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gerrit-public.fairphone.software / fp2-dev / platform / external / llvm / bfd24683477ca7acd69aa868f6e5e52d3e25eaf2 / . / docs / ReleaseNotes.html
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4<head>
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Chris Lattner78bf32b2004-12-09 22:22:58 +0000[diff] [blame]7 <title>LLVM 1.5 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
Chris Lattner78bf32b2004-12-09 22:22:58 +0000[diff] [blame]11<div class="doc_title">LLVM 1.5 Release Notes</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]12
13<ol>
Misha Brukman500bc302003-11-22 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 Lattner4b538b92004-04-30 22:17:12 +0000[diff] [blame]16 <li><a href="GettingStarted.html">Installation Instructions</a></li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]17 <li><a href="#portability">Portability and Supported Platforms</a></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]18 <li><a href="#knownproblems">Known Problems</a>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]19 <li><a href="#additionalinfo">Additional Information</a></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]20</ol>
21
Chris Lattner7911ce22004-05-23 21:07:27 +0000[diff] [blame]22<div class="doc_author">
Chris Lattner78bf32b2004-12-09 22:22:58 +0000[diff] [blame]23 <p>Written by the <a href="http://llvm.cs.uiuc.edu">LLVM Team</a><p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]24</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]25
26<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]27<div class="doc_section">
28 <a name="intro">Introduction</a>
29</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]30<!-- *********************************************************************** -->
31
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]32<div class="doc_text">
33
34<p>This document contains the release notes for the LLVM compiler
Chris Lattner78bf32b2004-12-09 22:22:58 +0000[diff] [blame]35infrastructure, release 1.5. Here we describe the status of LLVM, including any
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame]36known problems and improvements from the previous release. The most up-to-date
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]37version of this document can be found on the <a
Chris Lattner78bf32b2004-12-09 22:22:58 +0000[diff] [blame]38href="http://llvm.cs.uiuc.edu/releases/1.5/">LLVM 1.5 web site</a>. If you are
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]39not reading this on the LLVM web pages, you should probably go there because
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]40this document may be updated after the release.</p>
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]41
Chris Lattner7506b1d2004-12-07 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 Lattner47ad72c2003-10-07 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 Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]46list</a> is a good place to send them.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]47
Chris Lattner78bf32b2004-12-09 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 Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]51href="http://llvm.cs.uiuc.edu/releases/">releases page</a>.</p>
52
53</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]54
55<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]56<div class="doc_section">
57 <a name="whatsnew">What's New?</a>
58</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]59<!-- *********************************************************************** -->
60
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]61<div class="doc_text">
62
Chris Lattner78bf32b2004-12-09 22:22:58 +0000[diff] [blame]63<p>This is the sixth public release of the LLVM compiler infrastructure.</p>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]64
Chris Lattner0bce6ac2004-12-10 16:27:34 +0000[diff] [blame]65<p> At this time, LLVM is known to correctly compile a broad range of C and
Chris Lattner78bf32b2004-12-09 22:22:58 +0000[diff] [blame]66C++ programs, including the SPEC CPU95 &amp; 2000 suite. TODO. It also includes
67bug fixes for those problems found since the 1.4 release.</p>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]68
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]69</div>
70
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]71<!--=========================================================================-->
72<div class="doc_subsubsection">
Chris Lattnera39719f2004-02-25 16:36:51 +0000[diff] [blame]73<a name="newfeatures">This release implements the following new features:</a>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]74</div>
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]75
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]76<div class="doc_text">
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]77<ol>
Chris Lattner74d74cd2004-12-11 06:10:52 +0000[diff] [blame]78 <li>LLVM now includes an <a href="http://llvm.cs.uiuc.edu/PR415">
79 Inter-Procedural Sparse Conditional Constant Propagation</a> pass, named
80 -ipsccp, which is run by default at link-time.</li>
Chris Lattner55ee0312003-11-19 22:05:38 +0000[diff] [blame]81</ol>
Chris Lattner0ef19062003-11-08 04:28:55 +0000[diff] [blame]82
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]83</div>
84
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]85
86<!--=========================================================================-->
87<div class="doc_subsubsection">
88In this release, the following missing features were implemented:
89</div>
Chris Lattner0ef19062003-11-08 04:28:55 +0000[diff] [blame]90
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]91<div class="doc_text">
92
Chris Lattner0ef19062003-11-08 04:28:55 +0000[diff] [blame]93<ol>
Chris Lattner78bf32b2004-12-09 22:22:58 +0000[diff] [blame]94 <li></li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]95</ol>
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]96
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]97</div>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]98
99<!--=========================================================================-->
100<div class="doc_subsubsection">
Misha Brukmana7aadf12004-04-19 02:56:49 +0000[diff] [blame]101<a name="qualityofimp">In this release, the following Quality of Implementation
102issues were fixed:</a>
Chris Lattnere29ac162003-12-20 03:42:11 +0000[diff] [blame]103</div>
104
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]105<div class="doc_text">
106
Chris Lattnere29ac162003-12-20 03:42:11 +0000[diff] [blame]107<ol>
Chris Lattner78bf32b2004-12-09 22:22:58 +0000[diff] [blame]108 <li></li>
Brian Gaeke6b31beb2004-01-16 21:55:04 +0000[diff] [blame]109</ol>
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]110</div>
Brian Gaeke6b31beb2004-01-16 21:55:04 +0000[diff] [blame]111
112<!--=========================================================================-->
113<div class="doc_subsubsection">
Chris Lattner6e1ef192004-05-02 04:19:15 +0000[diff] [blame]114<a name="codequality">This release includes the following Code Quality
115improvements:</a>
Chris Lattneraab56d42004-05-23 20:42:08 +0000[diff] [blame]116</div>
Chris Lattner89ca2b82003-10-27 17:06:39 +0000[diff] [blame]117
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]118<div class="doc_text">
Chris Lattner89ca2b82003-10-27 17:06:39 +0000[diff] [blame]119<ol>
Chris Lattner78bf32b2004-12-09 22:22:58 +0000[diff] [blame]120 <li></li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]121</ol>
Reid Spencer8e0262f2004-05-23 17:23:13 +0000[diff] [blame]122</div>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]123
124<!--=========================================================================-->
125<div class="doc_subsubsection">
Misha Brukmana7aadf12004-04-19 02:56:49 +0000[diff] [blame]126<a name="bugfix">In this release, the following bugs in the previous release
127were fixed:</a>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]128</div>
129
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]130<div class="doc_text">
131
Chris Lattnerd5713882004-08-02 20:28:44 +0000[diff] [blame]132<p>Bugs fixed in the LLVM Core:</p>
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]133
134<ol>
Chris Lattnere9367712004-12-29 04:03:23 +0000[diff] [blame]135 <li><a href="http://llvm.cs.uiuc.edu/PR490">[cbackend] Logical constant
136 expressions (and/or/xor) not implemented</a></li>
Chris Lattnerbfd24682004-12-29 04:39:50 +0000[diff] [blame^]137 <li><a href="http://llvm.cs.uiuc.edu/PR491">[dse] DSE deletes stores that
138 are partially overwritten by smaller stores</a></li>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]139</ol>
140
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]141<p>Bugs in the C/C++ front-end:</p>
142
143<ol>
Chris Lattner78bf32b2004-12-09 22:22:58 +0000[diff] [blame]144 <li></li>
Brian Gaekee77c8e72004-08-24 07:43:48 +0000[diff] [blame]145</ol>
146
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]147</div>
Reid Spencer8e0262f2004-05-23 17:23:13 +0000[diff] [blame]148
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]149<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]150<div class="doc_section">
151 <a name="portability">Portability and Supported Platforms</a>
152</div>
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]153<!-- *********************************************************************** -->
154
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]155<div class="doc_text">
156
John Criswell0b5b5e92004-12-08 20:35:47 +0000[diff] [blame]157<p>LLVM is known to work on the following platforms:</p>
Chris Lattner4654bdb2004-06-01 18:22:41 +0000[diff] [blame]158
159<ul>
160<li>Intel and AMD machines running Red Hat Linux and FreeBSD (and probably
161 other unix-like systems).</li>
162<li>Sun UltraSPARC workstations running Solaris 8.</li>
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame]163<li>Intel and AMD machines running on Win32 with the Cygwin libraries (limited
164 support is available for native builds with Visual C++).</li>
165<li>PowerPC-based Mac OS X systems, running 10.2 and above.</li>
Chris Lattner4654bdb2004-06-01 18:22:41 +0000[diff] [blame]166</ul>
167
Brian Gaekeb0fd7612004-05-09 05:28:35 +0000[diff] [blame]168<p>The core LLVM infrastructure uses
169<a href="http://www.gnu.org/software/autoconf/">GNU autoconf</a> to adapt itself
170to the machine and operating system on which it is built. However, minor
171porting may be required to get LLVM to work on new platforms. We welcome your
172portability patches and reports of successful builds or error messages.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]173
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]174</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]175
176<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]177<div class="doc_section">
178 <a name="knownproblems">Known Problems</a>
179</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]180<!-- *********************************************************************** -->
181
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]182<div class="doc_text">
183
184<p>This section contains all known problems with the LLVM system, listed by
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]185component. As new problems are discovered, they will be added to these
Chris Lattner5eccca42003-12-12 21:22:16 +0000[diff] [blame]186sections. If you run into a problem, please check the <a
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]187href="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]188there isn't already one.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]189
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]190</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]191
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]192<!-- ======================================================================= -->
193<div class="doc_subsection">
194 <a name="experimental">Experimental features included with this release</a>
195</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]196
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]197<div class="doc_text">
198
Misha Brukman6df9e2c2004-05-12 21:46:05 +0000[diff] [blame]199<p>The following components of this LLVM release are either untested, known to
200be broken or unreliable, or are in early development. These components should
201not be relied on, and bugs should not be filed against them, but they may be
202useful to some people. In particular, if you would like to work on one of these
203components, please contact us on the llvmdev list.</p>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]204
205<ul>
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame]206<li>The following passes are incomplete or buggy, and may be removed in future
207 releases: <tt>-pgmdep, -memdep, -ipmodref, -cee, -branch-combine,
208 -instloops, -paths, -pre</tt></li>
209<li>The <tt>llvm-db</tt> tool is in a very early stage of development, but can
210 be used to step through programs and inspect the stack.</li>
Chris Lattner0da7f492004-12-02 17:20:17 +0000[diff] [blame]211<li>The "iterative scan" register allocator (enabled with -regalloc=iterativescan)
212 is not stable.</li>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]213</ul>
214
215</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]216
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]217<!-- ======================================================================= -->
218<div class="doc_subsection">
219 <a name="core">Known problems with the LLVM Core</a>
220</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]221
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]222<div class="doc_text">
223
224<ul>
Reid Spencer4f86f9c2004-11-25 22:38:30 +0000[diff] [blame]225 <li>In the JIT, <tt>dlsym</tt> on a symbol compiled by the JIT will not work.
226 </li>
227 <li>The JIT does not use mutexes to protect its internal data structures. As
228 such, execution of a threaded program could cause these data structures to be
229 corrupted.
230 </li>
Reid Spencer4f86f9c2004-11-25 22:38:30 +0000[diff] [blame]231 <li><a href="http://llvm.cs.uiuc.edu/PR240">The lower-invoke pass does not
232 mark values live across a setjmp as volatile</a>. This missing feature
233 only affects targets whose setjmp/longjmp libraries do not save and restore
234 the entire register file.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]235</ul>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]236</div>
237
238<!-- ======================================================================= -->
239<div class="doc_subsection">
240 <a name="c-fe">Known problems with the C front-end</a>
241</div>
Chris Lattner47588f92003-10-02 05:07:23 +0000[diff] [blame]242
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]243<!-- _______________________________________________________________________ -->
Chris Lattnerb40efb32003-12-14 05:03:43 +0000[diff] [blame]244<div class="doc_subsubsection">Bugs</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]245
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]246<div class="doc_text">
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]247<ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]248<li>C99 Variable sized arrays do not release stack memory when they go out of
249 scope. Thus, the following program may run out of stack space:
250<pre>
251 for (i = 0; i != 1000000; ++i) {
252 int X[n];
253 foo(X);
254 }
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]255</pre></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]256
Misha Brukman6df9e2c2004-05-12 21:46:05 +0000[diff] [blame]257<li>Initialization of global union variables can only be done <a
Misha Brukman43ee2932004-12-04 00:45:09 +0000[diff] [blame]258href="http://llvm.cs.uiuc.edu/PR162">with the largest union member</a>.</li>
Chris Lattnerf580cdc2004-03-16 21:39:04 +0000[diff] [blame]259
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]260</ul>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]261</div>
262
263<!-- _______________________________________________________________________ -->
264<div class="doc_subsubsection">
265 Notes
266</div>
267
268<div class="doc_text">
269
270<ul>
271
272<li>Inline assembly is not yet supported.</li>
Chris Lattnere01fcfb2003-10-27 18:30:37 +0000[diff] [blame]273
274<li>"long double" is transformed by the front-end into "double". There is no
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]275support for floating point data types of any size other than 32 and 64
276bits.</li>
277
278<li>The following Unix system functionality has not been tested and may not
279work:
Misha Brukmane0c891c2003-11-22 01:00:11 +0000[diff] [blame]280 <ol>
281 <li><tt>sigsetjmp</tt>, <tt>siglongjmp</tt> - These are not turned into the
282 appropriate <tt>invoke</tt>/<tt>unwind</tt> instructions. Note that
283 <tt>setjmp</tt> and <tt>longjmp</tt> <em>are</em> compiled correctly.
284 <li><tt>getcontext</tt>, <tt>setcontext</tt>, <tt>makecontext</tt>
285 - These functions have not been tested.
286 </ol></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]287
288<li>Although many GCC extensions are supported, some are not. In particular,
289 the following extensions are known to <b>not be</b> supported:
290 <ol>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]291 <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]292 <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>
293 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Constructing-Calls.html#Constructing%20Calls">Constructing Calls</a>: Dispatching a call to another function.</li>
294 <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]295 <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]296 <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>
297 <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]298 <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>
299 <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 Lattner014e5f52004-12-08 18:25:34 +0000[diff] [blame]300 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Thread_002dLocal.html">Thread-Local</a>: Per-thread variables.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]301 <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]302 </ol>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]303
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]304 <p>The following GCC extensions are <b>partially</b> supported. An ignored
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]305 attribute means that the LLVM compiler ignores the presence of the attribute,
306 but the code should still work. An unsupported attribute is one which is
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]307 ignored by the LLVM compiler and will cause a different interpretation of
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]308 the program.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]309
310 <ol>
311 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Length.html#Variable%20Length">Variable Length</a>:
312 Arrays whose length is computed at run time.<br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]313 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]314
315 <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]316
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]317 Declaring that functions have no side effects or that they can never
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]318 return.<br>
319
320 <b>Supported:</b> <tt>format</tt>, <tt>format_arg</tt>, <tt>non_null</tt>,
John Criswell0b5b5e92004-12-08 20:35:47 +0000[diff] [blame]321 <tt>noreturn</tt>, <tt>constructor</tt>, <tt>destructor</tt>,
322 <tt>unused</tt>,
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]323 <tt>deprecated</tt>, <tt>warn_unused_result</tt>, <tt>weak</tt><br>
324
John Criswell0b5b5e92004-12-08 20:35:47 +0000[diff] [blame]325 <b>Ignored:</b> <tt>noinline</tt>,
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]326 <tt>always_inline</tt>, <tt>pure</tt>, <tt>const</tt>, <tt>nothrow</tt>,
327 <tt>malloc</tt>, <tt>no_instrument_function</tt>, <tt>cdecl</tt><br>
328
329 <b>Unsupported:</b> <tt>used</tt>, <tt>section</tt>, <tt>alias</tt>,
330 <tt>visibility</tt>, <tt>regparm</tt>, <tt>stdcall</tt>,
331 <tt>fastcall</tt>, all other target specific attributes</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]332
333 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Attributes.html#Variable%20Attributes">Variable Attributes</a>:
334 Specifying attributes of variables.<br>
335 <b>Supported:</b> <tt>cleanup</tt>, <tt>common</tt>, <tt>nocommon</tt>,
336 <tt>deprecated</tt>, <tt>transparent_union</tt>,
337 <tt>unused</tt>, <tt>weak</tt><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]338
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]339 <b>Unsupported:</b> <tt>aligned</tt>, <tt>mode</tt>, <tt>packed</tt>,
340 <tt>section</tt>, <tt>shared</tt>, <tt>tls_model</tt>,
341 <tt>vector_size</tt>, <tt>dllimport</tt>,
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]342 <tt>dllexport</tt>, all target specific attributes.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]343
Misha Brukmanc4b7bee2003-12-12 04:37:31 +0000[diff] [blame]344 <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]345 <b>Supported:</b> <tt>transparent_union</tt>, <tt>unused</tt>,
Misha Brukmanc4b7bee2003-12-12 04:37:31 +0000[diff] [blame]346 <tt>deprecated</tt>, <tt>may_alias</tt><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]347
348 <b>Unsupported:</b> <tt>aligned</tt>, <tt>packed</tt>,
349 all target specific attributes.</li>
350
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]351 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html#Other%20Builtins">Other Builtins</a>:
352 Other built-in functions.<br>
353 We support all builtins which have a C language equivalent (e.g.,
354 <tt>__builtin_cos</tt>), <tt>__builtin_alloca</tt>,
355 <tt>__builtin_types_compatible_p</tt>, <tt>__builtin_choose_expr</tt>,
Chris Lattnerceebeb62004-06-18 06:26:29 +0000[diff] [blame]356 <tt>__builtin_constant_p</tt>, and <tt>__builtin_expect</tt>
357 (currently ignored). We also support builtins for ISO C99 floating
358 point comparison macros (e.g., <tt>__builtin_islessequal</tt>).</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]359 </ol>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]360
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]361 <p>The following extensions <b>are</b> known to be supported:</p>
362
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]363 <ol>
Chris Lattner7fe97dd2004-03-16 08:54:07 +0000[diff] [blame]364 <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]365 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html#Statement%20Exprs">Statement Exprs</a>: Putting statements and declarations inside expressions.</li>
366 <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]367 <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]368 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Conditionals.html#Conditionals">Conditionals</a>: Omitting the middle operand of a <code>?:</code> expression.</li>
369 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Long-Long.html#Long%20Long">Long Long</a>: Double-word integers.</li>
370 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Complex.html#Complex">Complex</a>: Data types for complex numbers.</li>
371 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Hex-Floats.html#Hex%20Floats">Hex Floats</a>:Hexadecimal floating-point constants.</li>
372 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html#Zero%20Length">Zero Length</a>: Zero-length arrays.</li>
373 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Empty-Structures.html#Empty%20Structures">Empty Structures</a>: Structures with no members.</li>
374 <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>
375 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Escaped-Newlines.html#Escaped%20Newlines">Escaped Newlines</a>: Slightly looser rules for escaped newlines.</li>
376 <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]377 <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]378 <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]379 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Compound-Literals.html#Compound%20Literals">Compound Literals</a>: Compound literals give structures, unions,
380or arrays as values.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]381 <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]382 <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]383 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Case-Ranges.html#Case%20Ranges">Case Ranges</a>: `case 1 ... 9' and such.</li>
384 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Mixed-Declarations.html#Mixed%20Declarations">Mixed Declarations</a>: Mixing declarations and code.</li>
385 <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 Lattner78537e42004-12-08 18:29:38 +0000[diff] [blame]386 <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 Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]387 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Dollar-Signs.html#Dollar%20Signs">Dollar Signs</a>: Dollar sign is allowed in identifiers.</li>
388 <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>
389 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Alignment.html#Alignment">Alignment</a>: Inquiring about the alignment of a type or variable.</li>
390 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Inline.html#Inline">Inline</a>: Defining inline functions (as fast as macros).</li>
391 <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>
392 <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>
393 <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]394 <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]395 <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>
396 <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]397 </ol></li>
398
399</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]400
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]401<p>If you run into GCC extensions which have not been included in any of these
402lists, please let us know (also including whether or not they work).</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]403
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]404</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]405
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]406<!-- ======================================================================= -->
407<div class="doc_subsection">
408 <a name="c++-fe">Known problems with the C++ front-end</a>
409</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]410
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]411<div class="doc_text">
412
Reid Spencere09ca642004-12-07 08:39:08 +0000[diff] [blame]413<p>For this release, the C++ front-end is considered to be fully
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame]414tested and works for a number of non-trivial programs, including LLVM
415itself.</p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]416
417</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]418
419<!-- _______________________________________________________________________ -->
Chris Lattner3a51be12004-02-14 04:12:41 +0000[diff] [blame]420<div class="doc_subsubsection">Bugs</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]421
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]422<div class="doc_text">
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]423
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]424<ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]425<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]426 front-end</a>.</li>
Chris Lattner7962f712004-07-17 02:04:41 +0000[diff] [blame]427
Chris Lattnerd5713882004-08-02 20:28:44 +0000[diff] [blame]428<li><b>IA-64 specific</b>: The C++ front-end does not use <a
429href="http://llvm.cs.uiuc.edu/PR406">IA64 ABI compliant layout of v-tables</a>.
Chris Lattner7962f712004-07-17 02:04:41 +0000[diff] [blame]430In particular, it just stores function pointers instead of function
431descriptors in the vtable. This bug prevents mixing C++ code compiled with
Chris Lattner04db8082004-08-02 20:29:51 +0000[diff] [blame]432LLVM with C++ objects compiled by other C++ compilers.</li>
Chris Lattner7962f712004-07-17 02:04:41 +0000[diff] [blame]433
Chris Lattnerd5713882004-08-02 20:28:44 +0000[diff] [blame]434</ul>
435
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]436</div>
437
438<!-- _______________________________________________________________________ -->
439<div class="doc_subsubsection">
440 Notes
441</div>
442
443<div class="doc_text">
444
445<ul>
Chris Lattnere01fcfb2003-10-27 18:30:37 +0000[diff] [blame]446
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]447<li>The C++ front-end is based on a pre-release of the GCC 3.4 C++ parser. This
448parser is significantly more standards compliant (and picky) than prior GCC
449versions. For more information, see the C++ section of the <a
Chris Lattner9e848092003-12-12 04:25:33 +0000[diff] [blame]450href="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]451
452<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]453 performed. In particular, destructors for objects in the <tt>longjmp</tt>ing
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]454 function and in the <tt>setjmp</tt> receiver function may not be run.
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]455 Objects in intervening stack frames will be destroyed, however (which is
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]456 better than most compilers).</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]457
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]458<li>The LLVM C++ front-end follows the <a
459 href="http://www.codesourcery.com/cxx-abi">Itanium C++ ABI</a>.
460 This document, which is not Itanium specific, specifies a standard for name
461 mangling, class layout, v-table layout, RTTI formats, and other C++
462 representation issues. Because we use this API, code generated by the LLVM
463 compilers should be binary compatible with machine code generated by other
464 Itanium ABI C++ compilers (such as G++, the Intel and HP compilers, etc).
465 <i>However</i>, the exception handling mechanism used by LLVM is very
466 different from the model used in the Itanium ABI, so <b>exceptions will not
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]467 interact correctly</b>. </li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]468
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]469</ul>
Chris Lattnerfcc54b32003-10-07 22:14:37 +0000[diff] [blame]470
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]471</div>
472
473<!-- ======================================================================= -->
474<div class="doc_subsection">
475 <a name="x86-be">Known problems with the X86 back-end</a>
476</div>
477
478<div class="doc_text">
479
480<ul>
Chris Lattnerd5713882004-08-02 20:28:44 +0000[diff] [blame]481 <li>none yet</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]482</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]483
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]484</div>
485
486<!-- ======================================================================= -->
487<div class="doc_subsection">
Misha Brukmanadb1c392004-07-12 16:55:41 +0000[diff] [blame]488 <a name="sparcv9-be">Known problems with the SparcV9 back-end</a>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]489</div>
490
491<div class="doc_text">
492
493<ul>
Misha Brukmanadb1c392004-07-12 16:55:41 +0000[diff] [blame]494<li><a href="http://llvm.cs.uiuc.edu/PR60">[sparcv9] SparcV9 backend miscompiles
495several programs in the LLVM test suite</a></li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]496</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]497
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]498</div>
499
500<!-- ======================================================================= -->
501<div class="doc_subsection">
Chris Lattnerf32a5f52004-11-07 01:55:32 +0000[diff] [blame]502 <a name="ppc-be">Known problems with the PowerPC back-end</a>
503</div>
504
505<div class="doc_text">
506
507<ul>
508<li>none yet</li>
509</ul>
510
511</div>
512
513<!-- ======================================================================= -->
514<div class="doc_subsection">
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]515 <a name="c-be">Known problems with the C back-end</a>
516</div>
517
518<div class="doc_text">
519
520<ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]521
522<li>The C back-end produces code that violates the ANSI C Type-Based Alias
523Analysis rules. As such, special options may be necessary to compile the code
524(for example, GCC requires the <tt>-fno-strict-aliasing</tt> option). This
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]525problem probably cannot be fixed.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]526
Chris Lattner2855ecd2003-11-04 20:06:53 +0000[diff] [blame]527<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]528supported</a>. This should not affect LLVM produced by the C or C++
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]529frontends.</li>
Chris Lattner2af46052003-10-24 04:03:19 +0000[diff] [blame]530
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]531</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]532
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]533</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]534
535<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]536<div class="doc_section">
537 <a name="additionalinfo">Additional Information</a>
538</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]539<!-- *********************************************************************** -->
540
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]541<div class="doc_text">
542
543<p>A wide variety of additional information is available on the LLVM web page,
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]544including mailing lists and publications describing algorithms and components
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]545implemented in LLVM. The web page also contains versions of the API
546documentation which is up-to-date with the CVS version of the source code. You
547can access versions of these documents specific to this release by going into
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]548the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]549
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]550<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]551us via the <a href="http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev">mailing
552lists</a>.</p>
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