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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>
Reid Spencerb810d5f2004-08-27 00:48:26 +0000[diff] [blame]162<li><a href="http://llvm.org/PR430">[bcwriter] Empty compaction tables
163 defined</a></li>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]164</ol>
165
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]166<p>Bugs in the C/C++ front-end:</p>
167
168<ol>
Chris Lattner5c3389a2004-08-16 00:20:18 +0000[diff] [blame]169<li></li>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]170</ol>
Brian Gaekee77c8e72004-08-24 07:43:48 +0000[diff] [blame]171
172<p>Bugs fixed in the Sparc V9 back-end:</p>
173
174<ol>
175<li><a href="http://llvm.org/PR428">[sparcv9] regalloc assertion
176 failure with certain indirect calls</a></li>
177</ol>
178
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]179</div>
Reid Spencer8e0262f2004-05-23 17:23:13 +0000[diff] [blame]180
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]181<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]182<div class="doc_section">
183 <a name="portability">Portability and Supported Platforms</a>
184</div>
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]185<!-- *********************************************************************** -->
186
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]187<div class="doc_text">
188
Chris Lattner4654bdb2004-06-01 18:22:41 +0000[diff] [blame]189<p>LLVM is known to work in the following platforms:</p>
190
191<ul>
192<li>Intel and AMD machines running Red Hat Linux and FreeBSD (and probably
193 other unix-like systems).</li>
194<li>Sun UltraSPARC workstations running Solaris 8.</li>
Chris Lattner4654bdb2004-06-01 18:22:41 +0000[diff] [blame]195<li>Intel and AMD machines running on Win32 with the Cygwin libraries.</li>
Chris Lattnere58d3562004-08-05 21:53:13 +0000[diff] [blame]196<li>PowerPC-based Mac OS X boxes, running 10.2 and above. Note that no JIT
197support is available yet, and LLC support is beta. The C backend can be used
198to produce stable code for this platform.</li>
Chris Lattner4654bdb2004-06-01 18:22:41 +0000[diff] [blame]199</ul>
200
Brian Gaekeb0fd7612004-05-09 05:28:35 +0000[diff] [blame]201<p>The core LLVM infrastructure uses
202<a href="http://www.gnu.org/software/autoconf/">GNU autoconf</a> to adapt itself
203to the machine and operating system on which it is built. However, minor
204porting may be required to get LLVM to work on new platforms. We welcome your
205portability patches and reports of successful builds or error messages.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]206
Chris Lattner4654bdb2004-06-01 18:22:41 +0000[diff] [blame]207<p>Note that the LLVM build system does not currently support directories with
208spaces on them when running on Win32/cygwin. We strongly recommend running
209LLVM and the C frontend out of a top-level directory without spaces (e.g.,
Chris Lattner74032a52004-06-01 19:41:30 +0000[diff] [blame]210<tt>/cygdrive/c/llvm</tt>). Also, make sure to install <b>all</b> of the
211cygwin packages. By default, many important tools are not installed that
Chris Lattner5aff3552004-08-16 20:20:46 +0000[diff] [blame]212are needed by the LLVM build process or test suite (e.g., /bin/time). Finally,
213please make sure that there are no directories with spaces in them in your
214PATH environment variable.</p>
Chris Lattner4654bdb2004-06-01 18:22:41 +0000[diff] [blame]215
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]216</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]217
218<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]219<div class="doc_section">
220 <a name="knownproblems">Known Problems</a>
221</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]222<!-- *********************************************************************** -->
223
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]224<div class="doc_text">
225
226<p>This section contains all known problems with the LLVM system, listed by
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]227component. As new problems are discovered, they will be added to these
Chris Lattner5eccca42003-12-12 21:22:16 +0000[diff] [blame]228sections. If you run into a problem, please check the <a
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]229href="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]230there isn't already one.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]231
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]232</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]233
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]234<!-- ======================================================================= -->
235<div class="doc_subsection">
236 <a name="experimental">Experimental features included with this release</a>
237</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]238
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]239<div class="doc_text">
240
Misha Brukman6df9e2c2004-05-12 21:46:05 +0000[diff] [blame]241<p>The following components of this LLVM release are either untested, known to
242be broken or unreliable, or are in early development. These components should
243not be relied on, and bugs should not be filed against them, but they may be
244useful to some people. In particular, if you would like to work on one of these
245components, please contact us on the llvmdev list.</p>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]246
247<ul>
Misha Brukman94118752004-08-05 21:04:03 +0000[diff] [blame]248<li>The PowerPC backend is incomplete and is known to miscompile several SPEC
249benchmarks. The file <tt>llvm/lib/Target/PowerPC/README.txt</tt> has
250details.</li>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]251<li>The following passes are incomplete or buggy: <tt>-pgmdep, -memdep,
Chris Lattnercbabe702004-06-28 00:44:45 +0000[diff] [blame]252 -ipmodref, -cee</tt></li>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]253<li>The <tt>-pre</tt> pass is incomplete (there are cases it doesn't handle that
254 it should) and not thoroughly tested.</li>
255<li>The <tt>llvm-ar</tt> tool is incomplete and probably buggy.</li>
256<li>The <tt>llvm-db</tt> tool is in a very early stage of development.</li>
257</ul>
258
259</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]260
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]261<!-- ======================================================================= -->
262<div class="doc_subsection">
263 <a name="core">Known problems with the LLVM Core</a>
264</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]265
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]266<div class="doc_text">
267
268<ul>
269
270<li>In the JIT, <tt>dlsym</tt> on a symbol compiled by the JIT will not
271work.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]272
273<li>The JIT does not use mutexes to protect its internal data structures. As
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]274such, execution of a threaded program could cause these data structures to be
275corrupted.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]276
Chris Lattnereb673962004-08-08 03:33:07 +0000[diff] [blame]277<li>Linking in static archive files (.a files) is slow (there is no symbol
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]278table in the archive).</li>
Chris Lattner2855ecd2003-11-04 20:06:53 +0000[diff] [blame]279
Misha Brukmana7aadf12004-04-19 02:56:49 +0000[diff] [blame]280<li>The gccld program <a href="http://llvm.cs.uiuc.edu/PR139">does not link
281objects/archives in the order specified on the command line.</a></li>
Chris Lattner2e6fcaf2004-02-15 23:09:07 +0000[diff] [blame]282
283<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]284values live across a setjmp as volatile</a>. This missing feature only affects
Chris Lattner2e6fcaf2004-02-15 23:09:07 +0000[diff] [blame]285targets whose setjmp/longjmp libraries do not save and restore the entire
286register file.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]287</ul>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]288</div>
289
290<!-- ======================================================================= -->
291<div class="doc_subsection">
292 <a name="c-fe">Known problems with the C front-end</a>
293</div>
Chris Lattner47588f92003-10-02 05:07:23 +0000[diff] [blame]294
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]295<!-- _______________________________________________________________________ -->
Chris Lattnerb40efb32003-12-14 05:03:43 +0000[diff] [blame]296<div class="doc_subsubsection">Bugs</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]297
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]298<div class="doc_text">
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]299<ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]300<li>C99 Variable sized arrays do not release stack memory when they go out of
301 scope. Thus, the following program may run out of stack space:
302<pre>
303 for (i = 0; i != 1000000; ++i) {
304 int X[n];
305 foo(X);
306 }
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]307</pre></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]308
Misha Brukman6df9e2c2004-05-12 21:46:05 +0000[diff] [blame]309<li>Initialization of global union variables can only be done <a
310href="http://llvm.cs.uiuc.edu/bugs/show_bug.cgi?id=162">with the largest union
311member</a>.</li>
Chris Lattnerf580cdc2004-03-16 21:39:04 +0000[diff] [blame]312
Misha Brukmana7aadf12004-04-19 02:56:49 +0000[diff] [blame]313<li><a href="http://llvm.cs.uiuc.edu/PR244">[llvm-gcc] Error when an implicitly
314external function is re-declared as static</a></li>
Chris Lattnerf580cdc2004-03-16 21:39:04 +0000[diff] [blame]315
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]316</ul>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]317</div>
318
319<!-- _______________________________________________________________________ -->
320<div class="doc_subsubsection">
321 Notes
322</div>
323
324<div class="doc_text">
325
326<ul>
327
328<li>Inline assembly is not yet supported.</li>
Chris Lattnere01fcfb2003-10-27 18:30:37 +0000[diff] [blame]329
330<li>"long double" is transformed by the front-end into "double". There is no
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]331support for floating point data types of any size other than 32 and 64
332bits.</li>
333
334<li>The following Unix system functionality has not been tested and may not
335work:
Misha Brukmane0c891c2003-11-22 01:00:11 +0000[diff] [blame]336 <ol>
337 <li><tt>sigsetjmp</tt>, <tt>siglongjmp</tt> - These are not turned into the
338 appropriate <tt>invoke</tt>/<tt>unwind</tt> instructions. Note that
339 <tt>setjmp</tt> and <tt>longjmp</tt> <em>are</em> compiled correctly.
340 <li><tt>getcontext</tt>, <tt>setcontext</tt>, <tt>makecontext</tt>
341 - These functions have not been tested.
342 </ol></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]343
344<li>Although many GCC extensions are supported, some are not. In particular,
345 the following extensions are known to <b>not be</b> supported:
346 <ol>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]347 <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]348 <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>
349 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Constructing-Calls.html#Constructing%20Calls">Constructing Calls</a>: Dispatching a call to another function.</li>
350 <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]351 <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]352 <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>
353 <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]354 <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>
355 <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>
356 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Thread-Local.html#Thread-Local">Thread-Local</a>: Per-thread variables.</li>
357 <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]358 </ol>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]359
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]360 <p>The following GCC extensions are <b>partially</b> supported. An ignored
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]361 attribute means that the LLVM compiler ignores the presence of the attribute,
362 but the code should still work. An unsupported attribute is one which is
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]363 ignored by the LLVM compiler and will cause a different interpretation of
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]364 the program.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]365
366 <ol>
367 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Length.html#Variable%20Length">Variable Length</a>:
368 Arrays whose length is computed at run time.<br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]369 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]370
371 <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]372
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]373 Declaring that functions have no side effects or that they can never
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]374 return.<br>
375
376 <b>Supported:</b> <tt>format</tt>, <tt>format_arg</tt>, <tt>non_null</tt>,
377 <tt>constructor</tt>, <tt>destructor</tt>, <tt>unused</tt>,
378 <tt>deprecated</tt>, <tt>warn_unused_result</tt>, <tt>weak</tt><br>
379
380 <b>Ignored:</b> <tt>noreturn</tt>, <tt>noinline</tt>,
381 <tt>always_inline</tt>, <tt>pure</tt>, <tt>const</tt>, <tt>nothrow</tt>,
382 <tt>malloc</tt>, <tt>no_instrument_function</tt>, <tt>cdecl</tt><br>
383
384 <b>Unsupported:</b> <tt>used</tt>, <tt>section</tt>, <tt>alias</tt>,
385 <tt>visibility</tt>, <tt>regparm</tt>, <tt>stdcall</tt>,
386 <tt>fastcall</tt>, all other target specific attributes</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]387
388 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Attributes.html#Variable%20Attributes">Variable Attributes</a>:
389 Specifying attributes of variables.<br>
390 <b>Supported:</b> <tt>cleanup</tt>, <tt>common</tt>, <tt>nocommon</tt>,
391 <tt>deprecated</tt>, <tt>transparent_union</tt>,
392 <tt>unused</tt>, <tt>weak</tt><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]393
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]394 <b>Unsupported:</b> <tt>aligned</tt>, <tt>mode</tt>, <tt>packed</tt>,
395 <tt>section</tt>, <tt>shared</tt>, <tt>tls_model</tt>,
396 <tt>vector_size</tt>, <tt>dllimport</tt>,
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]397 <tt>dllexport</tt>, all target specific attributes.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]398
Misha Brukmanc4b7bee2003-12-12 04:37:31 +0000[diff] [blame]399 <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]400 <b>Supported:</b> <tt>transparent_union</tt>, <tt>unused</tt>,
Misha Brukmanc4b7bee2003-12-12 04:37:31 +0000[diff] [blame]401 <tt>deprecated</tt>, <tt>may_alias</tt><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]402
403 <b>Unsupported:</b> <tt>aligned</tt>, <tt>packed</tt>,
404 all target specific attributes.</li>
405
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]406 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html#Other%20Builtins">Other Builtins</a>:
407 Other built-in functions.<br>
408 We support all builtins which have a C language equivalent (e.g.,
409 <tt>__builtin_cos</tt>), <tt>__builtin_alloca</tt>,
410 <tt>__builtin_types_compatible_p</tt>, <tt>__builtin_choose_expr</tt>,
Chris Lattnerceebeb62004-06-18 06:26:29 +0000[diff] [blame]411 <tt>__builtin_constant_p</tt>, and <tt>__builtin_expect</tt>
412 (currently ignored). We also support builtins for ISO C99 floating
413 point comparison macros (e.g., <tt>__builtin_islessequal</tt>).</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]414 </ol>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]415
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]416 <p>The following extensions <b>are</b> known to be supported:</p>
417
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]418 <ol>
Chris Lattner7fe97dd2004-03-16 08:54:07 +0000[diff] [blame]419 <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]420 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html#Statement%20Exprs">Statement Exprs</a>: Putting statements and declarations inside expressions.</li>
421 <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]422 <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]423 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Conditionals.html#Conditionals">Conditionals</a>: Omitting the middle operand of a <code>?:</code> expression.</li>
424 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Long-Long.html#Long%20Long">Long Long</a>: Double-word integers.</li>
425 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Complex.html#Complex">Complex</a>: Data types for complex numbers.</li>
426 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Hex-Floats.html#Hex%20Floats">Hex Floats</a>:Hexadecimal floating-point constants.</li>
427 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html#Zero%20Length">Zero Length</a>: Zero-length arrays.</li>
428 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Empty-Structures.html#Empty%20Structures">Empty Structures</a>: Structures with no members.</li>
429 <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>
430 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Escaped-Newlines.html#Escaped%20Newlines">Escaped Newlines</a>: Slightly looser rules for escaped newlines.</li>
431 <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]432 <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]433 <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]434 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Compound-Literals.html#Compound%20Literals">Compound Literals</a>: Compound literals give structures, unions,
435or arrays as values.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]436 <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]437 <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]438 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Case-Ranges.html#Case%20Ranges">Case Ranges</a>: `case 1 ... 9' and such.</li>
439 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Mixed-Declarations.html#Mixed%20Declarations">Mixed Declarations</a>: Mixing declarations and code.</li>
440 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Function-Prototypes.html#Function%20Prototypes">Function Prototypes</a>: Prototype declarations and old-style definitions.</li>
441 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/C---Comments.html#C++%20Comments">C++ Comments</a>: C++ comments are recognized.</li>
442 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Dollar-Signs.html#Dollar%20Signs">Dollar Signs</a>: Dollar sign is allowed in identifiers.</li>
443 <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>
444 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Alignment.html#Alignment">Alignment</a>: Inquiring about the alignment of a type or variable.</li>
445 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Inline.html#Inline">Inline</a>: Defining inline functions (as fast as macros).</li>
446 <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>
447 <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>
448 <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]449 <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]450 <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>
451 <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]452 </ol></li>
453
454</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]455
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]456<p>If you run into GCC extensions which have not been included in any of these
457lists, please let us know (also including whether or not they work).</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]458
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]459</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]460
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]461<!-- ======================================================================= -->
462<div class="doc_subsection">
463 <a name="c++-fe">Known problems with the C++ front-end</a>
464</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]465
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]466<div class="doc_text">
467
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]468<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]469has not been tested as thoroughly as the C front-end. It has been tested and
470works for a number of non-trivial programs, but there may be lurking bugs.
471Please report any bugs or problems.</p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]472
473</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]474
475<!-- _______________________________________________________________________ -->
Chris Lattner3a51be12004-02-14 04:12:41 +0000[diff] [blame]476<div class="doc_subsubsection">Bugs</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]477
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]478<div class="doc_text">
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]479
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]480<ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]481<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]482 front-end</a>.</li>
Chris Lattner7962f712004-07-17 02:04:41 +0000[diff] [blame]483
Chris Lattnerd5713882004-08-02 20:28:44 +0000[diff] [blame]484<li><b>IA-64 specific</b>: The C++ front-end does not use <a
485href="http://llvm.cs.uiuc.edu/PR406">IA64 ABI compliant layout of v-tables</a>.
Chris Lattner7962f712004-07-17 02:04:41 +0000[diff] [blame]486In particular, it just stores function pointers instead of function
487descriptors in the vtable. This bug prevents mixing C++ code compiled with
Chris Lattner04db8082004-08-02 20:29:51 +0000[diff] [blame]488LLVM with C++ objects compiled by other C++ compilers.</li>
Chris Lattner7962f712004-07-17 02:04:41 +0000[diff] [blame]489
Chris Lattnerd5713882004-08-02 20:28:44 +0000[diff] [blame]490</ul>
491
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]492</div>
493
494<!-- _______________________________________________________________________ -->
495<div class="doc_subsubsection">
496 Notes
497</div>
498
499<div class="doc_text">
500
501<ul>
Chris Lattnere01fcfb2003-10-27 18:30:37 +0000[diff] [blame]502
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]503<li>The C++ front-end is based on a pre-release of the GCC 3.4 C++ parser. This
504parser is significantly more standards compliant (and picky) than prior GCC
505versions. For more information, see the C++ section of the <a
Chris Lattner9e848092003-12-12 04:25:33 +0000[diff] [blame]506href="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]507
508<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]509 performed. In particular, destructors for objects in the <tt>longjmp</tt>ing
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]510 function and in the <tt>setjmp</tt> receiver function may not be run.
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]511 Objects in intervening stack frames will be destroyed, however (which is
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]512 better than most compilers).</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]513
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]514<li>The LLVM C++ front-end follows the <a
515 href="http://www.codesourcery.com/cxx-abi">Itanium C++ ABI</a>.
516 This document, which is not Itanium specific, specifies a standard for name
517 mangling, class layout, v-table layout, RTTI formats, and other C++
518 representation issues. Because we use this API, code generated by the LLVM
519 compilers should be binary compatible with machine code generated by other
520 Itanium ABI C++ compilers (such as G++, the Intel and HP compilers, etc).
521 <i>However</i>, the exception handling mechanism used by LLVM is very
522 different from the model used in the Itanium ABI, so <b>exceptions will not
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]523 interact correctly</b>. </li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]524
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]525</ul>
Chris Lattnerfcc54b32003-10-07 22:14:37 +0000[diff] [blame]526
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]527</div>
528
529<!-- ======================================================================= -->
530<div class="doc_subsection">
531 <a name="x86-be">Known problems with the X86 back-end</a>
532</div>
533
534<div class="doc_text">
535
536<ul>
Chris Lattnerd5713882004-08-02 20:28:44 +0000[diff] [blame]537 <li>none yet</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]538</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]539
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]540</div>
541
542<!-- ======================================================================= -->
543<div class="doc_subsection">
Misha Brukmanadb1c392004-07-12 16:55:41 +0000[diff] [blame]544 <a name="sparcv9-be">Known problems with the SparcV9 back-end</a>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]545</div>
546
547<div class="doc_text">
548
549<ul>
Misha Brukmanadb1c392004-07-12 16:55:41 +0000[diff] [blame]550<li><a href="http://llvm.cs.uiuc.edu/PR60">[sparcv9] SparcV9 backend miscompiles
551several programs in the LLVM test suite</a></li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]552</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]553
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]554</div>
555
556<!-- ======================================================================= -->
557<div class="doc_subsection">
558 <a name="c-be">Known problems with the C back-end</a>
559</div>
560
561<div class="doc_text">
562
563<ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]564
565<li>The C back-end produces code that violates the ANSI C Type-Based Alias
566Analysis rules. As such, special options may be necessary to compile the code
567(for example, GCC requires the <tt>-fno-strict-aliasing</tt> option). This
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]568problem probably cannot be fixed.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]569
Chris Lattnere84843b2003-10-20 19:05:03 +0000[diff] [blame]570<li><a href="http://llvm.cs.uiuc.edu/PR33">Initializers for global variables</a>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]571cannot include special floating point numbers like Not-A-Number or
572Infinity.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]573
Chris Lattner2855ecd2003-11-04 20:06:53 +0000[diff] [blame]574<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]575supported</a>. This should not affect LLVM produced by the C or C++
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]576frontends.</li>
Chris Lattner2af46052003-10-24 04:03:19 +0000[diff] [blame]577
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]578</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]579
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]580</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]581
582<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]583<div class="doc_section">
584 <a name="additionalinfo">Additional Information</a>
585</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]586<!-- *********************************************************************** -->
587
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]588<div class="doc_text">
589
590<p>A wide variety of additional information is available on the LLVM web page,
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]591including mailing lists and publications describing algorithms and components
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]592implemented in LLVM. The web page also contains versions of the API
593documentation which is up-to-date with the CVS version of the source code. You
594can access versions of these documents specific to this release by going into
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]595the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]596
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]597<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]598us via the <a href="http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev">mailing
599lists</a>.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]600
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]601</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]602
603<!-- *********************************************************************** -->
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]604
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]605<hr>
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]606<address>
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611
Misha Brukmane0c891c2003-11-22 01:00:11 +0000[diff] [blame]612 <a href="http://llvm.cs.uiuc.edu">The LLVM Compiler Infrastructure</a><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]613 Last modified: $Date$
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