Gitiles
Code Review Sign In
gerrit-public.fairphone.software / fp2-dev / platform / external / llvm / 5c3389a084dfa2843c21cdda42b83a2dad785aec / . / docs / ReleaseNotes.html
blob: 610de1e4fa14b4b7bdc60a6de3ec99f84388cd73 [file] [log] [blame]
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
2 "http://www.w3.org/TR/html4/strict.dtd">
3<html>
4<head>
5 <link rel="stylesheet" href="llvm.css" type="text/css">
Chris Lattner5c3389a2004-08-16 00:20:18 +0000[diff] [blame^]6 <title>LLVM 1.4 Release Notes</title>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]7</head>
8<body>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]9
Chris Lattner5c3389a2004-08-16 00:20:18 +0000[diff] [blame^]10<div class="doc_title">LLVM 1.4 Release Notes</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]11
12<ol>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]13 <li><a href="#intro">Introduction</a></li>
14 <li><a href="#whatsnew">What's New?</a></li>
Chris Lattner4b538b92004-04-30 22:17:12 +0000[diff] [blame]15 <li><a href="GettingStarted.html">Installation Instructions</a></li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]16 <li><a href="#portability">Portability and Supported Platforms</a></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]17 <li><a href="#knownproblems">Known Problems</a>
18 <ul>
Chris Lattner2974b5b2004-04-01 00:41:31 +0000[diff] [blame]19 <li><a href="#experimental">Experimental features included in this
20 release</a>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]21 <li><a href="#core">Known problems with the LLVM Core</a>
22 <li><a href="#c-fe">Known problems with the C Front-end</a>
23 <li><a href="#c++-fe">Known problems with the C++ Front-end</a>
24 <li><a href="#x86-be">Known problems with the X86 Back-end</a>
Misha Brukmanadb1c392004-07-12 16:55:41 +0000[diff] [blame]25 <li><a href="#sparcv9-be">Known problems with the SparcV9 Back-end</a>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]26 <li><a href="#c-be">Known problems with the C back-end</a>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]27 </ul></li>
28 <li><a href="#additionalinfo">Additional Information</a></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]29</ol>
30
Chris Lattner7911ce22004-05-23 21:07:27 +0000[diff] [blame]31<div class="doc_author">
32 <p>Written by the <a href="http://llvm.cs.uiuc.edu">LLVM team</a><p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]33</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]34
35<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]36<div class="doc_section">
37 <a name="intro">Introduction</a>
38</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]39<!-- *********************************************************************** -->
40
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]41<div class="doc_text">
42
43<p>This document contains the release notes for the LLVM compiler
Chris Lattner5c3389a2004-08-16 00:20:18 +0000[diff] [blame^]44infrastructure, release 1.4. Here we describe the status of LLVM, including any
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]45known problems and bug fixes from the previous release. The most up-to-date
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]46version of this document can be found on the <a
Chris Lattner5c3389a2004-08-16 00:20:18 +0000[diff] [blame^]47href="http://llvm.cs.uiuc.edu/releases/1.4/">LLVM 1.4 web site</a>. If you are
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]48not reading this on the LLVM web pages, you should probably go there because
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]49this document may be updated after the release.</p>
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]50
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]51<p>For more information about LLVM, including information about potentially more
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]52current releases, please check out the <a href="http://llvm.cs.uiuc.edu">main
53web site</a>. If you have questions or comments, the <a
54href="http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVM developer's mailing
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]55list</a> is a good place to send them.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]56
Chris Lattner9e848092003-12-12 04:25:33 +0000[diff] [blame]57<p>Note that if you are reading this file from CVS, this document applies
58to the <i>next</i> release, not the current one. To see the release notes for
59the current or previous releases, see the <a
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]60href="http://llvm.cs.uiuc.edu/releases/">releases page</a>.</p>
61
62</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]63
64<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]65<div class="doc_section">
66 <a name="whatsnew">What's New?</a>
67</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]68<!-- *********************************************************************** -->
69
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]70<div class="doc_text">
71
Chris Lattner5c3389a2004-08-16 00:20:18 +0000[diff] [blame^]72<p>This is the fifth public release of the LLVM compiler infrastructure.</p>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]73
Misha Brukman6df9e2c2004-05-12 21:46:05 +0000[diff] [blame]74<p> At this time, LLVM is known to correctly compile and run all C &amp; C++
Chris Lattnerd5713882004-08-02 20:28:44 +0000[diff] [blame]75SPEC CPU95 &amp; 2000 benchmarks, the Olden benchmarks, and the Ptrdist
76benchmarks, and <b>many</b> other programs. LLVM now also works
77with a broad variety of C++ programs.</p>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]78
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]79</div>
80
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]81<!--=========================================================================-->
82<div class="doc_subsubsection">
Chris Lattnera39719f2004-02-25 16:36:51 +0000[diff] [blame]83<a name="newfeatures">This release implements the following new features:</a>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]84</div>
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]85
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]86<div class="doc_text">
87
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]88<ol>
Chris Lattner5c3389a2004-08-16 00:20:18 +0000[diff] [blame^]89<li></li>
Chris Lattner55ee0312003-11-19 22:05:38 +0000[diff] [blame]90</ol>
Chris Lattner0ef19062003-11-08 04:28:55 +0000[diff] [blame]91
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]92</div>
93
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]94
95<!--=========================================================================-->
96<div class="doc_subsubsection">
97In this release, the following missing features were implemented:
98</div>
Chris Lattner0ef19062003-11-08 04:28:55 +0000[diff] [blame]99
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]100<div class="doc_text">
101
Chris Lattner0ef19062003-11-08 04:28:55 +0000[diff] [blame]102<ol>
Chris Lattner5c3389a2004-08-16 00:20:18 +0000[diff] [blame^]103<li><a href="http://llvm.org/PR419">JIT interface should support arbitrary
104 calls</a></li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]105</ol>
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]106
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]107</div>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]108
109<!--=========================================================================-->
110<div class="doc_subsubsection">
Misha Brukmana7aadf12004-04-19 02:56:49 +0000[diff] [blame]111<a name="qualityofimp">In this release, the following Quality of Implementation
112issues were fixed:</a>
Chris Lattnere29ac162003-12-20 03:42:11 +0000[diff] [blame]113</div>
114
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]115<div class="doc_text">
116
Chris Lattnere29ac162003-12-20 03:42:11 +0000[diff] [blame]117<ol>
Chris Lattner5c3389a2004-08-16 00:20:18 +0000[diff] [blame^]118<li></li>
Chris Lattnere29ac162003-12-20 03:42:11 +0000[diff] [blame]119</ol>
120
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]121</div>
122
Chris Lattnere29ac162003-12-20 03:42:11 +0000[diff] [blame]123<!--=========================================================================-->
124<div class="doc_subsubsection">
Chris Lattnera39719f2004-02-25 16:36:51 +0000[diff] [blame]125In this release, the following build problems were fixed:
Brian Gaeke6b31beb2004-01-16 21:55:04 +0000[diff] [blame]126</div>
127
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]128<div class="doc_text">
Brian Gaeke6b31beb2004-01-16 21:55:04 +0000[diff] [blame]129<ol>
Chris Lattner5c3389a2004-08-16 00:20:18 +0000[diff] [blame^]130<li></li>
Brian Gaeke6b31beb2004-01-16 21:55:04 +0000[diff] [blame]131</ol>
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]132</div>
Brian Gaeke6b31beb2004-01-16 21:55:04 +0000[diff] [blame]133
134<!--=========================================================================-->
135<div class="doc_subsubsection">
Chris Lattner6e1ef192004-05-02 04:19:15 +0000[diff] [blame]136<a name="codequality">This release includes the following Code Quality
137improvements:</a>
Chris Lattneraab56d42004-05-23 20:42:08 +0000[diff] [blame]138</div>
Chris Lattner89ca2b82003-10-27 17:06:39 +0000[diff] [blame]139
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]140<div class="doc_text">
Chris Lattner89ca2b82003-10-27 17:06:39 +0000[diff] [blame]141<ol>
Chris Lattner5c3389a2004-08-16 00:20:18 +0000[diff] [blame^]142<li></li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]143</ol>
Reid Spencer8e0262f2004-05-23 17:23:13 +0000[diff] [blame]144</div>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]145
146<!--=========================================================================-->
147<div class="doc_subsubsection">
Misha Brukmana7aadf12004-04-19 02:56:49 +0000[diff] [blame]148<a name="bugfix">In this release, the following bugs in the previous release
149were fixed:</a>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]150</div>
151
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]152<div class="doc_text">
153
Chris Lattnerd5713882004-08-02 20:28:44 +0000[diff] [blame]154<p>Bugs fixed in the LLVM Core:</p>
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]155
156<ol>
Chris Lattner5c3389a2004-08-16 00:20:18 +0000[diff] [blame^]157<li></li>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]158</ol>
159
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]160<p>Bugs in the C/C++ front-end:</p>
161
162<ol>
Chris Lattner5c3389a2004-08-16 00:20:18 +0000[diff] [blame^]163<li></li>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]164</ol>
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]165</div>
Reid Spencer8e0262f2004-05-23 17:23:13 +0000[diff] [blame]166
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]167<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]168<div class="doc_section">
169 <a name="portability">Portability and Supported Platforms</a>
170</div>
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]171<!-- *********************************************************************** -->
172
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]173<div class="doc_text">
174
Chris Lattner4654bdb2004-06-01 18:22:41 +0000[diff] [blame]175<p>LLVM is known to work in the following platforms:</p>
176
177<ul>
178<li>Intel and AMD machines running Red Hat Linux and FreeBSD (and probably
179 other unix-like systems).</li>
180<li>Sun UltraSPARC workstations running Solaris 8.</li>
Chris Lattner4654bdb2004-06-01 18:22:41 +0000[diff] [blame]181<li>Intel and AMD machines running on Win32 with the Cygwin libraries.</li>
Chris Lattnere58d3562004-08-05 21:53:13 +0000[diff] [blame]182<li>PowerPC-based Mac OS X boxes, running 10.2 and above. Note that no JIT
183support is available yet, and LLC support is beta. The C backend can be used
184to produce stable code for this platform.</li>
Chris Lattner4654bdb2004-06-01 18:22:41 +0000[diff] [blame]185</ul>
186
Brian Gaekeb0fd7612004-05-09 05:28:35 +0000[diff] [blame]187<p>The core LLVM infrastructure uses
188<a href="http://www.gnu.org/software/autoconf/">GNU autoconf</a> to adapt itself
189to the machine and operating system on which it is built. However, minor
190porting may be required to get LLVM to work on new platforms. We welcome your
191portability patches and reports of successful builds or error messages.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]192
Chris Lattner4654bdb2004-06-01 18:22:41 +0000[diff] [blame]193<p>Note that the LLVM build system does not currently support directories with
194spaces on them when running on Win32/cygwin. We strongly recommend running
195LLVM and the C frontend out of a top-level directory without spaces (e.g.,
Chris Lattner74032a52004-06-01 19:41:30 +0000[diff] [blame]196<tt>/cygdrive/c/llvm</tt>). Also, make sure to install <b>all</b> of the
197cygwin packages. By default, many important tools are not installed that
198are needed by the LLVM build process or test suite (e.g., /bin/time).</p>
Chris Lattner4654bdb2004-06-01 18:22:41 +0000[diff] [blame]199
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]200</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]201
202<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]203<div class="doc_section">
204 <a name="knownproblems">Known Problems</a>
205</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]206<!-- *********************************************************************** -->
207
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]208<div class="doc_text">
209
210<p>This section contains all known problems with the LLVM system, listed by
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]211component. As new problems are discovered, they will be added to these
Chris Lattner5eccca42003-12-12 21:22:16 +0000[diff] [blame]212sections. If you run into a problem, please check the <a
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]213href="http://llvm.cs.uiuc.edu/bugs/">LLVM bug database</a> and submit a bug if
Chris Lattner5eccca42003-12-12 21:22:16 +0000[diff] [blame]214there isn't already one.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]215
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]216</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]217
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]218<!-- ======================================================================= -->
219<div class="doc_subsection">
220 <a name="experimental">Experimental features included with this release</a>
221</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]222
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]223<div class="doc_text">
224
Misha Brukman6df9e2c2004-05-12 21:46:05 +0000[diff] [blame]225<p>The following components of this LLVM release are either untested, known to
226be broken or unreliable, or are in early development. These components should
227not be relied on, and bugs should not be filed against them, but they may be
228useful to some people. In particular, if you would like to work on one of these
229components, please contact us on the llvmdev list.</p>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]230
231<ul>
Misha Brukman94118752004-08-05 21:04:03 +0000[diff] [blame]232<li>The PowerPC backend is incomplete and is known to miscompile several SPEC
233benchmarks. The file <tt>llvm/lib/Target/PowerPC/README.txt</tt> has
234details.</li>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]235<li>The following passes are incomplete or buggy: <tt>-pgmdep, -memdep,
Chris Lattnercbabe702004-06-28 00:44:45 +0000[diff] [blame]236 -ipmodref, -cee</tt></li>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]237<li>The <tt>-pre</tt> pass is incomplete (there are cases it doesn't handle that
238 it should) and not thoroughly tested.</li>
239<li>The <tt>llvm-ar</tt> tool is incomplete and probably buggy.</li>
240<li>The <tt>llvm-db</tt> tool is in a very early stage of development.</li>
241</ul>
242
243</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]244
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]245<!-- ======================================================================= -->
246<div class="doc_subsection">
247 <a name="core">Known problems with the LLVM Core</a>
248</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]249
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]250<div class="doc_text">
251
252<ul>
253
254<li>In the JIT, <tt>dlsym</tt> on a symbol compiled by the JIT will not
255work.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]256
257<li>The JIT does not use mutexes to protect its internal data structures. As
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]258such, execution of a threaded program could cause these data structures to be
259corrupted.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]260
Chris Lattnereb673962004-08-08 03:33:07 +0000[diff] [blame]261<li>Linking in static archive files (.a files) is slow (there is no symbol
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]262table in the archive).</li>
Chris Lattner2855ecd2003-11-04 20:06:53 +0000[diff] [blame]263
Misha Brukmana7aadf12004-04-19 02:56:49 +0000[diff] [blame]264<li>The gccld program <a href="http://llvm.cs.uiuc.edu/PR139">does not link
265objects/archives in the order specified on the command line.</a></li>
Chris Lattner2e6fcaf2004-02-15 23:09:07 +0000[diff] [blame]266
267<li><a href="http://llvm.cs.uiuc.edu/PR240">The lower-invoke pass does not mark
John Criswelld46c6962004-03-12 21:29:42 +0000[diff] [blame]268values live across a setjmp as volatile</a>. This missing feature only affects
Chris Lattner2e6fcaf2004-02-15 23:09:07 +0000[diff] [blame]269targets whose setjmp/longjmp libraries do not save and restore the entire
270register file.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]271</ul>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]272</div>
273
274<!-- ======================================================================= -->
275<div class="doc_subsection">
276 <a name="c-fe">Known problems with the C front-end</a>
277</div>
Chris Lattner47588f92003-10-02 05:07:23 +0000[diff] [blame]278
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]279<!-- _______________________________________________________________________ -->
Chris Lattnerb40efb32003-12-14 05:03:43 +0000[diff] [blame]280<div class="doc_subsubsection">Bugs</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]281
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]282<div class="doc_text">
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]283<ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]284<li>C99 Variable sized arrays do not release stack memory when they go out of
285 scope. Thus, the following program may run out of stack space:
286<pre>
287 for (i = 0; i != 1000000; ++i) {
288 int X[n];
289 foo(X);
290 }
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]291</pre></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]292
Misha Brukman6df9e2c2004-05-12 21:46:05 +0000[diff] [blame]293<li>Initialization of global union variables can only be done <a
294href="http://llvm.cs.uiuc.edu/bugs/show_bug.cgi?id=162">with the largest union
295member</a>.</li>
Chris Lattnerf580cdc2004-03-16 21:39:04 +0000[diff] [blame]296
Misha Brukmana7aadf12004-04-19 02:56:49 +0000[diff] [blame]297<li><a href="http://llvm.cs.uiuc.edu/PR244">[llvm-gcc] Error when an implicitly
298external function is re-declared as static</a></li>
Chris Lattnerf580cdc2004-03-16 21:39:04 +0000[diff] [blame]299
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]300</ul>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]301</div>
302
303<!-- _______________________________________________________________________ -->
304<div class="doc_subsubsection">
305 Notes
306</div>
307
308<div class="doc_text">
309
310<ul>
311
312<li>Inline assembly is not yet supported.</li>
Chris Lattnere01fcfb2003-10-27 18:30:37 +0000[diff] [blame]313
314<li>"long double" is transformed by the front-end into "double". There is no
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]315support for floating point data types of any size other than 32 and 64
316bits.</li>
317
318<li>The following Unix system functionality has not been tested and may not
319work:
Misha Brukmane0c891c2003-11-22 01:00:11 +0000[diff] [blame]320 <ol>
321 <li><tt>sigsetjmp</tt>, <tt>siglongjmp</tt> - These are not turned into the
322 appropriate <tt>invoke</tt>/<tt>unwind</tt> instructions. Note that
323 <tt>setjmp</tt> and <tt>longjmp</tt> <em>are</em> compiled correctly.
324 <li><tt>getcontext</tt>, <tt>setcontext</tt>, <tt>makecontext</tt>
325 - These functions have not been tested.
326 </ol></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]327
328<li>Although many GCC extensions are supported, some are not. In particular,
329 the following extensions are known to <b>not be</b> supported:
330 <ol>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]331 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Local-Labels.html#Local%20Labels">Local Labels</a>: Labels local to a block.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]332 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Nested-Functions.html#Nested%20Functions">Nested Functions</a>: As in Algol and Pascal, lexical scoping of functions.</li>
333 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Constructing-Calls.html#Constructing%20Calls">Constructing Calls</a>: Dispatching a call to another function.</li>
334 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Extended-Asm.html#Extended%20Asm">Extended Asm</a>: Assembler instructions with C expressions as operands.</li>
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]335 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Constraints.html#Constraints">Constraints</a>: Constraints for asm operands.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]336 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Asm-Labels.html#Asm%20Labels">Asm Labels</a>: Specifying the assembler name to use for a C symbol.</li>
337 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Explicit-Reg-Vars.html#Explicit%20Reg%20Vars">Explicit Reg Vars</a>: Defining variables residing in specified registers.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]338 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Vector-Extensions.html#Vector%20Extensions">Vector Extensions</a>: Using vector instructions through built-in functions.</li>
339 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Target-Builtins.html#Target%20Builtins">Target Builtins</a>: Built-in functions specific to particular targets.</li>
340 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Thread-Local.html#Thread-Local">Thread-Local</a>: Per-thread variables.</li>
341 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Pragmas.html#Pragmas">Pragmas</a>: Pragmas accepted by GCC.</li>
Misha Brukmane0c891c2003-11-22 01:00:11 +0000[diff] [blame]342 </ol>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]343
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]344 <p>The following GCC extensions are <b>partially</b> supported. An ignored
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]345 attribute means that the LLVM compiler ignores the presence of the attribute,
346 but the code should still work. An unsupported attribute is one which is
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]347 ignored by the LLVM compiler and will cause a different interpretation of
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]348 the program.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]349
350 <ol>
351 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Length.html#Variable%20Length">Variable Length</a>:
352 Arrays whose length is computed at run time.<br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]353 Supported, but allocated stack space is not freed until the function returns (noted above).</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]354
355 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html#Function%20Attributes">Function Attributes</a>:
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]356
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]357 Declaring that functions have no side effects or that they can never
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]358 return.<br>
359
360 <b>Supported:</b> <tt>format</tt>, <tt>format_arg</tt>, <tt>non_null</tt>,
361 <tt>constructor</tt>, <tt>destructor</tt>, <tt>unused</tt>,
362 <tt>deprecated</tt>, <tt>warn_unused_result</tt>, <tt>weak</tt><br>
363
364 <b>Ignored:</b> <tt>noreturn</tt>, <tt>noinline</tt>,
365 <tt>always_inline</tt>, <tt>pure</tt>, <tt>const</tt>, <tt>nothrow</tt>,
366 <tt>malloc</tt>, <tt>no_instrument_function</tt>, <tt>cdecl</tt><br>
367
368 <b>Unsupported:</b> <tt>used</tt>, <tt>section</tt>, <tt>alias</tt>,
369 <tt>visibility</tt>, <tt>regparm</tt>, <tt>stdcall</tt>,
370 <tt>fastcall</tt>, all other target specific attributes</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]371
372 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Attributes.html#Variable%20Attributes">Variable Attributes</a>:
373 Specifying attributes of variables.<br>
374 <b>Supported:</b> <tt>cleanup</tt>, <tt>common</tt>, <tt>nocommon</tt>,
375 <tt>deprecated</tt>, <tt>transparent_union</tt>,
376 <tt>unused</tt>, <tt>weak</tt><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]377
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]378 <b>Unsupported:</b> <tt>aligned</tt>, <tt>mode</tt>, <tt>packed</tt>,
379 <tt>section</tt>, <tt>shared</tt>, <tt>tls_model</tt>,
380 <tt>vector_size</tt>, <tt>dllimport</tt>,
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]381 <tt>dllexport</tt>, all target specific attributes.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]382
Misha Brukmanc4b7bee2003-12-12 04:37:31 +0000[diff] [blame]383 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Type-Attributes.html#Type%20Attributes">Type Attributes</a>: Specifying attributes of types.<br>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]384 <b>Supported:</b> <tt>transparent_union</tt>, <tt>unused</tt>,
Misha Brukmanc4b7bee2003-12-12 04:37:31 +0000[diff] [blame]385 <tt>deprecated</tt>, <tt>may_alias</tt><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]386
387 <b>Unsupported:</b> <tt>aligned</tt>, <tt>packed</tt>,
388 all target specific attributes.</li>
389
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]390 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html#Other%20Builtins">Other Builtins</a>:
391 Other built-in functions.<br>
392 We support all builtins which have a C language equivalent (e.g.,
393 <tt>__builtin_cos</tt>), <tt>__builtin_alloca</tt>,
394 <tt>__builtin_types_compatible_p</tt>, <tt>__builtin_choose_expr</tt>,
Chris Lattnerceebeb62004-06-18 06:26:29 +0000[diff] [blame]395 <tt>__builtin_constant_p</tt>, and <tt>__builtin_expect</tt>
396 (currently ignored). We also support builtins for ISO C99 floating
397 point comparison macros (e.g., <tt>__builtin_islessequal</tt>).</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]398 </ol>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]399
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]400 <p>The following extensions <b>are</b> known to be supported:</p>
401
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]402 <ol>
Chris Lattner7fe97dd2004-03-16 08:54:07 +0000[diff] [blame]403 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Labels-as-Values.html#Labels%20as%20Values">Labels as Values</a>: Getting pointers to labels and computed gotos.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]404 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html#Statement%20Exprs">Statement Exprs</a>: Putting statements and declarations inside expressions.</li>
405 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Typeof.html#Typeof">Typeof</a>: <code>typeof</code>: referring to the type of an expression.</li>
Tanya Lattnerca26c3e2004-06-22 03:48:17 +0000[diff] [blame]406 <li><a href="http://gcc.gnu.org/onlinedocs/gcc-3.4.0/gcc/Lvalues.html#Lvalues">Lvalues</a>: Using <code>?:</code>, "<code>,</code>" and casts in lvalues.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]407 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Conditionals.html#Conditionals">Conditionals</a>: Omitting the middle operand of a <code>?:</code> expression.</li>
408 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Long-Long.html#Long%20Long">Long Long</a>: Double-word integers.</li>
409 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Complex.html#Complex">Complex</a>: Data types for complex numbers.</li>
410 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Hex-Floats.html#Hex%20Floats">Hex Floats</a>:Hexadecimal floating-point constants.</li>
411 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html#Zero%20Length">Zero Length</a>: Zero-length arrays.</li>
412 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Empty-Structures.html#Empty%20Structures">Empty Structures</a>: Structures with no members.</li>
413 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variadic-Macros.html#Variadic%20Macros">Variadic Macros</a>: Macros with a variable number of arguments.</li>
414 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Escaped-Newlines.html#Escaped%20Newlines">Escaped Newlines</a>: Slightly looser rules for escaped newlines.</li>
415 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Subscripting.html#Subscripting">Subscripting</a>: Any array can be subscripted, even if not an lvalue.</li>
Misha Brukmanc4b7bee2003-12-12 04:37:31 +0000[diff] [blame]416 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Pointer-Arith.html#Pointer%20Arith">Pointer Arith</a>: Arithmetic on <code>void</code>-pointers and function pointers.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]417 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Initializers.html#Initializers">Initializers</a>: Non-constant initializers.</li>
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]418 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Compound-Literals.html#Compound%20Literals">Compound Literals</a>: Compound literals give structures, unions,
419or arrays as values.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]420 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Designated-Inits.html#Designated%20Inits">Designated Inits</a>: Labeling elements of initializers.</li>
Misha Brukmanc4b7bee2003-12-12 04:37:31 +0000[diff] [blame]421 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Cast-to-Union.html#Cast%20to%20Union">Cast to Union</a>: Casting to union type from any member of the union.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]422 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Case-Ranges.html#Case%20Ranges">Case Ranges</a>: `case 1 ... 9' and such.</li>
423 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Mixed-Declarations.html#Mixed%20Declarations">Mixed Declarations</a>: Mixing declarations and code.</li>
424 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Function-Prototypes.html#Function%20Prototypes">Function Prototypes</a>: Prototype declarations and old-style definitions.</li>
425 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/C---Comments.html#C++%20Comments">C++ Comments</a>: C++ comments are recognized.</li>
426 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Dollar-Signs.html#Dollar%20Signs">Dollar Signs</a>: Dollar sign is allowed in identifiers.</li>
427 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Character-Escapes.html#Character%20Escapes">Character Escapes</a>: <code>\e</code> stands for the character &lt;ESC&gt;.</li>
428 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Alignment.html#Alignment">Alignment</a>: Inquiring about the alignment of a type or variable.</li>
429 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Inline.html#Inline">Inline</a>: Defining inline functions (as fast as macros).</li>
430 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Alternate-Keywords.html#Alternate%20Keywords">Alternate Keywords</a>:<code>__const__</code>, <code>__asm__</code>, etc., for header files.</li>
431 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Incomplete-Enums.html#Incomplete%20Enums">Incomplete Enums</a>: <code>enum foo;</code>, with details to follow.</li>
432 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Function-Names.html#Function%20Names">Function Names</a>: Printable strings which are the name of the current function.</li>
Chris Lattner25795bc2004-02-14 04:08:29 +0000[diff] [blame]433 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Return-Address.html#Return%20Address">Return Address</a>: Getting the return or frame address of a function.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]434 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Unnamed-Fields.html#Unnamed%20Fields">Unnamed Fields</a>: Unnamed struct/union fields within structs/unions.</li>
435 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Attribute-Syntax.html#Attribute%20Syntax">Attribute Syntax</a>: Formal syntax for attributes.</li>
Misha Brukmane0c891c2003-11-22 01:00:11 +0000[diff] [blame]436 </ol></li>
437
438</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]439
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]440<p>If you run into GCC extensions which have not been included in any of these
441lists, please let us know (also including whether or not they work).</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]442
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]443</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]444
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]445<!-- ======================================================================= -->
446<div class="doc_subsection">
447 <a name="c++-fe">Known problems with the C++ front-end</a>
448</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]449
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]450<div class="doc_text">
451
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]452<p>For this release, the C++ front-end is considered to be fully functional but
Chris Lattner9e848092003-12-12 04:25:33 +0000[diff] [blame]453has not been tested as thoroughly as the C front-end. It has been tested and
454works for a number of non-trivial programs, but there may be lurking bugs.
455Please report any bugs or problems.</p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]456
457</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]458
459<!-- _______________________________________________________________________ -->
Chris Lattner3a51be12004-02-14 04:12:41 +0000[diff] [blame]460<div class="doc_subsubsection">Bugs</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]461
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]462<div class="doc_text">
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]463
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]464<ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]465<li>The C++ front-end inherits all problems afflicting the <a href="#c-fe">C
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]466 front-end</a>.</li>
Chris Lattner7962f712004-07-17 02:04:41 +0000[diff] [blame]467
Chris Lattnerd5713882004-08-02 20:28:44 +0000[diff] [blame]468<li><b>IA-64 specific</b>: The C++ front-end does not use <a
469href="http://llvm.cs.uiuc.edu/PR406">IA64 ABI compliant layout of v-tables</a>.
Chris Lattner7962f712004-07-17 02:04:41 +0000[diff] [blame]470In particular, it just stores function pointers instead of function
471descriptors in the vtable. This bug prevents mixing C++ code compiled with
Chris Lattner04db8082004-08-02 20:29:51 +0000[diff] [blame]472LLVM with C++ objects compiled by other C++ compilers.</li>
Chris Lattner7962f712004-07-17 02:04:41 +0000[diff] [blame]473
Chris Lattnerd5713882004-08-02 20:28:44 +0000[diff] [blame]474</ul>
475
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]476</div>
477
478<!-- _______________________________________________________________________ -->
479<div class="doc_subsubsection">
480 Notes
481</div>
482
483<div class="doc_text">
484
485<ul>
Chris Lattnere01fcfb2003-10-27 18:30:37 +0000[diff] [blame]486
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]487<li>The C++ front-end is based on a pre-release of the GCC 3.4 C++ parser. This
488parser is significantly more standards compliant (and picky) than prior GCC
489versions. For more information, see the C++ section of the <a
Chris Lattner9e848092003-12-12 04:25:33 +0000[diff] [blame]490href="http://gcc.gnu.org/gcc-3.4/changes.html">GCC 3.4 release notes</a>.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]491
492<li>Destructors for local objects are not always run when a <tt>longjmp</tt> is
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]493 performed. In particular, destructors for objects in the <tt>longjmp</tt>ing
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]494 function and in the <tt>setjmp</tt> receiver function may not be run.
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]495 Objects in intervening stack frames will be destroyed, however (which is
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]496 better than most compilers).</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]497
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]498<li>The LLVM C++ front-end follows the <a
499 href="http://www.codesourcery.com/cxx-abi">Itanium C++ ABI</a>.
500 This document, which is not Itanium specific, specifies a standard for name
501 mangling, class layout, v-table layout, RTTI formats, and other C++
502 representation issues. Because we use this API, code generated by the LLVM
503 compilers should be binary compatible with machine code generated by other
504 Itanium ABI C++ compilers (such as G++, the Intel and HP compilers, etc).
505 <i>However</i>, the exception handling mechanism used by LLVM is very
506 different from the model used in the Itanium ABI, so <b>exceptions will not
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]507 interact correctly</b>. </li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]508
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]509</ul>
Chris Lattnerfcc54b32003-10-07 22:14:37 +0000[diff] [blame]510
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]511</div>
512
513<!-- ======================================================================= -->
514<div class="doc_subsection">
515 <a name="x86-be">Known problems with the X86 back-end</a>
516</div>
517
518<div class="doc_text">
519
520<ul>
Chris Lattnerd5713882004-08-02 20:28:44 +0000[diff] [blame]521 <li>none yet</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]522</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]523
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]524</div>
525
526<!-- ======================================================================= -->
527<div class="doc_subsection">
Misha Brukmanadb1c392004-07-12 16:55:41 +0000[diff] [blame]528 <a name="sparcv9-be">Known problems with the SparcV9 back-end</a>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]529</div>
530
531<div class="doc_text">
532
533<ul>
Misha Brukmanadb1c392004-07-12 16:55:41 +0000[diff] [blame]534<li><a href="http://llvm.cs.uiuc.edu/PR60">[sparcv9] SparcV9 backend miscompiles
535several programs in the LLVM test suite</a></li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]536</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]537
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]538</div>
539
540<!-- ======================================================================= -->
541<div class="doc_subsection">
542 <a name="c-be">Known problems with the C back-end</a>
543</div>
544
545<div class="doc_text">
546
547<ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]548
549<li>The C back-end produces code that violates the ANSI C Type-Based Alias
550Analysis rules. As such, special options may be necessary to compile the code
551(for example, GCC requires the <tt>-fno-strict-aliasing</tt> option). This
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]552problem probably cannot be fixed.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]553
Chris Lattnere84843b2003-10-20 19:05:03 +0000[diff] [blame]554<li><a href="http://llvm.cs.uiuc.edu/PR33">Initializers for global variables</a>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]555cannot include special floating point numbers like Not-A-Number or
556Infinity.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]557
Chris Lattner2855ecd2003-11-04 20:06:53 +0000[diff] [blame]558<li><a href="http://llvm.cs.uiuc.edu/PR56">Zero arg vararg functions are not
Chris Lattner2af46052003-10-24 04:03:19 +0000[diff] [blame]559supported</a>. This should not affect LLVM produced by the C or C++
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]560frontends.</li>
Chris Lattner2af46052003-10-24 04:03:19 +0000[diff] [blame]561
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]562</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]563
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]564</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]565
566<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]567<div class="doc_section">
568 <a name="additionalinfo">Additional Information</a>
569</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]570<!-- *********************************************************************** -->
571
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]572<div class="doc_text">
573
574<p>A wide variety of additional information is available on the LLVM web page,
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]575including mailing lists and publications describing algorithms and components
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]576implemented in LLVM. The web page also contains versions of the API
577documentation which is up-to-date with the CVS version of the source code. You
578can access versions of these documents specific to this release by going into
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]579the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]580
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]581<p>If you have any questions or comments about LLVM, please feel free to contact
Chris Lattner5eccca42003-12-12 21:22:16 +0000[diff] [blame]582us via the <a href="http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev">mailing
583lists</a>.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]584
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]585</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]586
587<!-- *********************************************************************** -->
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]588
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]589<hr>
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]590<address>
Misha Brukman38847d52003-12-21 22:53:21 +0000[diff] [blame]591 <a href="http://jigsaw.w3.org/css-validator/check/referer"><img
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]592 src="http://jigsaw.w3.org/css-validator/images/vcss" alt="Valid CSS!"></a>
593 <a href="http://validator.w3.org/check/referer"><img
594 src="http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01!" /></a>
595
Misha Brukmane0c891c2003-11-22 01:00:11 +0000[diff] [blame]596 <a href="http://llvm.cs.uiuc.edu">The LLVM Compiler Infrastructure</a><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]597 Last modified: $Date$
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]598</address>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]599
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]600</body>
601</html>