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gerrit-public.fairphone.software / fp2-dev / platform / external / llvm / 87ebbc0c5652b21278f6c351b8da3e6042caee52 / . / docs / ReleaseNotes.html
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Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
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3<html>
4<head>
Reid Spencer6454ed32004-11-18 18:38:58 +0000[diff] [blame]5 <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]6 <link rel="stylesheet" href="llvm.css" type="text/css">
Dan Gohmanb44f6c62010-05-03 23:51:05 +0000[diff] [blame]7 <title>LLVM 2.8 Release Notes</title>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]8</head>
9<body>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]10
Dan Gohmanb44f6c62010-05-03 23:51:05 +0000[diff] [blame]11<div class="doc_title">LLVM 2.8 Release Notes</div>
Mikhail Glushenkovea65d7d2008-10-13 02:08:34 +0000[diff] [blame]12
Chris Lattner0e464a92010-03-17 04:02:39 +0000[diff] [blame]13<img align=right src="http://llvm.org/img/DragonSmall.png"
Gabor Greifee2187a2010-04-22 10:21:43 +0000[diff] [blame]14 width="136" height="136" alt="LLVM Dragon Logo">
Chris Lattner0e464a92010-03-17 04:02:39 +0000[diff] [blame]15
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]16<ol>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]17 <li><a href="#intro">Introduction</a></li>
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]18 <li><a href="#subproj">Sub-project Status Update</a></li>
Dan Gohmanb44f6c62010-05-03 23:51:05 +0000[diff] [blame]19 <li><a href="#externalproj">External Projects Using LLVM 2.8</a></li>
20 <li><a href="#whatsnew">What's New in LLVM 2.8?</a></li>
Chris Lattner4b538b92004-04-30 22:17:12 +0000[diff] [blame]21 <li><a href="GettingStarted.html">Installation Instructions</a></li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]22 <li><a href="#portability">Portability and Supported Platforms</a></li>
Dan Gohman44aa9212008-10-14 16:23:02 +0000[diff] [blame]23 <li><a href="#knownproblems">Known Problems</a></li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]24 <li><a href="#additionalinfo">Additional Information</a></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]25</ol>
26
Chris Lattner7911ce22004-05-23 21:07:27 +0000[diff] [blame]27<div class="doc_author">
Dan Gohman44aa9212008-10-14 16:23:02 +0000[diff] [blame]28 <p>Written by the <a href="http://llvm.org">LLVM Team</a></p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]29</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]30
Chris Lattner7b91eda2010-04-22 05:41:35 +0000[diff] [blame]31<h1 style="color:red">These are in-progress notes for the upcoming LLVM 2.8
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]32release.<br>
33You may prefer the
Dan Gohmanb44f6c62010-05-03 23:51:05 +0000[diff] [blame]34<a href="http://llvm.org/releases/2.7/docs/ReleaseNotes.html">LLVM 2.7
35Release Notes</a>.</h1>
Jeffrey Yasskinbec48772010-01-28 01:14:43 +0000[diff] [blame]36
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]37<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]38<div class="doc_section">
39 <a name="intro">Introduction</a>
40</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]41<!-- *********************************************************************** -->
42
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]43<div class="doc_text">
44
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]45<p>This document contains the release notes for the LLVM Compiler
Dan Gohman7ae3ac82010-05-03 23:52:21 +0000[diff] [blame]46Infrastructure, release 2.8. Here we describe the status of LLVM, including
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]47major improvements from the previous release and significant known problems.
Mikhail Glushenkovf795ef02009-03-01 18:09:47 +0000[diff] [blame]48All LLVM releases may be downloaded from the <a
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]49href="http://llvm.org/releases/">LLVM releases web site</a>.</p>
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]50
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame]51<p>For more information about LLVM, including information about the latest
Chris Lattnerc463b272005-10-29 07:07:09 +0000[diff] [blame]52release, please check out the <a href="http://llvm.org/">main LLVM
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]53web site</a>. If you have questions or comments, the <a
Chris Lattnerc66bfef2010-03-17 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 Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]56
Mikhail Glushenkovea65d7d2008-10-13 02:08:34 +0000[diff] [blame]57<p>Note that if you are reading this file from a Subversion checkout or the
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]58main LLVM web page, this document applies to the <i>next</i> release, not the
Gabor Greiffa933f82008-10-14 11:00:32 +0000[diff] [blame]59current one. To see the release notes for a specific release, please see the
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]60<a href="http://llvm.org/releases/">releases page</a>.</p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]61
62</div>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]63
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]64
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]65<!--
66Almost dead code.
67 include/llvm/Analysis/LiveValues.h => Dan
68 lib/Transforms/IPO/MergeFunctions.cpp => consider for 2.8.
69 llvm/Analysis/PointerTracking.h => Edwin wants this, consider for 2.8.
Chris Lattner00736fc2010-04-13 06:37:00 +0000[diff] [blame]70 ABCD, GEPSplitterPass
Chris Lattner048fe3c2010-01-16 21:25:13 +0000[diff] [blame]71 MSIL backend?
Chris Lattnerdc910082010-03-17 06:41:58 +0000[diff] [blame]72 lib/Transforms/Utils/SSI.cpp -> ABCD depends on it.
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]73-->
74
75
Dan Gohmanb44f6c62010-05-03 23:51:05 +0000[diff] [blame]76<!-- Features that need text if they're finished for 2.8:
Chris Lattner914ce462010-04-22 06:28:20 +0000[diff] [blame]77 combiner-aa?
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]78 strong phi elim
Chris Lattnerb7c85b42010-04-21 05:17:40 +0000[diff] [blame]79 llvm.dbg.value: variable debug info for optimized code
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]80 loop dependence analysis
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]81 -->
Mikhail Glushenkovea65d7d2008-10-13 02:08:34 +0000[diff] [blame]82
Chris Lattner547a3912008-10-12 19:47:48 +0000[diff] [blame]83 <!-- for announcement email:
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]84 Logo web page.
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]85 Many new papers added to /pubs/
Chris Lattner74c80df2009-02-25 06:34:50 +0000[diff] [blame]86 -->
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]87
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]88<!-- *********************************************************************** -->
89<div class="doc_section">
90 <a name="subproj">Sub-project Status Update</a>
Chris Lattnerea34f642008-06-08 21:34:41 +0000[diff] [blame]91</div>
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]92<!-- *********************************************************************** -->
Chris Lattnerea34f642008-06-08 21:34:41 +0000[diff] [blame]93
94<div class="doc_text">
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]95<p>
Dan Gohmanb44f6c62010-05-03 23:51:05 +0000[diff] [blame]96The LLVM 2.8 distribution currently consists of code from the core LLVM
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]97repository (which roughly includes the LLVM optimizers, code generators
98and supporting tools), the Clang repository and the llvm-gcc repository. In
99addition to this code, the LLVM Project includes other sub-projects that are in
100development. Here we include updates on these subprojects.
Bill Wendling63d8c552009-03-02 04:28:57 +0000[diff] [blame]101</p>
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]102
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]103</div>
104
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]105
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]106<!--=========================================================================-->
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]107<div class="doc_subsection">
Chris Lattnerfb97b2d2008-10-13 18:11:54 +0000[diff] [blame]108<a name="clang">Clang: C/C++/Objective-C Frontend Toolkit</a>
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]109</div>
110
111<div class="doc_text">
112
Chris Lattner095539f2010-04-26 17:42:18 +0000[diff] [blame]113<p><a href="http://clang.llvm.org/">Clang</a> is an LLVM front end for the C,
114C++, and Objective-C languages. Clang aims to provide a better user experience
115through expressive diagnostics, a high level of conformance to language
116standards, fast compilation, and low memory use. Like LLVM, Clang provides a
117modular, library-based architecture that makes it suitable for creating or
118integrating with other development tools. Clang is considered a
119production-quality compiler for C and Objective-C on x86 (32- and 64-bit).</p>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]120
Chris Lattner922d00f2010-07-21 15:57:40 +0000[diff] [blame]121<p>In the LLVM 2.8 time-frame, the Clang team has made many improvements:</p>
Bill Wendling741748a2008-10-27 09:27:33 +0000[diff] [blame]122
Daniel Dunbar13739432008-10-14 23:25:09 +0000[diff] [blame]123<ul>
David Chisnall8e0bd802010-04-25 19:13:33 +0000[diff] [blame]124
Bill Wendling6bc15282009-03-02 04:28:18 +0000[diff] [blame]125</ul>
Chris Lattnerfb97b2d2008-10-13 18:11:54 +0000[diff] [blame]126</div>
127
128<!--=========================================================================-->
129<div class="doc_subsection">
130<a name="clangsa">Clang Static Analyzer</a>
131</div>
132
133<div class="doc_text">
134
Chris Lattner8cdd7932010-04-22 06:38:11 +0000[diff] [blame]135<p>The <a href="http://clang-analyzer.llvm.org/">Clang Static Analyzer</a>
136 project is an effort to use static source code analysis techniques to
137 automatically find bugs in C and Objective-C programs (and hopefully <a
138 href="http://clang-analyzer.llvm.org/dev_cxx.html">C++ in the
139 future</a>!). The tool is very good at finding bugs that occur on specific
140 paths through code, such as on error conditions.</p>
Chris Lattnercc042612008-10-14 00:52:49 +0000[diff] [blame]141
Chris Lattner922d00f2010-07-21 15:57:40 +0000[diff] [blame]142<p>In the LLVM 2.8 time-frame,
Chris Lattner8cdd7932010-04-22 06:38:11 +0000[diff] [blame]143</p>
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]144
145</div>
146
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]147<!--=========================================================================-->
148<div class="doc_subsection">
Nicolas Geoffray99a4d302008-10-14 19:23:04 +0000[diff] [blame]149<a name="vmkit">VMKit: JVM/CLI Virtual Machine Implementation</a>
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]150</div>
151
152<div class="doc_text">
153<p>
Nicolas Geoffray99a4d302008-10-14 19:23:04 +0000[diff] [blame]154The <a href="http://vmkit.llvm.org/">VMKit project</a> is an implementation of
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]155a JVM and a CLI Virtual Machine (Microsoft .NET is an
156implementation of the CLI) using LLVM for static and just-in-time
157compilation.</p>
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]158
Chris Lattner922d00f2010-07-21 15:57:40 +0000[diff] [blame]159<p>With the release of LLVM 2.8, ...</p>
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]160
161</div>
162
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]163
164<!--=========================================================================-->
165<div class="doc_subsection">
166<a name="compiler-rt">compiler-rt: Compiler Runtime Library</a>
167</div>
168
169<div class="doc_text">
170<p>
171The new LLVM <a href="http://compiler-rt.llvm.org/">compiler-rt project</a>
172is a simple library that provides an implementation of the low-level
173target-specific hooks required by code generation and other runtime components.
174For example, when compiling for a 32-bit target, converting a double to a 64-bit
175unsigned integer is compiled into a runtime call to the "__fixunsdfdi"
176function. The compiler-rt library provides highly optimized implementations of
177this and other low-level routines (some are 3x faster than the equivalent
178libgcc routines).</p>
179
180<p>
181All of the code in the compiler-rt project is available under the standard LLVM
Chris Lattner922d00f2010-07-21 15:57:40 +0000[diff] [blame]182License, a "BSD-style" license. New in LLVM 2.8:
183
184Soft float support
185</p>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]186
187</div>
188
189<!--=========================================================================-->
190<div class="doc_subsection">
Duncan Sands749fd832010-04-02 09:23:15 +0000[diff] [blame]191<a name="dragonegg">DragonEgg: llvm-gcc ported to gcc-4.5</a>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]192</div>
193
194<div class="doc_text">
195<p>
Duncan Sands749fd832010-04-02 09:23:15 +0000[diff] [blame]196<a href="http://dragonegg.llvm.org/">DragonEgg</a> is a port of llvm-gcc to
197gcc-4.5. Unlike llvm-gcc, which makes many intrusive changes to the underlying
198gcc-4.2 code, dragonegg in theory does not require any gcc-4.5 modifications
199whatsoever (currently one small patch is needed). This is thanks to the new
200<a href="http://gcc.gnu.org/wiki/plugins">gcc plugin architecture</a>, which
201makes it possible to modify the behaviour of gcc at runtime by loading a plugin,
202which is nothing more than a dynamic library which conforms to the gcc plugin
203interface. DragonEgg is a gcc plugin that causes the LLVM optimizers to be run
204instead of the gcc optimizers, and the LLVM code generators instead of the gcc
205code generators, just like llvm-gcc. To use it, you add
206"-fplugin=path/dragonegg.so" to the gcc-4.5 command line, and gcc-4.5 magically
207becomes llvm-gcc-4.5!
208</p>
209
210<p>
211DragonEgg is still a work in progress. Currently C works very well, while C++,
212Ada and Fortran work fairly well. All other languages either don't work at all,
213or only work poorly. For the moment only the x86-32 and x86-64 targets are
Duncan Sands51a51742010-04-20 19:40:58 +0000[diff] [blame]214supported, and only on linux and darwin (darwin needs an additional gcc patch).
Duncan Sands749fd832010-04-02 09:23:15 +0000[diff] [blame]215</p>
216
217<p>
Chris Lattner922d00f2010-07-21 15:57:40 +0000[diff] [blame]2182.8 status here.
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]219</p>
220
221</div>
222
223
224<!--=========================================================================-->
225<div class="doc_subsection">
226<a name="mc">llvm-mc: Machine Code Toolkit</a>
227</div>
228
229<div class="doc_text">
230<p>
Chris Lattner8cdd7932010-04-22 06:38:11 +0000[diff] [blame]231The LLVM Machine Code (aka MC) sub-project of LLVM was created to solve a number
232of problems in the realm of assembly, disassembly, object file format handling,
233and a number of other related areas that CPU instruction-set level tools work
234in. It is a sub-project of LLVM which provides it with a number of advantages
235over other compilers that do not have tightly integrated assembly-level tools.
236For a gentle introduction, please see the <a
237href="http://blog.llvm.org/2010/04/intro-to-llvm-mc-project.html">Intro to the
238LLVM MC Project Blog Post</a>.
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]239</p>
240
Chris Lattner922d00f2010-07-21 15:57:40 +0000[diff] [blame]241<p>2.8 status here</p>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]242</div>
243
244
Chris Lattnerab68e9e2009-02-26 22:33:38 +0000[diff] [blame]245<!-- *********************************************************************** -->
246<div class="doc_section">
Chris Lattner922d00f2010-07-21 15:57:40 +0000[diff] [blame]247 <a name="externalproj">External Open Source Projects Using LLVM 2.8</a>
Chris Lattnerab68e9e2009-02-26 22:33:38 +0000[diff] [blame]248</div>
249<!-- *********************************************************************** -->
250
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]251<div class="doc_text">
252
253<p>An exciting aspect of LLVM is that it is used as an enabling technology for
254 a lot of other language and tools projects. This section lists some of the
Chris Lattner922d00f2010-07-21 15:57:40 +0000[diff] [blame]255 projects that have already been updated to work with LLVM 2.8.</p>
Chris Lattner7c8e7962010-04-26 17:38:10 +0000[diff] [blame]256</div>
257
Chris Lattner3a1d4cf2010-04-22 21:34:16 +0000[diff] [blame]258
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]259<!-- *********************************************************************** -->
260<div class="doc_section">
Chris Lattner922d00f2010-07-21 15:57:40 +0000[diff] [blame]261 <a name="whatsnew">What's New in LLVM 2.8?</a>
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]262</div>
263<!-- *********************************************************************** -->
264
Chris Lattnerf8e0b4e2008-06-08 22:59:35 +0000[diff] [blame]265<div class="doc_text">
266
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]267<p>This release includes a huge number of bug fixes, performance tweaks and
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]268minor improvements. Some of the major improvements and new features are listed
269in this section.
Chris Lattnerf8e0b4e2008-06-08 22:59:35 +0000[diff] [blame]270</p>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]271
Chris Lattner914ce462010-04-22 06:28:20 +0000[diff] [blame]272</div>
273
274<!--=========================================================================-->
275<div class="doc_subsection">
276<a name="orgchanges">LLVM Community Changes</a>
277</div>
278
279<div class="doc_text">
280
Chris Lattner922d00f2010-07-21 15:57:40 +0000[diff] [blame]281<p>In addition to changes to the code, between LLVM 2.7 and 2.8, a number of
Chris Lattnerb7c85b42010-04-21 05:17:40 +0000[diff] [blame]282organization changes have happened:
283</p>
284
285<ul>
Chris Lattnerb7c85b42010-04-21 05:17:40 +0000[diff] [blame]286</ul>
Chris Lattnerf8e0b4e2008-06-08 22:59:35 +0000[diff] [blame]287</div>
288
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]289<!--=========================================================================-->
Chris Lattnerea34f642008-06-08 21:34:41 +0000[diff] [blame]290<div class="doc_subsection">
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]291<a name="majorfeatures">Major New Features</a>
292</div>
293
294<div class="doc_text">
295
Chris Lattner922d00f2010-07-21 15:57:40 +0000[diff] [blame]296<p>LLVM 2.8 includes several major new capabilities:</p>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]297
298<ul>
Chris Lattner922d00f2010-07-21 15:57:40 +0000[diff] [blame]299<li>.</li>
Chris Lattner8170c102008-02-10 08:18:42 +0000[diff] [blame]300</ul>
Chris Lattnerdc910082010-03-17 06:41:58 +0000[diff] [blame]301
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]302</div>
303
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]304<!--=========================================================================-->
305<div class="doc_subsection">
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]306<a name="coreimprovements">LLVM IR and Core Improvements</a>
Chris Lattnerf304ffc2008-02-10 08:17:19 +0000[diff] [blame]307</div>
308
309<div class="doc_text">
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]310<p>LLVM IR has several new features for better support of new targets and that
311expose new optimization opportunities:</p>
Chris Lattnerf304ffc2008-02-10 08:17:19 +0000[diff] [blame]312
Chris Lattner791f77b2008-06-05 06:25:56 +0000[diff] [blame]313<ul>
Gabor Greif17b59fe2010-07-21 10:20:08 +0000[diff] [blame]314
315<li>LLVM 2.8 changes the internal order of operands in <a
316 href="http://llvm.org/doxygen/classllvm_1_1InvokeInst.html"><tt>InvokeInst</tt></a>
317 and <a href="http://llvm.org/doxygen/classllvm_1_1CallInst.html"><tt>CallInst</tt></a>.
318 To be portable across releases, resort to <tt>CallSite</tt> and the
Gabor Greif50fb3302010-07-21 10:22:41 +0000[diff] [blame]319 high-level accessors, such as <tt>getCalledValue</tt> and <tt>setUnwindDest</tt>.
Gabor Greif17b59fe2010-07-21 10:20:08 +0000[diff] [blame]320</li>
Gabor Greif05006e22010-07-26 18:48:07 +0000[diff] [blame]321<li>
322 You can no longer pass use_iterators directly to cast<> (and similar), because
323 these routines tend to perform costly dereference operations more than once. You
324 have to dereference the iterators yourself and pass them in.
325</li>
Torok Edwin7c46cf02010-08-04 12:43:22 +0000[diff] [blame]326<li>
327 llvm.memcpy.*, llvm.memset.*, llvm.memmove.* (and possibly other?) intrinsics
328 take an extra parameter now (i1 isVolatile), totaling 5 parameters.
329 If you were creating these intrinsic calls and prototypes yourself (as opposed
330 to using Intrinsic::getDeclaration), you can use UpgradeIntrinsicFunction/UpgradeIntrinsicCall
331 to be portable accross releases.
332 Note that you cannot use Intrinsic::getDeclaration() in a backwards compatible
333 way (needs 2/3 types now, in 2.7 it needed just 1).
334</li>
335<li>
336 SetCurrentDebugLocation takes a DebugLoc now instead of a MDNode.
337 Change your code to use
338 SetCurrentDebugLocation(DebugLoc::getFromDILocation(...)).
339</li>
340<li>
341 VISIBILITY_HIDDEN is gone.
342</li>
343<li>
Owen Anderson87ebbc02010-08-04 18:27:08 +0000[diff] [blame^]344 The <tt>RegisterPass</tt> and <tt>RegisterAnalysisGroup</tt> templates are
345 considered deprecated, but continue to function in LLVM 2.8. Clients are
346 strongly advised to use the upcoming <tt>INITIALIZE_PASS()</tt> and
347 <tt>INITIALIZE_AG_PASS()</tt> macros instead.
348<li>
Torok Edwin7c46cf02010-08-04 12:43:22 +0000[diff] [blame]349 SMDiagnostic takes different parameters now. //FIXME: how to upgrade?
350</li>
351<li>
352 Some APIs got renamed:
353 <ul>
354 <li>llvm_report_error -&gt; report_fatal_error</li>
355 <li>llvm_install_error_handler -&gt; install_fatal_error_handler</li>
356 <li>llvm::DwarfExceptionHandling -&gt; llvm::JITExceptionHandling</li>
357 </ul>
358</li>
Chris Lattnerf304ffc2008-02-10 08:17:19 +0000[diff] [blame]359</ul>
Mikhail Glushenkovea65d7d2008-10-13 02:08:34 +0000[diff] [blame]360
Chris Lattnerf304ffc2008-02-10 08:17:19 +0000[diff] [blame]361</div>
362
363<!--=========================================================================-->
364<div class="doc_subsection">
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]365<a name="optimizer">Optimizer Improvements</a>
366</div>
367
368<div class="doc_text">
369
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]370<p>In addition to a large array of minor performance tweaks and bug fixes, this
Chris Lattnerf3013872008-10-13 21:50:36 +0000[diff] [blame]371release includes a few major enhancements and additions to the optimizers:</p>
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]372
373<ul>
374
Chris Lattner922d00f2010-07-21 15:57:40 +0000[diff] [blame]375<li></li>
Chris Lattnera54c1f72010-04-21 06:42:24 +0000[diff] [blame]376
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]377</ul>
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]378
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]379</div>
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]380
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]381
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]382<!--=========================================================================-->
383<div class="doc_subsection">
384<a name="executionengine">Interpreter and JIT Improvements</a>
385</div>
Chris Lattnerf3013872008-10-13 21:50:36 +0000[diff] [blame]386
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]387<div class="doc_text">
388
389<ul>
Chris Lattner922d00f2010-07-21 15:57:40 +0000[diff] [blame]390<li></li>
Chris Lattnerb7c85b42010-04-21 05:17:40 +0000[diff] [blame]391
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]392</ul>
393
394</div>
395
396<!--=========================================================================-->
397<div class="doc_subsection">
Chris Lattner511433e2009-03-02 03:24:11 +0000[diff] [blame]398<a name="codegen">Target Independent Code Generator Improvements</a>
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]399</div>
400
401<div class="doc_text">
402
Mikhail Glushenkovf795ef02009-03-01 18:09:47 +0000[diff] [blame]403<p>We have put a significant amount of work into the code generator
404infrastructure, which allows us to implement more aggressive algorithms and make
405it run faster:</p>
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]406
407<ul>
Chris Lattner922d00f2010-07-21 15:57:40 +0000[diff] [blame]408<li>MachO writer works.</li>
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]409</ul>
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]410</div>
411
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]412<!--=========================================================================-->
413<div class="doc_subsection">
414<a name="x86">X86-32 and X86-64 Target Improvements</a>
415</div>
416
417<div class="doc_text">
418<p>New features of the X86 target include:
419</p>
420
421<ul>
Chris Lattner922d00f2010-07-21 15:57:40 +0000[diff] [blame]422<li>The X86 backend now supports holding X87 floating point stack values
423 in registers across basic blocks, dramatically improving performance of code
424 that uses long double, and when targetting CPUs that don't support SSE.</li>
Chris Lattner511433e2009-03-02 03:24:11 +0000[diff] [blame]425
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]426</ul>
427
Chris Lattner917cc712009-03-02 02:37:32 +0000[diff] [blame]428</div>
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]429
430<!--=========================================================================-->
431<div class="doc_subsection">
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]432<a name="ARM">ARM Target Improvements</a>
Chris Lattnerc441fb82009-03-01 02:30:21 +0000[diff] [blame]433</div>
434
435<div class="doc_text">
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]436<p>New features of the ARM target include:
437</p>
Chris Lattnerc441fb82009-03-01 02:30:21 +0000[diff] [blame]438
439<ul>
Chris Lattnerc441fb82009-03-01 02:30:21 +0000[diff] [blame]440
Chris Lattner922d00f2010-07-21 15:57:40 +0000[diff] [blame]441<li></li>
Jim Grosbach41a77662010-04-22 18:33:31 +0000[diff] [blame]442
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]443</ul>
Chris Lattnerc441fb82009-03-01 02:30:21 +0000[diff] [blame]444
Chris Lattnerc441fb82009-03-01 02:30:21 +0000[diff] [blame]445
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]446</div>
Chris Lattnerc441fb82009-03-01 02:30:21 +0000[diff] [blame]447
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]448<!--=========================================================================-->
449<div class="doc_subsection">
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]450<a name="newapis">New Useful APIs</a>
451</div>
452
453<div class="doc_text">
454
455<p>This release includes a number of new APIs that are used internally, which
456 may also be useful for external clients.
457</p>
458
459<ul>
Chris Lattner922d00f2010-07-21 15:57:40 +0000[diff] [blame]460<li></li>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]461</ul>
462
463
464</div>
465
466<!--=========================================================================-->
467<div class="doc_subsection">
468<a name="otherimprovements">Other Improvements and New Features</a>
469</div>
470
471<div class="doc_text">
472<p>Other miscellaneous features include:</p>
473
474<ul>
Chris Lattner922d00f2010-07-21 15:57:40 +0000[diff] [blame]475<li></li>
Chris Lattnerc441fb82009-03-01 02:30:21 +0000[diff] [blame]476</ul>
477
478</div>
479
Chris Lattner77d29b12008-06-05 08:02:49 +0000[diff] [blame]480
481<!--=========================================================================-->
482<div class="doc_subsection">
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]483<a name="changes">Major Changes and Removed Features</a>
484</div>
485
486<div class="doc_text">
487
Chris Lattnereeb4da02008-10-13 22:06:31 +0000[diff] [blame]488<p>If you're already an LLVM user or developer with out-of-tree changes based
Chris Lattner922d00f2010-07-21 15:57:40 +0000[diff] [blame]489on LLVM 2.7, this section lists some "gotchas" that you may run into upgrading
Chris Lattnereeb4da02008-10-13 22:06:31 +0000[diff] [blame]490from the previous release.</p>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]491
492<ul>
Chris Lattnerb7c85b42010-04-21 05:17:40 +0000[diff] [blame]493
Chris Lattner922d00f2010-07-21 15:57:40 +0000[diff] [blame]494<li>.</li>
Chris Lattnerb7c85b42010-04-21 05:17:40 +0000[diff] [blame]495</ul>
Chris Lattnereeb4da02008-10-13 22:06:31 +0000[diff] [blame]496
497<p>In addition, many APIs have changed in this release. Some of the major LLVM
498API changes are:</p>
499
500<ul>
Devang Patelb34dd132008-10-14 20:03:43 +0000[diff] [blame]501</ul>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]502
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]503</div>
504
505
506
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]507<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]508<div class="doc_section">
509 <a name="portability">Portability and Supported Platforms</a>
510</div>
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]511<!-- *********************************************************************** -->
512
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]513<div class="doc_text">
514
John Criswell0b5b5e92004-12-08 20:35:47 +0000[diff] [blame]515<p>LLVM is known to work on the following platforms:</p>
Chris Lattner4654bdb2004-06-01 18:22:41 +0000[diff] [blame]516
517<ul>
Mikhail Glushenkovf795ef02009-03-01 18:09:47 +0000[diff] [blame]518<li>Intel and AMD machines (IA32, X86-64, AMD64, EMT-64) running Red Hat
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]519 Linux, Fedora Core, FreeBSD and AuroraUX (and probably other unix-like
520 systems).</li>
Chris Lattner914ce462010-04-22 06:28:20 +0000[diff] [blame]521<li>PowerPC and X86-based Mac OS X systems, running 10.4 and above in 32-bit
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]522 and 64-bit modes.</li>
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]523<li>Intel and AMD machines running on Win32 using MinGW libraries (native).</li>
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]524<li>Intel and AMD machines running on Win32 with the Cygwin libraries (limited
525 support is available for native builds with Visual C++).</li>
Chris Lattner7e23d6e2009-10-16 16:30:58 +0000[diff] [blame]526<li>Sun x86 and AMD64 machines running Solaris 10, OpenSolaris 0906.</li>
John Criswell9321fa82005-05-13 20:28:15 +0000[diff] [blame]527<li>Alpha-based machines running Debian GNU/Linux.</li>
Chris Lattner4654bdb2004-06-01 18:22:41 +0000[diff] [blame]528</ul>
529
Chris Lattnerbc5786b2008-06-05 06:57:39 +0000[diff] [blame]530<p>The core LLVM infrastructure uses GNU autoconf to adapt itself
Brian Gaekeb0fd7612004-05-09 05:28:35 +0000[diff] [blame]531to the machine and operating system on which it is built. However, minor
532porting may be required to get LLVM to work on new platforms. We welcome your
533portability patches and reports of successful builds or error messages.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]534
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]535</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]536
537<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]538<div class="doc_section">
539 <a name="knownproblems">Known Problems</a>
540</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]541<!-- *********************************************************************** -->
542
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]543<div class="doc_text">
544
Mikhail Glushenkovf795ef02009-03-01 18:09:47 +0000[diff] [blame]545<p>This section contains significant known problems with the LLVM system,
Chris Lattnere18b32e2008-11-10 05:40:34 +0000[diff] [blame]546listed by component. If you run into a problem, please check the <a
Chris Lattnerc463b272005-10-29 07:07:09 +0000[diff] [blame]547href="http://llvm.org/bugs/">LLVM bug database</a> and submit a bug if
Chris Lattner5eccca42003-12-12 21:22:16 +0000[diff] [blame]548there isn't already one.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]549
Chris Lattner477a1fd2010-03-17 17:25:49 +0000[diff] [blame]550<ul>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]551<li>LLVM will not correctly compile on Solaris and/or OpenSolaris
552using the stock GCC 3.x.x series 'out the box',
Chris Lattner554ee4a2009-11-03 21:50:09 +0000[diff] [blame]553See: <a href="GettingStarted.html#brokengcc">Broken versions of GCC and other tools</a>.
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]554However, A <a href="http://pkg.auroraux.org/GCC">Modern GCC Build</a>
555for x86/x86-64 has been made available from the third party AuroraUX Project
556that has been meticulously tested for bootstrapping LLVM &amp; Clang.</li>
557</ul>
558
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]559</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]560
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]561<!-- ======================================================================= -->
562<div class="doc_subsection">
563 <a name="experimental">Experimental features included with this release</a>
564</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]565
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]566<div class="doc_text">
567
Misha Brukman6df9e2c2004-05-12 21:46:05 +0000[diff] [blame]568<p>The following components of this LLVM release are either untested, known to
569be broken or unreliable, or are in early development. These components should
570not be relied on, and bugs should not be filed against them, but they may be
571useful to some people. In particular, if you would like to work on one of these
Chris Lattner2b659ef2008-02-12 06:29:45 +0000[diff] [blame]572components, please contact us on the <a
573href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVMdev list</a>.</p>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]574
575<ul>
Wesley Peck7c4a1212010-03-18 14:31:30 +0000[diff] [blame]576<li>The MSIL, Alpha, SPU, MIPS, PIC16, Blackfin, MSP430, SystemZ and MicroBlaze
577 backends are experimental.</li>
Chris Lattner914ce462010-04-22 06:28:20 +0000[diff] [blame]578<li><tt>llc</tt> "<tt>-filetype=asm</tt>" (the default) is the only
Chris Lattner922d00f2010-07-21 15:57:40 +0000[diff] [blame]579 supported value for this option. XXX Update me</li>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]580</ul>
581
582</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]583
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]584<!-- ======================================================================= -->
585<div class="doc_subsection">
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]586 <a name="x86-be">Known problems with the X86 back-end</a>
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]587</div>
588
589<div class="doc_text">
590
591<ul>
Anton Korobeynikova6094be2008-06-08 10:24:13 +0000[diff] [blame]592 <li>The X86 backend does not yet support
593 all <a href="http://llvm.org/PR879">inline assembly that uses the X86
594 floating point stack</a>. It supports the 'f' and 't' constraints, but not
595 'u'.</li>
Duncan Sands47eff2b2008-06-08 19:38:43 +0000[diff] [blame]596 <li>Win64 code generation wasn't widely tested. Everything should work, but we
John Criswell524a5dd2009-03-02 15:28:15 +0000[diff] [blame]597 expect small issues to happen. Also, llvm-gcc cannot build the mingw64
Chris Lattner914ce462010-04-22 06:28:20 +0000[diff] [blame]598 runtime currently due to lack of support for the 'u' inline assembly
599 constraint and for X87 floating point inline assembly.</li>
Dan Gohman8207ba92008-06-08 23:05:11 +0000[diff] [blame]600 <li>The X86-64 backend does not yet support the LLVM IR instruction
Chris Lattner914ce462010-04-22 06:28:20 +0000[diff] [blame]601 <tt>va_arg</tt>. Currently, front-ends support variadic
Dan Gohman8207ba92008-06-08 23:05:11 +0000[diff] [blame]602 argument constructs on X86-64 by lowering them manually.</li>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]603</ul>
604
605</div>
606
607<!-- ======================================================================= -->
608<div class="doc_subsection">
609 <a name="ppc-be">Known problems with the PowerPC back-end</a>
610</div>
611
612<div class="doc_text">
613
614<ul>
Nicolas Geoffraye4285dc2007-05-15 09:21:28 +0000[diff] [blame]615<li>The Linux PPC32/ABI support needs testing for the interpreter and static
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]616compilation, and lacks support for debug information.</li>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]617</ul>
618
619</div>
620
621<!-- ======================================================================= -->
622<div class="doc_subsection">
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]623 <a name="arm-be">Known problems with the ARM back-end</a>
624</div>
625
626<div class="doc_text">
627
628<ul>
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]629<li>Thumb mode works only on ARMv6 or higher processors. On sub-ARMv6
Duncan Sandsc90d68b2007-09-26 15:59:54 +0000[diff] [blame]630processors, thumb programs can crash or produce wrong
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]631results (<a href="http://llvm.org/PR1388">PR1388</a>).</li>
John Criswell524a5dd2009-03-02 15:28:15 +0000[diff] [blame]632<li>Compilation for ARM Linux OABI (old ABI) is supported but not fully tested.
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]633</li>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]634</ul>
635
636</div>
637
638<!-- ======================================================================= -->
639<div class="doc_subsection">
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]640 <a name="sparc-be">Known problems with the SPARC back-end</a>
641</div>
642
643<div class="doc_text">
644
645<ul>
John Criswell524a5dd2009-03-02 15:28:15 +0000[diff] [blame]646<li>The SPARC backend only supports the 32-bit SPARC ABI (-m32); it does not
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]647 support the 64-bit SPARC ABI (-m64).</li>
648</ul>
649
650</div>
651
652<!-- ======================================================================= -->
653<div class="doc_subsection">
Bruno Cardoso Lopesb7e1a4f2008-10-25 14:56:26 +0000[diff] [blame]654 <a name="mips-be">Known problems with the MIPS back-end</a>
655</div>
656
657<div class="doc_text">
658
659<ul>
Bruno Cardoso Lopesb7e1a4f2008-10-25 14:56:26 +0000[diff] [blame]660<li>64-bit MIPS targets are not supported yet.</li>
661</ul>
662
663</div>
664
665<!-- ======================================================================= -->
666<div class="doc_subsection">
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]667 <a name="alpha-be">Known problems with the Alpha back-end</a>
668</div>
669
670<div class="doc_text">
671
672<ul>
673
674<li>On 21164s, some rare FP arithmetic sequences which may trap do not have the
675appropriate nops inserted to ensure restartability.</li>
676
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]677</ul>
678</div>
679
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]680<!-- ======================================================================= -->
681<div class="doc_subsection">
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]682 <a name="c-be">Known problems with the C back-end</a>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]683</div>
684
685<div class="doc_text">
686
687<ul>
Chris Lattner5733b272008-06-05 06:35:40 +0000[diff] [blame]688<li><a href="http://llvm.org/PR802">The C backend has only basic support for
689 inline assembly code</a>.</li>
Chris Lattner725a0d82007-09-26 06:01:35 +0000[diff] [blame]690<li><a href="http://llvm.org/PR1658">The C backend violates the ABI of common
691 C++ programs</a>, preventing intermixing between C++ compiled by the CBE and
Gabor Greif4906abe2009-03-02 12:02:51 +0000[diff] [blame]692 C++ code compiled with <tt>llc</tt> or native compilers.</li>
Duncan Sandsf74c0cc2008-02-10 13:40:55 +0000[diff] [blame]693<li>The C backend does not support all exception handling constructs.</li>
Duncan Sands50723a92009-02-25 11:51:54 +0000[diff] [blame]694<li>The C backend does not support arbitrary precision integers.</li>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]695</ul>
696
697</div>
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]698
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]699
700<!-- ======================================================================= -->
701<div class="doc_subsection">
Chris Lattnerc66bfef2010-03-17 04:41:49 +0000[diff] [blame]702 <a name="c-fe">Known problems with the llvm-gcc C and C++ front-end</a>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]703</div>
Chris Lattner47588f92003-10-02 05:07:23 +0000[diff] [blame]704
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]705<div class="doc_text">
Chris Lattnerc5d658a2006-03-03 00:34:26 +0000[diff] [blame]706
Chris Lattner5733b272008-06-05 06:35:40 +0000[diff] [blame]707<p>The only major language feature of GCC not supported by llvm-gcc is
708 the <tt>__builtin_apply</tt> family of builtins. However, some extensions
709 are only supported on some targets. For example, trampolines are only
Duncan Sands27aff872008-06-08 20:18:35 +0000[diff] [blame]710 supported on some targets (these are used when you take the address of a
711 nested function).</p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]712
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]713</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]714
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]715<!-- ======================================================================= -->
716<div class="doc_subsection">
Chris Lattner1eb4df62008-10-30 03:58:13 +0000[diff] [blame]717 <a name="fortran-fe">Known problems with the llvm-gcc Fortran front-end</a>
718</div>
719
720<div class="doc_text">
Gabor Greifba10fe02008-11-04 21:50:59 +0000[diff] [blame]721<ul>
Chris Lattner1eb4df62008-10-30 03:58:13 +0000[diff] [blame]722<li>Fortran support generally works, but there are still several unresolved bugs
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]723 in <a href="http://llvm.org/bugs/">Bugzilla</a>. Please see the
724 tools/gfortran component for details.</li>
Gabor Greifba10fe02008-11-04 21:50:59 +0000[diff] [blame]725</ul>
Chris Lattner1eb4df62008-10-30 03:58:13 +0000[diff] [blame]726</div>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]727
Chris Lattner2b659ef2008-02-12 06:29:45 +0000[diff] [blame]728<!-- ======================================================================= -->
729<div class="doc_subsection">
Chris Lattner5733b272008-06-05 06:35:40 +0000[diff] [blame]730 <a name="ada-fe">Known problems with the llvm-gcc Ada front-end</a>
Chris Lattner2b659ef2008-02-12 06:29:45 +0000[diff] [blame]731</div>
732
733<div class="doc_text">
John Criswell524a5dd2009-03-02 15:28:15 +0000[diff] [blame]734The llvm-gcc 4.2 Ada compiler works fairly well; however, this is not a mature
735technology, and problems should be expected.
Chris Lattner2b659ef2008-02-12 06:29:45 +0000[diff] [blame]736<ul>
Duncan Sands27aff872008-06-08 20:18:35 +0000[diff] [blame]737<li>The Ada front-end currently only builds on X86-32. This is mainly due
John Criswell524a5dd2009-03-02 15:28:15 +0000[diff] [blame]738to lack of trampoline support (pointers to nested functions) on other platforms.
739However, it <a href="http://llvm.org/PR2006">also fails to build on X86-64</a>
Chris Lattner2b659ef2008-02-12 06:29:45 +0000[diff] [blame]740which does support trampolines.</li>
741<li>The Ada front-end <a href="http://llvm.org/PR2007">fails to bootstrap</a>.
Duncan Sands326a4982009-02-25 11:59:06 +0000[diff] [blame]742This is due to lack of LLVM support for <tt>setjmp</tt>/<tt>longjmp</tt> style
743exception handling, which is used internally by the compiler.
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]744Workaround: configure with <tt>--disable-bootstrap</tt>.</li>
Duncan Sands978bcee2008-10-13 17:27:23 +0000[diff] [blame]745<li>The c380004, <a href="http://llvm.org/PR2010">c393010</a>
746and <a href="http://llvm.org/PR2421">cxg2021</a> ACATS tests fail
Duncan Sands326a4982009-02-25 11:59:06 +0000[diff] [blame]747(c380004 also fails with gcc-4.2 mainline).
748If the compiler is built with checks disabled then <a href="http://llvm.org/PR2010">c393010</a>
749causes the compiler to go into an infinite loop, using up all system memory.</li>
Duncan Sandsdd3e6722009-03-02 16:35:57 +0000[diff] [blame]750<li>Some GCC specific Ada tests continue to crash the compiler.</li>
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]751<li>The <tt>-E</tt> binder option (exception backtraces)
Chris Lattner2b659ef2008-02-12 06:29:45 +0000[diff] [blame]752<a href="http://llvm.org/PR1982">does not work</a> and will result in programs
Chris Lattner61358ab2009-10-13 17:48:04 +0000[diff] [blame]753crashing if an exception is raised. Workaround: do not use <tt>-E</tt>.</li>
Chris Lattner2b659ef2008-02-12 06:29:45 +0000[diff] [blame]754<li>Only discrete types <a href="http://llvm.org/PR1981">are allowed to start
755or finish at a non-byte offset</a> in a record. Workaround: do not pack records
756or use representation clauses that result in a field of a non-discrete type
757starting or finishing in the middle of a byte.</li>
Chris Lattnere6e1b352008-06-08 21:19:07 +0000[diff] [blame]758<li>The <tt>lli</tt> interpreter <a href="http://llvm.org/PR2009">considers
759'main' as generated by the Ada binder to be invalid</a>.
760Workaround: hand edit the file to use pointers for <tt>argv</tt> and
761<tt>envp</tt> rather than integers.</li>
762<li>The <tt>-fstack-check</tt> option <a href="http://llvm.org/PR2008">is
763ignored</a>.</li>
Chris Lattner2b659ef2008-02-12 06:29:45 +0000[diff] [blame]764</ul>
765</div>
766
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]767<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]768<div class="doc_section">
769 <a name="additionalinfo">Additional Information</a>
770</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]771<!-- *********************************************************************** -->
772
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]773<div class="doc_text">
774
Chris Lattner416db102005-05-16 17:13:10 +0000[diff] [blame]775<p>A wide variety of additional information is available on the <a
Chris Lattnerb4b0ce72007-05-18 00:44:29 +0000[diff] [blame]776href="http://llvm.org">LLVM web page</a>, in particular in the <a
777href="http://llvm.org/docs/">documentation</a> section. The web page also
Reid Spencer669ed452007-07-09 08:04:31 +0000[diff] [blame]778contains versions of the API documentation which is up-to-date with the
779Subversion version of the source code.
Misha Brukman109d9e82005-03-30 19:14:24 +0000[diff] [blame]780You can access versions of these documents specific to this release by going
781into the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]782
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]783<p>If you have any questions or comments about LLVM, please feel free to contact
Chris Lattnerc463b272005-10-29 07:07:09 +0000[diff] [blame]784us via the <a href="http://llvm.org/docs/#maillist"> mailing
Chris Lattner5eccca42003-12-12 21:22:16 +0000[diff] [blame]785lists</a>.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]786
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]787</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]788
789<!-- *********************************************************************** -->
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]790
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]791<hr>
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]792<address>
Misha Brukman38847d52003-12-21 22:53:21 +0000[diff] [blame]793 <a href="http://jigsaw.w3.org/css-validator/check/referer"><img
Misha Brukman44408702008-12-11 17:34:48 +0000[diff] [blame]794 src="http://jigsaw.w3.org/css-validator/images/vcss-blue" alt="Valid CSS"></a>
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]795 <a href="http://validator.w3.org/check/referer"><img
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Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]797
Chris Lattnerb4b0ce72007-05-18 00:44:29 +0000[diff] [blame]798 <a href="http://llvm.org/">LLVM Compiler Infrastructure</a><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]799 Last modified: $Date$
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]800</address>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]801
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]802</body>
803</html>