diff] [blame]281<!--=========================================================================-->
282<div class="doc_subsection">
283<a name="pure">Pure</a>
284</div>
285
286<div class="doc_text">
287<p>
Chris Lattnerd1094e02009-03-02 02:37:32 +0000[diff] [blame]288<a href="http://pure-lang.googlecode.com/">Pure</a>
289is an algebraic/functional programming language based on term rewriting.
Chris Lattner53e06f92009-02-26 22:33:38 +0000[diff] [blame]290Programs are collections of equations which are used to evaluate expressions in
291a symbolic fashion. Pure offers dynamic typing, eager and lazy evaluation,
Mikhail Glushenkov25422542009-03-01 18:09:47 +0000[diff] [blame]292lexical closures, a hygienic macro system (also based on term rewriting),
Chris Lattner53e06f92009-02-26 22:33:38 +0000[diff] [blame]293built-in list and matrix support (including list and matrix comprehensions) and
294an easy-to-use C interface. The interpreter uses LLVM as a backend to
295 JIT-compile Pure programs to fast native code.</p>
296
Chris Lattner6aba4862010-03-17 17:25:49 +0000[diff] [blame]297<p>Pure versions 0.43 and later have been tested and are known to work with
298LLVM 2.7 (and continue to work with older LLVM releases >= 2.5).</p>
299
Chris Lattner53e06f92009-02-26 22:33:38 +0000[diff] [blame]300</div>
301
Chris Lattnerfb23a962009-02-28 18:58:01 +0000[diff] [blame]302<!--=========================================================================-->
303<div class="doc_subsection">
304<a name="RoadsendPHP">Roadsend PHP</a>
305</div>
306
307<div class="doc_text">
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]308<p>
309<a href="http://code.roadsend.com/rphp">Roadsend PHP</a> (rphp) is an open
Chris Lattner0c72d8f2009-03-02 19:07:24 +0000[diff] [blame]310source implementation of the PHP programming
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]311language that uses LLVM for its optimizer, JIT and static compiler. This is a
Chris Lattnerc871bac2010-03-17 04:02:39 +0000[diff] [blame]312reimplementation of an earlier project that is now based on LLVM.
Chris Lattner6aba4862010-03-17 17:25:49 +0000[diff] [blame]313</p>
Chris Lattnerfb23a962009-02-28 18:58:01 +0000[diff] [blame]314</div>
Chris Lattner53e06f92009-02-26 22:33:38 +0000[diff] [blame]315
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]316<!--=========================================================================-->
317<div class="doc_subsection">
318<a name="UnladenSwallow">Unladen Swallow</a>
319</div>
320
321<div class="doc_text">
322<p>
323<a href="http://code.google.com/p/unladen-swallow/">Unladen Swallow</a> is a
324branch of <a href="http://python.org/">Python</a> intended to be fully
325compatible and significantly faster. It uses LLVM's optimization passes and JIT
Chris Lattner5b59a732010-03-18 06:52:15 +0000[diff] [blame]326compiler.
Chris Lattnerc871bac2010-03-17 04:02:39 +0000[diff] [blame]327</p>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]328</div>
329
330<!--=========================================================================-->
331<div class="doc_subsection">
Chris Lattnerb4a02792010-03-29 17:50:39 +0000[diff] [blame]332<a name="tce">TTA-based Codesign Environment (TCE)</a>
333</div>
334
335<div class="doc_text">
336<p>
337<a href="http://tce.cs.tut.fi/">TCE</a> is a toolset for designing
338application-specific processors (ASP) based on the Transport triggered
339architecture (TTA). The toolset provides a complete co-design flow from C/C++
340programs down to synthesizable VHDL and parallel program binaries. Processor
341customization points include the register files, function units, supported
342operations, and the interconnection network.</p>
343
344<p>TCE uses llvm-gcc/Clang and LLVM for C/C++ language support, target
345independent optimizations and also for parts of code generation. It generates
346new LLVM-based code generators "on the fly" for the designed TTA processors and
347loads them in to the compiler backend as runtime libraries to avoid per-target
348recompilation of larger parts of the compiler chain.</p>
349
350</div>
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]351
John Criswell9003e0f2010-04-06 14:52:14 +0000[diff] [blame]352<!--=========================================================================-->
353<div class="doc_subsection">
354<a name="safecode">SAFECode Compiler</a>
355</div>
356
357<div class="doc_text">
358<p>
359<a href="http://safecode.cs.illinois.edu">SAFECode</a> is a memory safe C
360compiler built using LLVM. It takes standard, unannotated C code, analyzes the
361code to ensure that memory accesses and array indexing operations are safe, and
362instruments the code with run-time checks when safety cannot be proven
363statically.
364</p>
365</div>
366
367
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]368<!-- *********************************************************************** -->
369<div class="doc_section">
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]370 <a name="whatsnew">What's New in LLVM 2.7?</a>
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]371</div>
372<!-- *********************************************************************** -->
373
Chris Lattnerb7bc2aa2008-06-08 22:59:35 +0000[diff] [blame]374<div class="doc_text">
375
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]376<p>This release includes a huge number of bug fixes, performance tweaks and
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]377minor improvements. Some of the major improvements and new features are listed
378in this section.
Chris Lattnerb7bc2aa2008-06-08 22:59:35 +0000[diff] [blame]379</p>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]380
Chris Lattner87e04952010-04-21 05:17:40 +0000[diff] [blame]381<p>In addition to changes to the code, between LLVM 2.6 and 2.7, a number of
382organization changes have happened:
383</p>
384
385<ul>
386<li>LLVM has a new <a href="http://llvm.org/Logo.html">official Logo</a>!</li>
387
Chris Lattner87e04952010-04-21 05:17:40 +0000[diff] [blame]388<li>Ted Kremenek and Doug Gregor have stepped forward as <a
389 href="http://llvm.org/docs/DeveloperPolicy.html#owners">Code Owners</a> of the
390 Clang static analyzer and the Clang Frontend, respectively.</li>
Chris Lattner1dcca8b2010-04-21 06:23:40 +0000[diff] [blame]391
392<li>LLVM now has an <a href="http://blog.llvm.org">official Blog</a> at
393 <a href="http://blog.llvm.org">http://blog.llvm.org</a>. This is a great way
394 to learn about new LLVM-related features as they are implemented. Several
395 features in this release are already explained on the blog.</li>
396
Chris Lattner87e04952010-04-21 05:17:40 +0000[diff] [blame]397<li>The LLVM web pages are now checked into the SVN server, in the "www",
398 "www-pubs" and "www-releases" SVN modules. Previously they were hidden in a
399 largely inaccessible old CVS server.</p>
Chris Lattner1dcca8b2010-04-21 06:23:40 +0000[diff] [blame]400
401<li><a href="http://llvm.org">llvm.org</a> is now hosted on a new (and much
402 faster) server. It is still graciously hosted at the University of Illinois
403 of Urbana Champaign.</li>
Chris Lattner87e04952010-04-21 05:17:40 +0000[diff] [blame]404</ul>
Chris Lattnerb7bc2aa2008-06-08 22:59:35 +0000[diff] [blame]405</div>
406
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]407<!--=========================================================================-->
Chris Lattner625a3d82008-06-08 21:34:41 +0000[diff] [blame]408<div class="doc_subsection">
Chris Lattnercdc44ed2008-02-06 18:00:06 +0000[diff] [blame]409<a name="majorfeatures">Major New Features</a>
410</div>
411
412<div class="doc_text">
413
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]414<p>LLVM 2.7 includes several major new capabilities:</p>
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]415
416<ul>
Chris Lattner1dcca8b2010-04-21 06:23:40 +0000[diff] [blame]417<li>This release includes initial support for the <a
418 href="http://en.wikipedia.org/wiki/MicroBlaze">MicroBlaze</a> target.
419 MicroBlaze is a soft processor core designed for Xilinx FPGAs.</li>
Chris Lattner87e04952010-04-21 05:17:40 +0000[diff] [blame]420
Chris Lattner1dcca8b2010-04-21 06:23:40 +0000[diff] [blame]421<li>LLVM 2.7 includes a new LLVM IR "extensible metadata" feature. This feature
422 supports many different use cases, including allowing front-end authors to
423 encode source level information into LLVM IR, which is consumed by later
424 language-specific passes. This is a great way to do high-level optimizations
425 like devirtualization, type-based alias analysis, etc. See the <a
426 href="http://blog.llvm.org/2010/04/extensible-metadata-in-llvm-ir.html">
427 Extensible Metadata Blog Post</a> for more information.</li>
428
429<li>LLVM 2.7 encodes <a href="SourceLevelDebugging.html">debug information</a>
430in a completely new way, built on extensible metadata. The new implementation
431is much more memory efficient and paves the way for improvements to optimized
432code debugging experience.</li>
Chris Lattner87e04952010-04-21 05:17:40 +0000[diff] [blame]433
Chris Lattner1dcca8b2010-04-21 06:23:40 +0000[diff] [blame]434<li>LLVM 2.7 now directly supports taking the address of a label and doing an
435 indirect branch through a pointer. This is particularly useful for
436 interpreter loops, and is used to implement the GCC "address of label"
437 extension. For more information, see the <a
438href="http://blog.llvm.org/2010/01/address-of-label-and-indirect-branches.html">
439Address of Label and Indirect Branches in LLVM IR Blog Post</a>.
Chris Lattner87e04952010-04-21 05:17:40 +0000[diff] [blame]440
Chris Lattner1dcca8b2010-04-21 06:23:40 +0000[diff] [blame]441<li>LLVM 2.7 is the first release to start supporting APIs for assembling and
442 disassembling target machine code. These APIs are useful for a variety of
443 low level clients, and are surfaced in the new "enhanced disassembly" API.
444 For more information see the <a
445 href="http://blog.llvm.org/2010/01/x86-disassembler.html">The X86
446 Disassembler Blog Post</a> for more information.</li>
Chris Lattner87e04952010-04-21 05:17:40 +0000[diff] [blame]447
Chris Lattner1dcca8b2010-04-21 06:23:40 +0000[diff] [blame]448<li>LLVM 2.7 includes major parts of the work required by the new MC Project,
449 which aims to rework our handling of low-level machine code. A few targets
450 have been refactored to support it, and work is underway to support a native
451 assembler in LLVM. This work is not complete in LLVM 2.7, but you has made
452 substantially more progress on LLVM mainline. You can read more about this
453 in the <a href="http://blog.llvm.org/2010/04/intro-to-llvm-mc-project.html">
454 Intro to the LLVM MC Project Blog Post</a>.
455</li>
Chris Lattner87e04952010-04-21 05:17:40 +0000[diff] [blame]456
Chris Lattner458e79f2008-02-10 08:18:42 +0000[diff] [blame]457</ul>
Chris Lattner10a3cc42010-03-17 06:41:58 +0000[diff] [blame]458
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]459</div>
460
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]461<!--=========================================================================-->
462<div class="doc_subsection">
Chris Lattnerd1094e02009-03-02 02:37:32 +0000[diff] [blame]463<a name="coreimprovements">LLVM IR and Core Improvements</a>
Chris Lattnerdd6acc02008-02-10 08:17:19 +0000[diff] [blame]464</div>
465
466<div class="doc_text">
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]467<p>LLVM IR has several new features for better support of new targets and that
468expose new optimization opportunities:</p>
Chris Lattnerdd6acc02008-02-10 08:17:19 +0000[diff] [blame]469
Chris Lattnerb7112222008-06-05 06:25:56 +0000[diff] [blame]470<ul>
Chris Lattner1dcca8b2010-04-21 06:23:40 +0000[diff] [blame]471<li>LLVM IR now supports a 16-bit "half float" data type through two new <a
472 href="LangRef.html#int_fp16">intrinsics</a> and APFloat support.</li>
473<li>LLVM IR supports two <a href="LangRef.html#fnattrs">new function
474 attributes</a>: inlinehint and alignstack(n). The former is a hint to the
475 optimizer that a function was declared 'inline' and thus it might be useful
476 to increase the chances the the inliner actually inline it. The later
477 indicates to the code generator that the function diverges from the platform
478 ABI on stack alignment.</li>
479<li>The new <a href="LangRef.html#int_objectsize">llvm.objectsize</a> intrinsic
480 allows the optimizer to infer the sizes of memory objects in some cases.
481 This intrinsic is used to implement the GCC __builtin_object_size
482 extension.</li>
483<li>LLVM 2.7 has pre-alpha support for <a
484 href="http://llvm.org/docs/LangRef.html#t_union">unions in LLVM IR</a>.
485 Unfortuantely, this support is not really usable in 2.7, so if you're
486 interested in pushing it forward, please help contribute to LLVM mainline.</li>
Chris Lattner87e04952010-04-21 05:17:40 +0000[diff] [blame]487</li>
Chris Lattnerdd6acc02008-02-10 08:17:19 +0000[diff] [blame]488</ul>
Mikhail Glushenkov024f7cf2008-10-13 02:08:34 +0000[diff] [blame]489
Chris Lattnerdd6acc02008-02-10 08:17:19 +0000[diff] [blame]490</div>
491
492<!--=========================================================================-->
493<div class="doc_subsection">
Chris Lattner2b8a52e2008-02-10 07:46:44 +0000[diff] [blame]494<a name="optimizer">Optimizer Improvements</a>
495</div>
496
497<div class="doc_text">
498
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]499<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]500release includes a few major enhancements and additions to the optimizers:</p>
Chris Lattner2b8a52e2008-02-10 07:46:44 +0000[diff] [blame]501
502<ul>
503
Chris Lattnera668b452010-04-21 06:42:24 +0000[diff] [blame]504<li>Inliner reuses arrays allocas when inlining multiple callers to reduce stack usage.</li>
505<li>Instcombine is now a library, has its own IRBuilder to simplify itself.</li>
506<li>Better code size analysis in loop unswitch, inliner code split out to a new
507 CodeMetrics class for reuse.</li>
508<li>Many changes to the pass ordering for improved optimization
509 effectiveness.</li>
510<li>BasicAA improved to be less dependent on "type safe" pointers, it can now look
511 through bitcasts more aggressively.</li>
512<li>GVN PHI Translation improvements. blog post: http://blog.llvm.org/2009/12/advanced-topics-in-redundant-load.html</li>
513<li>New SCEV AA pass: -scev-aa</li>
514<li>Target data now has notion of 'native' integer data types which optimizations can use.</li>
515<li>Opt now works conservatively if no target data is set (is this fully working?)</li>
516<li>New Analysis/InstructionSimplify.h interface for simplifying instructions that don't exist.</li>
517<li>Jump threading is now much more aggressive at simplifying correlated
Chris Lattner87e04952010-04-21 05:17:40 +0000[diff] [blame]518 conditionals and threading blocks with otherwise complex logic. CondProp pass
Chris Lattnera668b452010-04-21 06:42:24 +0000[diff] [blame]519 removed (functionality merged into jump threading).</li>
520<li>New SSAUpdater and MachineSSAUpdater classes for unstructured ssa updating,
Chris Lattner87e04952010-04-21 05:17:40 +0000[diff] [blame]521 changed jump threading, GVN, etc to use it which simplified them and speed
Chris Lattnera668b452010-04-21 06:42:24 +0000[diff] [blame]522 them up.</li>
Chris Lattner87e04952010-04-21 05:17:40 +0000[diff] [blame]523
Chris Lattnerd1094e02009-03-02 02:37:32 +0000[diff] [blame]524
Chris Lattnera668b452010-04-21 06:42:24 +0000[diff] [blame]525<li>
526The Optimal Edge Profiling implementation in 2.6 was more a proof of
527concept. The current implementation (the one that will go into 2.7) is
528now stable and (as far as my tests go) bug free.
529
530The profiling with instrumentation via "opt" and analysis via the tool
531"llvm-prof" should Work As Expected (TM).
532
533Two things are missing:
534
535*) Still missing is the modification of all -std-compile-opt passes to
536update the profiling information according to the changes made to the
537CFG, I'm planning to do this after my master thesis is finished. This
538will enable all passes to use the ProfileInfo if available and base
539decisions on that information.
540
541*) GCC has the options "-pg", "-fprofile-arcs" and "--coverage" that
542insert profiling code and "-fprofile-use" to use them the next time
543during compilation. I guess this options should also work properly in
544llvm-gcc and clang?</li>
545
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]546</ul>
Chris Lattnerd1094e02009-03-02 02:37:32 +0000[diff] [blame]547
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]548</div>
Chris Lattnerd1094e02009-03-02 02:37:32 +0000[diff] [blame]549
Chris Lattnerd1094e02009-03-02 02:37:32 +0000[diff] [blame]550
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]551<!--=========================================================================-->
552<div class="doc_subsection">
553<a name="executionengine">Interpreter and JIT Improvements</a>
554</div>
Chris Lattner25879d72008-10-13 21:50:36 +0000[diff] [blame]555
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]556<div class="doc_text">
557
558<ul>
Chris Lattner87e04952010-04-21 05:17:40 +0000[diff] [blame]559<li>The JIT now supports generating debug information, which is compatible with
560the new GDB 7.0 (and later) interfaces for registering debug info for
561dynamically generated code.</li>
562
Jeffrey Yasskin9fb8ce82010-01-29 19:10:38 +0000[diff] [blame]563<li>The JIT now <a
564href="http://llvm.org/viewvc/llvm-project?view=rev&revision=85295">defaults
565to compiling eagerly</a> to avoid a race condition in the lazy JIT.
566Clients that still want the lazy JIT can switch it on by calling
567<tt>ExecutionEngine::DisableLazyCompilation(false)</tt>.</li>
Chris Lattner87e04952010-04-21 05:17:40 +0000[diff] [blame]568
Jeffrey Yasskine0913882010-02-11 01:07:39 +0000[diff] [blame]569<li>It is now possible to create more than one JIT instance in the same process.
570These JITs can generate machine code in parallel,
571although <a href="http://llvm.org/docs/ProgrammersManual.html#jitthreading">you
572still have to obey the other threading restrictions</a>.</li>
Chris Lattner87e04952010-04-21 05:17:40 +0000[diff] [blame]573
Chris Lattner7795ea92008-06-08 02:45:07 +0000[diff] [blame]574</ul>
575
576</div>
577
578<!--=========================================================================-->
579<div class="doc_subsection">
Chris Lattnerd434bfb2009-03-02 03:24:11 +0000[diff] [blame]580<a name="codegen">Target Independent Code Generator Improvements</a>
Chris Lattner7795ea92008-06-08 02:45:07 +0000[diff] [blame]581</div>
582
583<div class="doc_text">
584
Mikhail Glushenkov25422542009-03-01 18:09:47 +0000[diff] [blame]585<p>We have put a significant amount of work into the code generator
586infrastructure, which allows us to implement more aggressive algorithms and make
587it run faster:</p>
Chris Lattner7795ea92008-06-08 02:45:07 +0000[diff] [blame]588
589<ul>
Chris Lattner1dcca8b2010-04-21 06:23:40 +0000[diff] [blame]590<li>New instruction selector [blog post?].</li>
Chris Lattnera668b452010-04-21 06:42:24 +0000[diff] [blame]591<li>New LSR with "full strength reduction" mode. Description?</li>
592<li>Code generator MC'ized except for debug info and EH.</li>
593<li>New CodeGen Level CSE</li>
594<li>Combiner-AA improvements, why not on by default?</li>
595<li>Pre-regalloc tail duplication</li>
596<li>Codegen level OptimizeExtsPass pass, takes advantage of x86 subregs. </li>
597<li>Support for the GCC option -fno-schedule-insns</li>
598<li>Non-temporal load/store, only implemented on X86, see LangRef.html#i_load.</li>
599<li>MachineSSAUpdater.h</li>
600<li>X86 and XCore supports returning arbitrary return values, returning too many values is
601 supported by returning through a hidden pointer.</li>
602<li>verbose-asm now produces information about spill slots and loop nests</li>
603<li>GHC Haskell ABI / calling conv support.</li>
604<li>Many improvements to debug info</li>
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]605</ul>
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]606</div>
607
Chris Lattnerd1094e02009-03-02 02:37:32 +0000[diff] [blame]608<!--=========================================================================-->
609<div class="doc_subsection">
610<a name="x86">X86-32 and X86-64 Target Improvements</a>
611</div>
612
613<div class="doc_text">
614<p>New features of the X86 target include:
615</p>
616
617<ul>
Chris Lattnera668b452010-04-21 06:42:24 +0000[diff] [blame]618<li>The X86 backend now optimizes tails calls much more aggressively for
619 functions that use the standard C calling convention.</li>
620<li>The X86 backend now models scalar SSE registers as subregs of the SSE vector
621 registers, making the code generator more aggressive in cases where scalars
622 and vector types are mixed.</li>
Chris Lattnerd434bfb2009-03-02 03:24:11 +0000[diff] [blame]623
Chris Lattnera668b452010-04-21 06:42:24 +0000[diff] [blame]624<li>PostRA scheduler for X86? FIXME: is this on by default in 2.7?</li>
Chris Lattnerd434bfb2009-03-02 03:24:11 +0000[diff] [blame]625
Chris Lattnerd1094e02009-03-02 02:37:32 +0000[diff] [blame]626</ul>
627
Chris Lattnerd1094e02009-03-02 02:37:32 +0000[diff] [blame]628</div>
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]629
630<!--=========================================================================-->
631<div class="doc_subsection">
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]632<a name="ARM">ARM Target Improvements</a>
Chris Lattnerc92d7692009-03-01 02:30:21 +0000[diff] [blame]633</div>
634
635<div class="doc_text">
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]636<p>New features of the ARM target include:
637</p>
Chris Lattnerc92d7692009-03-01 02:30:21 +0000[diff] [blame]638
639<ul>
Chris Lattnerc92d7692009-03-01 02:30:21 +0000[diff] [blame]640
Chris Lattner1dcca8b2010-04-21 06:23:40 +0000[diff] [blame]641<li>The ARM backend now generates instructions in unified assembly syntax.</li>
642
643<li>llvm-gcc now has complete support for the ARM v7 NEON instruction set. This
644 support differs slightly from the GCC implementation. Please see the
645 <a
646href="http://blog.llvm.org/2010/04/arm-advanced-simd-neon-intrinsics-and.html">
647 ARM Advanced SIMD (NEON) Intrinsics and Types in LLVM Blog Post</a> for
648 helpful information if migrating code from GCC to LLVM-GCC.</li>
649
650<li>The ARM and Thumb code generators now using register scavenging for stack
651 object address materialization.(FIXME: WHAT BENEFIT DOES THIS PROVIDE?)</li>
652
653<li>The ARM backend now has good support for ARMv4 targets, and has been tested
654 on StrongARM hardware. Previously, LLVM only supported ARMv4T and
655 newer chips.</li>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]656</ul>
Chris Lattnerc92d7692009-03-01 02:30:21 +0000[diff] [blame]657
Chris Lattnerc92d7692009-03-01 02:30:21 +0000[diff] [blame]658
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]659</div>
Chris Lattnerc92d7692009-03-01 02:30:21 +0000[diff] [blame]660
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]661<!--=========================================================================-->
662<div class="doc_subsection">
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]663<a name="newapis">New Useful APIs</a>
664</div>
665
666<div class="doc_text">
667
668<p>This release includes a number of new APIs that are used internally, which
669 may also be useful for external clients.
670</p>
671
672<ul>
Chris Lattner1dcca8b2010-04-21 06:23:40 +0000[diff] [blame]673<li>The llvm/Support/Regex.h header exposes a platform independent regular
674 expression API. Building on this, the <a
675 href="TestingGuide.html#FileCheck">FileCheck</a> utility now supports
676 regular exressions.</li>
677<li>raw_ostream now supports a circular "debug stream" accessed with "dbgs()".
678 By default, this stream works the same way as "errs()", but if you pass
679 <tt>-debug-buffer-size=1000</tt> to opt, the debug stream is capped to a
680 fixed sized circular buffer and the output is printed at the end of the
681 program's execution. This is helpful if you have a long lived compiler
682 process and you're interested in seeing snapshots in time.</li>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]683</ul>
684
685
686</div>
687
688<!--=========================================================================-->
689<div class="doc_subsection">
690<a name="otherimprovements">Other Improvements and New Features</a>
691</div>
692
693<div class="doc_text">
694<p>Other miscellaneous features include:</p>
695
696<ul>
Chris Lattner1dcca8b2010-04-21 06:23:40 +0000[diff] [blame]697<li>You can now build LLVM as a big dynamic library (e.g. "libllvm2.7.so"). To
698 get this, configure LLVM with the --enable-shared option.</li>
699
Chris Lattner87e04952010-04-21 05:17:40 +0000[diff] [blame]700<li>LLVM command line tools now overwrite their output by default, before they
701 would only do this with -f. This makes them more convenient to use, and
702 behave more like standard unix tools.</li>
703
704<li>The opt and llc tools now autodetect whether their input is a .ll or .bc
705 file, and automatically do the right thing. This means you don't need to
706 explicitly use the llvm-as tool for most things.</li>
Chris Lattnerc92d7692009-03-01 02:30:21 +0000[diff] [blame]707</ul>
708
709</div>
710
Chris Lattner6cb64032008-06-05 08:02:49 +0000[diff] [blame]711
712<!--=========================================================================-->
713<div class="doc_subsection">
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]714<a name="changes">Major Changes and Removed Features</a>
715</div>
716
717<div class="doc_text">
718
Chris Lattner934e2d42008-10-13 22:06:31 +0000[diff] [blame]719<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]720on LLVM 2.6, this section lists some "gotchas" that you may run into upgrading
Chris Lattner934e2d42008-10-13 22:06:31 +0000[diff] [blame]721from the previous release.</p>
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]722
723<ul>
Chris Lattner87e04952010-04-21 05:17:40 +0000[diff] [blame]724
725<li>
726The Andersen's alias analysis ("anders-aa") pass, the Predicate Simplifier
727("predsimplify") pass, the LoopVR pass, the GVNPRE pass, and the random sampling
728profiling ("rsprofiling") passes have all been removed. They were not being
729actively maintained and had substantial problems. If you are interested in
730these components, you are welcome to ressurect them from SVN, fix the
731correctness problems, and resubmit them to mainline.</li>
732
733<li>LLVM now defaults to building most libraries with RTTI turned off, providing
734a code size reduction. Packagers who are interested in building LLVM to support
735plugins that require RTTI information should build with "make REQUIRE_RTTI=1"
736and should read the new <a href="Packaging.html">Advice on Packaging LLVM</a>
737document.</li>
738
Jeffrey Yasskin914050b2010-02-09 23:03:44 +0000[diff] [blame]739<li>The LLVM interpreter now defaults to <em>not</em> using <tt>libffi</tt> even
740if you have it installed. This makes it more likely that an LLVM built on one
741system will work when copied to a similar system. To use <tt>libffi</tt>,
Chris Lattner87e04952010-04-21 05:17:40 +0000[diff] [blame]742configure with <tt>--enable-libffi</tt></li>.
Chris Lattner934e2d42008-10-13 22:06:31 +0000[diff] [blame]743
Chris Lattner87e04952010-04-21 05:17:40 +0000[diff] [blame]744<li>Debug information uses a completely different representation, an LLVM 2.6
745.bc file should work with LLVM 2.7, but debug info won't come forward.</li>
746
747<li>The LLVM 2.6 (and earlier) "malloc" and "free" instructions got removed,
748 along with LowerAllocations pass. Now you should just use a call to the
749 malloc and free functions in libc. These calls are optimized as well as
750 the old instructions were.</li>
751</ul>
Chris Lattner934e2d42008-10-13 22:06:31 +0000[diff] [blame]752
753<p>In addition, many APIs have changed in this release. Some of the major LLVM
754API changes are:</p>
755
756<ul>
Chris Lattner87e04952010-04-21 05:17:40 +0000[diff] [blame]757<li>Just about everything has been converted to use raw_ostream instead of
758 std::ostream.</li>
759<li>llvm/ADT/iterator.h has been removed, just use &lt;iterator&gt;
760 instead.</li>
761<li>The Streams.h file and "DOUT" got removed, use "DEBUG(errs() &lt;&lt; ...);"
762 instead.</li>
Jeffrey Yasskin4a8b1da2010-01-28 01:41:20 +0000[diff] [blame]763<li><tt>ModuleProvider</tt> has been <a
764href="http://llvm.org/viewvc/llvm-project?view=rev&revision=94686">removed</a>
765and its methods moved to <tt>Module</tt> and <tt>GlobalValue</tt>.
766Most clients can remove uses of <tt>ExistingModuleProvider</tt>,
767replace <tt>getBitcodeModuleProvider</tt> with
768<tt>getLazyBitcodeModule</tt>, and pass their <tt>Module</tt> to
769functions that used to accept <tt>ModuleProvider</tt>. Clients who
770wrote their own <tt>ModuleProvider</tt>s will need to derive from
771<tt>GVMaterializer</tt> instead and use
772<tt>Module::setMaterializer</tt> to attach it to a
773<tt>Module</tt>.</li>
774
775<li><tt>GhostLinkage</tt> has given up the ghost.
776<tt>GlobalValue</tt>s that have not yet been read from their backing
777storage have the same linkage they will have after being read in.
778Clients must replace calls to
779<tt>GlobalValue::hasNotBeenReadFromBitcode</tt> with
780<tt>GlobalValue::isMaterializable</tt>.</li>
Daniel Dunbar1e96fca2010-02-10 04:09:52 +0000[diff] [blame]781
Daniel Dunbar3e255da2010-02-14 01:47:19 +0000[diff] [blame]782<li>The <tt>llvm/Support/DataTypes.h</tt> header has moved
783to <tt>llvm/System/DataTypes.h</tt>.</li>
784
Duncan Sands80c430a2010-02-17 17:20:17 +0000[diff] [blame]785<li>The <tt>isInteger</tt>, <tt>isIntOrIntVector</tt>, <tt>isFloatingPoint</tt>,
786<tt>isFPOrFPVector</tt> and <tt>isFPOrFPVector</tt> methods have been renamed
787<tt>isIntegerTy</tt>, <tt>isIntOrIntVectorTy</tt>, <tt>isFloatingPointTy</tt>,
788<tt>isFPOrFPVectorTy</tt> and <tt>isFPOrFPVectorTy</tt> respectively.</li>
Devang Pateldbf83832008-10-14 20:03:43 +0000[diff] [blame]789</ul>
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]790
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]791</div>
792
793
794
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]795<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]796<div class="doc_section">
797 <a name="portability">Portability and Supported Platforms</a>
798</div>
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]799<!-- *********************************************************************** -->
800
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]801<div class="doc_text">
802
John Criswell64307722004-12-08 20:35:47 +0000[diff] [blame]803<p>LLVM is known to work on the following platforms:</p>
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]804
805<ul>
Mikhail Glushenkov25422542009-03-01 18:09:47 +0000[diff] [blame]806<li>Intel and AMD machines (IA32, X86-64, AMD64, EMT-64) running Red Hat
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]807 Linux, Fedora Core, FreeBSD and AuroraUX (and probably other unix-like
808 systems).</li>
Mikhail Glushenkov25422542009-03-01 18:09:47 +0000[diff] [blame]809<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]810 and 64-bit modes.</li>
Chris Lattnercdc44ed2008-02-06 18:00:06 +0000[diff] [blame]811<li>Intel and AMD machines running on Win32 using MinGW libraries (native).</li>
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]812<li>Intel and AMD machines running on Win32 with the Cygwin libraries (limited
813 support is available for native builds with Visual C++).</li>
Chris Lattner51948622009-10-16 16:30:58 +0000[diff] [blame]814<li>Sun x86 and AMD64 machines running Solaris 10, OpenSolaris 0906.</li>
John Criswelld5234922005-05-13 20:28:15 +0000[diff] [blame]815<li>Alpha-based machines running Debian GNU/Linux.</li>
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]816</ul>
817
Chris Lattner618a99f2008-06-05 06:57:39 +0000[diff] [blame]818<p>The core LLVM infrastructure uses GNU autoconf to adapt itself
Brian Gaekee3e557e2004-05-09 05:28:35 +0000[diff] [blame]819to the machine and operating system on which it is built. However, minor
820porting may be required to get LLVM to work on new platforms. We welcome your
821portability patches and reports of successful builds or error messages.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]822
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]823</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]824
825<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]826<div class="doc_section">
827 <a name="knownproblems">Known Problems</a>
828</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]829<!-- *********************************************************************** -->
830
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]831<div class="doc_text">
832
Mikhail Glushenkov25422542009-03-01 18:09:47 +0000[diff] [blame]833<p>This section contains significant known problems with the LLVM system,
Chris Lattner2a092392008-11-10 05:40:34 +0000[diff] [blame]834listed by component. If you run into a problem, please check the <a
Chris Lattnera69595e2005-10-29 07:07:09 +0000[diff] [blame]835href="http://llvm.org/bugs/">LLVM bug database</a> and submit a bug if
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]836there isn't already one.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]837
Chris Lattner6aba4862010-03-17 17:25:49 +0000[diff] [blame]838<ul>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]839<li>LLVM will not correctly compile on Solaris and/or OpenSolaris
840using the stock GCC 3.x.x series 'out the box',
Chris Lattner6e41c792009-11-03 21:50:09 +0000[diff] [blame]841See: <a href="GettingStarted.html#brokengcc">Broken versions of GCC and other tools</a>.
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]842However, A <a href="http://pkg.auroraux.org/GCC">Modern GCC Build</a>
843for x86/x86-64 has been made available from the third party AuroraUX Project
844that has been meticulously tested for bootstrapping LLVM &amp; Clang.</li>
845</ul>
846
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]847</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]848
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]849<!-- ======================================================================= -->
850<div class="doc_subsection">
851 <a name="experimental">Experimental features included with this release</a>
852</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]853
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]854<div class="doc_text">
855
Misha Brukmanfa50a222004-05-12 21:46:05 +0000[diff] [blame]856<p>The following components of this LLVM release are either untested, known to
857be broken or unreliable, or are in early development. These components should
858not be relied on, and bugs should not be filed against them, but they may be
859useful 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]860components, please contact us on the <a
861href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVMdev list</a>.</p>
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]862
863<ul>
Wesley Peck3aa84e52010-03-18 14:31:30 +0000[diff] [blame]864<li>The MSIL, Alpha, SPU, MIPS, PIC16, Blackfin, MSP430, SystemZ and MicroBlaze
865 backends are experimental.</li>
Bill Wendling89cd82f2009-03-02 07:54:14 +0000[diff] [blame]866<li>The <tt>llc</tt> "<tt>-filetype=asm</tt>" (the default) is the only
Chris Lattner0b1c9a52010-03-17 04:41:49 +0000[diff] [blame]867 supported value for this option. The MachO writer is experimental, and
868 works much better in mainline SVN.</li>
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]869</ul>
870
871</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]872
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]873<!-- ======================================================================= -->
874<div class="doc_subsection">
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]875 <a name="x86-be">Known problems with the X86 back-end</a>
John Criswell3bdbd302005-11-08 21:11:33 +0000[diff] [blame]876</div>
877
878<div class="doc_text">
879
880<ul>
Anton Korobeynikov486c7d32008-06-08 10:24:13 +0000[diff] [blame]881 <li>The X86 backend does not yet support
882 all <a href="http://llvm.org/PR879">inline assembly that uses the X86
883 floating point stack</a>. It supports the 'f' and 't' constraints, but not
884 'u'.</li>
Chris Lattnerb076b002008-06-08 21:19:07 +0000[diff] [blame]885 <li>The X86 backend generates inefficient floating point code when configured
886 to generate code for systems that don't have SSE2.</li>
Duncan Sands0bc15262008-06-08 19:38:43 +0000[diff] [blame]887 <li>Win64 code generation wasn't widely tested. Everything should work, but we
John Criswellea03c9d2009-03-02 15:28:15 +0000[diff] [blame]888 expect small issues to happen. Also, llvm-gcc cannot build the mingw64
889 runtime currently due
Anton Korobeynikov486c7d32008-06-08 10:24:13 +0000[diff] [blame]890 to <a href="http://llvm.org/PR2255">several</a>
John Criswellea03c9d2009-03-02 15:28:15 +0000[diff] [blame]891 <a href="http://llvm.org/PR2257">bugs</a> and due to lack of support for
892 the
893 'u' inline assembly constraint and for X87 floating point inline assembly.</li>
Dan Gohman721b3722008-06-08 23:05:11 +0000[diff] [blame]894 <li>The X86-64 backend does not yet support the LLVM IR instruction
Chris Lattnerd1094e02009-03-02 02:37:32 +0000[diff] [blame]895 <tt>va_arg</tt>. Currently, the llvm-gcc and front-ends support variadic
Dan Gohman721b3722008-06-08 23:05:11 +0000[diff] [blame]896 argument constructs on X86-64 by lowering them manually.</li>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]897</ul>
898
899</div>
900
901<!-- ======================================================================= -->
902<div class="doc_subsection">
903 <a name="ppc-be">Known problems with the PowerPC back-end</a>
904</div>
905
906<div class="doc_text">
907
908<ul>
Nicolas Geoffray77d99502007-05-15 09:21:28 +0000[diff] [blame]909<li>The Linux PPC32/ABI support needs testing for the interpreter and static
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]910compilation, and lacks support for debug information.</li>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]911</ul>
912
913</div>
914
915<!-- ======================================================================= -->
916<div class="doc_subsection">
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]917 <a name="arm-be">Known problems with the ARM back-end</a>
918</div>
919
920<div class="doc_text">
921
922<ul>
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]923<li>Thumb mode works only on ARMv6 or higher processors. On sub-ARMv6
Duncan Sands47fc0a22007-09-26 15:59:54 +0000[diff] [blame]924processors, thumb programs can crash or produce wrong
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]925results (<a href="http://llvm.org/PR1388">PR1388</a>).</li>
John Criswellea03c9d2009-03-02 15:28:15 +0000[diff] [blame]926<li>Compilation for ARM Linux OABI (old ABI) is supported but not fully tested.
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]927</li>
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]928</ul>
929
930</div>
931
932<!-- ======================================================================= -->
933<div class="doc_subsection">
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]934 <a name="sparc-be">Known problems with the SPARC back-end</a>
935</div>
936
937<div class="doc_text">
938
939<ul>
John Criswellea03c9d2009-03-02 15:28:15 +0000[diff] [blame]940<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]941 support the 64-bit SPARC ABI (-m64).</li>
942</ul>
943
944</div>
945
946<!-- ======================================================================= -->
947<div class="doc_subsection">
Bruno Cardoso Lopes24eb3de2008-10-25 14:56:26 +0000[diff] [blame]948 <a name="mips-be">Known problems with the MIPS back-end</a>
949</div>
950
951<div class="doc_text">
952
953<ul>
Bruno Cardoso Lopes24eb3de2008-10-25 14:56:26 +0000[diff] [blame]954<li>64-bit MIPS targets are not supported yet.</li>
955</ul>
956
957</div>
958
959<!-- ======================================================================= -->
960<div class="doc_subsection">
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]961 <a name="alpha-be">Known problems with the Alpha back-end</a>
962</div>
963
964<div class="doc_text">
965
966<ul>
967
968<li>On 21164s, some rare FP arithmetic sequences which may trap do not have the
969appropriate nops inserted to ensure restartability.</li>
970
John Criswell3bdbd302005-11-08 21:11:33 +0000[diff] [blame]971</ul>
972</div>
973
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]974<!-- ======================================================================= -->
975<div class="doc_subsection">
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]976 <a name="c-be">Known problems with the C back-end</a>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]977</div>
978
979<div class="doc_text">
980
981<ul>
Chris Lattnera1a4c9a2008-06-05 06:35:40 +0000[diff] [blame]982<li><a href="http://llvm.org/PR802">The C backend has only basic support for
983 inline assembly code</a>.</li>
Chris Lattner8e061162007-09-26 06:01:35 +0000[diff] [blame]984<li><a href="http://llvm.org/PR1658">The C backend violates the ABI of common
985 C++ programs</a>, preventing intermixing between C++ compiled by the CBE and
Gabor Greif75b2f762009-03-02 12:02:51 +0000[diff] [blame]986 C++ code compiled with <tt>llc</tt> or native compilers.</li>
Duncan Sandse09506a2008-02-10 13:40:55 +0000[diff] [blame]987<li>The C backend does not support all exception handling constructs.</li>
Duncan Sands3aa36732009-02-25 11:51:54 +0000[diff] [blame]988<li>The C backend does not support arbitrary precision integers.</li>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]989</ul>
990
991</div>
John Criswell3bdbd302005-11-08 21:11:33 +0000[diff] [blame]992
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]993
994<!-- ======================================================================= -->
995<div class="doc_subsection">
Chris Lattner0b1c9a52010-03-17 04:41:49 +0000[diff] [blame]996 <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]997</div>
Chris Lattner178f3db2003-10-02 05:07:23 +0000[diff] [blame]998
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]999<div class="doc_text">
Chris Lattner72a269f2006-03-03 00:34:26 +0000[diff] [blame]1000
Chris Lattnera1a4c9a2008-06-05 06:35:40 +0000[diff] [blame]1001<p>The only major language feature of GCC not supported by llvm-gcc is
1002 the <tt>__builtin_apply</tt> family of builtins. However, some extensions
1003 are only supported on some targets. For example, trampolines are only
Duncan Sands56448462008-06-08 20:18:35 +0000[diff] [blame]1004 supported on some targets (these are used when you take the address of a
1005 nested function).</p>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]1006
Chris Lattnera1a4c9a2008-06-05 06:35:40 +0000[diff] [blame]1007<p>If you run into GCC extensions which are not supported, please let us know.
1008</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]1009
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]1010</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]1011
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]1012<!-- ======================================================================= -->
1013<div class="doc_subsection">
Chris Lattner7292fb12008-10-30 03:58:13 +0000[diff] [blame]1014 <a name="fortran-fe">Known problems with the llvm-gcc Fortran front-end</a>
1015</div>
1016
1017<div class="doc_text">
Gabor Greife5f9d672008-11-04 21:50:59 +0000[diff] [blame]1018<ul>
Chris Lattner7292fb12008-10-30 03:58:13 +0000[diff] [blame]1019<li>Fortran support generally works, but there are still several unresolved bugs
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]1020 in <a href="http://llvm.org/bugs/">Bugzilla</a>. Please see the
1021 tools/gfortran component for details.</li>
Gabor Greife5f9d672008-11-04 21:50:59 +0000[diff] [blame]1022</ul>
Chris Lattner7292fb12008-10-30 03:58:13 +0000[diff] [blame]1023</div>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]1024
Chris Lattnere38ac152008-02-12 06:29:45 +0000[diff] [blame]1025<!-- ======================================================================= -->
1026<div class="doc_subsection">
Chris Lattnera1a4c9a2008-06-05 06:35:40 +0000[diff] [blame]1027 <a name="ada-fe">Known problems with the llvm-gcc Ada front-end</a>
Chris Lattnere38ac152008-02-12 06:29:45 +0000[diff] [blame]1028</div>
1029
1030<div class="doc_text">
John Criswellea03c9d2009-03-02 15:28:15 +0000[diff] [blame]1031The llvm-gcc 4.2 Ada compiler works fairly well; however, this is not a mature
1032technology, and problems should be expected.
Chris Lattnere38ac152008-02-12 06:29:45 +0000[diff] [blame]1033<ul>
Duncan Sands56448462008-06-08 20:18:35 +0000[diff] [blame]1034<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]1035to lack of trampoline support (pointers to nested functions) on other platforms.
1036However, 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]1037which does support trampolines.</li>
1038<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]1039This is due to lack of LLVM support for <tt>setjmp</tt>/<tt>longjmp</tt> style
1040exception handling, which is used internally by the compiler.
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]1041Workaround: configure with <tt>--disable-bootstrap</tt>.</li>
Duncan Sandsaef747f2008-10-13 17:27:23 +0000[diff] [blame]1042<li>The c380004, <a href="http://llvm.org/PR2010">c393010</a>
1043and <a href="http://llvm.org/PR2421">cxg2021</a> ACATS tests fail
Duncan Sandsd34bf762009-02-25 11:59:06 +0000[diff] [blame]1044(c380004 also fails with gcc-4.2 mainline).
1045If the compiler is built with checks disabled then <a href="http://llvm.org/PR2010">c393010</a>
1046causes the compiler to go into an infinite loop, using up all system memory.</li>
Duncan Sands2dbb00e2009-03-02 16:35:57 +0000[diff] [blame]1047<li>Some GCC specific Ada tests continue to crash the compiler.</li>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]1048<li>The <tt>-E</tt> binder option (exception backtraces)
Chris Lattnere38ac152008-02-12 06:29:45 +0000[diff] [blame]1049<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]1050crashing if an exception is raised. Workaround: do not use <tt>-E</tt>.</li>
Chris Lattnere38ac152008-02-12 06:29:45 +0000[diff] [blame]1051<li>Only discrete types <a href="http://llvm.org/PR1981">are allowed to start
1052or finish at a non-byte offset</a> in a record. Workaround: do not pack records
1053or use representation clauses that result in a field of a non-discrete type
1054starting or finishing in the middle of a byte.</li>
Chris Lattnerb076b002008-06-08 21:19:07 +0000[diff] [blame]1055<li>The <tt>lli</tt> interpreter <a href="http://llvm.org/PR2009">considers
1056'main' as generated by the Ada binder to be invalid</a>.
1057Workaround: hand edit the file to use pointers for <tt>argv</tt> and
1058<tt>envp</tt> rather than integers.</li>
1059<li>The <tt>-fstack-check</tt> option <a href="http://llvm.org/PR2008">is
1060ignored</a>.</li>
Chris Lattnere38ac152008-02-12 06:29:45 +0000[diff] [blame]1061</ul>
1062</div>
1063
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]1064<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]1065<div class="doc_section">
1066 <a name="additionalinfo">Additional Information</a>
1067</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]1068<!-- *********************************************************************** -->
1069
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]1070<div class="doc_text">
1071
Chris Lattnercb5596d2005-05-16 17:13:10 +0000[diff] [blame]1072<p>A wide variety of additional information is available on the <a
Chris Lattnere0c1df42007-05-18 00:44:29 +0000[diff] [blame]1073href="http://llvm.org">LLVM web page</a>, in particular in the <a
1074href="http://llvm.org/docs/">documentation</a> section. The web page also
Reid Spencerc7f87f22007-07-09 08:04:31 +0000[diff] [blame]1075contains versions of the API documentation which is up-to-date with the
1076Subversion version of the source code.
Misha Brukman96158092005-03-30 19:14:24 +0000[diff] [blame]1077You can access versions of these documents specific to this release by going
1078into the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]1079
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]1080<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]1081us via the <a href="http://llvm.org/docs/#maillist"> mailing
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]1082lists</a>.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]1083
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]1084</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]1085
1086<!-- *********************************************************************** -->
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]1087
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]1088<hr>
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]1089<address>
Misha Brukman8834af92003-12-21 22:53:21 +0000[diff] [blame]1090 <a href="http://jigsaw.w3.org/css-validator/check/referer"><img
Misha Brukman86242e12008-12-11 17:34:48 +0000[diff] [blame]1091 src="http://jigsaw.w3.org/css-validator/images/vcss-blue" alt="Valid CSS"></a>
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]1092 <a href="http://validator.w3.org/check/referer"><img
Misha Brukman86242e12008-12-11 17:34:48 +0000[diff] [blame]1093 src="http://www.w3.org/Icons/valid-html401-blue" alt="Valid HTML 4.01"></a>
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]1094
Chris Lattnere0c1df42007-05-18 00:44:29 +0000[diff] [blame]1095 <a href="http://llvm.org/">LLVM Compiler Infrastructure</a><br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]1096 Last modified: $Date$
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]1097</address>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]1098
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]1099</body>
1100</html>