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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 Lattner980c50f2004-08-20 00:36:23 +0000[diff] [blame]118<li><a href="http://llvm.org/PR426">[llvmg++] Tons of warnings are spewed when
119 linking to libstdc++</a></li>
Chris Lattnere29ac162003-12-20 03:42:11 +0000[diff] [blame]120</ol>
121
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]122</div>
123
Chris Lattnere29ac162003-12-20 03:42:11 +0000[diff] [blame]124<!--=========================================================================-->
125<div class="doc_subsubsection">
Chris Lattnera39719f2004-02-25 16:36:51 +0000[diff] [blame]126In this release, the following build problems were fixed:
Brian Gaeke6b31beb2004-01-16 21:55:04 +0000[diff] [blame]127</div>
128
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]129<div class="doc_text">
Brian Gaeke6b31beb2004-01-16 21:55:04 +0000[diff] [blame]130<ol>
Chris Lattner5c3389a2004-08-16 00:20:18 +0000[diff] [blame]131<li></li>
Brian Gaeke6b31beb2004-01-16 21:55:04 +0000[diff] [blame]132</ol>
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]133</div>
Brian Gaeke6b31beb2004-01-16 21:55:04 +0000[diff] [blame]134
135<!--=========================================================================-->
136<div class="doc_subsubsection">
Chris Lattner6e1ef192004-05-02 04:19:15 +0000[diff] [blame]137<a name="codequality">This release includes the following Code Quality
138improvements:</a>
Chris Lattneraab56d42004-05-23 20:42:08 +0000[diff] [blame]139</div>
Chris Lattner89ca2b82003-10-27 17:06:39 +0000[diff] [blame]140
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]141<div class="doc_text">
Chris Lattner89ca2b82003-10-27 17:06:39 +0000[diff] [blame]142<ol>
Reid Spencerec98fed2004-09-07 17:52:38 +0000[diff] [blame]143 <li><a href="http://llvm.org/PR257">move test/Programs out of the main llvm
144 tree</a></li>
145 <li><a href="http://llvm.org/PR352">include/{Support,Config} ->
146 include/llvm/{Support,Config}</a></li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]147</ol>
Reid Spencer8e0262f2004-05-23 17:23:13 +0000[diff] [blame]148</div>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]149
150<!--=========================================================================-->
151<div class="doc_subsubsection">
Misha Brukmana7aadf12004-04-19 02:56:49 +0000[diff] [blame]152<a name="bugfix">In this release, the following bugs in the previous release
153were fixed:</a>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]154</div>
155
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]156<div class="doc_text">
157
Chris Lattnerd5713882004-08-02 20:28:44 +0000[diff] [blame]158<p>Bugs fixed in the LLVM Core:</p>
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]159
160<ol>
Reid Spencer51d1cb32004-08-16 16:48:19 +0000[diff] [blame]161<li><a href="http://llvm.org/PR422">[asmwriter] Asmwriter is really slow for
162 functions with lots of values</a></li>
Chris Lattner446562f2004-08-16 05:46:57 +0000[diff] [blame]163<li><a href="http://llvm.org/PR423">[anders-aa] Andersen's AA is completely
164 broken in LLVM 1.3</a></li>
Reid Spencerb810d5f2004-08-27 00:48:26 +0000[diff] [blame]165<li><a href="http://llvm.org/PR430">[bcwriter] Empty compaction tables
166 defined</a></li>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]167</ol>
168
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]169<p>Bugs in the C/C++ front-end:</p>
170
171<ol>
Chris Lattner5c3389a2004-08-16 00:20:18 +0000[diff] [blame]172<li></li>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]173</ol>
Brian Gaekee77c8e72004-08-24 07:43:48 +0000[diff] [blame]174
175<p>Bugs fixed in the Sparc V9 back-end:</p>
176
177<ol>
178<li><a href="http://llvm.org/PR428">[sparcv9] regalloc assertion
179 failure with certain indirect calls</a></li>
180</ol>
181
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]182</div>
Reid Spencer8e0262f2004-05-23 17:23:13 +0000[diff] [blame]183
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]184<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]185<div class="doc_section">
186 <a name="portability">Portability and Supported Platforms</a>
187</div>
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]188<!-- *********************************************************************** -->
189
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]190<div class="doc_text">
191
Chris Lattner4654bdb2004-06-01 18:22:41 +0000[diff] [blame]192<p>LLVM is known to work in the following platforms:</p>
193
194<ul>
195<li>Intel and AMD machines running Red Hat Linux and FreeBSD (and probably
196 other unix-like systems).</li>
197<li>Sun UltraSPARC workstations running Solaris 8.</li>
Chris Lattner4654bdb2004-06-01 18:22:41 +0000[diff] [blame]198<li>Intel and AMD machines running on Win32 with the Cygwin libraries.</li>
Chris Lattnere58d3562004-08-05 21:53:13 +0000[diff] [blame]199<li>PowerPC-based Mac OS X boxes, running 10.2 and above. Note that no JIT
200support is available yet, and LLC support is beta. The C backend can be used
201to produce stable code for this platform.</li>
Chris Lattner4654bdb2004-06-01 18:22:41 +0000[diff] [blame]202</ul>
203
Brian Gaekeb0fd7612004-05-09 05:28:35 +0000[diff] [blame]204<p>The core LLVM infrastructure uses
205<a href="http://www.gnu.org/software/autoconf/">GNU autoconf</a> to adapt itself
206to the machine and operating system on which it is built. However, minor
207porting may be required to get LLVM to work on new platforms. We welcome your
208portability patches and reports of successful builds or error messages.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]209
Chris Lattner4654bdb2004-06-01 18:22:41 +0000[diff] [blame]210<p>Note that the LLVM build system does not currently support directories with
211spaces on them when running on Win32/cygwin. We strongly recommend running
212LLVM and the C frontend out of a top-level directory without spaces (e.g.,
Chris Lattner74032a52004-06-01 19:41:30 +0000[diff] [blame]213<tt>/cygdrive/c/llvm</tt>). Also, make sure to install <b>all</b> of the
214cygwin packages. By default, many important tools are not installed that
Chris Lattner5aff3552004-08-16 20:20:46 +0000[diff] [blame]215are needed by the LLVM build process or test suite (e.g., /bin/time). Finally,
216please make sure that there are no directories with spaces in them in your
217PATH environment variable.</p>
Chris Lattner4654bdb2004-06-01 18:22:41 +0000[diff] [blame]218
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]219</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]220
221<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]222<div class="doc_section">
223 <a name="knownproblems">Known Problems</a>
224</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]225<!-- *********************************************************************** -->
226
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]227<div class="doc_text">
228
229<p>This section contains all known problems with the LLVM system, listed by
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]230component. As new problems are discovered, they will be added to these
Chris Lattner5eccca42003-12-12 21:22:16 +0000[diff] [blame]231sections. If you run into a problem, please check the <a
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]232href="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]233there isn't already one.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]234
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]235</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]236
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]237<!-- ======================================================================= -->
238<div class="doc_subsection">
239 <a name="experimental">Experimental features included with this release</a>
240</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]241
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]242<div class="doc_text">
243
Misha Brukman6df9e2c2004-05-12 21:46:05 +0000[diff] [blame]244<p>The following components of this LLVM release are either untested, known to
245be broken or unreliable, or are in early development. These components should
246not be relied on, and bugs should not be filed against them, but they may be
247useful to some people. In particular, if you would like to work on one of these
248components, please contact us on the llvmdev list.</p>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]249
250<ul>
Misha Brukman94118752004-08-05 21:04:03 +0000[diff] [blame]251<li>The PowerPC backend is incomplete and is known to miscompile several SPEC
252benchmarks. The file <tt>llvm/lib/Target/PowerPC/README.txt</tt> has
253details.</li>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]254<li>The following passes are incomplete or buggy: <tt>-pgmdep, -memdep,
Chris Lattner9934f972004-09-14 16:43:13 +0000[diff] [blame]255 -ipmodref, -cee, -branch-combine, -instloops, -paths</tt></li>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]256<li>The <tt>-pre</tt> pass is incomplete (there are cases it doesn't handle that
257 it should) and not thoroughly tested.</li>
258<li>The <tt>llvm-ar</tt> tool is incomplete and probably buggy.</li>
259<li>The <tt>llvm-db</tt> tool is in a very early stage of development.</li>
260</ul>
261
262</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]263
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]264<!-- ======================================================================= -->
265<div class="doc_subsection">
266 <a name="core">Known problems with the LLVM Core</a>
267</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]268
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]269<div class="doc_text">
270
271<ul>
272
273<li>In the JIT, <tt>dlsym</tt> on a symbol compiled by the JIT will not
274work.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]275
276<li>The JIT does not use mutexes to protect its internal data structures. As
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]277such, execution of a threaded program could cause these data structures to be
278corrupted.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]279
Chris Lattnereb673962004-08-08 03:33:07 +0000[diff] [blame]280<li>Linking in static archive files (.a files) is slow (there is no symbol
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]281table in the archive).</li>
Chris Lattner2855ecd2003-11-04 20:06:53 +0000[diff] [blame]282
Misha Brukmana7aadf12004-04-19 02:56:49 +0000[diff] [blame]283<li>The gccld program <a href="http://llvm.cs.uiuc.edu/PR139">does not link
284objects/archives in the order specified on the command line.</a></li>
Chris Lattner2e6fcaf2004-02-15 23:09:07 +0000[diff] [blame]285
286<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]287values live across a setjmp as volatile</a>. This missing feature only affects
Chris Lattner2e6fcaf2004-02-15 23:09:07 +0000[diff] [blame]288targets whose setjmp/longjmp libraries do not save and restore the entire
289register file.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]290</ul>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]291</div>
292
293<!-- ======================================================================= -->
294<div class="doc_subsection">
295 <a name="c-fe">Known problems with the C front-end</a>
296</div>
Chris Lattner47588f92003-10-02 05:07:23 +0000[diff] [blame]297
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]298<!-- _______________________________________________________________________ -->
Chris Lattnerb40efb32003-12-14 05:03:43 +0000[diff] [blame]299<div class="doc_subsubsection">Bugs</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]300
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]301<div class="doc_text">
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]302<ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]303<li>C99 Variable sized arrays do not release stack memory when they go out of
304 scope. Thus, the following program may run out of stack space:
305<pre>
306 for (i = 0; i != 1000000; ++i) {
307 int X[n];
308 foo(X);
309 }
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]310</pre></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]311
Misha Brukman6df9e2c2004-05-12 21:46:05 +0000[diff] [blame]312<li>Initialization of global union variables can only be done <a
313href="http://llvm.cs.uiuc.edu/bugs/show_bug.cgi?id=162">with the largest union
314member</a>.</li>
Chris Lattnerf580cdc2004-03-16 21:39:04 +0000[diff] [blame]315
Misha Brukmana7aadf12004-04-19 02:56:49 +0000[diff] [blame]316<li><a href="http://llvm.cs.uiuc.edu/PR244">[llvm-gcc] Error when an implicitly
317external function is re-declared as static</a></li>
Chris Lattnerf580cdc2004-03-16 21:39:04 +0000[diff] [blame]318
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]319</ul>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]320</div>
321
322<!-- _______________________________________________________________________ -->
323<div class="doc_subsubsection">
324 Notes
325</div>
326
327<div class="doc_text">
328
329<ul>
330
331<li>Inline assembly is not yet supported.</li>
Chris Lattnere01fcfb2003-10-27 18:30:37 +0000[diff] [blame]332
333<li>"long double" is transformed by the front-end into "double". There is no
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]334support for floating point data types of any size other than 32 and 64
335bits.</li>
336
337<li>The following Unix system functionality has not been tested and may not
338work:
Misha Brukmane0c891c2003-11-22 01:00:11 +0000[diff] [blame]339 <ol>
340 <li><tt>sigsetjmp</tt>, <tt>siglongjmp</tt> - These are not turned into the
341 appropriate <tt>invoke</tt>/<tt>unwind</tt> instructions. Note that
342 <tt>setjmp</tt> and <tt>longjmp</tt> <em>are</em> compiled correctly.
343 <li><tt>getcontext</tt>, <tt>setcontext</tt>, <tt>makecontext</tt>
344 - These functions have not been tested.
345 </ol></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]346
347<li>Although many GCC extensions are supported, some are not. In particular,
348 the following extensions are known to <b>not be</b> supported:
349 <ol>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]350 <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]351 <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>
352 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Constructing-Calls.html#Constructing%20Calls">Constructing Calls</a>: Dispatching a call to another function.</li>
353 <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]354 <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]355 <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>
356 <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]357 <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>
358 <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>
359 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Thread-Local.html#Thread-Local">Thread-Local</a>: Per-thread variables.</li>
360 <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]361 </ol>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]362
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]363 <p>The following GCC extensions are <b>partially</b> supported. An ignored
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]364 attribute means that the LLVM compiler ignores the presence of the attribute,
365 but the code should still work. An unsupported attribute is one which is
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]366 ignored by the LLVM compiler and will cause a different interpretation of
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]367 the program.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]368
369 <ol>
370 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Length.html#Variable%20Length">Variable Length</a>:
371 Arrays whose length is computed at run time.<br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]372 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]373
374 <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]375
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]376 Declaring that functions have no side effects or that they can never
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]377 return.<br>
378
379 <b>Supported:</b> <tt>format</tt>, <tt>format_arg</tt>, <tt>non_null</tt>,
380 <tt>constructor</tt>, <tt>destructor</tt>, <tt>unused</tt>,
381 <tt>deprecated</tt>, <tt>warn_unused_result</tt>, <tt>weak</tt><br>
382
383 <b>Ignored:</b> <tt>noreturn</tt>, <tt>noinline</tt>,
384 <tt>always_inline</tt>, <tt>pure</tt>, <tt>const</tt>, <tt>nothrow</tt>,
385 <tt>malloc</tt>, <tt>no_instrument_function</tt>, <tt>cdecl</tt><br>
386
387 <b>Unsupported:</b> <tt>used</tt>, <tt>section</tt>, <tt>alias</tt>,
388 <tt>visibility</tt>, <tt>regparm</tt>, <tt>stdcall</tt>,
389 <tt>fastcall</tt>, all other target specific attributes</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]390
391 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Attributes.html#Variable%20Attributes">Variable Attributes</a>:
392 Specifying attributes of variables.<br>
393 <b>Supported:</b> <tt>cleanup</tt>, <tt>common</tt>, <tt>nocommon</tt>,
394 <tt>deprecated</tt>, <tt>transparent_union</tt>,
395 <tt>unused</tt>, <tt>weak</tt><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]396
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]397 <b>Unsupported:</b> <tt>aligned</tt>, <tt>mode</tt>, <tt>packed</tt>,
398 <tt>section</tt>, <tt>shared</tt>, <tt>tls_model</tt>,
399 <tt>vector_size</tt>, <tt>dllimport</tt>,
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]400 <tt>dllexport</tt>, all target specific attributes.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]401
Misha Brukmanc4b7bee2003-12-12 04:37:31 +0000[diff] [blame]402 <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]403 <b>Supported:</b> <tt>transparent_union</tt>, <tt>unused</tt>,
Misha Brukmanc4b7bee2003-12-12 04:37:31 +0000[diff] [blame]404 <tt>deprecated</tt>, <tt>may_alias</tt><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]405
406 <b>Unsupported:</b> <tt>aligned</tt>, <tt>packed</tt>,
407 all target specific attributes.</li>
408
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]409 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html#Other%20Builtins">Other Builtins</a>:
410 Other built-in functions.<br>
411 We support all builtins which have a C language equivalent (e.g.,
412 <tt>__builtin_cos</tt>), <tt>__builtin_alloca</tt>,
413 <tt>__builtin_types_compatible_p</tt>, <tt>__builtin_choose_expr</tt>,
Chris Lattnerceebeb62004-06-18 06:26:29 +0000[diff] [blame]414 <tt>__builtin_constant_p</tt>, and <tt>__builtin_expect</tt>
415 (currently ignored). We also support builtins for ISO C99 floating
416 point comparison macros (e.g., <tt>__builtin_islessequal</tt>).</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]417 </ol>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]418
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]419 <p>The following extensions <b>are</b> known to be supported:</p>
420
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]421 <ol>
Chris Lattner7fe97dd2004-03-16 08:54:07 +0000[diff] [blame]422 <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]423 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html#Statement%20Exprs">Statement Exprs</a>: Putting statements and declarations inside expressions.</li>
424 <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]425 <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]426 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Conditionals.html#Conditionals">Conditionals</a>: Omitting the middle operand of a <code>?:</code> expression.</li>
427 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Long-Long.html#Long%20Long">Long Long</a>: Double-word integers.</li>
428 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Complex.html#Complex">Complex</a>: Data types for complex numbers.</li>
429 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Hex-Floats.html#Hex%20Floats">Hex Floats</a>:Hexadecimal floating-point constants.</li>
430 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html#Zero%20Length">Zero Length</a>: Zero-length arrays.</li>
431 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Empty-Structures.html#Empty%20Structures">Empty Structures</a>: Structures with no members.</li>
432 <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>
433 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Escaped-Newlines.html#Escaped%20Newlines">Escaped Newlines</a>: Slightly looser rules for escaped newlines.</li>
434 <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]435 <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]436 <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]437 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Compound-Literals.html#Compound%20Literals">Compound Literals</a>: Compound literals give structures, unions,
438or arrays as values.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]439 <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]440 <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]441 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Case-Ranges.html#Case%20Ranges">Case Ranges</a>: `case 1 ... 9' and such.</li>
442 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Mixed-Declarations.html#Mixed%20Declarations">Mixed Declarations</a>: Mixing declarations and code.</li>
443 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Function-Prototypes.html#Function%20Prototypes">Function Prototypes</a>: Prototype declarations and old-style definitions.</li>
444 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/C---Comments.html#C++%20Comments">C++ Comments</a>: C++ comments are recognized.</li>
445 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Dollar-Signs.html#Dollar%20Signs">Dollar Signs</a>: Dollar sign is allowed in identifiers.</li>
446 <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>
447 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Alignment.html#Alignment">Alignment</a>: Inquiring about the alignment of a type or variable.</li>
448 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Inline.html#Inline">Inline</a>: Defining inline functions (as fast as macros).</li>
449 <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>
450 <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>
451 <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]452 <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]453 <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>
454 <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]455 </ol></li>
456
457</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]458
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]459<p>If you run into GCC extensions which have not been included in any of these
460lists, please let us know (also including whether or not they work).</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]461
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]462</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]463
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]464<!-- ======================================================================= -->
465<div class="doc_subsection">
466 <a name="c++-fe">Known problems with the C++ front-end</a>
467</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]468
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]469<div class="doc_text">
470
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]471<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]472has not been tested as thoroughly as the C front-end. It has been tested and
473works for a number of non-trivial programs, but there may be lurking bugs.
474Please report any bugs or problems.</p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]475
476</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]477
478<!-- _______________________________________________________________________ -->
Chris Lattner3a51be12004-02-14 04:12:41 +0000[diff] [blame]479<div class="doc_subsubsection">Bugs</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]480
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]481<div class="doc_text">
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]482
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]483<ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]484<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]485 front-end</a>.</li>
Chris Lattner7962f712004-07-17 02:04:41 +0000[diff] [blame]486
Chris Lattnerd5713882004-08-02 20:28:44 +0000[diff] [blame]487<li><b>IA-64 specific</b>: The C++ front-end does not use <a
488href="http://llvm.cs.uiuc.edu/PR406">IA64 ABI compliant layout of v-tables</a>.
Chris Lattner7962f712004-07-17 02:04:41 +0000[diff] [blame]489In particular, it just stores function pointers instead of function
490descriptors in the vtable. This bug prevents mixing C++ code compiled with
Chris Lattner04db8082004-08-02 20:29:51 +0000[diff] [blame]491LLVM with C++ objects compiled by other C++ compilers.</li>
Chris Lattner7962f712004-07-17 02:04:41 +0000[diff] [blame]492
Chris Lattnerd5713882004-08-02 20:28:44 +0000[diff] [blame]493</ul>
494
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]495</div>
496
497<!-- _______________________________________________________________________ -->
498<div class="doc_subsubsection">
499 Notes
500</div>
501
502<div class="doc_text">
503
504<ul>
Chris Lattnere01fcfb2003-10-27 18:30:37 +0000[diff] [blame]505
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]506<li>The C++ front-end is based on a pre-release of the GCC 3.4 C++ parser. This
507parser is significantly more standards compliant (and picky) than prior GCC
508versions. For more information, see the C++ section of the <a
Chris Lattner9e848092003-12-12 04:25:33 +0000[diff] [blame]509href="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]510
511<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]512 performed. In particular, destructors for objects in the <tt>longjmp</tt>ing
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]513 function and in the <tt>setjmp</tt> receiver function may not be run.
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]514 Objects in intervening stack frames will be destroyed, however (which is
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]515 better than most compilers).</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]516
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]517<li>The LLVM C++ front-end follows the <a
518 href="http://www.codesourcery.com/cxx-abi">Itanium C++ ABI</a>.
519 This document, which is not Itanium specific, specifies a standard for name
520 mangling, class layout, v-table layout, RTTI formats, and other C++
521 representation issues. Because we use this API, code generated by the LLVM
522 compilers should be binary compatible with machine code generated by other
523 Itanium ABI C++ compilers (such as G++, the Intel and HP compilers, etc).
524 <i>However</i>, the exception handling mechanism used by LLVM is very
525 different from the model used in the Itanium ABI, so <b>exceptions will not
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]526 interact correctly</b>. </li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]527
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]528</ul>
Chris Lattnerfcc54b32003-10-07 22:14:37 +0000[diff] [blame]529
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]530</div>
531
532<!-- ======================================================================= -->
533<div class="doc_subsection">
534 <a name="x86-be">Known problems with the X86 back-end</a>
535</div>
536
537<div class="doc_text">
538
539<ul>
Chris Lattnerd5713882004-08-02 20:28:44 +0000[diff] [blame]540 <li>none yet</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]541</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]542
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]543</div>
544
545<!-- ======================================================================= -->
546<div class="doc_subsection">
Misha Brukmanadb1c392004-07-12 16:55:41 +0000[diff] [blame]547 <a name="sparcv9-be">Known problems with the SparcV9 back-end</a>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]548</div>
549
550<div class="doc_text">
551
552<ul>
Misha Brukmanadb1c392004-07-12 16:55:41 +0000[diff] [blame]553<li><a href="http://llvm.cs.uiuc.edu/PR60">[sparcv9] SparcV9 backend miscompiles
554several programs in the LLVM test suite</a></li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]555</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]556
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]557</div>
558
559<!-- ======================================================================= -->
560<div class="doc_subsection">
561 <a name="c-be">Known problems with the C back-end</a>
562</div>
563
564<div class="doc_text">
565
566<ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]567
568<li>The C back-end produces code that violates the ANSI C Type-Based Alias
569Analysis rules. As such, special options may be necessary to compile the code
570(for example, GCC requires the <tt>-fno-strict-aliasing</tt> option). This
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]571problem probably cannot be fixed.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]572
Chris Lattnere84843b2003-10-20 19:05:03 +0000[diff] [blame]573<li><a href="http://llvm.cs.uiuc.edu/PR33">Initializers for global variables</a>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]574cannot include special floating point numbers like Not-A-Number or
575Infinity.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]576
Chris Lattner2855ecd2003-11-04 20:06:53 +0000[diff] [blame]577<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]578supported</a>. This should not affect LLVM produced by the C or C++
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]579frontends.</li>
Chris Lattner2af46052003-10-24 04:03:19 +0000[diff] [blame]580
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]581</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]582
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]583</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]584
585<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]586<div class="doc_section">
587 <a name="additionalinfo">Additional Information</a>
588</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]589<!-- *********************************************************************** -->
590
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]591<div class="doc_text">
592
593<p>A wide variety of additional information is available on the LLVM web page,
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]594including mailing lists and publications describing algorithms and components
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]595implemented in LLVM. The web page also contains versions of the API
596documentation which is up-to-date with the CVS version of the source code. You
597can access versions of these documents specific to this release by going into
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]598the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]599
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]600<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]601us via the <a href="http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev">mailing
602lists</a>.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]603
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]604</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]605
606<!-- *********************************************************************** -->
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]607
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]608<hr>
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]609<address>
Misha Brukman38847d52003-12-21 22:53:21 +0000[diff] [blame]610 <a href="http://jigsaw.w3.org/css-validator/check/referer"><img
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612 <a href="http://validator.w3.org/check/referer"><img
613 src="http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01!" /></a>
614
Misha Brukmane0c891c2003-11-22 01:00:11 +0000[diff] [blame]615 <a href="http://llvm.cs.uiuc.edu">The LLVM Compiler Infrastructure</a><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]616 Last modified: $Date$
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]617</address>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]618
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]619</body>
620</html>