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gerrit-public.fairphone.software / toolchain / llvm-project / 51efcefa4953b06922874488d60d9116703812b3 / . / llvm / docs / ReleaseNotes.html
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Misha Brukman80731b92003-11-22 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 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>
Misha Brukmanf12594d2005-03-18 00:48:56 +0000[diff] [blame]83 <li>LLVM includes new experimental native code generators for SparcV8,
84 Alpha, and IA64.</li>
Chris Lattnere14babd2005-02-13 22:27:24 +0000[diff] [blame]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>
Reid Spencer51efcef2005-04-22 20:27:33 +0000[diff] [blame^]87 <li>Configuring LLVM to build targets selectively is now implemented, via the
88 <tt>--enable-targets=</tt> option. This feature is documented
89 <a href="GettingStarted.html#config">here</a>.</li>
Chris Lattner592db402003-11-19 22:05:38 +0000[diff] [blame]90</ol>
Chris Lattner4491de62003-11-08 04:28:55 +0000[diff] [blame]91
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]92</div>
93
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]94
95<!--=========================================================================-->
96<div class="doc_subsubsection">
97In this release, the following missing features were implemented:
98</div>
Chris Lattner4491de62003-11-08 04:28:55 +0000[diff] [blame]99
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]100<div class="doc_text">
101
Chris Lattner4491de62003-11-08 04:28:55 +0000[diff] [blame]102<ol>
Chris Lattner81c1dd22005-02-28 16:52:28 +0000[diff] [blame]103 <li>LLVM can now create native shared libraries with '<tt>llvm-gcc ...
104 -shared -Wl,-native</tt>' (or with <tt>-Wl,-native-cbe</tt>).</li>
Chris Lattnerdb302f82005-03-11 06:16:26 +0000[diff] [blame]105 <li>LLVM now supports a new "<a href="LangRef.html#i_prefetch">llvm.prefetch
106 </a>" intrinsic, and llvm-gcc now supports __builtin_prefetch.
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]107</ol>
Chris Lattnere7525b52003-10-07 21:38:31 +0000[diff] [blame]108
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]109</div>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]110
111<!--=========================================================================-->
112<div class="doc_subsubsection">
Misha Brukman017f2f32004-04-19 02:56:49 +0000[diff] [blame]113<a name="qualityofimp">In this release, the following Quality of Implementation
114issues were fixed:</a>
Chris Lattner4df78f02003-12-20 03:42:11 +0000[diff] [blame]115</div>
116
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]117<div class="doc_text">
118
Chris Lattner4df78f02003-12-20 03:42:11 +0000[diff] [blame]119<ol>
Chris Lattner64d9d2b2005-01-22 18:45:35 +0000[diff] [blame]120 <li><a href="http://llvm.cs.uiuc.edu/PR448">Building LLVM in optimized mode
121 should no longer cause GCC to hit swap in the PowerPC backend.</a></li>
Brian Gaeke8b05e4f2004-01-16 21:55:04 +0000[diff] [blame]122</ol>
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]123</div>
Brian Gaeke8b05e4f2004-01-16 21:55:04 +0000[diff] [blame]124
125<!--=========================================================================-->
126<div class="doc_subsubsection">
Chris Lattner2ad48782004-05-02 04:19:15 +0000[diff] [blame]127<a name="codequality">This release includes the following Code Quality
128improvements:</a>
Chris Lattner23257062004-05-23 20:42:08 +0000[diff] [blame]129</div>
Chris Lattner639579c2003-10-27 17:06:39 +0000[diff] [blame]130
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]131<div class="doc_text">
Chris Lattner639579c2003-10-27 17:06:39 +0000[diff] [blame]132<ol>
Chris Lattnerf3a7c242004-12-09 22:22:58 +0000[diff] [blame]133 <li></li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]134</ol>
Reid Spencer3e58f582004-05-23 17:23:13 +0000[diff] [blame]135</div>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]136
137<!--=========================================================================-->
138<div class="doc_subsubsection">
Misha Brukman017f2f32004-04-19 02:56:49 +0000[diff] [blame]139<a name="bugfix">In this release, the following bugs in the previous release
140were fixed:</a>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]141</div>
142
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]143<div class="doc_text">
144
Chris Lattnere7525b52003-10-07 21:38:31 +0000[diff] [blame]145
Chris Lattner1c75b252005-02-14 16:57:55 +0000[diff] [blame]146<p>Bugs fixed in the LLVM Core:</p>
Chris Lattnere7525b52003-10-07 21:38:31 +0000[diff] [blame]147<ol>
Chris Lattnerb5c253a2004-12-29 04:39:50 +0000[diff] [blame]148 <li><a href="http://llvm.cs.uiuc.edu/PR491">[dse] DSE deletes stores that
149 are partially overwritten by smaller stores</a></li>
Chris Lattner181c8182005-04-19 06:08:04 +0000[diff] [blame]150 <li><a href="http://llvm.cs.uiuc.edu/PR548">[instcombine] miscompilation of
151 setcc or setcc in one case</a></li>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]152</ol>
153
Chris Lattner1c75b252005-02-14 16:57:55 +0000[diff] [blame]154<p>Code Generator Bugs:</p>
155<ol>
156 <li><a href="http://llvm.cs.uiuc.edu/PR490">[cbackend] Logical constant
157 expressions (and/or/xor) not implemented</a></li>
158 <li><a href="http://llvm.cs.uiuc.edu/PR511">[cbackend] C backend does not
159 respect 'volatile'</a></li>
160</ol>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]161
Chris Lattner1c75b252005-02-14 16:57:55 +0000[diff] [blame]162<p>Bugs in the C/C++ front-end:</p>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]163<ol>
Chris Lattnere1329f42005-01-03 04:20:21 +0000[diff] [blame]164 <li><a href="http://llvm.cs.uiuc.edu/PR487">[llvmgcc] llvm-gcc incorrectly
165 rejects some constant initializers involving the addresses of array
166 elements</a></li>
Chris Lattner2a38aea2005-02-11 19:29:52 +0000[diff] [blame]167 <li><a href="http://llvm.cs.uiuc.edu/PR501">[llvm-g++] Crash compiling
168 anonymous union</a></li>
Chris Lattner1c75b252005-02-14 16:57:55 +0000[diff] [blame]169 <li><a href="http://llvm.cs.uiuc.edu/PR509">[llvm-g++] Do not use dynamic
170 initialization where static init will do</a></li>
Chris Lattner1f031b22005-02-15 05:28:06 +0000[diff] [blame]171 <li><a href="http://llvm.cs.uiuc.edu/PR510">[llvmgcc] Field offset
172 miscalculated for some structure fields following bit fields</a></li>
Chris Lattner385a4732005-02-15 07:02:12 +0000[diff] [blame]173 <li><a href="http://llvm.cs.uiuc.edu/PR513">[llvm-g++] Temporary lifetimes
174 incorrect for short circuit logical operations</a></li>
Chris Lattner48c23142005-02-19 07:29:25 +0000[diff] [blame]175 <li><a href="http://llvm.cs.uiuc.edu/PR517">[llvm-gcc] Crash compiling
176 bitfield &lt;-&gt; aggregate assignment</a></li>
Chris Lattner6a3ae642005-02-19 17:13:20 +0000[diff] [blame]177 <li><a href="http://llvm.cs.uiuc.edu/PR520">[llvm-g++] Error compiling
Chris Lattner3d6194f2005-02-19 17:17:32 +0000[diff] [blame]178 virtual function thunk with an unnamed argument</a></li>
Chris Lattner3a8f68e2005-02-20 23:31:49 +0000[diff] [blame]179 <li><a href="http://llvm.cs.uiuc.edu/PR522">[llvm-gcc] Crash on certain
180 C99 complex number routines</a></li>
Chris Lattnerc6e33802005-02-27 19:31:02 +0000[diff] [blame]181 <li><a href="http://llvm.cs.uiuc.edu/PR529">[llvm-g++] Crash using placement
182 new on an array type</a></li>
Brian Gaeke730d8d62004-08-24 07:43:48 +0000[diff] [blame]183</ol>
184
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]185</div>
Reid Spencer3e58f582004-05-23 17:23:13 +0000[diff] [blame]186
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]187<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]188<div class="doc_section">
189 <a name="portability">Portability and Supported Platforms</a>
190</div>
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]191<!-- *********************************************************************** -->
192
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]193<div class="doc_text">
194
John Criswell64307722004-12-08 20:35:47 +0000[diff] [blame]195<p>LLVM is known to work on the following platforms:</p>
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]196
197<ul>
198<li>Intel and AMD machines running Red Hat Linux and FreeBSD (and probably
199 other unix-like systems).</li>
200<li>Sun UltraSPARC workstations running Solaris 8.</li>
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]201<li>Intel and AMD machines running on Win32 with the Cygwin libraries (limited
202 support is available for native builds with Visual C++).</li>
203<li>PowerPC-based Mac OS X systems, running 10.2 and above.</li>
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]204</ul>
205
Brian Gaekee3e557e2004-05-09 05:28:35 +0000[diff] [blame]206<p>The core LLVM infrastructure uses
207<a href="http://www.gnu.org/software/autoconf/">GNU autoconf</a> to adapt itself
208to the machine and operating system on which it is built. However, minor
209porting may be required to get LLVM to work on new platforms. We welcome your
210portability patches and reports of successful builds or error messages.</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
214<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]215<div class="doc_section">
216 <a name="knownproblems">Known Problems</a>
217</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]218<!-- *********************************************************************** -->
219
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]220<div class="doc_text">
221
222<p>This section contains all known problems with the LLVM system, listed by
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]223component. As new problems are discovered, they will be added to these
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]224sections. If you run into a problem, please check the <a
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]225href="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]226there isn't already one.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]227
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]228</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]229
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]230<!-- ======================================================================= -->
231<div class="doc_subsection">
232 <a name="experimental">Experimental features included with this release</a>
233</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]234
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]235<div class="doc_text">
236
Misha Brukmanfa50a222004-05-12 21:46:05 +0000[diff] [blame]237<p>The following components of this LLVM release are either untested, known to
238be broken or unreliable, or are in early development. These components should
239not be relied on, and bugs should not be filed against them, but they may be
240useful to some people. In particular, if you would like to work on one of these
241components, please contact us on the llvmdev list.</p>
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]242
243<ul>
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]244<li>The following passes are incomplete or buggy, and may be removed in future
Chris Lattner38389b12005-01-28 06:13:52 +0000[diff] [blame]245 releases: <tt>-cee, -branch-combine, -instloops, -paths, -pre</tt></li>
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]246<li>The <tt>llvm-db</tt> tool is in a very early stage of development, but can
247 be used to step through programs and inspect the stack.</li>
Misha Brukman96158092005-03-30 19:14:24 +0000[diff] [blame]248<li>The "iterative scan" register allocator (enabled with
249 <tt>-regalloc=iterativescan</tt>) is not stable.</li>
Misha Brukmanf12594d2005-03-18 00:48:56 +0000[diff] [blame]250<li>The SparcV8, Alpha, and IA64 ports are experimental.</li>
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]251</ul>
252
253</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]254
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]255<!-- ======================================================================= -->
256<div class="doc_subsection">
257 <a name="core">Known problems with the LLVM Core</a>
258</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]259
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]260<div class="doc_text">
261
262<ul>
Misha Brukman96158092005-03-30 19:14:24 +0000[diff] [blame]263 <li>In the JIT, <tt>dlsym()</tt> on a symbol compiled by the JIT will not
264 work.</li>
Reid Spencer493d9c22004-11-25 22:38:30 +0000[diff] [blame]265 <li>The JIT does not use mutexes to protect its internal data structures. As
266 such, execution of a threaded program could cause these data structures to be
267 corrupted.
268 </li>
Reid Spencer493d9c22004-11-25 22:38:30 +0000[diff] [blame]269 <li><a href="http://llvm.cs.uiuc.edu/PR240">The lower-invoke pass does not
270 mark values live across a setjmp as volatile</a>. This missing feature
271 only affects targets whose setjmp/longjmp libraries do not save and restore
272 the entire register file.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]273</ul>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]274</div>
275
276<!-- ======================================================================= -->
277<div class="doc_subsection">
278 <a name="c-fe">Known problems with the C front-end</a>
279</div>
Chris Lattner178f3db2003-10-02 05:07:23 +0000[diff] [blame]280
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]281<!-- _______________________________________________________________________ -->
Chris Lattner5a8a7282003-12-14 05:03:43 +0000[diff] [blame]282<div class="doc_subsubsection">Bugs</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]283
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]284<div class="doc_text">
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]285<ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]286<li>C99 Variable sized arrays do not release stack memory when they go out of
287 scope. Thus, the following program may run out of stack space:
288<pre>
289 for (i = 0; i != 1000000; ++i) {
290 int X[n];
291 foo(X);
292 }
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]293</pre></li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]294
Misha Brukmanfa50a222004-05-12 21:46:05 +0000[diff] [blame]295<li>Initialization of global union variables can only be done <a
Misha Brukman68ef9a92004-12-04 00:45:09 +0000[diff] [blame]296href="http://llvm.cs.uiuc.edu/PR162">with the largest union member</a>.</li>
Chris Lattner1ab58dd2004-03-16 21:39:04 +0000[diff] [blame]297
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]298</ul>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]299</div>
300
301<!-- _______________________________________________________________________ -->
302<div class="doc_subsubsection">
303 Notes
304</div>
305
306<div class="doc_text">
307
308<ul>
309
310<li>Inline assembly is not yet supported.</li>
Chris Lattnerd2a74272003-10-27 18:30:37 +0000[diff] [blame]311
312<li>"long double" is transformed by the front-end into "double". There is no
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]313support for floating point data types of any size other than 32 and 64
314bits.</li>
315
316<li>The following Unix system functionality has not been tested and may not
317work:
Misha Brukman7cb4e382003-11-22 01:00:11 +0000[diff] [blame]318 <ol>
319 <li><tt>sigsetjmp</tt>, <tt>siglongjmp</tt> - These are not turned into the
320 appropriate <tt>invoke</tt>/<tt>unwind</tt> instructions. Note that
321 <tt>setjmp</tt> and <tt>longjmp</tt> <em>are</em> compiled correctly.
322 <li><tt>getcontext</tt>, <tt>setcontext</tt>, <tt>makecontext</tt>
323 - These functions have not been tested.
324 </ol></li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]325
326<li>Although many GCC extensions are supported, some are not. In particular,
327 the following extensions are known to <b>not be</b> supported:
328 <ol>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]329 <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]330 <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>
331 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Constructing-Calls.html#Constructing%20Calls">Constructing Calls</a>: Dispatching a call to another function.</li>
332 <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]333 <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]334 <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>
335 <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]336 <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>
337 <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]338 <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]339 <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]340 </ol>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]341
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]342 <p>The following GCC extensions are <b>partially</b> supported. An ignored
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]343 attribute means that the LLVM compiler ignores the presence of the attribute,
344 but the code should still work. An unsupported attribute is one which is
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]345 ignored by the LLVM compiler and will cause a different interpretation of
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]346 the program.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]347
348 <ol>
349 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Length.html#Variable%20Length">Variable Length</a>:
350 Arrays whose length is computed at run time.<br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]351 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]352
353 <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]354
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]355 Declaring that functions have no side effects or that they can never
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]356 return.<br>
357
358 <b>Supported:</b> <tt>format</tt>, <tt>format_arg</tt>, <tt>non_null</tt>,
John Criswell64307722004-12-08 20:35:47 +0000[diff] [blame]359 <tt>noreturn</tt>, <tt>constructor</tt>, <tt>destructor</tt>,
360 <tt>unused</tt>,
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]361 <tt>deprecated</tt>, <tt>warn_unused_result</tt>, <tt>weak</tt><br>
362
John Criswell64307722004-12-08 20:35:47 +0000[diff] [blame]363 <b>Ignored:</b> <tt>noinline</tt>,
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]364 <tt>always_inline</tt>, <tt>pure</tt>, <tt>const</tt>, <tt>nothrow</tt>,
365 <tt>malloc</tt>, <tt>no_instrument_function</tt>, <tt>cdecl</tt><br>
366
367 <b>Unsupported:</b> <tt>used</tt>, <tt>section</tt>, <tt>alias</tt>,
368 <tt>visibility</tt>, <tt>regparm</tt>, <tt>stdcall</tt>,
369 <tt>fastcall</tt>, all other target specific attributes</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]370
371 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Attributes.html#Variable%20Attributes">Variable Attributes</a>:
372 Specifying attributes of variables.<br>
373 <b>Supported:</b> <tt>cleanup</tt>, <tt>common</tt>, <tt>nocommon</tt>,
374 <tt>deprecated</tt>, <tt>transparent_union</tt>,
375 <tt>unused</tt>, <tt>weak</tt><br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]376
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]377 <b>Unsupported:</b> <tt>aligned</tt>, <tt>mode</tt>, <tt>packed</tt>,
378 <tt>section</tt>, <tt>shared</tt>, <tt>tls_model</tt>,
379 <tt>vector_size</tt>, <tt>dllimport</tt>,
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]380 <tt>dllexport</tt>, all target specific attributes.</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]381
Misha Brukman8395d732003-12-12 04:37:31 +0000[diff] [blame]382 <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]383 <b>Supported:</b> <tt>transparent_union</tt>, <tt>unused</tt>,
Misha Brukman8395d732003-12-12 04:37:31 +0000[diff] [blame]384 <tt>deprecated</tt>, <tt>may_alias</tt><br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]385
386 <b>Unsupported:</b> <tt>aligned</tt>, <tt>packed</tt>,
387 all target specific attributes.</li>
388
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]389 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html#Other%20Builtins">Other Builtins</a>:
390 Other built-in functions.<br>
391 We support all builtins which have a C language equivalent (e.g.,
392 <tt>__builtin_cos</tt>), <tt>__builtin_alloca</tt>,
393 <tt>__builtin_types_compatible_p</tt>, <tt>__builtin_choose_expr</tt>,
Chris Lattnerb7c4bac2004-06-18 06:26:29 +0000[diff] [blame]394 <tt>__builtin_constant_p</tt>, and <tt>__builtin_expect</tt>
395 (currently ignored). We also support builtins for ISO C99 floating
Chris Lattnerdb302f82005-03-11 06:16:26 +0000[diff] [blame]396 point comparison macros (e.g., <tt>__builtin_islessequal</tt>), and
397 <tt>__builtin_prefetch</tt>.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]398 </ol>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]399
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]400 <p>The following extensions <b>are</b> known to be supported:</p>
401
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]402 <ol>
Chris Lattnerd3dc8502004-03-16 08:54:07 +0000[diff] [blame]403 <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]404 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html#Statement%20Exprs">Statement Exprs</a>: Putting statements and declarations inside expressions.</li>
405 <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]406 <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]407 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Conditionals.html#Conditionals">Conditionals</a>: Omitting the middle operand of a <code>?:</code> expression.</li>
408 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Long-Long.html#Long%20Long">Long Long</a>: Double-word integers.</li>
409 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Complex.html#Complex">Complex</a>: Data types for complex numbers.</li>
410 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Hex-Floats.html#Hex%20Floats">Hex Floats</a>:Hexadecimal floating-point constants.</li>
411 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html#Zero%20Length">Zero Length</a>: Zero-length arrays.</li>
412 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Empty-Structures.html#Empty%20Structures">Empty Structures</a>: Structures with no members.</li>
413 <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>
414 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Escaped-Newlines.html#Escaped%20Newlines">Escaped Newlines</a>: Slightly looser rules for escaped newlines.</li>
415 <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]416 <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]417 <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]418 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Compound-Literals.html#Compound%20Literals">Compound Literals</a>: Compound literals give structures, unions,
419or arrays as values.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]420 <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]421 <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]422 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Case-Ranges.html#Case%20Ranges">Case Ranges</a>: `case 1 ... 9' and such.</li>
423 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Mixed-Declarations.html#Mixed%20Declarations">Mixed Declarations</a>: Mixing declarations and code.</li>
424 <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]425 <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]426 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Dollar-Signs.html#Dollar%20Signs">Dollar Signs</a>: Dollar sign is allowed in identifiers.</li>
427 <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>
428 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Alignment.html#Alignment">Alignment</a>: Inquiring about the alignment of a type or variable.</li>
429 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Inline.html#Inline">Inline</a>: Defining inline functions (as fast as macros).</li>
430 <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>
431 <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>
432 <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]433 <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]434 <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>
435 <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]436 </ol></li>
437
438</ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]439
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]440<p>If you run into GCC extensions which have not been included in any of these
441lists, please let us know (also including whether or not they work).</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]442
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]443</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]444
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]445<!-- ======================================================================= -->
446<div class="doc_subsection">
447 <a name="c++-fe">Known problems with the C++ front-end</a>
448</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]449
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]450<div class="doc_text">
451
Reid Spencer55684c32004-12-07 08:39:08 +0000[diff] [blame]452<p>For this release, the C++ front-end is considered to be fully
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]453tested and works for a number of non-trivial programs, including LLVM
454itself.</p>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]455
456</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]457
458<!-- _______________________________________________________________________ -->
Chris Lattner141ebb62004-02-14 04:12:41 +0000[diff] [blame]459<div class="doc_subsubsection">Bugs</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]460
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]461<div class="doc_text">
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]462
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]463<ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]464<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]465 front-end</a>.</li>
Chris Lattner041e6c92004-07-17 02:04:41 +0000[diff] [blame]466
Chris Lattner5cd40922004-08-02 20:28:44 +0000[diff] [blame]467<li><b>IA-64 specific</b>: The C++ front-end does not use <a
468href="http://llvm.cs.uiuc.edu/PR406">IA64 ABI compliant layout of v-tables</a>.
Chris Lattner041e6c92004-07-17 02:04:41 +0000[diff] [blame]469In particular, it just stores function pointers instead of function
470descriptors in the vtable. This bug prevents mixing C++ code compiled with
Chris Lattner2fd93492004-08-02 20:29:51 +0000[diff] [blame]471LLVM with C++ objects compiled by other C++ compilers.</li>
Chris Lattner041e6c92004-07-17 02:04:41 +0000[diff] [blame]472
Chris Lattner5cd40922004-08-02 20:28:44 +0000[diff] [blame]473</ul>
474
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]475</div>
476
477<!-- _______________________________________________________________________ -->
478<div class="doc_subsubsection">
479 Notes
480</div>
481
482<div class="doc_text">
483
484<ul>
Chris Lattnerd2a74272003-10-27 18:30:37 +0000[diff] [blame]485
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]486<li>The C++ front-end is based on a pre-release of the GCC 3.4 C++ parser. This
487parser is significantly more standards compliant (and picky) than prior GCC
488versions. For more information, see the C++ section of the <a
Chris Lattnere76e9ab2003-12-12 04:25:33 +0000[diff] [blame]489href="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]490
491<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]492 performed. In particular, destructors for objects in the <tt>longjmp</tt>ing
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]493 function and in the <tt>setjmp</tt> receiver function may not be run.
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]494 Objects in intervening stack frames will be destroyed, however (which is
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]495 better than most compilers).</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]496
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]497<li>The LLVM C++ front-end follows the <a
498 href="http://www.codesourcery.com/cxx-abi">Itanium C++ ABI</a>.
499 This document, which is not Itanium specific, specifies a standard for name
500 mangling, class layout, v-table layout, RTTI formats, and other C++
501 representation issues. Because we use this API, code generated by the LLVM
502 compilers should be binary compatible with machine code generated by other
503 Itanium ABI C++ compilers (such as G++, the Intel and HP compilers, etc).
504 <i>However</i>, the exception handling mechanism used by LLVM is very
505 different from the model used in the Itanium ABI, so <b>exceptions will not
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]506 interact correctly</b>. </li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]507
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]508</ul>
Chris Lattner46ecf612003-10-07 22:14:37 +0000[diff] [blame]509
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]510</div>
511
512<!-- ======================================================================= -->
513<div class="doc_subsection">
514 <a name="x86-be">Known problems with the X86 back-end</a>
515</div>
516
517<div class="doc_text">
518
519<ul>
Chris Lattner5cd40922004-08-02 20:28:44 +0000[diff] [blame]520 <li>none yet</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]521</ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]522
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]523</div>
524
525<!-- ======================================================================= -->
526<div class="doc_subsection">
Misha Brukmana516e992004-07-12 16:55:41 +0000[diff] [blame]527 <a name="sparcv9-be">Known problems with the SparcV9 back-end</a>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]528</div>
529
530<div class="doc_text">
531
532<ul>
Misha Brukmana516e992004-07-12 16:55:41 +0000[diff] [blame]533<li><a href="http://llvm.cs.uiuc.edu/PR60">[sparcv9] SparcV9 backend miscompiles
534several programs in the LLVM test suite</a></li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]535</ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]536
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]537</div>
538
539<!-- ======================================================================= -->
540<div class="doc_subsection">
Chris Lattnerdf925ce2004-11-07 01:55:32 +0000[diff] [blame]541 <a name="ppc-be">Known problems with the PowerPC back-end</a>
542</div>
543
544<div class="doc_text">
545
546<ul>
547<li>none yet</li>
548</ul>
549
550</div>
551
552<!-- ======================================================================= -->
553<div class="doc_subsection">
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]554 <a name="c-be">Known problems with the C back-end</a>
555</div>
556
557<div class="doc_text">
558
559<ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]560
561<li>The C back-end produces code that violates the ANSI C Type-Based Alias
562Analysis rules. As such, special options may be necessary to compile the code
563(for example, GCC requires the <tt>-fno-strict-aliasing</tt> option). This
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]564problem probably cannot be fixed.</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]565
Chris Lattnerc679fbb2003-11-04 20:06:53 +0000[diff] [blame]566<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]567supported</a>. This should not affect LLVM produced by the C or C++
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]568frontends.</li>
Chris Lattnerb28c3282003-10-24 04:03:19 +0000[diff] [blame]569
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]570</ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]571
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]572</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]573
574<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]575<div class="doc_section">
576 <a name="additionalinfo">Additional Information</a>
577</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]578<!-- *********************************************************************** -->
579
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]580<div class="doc_text">
581
582<p>A wide variety of additional information is available on the LLVM web page,
Misha Brukman96158092005-03-30 19:14:24 +0000[diff] [blame]583including <a href="http://llvm.cs.uiuc.edu/docs/#maillist">mailing lists</a> and
584<a href="http://llvm.cs.uiuc.edu/pubs/">publications describing algorithms and
585components implemented in LLVM</a>. The web page also contains versions of the
586API documentation which is up-to-date with the CVS version of the source code.
587You can access versions of these documents specific to this release by going
588into the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]589
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]590<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]591us via the <a href="http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev">mailing
592lists</a>.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]593
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]594</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]595
596<!-- *********************************************************************** -->
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]597
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]598<hr>
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]599<address>
Misha Brukman8834af92003-12-21 22:53:21 +0000[diff] [blame]600 <a href="http://jigsaw.w3.org/css-validator/check/referer"><img
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]601 src="http://jigsaw.w3.org/css-validator/images/vcss" alt="Valid CSS!"></a>
602 <a href="http://validator.w3.org/check/referer"><img
603 src="http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01!" /></a>
604
Misha Brukman7cb4e382003-11-22 01:00:11 +0000[diff] [blame]605 <a href="http://llvm.cs.uiuc.edu">The LLVM Compiler Infrastructure</a><br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]606 Last modified: $Date$
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]607</address>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]608
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]609</body>
610</html>