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gerrit-public.fairphone.software / toolchain / llvm-project / 385a47394a7d1426b7bd655740539ec1fe639c58 / . / llvm / docs / ReleaseNotes.html
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4<head>
Reid Spencere4190fa2004-11-18 18:38:58 +0000[diff] [blame]5 <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]6 <link rel="stylesheet" href="llvm.css" type="text/css">
Chris Lattnerf3a7c242004-12-09 22:22:58 +0000[diff] [blame]7 <title>LLVM 1.5 Release Notes</title>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]8</head>
9<body>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]10
Chris Lattnerf3a7c242004-12-09 22:22:58 +0000[diff] [blame]11<div class="doc_title">LLVM 1.5 Release Notes</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]12
13<ol>
Misha Brukman80731b92003-11-22 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 Lattner77a51732004-04-30 22:17:12 +0000[diff] [blame]16 <li><a href="GettingStarted.html">Installation Instructions</a></li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]17 <li><a href="#portability">Portability and Supported Platforms</a></li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]18 <li><a href="#knownproblems">Known Problems</a>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]19 <li><a href="#additionalinfo">Additional Information</a></li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]20</ol>
21
Chris Lattner020e1fc2004-05-23 21:07:27 +0000[diff] [blame]22<div class="doc_author">
Chris Lattnerf3a7c242004-12-09 22:22:58 +0000[diff] [blame]23 <p>Written by the <a href="http://llvm.cs.uiuc.edu">LLVM Team</a><p>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]24</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]25
26<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]27<div class="doc_section">
28 <a name="intro">Introduction</a>
29</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]30<!-- *********************************************************************** -->
31
Misha Brukman80731b92003-11-22 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 Lattnerf3a7c242004-12-09 22:22:58 +0000[diff] [blame]35infrastructure, release 1.5. Here we describe the status of LLVM, including any
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]36known problems and improvements from the previous release. The most up-to-date
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]37version of this document can be found on the <a
Chris Lattnerf3a7c242004-12-09 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 Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]39not reading this on the LLVM web pages, you should probably go there because
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]40this document may be updated after the release.</p>
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]41
Chris Lattnerb5bb5972004-12-07 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 Lattnere7525b52003-10-07 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 Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]46list</a> is a good place to send them.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]47
Chris Lattnerf3a7c242004-12-09 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 Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]51href="http://llvm.cs.uiuc.edu/releases/">releases page</a>.</p>
52
53</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]54
55<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]56<div class="doc_section">
57 <a name="whatsnew">What's New?</a>
58</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]59<!-- *********************************************************************** -->
60
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]61<div class="doc_text">
62
Chris Lattnerf3a7c242004-12-09 22:22:58 +0000[diff] [blame]63<p>This is the sixth public release of the LLVM compiler infrastructure.</p>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]64
Chris Lattner7c0241c2004-12-10 16:27:34 +0000[diff] [blame]65<p> At this time, LLVM is known to correctly compile a broad range of C and
Chris Lattnerf3a7c242004-12-09 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 Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]68
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]69</div>
70
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]71<!--=========================================================================-->
72<div class="doc_subsubsection">
Chris Lattner8ebf2532004-02-25 16:36:51 +0000[diff] [blame]73<a name="newfeatures">This release implements the following new features:</a>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]74</div>
Chris Lattnere7525b52003-10-07 21:38:31 +0000[diff] [blame]75
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]76<div class="doc_text">
Chris Lattnere7525b52003-10-07 21:38:31 +0000[diff] [blame]77<ol>
Chris Lattner7bf2e542004-12-11 06:10:52 +0000[diff] [blame]78 <li>LLVM now includes an <a href="http://llvm.cs.uiuc.edu/PR415">
Chris Lattner64d9d2b2005-01-22 18:45:35 +0000[diff] [blame]79 Interprocedural Sparse Conditional Constant Propagation</a> pass, named
Chris Lattner7bf2e542004-12-11 06:10:52 +0000[diff] [blame]80 -ipsccp, which is run by default at link-time.</li>
Chris Lattnerf87e05b2005-02-01 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 Lattnere14babd2005-02-13 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 Lattnerbe895ed2005-02-14 22:58:38 +0000[diff] [blame]86 href="GettingStartedVS.html">now documented</a>.</li>
Chris Lattner592db402003-11-19 22:05:38 +0000[diff] [blame]87</ol>
Chris Lattner4491de62003-11-08 04:28:55 +0000[diff] [blame]88
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]89</div>
90
Chris Lattnerba7bd472003-12-06 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 Lattner4491de62003-11-08 04:28:55 +0000[diff] [blame]96
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]97<div class="doc_text">
98
Chris Lattner4491de62003-11-08 04:28:55 +0000[diff] [blame]99<ol>
Chris Lattnerf3a7c242004-12-09 22:22:58 +0000[diff] [blame]100 <li></li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]101</ol>
Chris Lattnere7525b52003-10-07 21:38:31 +0000[diff] [blame]102
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]103</div>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]104
105<!--=========================================================================-->
106<div class="doc_subsubsection">
Misha Brukman017f2f32004-04-19 02:56:49 +0000[diff] [blame]107<a name="qualityofimp">In this release, the following Quality of Implementation
108issues were fixed:</a>
Chris Lattner4df78f02003-12-20 03:42:11 +0000[diff] [blame]109</div>
110
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]111<div class="doc_text">
112
Chris Lattner4df78f02003-12-20 03:42:11 +0000[diff] [blame]113<ol>
Chris Lattner64d9d2b2005-01-22 18:45:35 +0000[diff] [blame]114 <li><a href="http://llvm.cs.uiuc.edu/PR448">Building LLVM in optimized mode
115 should no longer cause GCC to hit swap in the PowerPC backend.</a></li>
Brian Gaeke8b05e4f2004-01-16 21:55:04 +0000[diff] [blame]116</ol>
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]117</div>
Brian Gaeke8b05e4f2004-01-16 21:55:04 +0000[diff] [blame]118
119<!--=========================================================================-->
120<div class="doc_subsubsection">
Chris Lattner2ad48782004-05-02 04:19:15 +0000[diff] [blame]121<a name="codequality">This release includes the following Code Quality
122improvements:</a>
Chris Lattner23257062004-05-23 20:42:08 +0000[diff] [blame]123</div>
Chris Lattner639579c2003-10-27 17:06:39 +0000[diff] [blame]124
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]125<div class="doc_text">
Chris Lattner639579c2003-10-27 17:06:39 +0000[diff] [blame]126<ol>
Chris Lattnerf3a7c242004-12-09 22:22:58 +0000[diff] [blame]127 <li></li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]128</ol>
Reid Spencer3e58f582004-05-23 17:23:13 +0000[diff] [blame]129</div>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]130
131<!--=========================================================================-->
132<div class="doc_subsubsection">
Misha Brukman017f2f32004-04-19 02:56:49 +0000[diff] [blame]133<a name="bugfix">In this release, the following bugs in the previous release
134were fixed:</a>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]135</div>
136
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]137<div class="doc_text">
138
Chris Lattnere7525b52003-10-07 21:38:31 +0000[diff] [blame]139
Chris Lattner1c75b252005-02-14 16:57:55 +0000[diff] [blame]140<p>Bugs fixed in the LLVM Core:</p>
Chris Lattnere7525b52003-10-07 21:38:31 +0000[diff] [blame]141<ol>
Chris Lattnerb5c253a2004-12-29 04:39:50 +0000[diff] [blame]142 <li><a href="http://llvm.cs.uiuc.edu/PR491">[dse] DSE deletes stores that
143 are partially overwritten by smaller stores</a></li>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]144</ol>
145
Chris Lattner1c75b252005-02-14 16:57:55 +0000[diff] [blame]146<p>Code Generator Bugs:</p>
147<ol>
148 <li><a href="http://llvm.cs.uiuc.edu/PR490">[cbackend] Logical constant
149 expressions (and/or/xor) not implemented</a></li>
150 <li><a href="http://llvm.cs.uiuc.edu/PR511">[cbackend] C backend does not
151 respect 'volatile'</a></li>
152</ol>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]153
Chris Lattner1c75b252005-02-14 16:57:55 +0000[diff] [blame]154<p>Bugs in the C/C++ front-end:</p>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]155<ol>
Chris Lattnere1329f42005-01-03 04:20:21 +0000[diff] [blame]156 <li><a href="http://llvm.cs.uiuc.edu/PR487">[llvmgcc] llvm-gcc incorrectly
157 rejects some constant initializers involving the addresses of array
158 elements</a></li>
Chris Lattner2a38aea2005-02-11 19:29:52 +0000[diff] [blame]159 <li><a href="http://llvm.cs.uiuc.edu/PR501">[llvm-g++] Crash compiling
160 anonymous union</a></li>
Chris Lattner1c75b252005-02-14 16:57:55 +0000[diff] [blame]161 <li><a href="http://llvm.cs.uiuc.edu/PR509">[llvm-g++] Do not use dynamic
162 initialization where static init will do</a></li>
Chris Lattner1f031b22005-02-15 05:28:06 +0000[diff] [blame]163 <li><a href="http://llvm.cs.uiuc.edu/PR510">[llvmgcc] Field offset
164 miscalculated for some structure fields following bit fields</a></li>
Chris Lattner385a4732005-02-15 07:02:12 +0000[diff] [blame^]165 <li><a href="http://llvm.cs.uiuc.edu/PR513">[llvm-g++] Temporary lifetimes
166 incorrect for short circuit logical operations</a></li>
Brian Gaeke730d8d62004-08-24 07:43:48 +0000[diff] [blame]167</ol>
168
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]169</div>
Reid Spencer3e58f582004-05-23 17:23:13 +0000[diff] [blame]170
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]171<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]172<div class="doc_section">
173 <a name="portability">Portability and Supported Platforms</a>
174</div>
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]175<!-- *********************************************************************** -->
176
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]177<div class="doc_text">
178
John Criswell64307722004-12-08 20:35:47 +0000[diff] [blame]179<p>LLVM is known to work on the following platforms:</p>
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]180
181<ul>
182<li>Intel and AMD machines running Red Hat Linux and FreeBSD (and probably
183 other unix-like systems).</li>
184<li>Sun UltraSPARC workstations running Solaris 8.</li>
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]185<li>Intel and AMD machines running on Win32 with the Cygwin libraries (limited
186 support is available for native builds with Visual C++).</li>
187<li>PowerPC-based Mac OS X systems, running 10.2 and above.</li>
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]188</ul>
189
Brian Gaekee3e557e2004-05-09 05:28:35 +0000[diff] [blame]190<p>The core LLVM infrastructure uses
191<a href="http://www.gnu.org/software/autoconf/">GNU autoconf</a> to adapt itself
192to the machine and operating system on which it is built. However, minor
193porting may be required to get LLVM to work on new platforms. We welcome your
194portability patches and reports of successful builds or error messages.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]195
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]196</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]197
198<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]199<div class="doc_section">
200 <a name="knownproblems">Known Problems</a>
201</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]202<!-- *********************************************************************** -->
203
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]204<div class="doc_text">
205
206<p>This section contains all known problems with the LLVM system, listed by
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]207component. As new problems are discovered, they will be added to these
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]208sections. If you run into a problem, please check the <a
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]209href="http://llvm.cs.uiuc.edu/bugs/">LLVM bug database</a> and submit a bug if
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]210there isn't already one.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]211
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]212</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]213
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]214<!-- ======================================================================= -->
215<div class="doc_subsection">
216 <a name="experimental">Experimental features included with this release</a>
217</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]218
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]219<div class="doc_text">
220
Misha Brukmanfa50a222004-05-12 21:46:05 +0000[diff] [blame]221<p>The following components of this LLVM release are either untested, known to
222be broken or unreliable, or are in early development. These components should
223not be relied on, and bugs should not be filed against them, but they may be
224useful to some people. In particular, if you would like to work on one of these
225components, please contact us on the llvmdev list.</p>
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]226
227<ul>
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]228<li>The following passes are incomplete or buggy, and may be removed in future
Chris Lattner38389b12005-01-28 06:13:52 +0000[diff] [blame]229 releases: <tt>-cee, -branch-combine, -instloops, -paths, -pre</tt></li>
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]230<li>The <tt>llvm-db</tt> tool is in a very early stage of development, but can
231 be used to step through programs and inspect the stack.</li>
Chris Lattnerfa835102004-12-02 17:20:17 +0000[diff] [blame]232<li>The "iterative scan" register allocator (enabled with -regalloc=iterativescan)
233 is not stable.</li>
Chris Lattnere14babd2005-02-13 22:27:24 +0000[diff] [blame]234<li>The SparcV8 and Alpha ports are experimental.</li>
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]235</ul>
236
237</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]238
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]239<!-- ======================================================================= -->
240<div class="doc_subsection">
241 <a name="core">Known problems with the LLVM Core</a>
242</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]243
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]244<div class="doc_text">
245
246<ul>
Reid Spencer493d9c22004-11-25 22:38:30 +0000[diff] [blame]247 <li>In the JIT, <tt>dlsym</tt> on a symbol compiled by the JIT will not work.
248 </li>
249 <li>The JIT does not use mutexes to protect its internal data structures. As
250 such, execution of a threaded program could cause these data structures to be
251 corrupted.
252 </li>
Reid Spencer493d9c22004-11-25 22:38:30 +0000[diff] [blame]253 <li><a href="http://llvm.cs.uiuc.edu/PR240">The lower-invoke pass does not
254 mark values live across a setjmp as volatile</a>. This missing feature
255 only affects targets whose setjmp/longjmp libraries do not save and restore
256 the entire register file.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]257</ul>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]258</div>
259
260<!-- ======================================================================= -->
261<div class="doc_subsection">
262 <a name="c-fe">Known problems with the C front-end</a>
263</div>
Chris Lattner178f3db2003-10-02 05:07:23 +0000[diff] [blame]264
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]265<!-- _______________________________________________________________________ -->
Chris Lattner5a8a7282003-12-14 05:03:43 +0000[diff] [blame]266<div class="doc_subsubsection">Bugs</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]267
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]268<div class="doc_text">
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]269<ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]270<li>C99 Variable sized arrays do not release stack memory when they go out of
271 scope. Thus, the following program may run out of stack space:
272<pre>
273 for (i = 0; i != 1000000; ++i) {
274 int X[n];
275 foo(X);
276 }
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]277</pre></li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]278
Misha Brukmanfa50a222004-05-12 21:46:05 +0000[diff] [blame]279<li>Initialization of global union variables can only be done <a
Misha Brukman68ef9a92004-12-04 00:45:09 +0000[diff] [blame]280href="http://llvm.cs.uiuc.edu/PR162">with the largest union member</a>.</li>
Chris Lattner1ab58dd2004-03-16 21:39:04 +0000[diff] [blame]281
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]282</ul>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]283</div>
284
285<!-- _______________________________________________________________________ -->
286<div class="doc_subsubsection">
287 Notes
288</div>
289
290<div class="doc_text">
291
292<ul>
293
294<li>Inline assembly is not yet supported.</li>
Chris Lattnerd2a74272003-10-27 18:30:37 +0000[diff] [blame]295
296<li>"long double" is transformed by the front-end into "double". There is no
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]297support for floating point data types of any size other than 32 and 64
298bits.</li>
299
300<li>The following Unix system functionality has not been tested and may not
301work:
Misha Brukman7cb4e382003-11-22 01:00:11 +0000[diff] [blame]302 <ol>
303 <li><tt>sigsetjmp</tt>, <tt>siglongjmp</tt> - These are not turned into the
304 appropriate <tt>invoke</tt>/<tt>unwind</tt> instructions. Note that
305 <tt>setjmp</tt> and <tt>longjmp</tt> <em>are</em> compiled correctly.
306 <li><tt>getcontext</tt>, <tt>setcontext</tt>, <tt>makecontext</tt>
307 - These functions have not been tested.
308 </ol></li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]309
310<li>Although many GCC extensions are supported, some are not. In particular,
311 the following extensions are known to <b>not be</b> supported:
312 <ol>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]313 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Local-Labels.html#Local%20Labels">Local Labels</a>: Labels local to a block.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]314 <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>
315 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Constructing-Calls.html#Constructing%20Calls">Constructing Calls</a>: Dispatching a call to another function.</li>
316 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Extended-Asm.html#Extended%20Asm">Extended Asm</a>: Assembler instructions with C expressions as operands.</li>
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]317 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Constraints.html#Constraints">Constraints</a>: Constraints for asm operands.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]318 <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>
319 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Explicit-Reg-Vars.html#Explicit%20Reg%20Vars">Explicit Reg Vars</a>: Defining variables residing in specified registers.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]320 <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>
321 <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 Lattner63371342004-12-08 18:25:34 +0000[diff] [blame]322 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Thread_002dLocal.html">Thread-Local</a>: Per-thread variables.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]323 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Pragmas.html#Pragmas">Pragmas</a>: Pragmas accepted by GCC.</li>
Misha Brukman7cb4e382003-11-22 01:00:11 +0000[diff] [blame]324 </ol>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]325
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]326 <p>The following GCC extensions are <b>partially</b> supported. An ignored
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]327 attribute means that the LLVM compiler ignores the presence of the attribute,
328 but the code should still work. An unsupported attribute is one which is
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]329 ignored by the LLVM compiler and will cause a different interpretation of
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]330 the program.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]331
332 <ol>
333 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Length.html#Variable%20Length">Variable Length</a>:
334 Arrays whose length is computed at run time.<br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]335 Supported, but allocated stack space is not freed until the function returns (noted above).</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]336
337 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html#Function%20Attributes">Function Attributes</a>:
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]338
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]339 Declaring that functions have no side effects or that they can never
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]340 return.<br>
341
342 <b>Supported:</b> <tt>format</tt>, <tt>format_arg</tt>, <tt>non_null</tt>,
John Criswell64307722004-12-08 20:35:47 +0000[diff] [blame]343 <tt>noreturn</tt>, <tt>constructor</tt>, <tt>destructor</tt>,
344 <tt>unused</tt>,
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]345 <tt>deprecated</tt>, <tt>warn_unused_result</tt>, <tt>weak</tt><br>
346
John Criswell64307722004-12-08 20:35:47 +0000[diff] [blame]347 <b>Ignored:</b> <tt>noinline</tt>,
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]348 <tt>always_inline</tt>, <tt>pure</tt>, <tt>const</tt>, <tt>nothrow</tt>,
349 <tt>malloc</tt>, <tt>no_instrument_function</tt>, <tt>cdecl</tt><br>
350
351 <b>Unsupported:</b> <tt>used</tt>, <tt>section</tt>, <tt>alias</tt>,
352 <tt>visibility</tt>, <tt>regparm</tt>, <tt>stdcall</tt>,
353 <tt>fastcall</tt>, all other target specific attributes</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]354
355 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Attributes.html#Variable%20Attributes">Variable Attributes</a>:
356 Specifying attributes of variables.<br>
357 <b>Supported:</b> <tt>cleanup</tt>, <tt>common</tt>, <tt>nocommon</tt>,
358 <tt>deprecated</tt>, <tt>transparent_union</tt>,
359 <tt>unused</tt>, <tt>weak</tt><br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]360
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]361 <b>Unsupported:</b> <tt>aligned</tt>, <tt>mode</tt>, <tt>packed</tt>,
362 <tt>section</tt>, <tt>shared</tt>, <tt>tls_model</tt>,
363 <tt>vector_size</tt>, <tt>dllimport</tt>,
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]364 <tt>dllexport</tt>, all target specific attributes.</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]365
Misha Brukman8395d732003-12-12 04:37:31 +0000[diff] [blame]366 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Type-Attributes.html#Type%20Attributes">Type Attributes</a>: Specifying attributes of types.<br>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]367 <b>Supported:</b> <tt>transparent_union</tt>, <tt>unused</tt>,
Misha Brukman8395d732003-12-12 04:37:31 +0000[diff] [blame]368 <tt>deprecated</tt>, <tt>may_alias</tt><br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]369
370 <b>Unsupported:</b> <tt>aligned</tt>, <tt>packed</tt>,
371 all target specific attributes.</li>
372
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]373 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html#Other%20Builtins">Other Builtins</a>:
374 Other built-in functions.<br>
375 We support all builtins which have a C language equivalent (e.g.,
376 <tt>__builtin_cos</tt>), <tt>__builtin_alloca</tt>,
377 <tt>__builtin_types_compatible_p</tt>, <tt>__builtin_choose_expr</tt>,
Chris Lattnerb7c4bac2004-06-18 06:26:29 +0000[diff] [blame]378 <tt>__builtin_constant_p</tt>, and <tt>__builtin_expect</tt>
379 (currently ignored). We also support builtins for ISO C99 floating
380 point comparison macros (e.g., <tt>__builtin_islessequal</tt>).</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]381 </ol>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]382
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]383 <p>The following extensions <b>are</b> known to be supported:</p>
384
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]385 <ol>
Chris Lattnerd3dc8502004-03-16 08:54:07 +0000[diff] [blame]386 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Labels-as-Values.html#Labels%20as%20Values">Labels as Values</a>: Getting pointers to labels and computed gotos.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]387 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html#Statement%20Exprs">Statement Exprs</a>: Putting statements and declarations inside expressions.</li>
388 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Typeof.html#Typeof">Typeof</a>: <code>typeof</code>: referring to the type of an expression.</li>
Tanya Lattnerce33a1b2004-06-22 03:48:17 +0000[diff] [blame]389 <li><a href="http://gcc.gnu.org/onlinedocs/gcc-3.4.0/gcc/Lvalues.html#Lvalues">Lvalues</a>: Using <code>?:</code>, "<code>,</code>" and casts in lvalues.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]390 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Conditionals.html#Conditionals">Conditionals</a>: Omitting the middle operand of a <code>?:</code> expression.</li>
391 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Long-Long.html#Long%20Long">Long Long</a>: Double-word integers.</li>
392 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Complex.html#Complex">Complex</a>: Data types for complex numbers.</li>
393 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Hex-Floats.html#Hex%20Floats">Hex Floats</a>:Hexadecimal floating-point constants.</li>
394 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html#Zero%20Length">Zero Length</a>: Zero-length arrays.</li>
395 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Empty-Structures.html#Empty%20Structures">Empty Structures</a>: Structures with no members.</li>
396 <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>
397 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Escaped-Newlines.html#Escaped%20Newlines">Escaped Newlines</a>: Slightly looser rules for escaped newlines.</li>
398 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Subscripting.html#Subscripting">Subscripting</a>: Any array can be subscripted, even if not an lvalue.</li>
Misha Brukman8395d732003-12-12 04:37:31 +0000[diff] [blame]399 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Pointer-Arith.html#Pointer%20Arith">Pointer Arith</a>: Arithmetic on <code>void</code>-pointers and function pointers.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]400 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Initializers.html#Initializers">Initializers</a>: Non-constant initializers.</li>
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]401 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Compound-Literals.html#Compound%20Literals">Compound Literals</a>: Compound literals give structures, unions,
402or arrays as values.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]403 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Designated-Inits.html#Designated%20Inits">Designated Inits</a>: Labeling elements of initializers.</li>
Misha Brukman8395d732003-12-12 04:37:31 +0000[diff] [blame]404 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Cast-to-Union.html#Cast%20to%20Union">Cast to Union</a>: Casting to union type from any member of the union.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]405 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Case-Ranges.html#Case%20Ranges">Case Ranges</a>: `case 1 ... 9' and such.</li>
406 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Mixed-Declarations.html#Mixed%20Declarations">Mixed Declarations</a>: Mixing declarations and code.</li>
407 <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 Lattner7591b822004-12-08 18:29:38 +0000[diff] [blame]408 <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 Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]409 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Dollar-Signs.html#Dollar%20Signs">Dollar Signs</a>: Dollar sign is allowed in identifiers.</li>
410 <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>
411 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Alignment.html#Alignment">Alignment</a>: Inquiring about the alignment of a type or variable.</li>
412 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Inline.html#Inline">Inline</a>: Defining inline functions (as fast as macros).</li>
413 <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>
414 <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>
415 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Function-Names.html#Function%20Names">Function Names</a>: Printable strings which are the name of the current function.</li>
Chris Lattner3646dad2004-02-14 04:08:29 +0000[diff] [blame]416 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Return-Address.html#Return%20Address">Return Address</a>: Getting the return or frame address of a function.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]417 <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>
418 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Attribute-Syntax.html#Attribute%20Syntax">Attribute Syntax</a>: Formal syntax for attributes.</li>
Misha Brukman7cb4e382003-11-22 01:00:11 +0000[diff] [blame]419 </ol></li>
420
421</ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]422
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]423<p>If you run into GCC extensions which have not been included in any of these
424lists, please let us know (also including whether or not they work).</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]425
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]426</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]427
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]428<!-- ======================================================================= -->
429<div class="doc_subsection">
430 <a name="c++-fe">Known problems with the C++ front-end</a>
431</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]432
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]433<div class="doc_text">
434
Reid Spencer55684c32004-12-07 08:39:08 +0000[diff] [blame]435<p>For this release, the C++ front-end is considered to be fully
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]436tested and works for a number of non-trivial programs, including LLVM
437itself.</p>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]438
439</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]440
441<!-- _______________________________________________________________________ -->
Chris Lattner141ebb62004-02-14 04:12:41 +0000[diff] [blame]442<div class="doc_subsubsection">Bugs</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]443
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]444<div class="doc_text">
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]445
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]446<ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]447<li>The C++ front-end inherits all problems afflicting the <a href="#c-fe">C
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]448 front-end</a>.</li>
Chris Lattner041e6c92004-07-17 02:04:41 +0000[diff] [blame]449
Chris Lattner5cd40922004-08-02 20:28:44 +0000[diff] [blame]450<li><b>IA-64 specific</b>: The C++ front-end does not use <a
451href="http://llvm.cs.uiuc.edu/PR406">IA64 ABI compliant layout of v-tables</a>.
Chris Lattner041e6c92004-07-17 02:04:41 +0000[diff] [blame]452In particular, it just stores function pointers instead of function
453descriptors in the vtable. This bug prevents mixing C++ code compiled with
Chris Lattner2fd93492004-08-02 20:29:51 +0000[diff] [blame]454LLVM with C++ objects compiled by other C++ compilers.</li>
Chris Lattner041e6c92004-07-17 02:04:41 +0000[diff] [blame]455
Chris Lattner5cd40922004-08-02 20:28:44 +0000[diff] [blame]456</ul>
457
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]458</div>
459
460<!-- _______________________________________________________________________ -->
461<div class="doc_subsubsection">
462 Notes
463</div>
464
465<div class="doc_text">
466
467<ul>
Chris Lattnerd2a74272003-10-27 18:30:37 +0000[diff] [blame]468
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]469<li>The C++ front-end is based on a pre-release of the GCC 3.4 C++ parser. This
470parser is significantly more standards compliant (and picky) than prior GCC
471versions. For more information, see the C++ section of the <a
Chris Lattnere76e9ab2003-12-12 04:25:33 +0000[diff] [blame]472href="http://gcc.gnu.org/gcc-3.4/changes.html">GCC 3.4 release notes</a>.</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]473
474<li>Destructors for local objects are not always run when a <tt>longjmp</tt> is
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]475 performed. In particular, destructors for objects in the <tt>longjmp</tt>ing
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]476 function and in the <tt>setjmp</tt> receiver function may not be run.
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]477 Objects in intervening stack frames will be destroyed, however (which is
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]478 better than most compilers).</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]479
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]480<li>The LLVM C++ front-end follows the <a
481 href="http://www.codesourcery.com/cxx-abi">Itanium C++ ABI</a>.
482 This document, which is not Itanium specific, specifies a standard for name
483 mangling, class layout, v-table layout, RTTI formats, and other C++
484 representation issues. Because we use this API, code generated by the LLVM
485 compilers should be binary compatible with machine code generated by other
486 Itanium ABI C++ compilers (such as G++, the Intel and HP compilers, etc).
487 <i>However</i>, the exception handling mechanism used by LLVM is very
488 different from the model used in the Itanium ABI, so <b>exceptions will not
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]489 interact correctly</b>. </li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]490
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]491</ul>
Chris Lattner46ecf612003-10-07 22:14:37 +0000[diff] [blame]492
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]493</div>
494
495<!-- ======================================================================= -->
496<div class="doc_subsection">
497 <a name="x86-be">Known problems with the X86 back-end</a>
498</div>
499
500<div class="doc_text">
501
502<ul>
Chris Lattner5cd40922004-08-02 20:28:44 +0000[diff] [blame]503 <li>none yet</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]504</ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]505
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]506</div>
507
508<!-- ======================================================================= -->
509<div class="doc_subsection">
Misha Brukmana516e992004-07-12 16:55:41 +0000[diff] [blame]510 <a name="sparcv9-be">Known problems with the SparcV9 back-end</a>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]511</div>
512
513<div class="doc_text">
514
515<ul>
Misha Brukmana516e992004-07-12 16:55:41 +0000[diff] [blame]516<li><a href="http://llvm.cs.uiuc.edu/PR60">[sparcv9] SparcV9 backend miscompiles
517several programs in the LLVM test suite</a></li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]518</ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]519
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]520</div>
521
522<!-- ======================================================================= -->
523<div class="doc_subsection">
Chris Lattnerdf925ce2004-11-07 01:55:32 +0000[diff] [blame]524 <a name="ppc-be">Known problems with the PowerPC back-end</a>
525</div>
526
527<div class="doc_text">
528
529<ul>
530<li>none yet</li>
531</ul>
532
533</div>
534
535<!-- ======================================================================= -->
536<div class="doc_subsection">
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]537 <a name="c-be">Known problems with the C back-end</a>
538</div>
539
540<div class="doc_text">
541
542<ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]543
544<li>The C back-end produces code that violates the ANSI C Type-Based Alias
545Analysis rules. As such, special options may be necessary to compile the code
546(for example, GCC requires the <tt>-fno-strict-aliasing</tt> option). This
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]547problem probably cannot be fixed.</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]548
Chris Lattnerc679fbb2003-11-04 20:06:53 +0000[diff] [blame]549<li><a href="http://llvm.cs.uiuc.edu/PR56">Zero arg vararg functions are not
Chris Lattnerb28c3282003-10-24 04:03:19 +0000[diff] [blame]550supported</a>. This should not affect LLVM produced by the C or C++
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]551frontends.</li>
Chris Lattnerb28c3282003-10-24 04:03:19 +0000[diff] [blame]552
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]553</ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]554
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]555</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]556
557<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]558<div class="doc_section">
559 <a name="additionalinfo">Additional Information</a>
560</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]561<!-- *********************************************************************** -->
562
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]563<div class="doc_text">
564
565<p>A wide variety of additional information is available on the LLVM web page,
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]566including mailing lists and publications describing algorithms and components
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]567implemented in LLVM. The web page also contains versions of the API
568documentation which is up-to-date with the CVS version of the source code. You
569can access versions of these documents specific to this release by going into
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]570the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]571
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]572<p>If you have any questions or comments about LLVM, please feel free to contact
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]573us via the <a href="http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev">mailing
574lists</a>.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]575
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]576</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]577
578<!-- *********************************************************************** -->
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]579
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]580<hr>
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]581<address>
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586
Misha Brukman7cb4e382003-11-22 01:00:11 +0000[diff] [blame]587 <a href="http://llvm.cs.uiuc.edu">The LLVM Compiler Infrastructure</a><br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]588 Last modified: $Date$
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]589</address>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]590
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]591</body>
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