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gerrit-public.fairphone.software / toolchain / llvm-project / 99e4111d335f541c227d5d1da726531648b957b0 / . / llvm / docs / ReleaseNotes.html
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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 Lattner99e41112004-10-09 19:19:57 +0000[diff] [blame^]89 <li><a href="http://llvm.cs.uiuc.edu/PR257">move test/Programs out of the main llvm
Chris Lattner2249dd12004-09-19 19:21:26 +0000[diff] [blame]90 tree</a></li>
Chris Lattner163c3262004-08-16 00:20:18 +0000[diff] [blame]91<li></li>
Chris Lattner592db402003-11-19 22:05:38 +0000[diff] [blame]92</ol>
Chris Lattner4491de62003-11-08 04:28:55 +0000[diff] [blame]93
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]94</div>
95
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]96
97<!--=========================================================================-->
98<div class="doc_subsubsection">
99In this release, the following missing features were implemented:
100</div>
Chris Lattner4491de62003-11-08 04:28:55 +0000[diff] [blame]101
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]102<div class="doc_text">
103
Chris Lattner4491de62003-11-08 04:28:55 +0000[diff] [blame]104<ol>
Chris Lattner99e41112004-10-09 19:19:57 +0000[diff] [blame^]105<li><a href="http://llvm.cs.uiuc.edu/PR419">JIT interface should support arbitrary
Chris Lattner163c3262004-08-16 00:20:18 +0000[diff] [blame]106 calls</a></li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]107</ol>
Chris Lattnere7525b52003-10-07 21:38:31 +0000[diff] [blame]108
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]109</div>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]110
111<!--=========================================================================-->
112<div class="doc_subsubsection">
Misha Brukman017f2f32004-04-19 02:56:49 +0000[diff] [blame]113<a name="qualityofimp">In this release, the following Quality of Implementation
114issues were fixed:</a>
Chris Lattner4df78f02003-12-20 03:42:11 +0000[diff] [blame]115</div>
116
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]117<div class="doc_text">
118
Chris Lattner4df78f02003-12-20 03:42:11 +0000[diff] [blame]119<ol>
Chris Lattner99e41112004-10-09 19:19:57 +0000[diff] [blame^]120<li><a href="http://llvm.cs.uiuc.edu/PR426">[llvmg++] Tons of warnings are spewed when
Chris Lattner615ffb82004-08-20 00:36:23 +0000[diff] [blame]121 linking to libstdc++</a></li>
Chris Lattner99e41112004-10-09 19:19:57 +0000[diff] [blame^]122<li><a href="http://llvm.cs.uiuc.edu/PR352">include/{Support,Config} ->
Chris Lattner2249dd12004-09-19 19:21:26 +0000[diff] [blame]123 include/llvm/{Support,Config}</a></li>
Chris Lattner4df78f02003-12-20 03:42:11 +0000[diff] [blame]124</ol>
125
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]126</div>
127
Chris Lattner4df78f02003-12-20 03:42:11 +0000[diff] [blame]128<!--=========================================================================-->
129<div class="doc_subsubsection">
Chris Lattner8ebf2532004-02-25 16:36:51 +0000[diff] [blame]130In this release, the following build problems were fixed:
Brian Gaeke8b05e4f2004-01-16 21:55:04 +0000[diff] [blame]131</div>
132
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]133<div class="doc_text">
Brian Gaeke8b05e4f2004-01-16 21:55:04 +0000[diff] [blame]134<ol>
Chris Lattner163c3262004-08-16 00:20:18 +0000[diff] [blame]135<li></li>
Brian Gaeke8b05e4f2004-01-16 21:55:04 +0000[diff] [blame]136</ol>
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]137</div>
Brian Gaeke8b05e4f2004-01-16 21:55:04 +0000[diff] [blame]138
139<!--=========================================================================-->
140<div class="doc_subsubsection">
Chris Lattner2ad48782004-05-02 04:19:15 +0000[diff] [blame]141<a name="codequality">This release includes the following Code Quality
142improvements:</a>
Chris Lattner23257062004-05-23 20:42:08 +0000[diff] [blame]143</div>
Chris Lattner639579c2003-10-27 17:06:39 +0000[diff] [blame]144
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]145<div class="doc_text">
Chris Lattner639579c2003-10-27 17:06:39 +0000[diff] [blame]146<ol>
Chris Lattner99e41112004-10-09 19:19:57 +0000[diff] [blame^]147<li><a href="http://llvm.cs.uiuc.edu/PR362">Ugly code generator for
Chris Lattner2249dd12004-09-19 19:21:26 +0000[diff] [blame]148 std::min/std::max</a></li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]149</ol>
Reid Spencer3e58f582004-05-23 17:23:13 +0000[diff] [blame]150</div>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]151
152<!--=========================================================================-->
153<div class="doc_subsubsection">
Misha Brukman017f2f32004-04-19 02:56:49 +0000[diff] [blame]154<a name="bugfix">In this release, the following bugs in the previous release
155were fixed:</a>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]156</div>
157
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]158<div class="doc_text">
159
Chris Lattner5cd40922004-08-02 20:28:44 +0000[diff] [blame]160<p>Bugs fixed in the LLVM Core:</p>
Chris Lattnere7525b52003-10-07 21:38:31 +0000[diff] [blame]161
162<ol>
Chris Lattner99e41112004-10-09 19:19:57 +0000[diff] [blame^]163<li><a href="http://llvm.cs.uiuc.edu/PR420">[licm] LICM invalidates alias analysis info
Chris Lattner59d448f2004-09-15 01:09:25 +0000[diff] [blame]164 and uses broken information</a> (optimizer crash)</li>
Chris Lattner99e41112004-10-09 19:19:57 +0000[diff] [blame^]165<li><a href="http://llvm.cs.uiuc.edu/PR422">[asmwriter] Asmwriter is really slow for
Chris Lattner59d448f2004-09-15 01:09:25 +0000[diff] [blame]166 functions with lots of values</a></li>
Chris Lattner99e41112004-10-09 19:19:57 +0000[diff] [blame^]167<li><a href="http://llvm.cs.uiuc.edu/PR423">[anders-aa] Andersen's AA is completely
Chris Lattnera10ed3b2004-08-16 05:46:57 +0000[diff] [blame]168 broken in LLVM 1.3</a></li>
Chris Lattner99e41112004-10-09 19:19:57 +0000[diff] [blame^]169<li><a href="http://llvm.cs.uiuc.edu/PR430">[bcwriter] Empty compaction tables
Reid Spencer7d0a1232004-08-27 00:48:26 +0000[diff] [blame]170 defined</a></li>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]171</ol>
172
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]173<p>Bugs in the C/C++ front-end:</p>
174
175<ol>
Chris Lattner99e41112004-10-09 19:19:57 +0000[diff] [blame^]176<li><a href="http://llvm.cs.uiuc.edu/PR445">[llvmg++] not enough templates are instantiated</a></li>
177<li><a href="http://llvm.cs.uiuc.edu/PR450">[llvmg++] Extern const globals cannot be
Chris Lattner2426ff92004-10-05 00:23:02 +0000[diff] [blame]178marked 'constant' if they have nontrivial ctors or dtors</a></li>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]179</ol>
Brian Gaeke730d8d62004-08-24 07:43:48 +0000[diff] [blame]180
181<p>Bugs fixed in the Sparc V9 back-end:</p>
182
183<ol>
Chris Lattner99e41112004-10-09 19:19:57 +0000[diff] [blame^]184<li><a href="http://llvm.cs.uiuc.edu/PR428">[sparcv9] regalloc assertion
Brian Gaeke730d8d62004-08-24 07:43:48 +0000[diff] [blame]185 failure with certain indirect calls</a></li>
186</ol>
187
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]188</div>
Reid Spencer3e58f582004-05-23 17:23:13 +0000[diff] [blame]189
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]190<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]191<div class="doc_section">
192 <a name="portability">Portability and Supported Platforms</a>
193</div>
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]194<!-- *********************************************************************** -->
195
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]196<div class="doc_text">
197
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]198<p>LLVM is known to work in the following platforms:</p>
199
200<ul>
201<li>Intel and AMD machines running Red Hat Linux and FreeBSD (and probably
202 other unix-like systems).</li>
203<li>Sun UltraSPARC workstations running Solaris 8.</li>
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]204<li>Intel and AMD machines running on Win32 with the Cygwin libraries.</li>
Chris Lattnerd21e3d02004-08-05 21:53:13 +0000[diff] [blame]205<li>PowerPC-based Mac OS X boxes, running 10.2 and above. Note that no JIT
206support is available yet, and LLC support is beta. The C backend can be used
207to produce stable code for this platform.</li>
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]208</ul>
209
Brian Gaekee3e557e2004-05-09 05:28:35 +0000[diff] [blame]210<p>The core LLVM infrastructure uses
211<a href="http://www.gnu.org/software/autoconf/">GNU autoconf</a> to adapt itself
212to the machine and operating system on which it is built. However, minor
213porting may be required to get LLVM to work on new platforms. We welcome your
214portability patches and reports of successful builds or error messages.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]215
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]216<p>Note that the LLVM build system does not currently support directories with
217spaces on them when running on Win32/cygwin. We strongly recommend running
218LLVM and the C frontend out of a top-level directory without spaces (e.g.,
Chris Lattnerce1a3842004-06-01 19:41:30 +0000[diff] [blame]219<tt>/cygdrive/c/llvm</tt>). Also, make sure to install <b>all</b> of the
220cygwin packages. By default, many important tools are not installed that
Chris Lattnera752fce2004-08-16 20:20:46 +0000[diff] [blame]221are needed by the LLVM build process or test suite (e.g., /bin/time). Finally,
222please make sure that there are no directories with spaces in them in your
223PATH environment variable.</p>
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]224
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]225</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]226
227<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]228<div class="doc_section">
229 <a name="knownproblems">Known Problems</a>
230</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]231<!-- *********************************************************************** -->
232
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]233<div class="doc_text">
234
235<p>This section contains all known problems with the LLVM system, listed by
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]236component. As new problems are discovered, they will be added to these
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]237sections. If you run into a problem, please check the <a
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]238href="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]239there isn't already one.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]240
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]241</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]242
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]243<!-- ======================================================================= -->
244<div class="doc_subsection">
245 <a name="experimental">Experimental features included with this release</a>
246</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]247
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]248<div class="doc_text">
249
Misha Brukmanfa50a222004-05-12 21:46:05 +0000[diff] [blame]250<p>The following components of this LLVM release are either untested, known to
251be broken or unreliable, or are in early development. These components should
252not be relied on, and bugs should not be filed against them, but they may be
253useful to some people. In particular, if you would like to work on one of these
254components, please contact us on the llvmdev list.</p>
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]255
256<ul>
Misha Brukman467ea6b2004-08-05 21:04:03 +0000[diff] [blame]257<li>The PowerPC backend is incomplete and is known to miscompile several SPEC
258benchmarks. The file <tt>llvm/lib/Target/PowerPC/README.txt</tt> has
259details.</li>
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]260<li>The following passes are incomplete or buggy: <tt>-pgmdep, -memdep,
Chris Lattner09f3ac92004-09-14 16:43:13 +0000[diff] [blame]261 -ipmodref, -cee, -branch-combine, -instloops, -paths</tt></li>
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]262<li>The <tt>-pre</tt> pass is incomplete (there are cases it doesn't handle that
263 it should) and not thoroughly tested.</li>
264<li>The <tt>llvm-ar</tt> tool is incomplete and probably buggy.</li>
265<li>The <tt>llvm-db</tt> tool is in a very early stage of development.</li>
266</ul>
267
268</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]269
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]270<!-- ======================================================================= -->
271<div class="doc_subsection">
272 <a name="core">Known problems with the LLVM Core</a>
273</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]274
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]275<div class="doc_text">
276
277<ul>
278
279<li>In the JIT, <tt>dlsym</tt> on a symbol compiled by the JIT will not
280work.</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]281
282<li>The JIT does not use mutexes to protect its internal data structures. As
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]283such, execution of a threaded program could cause these data structures to be
284corrupted.</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]285
Chris Lattnerc0171082004-08-08 03:33:07 +0000[diff] [blame]286<li>Linking in static archive files (.a files) is slow (there is no symbol
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]287table in the archive).</li>
Chris Lattnerc679fbb2003-11-04 20:06:53 +0000[diff] [blame]288
Misha Brukman017f2f32004-04-19 02:56:49 +0000[diff] [blame]289<li>The gccld program <a href="http://llvm.cs.uiuc.edu/PR139">does not link
290objects/archives in the order specified on the command line.</a></li>
Chris Lattneraebc66a2004-02-15 23:09:07 +0000[diff] [blame]291
292<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]293values live across a setjmp as volatile</a>. This missing feature only affects
Chris Lattneraebc66a2004-02-15 23:09:07 +0000[diff] [blame]294targets whose setjmp/longjmp libraries do not save and restore the entire
295register file.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]296</ul>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]297</div>
298
299<!-- ======================================================================= -->
300<div class="doc_subsection">
301 <a name="c-fe">Known problems with the C front-end</a>
302</div>
Chris Lattner178f3db2003-10-02 05:07:23 +0000[diff] [blame]303
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]304<!-- _______________________________________________________________________ -->
Chris Lattner5a8a7282003-12-14 05:03:43 +0000[diff] [blame]305<div class="doc_subsubsection">Bugs</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]306
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]307<div class="doc_text">
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]308<ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]309<li>C99 Variable sized arrays do not release stack memory when they go out of
310 scope. Thus, the following program may run out of stack space:
311<pre>
312 for (i = 0; i != 1000000; ++i) {
313 int X[n];
314 foo(X);
315 }
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]316</pre></li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]317
Misha Brukmanfa50a222004-05-12 21:46:05 +0000[diff] [blame]318<li>Initialization of global union variables can only be done <a
319href="http://llvm.cs.uiuc.edu/bugs/show_bug.cgi?id=162">with the largest union
320member</a>.</li>
Chris Lattner1ab58dd2004-03-16 21:39:04 +0000[diff] [blame]321
Misha Brukman017f2f32004-04-19 02:56:49 +0000[diff] [blame]322<li><a href="http://llvm.cs.uiuc.edu/PR244">[llvm-gcc] Error when an implicitly
323external function is re-declared as static</a></li>
Chris Lattner1ab58dd2004-03-16 21:39:04 +0000[diff] [blame]324
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]325</ul>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]326</div>
327
328<!-- _______________________________________________________________________ -->
329<div class="doc_subsubsection">
330 Notes
331</div>
332
333<div class="doc_text">
334
335<ul>
336
337<li>Inline assembly is not yet supported.</li>
Chris Lattnerd2a74272003-10-27 18:30:37 +0000[diff] [blame]338
339<li>"long double" is transformed by the front-end into "double". There is no
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]340support for floating point data types of any size other than 32 and 64
341bits.</li>
342
343<li>The following Unix system functionality has not been tested and may not
344work:
Misha Brukman7cb4e382003-11-22 01:00:11 +0000[diff] [blame]345 <ol>
346 <li><tt>sigsetjmp</tt>, <tt>siglongjmp</tt> - These are not turned into the
347 appropriate <tt>invoke</tt>/<tt>unwind</tt> instructions. Note that
348 <tt>setjmp</tt> and <tt>longjmp</tt> <em>are</em> compiled correctly.
349 <li><tt>getcontext</tt>, <tt>setcontext</tt>, <tt>makecontext</tt>
350 - These functions have not been tested.
351 </ol></li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]352
353<li>Although many GCC extensions are supported, some are not. In particular,
354 the following extensions are known to <b>not be</b> supported:
355 <ol>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]356 <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]357 <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>
358 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Constructing-Calls.html#Constructing%20Calls">Constructing Calls</a>: Dispatching a call to another function.</li>
359 <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]360 <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]361 <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>
362 <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]363 <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>
364 <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>
365 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Thread-Local.html#Thread-Local">Thread-Local</a>: Per-thread variables.</li>
366 <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]367 </ol>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]368
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]369 <p>The following GCC extensions are <b>partially</b> supported. An ignored
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]370 attribute means that the LLVM compiler ignores the presence of the attribute,
371 but the code should still work. An unsupported attribute is one which is
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]372 ignored by the LLVM compiler and will cause a different interpretation of
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]373 the program.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]374
375 <ol>
376 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Length.html#Variable%20Length">Variable Length</a>:
377 Arrays whose length is computed at run time.<br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]378 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]379
380 <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]381
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]382 Declaring that functions have no side effects or that they can never
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]383 return.<br>
384
385 <b>Supported:</b> <tt>format</tt>, <tt>format_arg</tt>, <tt>non_null</tt>,
386 <tt>constructor</tt>, <tt>destructor</tt>, <tt>unused</tt>,
387 <tt>deprecated</tt>, <tt>warn_unused_result</tt>, <tt>weak</tt><br>
388
389 <b>Ignored:</b> <tt>noreturn</tt>, <tt>noinline</tt>,
390 <tt>always_inline</tt>, <tt>pure</tt>, <tt>const</tt>, <tt>nothrow</tt>,
391 <tt>malloc</tt>, <tt>no_instrument_function</tt>, <tt>cdecl</tt><br>
392
393 <b>Unsupported:</b> <tt>used</tt>, <tt>section</tt>, <tt>alias</tt>,
394 <tt>visibility</tt>, <tt>regparm</tt>, <tt>stdcall</tt>,
395 <tt>fastcall</tt>, all other target specific attributes</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]396
397 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Attributes.html#Variable%20Attributes">Variable Attributes</a>:
398 Specifying attributes of variables.<br>
399 <b>Supported:</b> <tt>cleanup</tt>, <tt>common</tt>, <tt>nocommon</tt>,
400 <tt>deprecated</tt>, <tt>transparent_union</tt>,
401 <tt>unused</tt>, <tt>weak</tt><br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]402
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]403 <b>Unsupported:</b> <tt>aligned</tt>, <tt>mode</tt>, <tt>packed</tt>,
404 <tt>section</tt>, <tt>shared</tt>, <tt>tls_model</tt>,
405 <tt>vector_size</tt>, <tt>dllimport</tt>,
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]406 <tt>dllexport</tt>, all target specific attributes.</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]407
Misha Brukman8395d732003-12-12 04:37:31 +0000[diff] [blame]408 <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]409 <b>Supported:</b> <tt>transparent_union</tt>, <tt>unused</tt>,
Misha Brukman8395d732003-12-12 04:37:31 +0000[diff] [blame]410 <tt>deprecated</tt>, <tt>may_alias</tt><br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]411
412 <b>Unsupported:</b> <tt>aligned</tt>, <tt>packed</tt>,
413 all target specific attributes.</li>
414
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]415 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html#Other%20Builtins">Other Builtins</a>:
416 Other built-in functions.<br>
417 We support all builtins which have a C language equivalent (e.g.,
418 <tt>__builtin_cos</tt>), <tt>__builtin_alloca</tt>,
419 <tt>__builtin_types_compatible_p</tt>, <tt>__builtin_choose_expr</tt>,
Chris Lattnerb7c4bac2004-06-18 06:26:29 +0000[diff] [blame]420 <tt>__builtin_constant_p</tt>, and <tt>__builtin_expect</tt>
421 (currently ignored). We also support builtins for ISO C99 floating
422 point comparison macros (e.g., <tt>__builtin_islessequal</tt>).</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]423 </ol>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]424
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]425 <p>The following extensions <b>are</b> known to be supported:</p>
426
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]427 <ol>
Chris Lattnerd3dc8502004-03-16 08:54:07 +0000[diff] [blame]428 <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]429 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html#Statement%20Exprs">Statement Exprs</a>: Putting statements and declarations inside expressions.</li>
430 <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]431 <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]432 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Conditionals.html#Conditionals">Conditionals</a>: Omitting the middle operand of a <code>?:</code> expression.</li>
433 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Long-Long.html#Long%20Long">Long Long</a>: Double-word integers.</li>
434 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Complex.html#Complex">Complex</a>: Data types for complex numbers.</li>
435 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Hex-Floats.html#Hex%20Floats">Hex Floats</a>:Hexadecimal floating-point constants.</li>
436 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html#Zero%20Length">Zero Length</a>: Zero-length arrays.</li>
437 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Empty-Structures.html#Empty%20Structures">Empty Structures</a>: Structures with no members.</li>
438 <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>
439 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Escaped-Newlines.html#Escaped%20Newlines">Escaped Newlines</a>: Slightly looser rules for escaped newlines.</li>
440 <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]441 <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]442 <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]443 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Compound-Literals.html#Compound%20Literals">Compound Literals</a>: Compound literals give structures, unions,
444or arrays as values.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]445 <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]446 <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]447 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Case-Ranges.html#Case%20Ranges">Case Ranges</a>: `case 1 ... 9' and such.</li>
448 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Mixed-Declarations.html#Mixed%20Declarations">Mixed Declarations</a>: Mixing declarations and code.</li>
449 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Function-Prototypes.html#Function%20Prototypes">Function Prototypes</a>: Prototype declarations and old-style definitions.</li>
450 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/C---Comments.html#C++%20Comments">C++ Comments</a>: C++ comments are recognized.</li>
451 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Dollar-Signs.html#Dollar%20Signs">Dollar Signs</a>: Dollar sign is allowed in identifiers.</li>
452 <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>
453 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Alignment.html#Alignment">Alignment</a>: Inquiring about the alignment of a type or variable.</li>
454 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Inline.html#Inline">Inline</a>: Defining inline functions (as fast as macros).</li>
455 <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>
456 <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>
457 <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]458 <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]459 <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>
460 <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]461 </ol></li>
462
463</ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]464
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]465<p>If you run into GCC extensions which have not been included in any of these
466lists, please let us know (also including whether or not they work).</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]467
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]468</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]469
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]470<!-- ======================================================================= -->
471<div class="doc_subsection">
472 <a name="c++-fe">Known problems with the C++ front-end</a>
473</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]474
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]475<div class="doc_text">
476
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]477<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]478has not been tested as thoroughly as the C front-end. It has been tested and
479works for a number of non-trivial programs, but there may be lurking bugs.
480Please report any bugs or problems.</p>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]481
482</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]483
484<!-- _______________________________________________________________________ -->
Chris Lattner141ebb62004-02-14 04:12:41 +0000[diff] [blame]485<div class="doc_subsubsection">Bugs</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]486
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]487<div class="doc_text">
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]488
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]489<ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]490<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]491 front-end</a>.</li>
Chris Lattner041e6c92004-07-17 02:04:41 +0000[diff] [blame]492
Chris Lattner5cd40922004-08-02 20:28:44 +0000[diff] [blame]493<li><b>IA-64 specific</b>: The C++ front-end does not use <a
494href="http://llvm.cs.uiuc.edu/PR406">IA64 ABI compliant layout of v-tables</a>.
Chris Lattner041e6c92004-07-17 02:04:41 +0000[diff] [blame]495In particular, it just stores function pointers instead of function
496descriptors in the vtable. This bug prevents mixing C++ code compiled with
Chris Lattner2fd93492004-08-02 20:29:51 +0000[diff] [blame]497LLVM with C++ objects compiled by other C++ compilers.</li>
Chris Lattner041e6c92004-07-17 02:04:41 +0000[diff] [blame]498
Chris Lattner5cd40922004-08-02 20:28:44 +0000[diff] [blame]499</ul>
500
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]501</div>
502
503<!-- _______________________________________________________________________ -->
504<div class="doc_subsubsection">
505 Notes
506</div>
507
508<div class="doc_text">
509
510<ul>
Chris Lattnerd2a74272003-10-27 18:30:37 +0000[diff] [blame]511
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]512<li>The C++ front-end is based on a pre-release of the GCC 3.4 C++ parser. This
513parser is significantly more standards compliant (and picky) than prior GCC
514versions. For more information, see the C++ section of the <a
Chris Lattnere76e9ab2003-12-12 04:25:33 +0000[diff] [blame]515href="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]516
517<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]518 performed. In particular, destructors for objects in the <tt>longjmp</tt>ing
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]519 function and in the <tt>setjmp</tt> receiver function may not be run.
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]520 Objects in intervening stack frames will be destroyed, however (which is
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]521 better than most compilers).</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]522
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]523<li>The LLVM C++ front-end follows the <a
524 href="http://www.codesourcery.com/cxx-abi">Itanium C++ ABI</a>.
525 This document, which is not Itanium specific, specifies a standard for name
526 mangling, class layout, v-table layout, RTTI formats, and other C++
527 representation issues. Because we use this API, code generated by the LLVM
528 compilers should be binary compatible with machine code generated by other
529 Itanium ABI C++ compilers (such as G++, the Intel and HP compilers, etc).
530 <i>However</i>, the exception handling mechanism used by LLVM is very
531 different from the model used in the Itanium ABI, so <b>exceptions will not
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]532 interact correctly</b>. </li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]533
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]534</ul>
Chris Lattner46ecf612003-10-07 22:14:37 +0000[diff] [blame]535
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]536</div>
537
538<!-- ======================================================================= -->
539<div class="doc_subsection">
540 <a name="x86-be">Known problems with the X86 back-end</a>
541</div>
542
543<div class="doc_text">
544
545<ul>
Chris Lattner5cd40922004-08-02 20:28:44 +0000[diff] [blame]546 <li>none yet</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]547</ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]548
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]549</div>
550
551<!-- ======================================================================= -->
552<div class="doc_subsection">
Misha Brukmana516e992004-07-12 16:55:41 +0000[diff] [blame]553 <a name="sparcv9-be">Known problems with the SparcV9 back-end</a>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]554</div>
555
556<div class="doc_text">
557
558<ul>
Misha Brukmana516e992004-07-12 16:55:41 +0000[diff] [blame]559<li><a href="http://llvm.cs.uiuc.edu/PR60">[sparcv9] SparcV9 backend miscompiles
560several programs in the LLVM test suite</a></li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]561</ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]562
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]563</div>
564
565<!-- ======================================================================= -->
566<div class="doc_subsection">
567 <a name="c-be">Known problems with the C back-end</a>
568</div>
569
570<div class="doc_text">
571
572<ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]573
574<li>The C back-end produces code that violates the ANSI C Type-Based Alias
575Analysis rules. As such, special options may be necessary to compile the code
576(for example, GCC requires the <tt>-fno-strict-aliasing</tt> option). This
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]577problem probably cannot be fixed.</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]578
Chris Lattnera623e482003-10-20 19:05:03 +0000[diff] [blame]579<li><a href="http://llvm.cs.uiuc.edu/PR33">Initializers for global variables</a>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]580cannot include special floating point numbers like Not-A-Number or
581Infinity.</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]582
Chris Lattnerc679fbb2003-11-04 20:06:53 +0000[diff] [blame]583<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]584supported</a>. This should not affect LLVM produced by the C or C++
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]585frontends.</li>
Chris Lattnerb28c3282003-10-24 04:03:19 +0000[diff] [blame]586
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]587</ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]588
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]589</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]590
591<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]592<div class="doc_section">
593 <a name="additionalinfo">Additional Information</a>
594</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]595<!-- *********************************************************************** -->
596
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]597<div class="doc_text">
598
599<p>A wide variety of additional information is available on the LLVM web page,
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]600including mailing lists and publications describing algorithms and components
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]601implemented in LLVM. The web page also contains versions of the API
602documentation which is up-to-date with the CVS version of the source code. You
603can access versions of these documents specific to this release by going into
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]604the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]605
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]606<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]607us via the <a href="http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev">mailing
608lists</a>.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]609
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]610</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]611
612<!-- *********************************************************************** -->
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]613
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]614<hr>
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]615<address>
Misha Brukman8834af92003-12-21 22:53:21 +0000[diff] [blame]616 <a href="http://jigsaw.w3.org/css-validator/check/referer"><img
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618 <a href="http://validator.w3.org/check/referer"><img
619 src="http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01!" /></a>
620
Misha Brukman7cb4e382003-11-22 01:00:11 +0000[diff] [blame]621 <a href="http://llvm.cs.uiuc.edu">The LLVM Compiler Infrastructure</a><br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]622 Last modified: $Date$
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]623</address>
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Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]625</body>
626</html>