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gerrit-public.fairphone.software / fp2-dev / platform / external / llvm / f79e57ef0968d9d17af5f7836bd878cc883d3aaf / . / docs / ReleaseNotes.html
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Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
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3<html>
4<head>
Reid Spencer6454ed32004-11-18 18:38:58 +0000[diff] [blame]5 <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]6 <link rel="stylesheet" href="llvm.css" type="text/css">
Chris Lattner78bf32b2004-12-09 22:22:58 +0000[diff] [blame]7 <title>LLVM 1.5 Release Notes</title>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]8</head>
9<body>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]10
Chris Lattner78bf32b2004-12-09 22:22:58 +0000[diff] [blame]11<div class="doc_title">LLVM 1.5 Release Notes</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]12
13<ol>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]14 <li><a href="#intro">Introduction</a></li>
15 <li><a href="#whatsnew">What's New?</a></li>
Chris Lattner4b538b92004-04-30 22:17:12 +0000[diff] [blame]16 <li><a href="GettingStarted.html">Installation Instructions</a></li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]17 <li><a href="#portability">Portability and Supported Platforms</a></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]18 <li><a href="#knownproblems">Known Problems</a>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]19 <li><a href="#additionalinfo">Additional Information</a></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]20</ol>
21
Chris Lattner7911ce22004-05-23 21:07:27 +0000[diff] [blame]22<div class="doc_author">
Chris Lattner78bf32b2004-12-09 22:22:58 +0000[diff] [blame]23 <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]24</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]25
26<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]27<div class="doc_section">
28 <a name="intro">Introduction</a>
29</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]30<!-- *********************************************************************** -->
31
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]32<div class="doc_text">
33
34<p>This document contains the release notes for the LLVM compiler
Chris Lattner78bf32b2004-12-09 22:22:58 +0000[diff] [blame]35infrastructure, release 1.5. Here we describe the status of LLVM, including any
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame]36known problems and improvements from the previous release. The most up-to-date
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]37version of this document can be found on the <a
Chris Lattner78bf32b2004-12-09 22:22:58 +0000[diff] [blame]38href="http://llvm.cs.uiuc.edu/releases/1.5/">LLVM 1.5 web site</a>. If you are
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]39not reading this on the LLVM web pages, you should probably go there because
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]40this document may be updated after the release.</p>
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]41
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame]42<p>For more information about LLVM, including information about the latest
43release, please check out the <a href="http://llvm.cs.uiuc.edu">main LLVM
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]44web site</a>. If you have questions or comments, the <a
45href="http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVM developer's mailing
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]46list</a> is a good place to send them.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]47
Chris Lattner78bf32b2004-12-09 22:22:58 +0000[diff] [blame]48<p>Note that if you are reading this file from CVS or the main LLVM web page,
49this document applies to the <i>next</i> release, not the current one. To see
50the release notes for the current or previous releases, see the <a
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]51href="http://llvm.cs.uiuc.edu/releases/">releases page</a>.</p>
52
53</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]54
55<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]56<div class="doc_section">
57 <a name="whatsnew">What's New?</a>
58</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]59<!-- *********************************************************************** -->
60
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]61<div class="doc_text">
62
Chris Lattner78bf32b2004-12-09 22:22:58 +0000[diff] [blame]63<p>This is the sixth public release of the LLVM compiler infrastructure.</p>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]64
Chris Lattner0bce6ac2004-12-10 16:27:34 +0000[diff] [blame]65<p> At this time, LLVM is known to correctly compile a broad range of C and
Chris Lattner78bf32b2004-12-09 22:22:58 +0000[diff] [blame]66C++ programs, including the SPEC CPU95 &amp; 2000 suite. TODO. It also includes
67bug fixes for those problems found since the 1.4 release.</p>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]68
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]69</div>
70
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]71<!--=========================================================================-->
72<div class="doc_subsubsection">
Chris Lattnera39719f2004-02-25 16:36:51 +0000[diff] [blame]73<a name="newfeatures">This release implements the following new features:</a>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]74</div>
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]75
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]76<div class="doc_text">
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]77<ol>
Chris Lattner74d74cd2004-12-11 06:10:52 +0000[diff] [blame]78 <li>LLVM now includes an <a href="http://llvm.cs.uiuc.edu/PR415">
Chris Lattnerda1f03c2005-01-22 18:45:35 +0000[diff] [blame]79 Interprocedural Sparse Conditional Constant Propagation</a> pass, named
Chris Lattner74d74cd2004-12-11 06:10:52 +0000[diff] [blame]80 -ipsccp, which is run by default at link-time.</li>
Chris Lattner75008d82005-02-01 01:33:52 +0000[diff] [blame]81 <li>LLVM 1.5 is now about 15% faster than LLVM 1.4 and its core data structures
Chris Lattner2e12c742005-02-13 22:27:24 +0000[diff] [blame]82 use about 30% less memory.</li>
Misha Brukman89976ff2005-03-18 00:48:56 +0000[diff] [blame]83 <li>LLVM includes new experimental native code generators for SparcV8,
84 Alpha, and IA64.</li>
Chris Lattner2e12c742005-02-13 22:27:24 +0000[diff] [blame]85 <li>Support for Microsoft Visual Studio is improved, and <a
Chris Lattnera5d803e2005-02-14 22:58:38 +0000[diff] [blame]86 href="GettingStartedVS.html">now documented</a>.</li>
Chris Lattner55ee0312003-11-19 22:05:38 +0000[diff] [blame]87</ol>
Chris Lattner0ef19062003-11-08 04:28:55 +0000[diff] [blame]88
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]89</div>
90
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]91
92<!--=========================================================================-->
93<div class="doc_subsubsection">
94In this release, the following missing features were implemented:
95</div>
Chris Lattner0ef19062003-11-08 04:28:55 +0000[diff] [blame]96
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]97<div class="doc_text">
98
Chris Lattner0ef19062003-11-08 04:28:55 +0000[diff] [blame]99<ol>
Chris Lattnerd7934542005-02-28 16:52:28 +0000[diff] [blame]100 <li>LLVM can now create native shared libraries with '<tt>llvm-gcc ...
101 -shared -Wl,-native</tt>' (or with <tt>-Wl,-native-cbe</tt>).</li>
Chris Lattnerd03b3bc2005-03-11 06:16:26 +0000[diff] [blame]102 <li>LLVM now supports a new "<a href="LangRef.html#i_prefetch">llvm.prefetch
103 </a>" intrinsic, and llvm-gcc now supports __builtin_prefetch.
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]104</ol>
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]105
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]106</div>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]107
108<!--=========================================================================-->
109<div class="doc_subsubsection">
Misha Brukmana7aadf12004-04-19 02:56:49 +0000[diff] [blame]110<a name="qualityofimp">In this release, the following Quality of Implementation
111issues were fixed:</a>
Chris Lattnere29ac162003-12-20 03:42:11 +0000[diff] [blame]112</div>
113
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]114<div class="doc_text">
115
Chris Lattnere29ac162003-12-20 03:42:11 +0000[diff] [blame]116<ol>
Chris Lattnerda1f03c2005-01-22 18:45:35 +0000[diff] [blame]117 <li><a href="http://llvm.cs.uiuc.edu/PR448">Building LLVM in optimized mode
118 should no longer cause GCC to hit swap in the PowerPC backend.</a></li>
Brian Gaeke6b31beb2004-01-16 21:55:04 +0000[diff] [blame]119</ol>
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]120</div>
Brian Gaeke6b31beb2004-01-16 21:55:04 +0000[diff] [blame]121
122<!--=========================================================================-->
123<div class="doc_subsubsection">
Chris Lattner6e1ef192004-05-02 04:19:15 +0000[diff] [blame]124<a name="codequality">This release includes the following Code Quality
125improvements:</a>
Chris Lattneraab56d42004-05-23 20:42:08 +0000[diff] [blame]126</div>
Chris Lattner89ca2b82003-10-27 17:06:39 +0000[diff] [blame]127
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]128<div class="doc_text">
Chris Lattner89ca2b82003-10-27 17:06:39 +0000[diff] [blame]129<ol>
Chris Lattner78bf32b2004-12-09 22:22:58 +0000[diff] [blame]130 <li></li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]131</ol>
Reid Spencer8e0262f2004-05-23 17:23:13 +0000[diff] [blame]132</div>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]133
134<!--=========================================================================-->
135<div class="doc_subsubsection">
Misha Brukmana7aadf12004-04-19 02:56:49 +0000[diff] [blame]136<a name="bugfix">In this release, the following bugs in the previous release
137were fixed:</a>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]138</div>
139
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]140<div class="doc_text">
141
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]142
Chris Lattnerf54e9cb2005-02-14 16:57:55 +0000[diff] [blame]143<p>Bugs fixed in the LLVM Core:</p>
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]144<ol>
Chris Lattnerbfd24682004-12-29 04:39:50 +0000[diff] [blame]145 <li><a href="http://llvm.cs.uiuc.edu/PR491">[dse] DSE deletes stores that
146 are partially overwritten by smaller stores</a></li>
Chris Lattnerf79e57e2005-04-19 06:08:04 +0000[diff] [blame^]147 <li><a href="http://llvm.cs.uiuc.edu/PR548">[instcombine] miscompilation of
148 setcc or setcc in one case</a></li>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]149</ol>
150
Chris Lattnerf54e9cb2005-02-14 16:57:55 +0000[diff] [blame]151<p>Code Generator Bugs:</p>
152<ol>
153 <li><a href="http://llvm.cs.uiuc.edu/PR490">[cbackend] Logical constant
154 expressions (and/or/xor) not implemented</a></li>
155 <li><a href="http://llvm.cs.uiuc.edu/PR511">[cbackend] C backend does not
156 respect 'volatile'</a></li>
157</ol>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]158
Chris Lattnerf54e9cb2005-02-14 16:57:55 +0000[diff] [blame]159<p>Bugs in the C/C++ front-end:</p>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]160<ol>
Chris Lattner8de9f232005-01-03 04:20:21 +0000[diff] [blame]161 <li><a href="http://llvm.cs.uiuc.edu/PR487">[llvmgcc] llvm-gcc incorrectly
162 rejects some constant initializers involving the addresses of array
163 elements</a></li>
Chris Lattnerf832f6a2005-02-11 19:29:52 +0000[diff] [blame]164 <li><a href="http://llvm.cs.uiuc.edu/PR501">[llvm-g++] Crash compiling
165 anonymous union</a></li>
Chris Lattnerf54e9cb2005-02-14 16:57:55 +0000[diff] [blame]166 <li><a href="http://llvm.cs.uiuc.edu/PR509">[llvm-g++] Do not use dynamic
167 initialization where static init will do</a></li>
Chris Lattner4a9dc292005-02-15 05:28:06 +0000[diff] [blame]168 <li><a href="http://llvm.cs.uiuc.edu/PR510">[llvmgcc] Field offset
169 miscalculated for some structure fields following bit fields</a></li>
Chris Lattner5ad907a2005-02-15 07:02:12 +0000[diff] [blame]170 <li><a href="http://llvm.cs.uiuc.edu/PR513">[llvm-g++] Temporary lifetimes
171 incorrect for short circuit logical operations</a></li>
Chris Lattnerc1f90a92005-02-19 07:29:25 +0000[diff] [blame]172 <li><a href="http://llvm.cs.uiuc.edu/PR517">[llvm-gcc] Crash compiling
173 bitfield &lt;-&gt; aggregate assignment</a></li>
Chris Lattner94f6ac72005-02-19 17:13:20 +0000[diff] [blame]174 <li><a href="http://llvm.cs.uiuc.edu/PR520">[llvm-g++] Error compiling
Chris Lattnerd12b9b22005-02-19 17:17:32 +0000[diff] [blame]175 virtual function thunk with an unnamed argument</a></li>
Chris Lattner290d2292005-02-20 23:31:49 +0000[diff] [blame]176 <li><a href="http://llvm.cs.uiuc.edu/PR522">[llvm-gcc] Crash on certain
177 C99 complex number routines</a></li>
Chris Lattner2a3cdf72005-02-27 19:31:02 +0000[diff] [blame]178 <li><a href="http://llvm.cs.uiuc.edu/PR529">[llvm-g++] Crash using placement
179 new on an array type</a></li>
Brian Gaekee77c8e72004-08-24 07:43:48 +0000[diff] [blame]180</ol>
181
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]182</div>
Reid Spencer8e0262f2004-05-23 17:23:13 +0000[diff] [blame]183
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]184<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]185<div class="doc_section">
186 <a name="portability">Portability and Supported Platforms</a>
187</div>
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]188<!-- *********************************************************************** -->
189
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]190<div class="doc_text">
191
John Criswell0b5b5e92004-12-08 20:35:47 +0000[diff] [blame]192<p>LLVM is known to work on the following platforms:</p>
Chris Lattner4654bdb2004-06-01 18:22:41 +0000[diff] [blame]193
194<ul>
195<li>Intel and AMD machines running Red Hat Linux and FreeBSD (and probably
196 other unix-like systems).</li>
197<li>Sun UltraSPARC workstations running Solaris 8.</li>
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame]198<li>Intel and AMD machines running on Win32 with the Cygwin libraries (limited
199 support is available for native builds with Visual C++).</li>
200<li>PowerPC-based Mac OS X systems, running 10.2 and above.</li>
Chris Lattner4654bdb2004-06-01 18:22:41 +0000[diff] [blame]201</ul>
202
Brian Gaekeb0fd7612004-05-09 05:28:35 +0000[diff] [blame]203<p>The core LLVM infrastructure uses
204<a href="http://www.gnu.org/software/autoconf/">GNU autoconf</a> to adapt itself
205to the machine and operating system on which it is built. However, minor
206porting may be required to get LLVM to work on new platforms. We welcome your
207portability patches and reports of successful builds or error messages.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]208
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]209</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]210
211<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]212<div class="doc_section">
213 <a name="knownproblems">Known Problems</a>
214</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]215<!-- *********************************************************************** -->
216
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]217<div class="doc_text">
218
219<p>This section contains all known problems with the LLVM system, listed by
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]220component. As new problems are discovered, they will be added to these
Chris Lattner5eccca42003-12-12 21:22:16 +0000[diff] [blame]221sections. If you run into a problem, please check the <a
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]222href="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]223there isn't already one.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]224
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]225</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]226
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]227<!-- ======================================================================= -->
228<div class="doc_subsection">
229 <a name="experimental">Experimental features included with this release</a>
230</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]231
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]232<div class="doc_text">
233
Misha Brukman6df9e2c2004-05-12 21:46:05 +0000[diff] [blame]234<p>The following components of this LLVM release are either untested, known to
235be broken or unreliable, or are in early development. These components should
236not be relied on, and bugs should not be filed against them, but they may be
237useful to some people. In particular, if you would like to work on one of these
238components, please contact us on the llvmdev list.</p>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]239
240<ul>
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame]241<li>The following passes are incomplete or buggy, and may be removed in future
Chris Lattner1fe848e2005-01-28 06:13:52 +0000[diff] [blame]242 releases: <tt>-cee, -branch-combine, -instloops, -paths, -pre</tt></li>
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame]243<li>The <tt>llvm-db</tt> tool is in a very early stage of development, but can
244 be used to step through programs and inspect the stack.</li>
Misha Brukman109d9e82005-03-30 19:14:24 +0000[diff] [blame]245<li>The "iterative scan" register allocator (enabled with
246 <tt>-regalloc=iterativescan</tt>) is not stable.</li>
Misha Brukman89976ff2005-03-18 00:48:56 +0000[diff] [blame]247<li>The SparcV8, Alpha, and IA64 ports are experimental.</li>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]248</ul>
249
250</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]251
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]252<!-- ======================================================================= -->
253<div class="doc_subsection">
254 <a name="core">Known problems with the LLVM Core</a>
255</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]256
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]257<div class="doc_text">
258
259<ul>
Misha Brukman109d9e82005-03-30 19:14:24 +0000[diff] [blame]260 <li>In the JIT, <tt>dlsym()</tt> on a symbol compiled by the JIT will not
261 work.</li>
Reid Spencer4f86f9c2004-11-25 22:38:30 +0000[diff] [blame]262 <li>The JIT does not use mutexes to protect its internal data structures. As
263 such, execution of a threaded program could cause these data structures to be
264 corrupted.
265 </li>
Reid Spencer4f86f9c2004-11-25 22:38:30 +0000[diff] [blame]266 <li><a href="http://llvm.cs.uiuc.edu/PR240">The lower-invoke pass does not
267 mark values live across a setjmp as volatile</a>. This missing feature
268 only affects targets whose setjmp/longjmp libraries do not save and restore
269 the entire register file.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]270</ul>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]271</div>
272
273<!-- ======================================================================= -->
274<div class="doc_subsection">
275 <a name="c-fe">Known problems with the C front-end</a>
276</div>
Chris Lattner47588f92003-10-02 05:07:23 +0000[diff] [blame]277
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]278<!-- _______________________________________________________________________ -->
Chris Lattnerb40efb32003-12-14 05:03:43 +0000[diff] [blame]279<div class="doc_subsubsection">Bugs</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]280
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]281<div class="doc_text">
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]282<ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]283<li>C99 Variable sized arrays do not release stack memory when they go out of
284 scope. Thus, the following program may run out of stack space:
285<pre>
286 for (i = 0; i != 1000000; ++i) {
287 int X[n];
288 foo(X);
289 }
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]290</pre></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]291
Misha Brukman6df9e2c2004-05-12 21:46:05 +0000[diff] [blame]292<li>Initialization of global union variables can only be done <a
Misha Brukman43ee2932004-12-04 00:45:09 +0000[diff] [blame]293href="http://llvm.cs.uiuc.edu/PR162">with the largest union member</a>.</li>
Chris Lattnerf580cdc2004-03-16 21:39:04 +0000[diff] [blame]294
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]295</ul>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]296</div>
297
298<!-- _______________________________________________________________________ -->
299<div class="doc_subsubsection">
300 Notes
301</div>
302
303<div class="doc_text">
304
305<ul>
306
307<li>Inline assembly is not yet supported.</li>
Chris Lattnere01fcfb2003-10-27 18:30:37 +0000[diff] [blame]308
309<li>"long double" is transformed by the front-end into "double". There is no
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]310support for floating point data types of any size other than 32 and 64
311bits.</li>
312
313<li>The following Unix system functionality has not been tested and may not
314work:
Misha Brukmane0c891c2003-11-22 01:00:11 +0000[diff] [blame]315 <ol>
316 <li><tt>sigsetjmp</tt>, <tt>siglongjmp</tt> - These are not turned into the
317 appropriate <tt>invoke</tt>/<tt>unwind</tt> instructions. Note that
318 <tt>setjmp</tt> and <tt>longjmp</tt> <em>are</em> compiled correctly.
319 <li><tt>getcontext</tt>, <tt>setcontext</tt>, <tt>makecontext</tt>
320 - These functions have not been tested.
321 </ol></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]322
323<li>Although many GCC extensions are supported, some are not. In particular,
324 the following extensions are known to <b>not be</b> supported:
325 <ol>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]326 <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]327 <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>
328 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Constructing-Calls.html#Constructing%20Calls">Constructing Calls</a>: Dispatching a call to another function.</li>
329 <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]330 <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]331 <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>
332 <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]333 <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>
334 <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>
Tanya Lattner014e5f52004-12-08 18:25:34 +0000[diff] [blame]335 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Thread_002dLocal.html">Thread-Local</a>: Per-thread variables.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]336 <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]337 </ol>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]338
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]339 <p>The following GCC extensions are <b>partially</b> supported. An ignored
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]340 attribute means that the LLVM compiler ignores the presence of the attribute,
341 but the code should still work. An unsupported attribute is one which is
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]342 ignored by the LLVM compiler and will cause a different interpretation of
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]343 the program.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]344
345 <ol>
346 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Length.html#Variable%20Length">Variable Length</a>:
347 Arrays whose length is computed at run time.<br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]348 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]349
350 <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]351
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]352 Declaring that functions have no side effects or that they can never
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]353 return.<br>
354
355 <b>Supported:</b> <tt>format</tt>, <tt>format_arg</tt>, <tt>non_null</tt>,
John Criswell0b5b5e92004-12-08 20:35:47 +0000[diff] [blame]356 <tt>noreturn</tt>, <tt>constructor</tt>, <tt>destructor</tt>,
357 <tt>unused</tt>,
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]358 <tt>deprecated</tt>, <tt>warn_unused_result</tt>, <tt>weak</tt><br>
359
John Criswell0b5b5e92004-12-08 20:35:47 +0000[diff] [blame]360 <b>Ignored:</b> <tt>noinline</tt>,
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]361 <tt>always_inline</tt>, <tt>pure</tt>, <tt>const</tt>, <tt>nothrow</tt>,
362 <tt>malloc</tt>, <tt>no_instrument_function</tt>, <tt>cdecl</tt><br>
363
364 <b>Unsupported:</b> <tt>used</tt>, <tt>section</tt>, <tt>alias</tt>,
365 <tt>visibility</tt>, <tt>regparm</tt>, <tt>stdcall</tt>,
366 <tt>fastcall</tt>, all other target specific attributes</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]367
368 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Attributes.html#Variable%20Attributes">Variable Attributes</a>:
369 Specifying attributes of variables.<br>
370 <b>Supported:</b> <tt>cleanup</tt>, <tt>common</tt>, <tt>nocommon</tt>,
371 <tt>deprecated</tt>, <tt>transparent_union</tt>,
372 <tt>unused</tt>, <tt>weak</tt><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]373
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]374 <b>Unsupported:</b> <tt>aligned</tt>, <tt>mode</tt>, <tt>packed</tt>,
375 <tt>section</tt>, <tt>shared</tt>, <tt>tls_model</tt>,
376 <tt>vector_size</tt>, <tt>dllimport</tt>,
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]377 <tt>dllexport</tt>, all target specific attributes.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]378
Misha Brukmanc4b7bee2003-12-12 04:37:31 +0000[diff] [blame]379 <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]380 <b>Supported:</b> <tt>transparent_union</tt>, <tt>unused</tt>,
Misha Brukmanc4b7bee2003-12-12 04:37:31 +0000[diff] [blame]381 <tt>deprecated</tt>, <tt>may_alias</tt><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]382
383 <b>Unsupported:</b> <tt>aligned</tt>, <tt>packed</tt>,
384 all target specific attributes.</li>
385
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]386 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html#Other%20Builtins">Other Builtins</a>:
387 Other built-in functions.<br>
388 We support all builtins which have a C language equivalent (e.g.,
389 <tt>__builtin_cos</tt>), <tt>__builtin_alloca</tt>,
390 <tt>__builtin_types_compatible_p</tt>, <tt>__builtin_choose_expr</tt>,
Chris Lattnerceebeb62004-06-18 06:26:29 +0000[diff] [blame]391 <tt>__builtin_constant_p</tt>, and <tt>__builtin_expect</tt>
392 (currently ignored). We also support builtins for ISO C99 floating
Chris Lattnerd03b3bc2005-03-11 06:16:26 +0000[diff] [blame]393 point comparison macros (e.g., <tt>__builtin_islessequal</tt>), and
394 <tt>__builtin_prefetch</tt>.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]395 </ol>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]396
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]397 <p>The following extensions <b>are</b> known to be supported:</p>
398
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]399 <ol>
Chris Lattner7fe97dd2004-03-16 08:54:07 +0000[diff] [blame]400 <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]401 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html#Statement%20Exprs">Statement Exprs</a>: Putting statements and declarations inside expressions.</li>
402 <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]403 <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]404 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Conditionals.html#Conditionals">Conditionals</a>: Omitting the middle operand of a <code>?:</code> expression.</li>
405 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Long-Long.html#Long%20Long">Long Long</a>: Double-word integers.</li>
406 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Complex.html#Complex">Complex</a>: Data types for complex numbers.</li>
407 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Hex-Floats.html#Hex%20Floats">Hex Floats</a>:Hexadecimal floating-point constants.</li>
408 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html#Zero%20Length">Zero Length</a>: Zero-length arrays.</li>
409 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Empty-Structures.html#Empty%20Structures">Empty Structures</a>: Structures with no members.</li>
410 <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>
411 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Escaped-Newlines.html#Escaped%20Newlines">Escaped Newlines</a>: Slightly looser rules for escaped newlines.</li>
412 <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]413 <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]414 <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]415 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Compound-Literals.html#Compound%20Literals">Compound Literals</a>: Compound literals give structures, unions,
416or arrays as values.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]417 <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]418 <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]419 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Case-Ranges.html#Case%20Ranges">Case Ranges</a>: `case 1 ... 9' and such.</li>
420 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Mixed-Declarations.html#Mixed%20Declarations">Mixed Declarations</a>: Mixing declarations and code.</li>
421 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Function-Prototypes.html#Function%20Prototypes">Function Prototypes</a>: Prototype declarations and old-style definitions.</li>
Tanya Lattner78537e42004-12-08 18:29:38 +0000[diff] [blame]422 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/C_002b_002b-Comments.html#C_002b_002b-Comments">C++ Comments</a>: C++ comments are recognized.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]423 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Dollar-Signs.html#Dollar%20Signs">Dollar Signs</a>: Dollar sign is allowed in identifiers.</li>
424 <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>
425 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Alignment.html#Alignment">Alignment</a>: Inquiring about the alignment of a type or variable.</li>
426 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Inline.html#Inline">Inline</a>: Defining inline functions (as fast as macros).</li>
427 <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>
428 <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>
429 <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]430 <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]431 <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>
432 <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]433 </ol></li>
434
435</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]436
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]437<p>If you run into GCC extensions which have not been included in any of these
438lists, please let us know (also including whether or not they work).</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]439
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]440</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]441
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]442<!-- ======================================================================= -->
443<div class="doc_subsection">
444 <a name="c++-fe">Known problems with the C++ front-end</a>
445</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]446
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]447<div class="doc_text">
448
Reid Spencere09ca642004-12-07 08:39:08 +0000[diff] [blame]449<p>For this release, the C++ front-end is considered to be fully
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame]450tested and works for a number of non-trivial programs, including LLVM
451itself.</p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]452
453</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]454
455<!-- _______________________________________________________________________ -->
Chris Lattner3a51be12004-02-14 04:12:41 +0000[diff] [blame]456<div class="doc_subsubsection">Bugs</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]457
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]458<div class="doc_text">
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]459
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]460<ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]461<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]462 front-end</a>.</li>
Chris Lattner7962f712004-07-17 02:04:41 +0000[diff] [blame]463
Chris Lattnerd5713882004-08-02 20:28:44 +0000[diff] [blame]464<li><b>IA-64 specific</b>: The C++ front-end does not use <a
465href="http://llvm.cs.uiuc.edu/PR406">IA64 ABI compliant layout of v-tables</a>.
Chris Lattner7962f712004-07-17 02:04:41 +0000[diff] [blame]466In particular, it just stores function pointers instead of function
467descriptors in the vtable. This bug prevents mixing C++ code compiled with
Chris Lattner04db8082004-08-02 20:29:51 +0000[diff] [blame]468LLVM with C++ objects compiled by other C++ compilers.</li>
Chris Lattner7962f712004-07-17 02:04:41 +0000[diff] [blame]469
Chris Lattnerd5713882004-08-02 20:28:44 +0000[diff] [blame]470</ul>
471
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]472</div>
473
474<!-- _______________________________________________________________________ -->
475<div class="doc_subsubsection">
476 Notes
477</div>
478
479<div class="doc_text">
480
481<ul>
Chris Lattnere01fcfb2003-10-27 18:30:37 +0000[diff] [blame]482
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]483<li>The C++ front-end is based on a pre-release of the GCC 3.4 C++ parser. This
484parser is significantly more standards compliant (and picky) than prior GCC
485versions. For more information, see the C++ section of the <a
Chris Lattner9e848092003-12-12 04:25:33 +0000[diff] [blame]486href="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]487
488<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]489 performed. In particular, destructors for objects in the <tt>longjmp</tt>ing
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]490 function and in the <tt>setjmp</tt> receiver function may not be run.
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]491 Objects in intervening stack frames will be destroyed, however (which is
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]492 better than most compilers).</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]493
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]494<li>The LLVM C++ front-end follows the <a
495 href="http://www.codesourcery.com/cxx-abi">Itanium C++ ABI</a>.
496 This document, which is not Itanium specific, specifies a standard for name
497 mangling, class layout, v-table layout, RTTI formats, and other C++
498 representation issues. Because we use this API, code generated by the LLVM
499 compilers should be binary compatible with machine code generated by other
500 Itanium ABI C++ compilers (such as G++, the Intel and HP compilers, etc).
501 <i>However</i>, the exception handling mechanism used by LLVM is very
502 different from the model used in the Itanium ABI, so <b>exceptions will not
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]503 interact correctly</b>. </li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]504
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]505</ul>
Chris Lattnerfcc54b32003-10-07 22:14:37 +0000[diff] [blame]506
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]507</div>
508
509<!-- ======================================================================= -->
510<div class="doc_subsection">
511 <a name="x86-be">Known problems with the X86 back-end</a>
512</div>
513
514<div class="doc_text">
515
516<ul>
Chris Lattnerd5713882004-08-02 20:28:44 +0000[diff] [blame]517 <li>none yet</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]518</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]519
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]520</div>
521
522<!-- ======================================================================= -->
523<div class="doc_subsection">
Misha Brukmanadb1c392004-07-12 16:55:41 +0000[diff] [blame]524 <a name="sparcv9-be">Known problems with the SparcV9 back-end</a>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]525</div>
526
527<div class="doc_text">
528
529<ul>
Misha Brukmanadb1c392004-07-12 16:55:41 +0000[diff] [blame]530<li><a href="http://llvm.cs.uiuc.edu/PR60">[sparcv9] SparcV9 backend miscompiles
531several programs in the LLVM test suite</a></li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]532</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]533
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]534</div>
535
536<!-- ======================================================================= -->
537<div class="doc_subsection">
Chris Lattnerf32a5f52004-11-07 01:55:32 +0000[diff] [blame]538 <a name="ppc-be">Known problems with the PowerPC back-end</a>
539</div>
540
541<div class="doc_text">
542
543<ul>
544<li>none yet</li>
545</ul>
546
547</div>
548
549<!-- ======================================================================= -->
550<div class="doc_subsection">
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]551 <a name="c-be">Known problems with the C back-end</a>
552</div>
553
554<div class="doc_text">
555
556<ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]557
558<li>The C back-end produces code that violates the ANSI C Type-Based Alias
559Analysis rules. As such, special options may be necessary to compile the code
560(for example, GCC requires the <tt>-fno-strict-aliasing</tt> option). This
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]561problem probably cannot be fixed.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]562
Chris Lattner2855ecd2003-11-04 20:06:53 +0000[diff] [blame]563<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]564supported</a>. This should not affect LLVM produced by the C or C++
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]565frontends.</li>
Chris Lattner2af46052003-10-24 04:03:19 +0000[diff] [blame]566
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]567</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]568
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]569</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]570
571<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]572<div class="doc_section">
573 <a name="additionalinfo">Additional Information</a>
574</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]575<!-- *********************************************************************** -->
576
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]577<div class="doc_text">
578
579<p>A wide variety of additional information is available on the LLVM web page,
Misha Brukman109d9e82005-03-30 19:14:24 +0000[diff] [blame]580including <a href="http://llvm.cs.uiuc.edu/docs/#maillist">mailing lists</a> and
581<a href="http://llvm.cs.uiuc.edu/pubs/">publications describing algorithms and
582components implemented in LLVM</a>. The web page also contains versions of the
583API documentation which is up-to-date with the CVS version of the source code.
584You can access versions of these documents specific to this release by going
585into the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]586
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]587<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]588us via the <a href="http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev">mailing
589lists</a>.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]590
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]591</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]592
593<!-- *********************************************************************** -->
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]594
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]595<hr>
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]596<address>
Misha Brukman38847d52003-12-21 22:53:21 +0000[diff] [blame]597 <a href="http://jigsaw.w3.org/css-validator/check/referer"><img
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]598 src="http://jigsaw.w3.org/css-validator/images/vcss" alt="Valid CSS!"></a>
599 <a href="http://validator.w3.org/check/referer"><img
600 src="http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01!" /></a>
601
Misha Brukmane0c891c2003-11-22 01:00:11 +0000[diff] [blame]602 <a href="http://llvm.cs.uiuc.edu">The LLVM Compiler Infrastructure</a><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]603 Last modified: $Date$
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]604</address>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]605
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]606</body>
607</html>