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gerrit-public.fairphone.software / fp2-dev / platform / external / llvm / d7934542c60d28bbe29c7f625f917ed14a23ef79 / . / 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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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>
83 <li>LLVM includes new experimental native code generators for SparcV8 and
84 Alpha.</li>
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>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]102</ol>
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]103
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]104</div>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]105
106<!--=========================================================================-->
107<div class="doc_subsubsection">
Misha Brukmana7aadf12004-04-19 02:56:49 +0000[diff] [blame]108<a name="qualityofimp">In this release, the following Quality of Implementation
109issues were fixed:</a>
Chris Lattnere29ac162003-12-20 03:42:11 +0000[diff] [blame]110</div>
111
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]112<div class="doc_text">
113
Chris Lattnere29ac162003-12-20 03:42:11 +0000[diff] [blame]114<ol>
Chris Lattnerda1f03c2005-01-22 18:45:35 +0000[diff] [blame]115 <li><a href="http://llvm.cs.uiuc.edu/PR448">Building LLVM in optimized mode
116 should no longer cause GCC to hit swap in the PowerPC backend.</a></li>
Brian Gaeke6b31beb2004-01-16 21:55:04 +0000[diff] [blame]117</ol>
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]118</div>
Brian Gaeke6b31beb2004-01-16 21:55:04 +0000[diff] [blame]119
120<!--=========================================================================-->
121<div class="doc_subsubsection">
Chris Lattner6e1ef192004-05-02 04:19:15 +0000[diff] [blame]122<a name="codequality">This release includes the following Code Quality
123improvements:</a>
Chris Lattneraab56d42004-05-23 20:42:08 +0000[diff] [blame]124</div>
Chris Lattner89ca2b82003-10-27 17:06:39 +0000[diff] [blame]125
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]126<div class="doc_text">
Chris Lattner89ca2b82003-10-27 17:06:39 +0000[diff] [blame]127<ol>
Chris Lattner78bf32b2004-12-09 22:22:58 +0000[diff] [blame]128 <li></li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]129</ol>
Reid Spencer8e0262f2004-05-23 17:23:13 +0000[diff] [blame]130</div>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]131
132<!--=========================================================================-->
133<div class="doc_subsubsection">
Misha Brukmana7aadf12004-04-19 02:56:49 +0000[diff] [blame]134<a name="bugfix">In this release, the following bugs in the previous release
135were fixed:</a>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]136</div>
137
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]138<div class="doc_text">
139
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]140
Chris Lattnerf54e9cb2005-02-14 16:57:55 +0000[diff] [blame]141<p>Bugs fixed in the LLVM Core:</p>
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]142<ol>
Chris Lattnerbfd24682004-12-29 04:39:50 +0000[diff] [blame]143 <li><a href="http://llvm.cs.uiuc.edu/PR491">[dse] DSE deletes stores that
144 are partially overwritten by smaller stores</a></li>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]145</ol>
146
Chris Lattnerf54e9cb2005-02-14 16:57:55 +0000[diff] [blame]147<p>Code Generator Bugs:</p>
148<ol>
149 <li><a href="http://llvm.cs.uiuc.edu/PR490">[cbackend] Logical constant
150 expressions (and/or/xor) not implemented</a></li>
151 <li><a href="http://llvm.cs.uiuc.edu/PR511">[cbackend] C backend does not
152 respect 'volatile'</a></li>
153</ol>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]154
Chris Lattnerf54e9cb2005-02-14 16:57:55 +0000[diff] [blame]155<p>Bugs in the C/C++ front-end:</p>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]156<ol>
Chris Lattner8de9f232005-01-03 04:20:21 +0000[diff] [blame]157 <li><a href="http://llvm.cs.uiuc.edu/PR487">[llvmgcc] llvm-gcc incorrectly
158 rejects some constant initializers involving the addresses of array
159 elements</a></li>
Chris Lattnerf832f6a2005-02-11 19:29:52 +0000[diff] [blame]160 <li><a href="http://llvm.cs.uiuc.edu/PR501">[llvm-g++] Crash compiling
161 anonymous union</a></li>
Chris Lattnerf54e9cb2005-02-14 16:57:55 +0000[diff] [blame]162 <li><a href="http://llvm.cs.uiuc.edu/PR509">[llvm-g++] Do not use dynamic
163 initialization where static init will do</a></li>
Chris Lattner4a9dc292005-02-15 05:28:06 +0000[diff] [blame]164 <li><a href="http://llvm.cs.uiuc.edu/PR510">[llvmgcc] Field offset
165 miscalculated for some structure fields following bit fields</a></li>
Chris Lattner5ad907a2005-02-15 07:02:12 +0000[diff] [blame]166 <li><a href="http://llvm.cs.uiuc.edu/PR513">[llvm-g++] Temporary lifetimes
167 incorrect for short circuit logical operations</a></li>
Chris Lattnerc1f90a92005-02-19 07:29:25 +0000[diff] [blame]168 <li><a href="http://llvm.cs.uiuc.edu/PR517">[llvm-gcc] Crash compiling
169 bitfield &lt;-&gt; aggregate assignment</a></li>
Chris Lattner94f6ac72005-02-19 17:13:20 +0000[diff] [blame]170 <li><a href="http://llvm.cs.uiuc.edu/PR520">[llvm-g++] Error compiling
Chris Lattnerd12b9b22005-02-19 17:17:32 +0000[diff] [blame]171 virtual function thunk with an unnamed argument</a></li>
Chris Lattner290d2292005-02-20 23:31:49 +0000[diff] [blame]172 <li><a href="http://llvm.cs.uiuc.edu/PR522">[llvm-gcc] Crash on certain
173 C99 complex number routines</a></li>
Chris Lattner2a3cdf72005-02-27 19:31:02 +0000[diff] [blame]174 <li><a href="http://llvm.cs.uiuc.edu/PR529">[llvm-g++] Crash using placement
175 new on an array type</a></li>
Brian Gaekee77c8e72004-08-24 07:43:48 +0000[diff] [blame]176</ol>
177
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]178</div>
Reid Spencer8e0262f2004-05-23 17:23:13 +0000[diff] [blame]179
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]180<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]181<div class="doc_section">
182 <a name="portability">Portability and Supported Platforms</a>
183</div>
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]184<!-- *********************************************************************** -->
185
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]186<div class="doc_text">
187
John Criswell0b5b5e92004-12-08 20:35:47 +0000[diff] [blame]188<p>LLVM is known to work on the following platforms:</p>
Chris Lattner4654bdb2004-06-01 18:22:41 +0000[diff] [blame]189
190<ul>
191<li>Intel and AMD machines running Red Hat Linux and FreeBSD (and probably
192 other unix-like systems).</li>
193<li>Sun UltraSPARC workstations running Solaris 8.</li>
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame]194<li>Intel and AMD machines running on Win32 with the Cygwin libraries (limited
195 support is available for native builds with Visual C++).</li>
196<li>PowerPC-based Mac OS X systems, running 10.2 and above.</li>
Chris Lattner4654bdb2004-06-01 18:22:41 +0000[diff] [blame]197</ul>
198
Brian Gaekeb0fd7612004-05-09 05:28:35 +0000[diff] [blame]199<p>The core LLVM infrastructure uses
200<a href="http://www.gnu.org/software/autoconf/">GNU autoconf</a> to adapt itself
201to the machine and operating system on which it is built. However, minor
202porting may be required to get LLVM to work on new platforms. We welcome your
203portability patches and reports of successful builds or error messages.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]204
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]205</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]206
207<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]208<div class="doc_section">
209 <a name="knownproblems">Known Problems</a>
210</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]211<!-- *********************************************************************** -->
212
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]213<div class="doc_text">
214
215<p>This section contains all known problems with the LLVM system, listed by
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]216component. As new problems are discovered, they will be added to these
Chris Lattner5eccca42003-12-12 21:22:16 +0000[diff] [blame]217sections. If you run into a problem, please check the <a
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]218href="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]219there isn't already one.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]220
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]221</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]222
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]223<!-- ======================================================================= -->
224<div class="doc_subsection">
225 <a name="experimental">Experimental features included with this release</a>
226</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]227
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]228<div class="doc_text">
229
Misha Brukman6df9e2c2004-05-12 21:46:05 +0000[diff] [blame]230<p>The following components of this LLVM release are either untested, known to
231be broken or unreliable, or are in early development. These components should
232not be relied on, and bugs should not be filed against them, but they may be
233useful to some people. In particular, if you would like to work on one of these
234components, please contact us on the llvmdev list.</p>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]235
236<ul>
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame]237<li>The following passes are incomplete or buggy, and may be removed in future
Chris Lattner1fe848e2005-01-28 06:13:52 +0000[diff] [blame]238 releases: <tt>-cee, -branch-combine, -instloops, -paths, -pre</tt></li>
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame]239<li>The <tt>llvm-db</tt> tool is in a very early stage of development, but can
240 be used to step through programs and inspect the stack.</li>
Chris Lattner0da7f492004-12-02 17:20:17 +0000[diff] [blame]241<li>The "iterative scan" register allocator (enabled with -regalloc=iterativescan)
242 is not stable.</li>
Chris Lattner2e12c742005-02-13 22:27:24 +0000[diff] [blame]243<li>The SparcV8 and Alpha ports are experimental.</li>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]244</ul>
245
246</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]247
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]248<!-- ======================================================================= -->
249<div class="doc_subsection">
250 <a name="core">Known problems with the LLVM Core</a>
251</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]252
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]253<div class="doc_text">
254
255<ul>
Reid Spencer4f86f9c2004-11-25 22:38:30 +0000[diff] [blame]256 <li>In the JIT, <tt>dlsym</tt> on a symbol compiled by the JIT will not work.
257 </li>
258 <li>The JIT does not use mutexes to protect its internal data structures. As
259 such, execution of a threaded program could cause these data structures to be
260 corrupted.
261 </li>
Reid Spencer4f86f9c2004-11-25 22:38:30 +0000[diff] [blame]262 <li><a href="http://llvm.cs.uiuc.edu/PR240">The lower-invoke pass does not
263 mark values live across a setjmp as volatile</a>. This missing feature
264 only affects targets whose setjmp/longjmp libraries do not save and restore
265 the entire register file.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]266</ul>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]267</div>
268
269<!-- ======================================================================= -->
270<div class="doc_subsection">
271 <a name="c-fe">Known problems with the C front-end</a>
272</div>
Chris Lattner47588f92003-10-02 05:07:23 +0000[diff] [blame]273
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]274<!-- _______________________________________________________________________ -->
Chris Lattnerb40efb32003-12-14 05:03:43 +0000[diff] [blame]275<div class="doc_subsubsection">Bugs</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]276
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]277<div class="doc_text">
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]278<ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]279<li>C99 Variable sized arrays do not release stack memory when they go out of
280 scope. Thus, the following program may run out of stack space:
281<pre>
282 for (i = 0; i != 1000000; ++i) {
283 int X[n];
284 foo(X);
285 }
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]286</pre></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]287
Misha Brukman6df9e2c2004-05-12 21:46:05 +0000[diff] [blame]288<li>Initialization of global union variables can only be done <a
Misha Brukman43ee2932004-12-04 00:45:09 +0000[diff] [blame]289href="http://llvm.cs.uiuc.edu/PR162">with the largest union member</a>.</li>
Chris Lattnerf580cdc2004-03-16 21:39:04 +0000[diff] [blame]290
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]291</ul>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]292</div>
293
294<!-- _______________________________________________________________________ -->
295<div class="doc_subsubsection">
296 Notes
297</div>
298
299<div class="doc_text">
300
301<ul>
302
303<li>Inline assembly is not yet supported.</li>
Chris Lattnere01fcfb2003-10-27 18:30:37 +0000[diff] [blame]304
305<li>"long double" is transformed by the front-end into "double". There is no
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]306support for floating point data types of any size other than 32 and 64
307bits.</li>
308
309<li>The following Unix system functionality has not been tested and may not
310work:
Misha Brukmane0c891c2003-11-22 01:00:11 +0000[diff] [blame]311 <ol>
312 <li><tt>sigsetjmp</tt>, <tt>siglongjmp</tt> - These are not turned into the
313 appropriate <tt>invoke</tt>/<tt>unwind</tt> instructions. Note that
314 <tt>setjmp</tt> and <tt>longjmp</tt> <em>are</em> compiled correctly.
315 <li><tt>getcontext</tt>, <tt>setcontext</tt>, <tt>makecontext</tt>
316 - These functions have not been tested.
317 </ol></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]318
319<li>Although many GCC extensions are supported, some are not. In particular,
320 the following extensions are known to <b>not be</b> supported:
321 <ol>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]322 <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]323 <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>
324 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Constructing-Calls.html#Constructing%20Calls">Constructing Calls</a>: Dispatching a call to another function.</li>
325 <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]326 <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]327 <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>
328 <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]329 <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>
330 <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]331 <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]332 <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]333 </ol>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]334
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]335 <p>The following GCC extensions are <b>partially</b> supported. An ignored
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]336 attribute means that the LLVM compiler ignores the presence of the attribute,
337 but the code should still work. An unsupported attribute is one which is
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]338 ignored by the LLVM compiler and will cause a different interpretation of
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]339 the program.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]340
341 <ol>
342 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Length.html#Variable%20Length">Variable Length</a>:
343 Arrays whose length is computed at run time.<br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]344 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]345
346 <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]347
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]348 Declaring that functions have no side effects or that they can never
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]349 return.<br>
350
351 <b>Supported:</b> <tt>format</tt>, <tt>format_arg</tt>, <tt>non_null</tt>,
John Criswell0b5b5e92004-12-08 20:35:47 +0000[diff] [blame]352 <tt>noreturn</tt>, <tt>constructor</tt>, <tt>destructor</tt>,
353 <tt>unused</tt>,
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]354 <tt>deprecated</tt>, <tt>warn_unused_result</tt>, <tt>weak</tt><br>
355
John Criswell0b5b5e92004-12-08 20:35:47 +0000[diff] [blame]356 <b>Ignored:</b> <tt>noinline</tt>,
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]357 <tt>always_inline</tt>, <tt>pure</tt>, <tt>const</tt>, <tt>nothrow</tt>,
358 <tt>malloc</tt>, <tt>no_instrument_function</tt>, <tt>cdecl</tt><br>
359
360 <b>Unsupported:</b> <tt>used</tt>, <tt>section</tt>, <tt>alias</tt>,
361 <tt>visibility</tt>, <tt>regparm</tt>, <tt>stdcall</tt>,
362 <tt>fastcall</tt>, all other target specific attributes</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]363
364 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Attributes.html#Variable%20Attributes">Variable Attributes</a>:
365 Specifying attributes of variables.<br>
366 <b>Supported:</b> <tt>cleanup</tt>, <tt>common</tt>, <tt>nocommon</tt>,
367 <tt>deprecated</tt>, <tt>transparent_union</tt>,
368 <tt>unused</tt>, <tt>weak</tt><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]369
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]370 <b>Unsupported:</b> <tt>aligned</tt>, <tt>mode</tt>, <tt>packed</tt>,
371 <tt>section</tt>, <tt>shared</tt>, <tt>tls_model</tt>,
372 <tt>vector_size</tt>, <tt>dllimport</tt>,
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]373 <tt>dllexport</tt>, all target specific attributes.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]374
Misha Brukmanc4b7bee2003-12-12 04:37:31 +0000[diff] [blame]375 <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]376 <b>Supported:</b> <tt>transparent_union</tt>, <tt>unused</tt>,
Misha Brukmanc4b7bee2003-12-12 04:37:31 +0000[diff] [blame]377 <tt>deprecated</tt>, <tt>may_alias</tt><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]378
379 <b>Unsupported:</b> <tt>aligned</tt>, <tt>packed</tt>,
380 all target specific attributes.</li>
381
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]382 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html#Other%20Builtins">Other Builtins</a>:
383 Other built-in functions.<br>
384 We support all builtins which have a C language equivalent (e.g.,
385 <tt>__builtin_cos</tt>), <tt>__builtin_alloca</tt>,
386 <tt>__builtin_types_compatible_p</tt>, <tt>__builtin_choose_expr</tt>,
Chris Lattnerceebeb62004-06-18 06:26:29 +0000[diff] [blame]387 <tt>__builtin_constant_p</tt>, and <tt>__builtin_expect</tt>
388 (currently ignored). We also support builtins for ISO C99 floating
389 point comparison macros (e.g., <tt>__builtin_islessequal</tt>).</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]390 </ol>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]391
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]392 <p>The following extensions <b>are</b> known to be supported:</p>
393
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]394 <ol>
Chris Lattner7fe97dd2004-03-16 08:54:07 +0000[diff] [blame]395 <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]396 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html#Statement%20Exprs">Statement Exprs</a>: Putting statements and declarations inside expressions.</li>
397 <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]398 <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]399 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Conditionals.html#Conditionals">Conditionals</a>: Omitting the middle operand of a <code>?:</code> expression.</li>
400 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Long-Long.html#Long%20Long">Long Long</a>: Double-word integers.</li>
401 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Complex.html#Complex">Complex</a>: Data types for complex numbers.</li>
402 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Hex-Floats.html#Hex%20Floats">Hex Floats</a>:Hexadecimal floating-point constants.</li>
403 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html#Zero%20Length">Zero Length</a>: Zero-length arrays.</li>
404 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Empty-Structures.html#Empty%20Structures">Empty Structures</a>: Structures with no members.</li>
405 <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>
406 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Escaped-Newlines.html#Escaped%20Newlines">Escaped Newlines</a>: Slightly looser rules for escaped newlines.</li>
407 <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]408 <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]409 <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]410 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Compound-Literals.html#Compound%20Literals">Compound Literals</a>: Compound literals give structures, unions,
411or arrays as values.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]412 <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]413 <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]414 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Case-Ranges.html#Case%20Ranges">Case Ranges</a>: `case 1 ... 9' and such.</li>
415 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Mixed-Declarations.html#Mixed%20Declarations">Mixed Declarations</a>: Mixing declarations and code.</li>
416 <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]417 <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]418 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Dollar-Signs.html#Dollar%20Signs">Dollar Signs</a>: Dollar sign is allowed in identifiers.</li>
419 <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>
420 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Alignment.html#Alignment">Alignment</a>: Inquiring about the alignment of a type or variable.</li>
421 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Inline.html#Inline">Inline</a>: Defining inline functions (as fast as macros).</li>
422 <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>
423 <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>
424 <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]425 <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]426 <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>
427 <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]428 </ol></li>
429
430</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]431
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]432<p>If you run into GCC extensions which have not been included in any of these
433lists, please let us know (also including whether or not they work).</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]434
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]435</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]436
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]437<!-- ======================================================================= -->
438<div class="doc_subsection">
439 <a name="c++-fe">Known problems with the C++ front-end</a>
440</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]441
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]442<div class="doc_text">
443
Reid Spencere09ca642004-12-07 08:39:08 +0000[diff] [blame]444<p>For this release, the C++ front-end is considered to be fully
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame]445tested and works for a number of non-trivial programs, including LLVM
446itself.</p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]447
448</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]449
450<!-- _______________________________________________________________________ -->
Chris Lattner3a51be12004-02-14 04:12:41 +0000[diff] [blame]451<div class="doc_subsubsection">Bugs</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]452
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]453<div class="doc_text">
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]454
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]455<ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]456<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]457 front-end</a>.</li>
Chris Lattner7962f712004-07-17 02:04:41 +0000[diff] [blame]458
Chris Lattnerd5713882004-08-02 20:28:44 +0000[diff] [blame]459<li><b>IA-64 specific</b>: The C++ front-end does not use <a
460href="http://llvm.cs.uiuc.edu/PR406">IA64 ABI compliant layout of v-tables</a>.
Chris Lattner7962f712004-07-17 02:04:41 +0000[diff] [blame]461In particular, it just stores function pointers instead of function
462descriptors in the vtable. This bug prevents mixing C++ code compiled with
Chris Lattner04db8082004-08-02 20:29:51 +0000[diff] [blame]463LLVM with C++ objects compiled by other C++ compilers.</li>
Chris Lattner7962f712004-07-17 02:04:41 +0000[diff] [blame]464
Chris Lattnerd5713882004-08-02 20:28:44 +0000[diff] [blame]465</ul>
466
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]467</div>
468
469<!-- _______________________________________________________________________ -->
470<div class="doc_subsubsection">
471 Notes
472</div>
473
474<div class="doc_text">
475
476<ul>
Chris Lattnere01fcfb2003-10-27 18:30:37 +0000[diff] [blame]477
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]478<li>The C++ front-end is based on a pre-release of the GCC 3.4 C++ parser. This
479parser is significantly more standards compliant (and picky) than prior GCC
480versions. For more information, see the C++ section of the <a
Chris Lattner9e848092003-12-12 04:25:33 +0000[diff] [blame]481href="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]482
483<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]484 performed. In particular, destructors for objects in the <tt>longjmp</tt>ing
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]485 function and in the <tt>setjmp</tt> receiver function may not be run.
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]486 Objects in intervening stack frames will be destroyed, however (which is
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]487 better than most compilers).</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]488
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]489<li>The LLVM C++ front-end follows the <a
490 href="http://www.codesourcery.com/cxx-abi">Itanium C++ ABI</a>.
491 This document, which is not Itanium specific, specifies a standard for name
492 mangling, class layout, v-table layout, RTTI formats, and other C++
493 representation issues. Because we use this API, code generated by the LLVM
494 compilers should be binary compatible with machine code generated by other
495 Itanium ABI C++ compilers (such as G++, the Intel and HP compilers, etc).
496 <i>However</i>, the exception handling mechanism used by LLVM is very
497 different from the model used in the Itanium ABI, so <b>exceptions will not
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]498 interact correctly</b>. </li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]499
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]500</ul>
Chris Lattnerfcc54b32003-10-07 22:14:37 +0000[diff] [blame]501
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]502</div>
503
504<!-- ======================================================================= -->
505<div class="doc_subsection">
506 <a name="x86-be">Known problems with the X86 back-end</a>
507</div>
508
509<div class="doc_text">
510
511<ul>
Chris Lattnerd5713882004-08-02 20:28:44 +0000[diff] [blame]512 <li>none yet</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]513</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]514
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]515</div>
516
517<!-- ======================================================================= -->
518<div class="doc_subsection">
Misha Brukmanadb1c392004-07-12 16:55:41 +0000[diff] [blame]519 <a name="sparcv9-be">Known problems with the SparcV9 back-end</a>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]520</div>
521
522<div class="doc_text">
523
524<ul>
Misha Brukmanadb1c392004-07-12 16:55:41 +0000[diff] [blame]525<li><a href="http://llvm.cs.uiuc.edu/PR60">[sparcv9] SparcV9 backend miscompiles
526several programs in the LLVM test suite</a></li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]527</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]528
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]529</div>
530
531<!-- ======================================================================= -->
532<div class="doc_subsection">
Chris Lattnerf32a5f52004-11-07 01:55:32 +0000[diff] [blame]533 <a name="ppc-be">Known problems with the PowerPC back-end</a>
534</div>
535
536<div class="doc_text">
537
538<ul>
539<li>none yet</li>
540</ul>
541
542</div>
543
544<!-- ======================================================================= -->
545<div class="doc_subsection">
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]546 <a name="c-be">Known problems with the C back-end</a>
547</div>
548
549<div class="doc_text">
550
551<ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]552
553<li>The C back-end produces code that violates the ANSI C Type-Based Alias
554Analysis rules. As such, special options may be necessary to compile the code
555(for example, GCC requires the <tt>-fno-strict-aliasing</tt> option). This
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]556problem probably cannot be fixed.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]557
Chris Lattner2855ecd2003-11-04 20:06:53 +0000[diff] [blame]558<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]559supported</a>. This should not affect LLVM produced by the C or C++
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]560frontends.</li>
Chris Lattner2af46052003-10-24 04:03:19 +0000[diff] [blame]561
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]562</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]563
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]564</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]565
566<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]567<div class="doc_section">
568 <a name="additionalinfo">Additional Information</a>
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_text">
573
574<p>A wide variety of additional information is available on the LLVM web page,
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]575including mailing lists and publications describing algorithms and components
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]576implemented in LLVM. The web page also contains versions of the API
577documentation which is up-to-date with the CVS version of the source code. You
578can access versions of these documents specific to this release by going into
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]579the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]580
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]581<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]582us via the <a href="http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev">mailing
583lists</a>.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]584
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]585</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]586
587<!-- *********************************************************************** -->
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]588
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]589<hr>
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]590<address>
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595
Misha Brukmane0c891c2003-11-22 01:00:11 +0000[diff] [blame]596 <a href="http://llvm.cs.uiuc.edu">The LLVM Compiler Infrastructure</a><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]597 Last modified: $Date$
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]598</address>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]599
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]600</body>
601</html>