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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>
Chris Lattner5c3389a2004-08-16 00:20:18 +0000[diff] [blame]143<li></li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]144</ol>
Reid Spencer8e0262f2004-05-23 17:23:13 +0000[diff] [blame]145</div>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]146
147<!--=========================================================================-->
148<div class="doc_subsubsection">
Misha Brukmana7aadf12004-04-19 02:56:49 +0000[diff] [blame]149<a name="bugfix">In this release, the following bugs in the previous release
150were fixed:</a>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]151</div>
152
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]153<div class="doc_text">
154
Chris Lattnerd5713882004-08-02 20:28:44 +0000[diff] [blame]155<p>Bugs fixed in the LLVM Core:</p>
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]156
157<ol>
Reid Spencer51d1cb32004-08-16 16:48:19 +0000[diff] [blame]158<li><a href="http://llvm.org/PR422">[asmwriter] Asmwriter is really slow for
159 functions with lots of values</a></li>
Chris Lattner446562f2004-08-16 05:46:57 +0000[diff] [blame]160<li><a href="http://llvm.org/PR423">[anders-aa] Andersen's AA is completely
161 broken in LLVM 1.3</a></li>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]162</ol>
163
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]164<p>Bugs in the C/C++ front-end:</p>
165
166<ol>
Chris Lattner5c3389a2004-08-16 00:20:18 +0000[diff] [blame]167<li></li>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]168</ol>
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]169</div>
Reid Spencer8e0262f2004-05-23 17:23:13 +0000[diff] [blame]170
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]171<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]172<div class="doc_section">
173 <a name="portability">Portability and Supported Platforms</a>
174</div>
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]175<!-- *********************************************************************** -->
176
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]177<div class="doc_text">
178
Chris Lattner4654bdb2004-06-01 18:22:41 +0000[diff] [blame]179<p>LLVM is known to work in the following platforms:</p>
180
181<ul>
182<li>Intel and AMD machines running Red Hat Linux and FreeBSD (and probably
183 other unix-like systems).</li>
184<li>Sun UltraSPARC workstations running Solaris 8.</li>
Chris Lattner4654bdb2004-06-01 18:22:41 +0000[diff] [blame]185<li>Intel and AMD machines running on Win32 with the Cygwin libraries.</li>
Chris Lattnere58d3562004-08-05 21:53:13 +0000[diff] [blame]186<li>PowerPC-based Mac OS X boxes, running 10.2 and above. Note that no JIT
187support is available yet, and LLC support is beta. The C backend can be used
188to produce stable code for this platform.</li>
Chris Lattner4654bdb2004-06-01 18:22:41 +0000[diff] [blame]189</ul>
190
Brian Gaekeb0fd7612004-05-09 05:28:35 +0000[diff] [blame]191<p>The core LLVM infrastructure uses
192<a href="http://www.gnu.org/software/autoconf/">GNU autoconf</a> to adapt itself
193to the machine and operating system on which it is built. However, minor
194porting may be required to get LLVM to work on new platforms. We welcome your
195portability patches and reports of successful builds or error messages.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]196
Chris Lattner4654bdb2004-06-01 18:22:41 +0000[diff] [blame]197<p>Note that the LLVM build system does not currently support directories with
198spaces on them when running on Win32/cygwin. We strongly recommend running
199LLVM and the C frontend out of a top-level directory without spaces (e.g.,
Chris Lattner74032a52004-06-01 19:41:30 +0000[diff] [blame]200<tt>/cygdrive/c/llvm</tt>). Also, make sure to install <b>all</b> of the
201cygwin packages. By default, many important tools are not installed that
Chris Lattner5aff3552004-08-16 20:20:46 +0000[diff] [blame]202are needed by the LLVM build process or test suite (e.g., /bin/time). Finally,
203please make sure that there are no directories with spaces in them in your
204PATH environment variable.</p>
Chris Lattner4654bdb2004-06-01 18:22:41 +0000[diff] [blame]205
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]206</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]207
208<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]209<div class="doc_section">
210 <a name="knownproblems">Known Problems</a>
211</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]212<!-- *********************************************************************** -->
213
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]214<div class="doc_text">
215
216<p>This section contains all known problems with the LLVM system, listed by
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]217component. As new problems are discovered, they will be added to these
Chris Lattner5eccca42003-12-12 21:22:16 +0000[diff] [blame]218sections. If you run into a problem, please check the <a
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]219href="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]220there isn't already one.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]221
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]222</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]223
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]224<!-- ======================================================================= -->
225<div class="doc_subsection">
226 <a name="experimental">Experimental features included with this release</a>
227</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]228
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]229<div class="doc_text">
230
Misha Brukman6df9e2c2004-05-12 21:46:05 +0000[diff] [blame]231<p>The following components of this LLVM release are either untested, known to
232be broken or unreliable, or are in early development. These components should
233not be relied on, and bugs should not be filed against them, but they may be
234useful to some people. In particular, if you would like to work on one of these
235components, please contact us on the llvmdev list.</p>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]236
237<ul>
Misha Brukman94118752004-08-05 21:04:03 +0000[diff] [blame]238<li>The PowerPC backend is incomplete and is known to miscompile several SPEC
239benchmarks. The file <tt>llvm/lib/Target/PowerPC/README.txt</tt> has
240details.</li>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]241<li>The following passes are incomplete or buggy: <tt>-pgmdep, -memdep,
Chris Lattnercbabe702004-06-28 00:44:45 +0000[diff] [blame]242 -ipmodref, -cee</tt></li>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]243<li>The <tt>-pre</tt> pass is incomplete (there are cases it doesn't handle that
244 it should) and not thoroughly tested.</li>
245<li>The <tt>llvm-ar</tt> tool is incomplete and probably buggy.</li>
246<li>The <tt>llvm-db</tt> tool is in a very early stage of development.</li>
247</ul>
248
249</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]250
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]251<!-- ======================================================================= -->
252<div class="doc_subsection">
253 <a name="core">Known problems with the LLVM Core</a>
254</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]255
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]256<div class="doc_text">
257
258<ul>
259
260<li>In the JIT, <tt>dlsym</tt> on a symbol compiled by the JIT will not
261work.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]262
263<li>The JIT does not use mutexes to protect its internal data structures. As
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]264such, execution of a threaded program could cause these data structures to be
265corrupted.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]266
Chris Lattnereb673962004-08-08 03:33:07 +0000[diff] [blame]267<li>Linking in static archive files (.a files) is slow (there is no symbol
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]268table in the archive).</li>
Chris Lattner2855ecd2003-11-04 20:06:53 +0000[diff] [blame]269
Misha Brukmana7aadf12004-04-19 02:56:49 +0000[diff] [blame]270<li>The gccld program <a href="http://llvm.cs.uiuc.edu/PR139">does not link
271objects/archives in the order specified on the command line.</a></li>
Chris Lattner2e6fcaf2004-02-15 23:09:07 +0000[diff] [blame]272
273<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]274values live across a setjmp as volatile</a>. This missing feature only affects
Chris Lattner2e6fcaf2004-02-15 23:09:07 +0000[diff] [blame]275targets whose setjmp/longjmp libraries do not save and restore the entire
276register file.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]277</ul>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]278</div>
279
280<!-- ======================================================================= -->
281<div class="doc_subsection">
282 <a name="c-fe">Known problems with the C front-end</a>
283</div>
Chris Lattner47588f92003-10-02 05:07:23 +0000[diff] [blame]284
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]285<!-- _______________________________________________________________________ -->
Chris Lattnerb40efb32003-12-14 05:03:43 +0000[diff] [blame]286<div class="doc_subsubsection">Bugs</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]287
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]288<div class="doc_text">
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]289<ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]290<li>C99 Variable sized arrays do not release stack memory when they go out of
291 scope. Thus, the following program may run out of stack space:
292<pre>
293 for (i = 0; i != 1000000; ++i) {
294 int X[n];
295 foo(X);
296 }
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]297</pre></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]298
Misha Brukman6df9e2c2004-05-12 21:46:05 +0000[diff] [blame]299<li>Initialization of global union variables can only be done <a
300href="http://llvm.cs.uiuc.edu/bugs/show_bug.cgi?id=162">with the largest union
301member</a>.</li>
Chris Lattnerf580cdc2004-03-16 21:39:04 +0000[diff] [blame]302
Misha Brukmana7aadf12004-04-19 02:56:49 +0000[diff] [blame]303<li><a href="http://llvm.cs.uiuc.edu/PR244">[llvm-gcc] Error when an implicitly
304external function is re-declared as static</a></li>
Chris Lattnerf580cdc2004-03-16 21:39:04 +0000[diff] [blame]305
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]306</ul>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]307</div>
308
309<!-- _______________________________________________________________________ -->
310<div class="doc_subsubsection">
311 Notes
312</div>
313
314<div class="doc_text">
315
316<ul>
317
318<li>Inline assembly is not yet supported.</li>
Chris Lattnere01fcfb2003-10-27 18:30:37 +0000[diff] [blame]319
320<li>"long double" is transformed by the front-end into "double". There is no
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]321support for floating point data types of any size other than 32 and 64
322bits.</li>
323
324<li>The following Unix system functionality has not been tested and may not
325work:
Misha Brukmane0c891c2003-11-22 01:00:11 +0000[diff] [blame]326 <ol>
327 <li><tt>sigsetjmp</tt>, <tt>siglongjmp</tt> - These are not turned into the
328 appropriate <tt>invoke</tt>/<tt>unwind</tt> instructions. Note that
329 <tt>setjmp</tt> and <tt>longjmp</tt> <em>are</em> compiled correctly.
330 <li><tt>getcontext</tt>, <tt>setcontext</tt>, <tt>makecontext</tt>
331 - These functions have not been tested.
332 </ol></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]333
334<li>Although many GCC extensions are supported, some are not. In particular,
335 the following extensions are known to <b>not be</b> supported:
336 <ol>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]337 <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]338 <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>
339 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Constructing-Calls.html#Constructing%20Calls">Constructing Calls</a>: Dispatching a call to another function.</li>
340 <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]341 <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]342 <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>
343 <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]344 <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>
345 <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>
346 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Thread-Local.html#Thread-Local">Thread-Local</a>: Per-thread variables.</li>
347 <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]348 </ol>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]349
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]350 <p>The following GCC extensions are <b>partially</b> supported. An ignored
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]351 attribute means that the LLVM compiler ignores the presence of the attribute,
352 but the code should still work. An unsupported attribute is one which is
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]353 ignored by the LLVM compiler and will cause a different interpretation of
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]354 the program.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]355
356 <ol>
357 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Length.html#Variable%20Length">Variable Length</a>:
358 Arrays whose length is computed at run time.<br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]359 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]360
361 <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]362
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]363 Declaring that functions have no side effects or that they can never
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]364 return.<br>
365
366 <b>Supported:</b> <tt>format</tt>, <tt>format_arg</tt>, <tt>non_null</tt>,
367 <tt>constructor</tt>, <tt>destructor</tt>, <tt>unused</tt>,
368 <tt>deprecated</tt>, <tt>warn_unused_result</tt>, <tt>weak</tt><br>
369
370 <b>Ignored:</b> <tt>noreturn</tt>, <tt>noinline</tt>,
371 <tt>always_inline</tt>, <tt>pure</tt>, <tt>const</tt>, <tt>nothrow</tt>,
372 <tt>malloc</tt>, <tt>no_instrument_function</tt>, <tt>cdecl</tt><br>
373
374 <b>Unsupported:</b> <tt>used</tt>, <tt>section</tt>, <tt>alias</tt>,
375 <tt>visibility</tt>, <tt>regparm</tt>, <tt>stdcall</tt>,
376 <tt>fastcall</tt>, all other target specific attributes</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]377
378 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Attributes.html#Variable%20Attributes">Variable Attributes</a>:
379 Specifying attributes of variables.<br>
380 <b>Supported:</b> <tt>cleanup</tt>, <tt>common</tt>, <tt>nocommon</tt>,
381 <tt>deprecated</tt>, <tt>transparent_union</tt>,
382 <tt>unused</tt>, <tt>weak</tt><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]383
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]384 <b>Unsupported:</b> <tt>aligned</tt>, <tt>mode</tt>, <tt>packed</tt>,
385 <tt>section</tt>, <tt>shared</tt>, <tt>tls_model</tt>,
386 <tt>vector_size</tt>, <tt>dllimport</tt>,
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]387 <tt>dllexport</tt>, all target specific attributes.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]388
Misha Brukmanc4b7bee2003-12-12 04:37:31 +0000[diff] [blame]389 <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]390 <b>Supported:</b> <tt>transparent_union</tt>, <tt>unused</tt>,
Misha Brukmanc4b7bee2003-12-12 04:37:31 +0000[diff] [blame]391 <tt>deprecated</tt>, <tt>may_alias</tt><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]392
393 <b>Unsupported:</b> <tt>aligned</tt>, <tt>packed</tt>,
394 all target specific attributes.</li>
395
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]396 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html#Other%20Builtins">Other Builtins</a>:
397 Other built-in functions.<br>
398 We support all builtins which have a C language equivalent (e.g.,
399 <tt>__builtin_cos</tt>), <tt>__builtin_alloca</tt>,
400 <tt>__builtin_types_compatible_p</tt>, <tt>__builtin_choose_expr</tt>,
Chris Lattnerceebeb62004-06-18 06:26:29 +0000[diff] [blame]401 <tt>__builtin_constant_p</tt>, and <tt>__builtin_expect</tt>
402 (currently ignored). We also support builtins for ISO C99 floating
403 point comparison macros (e.g., <tt>__builtin_islessequal</tt>).</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]404 </ol>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]405
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]406 <p>The following extensions <b>are</b> known to be supported:</p>
407
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]408 <ol>
Chris Lattner7fe97dd2004-03-16 08:54:07 +0000[diff] [blame]409 <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]410 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html#Statement%20Exprs">Statement Exprs</a>: Putting statements and declarations inside expressions.</li>
411 <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]412 <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]413 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Conditionals.html#Conditionals">Conditionals</a>: Omitting the middle operand of a <code>?:</code> expression.</li>
414 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Long-Long.html#Long%20Long">Long Long</a>: Double-word integers.</li>
415 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Complex.html#Complex">Complex</a>: Data types for complex numbers.</li>
416 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Hex-Floats.html#Hex%20Floats">Hex Floats</a>:Hexadecimal floating-point constants.</li>
417 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html#Zero%20Length">Zero Length</a>: Zero-length arrays.</li>
418 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Empty-Structures.html#Empty%20Structures">Empty Structures</a>: Structures with no members.</li>
419 <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>
420 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Escaped-Newlines.html#Escaped%20Newlines">Escaped Newlines</a>: Slightly looser rules for escaped newlines.</li>
421 <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]422 <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]423 <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]424 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Compound-Literals.html#Compound%20Literals">Compound Literals</a>: Compound literals give structures, unions,
425or arrays as values.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]426 <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]427 <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]428 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Case-Ranges.html#Case%20Ranges">Case Ranges</a>: `case 1 ... 9' and such.</li>
429 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Mixed-Declarations.html#Mixed%20Declarations">Mixed Declarations</a>: Mixing declarations and code.</li>
430 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Function-Prototypes.html#Function%20Prototypes">Function Prototypes</a>: Prototype declarations and old-style definitions.</li>
431 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/C---Comments.html#C++%20Comments">C++ Comments</a>: C++ comments are recognized.</li>
432 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Dollar-Signs.html#Dollar%20Signs">Dollar Signs</a>: Dollar sign is allowed in identifiers.</li>
433 <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>
434 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Alignment.html#Alignment">Alignment</a>: Inquiring about the alignment of a type or variable.</li>
435 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Inline.html#Inline">Inline</a>: Defining inline functions (as fast as macros).</li>
436 <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>
437 <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>
438 <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]439 <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]440 <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>
441 <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]442 </ol></li>
443
444</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]445
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]446<p>If you run into GCC extensions which have not been included in any of these
447lists, please let us know (also including whether or not they work).</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]448
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]449</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]450
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]451<!-- ======================================================================= -->
452<div class="doc_subsection">
453 <a name="c++-fe">Known problems with the C++ front-end</a>
454</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]455
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]456<div class="doc_text">
457
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]458<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]459has not been tested as thoroughly as the C front-end. It has been tested and
460works for a number of non-trivial programs, but there may be lurking bugs.
461Please report any bugs or problems.</p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]462
463</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]464
465<!-- _______________________________________________________________________ -->
Chris Lattner3a51be12004-02-14 04:12:41 +0000[diff] [blame]466<div class="doc_subsubsection">Bugs</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]467
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]468<div class="doc_text">
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]469
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]470<ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]471<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]472 front-end</a>.</li>
Chris Lattner7962f712004-07-17 02:04:41 +0000[diff] [blame]473
Chris Lattnerd5713882004-08-02 20:28:44 +0000[diff] [blame]474<li><b>IA-64 specific</b>: The C++ front-end does not use <a
475href="http://llvm.cs.uiuc.edu/PR406">IA64 ABI compliant layout of v-tables</a>.
Chris Lattner7962f712004-07-17 02:04:41 +0000[diff] [blame]476In particular, it just stores function pointers instead of function
477descriptors in the vtable. This bug prevents mixing C++ code compiled with
Chris Lattner04db8082004-08-02 20:29:51 +0000[diff] [blame]478LLVM with C++ objects compiled by other C++ compilers.</li>
Chris Lattner7962f712004-07-17 02:04:41 +0000[diff] [blame]479
Chris Lattnerd5713882004-08-02 20:28:44 +0000[diff] [blame]480</ul>
481
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]482</div>
483
484<!-- _______________________________________________________________________ -->
485<div class="doc_subsubsection">
486 Notes
487</div>
488
489<div class="doc_text">
490
491<ul>
Chris Lattnere01fcfb2003-10-27 18:30:37 +0000[diff] [blame]492
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]493<li>The C++ front-end is based on a pre-release of the GCC 3.4 C++ parser. This
494parser is significantly more standards compliant (and picky) than prior GCC
495versions. For more information, see the C++ section of the <a
Chris Lattner9e848092003-12-12 04:25:33 +0000[diff] [blame]496href="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]497
498<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]499 performed. In particular, destructors for objects in the <tt>longjmp</tt>ing
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]500 function and in the <tt>setjmp</tt> receiver function may not be run.
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]501 Objects in intervening stack frames will be destroyed, however (which is
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]502 better than most compilers).</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]503
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]504<li>The LLVM C++ front-end follows the <a
505 href="http://www.codesourcery.com/cxx-abi">Itanium C++ ABI</a>.
506 This document, which is not Itanium specific, specifies a standard for name
507 mangling, class layout, v-table layout, RTTI formats, and other C++
508 representation issues. Because we use this API, code generated by the LLVM
509 compilers should be binary compatible with machine code generated by other
510 Itanium ABI C++ compilers (such as G++, the Intel and HP compilers, etc).
511 <i>However</i>, the exception handling mechanism used by LLVM is very
512 different from the model used in the Itanium ABI, so <b>exceptions will not
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]513 interact correctly</b>. </li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]514
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]515</ul>
Chris Lattnerfcc54b32003-10-07 22:14:37 +0000[diff] [blame]516
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]517</div>
518
519<!-- ======================================================================= -->
520<div class="doc_subsection">
521 <a name="x86-be">Known problems with the X86 back-end</a>
522</div>
523
524<div class="doc_text">
525
526<ul>
Chris Lattnerd5713882004-08-02 20:28:44 +0000[diff] [blame]527 <li>none yet</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]528</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]529
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]530</div>
531
532<!-- ======================================================================= -->
533<div class="doc_subsection">
Misha Brukmanadb1c392004-07-12 16:55:41 +0000[diff] [blame]534 <a name="sparcv9-be">Known problems with the SparcV9 back-end</a>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]535</div>
536
537<div class="doc_text">
538
539<ul>
Misha Brukmanadb1c392004-07-12 16:55:41 +0000[diff] [blame]540<li><a href="http://llvm.cs.uiuc.edu/PR60">[sparcv9] SparcV9 backend miscompiles
541several programs in the LLVM test suite</a></li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]542</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]543
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]544</div>
545
546<!-- ======================================================================= -->
547<div class="doc_subsection">
548 <a name="c-be">Known problems with the C back-end</a>
549</div>
550
551<div class="doc_text">
552
553<ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]554
555<li>The C back-end produces code that violates the ANSI C Type-Based Alias
556Analysis rules. As such, special options may be necessary to compile the code
557(for example, GCC requires the <tt>-fno-strict-aliasing</tt> option). This
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]558problem probably cannot be fixed.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]559
Chris Lattnere84843b2003-10-20 19:05:03 +0000[diff] [blame]560<li><a href="http://llvm.cs.uiuc.edu/PR33">Initializers for global variables</a>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]561cannot include special floating point numbers like Not-A-Number or
562Infinity.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]563
Chris Lattner2855ecd2003-11-04 20:06:53 +0000[diff] [blame]564<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]565supported</a>. This should not affect LLVM produced by the C or C++
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]566frontends.</li>
Chris Lattner2af46052003-10-24 04:03:19 +0000[diff] [blame]567
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]568</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]569
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]570</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]571
572<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]573<div class="doc_section">
574 <a name="additionalinfo">Additional Information</a>
575</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]576<!-- *********************************************************************** -->
577
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]578<div class="doc_text">
579
580<p>A wide variety of additional information is available on the LLVM web page,
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]581including mailing lists and publications describing algorithms and components
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]582implemented in LLVM. The web page also contains versions of the API
583documentation which is up-to-date with the CVS version of the source code. You
584can access versions of these documents specific to this release by going into
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]585the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]586
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]587<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]588us via the <a href="http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev">mailing
589lists</a>.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]590
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]591</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]592
593<!-- *********************************************************************** -->
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]594
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]595<hr>
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]596<address>
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Misha Brukmane0c891c2003-11-22 01:00:11 +0000[diff] [blame]602 <a href="http://llvm.cs.uiuc.edu">The LLVM Compiler Infrastructure</a><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]603 Last modified: $Date$
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