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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>
Chris Lattner163c3262004-08-16 00:20:18 +0000[diff] [blame]143<li></li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]144</ol>
Reid Spencer3e58f582004-05-23 17:23:13 +0000[diff] [blame]145</div>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]146
147<!--=========================================================================-->
148<div class="doc_subsubsection">
Misha Brukman017f2f32004-04-19 02:56:49 +0000[diff] [blame]149<a name="bugfix">In this release, the following bugs in the previous release
150were fixed:</a>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]151</div>
152
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]153<div class="doc_text">
154
Chris Lattner5cd40922004-08-02 20:28:44 +0000[diff] [blame]155<p>Bugs fixed in the LLVM Core:</p>
Chris Lattnere7525b52003-10-07 21:38:31 +0000[diff] [blame]156
157<ol>
Reid Spencerf03b47c2004-08-16 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 Lattnera10ed3b2004-08-16 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 Spencer7d0a1232004-08-27 00:48:26 +0000[diff] [blame^]162<li><a href="http://llvm.org/PR430">[bcwriter] Empty compaction tables
163 defined</a></li>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]164</ol>
165
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]166<p>Bugs in the C/C++ front-end:</p>
167
168<ol>
Chris Lattner163c3262004-08-16 00:20:18 +0000[diff] [blame]169<li></li>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]170</ol>
Brian Gaeke730d8d62004-08-24 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 Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]179</div>
Reid Spencer3e58f582004-05-23 17:23:13 +0000[diff] [blame]180
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]181<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]182<div class="doc_section">
183 <a name="portability">Portability and Supported Platforms</a>
184</div>
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]185<!-- *********************************************************************** -->
186
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]187<div class="doc_text">
188
Chris Lattner2c7b0872004-06-01 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 Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]195<li>Intel and AMD machines running on Win32 with the Cygwin libraries.</li>
Chris Lattnerd21e3d02004-08-05 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 Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]199</ul>
200
Brian Gaekee3e557e2004-05-09 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 Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]206
Chris Lattner2c7b0872004-06-01 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 Lattnerce1a3842004-06-01 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 Lattnera752fce2004-08-16 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 Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]215
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]216</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]217
218<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]219<div class="doc_section">
220 <a name="knownproblems">Known Problems</a>
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_text">
225
226<p>This section contains all known problems with the LLVM system, listed by
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]227component. As new problems are discovered, they will be added to these
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]228sections. If you run into a problem, please check the <a
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]229href="http://llvm.cs.uiuc.edu/bugs/">LLVM bug database</a> and submit a bug if
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]230there isn't already one.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]231
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]232</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]233
Chris Lattnerb911de42004-03-14 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 Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]238
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]239<div class="doc_text">
240
Misha Brukmanfa50a222004-05-12 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 Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]246
247<ul>
Misha Brukman467ea6b2004-08-05 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 Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]251<li>The following passes are incomplete or buggy: <tt>-pgmdep, -memdep,
Chris Lattner99583502004-06-28 00:44:45 +0000[diff] [blame]252 -ipmodref, -cee</tt></li>
Chris Lattnerb911de42004-03-14 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 Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]260
Misha Brukman80731b92003-11-22 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 Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]265
Misha Brukman80731b92003-11-22 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 Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]272
273<li>The JIT does not use mutexes to protect its internal data structures. As
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]274such, execution of a threaded program could cause these data structures to be
275corrupted.</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]276
Chris Lattnerc0171082004-08-08 03:33:07 +0000[diff] [blame]277<li>Linking in static archive files (.a files) is slow (there is no symbol
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]278table in the archive).</li>
Chris Lattnerc679fbb2003-11-04 20:06:53 +0000[diff] [blame]279
Misha Brukman017f2f32004-04-19 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 Lattneraebc66a2004-02-15 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 Criswell5d6345a2004-03-12 21:29:42 +0000[diff] [blame]284values live across a setjmp as volatile</a>. This missing feature only affects
Chris Lattneraebc66a2004-02-15 23:09:07 +0000[diff] [blame]285targets whose setjmp/longjmp libraries do not save and restore the entire
286register file.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]287</ul>
Misha Brukman80731b92003-11-22 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 Lattner178f3db2003-10-02 05:07:23 +0000[diff] [blame]294
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]295<!-- _______________________________________________________________________ -->
Chris Lattner5a8a7282003-12-14 05:03:43 +0000[diff] [blame]296<div class="doc_subsubsection">Bugs</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]297
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]298<div class="doc_text">
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]299<ul>
Chris Lattner3d482502003-10-02 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 Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]307</pre></li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]308
Misha Brukmanfa50a222004-05-12 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 Lattner1ab58dd2004-03-16 21:39:04 +0000[diff] [blame]312
Misha Brukman017f2f32004-04-19 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 Lattner1ab58dd2004-03-16 21:39:04 +0000[diff] [blame]315
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]316</ul>
Misha Brukman80731b92003-11-22 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 Lattnerd2a74272003-10-27 18:30:37 +0000[diff] [blame]329
330<li>"long double" is transformed by the front-end into "double". There is no
Misha Brukman80731b92003-11-22 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 Brukman7cb4e382003-11-22 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 Lattner3d482502003-10-02 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 Brukman80731b92003-11-22 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 Brukman80731b92003-11-22 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 Criswell86a3a482003-12-18 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 Brukman80731b92003-11-22 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 Brukman80731b92003-11-22 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 Brukman7cb4e382003-11-22 01:00:11 +0000[diff] [blame]358 </ol>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]359
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]360 <p>The following GCC extensions are <b>partially</b> supported. An ignored
Chris Lattner3d482502003-10-02 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 Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]363 ignored by the LLVM compiler and will cause a different interpretation of
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]364 the program.</p>
Chris Lattner3d482502003-10-02 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 Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]369 Supported, but allocated stack space is not freed until the function returns (noted above).</li>
Chris Lattner3d482502003-10-02 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 Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]372
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]373 Declaring that functions have no side effects or that they can never
Misha Brukman80731b92003-11-22 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 Lattner3d482502003-10-02 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 Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]393
Chris Lattner3d482502003-10-02 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 Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]397 <tt>dllexport</tt>, all target specific attributes.</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]398
Misha Brukman8395d732003-12-12 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 Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]400 <b>Supported:</b> <tt>transparent_union</tt>, <tt>unused</tt>,
Misha Brukman8395d732003-12-12 04:37:31 +0000[diff] [blame]401 <tt>deprecated</tt>, <tt>may_alias</tt><br>
Misha Brukman80731b92003-11-22 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 Lattner3d482502003-10-02 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 Lattnerb7c4bac2004-06-18 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 Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]414 </ol>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]415
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]416 <p>The following extensions <b>are</b> known to be supported:</p>
417
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]418 <ol>
Chris Lattnerd3dc8502004-03-16 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 Brukman80731b92003-11-22 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 Lattnerce33a1b2004-06-22 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 Brukman80731b92003-11-22 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 Brukman8395d732003-12-12 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 Brukman80731b92003-11-22 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 Criswell86a3a482003-12-18 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 Brukman80731b92003-11-22 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 Brukman8395d732003-12-12 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 Brukman80731b92003-11-22 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 Lattner3646dad2004-02-14 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 Brukman80731b92003-11-22 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 Brukman7cb4e382003-11-22 01:00:11 +0000[diff] [blame]452 </ol></li>
453
454</ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]455
Misha Brukman80731b92003-11-22 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 Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]458
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]459</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]460
Misha Brukman80731b92003-11-22 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 Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]465
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]466<div class="doc_text">
467
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]468<p>For this release, the C++ front-end is considered to be fully functional but
Chris Lattnere76e9ab2003-12-12 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 Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]472
473</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]474
475<!-- _______________________________________________________________________ -->
Chris Lattner141ebb62004-02-14 04:12:41 +0000[diff] [blame]476<div class="doc_subsubsection">Bugs</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]477
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]478<div class="doc_text">
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]479
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]480<ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]481<li>The C++ front-end inherits all problems afflicting the <a href="#c-fe">C
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]482 front-end</a>.</li>
Chris Lattner041e6c92004-07-17 02:04:41 +0000[diff] [blame]483
Chris Lattner5cd40922004-08-02 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 Lattner041e6c92004-07-17 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 Lattner2fd93492004-08-02 20:29:51 +0000[diff] [blame]488LLVM with C++ objects compiled by other C++ compilers.</li>
Chris Lattner041e6c92004-07-17 02:04:41 +0000[diff] [blame]489
Chris Lattner5cd40922004-08-02 20:28:44 +0000[diff] [blame]490</ul>
491
Misha Brukman80731b92003-11-22 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 Lattnerd2a74272003-10-27 18:30:37 +0000[diff] [blame]502
Chris Lattner3d482502003-10-02 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 Lattnere76e9ab2003-12-12 04:25:33 +0000[diff] [blame]506href="http://gcc.gnu.org/gcc-3.4/changes.html">GCC 3.4 release notes</a>.</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]507
508<li>Destructors for local objects are not always run when a <tt>longjmp</tt> is
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]509 performed. In particular, destructors for objects in the <tt>longjmp</tt>ing
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]510 function and in the <tt>setjmp</tt> receiver function may not be run.
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]511 Objects in intervening stack frames will be destroyed, however (which is
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]512 better than most compilers).</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]513
Chris Lattner62495762003-10-02 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 Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]523 interact correctly</b>. </li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]524
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]525</ul>
Chris Lattner46ecf612003-10-07 22:14:37 +0000[diff] [blame]526
Misha Brukman80731b92003-11-22 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 Lattner5cd40922004-08-02 20:28:44 +0000[diff] [blame]537 <li>none yet</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]538</ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]539
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]540</div>
541
542<!-- ======================================================================= -->
543<div class="doc_subsection">
Misha Brukmana516e992004-07-12 16:55:41 +0000[diff] [blame]544 <a name="sparcv9-be">Known problems with the SparcV9 back-end</a>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]545</div>
546
547<div class="doc_text">
548
549<ul>
Misha Brukmana516e992004-07-12 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 Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]552</ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]553
Misha Brukman80731b92003-11-22 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 Lattner3d482502003-10-02 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 Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]568problem probably cannot be fixed.</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]569
Chris Lattnera623e482003-10-20 19:05:03 +0000[diff] [blame]570<li><a href="http://llvm.cs.uiuc.edu/PR33">Initializers for global variables</a>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]571cannot include special floating point numbers like Not-A-Number or
572Infinity.</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]573
Chris Lattnerc679fbb2003-11-04 20:06:53 +0000[diff] [blame]574<li><a href="http://llvm.cs.uiuc.edu/PR56">Zero arg vararg functions are not
Chris Lattnerb28c3282003-10-24 04:03:19 +0000[diff] [blame]575supported</a>. This should not affect LLVM produced by the C or C++
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]576frontends.</li>
Chris Lattnerb28c3282003-10-24 04:03:19 +0000[diff] [blame]577
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]578</ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]579
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]580</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]581
582<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]583<div class="doc_section">
584 <a name="additionalinfo">Additional Information</a>
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_text">
589
590<p>A wide variety of additional information is available on the LLVM web page,
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]591including mailing lists and publications describing algorithms and components
Chris Lattner3d482502003-10-02 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 Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]595the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]596
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]597<p>If you have any questions or comments about LLVM, please feel free to contact
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]598us via the <a href="http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev">mailing
599lists</a>.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]600
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]601</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]602
603<!-- *********************************************************************** -->
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]604
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]605<hr>
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]606<address>
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611
Misha Brukman7cb4e382003-11-22 01:00:11 +0000[diff] [blame]612 <a href="http://llvm.cs.uiuc.edu">The LLVM Compiler Infrastructure</a><br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]613 Last modified: $Date$
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