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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 Lattner57d43e12004-09-19 19:21:26 +0000[diff] [blame]89 <li><a href="http://llvm.org/PR257">move test/Programs out of the main llvm
90 tree</a></li>
Chris Lattner5c3389a2004-08-16 00:20:18 +0000[diff] [blame]91<li></li>
Chris Lattner55ee0312003-11-19 22:05:38 +0000[diff] [blame]92</ol>
Chris Lattner0ef19062003-11-08 04:28:55 +0000[diff] [blame]93
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]94</div>
95
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]96
97<!--=========================================================================-->
98<div class="doc_subsubsection">
99In this release, the following missing features were implemented:
100</div>
Chris Lattner0ef19062003-11-08 04:28:55 +0000[diff] [blame]101
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]102<div class="doc_text">
103
Chris Lattner0ef19062003-11-08 04:28:55 +0000[diff] [blame]104<ol>
Chris Lattner5c3389a2004-08-16 00:20:18 +0000[diff] [blame]105<li><a href="http://llvm.org/PR419">JIT interface should support arbitrary
106 calls</a></li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]107</ol>
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]108
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]109</div>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]110
111<!--=========================================================================-->
112<div class="doc_subsubsection">
Misha Brukmana7aadf12004-04-19 02:56:49 +0000[diff] [blame]113<a name="qualityofimp">In this release, the following Quality of Implementation
114issues were fixed:</a>
Chris Lattnere29ac162003-12-20 03:42:11 +0000[diff] [blame]115</div>
116
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]117<div class="doc_text">
118
Chris Lattnere29ac162003-12-20 03:42:11 +0000[diff] [blame]119<ol>
Chris Lattner980c50f2004-08-20 00:36:23 +0000[diff] [blame]120<li><a href="http://llvm.org/PR426">[llvmg++] Tons of warnings are spewed when
121 linking to libstdc++</a></li>
Chris Lattner57d43e12004-09-19 19:21:26 +0000[diff] [blame]122<li><a href="http://llvm.org/PR352">include/{Support,Config} ->
123 include/llvm/{Support,Config}</a></li>
Chris Lattnere29ac162003-12-20 03:42:11 +0000[diff] [blame]124</ol>
125
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]126</div>
127
Chris Lattnere29ac162003-12-20 03:42:11 +0000[diff] [blame]128<!--=========================================================================-->
129<div class="doc_subsubsection">
Chris Lattnera39719f2004-02-25 16:36:51 +0000[diff] [blame]130In this release, the following build problems were fixed:
Brian Gaeke6b31beb2004-01-16 21:55:04 +0000[diff] [blame]131</div>
132
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]133<div class="doc_text">
Brian Gaeke6b31beb2004-01-16 21:55:04 +0000[diff] [blame]134<ol>
Chris Lattner5c3389a2004-08-16 00:20:18 +0000[diff] [blame]135<li></li>
Brian Gaeke6b31beb2004-01-16 21:55:04 +0000[diff] [blame]136</ol>
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]137</div>
Brian Gaeke6b31beb2004-01-16 21:55:04 +0000[diff] [blame]138
139<!--=========================================================================-->
140<div class="doc_subsubsection">
Chris Lattner6e1ef192004-05-02 04:19:15 +0000[diff] [blame]141<a name="codequality">This release includes the following Code Quality
142improvements:</a>
Chris Lattneraab56d42004-05-23 20:42:08 +0000[diff] [blame]143</div>
Chris Lattner89ca2b82003-10-27 17:06:39 +0000[diff] [blame]144
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]145<div class="doc_text">
Chris Lattner89ca2b82003-10-27 17:06:39 +0000[diff] [blame]146<ol>
Chris Lattner57d43e12004-09-19 19:21:26 +0000[diff] [blame]147<li><a href="http://llvm.org/PR362">Ugly code generator for
148 std::min/std::max</a></li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]149</ol>
Reid Spencer8e0262f2004-05-23 17:23:13 +0000[diff] [blame]150</div>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]151
152<!--=========================================================================-->
153<div class="doc_subsubsection">
Misha Brukmana7aadf12004-04-19 02:56:49 +0000[diff] [blame]154<a name="bugfix">In this release, the following bugs in the previous release
155were fixed:</a>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]156</div>
157
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]158<div class="doc_text">
159
Chris Lattnerd5713882004-08-02 20:28:44 +0000[diff] [blame]160<p>Bugs fixed in the LLVM Core:</p>
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]161
162<ol>
Chris Lattner372dc8d2004-09-15 01:09:25 +0000[diff] [blame]163<li><a href="http://llvm.org/PR420">[licm] LICM invalidates alias analysis info
164 and uses broken information</a> (optimizer crash)</li>
Reid Spencer51d1cb32004-08-16 16:48:19 +0000[diff] [blame]165<li><a href="http://llvm.org/PR422">[asmwriter] Asmwriter is really slow for
Chris Lattner372dc8d2004-09-15 01:09:25 +0000[diff] [blame]166 functions with lots of values</a></li>
Chris Lattner446562f2004-08-16 05:46:57 +0000[diff] [blame]167<li><a href="http://llvm.org/PR423">[anders-aa] Andersen's AA is completely
168 broken in LLVM 1.3</a></li>
Reid Spencerb810d5f2004-08-27 00:48:26 +0000[diff] [blame]169<li><a href="http://llvm.org/PR430">[bcwriter] Empty compaction tables
170 defined</a></li>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]171</ol>
172
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]173<p>Bugs in the C/C++ front-end:</p>
174
175<ol>
Chris Lattner98e81bf2004-09-28 03:45:22 +0000[diff] [blame]176<li><a href="http://llvm.org/PR445">[llvmg++] not enough templates are instantiated</a></li>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]177</ol>
Brian Gaekee77c8e72004-08-24 07:43:48 +0000[diff] [blame]178
179<p>Bugs fixed in the Sparc V9 back-end:</p>
180
181<ol>
182<li><a href="http://llvm.org/PR428">[sparcv9] regalloc assertion
183 failure with certain indirect calls</a></li>
184</ol>
185
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]186</div>
Reid Spencer8e0262f2004-05-23 17:23:13 +0000[diff] [blame]187
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]188<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]189<div class="doc_section">
190 <a name="portability">Portability and Supported Platforms</a>
191</div>
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]192<!-- *********************************************************************** -->
193
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]194<div class="doc_text">
195
Chris Lattner4654bdb2004-06-01 18:22:41 +0000[diff] [blame]196<p>LLVM is known to work in the following platforms:</p>
197
198<ul>
199<li>Intel and AMD machines running Red Hat Linux and FreeBSD (and probably
200 other unix-like systems).</li>
201<li>Sun UltraSPARC workstations running Solaris 8.</li>
Chris Lattner4654bdb2004-06-01 18:22:41 +0000[diff] [blame]202<li>Intel and AMD machines running on Win32 with the Cygwin libraries.</li>
Chris Lattnere58d3562004-08-05 21:53:13 +0000[diff] [blame]203<li>PowerPC-based Mac OS X boxes, running 10.2 and above. Note that no JIT
204support is available yet, and LLC support is beta. The C backend can be used
205to produce stable code for this platform.</li>
Chris Lattner4654bdb2004-06-01 18:22:41 +0000[diff] [blame]206</ul>
207
Brian Gaekeb0fd7612004-05-09 05:28:35 +0000[diff] [blame]208<p>The core LLVM infrastructure uses
209<a href="http://www.gnu.org/software/autoconf/">GNU autoconf</a> to adapt itself
210to the machine and operating system on which it is built. However, minor
211porting may be required to get LLVM to work on new platforms. We welcome your
212portability patches and reports of successful builds or error messages.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]213
Chris Lattner4654bdb2004-06-01 18:22:41 +0000[diff] [blame]214<p>Note that the LLVM build system does not currently support directories with
215spaces on them when running on Win32/cygwin. We strongly recommend running
216LLVM and the C frontend out of a top-level directory without spaces (e.g.,
Chris Lattner74032a52004-06-01 19:41:30 +0000[diff] [blame]217<tt>/cygdrive/c/llvm</tt>). Also, make sure to install <b>all</b> of the
218cygwin packages. By default, many important tools are not installed that
Chris Lattner5aff3552004-08-16 20:20:46 +0000[diff] [blame]219are needed by the LLVM build process or test suite (e.g., /bin/time). Finally,
220please make sure that there are no directories with spaces in them in your
221PATH environment variable.</p>
Chris Lattner4654bdb2004-06-01 18:22:41 +0000[diff] [blame]222
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]223</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]224
225<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]226<div class="doc_section">
227 <a name="knownproblems">Known Problems</a>
228</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]229<!-- *********************************************************************** -->
230
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]231<div class="doc_text">
232
233<p>This section contains all known problems with the LLVM system, listed by
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]234component. As new problems are discovered, they will be added to these
Chris Lattner5eccca42003-12-12 21:22:16 +0000[diff] [blame]235sections. If you run into a problem, please check the <a
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]236href="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]237there isn't already one.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]238
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]239</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]240
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]241<!-- ======================================================================= -->
242<div class="doc_subsection">
243 <a name="experimental">Experimental features included with this release</a>
244</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]245
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]246<div class="doc_text">
247
Misha Brukman6df9e2c2004-05-12 21:46:05 +0000[diff] [blame]248<p>The following components of this LLVM release are either untested, known to
249be broken or unreliable, or are in early development. These components should
250not be relied on, and bugs should not be filed against them, but they may be
251useful to some people. In particular, if you would like to work on one of these
252components, please contact us on the llvmdev list.</p>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]253
254<ul>
Misha Brukman94118752004-08-05 21:04:03 +0000[diff] [blame]255<li>The PowerPC backend is incomplete and is known to miscompile several SPEC
256benchmarks. The file <tt>llvm/lib/Target/PowerPC/README.txt</tt> has
257details.</li>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]258<li>The following passes are incomplete or buggy: <tt>-pgmdep, -memdep,
Chris Lattner9934f972004-09-14 16:43:13 +0000[diff] [blame]259 -ipmodref, -cee, -branch-combine, -instloops, -paths</tt></li>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]260<li>The <tt>-pre</tt> pass is incomplete (there are cases it doesn't handle that
261 it should) and not thoroughly tested.</li>
262<li>The <tt>llvm-ar</tt> tool is incomplete and probably buggy.</li>
263<li>The <tt>llvm-db</tt> tool is in a very early stage of development.</li>
264</ul>
265
266</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]267
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]268<!-- ======================================================================= -->
269<div class="doc_subsection">
270 <a name="core">Known problems with the LLVM Core</a>
271</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]272
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]273<div class="doc_text">
274
275<ul>
276
277<li>In the JIT, <tt>dlsym</tt> on a symbol compiled by the JIT will not
278work.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]279
280<li>The JIT does not use mutexes to protect its internal data structures. As
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]281such, execution of a threaded program could cause these data structures to be
282corrupted.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]283
Chris Lattnereb673962004-08-08 03:33:07 +0000[diff] [blame]284<li>Linking in static archive files (.a files) is slow (there is no symbol
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]285table in the archive).</li>
Chris Lattner2855ecd2003-11-04 20:06:53 +0000[diff] [blame]286
Misha Brukmana7aadf12004-04-19 02:56:49 +0000[diff] [blame]287<li>The gccld program <a href="http://llvm.cs.uiuc.edu/PR139">does not link
288objects/archives in the order specified on the command line.</a></li>
Chris Lattner2e6fcaf2004-02-15 23:09:07 +0000[diff] [blame]289
290<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]291values live across a setjmp as volatile</a>. This missing feature only affects
Chris Lattner2e6fcaf2004-02-15 23:09:07 +0000[diff] [blame]292targets whose setjmp/longjmp libraries do not save and restore the entire
293register file.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]294</ul>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]295</div>
296
297<!-- ======================================================================= -->
298<div class="doc_subsection">
299 <a name="c-fe">Known problems with the C front-end</a>
300</div>
Chris Lattner47588f92003-10-02 05:07:23 +0000[diff] [blame]301
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]302<!-- _______________________________________________________________________ -->
Chris Lattnerb40efb32003-12-14 05:03:43 +0000[diff] [blame]303<div class="doc_subsubsection">Bugs</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]304
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]305<div class="doc_text">
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]306<ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]307<li>C99 Variable sized arrays do not release stack memory when they go out of
308 scope. Thus, the following program may run out of stack space:
309<pre>
310 for (i = 0; i != 1000000; ++i) {
311 int X[n];
312 foo(X);
313 }
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]314</pre></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]315
Misha Brukman6df9e2c2004-05-12 21:46:05 +0000[diff] [blame]316<li>Initialization of global union variables can only be done <a
317href="http://llvm.cs.uiuc.edu/bugs/show_bug.cgi?id=162">with the largest union
318member</a>.</li>
Chris Lattnerf580cdc2004-03-16 21:39:04 +0000[diff] [blame]319
Misha Brukmana7aadf12004-04-19 02:56:49 +0000[diff] [blame]320<li><a href="http://llvm.cs.uiuc.edu/PR244">[llvm-gcc] Error when an implicitly
321external function is re-declared as static</a></li>
Chris Lattnerf580cdc2004-03-16 21:39:04 +0000[diff] [blame]322
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]323</ul>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]324</div>
325
326<!-- _______________________________________________________________________ -->
327<div class="doc_subsubsection">
328 Notes
329</div>
330
331<div class="doc_text">
332
333<ul>
334
335<li>Inline assembly is not yet supported.</li>
Chris Lattnere01fcfb2003-10-27 18:30:37 +0000[diff] [blame]336
337<li>"long double" is transformed by the front-end into "double". There is no
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]338support for floating point data types of any size other than 32 and 64
339bits.</li>
340
341<li>The following Unix system functionality has not been tested and may not
342work:
Misha Brukmane0c891c2003-11-22 01:00:11 +0000[diff] [blame]343 <ol>
344 <li><tt>sigsetjmp</tt>, <tt>siglongjmp</tt> - These are not turned into the
345 appropriate <tt>invoke</tt>/<tt>unwind</tt> instructions. Note that
346 <tt>setjmp</tt> and <tt>longjmp</tt> <em>are</em> compiled correctly.
347 <li><tt>getcontext</tt>, <tt>setcontext</tt>, <tt>makecontext</tt>
348 - These functions have not been tested.
349 </ol></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]350
351<li>Although many GCC extensions are supported, some are not. In particular,
352 the following extensions are known to <b>not be</b> supported:
353 <ol>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]354 <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]355 <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>
356 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Constructing-Calls.html#Constructing%20Calls">Constructing Calls</a>: Dispatching a call to another function.</li>
357 <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]358 <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]359 <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>
360 <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]361 <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>
362 <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>
363 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Thread-Local.html#Thread-Local">Thread-Local</a>: Per-thread variables.</li>
364 <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]365 </ol>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]366
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]367 <p>The following GCC extensions are <b>partially</b> supported. An ignored
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]368 attribute means that the LLVM compiler ignores the presence of the attribute,
369 but the code should still work. An unsupported attribute is one which is
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]370 ignored by the LLVM compiler and will cause a different interpretation of
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]371 the program.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]372
373 <ol>
374 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Length.html#Variable%20Length">Variable Length</a>:
375 Arrays whose length is computed at run time.<br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]376 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]377
378 <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]379
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]380 Declaring that functions have no side effects or that they can never
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]381 return.<br>
382
383 <b>Supported:</b> <tt>format</tt>, <tt>format_arg</tt>, <tt>non_null</tt>,
384 <tt>constructor</tt>, <tt>destructor</tt>, <tt>unused</tt>,
385 <tt>deprecated</tt>, <tt>warn_unused_result</tt>, <tt>weak</tt><br>
386
387 <b>Ignored:</b> <tt>noreturn</tt>, <tt>noinline</tt>,
388 <tt>always_inline</tt>, <tt>pure</tt>, <tt>const</tt>, <tt>nothrow</tt>,
389 <tt>malloc</tt>, <tt>no_instrument_function</tt>, <tt>cdecl</tt><br>
390
391 <b>Unsupported:</b> <tt>used</tt>, <tt>section</tt>, <tt>alias</tt>,
392 <tt>visibility</tt>, <tt>regparm</tt>, <tt>stdcall</tt>,
393 <tt>fastcall</tt>, all other target specific attributes</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]394
395 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Attributes.html#Variable%20Attributes">Variable Attributes</a>:
396 Specifying attributes of variables.<br>
397 <b>Supported:</b> <tt>cleanup</tt>, <tt>common</tt>, <tt>nocommon</tt>,
398 <tt>deprecated</tt>, <tt>transparent_union</tt>,
399 <tt>unused</tt>, <tt>weak</tt><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]400
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]401 <b>Unsupported:</b> <tt>aligned</tt>, <tt>mode</tt>, <tt>packed</tt>,
402 <tt>section</tt>, <tt>shared</tt>, <tt>tls_model</tt>,
403 <tt>vector_size</tt>, <tt>dllimport</tt>,
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]404 <tt>dllexport</tt>, all target specific attributes.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]405
Misha Brukmanc4b7bee2003-12-12 04:37:31 +0000[diff] [blame]406 <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]407 <b>Supported:</b> <tt>transparent_union</tt>, <tt>unused</tt>,
Misha Brukmanc4b7bee2003-12-12 04:37:31 +0000[diff] [blame]408 <tt>deprecated</tt>, <tt>may_alias</tt><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]409
410 <b>Unsupported:</b> <tt>aligned</tt>, <tt>packed</tt>,
411 all target specific attributes.</li>
412
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]413 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html#Other%20Builtins">Other Builtins</a>:
414 Other built-in functions.<br>
415 We support all builtins which have a C language equivalent (e.g.,
416 <tt>__builtin_cos</tt>), <tt>__builtin_alloca</tt>,
417 <tt>__builtin_types_compatible_p</tt>, <tt>__builtin_choose_expr</tt>,
Chris Lattnerceebeb62004-06-18 06:26:29 +0000[diff] [blame]418 <tt>__builtin_constant_p</tt>, and <tt>__builtin_expect</tt>
419 (currently ignored). We also support builtins for ISO C99 floating
420 point comparison macros (e.g., <tt>__builtin_islessequal</tt>).</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]421 </ol>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]422
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]423 <p>The following extensions <b>are</b> known to be supported:</p>
424
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]425 <ol>
Chris Lattner7fe97dd2004-03-16 08:54:07 +0000[diff] [blame]426 <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]427 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html#Statement%20Exprs">Statement Exprs</a>: Putting statements and declarations inside expressions.</li>
428 <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]429 <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]430 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Conditionals.html#Conditionals">Conditionals</a>: Omitting the middle operand of a <code>?:</code> expression.</li>
431 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Long-Long.html#Long%20Long">Long Long</a>: Double-word integers.</li>
432 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Complex.html#Complex">Complex</a>: Data types for complex numbers.</li>
433 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Hex-Floats.html#Hex%20Floats">Hex Floats</a>:Hexadecimal floating-point constants.</li>
434 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html#Zero%20Length">Zero Length</a>: Zero-length arrays.</li>
435 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Empty-Structures.html#Empty%20Structures">Empty Structures</a>: Structures with no members.</li>
436 <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>
437 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Escaped-Newlines.html#Escaped%20Newlines">Escaped Newlines</a>: Slightly looser rules for escaped newlines.</li>
438 <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]439 <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]440 <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]441 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Compound-Literals.html#Compound%20Literals">Compound Literals</a>: Compound literals give structures, unions,
442or arrays as values.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]443 <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]444 <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]445 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Case-Ranges.html#Case%20Ranges">Case Ranges</a>: `case 1 ... 9' and such.</li>
446 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Mixed-Declarations.html#Mixed%20Declarations">Mixed Declarations</a>: Mixing declarations and code.</li>
447 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Function-Prototypes.html#Function%20Prototypes">Function Prototypes</a>: Prototype declarations and old-style definitions.</li>
448 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/C---Comments.html#C++%20Comments">C++ Comments</a>: C++ comments are recognized.</li>
449 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Dollar-Signs.html#Dollar%20Signs">Dollar Signs</a>: Dollar sign is allowed in identifiers.</li>
450 <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>
451 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Alignment.html#Alignment">Alignment</a>: Inquiring about the alignment of a type or variable.</li>
452 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Inline.html#Inline">Inline</a>: Defining inline functions (as fast as macros).</li>
453 <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>
454 <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>
455 <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]456 <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]457 <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>
458 <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]459 </ol></li>
460
461</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]462
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]463<p>If you run into GCC extensions which have not been included in any of these
464lists, please let us know (also including whether or not they work).</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]465
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]466</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]467
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]468<!-- ======================================================================= -->
469<div class="doc_subsection">
470 <a name="c++-fe">Known problems with the C++ front-end</a>
471</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]472
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]473<div class="doc_text">
474
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]475<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]476has not been tested as thoroughly as the C front-end. It has been tested and
477works for a number of non-trivial programs, but there may be lurking bugs.
478Please report any bugs or problems.</p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]479
480</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]481
482<!-- _______________________________________________________________________ -->
Chris Lattner3a51be12004-02-14 04:12:41 +0000[diff] [blame]483<div class="doc_subsubsection">Bugs</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]484
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]485<div class="doc_text">
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]486
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]487<ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]488<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]489 front-end</a>.</li>
Chris Lattner7962f712004-07-17 02:04:41 +0000[diff] [blame]490
Chris Lattnerd5713882004-08-02 20:28:44 +0000[diff] [blame]491<li><b>IA-64 specific</b>: The C++ front-end does not use <a
492href="http://llvm.cs.uiuc.edu/PR406">IA64 ABI compliant layout of v-tables</a>.
Chris Lattner7962f712004-07-17 02:04:41 +0000[diff] [blame]493In particular, it just stores function pointers instead of function
494descriptors in the vtable. This bug prevents mixing C++ code compiled with
Chris Lattner04db8082004-08-02 20:29:51 +0000[diff] [blame]495LLVM with C++ objects compiled by other C++ compilers.</li>
Chris Lattner7962f712004-07-17 02:04:41 +0000[diff] [blame]496
Chris Lattnerd5713882004-08-02 20:28:44 +0000[diff] [blame]497</ul>
498
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]499</div>
500
501<!-- _______________________________________________________________________ -->
502<div class="doc_subsubsection">
503 Notes
504</div>
505
506<div class="doc_text">
507
508<ul>
Chris Lattnere01fcfb2003-10-27 18:30:37 +0000[diff] [blame]509
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]510<li>The C++ front-end is based on a pre-release of the GCC 3.4 C++ parser. This
511parser is significantly more standards compliant (and picky) than prior GCC
512versions. For more information, see the C++ section of the <a
Chris Lattner9e848092003-12-12 04:25:33 +0000[diff] [blame]513href="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]514
515<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]516 performed. In particular, destructors for objects in the <tt>longjmp</tt>ing
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]517 function and in the <tt>setjmp</tt> receiver function may not be run.
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]518 Objects in intervening stack frames will be destroyed, however (which is
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]519 better than most compilers).</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]520
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]521<li>The LLVM C++ front-end follows the <a
522 href="http://www.codesourcery.com/cxx-abi">Itanium C++ ABI</a>.
523 This document, which is not Itanium specific, specifies a standard for name
524 mangling, class layout, v-table layout, RTTI formats, and other C++
525 representation issues. Because we use this API, code generated by the LLVM
526 compilers should be binary compatible with machine code generated by other
527 Itanium ABI C++ compilers (such as G++, the Intel and HP compilers, etc).
528 <i>However</i>, the exception handling mechanism used by LLVM is very
529 different from the model used in the Itanium ABI, so <b>exceptions will not
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]530 interact correctly</b>. </li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]531
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]532</ul>
Chris Lattnerfcc54b32003-10-07 22:14:37 +0000[diff] [blame]533
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]534</div>
535
536<!-- ======================================================================= -->
537<div class="doc_subsection">
538 <a name="x86-be">Known problems with the X86 back-end</a>
539</div>
540
541<div class="doc_text">
542
543<ul>
Chris Lattnerd5713882004-08-02 20:28:44 +0000[diff] [blame]544 <li>none yet</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]545</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]546
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]547</div>
548
549<!-- ======================================================================= -->
550<div class="doc_subsection">
Misha Brukmanadb1c392004-07-12 16:55:41 +0000[diff] [blame]551 <a name="sparcv9-be">Known problems with the SparcV9 back-end</a>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]552</div>
553
554<div class="doc_text">
555
556<ul>
Misha Brukmanadb1c392004-07-12 16:55:41 +0000[diff] [blame]557<li><a href="http://llvm.cs.uiuc.edu/PR60">[sparcv9] SparcV9 backend miscompiles
558several programs in the LLVM test suite</a></li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]559</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]560
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]561</div>
562
563<!-- ======================================================================= -->
564<div class="doc_subsection">
565 <a name="c-be">Known problems with the C back-end</a>
566</div>
567
568<div class="doc_text">
569
570<ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]571
572<li>The C back-end produces code that violates the ANSI C Type-Based Alias
573Analysis rules. As such, special options may be necessary to compile the code
574(for example, GCC requires the <tt>-fno-strict-aliasing</tt> option). This
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]575problem probably cannot be fixed.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]576
Chris Lattnere84843b2003-10-20 19:05:03 +0000[diff] [blame]577<li><a href="http://llvm.cs.uiuc.edu/PR33">Initializers for global variables</a>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]578cannot include special floating point numbers like Not-A-Number or
579Infinity.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]580
Chris Lattner2855ecd2003-11-04 20:06:53 +0000[diff] [blame]581<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]582supported</a>. This should not affect LLVM produced by the C or C++
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]583frontends.</li>
Chris Lattner2af46052003-10-24 04:03:19 +0000[diff] [blame]584
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]585</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]586
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]587</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]588
589<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]590<div class="doc_section">
591 <a name="additionalinfo">Additional Information</a>
592</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]593<!-- *********************************************************************** -->
594
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]595<div class="doc_text">
596
597<p>A wide variety of additional information is available on the LLVM web page,
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]598including mailing lists and publications describing algorithms and components
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]599implemented in LLVM. The web page also contains versions of the API
600documentation which is up-to-date with the CVS version of the source code. You
601can access versions of these documents specific to this release by going into
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]602the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]603
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]604<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]605us via the <a href="http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev">mailing
606lists</a>.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]607
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]608</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]609
610<!-- *********************************************************************** -->
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]611
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]612<hr>
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]613<address>
Misha Brukman38847d52003-12-21 22:53:21 +0000[diff] [blame]614 <a href="http://jigsaw.w3.org/css-validator/check/referer"><img
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618
Misha Brukmane0c891c2003-11-22 01:00:11 +0000[diff] [blame]619 <a href="http://llvm.cs.uiuc.edu">The LLVM Compiler Infrastructure</a><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]620 Last modified: $Date$
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]621</address>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]622
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]623</body>
624</html>