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Chris Lattner5c3389a2004-08-16 00:20:18 +0000[diff] [blame]6 <title>LLVM 1.4 Release Notes</title>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]7</head>
8<body>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]9
Chris Lattner5c3389a2004-08-16 00:20:18 +0000[diff] [blame]10<div class="doc_title">LLVM 1.4 Release Notes</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]11
12<ol>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]13 <li><a href="#intro">Introduction</a></li>
14 <li><a href="#whatsnew">What's New?</a></li>
Chris Lattner4b538b92004-04-30 22:17:12 +0000[diff] [blame]15 <li><a href="GettingStarted.html">Installation Instructions</a></li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]16 <li><a href="#portability">Portability and Supported Platforms</a></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]17 <li><a href="#knownproblems">Known Problems</a>
18 <ul>
Chris Lattner2974b5b2004-04-01 00:41:31 +0000[diff] [blame]19 <li><a href="#experimental">Experimental features included in this
20 release</a>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]21 <li><a href="#core">Known problems with the LLVM Core</a>
22 <li><a href="#c-fe">Known problems with the C Front-end</a>
23 <li><a href="#c++-fe">Known problems with the C++ Front-end</a>
24 <li><a href="#x86-be">Known problems with the X86 Back-end</a>
Misha Brukmanadb1c392004-07-12 16:55:41 +0000[diff] [blame]25 <li><a href="#sparcv9-be">Known problems with the SparcV9 Back-end</a>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]26 <li><a href="#c-be">Known problems with the C back-end</a>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]27 </ul></li>
28 <li><a href="#additionalinfo">Additional Information</a></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]29</ol>
30
Chris Lattner7911ce22004-05-23 21:07:27 +0000[diff] [blame]31<div class="doc_author">
32 <p>Written by the <a href="http://llvm.cs.uiuc.edu">LLVM team</a><p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]33</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]34
35<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]36<div class="doc_section">
37 <a name="intro">Introduction</a>
38</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]39<!-- *********************************************************************** -->
40
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]41<div class="doc_text">
42
43<p>This document contains the release notes for the LLVM compiler
Chris Lattner5c3389a2004-08-16 00:20:18 +0000[diff] [blame]44infrastructure, release 1.4. Here we describe the status of LLVM, including any
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]45known problems and bug fixes from the previous release. The most up-to-date
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]46version of this document can be found on the <a
Chris Lattner5c3389a2004-08-16 00:20:18 +0000[diff] [blame]47href="http://llvm.cs.uiuc.edu/releases/1.4/">LLVM 1.4 web site</a>. If you are
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]48not reading this on the LLVM web pages, you should probably go there because
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]49this document may be updated after the release.</p>
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]50
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]51<p>For more information about LLVM, including information about potentially more
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]52current releases, please check out the <a href="http://llvm.cs.uiuc.edu">main
53web site</a>. If you have questions or comments, the <a
54href="http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVM developer's mailing
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]55list</a> is a good place to send them.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]56
Chris Lattner9e848092003-12-12 04:25:33 +0000[diff] [blame]57<p>Note that if you are reading this file from CVS, this document applies
58to the <i>next</i> release, not the current one. To see the release notes for
59the current or previous releases, see the <a
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]60href="http://llvm.cs.uiuc.edu/releases/">releases page</a>.</p>
61
62</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]63
64<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]65<div class="doc_section">
66 <a name="whatsnew">What's New?</a>
67</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]68<!-- *********************************************************************** -->
69
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]70<div class="doc_text">
71
Chris Lattner5c3389a2004-08-16 00:20:18 +0000[diff] [blame]72<p>This is the fifth public release of the LLVM compiler infrastructure.</p>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]73
Misha Brukman6df9e2c2004-05-12 21:46:05 +0000[diff] [blame]74<p> At this time, LLVM is known to correctly compile and run all C &amp; C++
Chris Lattnerd5713882004-08-02 20:28:44 +0000[diff] [blame]75SPEC CPU95 &amp; 2000 benchmarks, the Olden benchmarks, and the Ptrdist
Chris Lattner9b3b04f2004-10-16 18:35:57 +0000[diff] [blame]76benchmarks, and <b>many</b> other C and C++ programs.</p>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]77
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]78</div>
79
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]80<!--=========================================================================-->
81<div class="doc_subsubsection">
Chris Lattnera39719f2004-02-25 16:36:51 +0000[diff] [blame]82<a name="newfeatures">This release implements the following new features:</a>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]83</div>
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]84
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]85<div class="doc_text">
86
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]87<ol>
Chris Lattner9b3b04f2004-10-16 18:35:57 +0000[diff] [blame]88 <li>The test/Programs hierarchy<a href="http://llvm.cs.uiuc.edu/PR257">has
89 been moved out of the main LLVM tree</a> into a separate CVS repo and
90 tarball.</li>
91 <li>LLVM now optimizes global variables significantly more than it did
92 before.</li>
93 <li>LLVM now includes the new '<tt>undef</tt>' value and <a
94 href="LangRef.html#i_unreachable"><tt>unreachable</tt></a> instruction,
95 which give the optimizer more information about the behavior of the
96 program.</li>
Chris Lattner55ee0312003-11-19 22:05:38 +0000[diff] [blame]97</ol>
Chris Lattner0ef19062003-11-08 04:28:55 +0000[diff] [blame]98
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]99</div>
100
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]101
102<!--=========================================================================-->
103<div class="doc_subsubsection">
104In this release, the following missing features were implemented:
105</div>
Chris Lattner0ef19062003-11-08 04:28:55 +0000[diff] [blame]106
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]107<div class="doc_text">
108
Chris Lattner0ef19062003-11-08 04:28:55 +0000[diff] [blame]109<ol>
Chris Lattner9cfa0d92004-10-09 19:19:57 +0000[diff] [blame]110<li><a href="http://llvm.cs.uiuc.edu/PR419">JIT interface should support arbitrary
Chris Lattner5c3389a2004-08-16 00:20:18 +0000[diff] [blame]111 calls</a></li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]112</ol>
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]113
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]114</div>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]115
116<!--=========================================================================-->
117<div class="doc_subsubsection">
Misha Brukmana7aadf12004-04-19 02:56:49 +0000[diff] [blame]118<a name="qualityofimp">In this release, the following Quality of Implementation
119issues were fixed:</a>
Chris Lattnere29ac162003-12-20 03:42:11 +0000[diff] [blame]120</div>
121
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]122<div class="doc_text">
123
Chris Lattnere29ac162003-12-20 03:42:11 +0000[diff] [blame]124<ol>
Chris Lattner9cfa0d92004-10-09 19:19:57 +0000[diff] [blame]125<li><a href="http://llvm.cs.uiuc.edu/PR426">[llvmg++] Tons of warnings are spewed when
Chris Lattner980c50f2004-08-20 00:36:23 +0000[diff] [blame]126 linking to libstdc++</a></li>
Chris Lattner9cfa0d92004-10-09 19:19:57 +0000[diff] [blame]127<li><a href="http://llvm.cs.uiuc.edu/PR352">include/{Support,Config} ->
Chris Lattner57d43e12004-09-19 19:21:26 +0000[diff] [blame]128 include/llvm/{Support,Config}</a></li>
Chris Lattnere29ac162003-12-20 03:42:11 +0000[diff] [blame]129</ol>
130
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]131</div>
132
Chris Lattnere29ac162003-12-20 03:42:11 +0000[diff] [blame]133<!--=========================================================================-->
134<div class="doc_subsubsection">
Chris Lattnera39719f2004-02-25 16:36:51 +0000[diff] [blame]135In this release, the following build problems were fixed:
Brian Gaeke6b31beb2004-01-16 21:55:04 +0000[diff] [blame]136</div>
137
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]138<div class="doc_text">
Brian Gaeke6b31beb2004-01-16 21:55:04 +0000[diff] [blame]139<ol>
Chris Lattner5c3389a2004-08-16 00:20:18 +0000[diff] [blame]140<li></li>
Brian Gaeke6b31beb2004-01-16 21:55:04 +0000[diff] [blame]141</ol>
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]142</div>
Brian Gaeke6b31beb2004-01-16 21:55:04 +0000[diff] [blame]143
144<!--=========================================================================-->
145<div class="doc_subsubsection">
Chris Lattner6e1ef192004-05-02 04:19:15 +0000[diff] [blame]146<a name="codequality">This release includes the following Code Quality
147improvements:</a>
Chris Lattneraab56d42004-05-23 20:42:08 +0000[diff] [blame]148</div>
Chris Lattner89ca2b82003-10-27 17:06:39 +0000[diff] [blame]149
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]150<div class="doc_text">
Chris Lattner89ca2b82003-10-27 17:06:39 +0000[diff] [blame]151<ol>
Chris Lattnerffd9cef2004-10-09 19:37:02 +0000[diff] [blame]152<li><a href="http://llvm.cs.uiuc.edu/PR362">Ugly code generated for
Chris Lattner57d43e12004-09-19 19:21:26 +0000[diff] [blame]153 std::min/std::max</a></li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]154</ol>
Reid Spencer8e0262f2004-05-23 17:23:13 +0000[diff] [blame]155</div>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]156
157<!--=========================================================================-->
158<div class="doc_subsubsection">
Misha Brukmana7aadf12004-04-19 02:56:49 +0000[diff] [blame]159<a name="bugfix">In this release, the following bugs in the previous release
160were fixed:</a>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]161</div>
162
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]163<div class="doc_text">
164
Chris Lattnerd5713882004-08-02 20:28:44 +0000[diff] [blame]165<p>Bugs fixed in the LLVM Core:</p>
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]166
167<ol>
Chris Lattner9cfa0d92004-10-09 19:19:57 +0000[diff] [blame]168<li><a href="http://llvm.cs.uiuc.edu/PR420">[licm] LICM invalidates alias analysis info
Chris Lattner372dc8d2004-09-15 01:09:25 +0000[diff] [blame]169 and uses broken information</a> (optimizer crash)</li>
Chris Lattner9cfa0d92004-10-09 19:19:57 +0000[diff] [blame]170<li><a href="http://llvm.cs.uiuc.edu/PR422">[asmwriter] Asmwriter is really slow for
Chris Lattner372dc8d2004-09-15 01:09:25 +0000[diff] [blame]171 functions with lots of values</a></li>
Chris Lattner9cfa0d92004-10-09 19:19:57 +0000[diff] [blame]172<li><a href="http://llvm.cs.uiuc.edu/PR423">[anders-aa] Andersen's AA is completely
Chris Lattner446562f2004-08-16 05:46:57 +0000[diff] [blame]173 broken in LLVM 1.3</a></li>
Chris Lattner9cfa0d92004-10-09 19:19:57 +0000[diff] [blame]174<li><a href="http://llvm.cs.uiuc.edu/PR430">[bcwriter] Empty compaction tables
Reid Spencerb810d5f2004-08-27 00:48:26 +0000[diff] [blame]175 defined</a></li>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]176</ol>
177
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]178<p>Bugs in the C/C++ front-end:</p>
179
180<ol>
Chris Lattner9cfa0d92004-10-09 19:19:57 +0000[diff] [blame]181<li><a href="http://llvm.cs.uiuc.edu/PR445">[llvmg++] not enough templates are instantiated</a></li>
182<li><a href="http://llvm.cs.uiuc.edu/PR450">[llvmg++] Extern const globals cannot be
Chris Lattnere4421b42004-10-05 00:23:02 +0000[diff] [blame]183marked 'constant' if they have nontrivial ctors or dtors</a></li>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]184</ol>
Brian Gaekee77c8e72004-08-24 07:43:48 +0000[diff] [blame]185
186<p>Bugs fixed in the Sparc V9 back-end:</p>
187
188<ol>
Chris Lattner9cfa0d92004-10-09 19:19:57 +0000[diff] [blame]189<li><a href="http://llvm.cs.uiuc.edu/PR428">[sparcv9] regalloc assertion
Brian Gaekee77c8e72004-08-24 07:43:48 +0000[diff] [blame]190 failure with certain indirect calls</a></li>
191</ol>
192
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]193</div>
Reid Spencer8e0262f2004-05-23 17:23:13 +0000[diff] [blame]194
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]195<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]196<div class="doc_section">
197 <a name="portability">Portability and Supported Platforms</a>
198</div>
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]199<!-- *********************************************************************** -->
200
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]201<div class="doc_text">
202
Chris Lattner4654bdb2004-06-01 18:22:41 +0000[diff] [blame]203<p>LLVM is known to work in the following platforms:</p>
204
205<ul>
206<li>Intel and AMD machines running Red Hat Linux and FreeBSD (and probably
207 other unix-like systems).</li>
208<li>Sun UltraSPARC workstations running Solaris 8.</li>
Chris Lattner4654bdb2004-06-01 18:22:41 +0000[diff] [blame]209<li>Intel and AMD machines running on Win32 with the Cygwin libraries.</li>
Chris Lattnere58d3562004-08-05 21:53:13 +0000[diff] [blame]210<li>PowerPC-based Mac OS X boxes, running 10.2 and above. Note that no JIT
211support is available yet, and LLC support is beta. The C backend can be used
212to produce stable code for this platform.</li>
Chris Lattner4654bdb2004-06-01 18:22:41 +0000[diff] [blame]213</ul>
214
Brian Gaekeb0fd7612004-05-09 05:28:35 +0000[diff] [blame]215<p>The core LLVM infrastructure uses
216<a href="http://www.gnu.org/software/autoconf/">GNU autoconf</a> to adapt itself
217to the machine and operating system on which it is built. However, minor
218porting may be required to get LLVM to work on new platforms. We welcome your
219portability patches and reports of successful builds or error messages.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]220
Chris Lattner4654bdb2004-06-01 18:22:41 +0000[diff] [blame]221<p>Note that the LLVM build system does not currently support directories with
222spaces on them when running on Win32/cygwin. We strongly recommend running
223LLVM and the C frontend out of a top-level directory without spaces (e.g.,
Chris Lattner74032a52004-06-01 19:41:30 +0000[diff] [blame]224<tt>/cygdrive/c/llvm</tt>). Also, make sure to install <b>all</b> of the
225cygwin packages. By default, many important tools are not installed that
Chris Lattner5aff3552004-08-16 20:20:46 +0000[diff] [blame]226are needed by the LLVM build process or test suite (e.g., /bin/time). Finally,
227please make sure that there are no directories with spaces in them in your
228PATH environment variable.</p>
Chris Lattner4654bdb2004-06-01 18:22:41 +0000[diff] [blame]229
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]230</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]231
232<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]233<div class="doc_section">
234 <a name="knownproblems">Known Problems</a>
235</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]236<!-- *********************************************************************** -->
237
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]238<div class="doc_text">
239
240<p>This section contains all known problems with the LLVM system, listed by
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]241component. As new problems are discovered, they will be added to these
Chris Lattner5eccca42003-12-12 21:22:16 +0000[diff] [blame]242sections. If you run into a problem, please check the <a
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]243href="http://llvm.cs.uiuc.edu/bugs/">LLVM bug database</a> and submit a bug if
Chris Lattner5eccca42003-12-12 21:22:16 +0000[diff] [blame]244there isn't already one.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]245
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]246</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]247
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]248<!-- ======================================================================= -->
249<div class="doc_subsection">
250 <a name="experimental">Experimental features included with this release</a>
251</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]252
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]253<div class="doc_text">
254
Misha Brukman6df9e2c2004-05-12 21:46:05 +0000[diff] [blame]255<p>The following components of this LLVM release are either untested, known to
256be broken or unreliable, or are in early development. These components should
257not be relied on, and bugs should not be filed against them, but they may be
258useful to some people. In particular, if you would like to work on one of these
259components, please contact us on the llvmdev list.</p>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]260
261<ul>
Misha Brukman94118752004-08-05 21:04:03 +0000[diff] [blame]262<li>The PowerPC backend is incomplete and is known to miscompile several SPEC
263benchmarks. The file <tt>llvm/lib/Target/PowerPC/README.txt</tt> has
264details.</li>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]265<li>The following passes are incomplete or buggy: <tt>-pgmdep, -memdep,
Chris Lattner9934f972004-09-14 16:43:13 +0000[diff] [blame]266 -ipmodref, -cee, -branch-combine, -instloops, -paths</tt></li>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]267<li>The <tt>-pre</tt> pass is incomplete (there are cases it doesn't handle that
268 it should) and not thoroughly tested.</li>
269<li>The <tt>llvm-ar</tt> tool is incomplete and probably buggy.</li>
270<li>The <tt>llvm-db</tt> tool is in a very early stage of development.</li>
271</ul>
272
273</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]274
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]275<!-- ======================================================================= -->
276<div class="doc_subsection">
277 <a name="core">Known problems with the LLVM Core</a>
278</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]279
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]280<div class="doc_text">
281
282<ul>
283
284<li>In the JIT, <tt>dlsym</tt> on a symbol compiled by the JIT will not
285work.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]286
287<li>The JIT does not use mutexes to protect its internal data structures. As
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]288such, execution of a threaded program could cause these data structures to be
289corrupted.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]290
Chris Lattnereb673962004-08-08 03:33:07 +0000[diff] [blame]291<li>Linking in static archive files (.a files) is slow (there is no symbol
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]292table in the archive).</li>
Chris Lattner2855ecd2003-11-04 20:06:53 +0000[diff] [blame]293
Misha Brukmana7aadf12004-04-19 02:56:49 +0000[diff] [blame]294<li>The gccld program <a href="http://llvm.cs.uiuc.edu/PR139">does not link
295objects/archives in the order specified on the command line.</a></li>
Chris Lattner2e6fcaf2004-02-15 23:09:07 +0000[diff] [blame]296
297<li><a href="http://llvm.cs.uiuc.edu/PR240">The lower-invoke pass does not mark
John Criswelld46c6962004-03-12 21:29:42 +0000[diff] [blame]298values live across a setjmp as volatile</a>. This missing feature only affects
Chris Lattner2e6fcaf2004-02-15 23:09:07 +0000[diff] [blame]299targets whose setjmp/longjmp libraries do not save and restore the entire
300register file.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]301</ul>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]302</div>
303
304<!-- ======================================================================= -->
305<div class="doc_subsection">
306 <a name="c-fe">Known problems with the C front-end</a>
307</div>
Chris Lattner47588f92003-10-02 05:07:23 +0000[diff] [blame]308
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]309<!-- _______________________________________________________________________ -->
Chris Lattnerb40efb32003-12-14 05:03:43 +0000[diff] [blame]310<div class="doc_subsubsection">Bugs</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]311
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]312<div class="doc_text">
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]313<ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]314<li>C99 Variable sized arrays do not release stack memory when they go out of
315 scope. Thus, the following program may run out of stack space:
316<pre>
317 for (i = 0; i != 1000000; ++i) {
318 int X[n];
319 foo(X);
320 }
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]321</pre></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]322
Misha Brukman6df9e2c2004-05-12 21:46:05 +0000[diff] [blame]323<li>Initialization of global union variables can only be done <a
324href="http://llvm.cs.uiuc.edu/bugs/show_bug.cgi?id=162">with the largest union
325member</a>.</li>
Chris Lattnerf580cdc2004-03-16 21:39:04 +0000[diff] [blame]326
Misha Brukmana7aadf12004-04-19 02:56:49 +0000[diff] [blame]327<li><a href="http://llvm.cs.uiuc.edu/PR244">[llvm-gcc] Error when an implicitly
328external function is re-declared as static</a></li>
Chris Lattnerf580cdc2004-03-16 21:39:04 +0000[diff] [blame]329
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]330</ul>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]331</div>
332
333<!-- _______________________________________________________________________ -->
334<div class="doc_subsubsection">
335 Notes
336</div>
337
338<div class="doc_text">
339
340<ul>
341
342<li>Inline assembly is not yet supported.</li>
Chris Lattnere01fcfb2003-10-27 18:30:37 +0000[diff] [blame]343
344<li>"long double" is transformed by the front-end into "double". There is no
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]345support for floating point data types of any size other than 32 and 64
346bits.</li>
347
348<li>The following Unix system functionality has not been tested and may not
349work:
Misha Brukmane0c891c2003-11-22 01:00:11 +0000[diff] [blame]350 <ol>
351 <li><tt>sigsetjmp</tt>, <tt>siglongjmp</tt> - These are not turned into the
352 appropriate <tt>invoke</tt>/<tt>unwind</tt> instructions. Note that
353 <tt>setjmp</tt> and <tt>longjmp</tt> <em>are</em> compiled correctly.
354 <li><tt>getcontext</tt>, <tt>setcontext</tt>, <tt>makecontext</tt>
355 - These functions have not been tested.
356 </ol></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]357
358<li>Although many GCC extensions are supported, some are not. In particular,
359 the following extensions are known to <b>not be</b> supported:
360 <ol>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]361 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Local-Labels.html#Local%20Labels">Local Labels</a>: Labels local to a block.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]362 <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>
363 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Constructing-Calls.html#Constructing%20Calls">Constructing Calls</a>: Dispatching a call to another function.</li>
364 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Extended-Asm.html#Extended%20Asm">Extended Asm</a>: Assembler instructions with C expressions as operands.</li>
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]365 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Constraints.html#Constraints">Constraints</a>: Constraints for asm operands.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]366 <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>
367 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Explicit-Reg-Vars.html#Explicit%20Reg%20Vars">Explicit Reg Vars</a>: Defining variables residing in specified registers.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]368 <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>
369 <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>
370 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Thread-Local.html#Thread-Local">Thread-Local</a>: Per-thread variables.</li>
371 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Pragmas.html#Pragmas">Pragmas</a>: Pragmas accepted by GCC.</li>
Misha Brukmane0c891c2003-11-22 01:00:11 +0000[diff] [blame]372 </ol>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]373
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]374 <p>The following GCC extensions are <b>partially</b> supported. An ignored
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]375 attribute means that the LLVM compiler ignores the presence of the attribute,
376 but the code should still work. An unsupported attribute is one which is
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]377 ignored by the LLVM compiler and will cause a different interpretation of
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]378 the program.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]379
380 <ol>
381 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Length.html#Variable%20Length">Variable Length</a>:
382 Arrays whose length is computed at run time.<br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]383 Supported, but allocated stack space is not freed until the function returns (noted above).</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]384
385 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html#Function%20Attributes">Function Attributes</a>:
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]386
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]387 Declaring that functions have no side effects or that they can never
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]388 return.<br>
389
390 <b>Supported:</b> <tt>format</tt>, <tt>format_arg</tt>, <tt>non_null</tt>,
391 <tt>constructor</tt>, <tt>destructor</tt>, <tt>unused</tt>,
392 <tt>deprecated</tt>, <tt>warn_unused_result</tt>, <tt>weak</tt><br>
393
394 <b>Ignored:</b> <tt>noreturn</tt>, <tt>noinline</tt>,
395 <tt>always_inline</tt>, <tt>pure</tt>, <tt>const</tt>, <tt>nothrow</tt>,
396 <tt>malloc</tt>, <tt>no_instrument_function</tt>, <tt>cdecl</tt><br>
397
398 <b>Unsupported:</b> <tt>used</tt>, <tt>section</tt>, <tt>alias</tt>,
399 <tt>visibility</tt>, <tt>regparm</tt>, <tt>stdcall</tt>,
400 <tt>fastcall</tt>, all other target specific attributes</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]401
402 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Attributes.html#Variable%20Attributes">Variable Attributes</a>:
403 Specifying attributes of variables.<br>
404 <b>Supported:</b> <tt>cleanup</tt>, <tt>common</tt>, <tt>nocommon</tt>,
405 <tt>deprecated</tt>, <tt>transparent_union</tt>,
406 <tt>unused</tt>, <tt>weak</tt><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]407
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]408 <b>Unsupported:</b> <tt>aligned</tt>, <tt>mode</tt>, <tt>packed</tt>,
409 <tt>section</tt>, <tt>shared</tt>, <tt>tls_model</tt>,
410 <tt>vector_size</tt>, <tt>dllimport</tt>,
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]411 <tt>dllexport</tt>, all target specific attributes.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]412
Misha Brukmanc4b7bee2003-12-12 04:37:31 +0000[diff] [blame]413 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Type-Attributes.html#Type%20Attributes">Type Attributes</a>: Specifying attributes of types.<br>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]414 <b>Supported:</b> <tt>transparent_union</tt>, <tt>unused</tt>,
Misha Brukmanc4b7bee2003-12-12 04:37:31 +0000[diff] [blame]415 <tt>deprecated</tt>, <tt>may_alias</tt><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]416
417 <b>Unsupported:</b> <tt>aligned</tt>, <tt>packed</tt>,
418 all target specific attributes.</li>
419
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]420 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html#Other%20Builtins">Other Builtins</a>:
421 Other built-in functions.<br>
422 We support all builtins which have a C language equivalent (e.g.,
423 <tt>__builtin_cos</tt>), <tt>__builtin_alloca</tt>,
424 <tt>__builtin_types_compatible_p</tt>, <tt>__builtin_choose_expr</tt>,
Chris Lattnerceebeb62004-06-18 06:26:29 +0000[diff] [blame]425 <tt>__builtin_constant_p</tt>, and <tt>__builtin_expect</tt>
426 (currently ignored). We also support builtins for ISO C99 floating
427 point comparison macros (e.g., <tt>__builtin_islessequal</tt>).</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]428 </ol>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]429
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]430 <p>The following extensions <b>are</b> known to be supported:</p>
431
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]432 <ol>
Chris Lattner7fe97dd2004-03-16 08:54:07 +0000[diff] [blame]433 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Labels-as-Values.html#Labels%20as%20Values">Labels as Values</a>: Getting pointers to labels and computed gotos.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]434 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html#Statement%20Exprs">Statement Exprs</a>: Putting statements and declarations inside expressions.</li>
435 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Typeof.html#Typeof">Typeof</a>: <code>typeof</code>: referring to the type of an expression.</li>
Tanya Lattnerca26c3e2004-06-22 03:48:17 +0000[diff] [blame]436 <li><a href="http://gcc.gnu.org/onlinedocs/gcc-3.4.0/gcc/Lvalues.html#Lvalues">Lvalues</a>: Using <code>?:</code>, "<code>,</code>" and casts in lvalues.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]437 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Conditionals.html#Conditionals">Conditionals</a>: Omitting the middle operand of a <code>?:</code> expression.</li>
438 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Long-Long.html#Long%20Long">Long Long</a>: Double-word integers.</li>
439 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Complex.html#Complex">Complex</a>: Data types for complex numbers.</li>
440 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Hex-Floats.html#Hex%20Floats">Hex Floats</a>:Hexadecimal floating-point constants.</li>
441 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html#Zero%20Length">Zero Length</a>: Zero-length arrays.</li>
442 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Empty-Structures.html#Empty%20Structures">Empty Structures</a>: Structures with no members.</li>
443 <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>
444 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Escaped-Newlines.html#Escaped%20Newlines">Escaped Newlines</a>: Slightly looser rules for escaped newlines.</li>
445 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Subscripting.html#Subscripting">Subscripting</a>: Any array can be subscripted, even if not an lvalue.</li>
Misha Brukmanc4b7bee2003-12-12 04:37:31 +0000[diff] [blame]446 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Pointer-Arith.html#Pointer%20Arith">Pointer Arith</a>: Arithmetic on <code>void</code>-pointers and function pointers.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]447 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Initializers.html#Initializers">Initializers</a>: Non-constant initializers.</li>
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]448 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Compound-Literals.html#Compound%20Literals">Compound Literals</a>: Compound literals give structures, unions,
449or arrays as values.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]450 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Designated-Inits.html#Designated%20Inits">Designated Inits</a>: Labeling elements of initializers.</li>
Misha Brukmanc4b7bee2003-12-12 04:37:31 +0000[diff] [blame]451 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Cast-to-Union.html#Cast%20to%20Union">Cast to Union</a>: Casting to union type from any member of the union.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]452 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Case-Ranges.html#Case%20Ranges">Case Ranges</a>: `case 1 ... 9' and such.</li>
453 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Mixed-Declarations.html#Mixed%20Declarations">Mixed Declarations</a>: Mixing declarations and code.</li>
454 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Function-Prototypes.html#Function%20Prototypes">Function Prototypes</a>: Prototype declarations and old-style definitions.</li>
455 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/C---Comments.html#C++%20Comments">C++ Comments</a>: C++ comments are recognized.</li>
456 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Dollar-Signs.html#Dollar%20Signs">Dollar Signs</a>: Dollar sign is allowed in identifiers.</li>
457 <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>
458 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Alignment.html#Alignment">Alignment</a>: Inquiring about the alignment of a type or variable.</li>
459 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Inline.html#Inline">Inline</a>: Defining inline functions (as fast as macros).</li>
460 <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>
461 <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>
462 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Function-Names.html#Function%20Names">Function Names</a>: Printable strings which are the name of the current function.</li>
Chris Lattner25795bc2004-02-14 04:08:29 +0000[diff] [blame]463 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Return-Address.html#Return%20Address">Return Address</a>: Getting the return or frame address of a function.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]464 <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>
465 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Attribute-Syntax.html#Attribute%20Syntax">Attribute Syntax</a>: Formal syntax for attributes.</li>
Misha Brukmane0c891c2003-11-22 01:00:11 +0000[diff] [blame]466 </ol></li>
467
468</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]469
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]470<p>If you run into GCC extensions which have not been included in any of these
471lists, please let us know (also including whether or not they work).</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]472
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]473</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]474
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]475<!-- ======================================================================= -->
476<div class="doc_subsection">
477 <a name="c++-fe">Known problems with the C++ front-end</a>
478</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]479
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]480<div class="doc_text">
481
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]482<p>For this release, the C++ front-end is considered to be fully functional but
Chris Lattner9e848092003-12-12 04:25:33 +0000[diff] [blame]483has not been tested as thoroughly as the C front-end. It has been tested and
484works for a number of non-trivial programs, but there may be lurking bugs.
485Please report any bugs or problems.</p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]486
487</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]488
489<!-- _______________________________________________________________________ -->
Chris Lattner3a51be12004-02-14 04:12:41 +0000[diff] [blame]490<div class="doc_subsubsection">Bugs</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]491
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]492<div class="doc_text">
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]493
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]494<ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]495<li>The C++ front-end inherits all problems afflicting the <a href="#c-fe">C
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]496 front-end</a>.</li>
Chris Lattner7962f712004-07-17 02:04:41 +0000[diff] [blame]497
Chris Lattnerd5713882004-08-02 20:28:44 +0000[diff] [blame]498<li><b>IA-64 specific</b>: The C++ front-end does not use <a
499href="http://llvm.cs.uiuc.edu/PR406">IA64 ABI compliant layout of v-tables</a>.
Chris Lattner7962f712004-07-17 02:04:41 +0000[diff] [blame]500In particular, it just stores function pointers instead of function
501descriptors in the vtable. This bug prevents mixing C++ code compiled with
Chris Lattner04db8082004-08-02 20:29:51 +0000[diff] [blame]502LLVM with C++ objects compiled by other C++ compilers.</li>
Chris Lattner7962f712004-07-17 02:04:41 +0000[diff] [blame]503
Chris Lattnerd5713882004-08-02 20:28:44 +0000[diff] [blame]504</ul>
505
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]506</div>
507
508<!-- _______________________________________________________________________ -->
509<div class="doc_subsubsection">
510 Notes
511</div>
512
513<div class="doc_text">
514
515<ul>
Chris Lattnere01fcfb2003-10-27 18:30:37 +0000[diff] [blame]516
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]517<li>The C++ front-end is based on a pre-release of the GCC 3.4 C++ parser. This
518parser is significantly more standards compliant (and picky) than prior GCC
519versions. For more information, see the C++ section of the <a
Chris Lattner9e848092003-12-12 04:25:33 +0000[diff] [blame]520href="http://gcc.gnu.org/gcc-3.4/changes.html">GCC 3.4 release notes</a>.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]521
522<li>Destructors for local objects are not always run when a <tt>longjmp</tt> is
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]523 performed. In particular, destructors for objects in the <tt>longjmp</tt>ing
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]524 function and in the <tt>setjmp</tt> receiver function may not be run.
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]525 Objects in intervening stack frames will be destroyed, however (which is
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]526 better than most compilers).</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]527
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]528<li>The LLVM C++ front-end follows the <a
529 href="http://www.codesourcery.com/cxx-abi">Itanium C++ ABI</a>.
530 This document, which is not Itanium specific, specifies a standard for name
531 mangling, class layout, v-table layout, RTTI formats, and other C++
532 representation issues. Because we use this API, code generated by the LLVM
533 compilers should be binary compatible with machine code generated by other
534 Itanium ABI C++ compilers (such as G++, the Intel and HP compilers, etc).
535 <i>However</i>, the exception handling mechanism used by LLVM is very
536 different from the model used in the Itanium ABI, so <b>exceptions will not
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]537 interact correctly</b>. </li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]538
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]539</ul>
Chris Lattnerfcc54b32003-10-07 22:14:37 +0000[diff] [blame]540
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]541</div>
542
543<!-- ======================================================================= -->
544<div class="doc_subsection">
545 <a name="x86-be">Known problems with the X86 back-end</a>
546</div>
547
548<div class="doc_text">
549
550<ul>
Chris Lattnerd5713882004-08-02 20:28:44 +0000[diff] [blame]551 <li>none yet</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]552</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]553
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]554</div>
555
556<!-- ======================================================================= -->
557<div class="doc_subsection">
Misha Brukmanadb1c392004-07-12 16:55:41 +0000[diff] [blame]558 <a name="sparcv9-be">Known problems with the SparcV9 back-end</a>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]559</div>
560
561<div class="doc_text">
562
563<ul>
Misha Brukmanadb1c392004-07-12 16:55:41 +0000[diff] [blame]564<li><a href="http://llvm.cs.uiuc.edu/PR60">[sparcv9] SparcV9 backend miscompiles
565several programs in the LLVM test suite</a></li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]566</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]567
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]568</div>
569
570<!-- ======================================================================= -->
571<div class="doc_subsection">
572 <a name="c-be">Known problems with the C back-end</a>
573</div>
574
575<div class="doc_text">
576
577<ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]578
579<li>The C back-end produces code that violates the ANSI C Type-Based Alias
580Analysis rules. As such, special options may be necessary to compile the code
581(for example, GCC requires the <tt>-fno-strict-aliasing</tt> option). This
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]582problem probably cannot be fixed.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]583
Chris Lattnere84843b2003-10-20 19:05:03 +0000[diff] [blame]584<li><a href="http://llvm.cs.uiuc.edu/PR33">Initializers for global variables</a>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]585cannot include special floating point numbers like Not-A-Number or
586Infinity.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]587
Chris Lattner2855ecd2003-11-04 20:06:53 +0000[diff] [blame]588<li><a href="http://llvm.cs.uiuc.edu/PR56">Zero arg vararg functions are not
Chris Lattner2af46052003-10-24 04:03:19 +0000[diff] [blame]589supported</a>. This should not affect LLVM produced by the C or C++
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]590frontends.</li>
Chris Lattner2af46052003-10-24 04:03:19 +0000[diff] [blame]591
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]592</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]593
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]594</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]595
596<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]597<div class="doc_section">
598 <a name="additionalinfo">Additional Information</a>
599</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]600<!-- *********************************************************************** -->
601
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]602<div class="doc_text">
603
604<p>A wide variety of additional information is available on the LLVM web page,
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]605including mailing lists and publications describing algorithms and components
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]606implemented in LLVM. The web page also contains versions of the API
607documentation which is up-to-date with the CVS version of the source code. You
608can access versions of these documents specific to this release by going into
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]609the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]610
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]611<p>If you have any questions or comments about LLVM, please feel free to contact
Chris Lattner5eccca42003-12-12 21:22:16 +0000[diff] [blame]612us via the <a href="http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev">mailing
613lists</a>.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]614
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]615</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]616
617<!-- *********************************************************************** -->
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]618
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]619<hr>
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]620<address>
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625
Misha Brukmane0c891c2003-11-22 01:00:11 +0000[diff] [blame]626 <a href="http://llvm.cs.uiuc.edu">The LLVM Compiler Infrastructure</a><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]627 Last modified: $Date$
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]628</address>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]629
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]630</body>
631</html>