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gerrit-public.fairphone.software / toolchain / llvm-project / f30c73c7aac6d54b9c0839b1836ba79a58fb6d65 / . / llvm / docs / ReleaseNotes.html
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4<head>
Reid Spencere4190fa2004-11-18 18:38:58 +0000[diff] [blame]5 <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]6 <link rel="stylesheet" href="llvm.css" type="text/css">
John Criswellfee5f112005-05-18 20:28:46 +0000[diff] [blame]7 <title>LLVM 1.6 Release Notes</title>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]8</head>
9<body>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]10
John Criswellfee5f112005-05-18 20:28:46 +0000[diff] [blame]11<div class="doc_title">LLVM 1.6 Release Notes</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]12
13<ol>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]14 <li><a href="#intro">Introduction</a></li>
15 <li><a href="#whatsnew">What's New?</a></li>
Chris Lattner77a51732004-04-30 22:17:12 +0000[diff] [blame]16 <li><a href="GettingStarted.html">Installation Instructions</a></li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]17 <li><a href="#portability">Portability and Supported Platforms</a></li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]18 <li><a href="#knownproblems">Known Problems</a>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]19 <li><a href="#additionalinfo">Additional Information</a></li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]20</ol>
21
Chris Lattner020e1fc2004-05-23 21:07:27 +0000[diff] [blame]22<div class="doc_author">
Chris Lattnerf3a7c242004-12-09 22:22:58 +0000[diff] [blame]23 <p>Written by the <a href="http://llvm.cs.uiuc.edu">LLVM Team</a><p>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]24</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]25
26<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]27<div class="doc_section">
28 <a name="intro">Introduction</a>
29</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]30<!-- *********************************************************************** -->
31
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]32<div class="doc_text">
33
34<p>This document contains the release notes for the LLVM compiler
John Criswellfee5f112005-05-18 20:28:46 +0000[diff] [blame]35infrastructure, release 1.6. Here we describe the status of LLVM, including any
Chris Lattner406bddf2005-05-15 05:44:51 +0000[diff] [blame]36known problems and major improvements from the previous release. The most
37up-to-date version of this document can be found on the <a
John Criswellfee5f112005-05-18 20:28:46 +0000[diff] [blame]38href="http://llvm.cs.uiuc.edu/releases/1.6/">LLVM 1.6 web site</a>. If you are
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]39not reading this on the LLVM web pages, you should probably go there because
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]40this document may be updated after the release.</p>
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]41
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]42<p>For more information about LLVM, including information about the latest
43release, please check out the <a href="http://llvm.cs.uiuc.edu">main LLVM
Chris Lattnere7525b52003-10-07 21:38:31 +0000[diff] [blame]44web site</a>. If you have questions or comments, the <a
45href="http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVM developer's mailing
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]46list</a> is a good place to send them.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]47
Chris Lattnerf3a7c242004-12-09 22:22:58 +0000[diff] [blame]48<p>Note that if you are reading this file from CVS or the main LLVM web page,
49this document applies to the <i>next</i> release, not the current one. To see
50the release notes for the current or previous releases, see the <a
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]51href="http://llvm.cs.uiuc.edu/releases/">releases page</a>.</p>
52
53</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]54
55<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]56<div class="doc_section">
57 <a name="whatsnew">What's New?</a>
58</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]59<!-- *********************************************************************** -->
60
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]61<div class="doc_text">
62
John Criswellfee5f112005-05-18 20:28:46 +0000[diff] [blame]63<p>This is the seventh public release of the LLVM Compiler Infrastructure.</p>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]64
John Criswellfee5f112005-05-18 20:28:46 +0000[diff] [blame]65<p>LLVM 1.6 is known to correctly compile a wide range of C and C++ programs,
66includes bug fixes for those problems found since the 1.5 release, and includes
Chris Lattner7e1f2622005-05-16 16:56:09 +0000[diff] [blame]67a large number of new features and enhancements, described below.</p>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]68
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]69</div>
70
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]71<!--=========================================================================-->
Chris Lattner406bddf2005-05-15 05:44:51 +0000[diff] [blame]72<div class="doc_subsection">
John Criswellfee5f112005-05-18 20:28:46 +0000[diff] [blame]73<a name="newfeatures">New Features in LLVM 1.6</a>
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]74</div>
Brian Gaeke8b05e4f2004-01-16 21:55:04 +0000[diff] [blame]75
Chris Lattnerf30c73c2005-05-18 22:23:56 +0000[diff] [blame^]76<div class="doc_text">
77<h1>
78 See <a href="/releases/1.5/docs/ReleaseNotes.html">LLVM 1.5 Release Notes</a>
79</h1>
80</div>
81
Brian Gaeke8b05e4f2004-01-16 21:55:04 +0000[diff] [blame]82<!--=========================================================================-->
Chris Lattner406bddf2005-05-15 05:44:51 +0000[diff] [blame]83<div class="doc_subsection">
John Criswellfee5f112005-05-18 20:28:46 +0000[diff] [blame]84<a name="codequality">Code Quality Improvements in LLVM 1.6</a>
Chris Lattner23257062004-05-23 20:42:08 +0000[diff] [blame]85</div>
Chris Lattner639579c2003-10-27 17:06:39 +0000[diff] [blame]86
Chris Lattner7e1f2622005-05-16 16:56:09 +0000[diff] [blame]87<!--=========================================================================-->
88<div class="doc_subsection">
John Criswellfee5f112005-05-18 20:28:46 +0000[diff] [blame]89<a name="codequality">Code Generator Improvements in LLVM 1.6</a>
Chris Lattner7e1f2622005-05-16 16:56:09 +0000[diff] [blame]90</div>
91
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]92<!--=========================================================================-->
Chris Lattner406bddf2005-05-15 05:44:51 +0000[diff] [blame]93<div class="doc_subsection">
John Criswellfee5f112005-05-18 20:28:46 +0000[diff] [blame]94<a name="bugfix">Significant Bugs Fixed in LLVM 1.6</a>
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]95</div>
Reid Spencer3e58f582004-05-23 17:23:13 +0000[diff] [blame]96
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]97<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]98<div class="doc_section">
99 <a name="portability">Portability and Supported Platforms</a>
100</div>
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]101<!-- *********************************************************************** -->
102
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]103<div class="doc_text">
104
John Criswell64307722004-12-08 20:35:47 +0000[diff] [blame]105<p>LLVM is known to work on the following platforms:</p>
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]106
107<ul>
Reid Spencer9803b402005-05-17 02:47:27 +0000[diff] [blame]108 <li>Intel and AMD machines running Red Hat Linux, Fedora Core and FreeBSD
109 (and probably other unix-like systems).</li>
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]110<li>Sun UltraSPARC workstations running Solaris 8.</li>
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]111<li>Intel and AMD machines running on Win32 with the Cygwin libraries (limited
112 support is available for native builds with Visual C++).</li>
113<li>PowerPC-based Mac OS X systems, running 10.2 and above.</li>
John Criswelld5234922005-05-13 20:28:15 +0000[diff] [blame]114<li>Alpha-based machines running Debian GNU/Linux.</li>
115<li>Itanium-based machines running Linux and HP-UX.</li>
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]116</ul>
117
Brian Gaekee3e557e2004-05-09 05:28:35 +0000[diff] [blame]118<p>The core LLVM infrastructure uses
119<a href="http://www.gnu.org/software/autoconf/">GNU autoconf</a> to adapt itself
120to the machine and operating system on which it is built. However, minor
121porting may be required to get LLVM to work on new platforms. We welcome your
122portability patches and reports of successful builds or error messages.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]123
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]124</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]125
126<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]127<div class="doc_section">
128 <a name="knownproblems">Known Problems</a>
129</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]130<!-- *********************************************************************** -->
131
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]132<div class="doc_text">
133
134<p>This section contains all known problems with the LLVM system, listed by
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]135component. As new problems are discovered, they will be added to these
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]136sections. If you run into a problem, please check the <a
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]137href="http://llvm.cs.uiuc.edu/bugs/">LLVM bug database</a> and submit a bug if
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]138there isn't already one.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]139
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]140</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]141
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]142<!-- ======================================================================= -->
143<div class="doc_subsection">
144 <a name="experimental">Experimental features included with this release</a>
145</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]146
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]147<div class="doc_text">
148
Misha Brukmanfa50a222004-05-12 21:46:05 +0000[diff] [blame]149<p>The following components of this LLVM release are either untested, known to
150be broken or unreliable, or are in early development. These components should
151not be relied on, and bugs should not be filed against them, but they may be
152useful to some people. In particular, if you would like to work on one of these
153components, please contact us on the llvmdev list.</p>
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]154
155<ul>
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]156<li>The following passes are incomplete or buggy, and may be removed in future
Chris Lattner38389b12005-01-28 06:13:52 +0000[diff] [blame]157 releases: <tt>-cee, -branch-combine, -instloops, -paths, -pre</tt></li>
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]158<li>The <tt>llvm-db</tt> tool is in a very early stage of development, but can
159 be used to step through programs and inspect the stack.</li>
Misha Brukman96158092005-03-30 19:14:24 +0000[diff] [blame]160<li>The "iterative scan" register allocator (enabled with
161 <tt>-regalloc=iterativescan</tt>) is not stable.</li>
John Criswelld5234922005-05-13 20:28:15 +0000[diff] [blame]162<li>The SparcV8, Alpha, and IA64 code generators are experimental.</li>
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]163</ul>
164
165</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]166
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]167<!-- ======================================================================= -->
168<div class="doc_subsection">
169 <a name="core">Known problems with the LLVM Core</a>
170</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]171
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]172<div class="doc_text">
173
174<ul>
Misha Brukman96158092005-03-30 19:14:24 +0000[diff] [blame]175 <li>In the JIT, <tt>dlsym()</tt> on a symbol compiled by the JIT will not
176 work.</li>
Reid Spencer493d9c22004-11-25 22:38:30 +0000[diff] [blame]177 <li>The JIT does not use mutexes to protect its internal data structures. As
178 such, execution of a threaded program could cause these data structures to be
179 corrupted.
180 </li>
Reid Spencer493d9c22004-11-25 22:38:30 +0000[diff] [blame]181 <li><a href="http://llvm.cs.uiuc.edu/PR240">The lower-invoke pass does not
182 mark values live across a setjmp as volatile</a>. This missing feature
183 only affects targets whose setjmp/longjmp libraries do not save and restore
184 the entire register file.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]185</ul>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]186</div>
187
188<!-- ======================================================================= -->
189<div class="doc_subsection">
190 <a name="c-fe">Known problems with the C front-end</a>
191</div>
Chris Lattner178f3db2003-10-02 05:07:23 +0000[diff] [blame]192
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]193<!-- _______________________________________________________________________ -->
Chris Lattner5a8a7282003-12-14 05:03:43 +0000[diff] [blame]194<div class="doc_subsubsection">Bugs</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]195
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]196<div class="doc_text">
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]197<ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]198<li>C99 Variable sized arrays do not release stack memory when they go out of
199 scope. Thus, the following program may run out of stack space:
200<pre>
201 for (i = 0; i != 1000000; ++i) {
202 int X[n];
203 foo(X);
204 }
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]205</pre></li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]206
Misha Brukmanfa50a222004-05-12 21:46:05 +0000[diff] [blame]207<li>Initialization of global union variables can only be done <a
Misha Brukman68ef9a92004-12-04 00:45:09 +0000[diff] [blame]208href="http://llvm.cs.uiuc.edu/PR162">with the largest union member</a>.</li>
Chris Lattner1ab58dd2004-03-16 21:39:04 +0000[diff] [blame]209
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]210</ul>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]211</div>
212
213<!-- _______________________________________________________________________ -->
214<div class="doc_subsubsection">
215 Notes
216</div>
217
218<div class="doc_text">
219
220<ul>
221
222<li>Inline assembly is not yet supported.</li>
Chris Lattnerd2a74272003-10-27 18:30:37 +0000[diff] [blame]223
224<li>"long double" is transformed by the front-end into "double". There is no
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]225support for floating point data types of any size other than 32 and 64
226bits.</li>
227
228<li>The following Unix system functionality has not been tested and may not
229work:
Misha Brukman7cb4e382003-11-22 01:00:11 +0000[diff] [blame]230 <ol>
231 <li><tt>sigsetjmp</tt>, <tt>siglongjmp</tt> - These are not turned into the
232 appropriate <tt>invoke</tt>/<tt>unwind</tt> instructions. Note that
233 <tt>setjmp</tt> and <tt>longjmp</tt> <em>are</em> compiled correctly.
234 <li><tt>getcontext</tt>, <tt>setcontext</tt>, <tt>makecontext</tt>
235 - These functions have not been tested.
236 </ol></li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]237
238<li>Although many GCC extensions are supported, some are not. In particular,
239 the following extensions are known to <b>not be</b> supported:
240 <ol>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]241 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Local-Labels.html#Local%20Labels">Local Labels</a>: Labels local to a block.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]242 <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>
243 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Constructing-Calls.html#Constructing%20Calls">Constructing Calls</a>: Dispatching a call to another function.</li>
244 <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 Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]245 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Constraints.html#Constraints">Constraints</a>: Constraints for asm operands.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]246 <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>
247 <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 Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]248 <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>
249 <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>
Tanya Lattner63371342004-12-08 18:25:34 +0000[diff] [blame]250 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Thread_002dLocal.html">Thread-Local</a>: Per-thread variables.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]251 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Pragmas.html#Pragmas">Pragmas</a>: Pragmas accepted by GCC.</li>
Misha Brukman7cb4e382003-11-22 01:00:11 +0000[diff] [blame]252 </ol>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]253
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]254 <p>The following GCC extensions are <b>partially</b> supported. An ignored
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]255 attribute means that the LLVM compiler ignores the presence of the attribute,
256 but the code should still work. An unsupported attribute is one which is
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]257 ignored by the LLVM compiler and will cause a different interpretation of
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]258 the program.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]259
260 <ol>
261 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Length.html#Variable%20Length">Variable Length</a>:
262 Arrays whose length is computed at run time.<br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]263 Supported, but allocated stack space is not freed until the function returns (noted above).</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]264
265 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html#Function%20Attributes">Function Attributes</a>:
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]266
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]267 Declaring that functions have no side effects or that they can never
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]268 return.<br>
269
270 <b>Supported:</b> <tt>format</tt>, <tt>format_arg</tt>, <tt>non_null</tt>,
John Criswell64307722004-12-08 20:35:47 +0000[diff] [blame]271 <tt>noreturn</tt>, <tt>constructor</tt>, <tt>destructor</tt>,
272 <tt>unused</tt>,
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]273 <tt>deprecated</tt>, <tt>warn_unused_result</tt>, <tt>weak</tt><br>
274
John Criswell64307722004-12-08 20:35:47 +0000[diff] [blame]275 <b>Ignored:</b> <tt>noinline</tt>,
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]276 <tt>always_inline</tt>, <tt>pure</tt>, <tt>const</tt>, <tt>nothrow</tt>,
277 <tt>malloc</tt>, <tt>no_instrument_function</tt>, <tt>cdecl</tt><br>
278
279 <b>Unsupported:</b> <tt>used</tt>, <tt>section</tt>, <tt>alias</tt>,
280 <tt>visibility</tt>, <tt>regparm</tt>, <tt>stdcall</tt>,
281 <tt>fastcall</tt>, all other target specific attributes</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]282
283 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Attributes.html#Variable%20Attributes">Variable Attributes</a>:
284 Specifying attributes of variables.<br>
285 <b>Supported:</b> <tt>cleanup</tt>, <tt>common</tt>, <tt>nocommon</tt>,
286 <tt>deprecated</tt>, <tt>transparent_union</tt>,
287 <tt>unused</tt>, <tt>weak</tt><br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]288
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]289 <b>Unsupported:</b> <tt>aligned</tt>, <tt>mode</tt>, <tt>packed</tt>,
290 <tt>section</tt>, <tt>shared</tt>, <tt>tls_model</tt>,
291 <tt>vector_size</tt>, <tt>dllimport</tt>,
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]292 <tt>dllexport</tt>, all target specific attributes.</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]293
Misha Brukman8395d732003-12-12 04:37:31 +0000[diff] [blame]294 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Type-Attributes.html#Type%20Attributes">Type Attributes</a>: Specifying attributes of types.<br>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]295 <b>Supported:</b> <tt>transparent_union</tt>, <tt>unused</tt>,
Misha Brukman8395d732003-12-12 04:37:31 +0000[diff] [blame]296 <tt>deprecated</tt>, <tt>may_alias</tt><br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]297
298 <b>Unsupported:</b> <tt>aligned</tt>, <tt>packed</tt>,
299 all target specific attributes.</li>
300
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]301 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html#Other%20Builtins">Other Builtins</a>:
302 Other built-in functions.<br>
303 We support all builtins which have a C language equivalent (e.g.,
304 <tt>__builtin_cos</tt>), <tt>__builtin_alloca</tt>,
305 <tt>__builtin_types_compatible_p</tt>, <tt>__builtin_choose_expr</tt>,
Chris Lattnerb7c4bac2004-06-18 06:26:29 +0000[diff] [blame]306 <tt>__builtin_constant_p</tt>, and <tt>__builtin_expect</tt>
307 (currently ignored). We also support builtins for ISO C99 floating
Chris Lattnerb34b2732005-05-07 02:21:21 +0000[diff] [blame]308 point comparison macros (e.g., <tt>__builtin_islessequal</tt>),
309 <tt>__builtin_prefetch</tt>, <tt>__builtin_popcount[ll]</tt>,
310 <tt>__builtin_clz[ll]</tt>, and <tt>__builtin_ctz[ll]</tt>.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]311 </ol>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]312
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]313 <p>The following extensions <b>are</b> known to be supported:</p>
314
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]315 <ol>
Chris Lattnerd3dc8502004-03-16 08:54:07 +0000[diff] [blame]316 <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 Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]317 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html#Statement%20Exprs">Statement Exprs</a>: Putting statements and declarations inside expressions.</li>
318 <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 Lattnerce33a1b2004-06-22 03:48:17 +0000[diff] [blame]319 <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 Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]320 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Conditionals.html#Conditionals">Conditionals</a>: Omitting the middle operand of a <code>?:</code> expression.</li>
321 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Long-Long.html#Long%20Long">Long Long</a>: Double-word integers.</li>
322 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Complex.html#Complex">Complex</a>: Data types for complex numbers.</li>
323 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Hex-Floats.html#Hex%20Floats">Hex Floats</a>:Hexadecimal floating-point constants.</li>
324 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html#Zero%20Length">Zero Length</a>: Zero-length arrays.</li>
325 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Empty-Structures.html#Empty%20Structures">Empty Structures</a>: Structures with no members.</li>
326 <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>
327 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Escaped-Newlines.html#Escaped%20Newlines">Escaped Newlines</a>: Slightly looser rules for escaped newlines.</li>
328 <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 Brukman8395d732003-12-12 04:37:31 +0000[diff] [blame]329 <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 Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]330 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Initializers.html#Initializers">Initializers</a>: Non-constant initializers.</li>
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]331 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Compound-Literals.html#Compound%20Literals">Compound Literals</a>: Compound literals give structures, unions,
332or arrays as values.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]333 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Designated-Inits.html#Designated%20Inits">Designated Inits</a>: Labeling elements of initializers.</li>
Misha Brukman8395d732003-12-12 04:37:31 +0000[diff] [blame]334 <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 Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]335 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Case-Ranges.html#Case%20Ranges">Case Ranges</a>: `case 1 ... 9' and such.</li>
336 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Mixed-Declarations.html#Mixed%20Declarations">Mixed Declarations</a>: Mixing declarations and code.</li>
337 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Function-Prototypes.html#Function%20Prototypes">Function Prototypes</a>: Prototype declarations and old-style definitions.</li>
Tanya Lattner7591b822004-12-08 18:29:38 +0000[diff] [blame]338 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/C_002b_002b-Comments.html#C_002b_002b-Comments">C++ Comments</a>: C++ comments are recognized.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]339 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Dollar-Signs.html#Dollar%20Signs">Dollar Signs</a>: Dollar sign is allowed in identifiers.</li>
340 <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>
341 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Alignment.html#Alignment">Alignment</a>: Inquiring about the alignment of a type or variable.</li>
342 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Inline.html#Inline">Inline</a>: Defining inline functions (as fast as macros).</li>
343 <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>
344 <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>
345 <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 Lattner3646dad2004-02-14 04:08:29 +0000[diff] [blame]346 <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 Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]347 <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>
348 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Attribute-Syntax.html#Attribute%20Syntax">Attribute Syntax</a>: Formal syntax for attributes.</li>
Misha Brukman7cb4e382003-11-22 01:00:11 +0000[diff] [blame]349 </ol></li>
350
351</ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]352
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]353<p>If you run into GCC extensions which have not been included in any of these
354lists, please let us know (also including whether or not they work).</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]355
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]356</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]357
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]358<!-- ======================================================================= -->
359<div class="doc_subsection">
360 <a name="c++-fe">Known problems with the C++ front-end</a>
361</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]362
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]363<div class="doc_text">
364
Reid Spencer55684c32004-12-07 08:39:08 +0000[diff] [blame]365<p>For this release, the C++ front-end is considered to be fully
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]366tested and works for a number of non-trivial programs, including LLVM
367itself.</p>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]368
369</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]370
371<!-- _______________________________________________________________________ -->
Chris Lattner141ebb62004-02-14 04:12:41 +0000[diff] [blame]372<div class="doc_subsubsection">Bugs</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]373
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]374<div class="doc_text">
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]375
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]376<ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]377<li>The C++ front-end inherits all problems afflicting the <a href="#c-fe">C
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]378 front-end</a>.</li>
Chris Lattner041e6c92004-07-17 02:04:41 +0000[diff] [blame]379
Chris Lattner5cd40922004-08-02 20:28:44 +0000[diff] [blame]380</ul>
381
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]382</div>
383
384<!-- _______________________________________________________________________ -->
385<div class="doc_subsubsection">
386 Notes
387</div>
388
389<div class="doc_text">
390
391<ul>
Chris Lattnerd2a74272003-10-27 18:30:37 +0000[diff] [blame]392
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]393<li>The C++ front-end is based on a pre-release of the GCC 3.4 C++ parser. This
394parser is significantly more standards compliant (and picky) than prior GCC
395versions. For more information, see the C++ section of the <a
Chris Lattnere76e9ab2003-12-12 04:25:33 +0000[diff] [blame]396href="http://gcc.gnu.org/gcc-3.4/changes.html">GCC 3.4 release notes</a>.</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]397
398<li>Destructors for local objects are not always run when a <tt>longjmp</tt> is
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]399 performed. In particular, destructors for objects in the <tt>longjmp</tt>ing
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]400 function and in the <tt>setjmp</tt> receiver function may not be run.
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]401 Objects in intervening stack frames will be destroyed, however (which is
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]402 better than most compilers).</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]403
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]404<li>The LLVM C++ front-end follows the <a
405 href="http://www.codesourcery.com/cxx-abi">Itanium C++ ABI</a>.
406 This document, which is not Itanium specific, specifies a standard for name
407 mangling, class layout, v-table layout, RTTI formats, and other C++
408 representation issues. Because we use this API, code generated by the LLVM
409 compilers should be binary compatible with machine code generated by other
410 Itanium ABI C++ compilers (such as G++, the Intel and HP compilers, etc).
411 <i>However</i>, the exception handling mechanism used by LLVM is very
412 different from the model used in the Itanium ABI, so <b>exceptions will not
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]413 interact correctly</b>. </li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]414
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]415</ul>
Chris Lattner46ecf612003-10-07 22:14:37 +0000[diff] [blame]416
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]417</div>
418
419<!-- ======================================================================= -->
420<div class="doc_subsection">
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]421 <a name="c-be">Known problems with the C back-end</a>
422</div>
423
424<div class="doc_text">
425
426<ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]427
428<li>The C back-end produces code that violates the ANSI C Type-Based Alias
429Analysis rules. As such, special options may be necessary to compile the code
430(for example, GCC requires the <tt>-fno-strict-aliasing</tt> option). This
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]431problem probably cannot be fixed.</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]432
Chris Lattnerc679fbb2003-11-04 20:06:53 +0000[diff] [blame]433<li><a href="http://llvm.cs.uiuc.edu/PR56">Zero arg vararg functions are not
Chris Lattnerb28c3282003-10-24 04:03:19 +0000[diff] [blame]434supported</a>. This should not affect LLVM produced by the C or C++
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]435frontends.</li>
Chris Lattnerb28c3282003-10-24 04:03:19 +0000[diff] [blame]436
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]437</ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]438
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]439</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]440
Andrew Lenharth2e18c622005-05-03 16:59:09 +0000[diff] [blame]441<!-- ======================================================================= -->
442<div class="doc_subsection">
Chris Lattner683a8472005-05-16 17:06:29 +0000[diff] [blame]443 <a name="x86-be">Known problems with the X86 back-end</a>
444</div>
445
446<div class="doc_text">
447
448<ul>
John Criswelle1a81202005-05-18 19:43:33 +0000[diff] [blame]449<li><a href="http://llvm.cs.uiuc.edu/PR566">Memory Mapped I/O Intrinsics do not fence memory</a></li>
Chris Lattner683a8472005-05-16 17:06:29 +0000[diff] [blame]450</ul>
451
452</div>
453
454<!-- ======================================================================= -->
455<div class="doc_subsection">
456 <a name="ppc-be">Known problems with the PowerPC back-end</a>
457</div>
458
459<div class="doc_text">
460
461<ul>
462<li>None yet</li>
463</ul>
464
465</div>
466
467<!-- ======================================================================= -->
468<div class="doc_subsection">
469 <a name="sparcv9-be">Known problems with the SparcV9 back-end</a>
470</div>
471
472<div class="doc_text">
473
474<ul>
475<li><a href="http://llvm.cs.uiuc.edu/PR60">[sparcv9] SparcV9 backend miscompiles
476several programs in the LLVM test suite</a></li>
477</ul>
478
479</div>
480
481<!-- ======================================================================= -->
482<div class="doc_subsection">
Andrew Lenharth2e18c622005-05-03 16:59:09 +0000[diff] [blame]483 <a name="alpha-be">Known problems with the Alpha back-end</a>
484</div>
485
486<div class="doc_text">
487
488<ul>
489
Chris Lattner683a8472005-05-16 17:06:29 +0000[diff] [blame]490<li>On 21164s, some rare FP arithmetic sequences which may trap do not have the
491appropriate nops inserted to ensure restartability.</li>
Andrew Lenharth2e18c622005-05-03 16:59:09 +0000[diff] [blame]492
Chris Lattner683a8472005-05-16 17:06:29 +0000[diff] [blame]493<li>Defining vararg functions is not supported (but calling them is ok).</li>
Andrew Lenharth2e18c622005-05-03 16:59:09 +0000[diff] [blame]494
Andrew Lenharth8ecaa452005-05-14 17:43:00 +0000[diff] [blame]495<li>Due to the vararg problems, C++ exceptions do not work. Small changes are required to the CFE (which break correctness in the exception handler) to compile the exception handling library (and thus the C++ standard library).</li>
496
Andrew Lenharth2e18c622005-05-03 16:59:09 +0000[diff] [blame]497</ul>
498
499</div>
500
Duraid Madina9a449002005-05-14 05:48:13 +0000[diff] [blame]501<!-- ======================================================================= -->
502<div class="doc_subsection">
503 <a name="ia64-be">Known problems with the IA64 back-end</a>
504</div>
505
506<div class="doc_text">
507
508<ul>
509
510<li>C++ programs are likely to fail on IA64, as calls to <tt>setjmp</tt> are
511made where the argument is not 16-byte aligned, as required on IA64. (Strictly
512speaking this is not a bug in the IA64 back-end; it will also be encountered
513when building C++ programs using the C back-end.)</li>
514
Chris Lattner683a8472005-05-16 17:06:29 +0000[diff] [blame]515<li>The C++ front-end does not use <a href="http://llvm.cs.uiuc.edu/PR406">IA64
516ABI compliant layout of v-tables</a>. In particular, it just stores function
517pointers instead of function descriptors in the vtable. This bug prevents
518mixing C++ code compiled with LLVM with C++ objects compiled by other C++
519compilers.</li>
Duraid Madina9a449002005-05-14 05:48:13 +0000[diff] [blame]520
Chris Lattner683a8472005-05-16 17:06:29 +0000[diff] [blame]521<li>There are a few ABI violations which will lead to problems when mixing LLVM
522output with code built with other compilers, particularly for floating-point
523programs.</li>
524
525<li>Defining vararg functions is not supported (but calling them is ok).</li>
Duraid Madina9a449002005-05-14 05:48:13 +0000[diff] [blame]526
527</ul>
528
529</div>
530
Chris Lattnerb62a5f02005-05-15 16:01:20 +0000[diff] [blame]531<!-- ======================================================================= -->
532<div class="doc_subsection">
533 <a name="sparcv8">Known problems with the SPARC-V8 back-end</a>
534</div>
535
536<div class="doc_text">
537
538<ul>
539<li>Many features are still missing (e.g. support for 64-bit integer
540arithmetic).</li>
541
542<li>This backend needs to be updated to use the SelectionDAG instruction
543selection framework.</li>
544</ul>
545
546</div>
547
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]548<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]549<div class="doc_section">
550 <a name="additionalinfo">Additional Information</a>
551</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]552<!-- *********************************************************************** -->
553
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]554<div class="doc_text">
555
Chris Lattnercb5596d2005-05-16 17:13:10 +0000[diff] [blame]556<p>A wide variety of additional information is available on the <a
557href="http://llvm.cs.uiuc.edu">LLVM web page</a>, including <a
558href="http://llvm.cs.uiuc.edu/docs/">documentation</a> and <a
559href="http://llvm.cs.uiuc.edu/pubs/">publications describing algorithms and
Misha Brukman96158092005-03-30 19:14:24 +0000[diff] [blame]560components implemented in LLVM</a>. The web page also contains versions of the
561API documentation which is up-to-date with the CVS version of the source code.
562You can access versions of these documents specific to this release by going
563into the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]564
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]565<p>If you have any questions or comments about LLVM, please feel free to contact
Chris Lattnercb5596d2005-05-16 17:13:10 +0000[diff] [blame]566us via the <a href="http://llvm.cs.uiuc.edu/docs/#maillist"> mailing
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]567lists</a>.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]568
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]569</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]570
571<!-- *********************************************************************** -->
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]572
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]573<hr>
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]574<address>
Misha Brukman8834af92003-12-21 22:53:21 +0000[diff] [blame]575 <a href="http://jigsaw.w3.org/css-validator/check/referer"><img
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