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Chris Lattner163c3262004-08-16 00:20:18 +0000[diff] [blame]6 <title>LLVM 1.4 Release Notes</title>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]7</head>
8<body>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]9
Chris Lattner163c3262004-08-16 00:20:18 +0000[diff] [blame]10<div class="doc_title">LLVM 1.4 Release Notes</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]11
12<ol>
Misha Brukman80731b92003-11-22 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 Lattner77a51732004-04-30 22:17:12 +0000[diff] [blame]15 <li><a href="GettingStarted.html">Installation Instructions</a></li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]16 <li><a href="#portability">Portability and Supported Platforms</a></li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]17 <li><a href="#knownproblems">Known Problems</a>
18 <ul>
Chris Lattner1a7e43c2004-04-01 00:41:31 +0000[diff] [blame]19 <li><a href="#experimental">Experimental features included in this
20 release</a>
Chris Lattner3d482502003-10-02 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 Brukmana516e992004-07-12 16:55:41 +0000[diff] [blame]25 <li><a href="#sparcv9-be">Known problems with the SparcV9 Back-end</a>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]26 <li><a href="#c-be">Known problems with the C back-end</a>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]27 </ul></li>
28 <li><a href="#additionalinfo">Additional Information</a></li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]29</ol>
30
Chris Lattner020e1fc2004-05-23 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 Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]33</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]34
35<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]36<div class="doc_section">
37 <a name="intro">Introduction</a>
38</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]39<!-- *********************************************************************** -->
40
Misha Brukman80731b92003-11-22 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 Lattner163c3262004-08-16 00:20:18 +0000[diff] [blame]44infrastructure, release 1.4. Here we describe the status of LLVM, including any
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]45known problems and bug fixes from the previous release. The most up-to-date
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]46version of this document can be found on the <a
Chris Lattner163c3262004-08-16 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 Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]48not reading this on the LLVM web pages, you should probably go there because
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]49this document may be updated after the release.</p>
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]50
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]51<p>For more information about LLVM, including information about potentially more
Chris Lattnere7525b52003-10-07 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 Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]55list</a> is a good place to send them.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]56
Chris Lattnere76e9ab2003-12-12 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 Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]60href="http://llvm.cs.uiuc.edu/releases/">releases page</a>.</p>
61
62</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]63
64<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]65<div class="doc_section">
66 <a name="whatsnew">What's New?</a>
67</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]68<!-- *********************************************************************** -->
69
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]70<div class="doc_text">
71
Chris Lattner163c3262004-08-16 00:20:18 +0000[diff] [blame]72<p>This is the fifth public release of the LLVM compiler infrastructure.</p>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]73
Misha Brukmanfa50a222004-05-12 21:46:05 +0000[diff] [blame]74<p> At this time, LLVM is known to correctly compile and run all C &amp; C++
Chris Lattner5cd40922004-08-02 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 Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]78
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]79</div>
80
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]81<!--=========================================================================-->
82<div class="doc_subsubsection">
Chris Lattner8ebf2532004-02-25 16:36:51 +0000[diff] [blame]83<a name="newfeatures">This release implements the following new features:</a>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]84</div>
Chris Lattnere7525b52003-10-07 21:38:31 +0000[diff] [blame]85
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]86<div class="doc_text">
87
Chris Lattnere7525b52003-10-07 21:38:31 +0000[diff] [blame]88<ol>
Chris Lattner163c3262004-08-16 00:20:18 +0000[diff] [blame]89<li></li>
Chris Lattner592db402003-11-19 22:05:38 +0000[diff] [blame]90</ol>
Chris Lattner4491de62003-11-08 04:28:55 +0000[diff] [blame]91
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]92</div>
93
Chris Lattnerba7bd472003-12-06 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 Lattner4491de62003-11-08 04:28:55 +0000[diff] [blame]99
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]100<div class="doc_text">
101
Chris Lattner4491de62003-11-08 04:28:55 +0000[diff] [blame]102<ol>
Chris Lattner163c3262004-08-16 00:20:18 +0000[diff] [blame]103<li><a href="http://llvm.org/PR419">JIT interface should support arbitrary
104 calls</a></li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]105</ol>
Chris Lattnere7525b52003-10-07 21:38:31 +0000[diff] [blame]106
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]107</div>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]108
109<!--=========================================================================-->
110<div class="doc_subsubsection">
Misha Brukman017f2f32004-04-19 02:56:49 +0000[diff] [blame]111<a name="qualityofimp">In this release, the following Quality of Implementation
112issues were fixed:</a>
Chris Lattner4df78f02003-12-20 03:42:11 +0000[diff] [blame]113</div>
114
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]115<div class="doc_text">
116
Chris Lattner4df78f02003-12-20 03:42:11 +0000[diff] [blame]117<ol>
Chris Lattner615ffb82004-08-20 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 Lattner4df78f02003-12-20 03:42:11 +0000[diff] [blame]120</ol>
121
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]122</div>
123
Chris Lattner4df78f02003-12-20 03:42:11 +0000[diff] [blame]124<!--=========================================================================-->
125<div class="doc_subsubsection">
Chris Lattner8ebf2532004-02-25 16:36:51 +0000[diff] [blame]126In this release, the following build problems were fixed:
Brian Gaeke8b05e4f2004-01-16 21:55:04 +0000[diff] [blame]127</div>
128
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]129<div class="doc_text">
Brian Gaeke8b05e4f2004-01-16 21:55:04 +0000[diff] [blame]130<ol>
Chris Lattner163c3262004-08-16 00:20:18 +0000[diff] [blame]131<li></li>
Brian Gaeke8b05e4f2004-01-16 21:55:04 +0000[diff] [blame]132</ol>
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]133</div>
Brian Gaeke8b05e4f2004-01-16 21:55:04 +0000[diff] [blame]134
135<!--=========================================================================-->
136<div class="doc_subsubsection">
Chris Lattner2ad48782004-05-02 04:19:15 +0000[diff] [blame]137<a name="codequality">This release includes the following Code Quality
138improvements:</a>
Chris Lattner23257062004-05-23 20:42:08 +0000[diff] [blame]139</div>
Chris Lattner639579c2003-10-27 17:06:39 +0000[diff] [blame]140
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]141<div class="doc_text">
Chris Lattner639579c2003-10-27 17:06:39 +0000[diff] [blame]142<ol>
Reid Spencer05b9b532004-09-07 17:52:38 +0000[diff] [blame]143 <li><a href="http://llvm.org/PR257">move test/Programs out of the main llvm
144 tree</a></li>
145 <li><a href="http://llvm.org/PR352">include/{Support,Config} ->
146 include/llvm/{Support,Config}</a></li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]147</ol>
Reid Spencer3e58f582004-05-23 17:23:13 +0000[diff] [blame]148</div>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]149
150<!--=========================================================================-->
151<div class="doc_subsubsection">
Misha Brukman017f2f32004-04-19 02:56:49 +0000[diff] [blame]152<a name="bugfix">In this release, the following bugs in the previous release
153were fixed:</a>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]154</div>
155
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]156<div class="doc_text">
157
Chris Lattner5cd40922004-08-02 20:28:44 +0000[diff] [blame]158<p>Bugs fixed in the LLVM Core:</p>
Chris Lattnere7525b52003-10-07 21:38:31 +0000[diff] [blame]159
160<ol>
Chris Lattner59d448f2004-09-15 01:09:25 +0000[diff] [blame^]161<li><a href="http://llvm.org/PR420">[licm] LICM invalidates alias analysis info
162 and uses broken information</a> (optimizer crash)</li>
Reid Spencerf03b47c2004-08-16 16:48:19 +0000[diff] [blame]163<li><a href="http://llvm.org/PR422">[asmwriter] Asmwriter is really slow for
Chris Lattner59d448f2004-09-15 01:09:25 +0000[diff] [blame^]164 functions with lots of values</a></li>
Chris Lattnera10ed3b2004-08-16 05:46:57 +0000[diff] [blame]165<li><a href="http://llvm.org/PR423">[anders-aa] Andersen's AA is completely
166 broken in LLVM 1.3</a></li>
Reid Spencer7d0a1232004-08-27 00:48:26 +0000[diff] [blame]167<li><a href="http://llvm.org/PR430">[bcwriter] Empty compaction tables
168 defined</a></li>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]169</ol>
170
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]171<p>Bugs in the C/C++ front-end:</p>
172
173<ol>
Chris Lattner163c3262004-08-16 00:20:18 +0000[diff] [blame]174<li></li>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]175</ol>
Brian Gaeke730d8d62004-08-24 07:43:48 +0000[diff] [blame]176
177<p>Bugs fixed in the Sparc V9 back-end:</p>
178
179<ol>
180<li><a href="http://llvm.org/PR428">[sparcv9] regalloc assertion
181 failure with certain indirect calls</a></li>
182</ol>
183
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]184</div>
Reid Spencer3e58f582004-05-23 17:23:13 +0000[diff] [blame]185
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]186<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]187<div class="doc_section">
188 <a name="portability">Portability and Supported Platforms</a>
189</div>
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]190<!-- *********************************************************************** -->
191
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]192<div class="doc_text">
193
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]194<p>LLVM is known to work in the following platforms:</p>
195
196<ul>
197<li>Intel and AMD machines running Red Hat Linux and FreeBSD (and probably
198 other unix-like systems).</li>
199<li>Sun UltraSPARC workstations running Solaris 8.</li>
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]200<li>Intel and AMD machines running on Win32 with the Cygwin libraries.</li>
Chris Lattnerd21e3d02004-08-05 21:53:13 +0000[diff] [blame]201<li>PowerPC-based Mac OS X boxes, running 10.2 and above. Note that no JIT
202support is available yet, and LLC support is beta. The C backend can be used
203to produce stable code for this platform.</li>
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]204</ul>
205
Brian Gaekee3e557e2004-05-09 05:28:35 +0000[diff] [blame]206<p>The core LLVM infrastructure uses
207<a href="http://www.gnu.org/software/autoconf/">GNU autoconf</a> to adapt itself
208to the machine and operating system on which it is built. However, minor
209porting may be required to get LLVM to work on new platforms. We welcome your
210portability patches and reports of successful builds or error messages.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]211
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]212<p>Note that the LLVM build system does not currently support directories with
213spaces on them when running on Win32/cygwin. We strongly recommend running
214LLVM and the C frontend out of a top-level directory without spaces (e.g.,
Chris Lattnerce1a3842004-06-01 19:41:30 +0000[diff] [blame]215<tt>/cygdrive/c/llvm</tt>). Also, make sure to install <b>all</b> of the
216cygwin packages. By default, many important tools are not installed that
Chris Lattnera752fce2004-08-16 20:20:46 +0000[diff] [blame]217are needed by the LLVM build process or test suite (e.g., /bin/time). Finally,
218please make sure that there are no directories with spaces in them in your
219PATH environment variable.</p>
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]220
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]221</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]222
223<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]224<div class="doc_section">
225 <a name="knownproblems">Known Problems</a>
226</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]227<!-- *********************************************************************** -->
228
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]229<div class="doc_text">
230
231<p>This section contains all known problems with the LLVM system, listed by
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]232component. As new problems are discovered, they will be added to these
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]233sections. If you run into a problem, please check the <a
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]234href="http://llvm.cs.uiuc.edu/bugs/">LLVM bug database</a> and submit a bug if
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]235there isn't already one.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]236
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]237</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]238
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]239<!-- ======================================================================= -->
240<div class="doc_subsection">
241 <a name="experimental">Experimental features included with this release</a>
242</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]243
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]244<div class="doc_text">
245
Misha Brukmanfa50a222004-05-12 21:46:05 +0000[diff] [blame]246<p>The following components of this LLVM release are either untested, known to
247be broken or unreliable, or are in early development. These components should
248not be relied on, and bugs should not be filed against them, but they may be
249useful to some people. In particular, if you would like to work on one of these
250components, please contact us on the llvmdev list.</p>
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]251
252<ul>
Misha Brukman467ea6b2004-08-05 21:04:03 +0000[diff] [blame]253<li>The PowerPC backend is incomplete and is known to miscompile several SPEC
254benchmarks. The file <tt>llvm/lib/Target/PowerPC/README.txt</tt> has
255details.</li>
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]256<li>The following passes are incomplete or buggy: <tt>-pgmdep, -memdep,
Chris Lattner09f3ac92004-09-14 16:43:13 +0000[diff] [blame]257 -ipmodref, -cee, -branch-combine, -instloops, -paths</tt></li>
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]258<li>The <tt>-pre</tt> pass is incomplete (there are cases it doesn't handle that
259 it should) and not thoroughly tested.</li>
260<li>The <tt>llvm-ar</tt> tool is incomplete and probably buggy.</li>
261<li>The <tt>llvm-db</tt> tool is in a very early stage of development.</li>
262</ul>
263
264</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]265
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]266<!-- ======================================================================= -->
267<div class="doc_subsection">
268 <a name="core">Known problems with the LLVM Core</a>
269</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]270
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]271<div class="doc_text">
272
273<ul>
274
275<li>In the JIT, <tt>dlsym</tt> on a symbol compiled by the JIT will not
276work.</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]277
278<li>The JIT does not use mutexes to protect its internal data structures. As
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]279such, execution of a threaded program could cause these data structures to be
280corrupted.</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]281
Chris Lattnerc0171082004-08-08 03:33:07 +0000[diff] [blame]282<li>Linking in static archive files (.a files) is slow (there is no symbol
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]283table in the archive).</li>
Chris Lattnerc679fbb2003-11-04 20:06:53 +0000[diff] [blame]284
Misha Brukman017f2f32004-04-19 02:56:49 +0000[diff] [blame]285<li>The gccld program <a href="http://llvm.cs.uiuc.edu/PR139">does not link
286objects/archives in the order specified on the command line.</a></li>
Chris Lattneraebc66a2004-02-15 23:09:07 +0000[diff] [blame]287
288<li><a href="http://llvm.cs.uiuc.edu/PR240">The lower-invoke pass does not mark
John Criswell5d6345a2004-03-12 21:29:42 +0000[diff] [blame]289values live across a setjmp as volatile</a>. This missing feature only affects
Chris Lattneraebc66a2004-02-15 23:09:07 +0000[diff] [blame]290targets whose setjmp/longjmp libraries do not save and restore the entire
291register file.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]292</ul>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]293</div>
294
295<!-- ======================================================================= -->
296<div class="doc_subsection">
297 <a name="c-fe">Known problems with the C front-end</a>
298</div>
Chris Lattner178f3db2003-10-02 05:07:23 +0000[diff] [blame]299
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]300<!-- _______________________________________________________________________ -->
Chris Lattner5a8a7282003-12-14 05:03:43 +0000[diff] [blame]301<div class="doc_subsubsection">Bugs</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]302
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]303<div class="doc_text">
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]304<ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]305<li>C99 Variable sized arrays do not release stack memory when they go out of
306 scope. Thus, the following program may run out of stack space:
307<pre>
308 for (i = 0; i != 1000000; ++i) {
309 int X[n];
310 foo(X);
311 }
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]312</pre></li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]313
Misha Brukmanfa50a222004-05-12 21:46:05 +0000[diff] [blame]314<li>Initialization of global union variables can only be done <a
315href="http://llvm.cs.uiuc.edu/bugs/show_bug.cgi?id=162">with the largest union
316member</a>.</li>
Chris Lattner1ab58dd2004-03-16 21:39:04 +0000[diff] [blame]317
Misha Brukman017f2f32004-04-19 02:56:49 +0000[diff] [blame]318<li><a href="http://llvm.cs.uiuc.edu/PR244">[llvm-gcc] Error when an implicitly
319external function is re-declared as static</a></li>
Chris Lattner1ab58dd2004-03-16 21:39:04 +0000[diff] [blame]320
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]321</ul>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]322</div>
323
324<!-- _______________________________________________________________________ -->
325<div class="doc_subsubsection">
326 Notes
327</div>
328
329<div class="doc_text">
330
331<ul>
332
333<li>Inline assembly is not yet supported.</li>
Chris Lattnerd2a74272003-10-27 18:30:37 +0000[diff] [blame]334
335<li>"long double" is transformed by the front-end into "double". There is no
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]336support for floating point data types of any size other than 32 and 64
337bits.</li>
338
339<li>The following Unix system functionality has not been tested and may not
340work:
Misha Brukman7cb4e382003-11-22 01:00:11 +0000[diff] [blame]341 <ol>
342 <li><tt>sigsetjmp</tt>, <tt>siglongjmp</tt> - These are not turned into the
343 appropriate <tt>invoke</tt>/<tt>unwind</tt> instructions. Note that
344 <tt>setjmp</tt> and <tt>longjmp</tt> <em>are</em> compiled correctly.
345 <li><tt>getcontext</tt>, <tt>setcontext</tt>, <tt>makecontext</tt>
346 - These functions have not been tested.
347 </ol></li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]348
349<li>Although many GCC extensions are supported, some are not. In particular,
350 the following extensions are known to <b>not be</b> supported:
351 <ol>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]352 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Local-Labels.html#Local%20Labels">Local Labels</a>: Labels local to a block.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]353 <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>
354 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Constructing-Calls.html#Constructing%20Calls">Constructing Calls</a>: Dispatching a call to another function.</li>
355 <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 Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]356 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Constraints.html#Constraints">Constraints</a>: Constraints for asm operands.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]357 <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>
358 <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 Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]359 <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>
360 <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>
361 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Thread-Local.html#Thread-Local">Thread-Local</a>: Per-thread variables.</li>
362 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Pragmas.html#Pragmas">Pragmas</a>: Pragmas accepted by GCC.</li>
Misha Brukman7cb4e382003-11-22 01:00:11 +0000[diff] [blame]363 </ol>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]364
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]365 <p>The following GCC extensions are <b>partially</b> supported. An ignored
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]366 attribute means that the LLVM compiler ignores the presence of the attribute,
367 but the code should still work. An unsupported attribute is one which is
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]368 ignored by the LLVM compiler and will cause a different interpretation of
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]369 the program.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]370
371 <ol>
372 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Length.html#Variable%20Length">Variable Length</a>:
373 Arrays whose length is computed at run time.<br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]374 Supported, but allocated stack space is not freed until the function returns (noted above).</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]375
376 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html#Function%20Attributes">Function Attributes</a>:
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]377
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]378 Declaring that functions have no side effects or that they can never
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]379 return.<br>
380
381 <b>Supported:</b> <tt>format</tt>, <tt>format_arg</tt>, <tt>non_null</tt>,
382 <tt>constructor</tt>, <tt>destructor</tt>, <tt>unused</tt>,
383 <tt>deprecated</tt>, <tt>warn_unused_result</tt>, <tt>weak</tt><br>
384
385 <b>Ignored:</b> <tt>noreturn</tt>, <tt>noinline</tt>,
386 <tt>always_inline</tt>, <tt>pure</tt>, <tt>const</tt>, <tt>nothrow</tt>,
387 <tt>malloc</tt>, <tt>no_instrument_function</tt>, <tt>cdecl</tt><br>
388
389 <b>Unsupported:</b> <tt>used</tt>, <tt>section</tt>, <tt>alias</tt>,
390 <tt>visibility</tt>, <tt>regparm</tt>, <tt>stdcall</tt>,
391 <tt>fastcall</tt>, all other target specific attributes</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]392
393 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Attributes.html#Variable%20Attributes">Variable Attributes</a>:
394 Specifying attributes of variables.<br>
395 <b>Supported:</b> <tt>cleanup</tt>, <tt>common</tt>, <tt>nocommon</tt>,
396 <tt>deprecated</tt>, <tt>transparent_union</tt>,
397 <tt>unused</tt>, <tt>weak</tt><br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]398
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]399 <b>Unsupported:</b> <tt>aligned</tt>, <tt>mode</tt>, <tt>packed</tt>,
400 <tt>section</tt>, <tt>shared</tt>, <tt>tls_model</tt>,
401 <tt>vector_size</tt>, <tt>dllimport</tt>,
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]402 <tt>dllexport</tt>, all target specific attributes.</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]403
Misha Brukman8395d732003-12-12 04:37:31 +0000[diff] [blame]404 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Type-Attributes.html#Type%20Attributes">Type Attributes</a>: Specifying attributes of types.<br>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]405 <b>Supported:</b> <tt>transparent_union</tt>, <tt>unused</tt>,
Misha Brukman8395d732003-12-12 04:37:31 +0000[diff] [blame]406 <tt>deprecated</tt>, <tt>may_alias</tt><br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]407
408 <b>Unsupported:</b> <tt>aligned</tt>, <tt>packed</tt>,
409 all target specific attributes.</li>
410
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]411 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html#Other%20Builtins">Other Builtins</a>:
412 Other built-in functions.<br>
413 We support all builtins which have a C language equivalent (e.g.,
414 <tt>__builtin_cos</tt>), <tt>__builtin_alloca</tt>,
415 <tt>__builtin_types_compatible_p</tt>, <tt>__builtin_choose_expr</tt>,
Chris Lattnerb7c4bac2004-06-18 06:26:29 +0000[diff] [blame]416 <tt>__builtin_constant_p</tt>, and <tt>__builtin_expect</tt>
417 (currently ignored). We also support builtins for ISO C99 floating
418 point comparison macros (e.g., <tt>__builtin_islessequal</tt>).</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]419 </ol>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]420
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]421 <p>The following extensions <b>are</b> known to be supported:</p>
422
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]423 <ol>
Chris Lattnerd3dc8502004-03-16 08:54:07 +0000[diff] [blame]424 <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 Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]425 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html#Statement%20Exprs">Statement Exprs</a>: Putting statements and declarations inside expressions.</li>
426 <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 Lattnerce33a1b2004-06-22 03:48:17 +0000[diff] [blame]427 <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 Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]428 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Conditionals.html#Conditionals">Conditionals</a>: Omitting the middle operand of a <code>?:</code> expression.</li>
429 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Long-Long.html#Long%20Long">Long Long</a>: Double-word integers.</li>
430 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Complex.html#Complex">Complex</a>: Data types for complex numbers.</li>
431 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Hex-Floats.html#Hex%20Floats">Hex Floats</a>:Hexadecimal floating-point constants.</li>
432 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html#Zero%20Length">Zero Length</a>: Zero-length arrays.</li>
433 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Empty-Structures.html#Empty%20Structures">Empty Structures</a>: Structures with no members.</li>
434 <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>
435 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Escaped-Newlines.html#Escaped%20Newlines">Escaped Newlines</a>: Slightly looser rules for escaped newlines.</li>
436 <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 Brukman8395d732003-12-12 04:37:31 +0000[diff] [blame]437 <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 Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]438 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Initializers.html#Initializers">Initializers</a>: Non-constant initializers.</li>
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]439 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Compound-Literals.html#Compound%20Literals">Compound Literals</a>: Compound literals give structures, unions,
440or arrays as values.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]441 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Designated-Inits.html#Designated%20Inits">Designated Inits</a>: Labeling elements of initializers.</li>
Misha Brukman8395d732003-12-12 04:37:31 +0000[diff] [blame]442 <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 Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]443 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Case-Ranges.html#Case%20Ranges">Case Ranges</a>: `case 1 ... 9' and such.</li>
444 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Mixed-Declarations.html#Mixed%20Declarations">Mixed Declarations</a>: Mixing declarations and code.</li>
445 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Function-Prototypes.html#Function%20Prototypes">Function Prototypes</a>: Prototype declarations and old-style definitions.</li>
446 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/C---Comments.html#C++%20Comments">C++ Comments</a>: C++ comments are recognized.</li>
447 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Dollar-Signs.html#Dollar%20Signs">Dollar Signs</a>: Dollar sign is allowed in identifiers.</li>
448 <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>
449 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Alignment.html#Alignment">Alignment</a>: Inquiring about the alignment of a type or variable.</li>
450 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Inline.html#Inline">Inline</a>: Defining inline functions (as fast as macros).</li>
451 <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>
452 <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>
453 <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 Lattner3646dad2004-02-14 04:08:29 +0000[diff] [blame]454 <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 Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]455 <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>
456 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Attribute-Syntax.html#Attribute%20Syntax">Attribute Syntax</a>: Formal syntax for attributes.</li>
Misha Brukman7cb4e382003-11-22 01:00:11 +0000[diff] [blame]457 </ol></li>
458
459</ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]460
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]461<p>If you run into GCC extensions which have not been included in any of these
462lists, please let us know (also including whether or not they work).</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]463
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]464</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]465
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]466<!-- ======================================================================= -->
467<div class="doc_subsection">
468 <a name="c++-fe">Known problems with the C++ front-end</a>
469</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]470
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]471<div class="doc_text">
472
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]473<p>For this release, the C++ front-end is considered to be fully functional but
Chris Lattnere76e9ab2003-12-12 04:25:33 +0000[diff] [blame]474has not been tested as thoroughly as the C front-end. It has been tested and
475works for a number of non-trivial programs, but there may be lurking bugs.
476Please report any bugs or problems.</p>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]477
478</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]479
480<!-- _______________________________________________________________________ -->
Chris Lattner141ebb62004-02-14 04:12:41 +0000[diff] [blame]481<div class="doc_subsubsection">Bugs</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]482
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]483<div class="doc_text">
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]484
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]485<ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]486<li>The C++ front-end inherits all problems afflicting the <a href="#c-fe">C
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]487 front-end</a>.</li>
Chris Lattner041e6c92004-07-17 02:04:41 +0000[diff] [blame]488
Chris Lattner5cd40922004-08-02 20:28:44 +0000[diff] [blame]489<li><b>IA-64 specific</b>: The C++ front-end does not use <a
490href="http://llvm.cs.uiuc.edu/PR406">IA64 ABI compliant layout of v-tables</a>.
Chris Lattner041e6c92004-07-17 02:04:41 +0000[diff] [blame]491In particular, it just stores function pointers instead of function
492descriptors in the vtable. This bug prevents mixing C++ code compiled with
Chris Lattner2fd93492004-08-02 20:29:51 +0000[diff] [blame]493LLVM with C++ objects compiled by other C++ compilers.</li>
Chris Lattner041e6c92004-07-17 02:04:41 +0000[diff] [blame]494
Chris Lattner5cd40922004-08-02 20:28:44 +0000[diff] [blame]495</ul>
496
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]497</div>
498
499<!-- _______________________________________________________________________ -->
500<div class="doc_subsubsection">
501 Notes
502</div>
503
504<div class="doc_text">
505
506<ul>
Chris Lattnerd2a74272003-10-27 18:30:37 +0000[diff] [blame]507
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]508<li>The C++ front-end is based on a pre-release of the GCC 3.4 C++ parser. This
509parser is significantly more standards compliant (and picky) than prior GCC
510versions. For more information, see the C++ section of the <a
Chris Lattnere76e9ab2003-12-12 04:25:33 +0000[diff] [blame]511href="http://gcc.gnu.org/gcc-3.4/changes.html">GCC 3.4 release notes</a>.</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]512
513<li>Destructors for local objects are not always run when a <tt>longjmp</tt> is
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]514 performed. In particular, destructors for objects in the <tt>longjmp</tt>ing
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]515 function and in the <tt>setjmp</tt> receiver function may not be run.
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]516 Objects in intervening stack frames will be destroyed, however (which is
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]517 better than most compilers).</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]518
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]519<li>The LLVM C++ front-end follows the <a
520 href="http://www.codesourcery.com/cxx-abi">Itanium C++ ABI</a>.
521 This document, which is not Itanium specific, specifies a standard for name
522 mangling, class layout, v-table layout, RTTI formats, and other C++
523 representation issues. Because we use this API, code generated by the LLVM
524 compilers should be binary compatible with machine code generated by other
525 Itanium ABI C++ compilers (such as G++, the Intel and HP compilers, etc).
526 <i>However</i>, the exception handling mechanism used by LLVM is very
527 different from the model used in the Itanium ABI, so <b>exceptions will not
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]528 interact correctly</b>. </li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]529
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]530</ul>
Chris Lattner46ecf612003-10-07 22:14:37 +0000[diff] [blame]531
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]532</div>
533
534<!-- ======================================================================= -->
535<div class="doc_subsection">
536 <a name="x86-be">Known problems with the X86 back-end</a>
537</div>
538
539<div class="doc_text">
540
541<ul>
Chris Lattner5cd40922004-08-02 20:28:44 +0000[diff] [blame]542 <li>none yet</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]543</ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]544
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]545</div>
546
547<!-- ======================================================================= -->
548<div class="doc_subsection">
Misha Brukmana516e992004-07-12 16:55:41 +0000[diff] [blame]549 <a name="sparcv9-be">Known problems with the SparcV9 back-end</a>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]550</div>
551
552<div class="doc_text">
553
554<ul>
Misha Brukmana516e992004-07-12 16:55:41 +0000[diff] [blame]555<li><a href="http://llvm.cs.uiuc.edu/PR60">[sparcv9] SparcV9 backend miscompiles
556several programs in the LLVM test suite</a></li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]557</ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]558
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]559</div>
560
561<!-- ======================================================================= -->
562<div class="doc_subsection">
563 <a name="c-be">Known problems with the C back-end</a>
564</div>
565
566<div class="doc_text">
567
568<ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]569
570<li>The C back-end produces code that violates the ANSI C Type-Based Alias
571Analysis rules. As such, special options may be necessary to compile the code
572(for example, GCC requires the <tt>-fno-strict-aliasing</tt> option). This
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]573problem probably cannot be fixed.</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]574
Chris Lattnera623e482003-10-20 19:05:03 +0000[diff] [blame]575<li><a href="http://llvm.cs.uiuc.edu/PR33">Initializers for global variables</a>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]576cannot include special floating point numbers like Not-A-Number or
577Infinity.</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]578
Chris Lattnerc679fbb2003-11-04 20:06:53 +0000[diff] [blame]579<li><a href="http://llvm.cs.uiuc.edu/PR56">Zero arg vararg functions are not
Chris Lattnerb28c3282003-10-24 04:03:19 +0000[diff] [blame]580supported</a>. This should not affect LLVM produced by the C or C++
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]581frontends.</li>
Chris Lattnerb28c3282003-10-24 04:03:19 +0000[diff] [blame]582
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]583</ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]584
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]585</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]586
587<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]588<div class="doc_section">
589 <a name="additionalinfo">Additional Information</a>
590</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]591<!-- *********************************************************************** -->
592
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]593<div class="doc_text">
594
595<p>A wide variety of additional information is available on the LLVM web page,
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]596including mailing lists and publications describing algorithms and components
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]597implemented in LLVM. The web page also contains versions of the API
598documentation which is up-to-date with the CVS version of the source code. You
599can access versions of these documents specific to this release by going into
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]600the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]601
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]602<p>If you have any questions or comments about LLVM, please feel free to contact
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]603us via the <a href="http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev">mailing
604lists</a>.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]605
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]606</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]607
608<!-- *********************************************************************** -->
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]609
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]610<hr>
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]611<address>
Misha Brukman8834af92003-12-21 22:53:21 +0000[diff] [blame]612 <a href="http://jigsaw.w3.org/css-validator/check/referer"><img
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614 <a href="http://validator.w3.org/check/referer"><img
615 src="http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01!" /></a>
616
Misha Brukman7cb4e382003-11-22 01:00:11 +0000[diff] [blame]617 <a href="http://llvm.cs.uiuc.edu">The LLVM Compiler Infrastructure</a><br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]618 Last modified: $Date$
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]619</address>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]620
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]621</body>
622</html>