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gerrit-public.fairphone.software / toolchain / llvm-project / f12594d56fd3b392f09586d7bcfbdf2fba2d7ce2 / . / 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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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>
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 Lattner81c1dd22005-02-28 16:52:28 +0000[diff] [blame]100 <li>LLVM can now create native shared libraries with '<tt>llvm-gcc ...
101 -shared -Wl,-native</tt>' (or with <tt>-Wl,-native-cbe</tt>).</li>
Chris Lattnerdb302f82005-03-11 06:16:26 +0000[diff] [blame]102 <li>LLVM now supports a new "<a href="LangRef.html#i_prefetch">llvm.prefetch
103 </a>" intrinsic, and llvm-gcc now supports __builtin_prefetch.
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]104</ol>
Chris Lattnere7525b52003-10-07 21:38:31 +0000[diff] [blame]105
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]106</div>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]107
108<!--=========================================================================-->
109<div class="doc_subsubsection">
Misha Brukman017f2f32004-04-19 02:56:49 +0000[diff] [blame]110<a name="qualityofimp">In this release, the following Quality of Implementation
111issues were fixed:</a>
Chris Lattner4df78f02003-12-20 03:42:11 +0000[diff] [blame]112</div>
113
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]114<div class="doc_text">
115
Chris Lattner4df78f02003-12-20 03:42:11 +0000[diff] [blame]116<ol>
Chris Lattner64d9d2b2005-01-22 18:45:35 +0000[diff] [blame]117 <li><a href="http://llvm.cs.uiuc.edu/PR448">Building LLVM in optimized mode
118 should no longer cause GCC to hit swap in the PowerPC backend.</a></li>
Brian Gaeke8b05e4f2004-01-16 21:55:04 +0000[diff] [blame]119</ol>
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]120</div>
Brian Gaeke8b05e4f2004-01-16 21:55:04 +0000[diff] [blame]121
122<!--=========================================================================-->
123<div class="doc_subsubsection">
Chris Lattner2ad48782004-05-02 04:19:15 +0000[diff] [blame]124<a name="codequality">This release includes the following Code Quality
125improvements:</a>
Chris Lattner23257062004-05-23 20:42:08 +0000[diff] [blame]126</div>
Chris Lattner639579c2003-10-27 17:06:39 +0000[diff] [blame]127
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]128<div class="doc_text">
Chris Lattner639579c2003-10-27 17:06:39 +0000[diff] [blame]129<ol>
Chris Lattnerf3a7c242004-12-09 22:22:58 +0000[diff] [blame]130 <li></li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]131</ol>
Reid Spencer3e58f582004-05-23 17:23:13 +0000[diff] [blame]132</div>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]133
134<!--=========================================================================-->
135<div class="doc_subsubsection">
Misha Brukman017f2f32004-04-19 02:56:49 +0000[diff] [blame]136<a name="bugfix">In this release, the following bugs in the previous release
137were fixed:</a>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]138</div>
139
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]140<div class="doc_text">
141
Chris Lattnere7525b52003-10-07 21:38:31 +0000[diff] [blame]142
Chris Lattner1c75b252005-02-14 16:57:55 +0000[diff] [blame]143<p>Bugs fixed in the LLVM Core:</p>
Chris Lattnere7525b52003-10-07 21:38:31 +0000[diff] [blame]144<ol>
Chris Lattnerb5c253a2004-12-29 04:39:50 +0000[diff] [blame]145 <li><a href="http://llvm.cs.uiuc.edu/PR491">[dse] DSE deletes stores that
146 are partially overwritten by smaller stores</a></li>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]147</ol>
148
Chris Lattner1c75b252005-02-14 16:57:55 +0000[diff] [blame]149<p>Code Generator Bugs:</p>
150<ol>
151 <li><a href="http://llvm.cs.uiuc.edu/PR490">[cbackend] Logical constant
152 expressions (and/or/xor) not implemented</a></li>
153 <li><a href="http://llvm.cs.uiuc.edu/PR511">[cbackend] C backend does not
154 respect 'volatile'</a></li>
155</ol>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]156
Chris Lattner1c75b252005-02-14 16:57:55 +0000[diff] [blame]157<p>Bugs in the C/C++ front-end:</p>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]158<ol>
Chris Lattnere1329f42005-01-03 04:20:21 +0000[diff] [blame]159 <li><a href="http://llvm.cs.uiuc.edu/PR487">[llvmgcc] llvm-gcc incorrectly
160 rejects some constant initializers involving the addresses of array
161 elements</a></li>
Chris Lattner2a38aea2005-02-11 19:29:52 +0000[diff] [blame]162 <li><a href="http://llvm.cs.uiuc.edu/PR501">[llvm-g++] Crash compiling
163 anonymous union</a></li>
Chris Lattner1c75b252005-02-14 16:57:55 +0000[diff] [blame]164 <li><a href="http://llvm.cs.uiuc.edu/PR509">[llvm-g++] Do not use dynamic
165 initialization where static init will do</a></li>
Chris Lattner1f031b22005-02-15 05:28:06 +0000[diff] [blame]166 <li><a href="http://llvm.cs.uiuc.edu/PR510">[llvmgcc] Field offset
167 miscalculated for some structure fields following bit fields</a></li>
Chris Lattner385a4732005-02-15 07:02:12 +0000[diff] [blame]168 <li><a href="http://llvm.cs.uiuc.edu/PR513">[llvm-g++] Temporary lifetimes
169 incorrect for short circuit logical operations</a></li>
Chris Lattner48c23142005-02-19 07:29:25 +0000[diff] [blame]170 <li><a href="http://llvm.cs.uiuc.edu/PR517">[llvm-gcc] Crash compiling
171 bitfield &lt;-&gt; aggregate assignment</a></li>
Chris Lattner6a3ae642005-02-19 17:13:20 +0000[diff] [blame]172 <li><a href="http://llvm.cs.uiuc.edu/PR520">[llvm-g++] Error compiling
Chris Lattner3d6194f2005-02-19 17:17:32 +0000[diff] [blame]173 virtual function thunk with an unnamed argument</a></li>
Chris Lattner3a8f68e2005-02-20 23:31:49 +0000[diff] [blame]174 <li><a href="http://llvm.cs.uiuc.edu/PR522">[llvm-gcc] Crash on certain
175 C99 complex number routines</a></li>
Chris Lattnerc6e33802005-02-27 19:31:02 +0000[diff] [blame]176 <li><a href="http://llvm.cs.uiuc.edu/PR529">[llvm-g++] Crash using placement
177 new on an array type</a></li>
Brian Gaeke730d8d62004-08-24 07:43:48 +0000[diff] [blame]178</ol>
179
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]180</div>
Reid Spencer3e58f582004-05-23 17:23:13 +0000[diff] [blame]181
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]182<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]183<div class="doc_section">
184 <a name="portability">Portability and Supported Platforms</a>
185</div>
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]186<!-- *********************************************************************** -->
187
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]188<div class="doc_text">
189
John Criswell64307722004-12-08 20:35:47 +0000[diff] [blame]190<p>LLVM is known to work on the following platforms:</p>
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]191
192<ul>
193<li>Intel and AMD machines running Red Hat Linux and FreeBSD (and probably
194 other unix-like systems).</li>
195<li>Sun UltraSPARC workstations running Solaris 8.</li>
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]196<li>Intel and AMD machines running on Win32 with the Cygwin libraries (limited
197 support is available for native builds with Visual C++).</li>
198<li>PowerPC-based Mac OS X systems, running 10.2 and above.</li>
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]199</ul>
200
Brian Gaekee3e557e2004-05-09 05:28:35 +0000[diff] [blame]201<p>The core LLVM infrastructure uses
202<a href="http://www.gnu.org/software/autoconf/">GNU autoconf</a> to adapt itself
203to the machine and operating system on which it is built. However, minor
204porting may be required to get LLVM to work on new platforms. We welcome your
205portability patches and reports of successful builds or error messages.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]206
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]207</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]208
209<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]210<div class="doc_section">
211 <a name="knownproblems">Known Problems</a>
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_text">
216
217<p>This section contains all known problems with the LLVM system, listed by
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]218component. As new problems are discovered, they will be added to these
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]219sections. If you run into a problem, please check the <a
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]220href="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]221there isn't already one.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]222
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]223</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]224
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]225<!-- ======================================================================= -->
226<div class="doc_subsection">
227 <a name="experimental">Experimental features included with this release</a>
228</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]229
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]230<div class="doc_text">
231
Misha Brukmanfa50a222004-05-12 21:46:05 +0000[diff] [blame]232<p>The following components of this LLVM release are either untested, known to
233be broken or unreliable, or are in early development. These components should
234not be relied on, and bugs should not be filed against them, but they may be
235useful to some people. In particular, if you would like to work on one of these
236components, please contact us on the llvmdev list.</p>
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]237
238<ul>
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]239<li>The following passes are incomplete or buggy, and may be removed in future
Chris Lattner38389b12005-01-28 06:13:52 +0000[diff] [blame]240 releases: <tt>-cee, -branch-combine, -instloops, -paths, -pre</tt></li>
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]241<li>The <tt>llvm-db</tt> tool is in a very early stage of development, but can
242 be used to step through programs and inspect the stack.</li>
Chris Lattnerfa835102004-12-02 17:20:17 +0000[diff] [blame]243<li>The "iterative scan" register allocator (enabled with -regalloc=iterativescan)
244 is not stable.</li>
Misha Brukmanf12594d2005-03-18 00:48:56 +0000[diff] [blame^]245<li>The SparcV8, Alpha, and IA64 ports are experimental.</li>
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]246</ul>
247
248</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]249
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]250<!-- ======================================================================= -->
251<div class="doc_subsection">
252 <a name="core">Known problems with the LLVM Core</a>
253</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]254
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]255<div class="doc_text">
256
257<ul>
Reid Spencer493d9c22004-11-25 22:38:30 +0000[diff] [blame]258 <li>In the JIT, <tt>dlsym</tt> on a symbol compiled by the JIT will not work.
259 </li>
260 <li>The JIT does not use mutexes to protect its internal data structures. As
261 such, execution of a threaded program could cause these data structures to be
262 corrupted.
263 </li>
Reid Spencer493d9c22004-11-25 22:38:30 +0000[diff] [blame]264 <li><a href="http://llvm.cs.uiuc.edu/PR240">The lower-invoke pass does not
265 mark values live across a setjmp as volatile</a>. This missing feature
266 only affects targets whose setjmp/longjmp libraries do not save and restore
267 the entire register file.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]268</ul>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]269</div>
270
271<!-- ======================================================================= -->
272<div class="doc_subsection">
273 <a name="c-fe">Known problems with the C front-end</a>
274</div>
Chris Lattner178f3db2003-10-02 05:07:23 +0000[diff] [blame]275
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]276<!-- _______________________________________________________________________ -->
Chris Lattner5a8a7282003-12-14 05:03:43 +0000[diff] [blame]277<div class="doc_subsubsection">Bugs</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]278
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]279<div class="doc_text">
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]280<ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]281<li>C99 Variable sized arrays do not release stack memory when they go out of
282 scope. Thus, the following program may run out of stack space:
283<pre>
284 for (i = 0; i != 1000000; ++i) {
285 int X[n];
286 foo(X);
287 }
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]288</pre></li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]289
Misha Brukmanfa50a222004-05-12 21:46:05 +0000[diff] [blame]290<li>Initialization of global union variables can only be done <a
Misha Brukman68ef9a92004-12-04 00:45:09 +0000[diff] [blame]291href="http://llvm.cs.uiuc.edu/PR162">with the largest union member</a>.</li>
Chris Lattner1ab58dd2004-03-16 21:39:04 +0000[diff] [blame]292
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]293</ul>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]294</div>
295
296<!-- _______________________________________________________________________ -->
297<div class="doc_subsubsection">
298 Notes
299</div>
300
301<div class="doc_text">
302
303<ul>
304
305<li>Inline assembly is not yet supported.</li>
Chris Lattnerd2a74272003-10-27 18:30:37 +0000[diff] [blame]306
307<li>"long double" is transformed by the front-end into "double". There is no
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]308support for floating point data types of any size other than 32 and 64
309bits.</li>
310
311<li>The following Unix system functionality has not been tested and may not
312work:
Misha Brukman7cb4e382003-11-22 01:00:11 +0000[diff] [blame]313 <ol>
314 <li><tt>sigsetjmp</tt>, <tt>siglongjmp</tt> - These are not turned into the
315 appropriate <tt>invoke</tt>/<tt>unwind</tt> instructions. Note that
316 <tt>setjmp</tt> and <tt>longjmp</tt> <em>are</em> compiled correctly.
317 <li><tt>getcontext</tt>, <tt>setcontext</tt>, <tt>makecontext</tt>
318 - These functions have not been tested.
319 </ol></li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]320
321<li>Although many GCC extensions are supported, some are not. In particular,
322 the following extensions are known to <b>not be</b> supported:
323 <ol>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]324 <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]325 <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>
326 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Constructing-Calls.html#Constructing%20Calls">Constructing Calls</a>: Dispatching a call to another function.</li>
327 <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]328 <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]329 <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>
330 <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]331 <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>
332 <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]333 <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]334 <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]335 </ol>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]336
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]337 <p>The following GCC extensions are <b>partially</b> supported. An ignored
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]338 attribute means that the LLVM compiler ignores the presence of the attribute,
339 but the code should still work. An unsupported attribute is one which is
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]340 ignored by the LLVM compiler and will cause a different interpretation of
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]341 the program.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]342
343 <ol>
344 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Length.html#Variable%20Length">Variable Length</a>:
345 Arrays whose length is computed at run time.<br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]346 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]347
348 <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]349
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]350 Declaring that functions have no side effects or that they can never
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]351 return.<br>
352
353 <b>Supported:</b> <tt>format</tt>, <tt>format_arg</tt>, <tt>non_null</tt>,
John Criswell64307722004-12-08 20:35:47 +0000[diff] [blame]354 <tt>noreturn</tt>, <tt>constructor</tt>, <tt>destructor</tt>,
355 <tt>unused</tt>,
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]356 <tt>deprecated</tt>, <tt>warn_unused_result</tt>, <tt>weak</tt><br>
357
John Criswell64307722004-12-08 20:35:47 +0000[diff] [blame]358 <b>Ignored:</b> <tt>noinline</tt>,
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]359 <tt>always_inline</tt>, <tt>pure</tt>, <tt>const</tt>, <tt>nothrow</tt>,
360 <tt>malloc</tt>, <tt>no_instrument_function</tt>, <tt>cdecl</tt><br>
361
362 <b>Unsupported:</b> <tt>used</tt>, <tt>section</tt>, <tt>alias</tt>,
363 <tt>visibility</tt>, <tt>regparm</tt>, <tt>stdcall</tt>,
364 <tt>fastcall</tt>, all other target specific attributes</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]365
366 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Attributes.html#Variable%20Attributes">Variable Attributes</a>:
367 Specifying attributes of variables.<br>
368 <b>Supported:</b> <tt>cleanup</tt>, <tt>common</tt>, <tt>nocommon</tt>,
369 <tt>deprecated</tt>, <tt>transparent_union</tt>,
370 <tt>unused</tt>, <tt>weak</tt><br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]371
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]372 <b>Unsupported:</b> <tt>aligned</tt>, <tt>mode</tt>, <tt>packed</tt>,
373 <tt>section</tt>, <tt>shared</tt>, <tt>tls_model</tt>,
374 <tt>vector_size</tt>, <tt>dllimport</tt>,
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]375 <tt>dllexport</tt>, all target specific attributes.</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]376
Misha Brukman8395d732003-12-12 04:37:31 +0000[diff] [blame]377 <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]378 <b>Supported:</b> <tt>transparent_union</tt>, <tt>unused</tt>,
Misha Brukman8395d732003-12-12 04:37:31 +0000[diff] [blame]379 <tt>deprecated</tt>, <tt>may_alias</tt><br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]380
381 <b>Unsupported:</b> <tt>aligned</tt>, <tt>packed</tt>,
382 all target specific attributes.</li>
383
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]384 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html#Other%20Builtins">Other Builtins</a>:
385 Other built-in functions.<br>
386 We support all builtins which have a C language equivalent (e.g.,
387 <tt>__builtin_cos</tt>), <tt>__builtin_alloca</tt>,
388 <tt>__builtin_types_compatible_p</tt>, <tt>__builtin_choose_expr</tt>,
Chris Lattnerb7c4bac2004-06-18 06:26:29 +0000[diff] [blame]389 <tt>__builtin_constant_p</tt>, and <tt>__builtin_expect</tt>
390 (currently ignored). We also support builtins for ISO C99 floating
Chris Lattnerdb302f82005-03-11 06:16:26 +0000[diff] [blame]391 point comparison macros (e.g., <tt>__builtin_islessequal</tt>), and
392 <tt>__builtin_prefetch</tt>.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]393 </ol>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]394
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]395 <p>The following extensions <b>are</b> known to be supported:</p>
396
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]397 <ol>
Chris Lattnerd3dc8502004-03-16 08:54:07 +0000[diff] [blame]398 <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]399 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html#Statement%20Exprs">Statement Exprs</a>: Putting statements and declarations inside expressions.</li>
400 <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]401 <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]402 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Conditionals.html#Conditionals">Conditionals</a>: Omitting the middle operand of a <code>?:</code> expression.</li>
403 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Long-Long.html#Long%20Long">Long Long</a>: Double-word integers.</li>
404 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Complex.html#Complex">Complex</a>: Data types for complex numbers.</li>
405 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Hex-Floats.html#Hex%20Floats">Hex Floats</a>:Hexadecimal floating-point constants.</li>
406 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html#Zero%20Length">Zero Length</a>: Zero-length arrays.</li>
407 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Empty-Structures.html#Empty%20Structures">Empty Structures</a>: Structures with no members.</li>
408 <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>
409 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Escaped-Newlines.html#Escaped%20Newlines">Escaped Newlines</a>: Slightly looser rules for escaped newlines.</li>
410 <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]411 <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]412 <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]413 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Compound-Literals.html#Compound%20Literals">Compound Literals</a>: Compound literals give structures, unions,
414or arrays as values.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]415 <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]416 <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]417 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Case-Ranges.html#Case%20Ranges">Case Ranges</a>: `case 1 ... 9' and such.</li>
418 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Mixed-Declarations.html#Mixed%20Declarations">Mixed Declarations</a>: Mixing declarations and code.</li>
419 <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]420 <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]421 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Dollar-Signs.html#Dollar%20Signs">Dollar Signs</a>: Dollar sign is allowed in identifiers.</li>
422 <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>
423 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Alignment.html#Alignment">Alignment</a>: Inquiring about the alignment of a type or variable.</li>
424 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Inline.html#Inline">Inline</a>: Defining inline functions (as fast as macros).</li>
425 <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>
426 <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>
427 <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]428 <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]429 <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>
430 <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]431 </ol></li>
432
433</ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]434
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]435<p>If you run into GCC extensions which have not been included in any of these
436lists, please let us know (also including whether or not they work).</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]437
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]438</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]439
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]440<!-- ======================================================================= -->
441<div class="doc_subsection">
442 <a name="c++-fe">Known problems with the C++ front-end</a>
443</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]444
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]445<div class="doc_text">
446
Reid Spencer55684c32004-12-07 08:39:08 +0000[diff] [blame]447<p>For this release, the C++ front-end is considered to be fully
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]448tested and works for a number of non-trivial programs, including LLVM
449itself.</p>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]450
451</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]452
453<!-- _______________________________________________________________________ -->
Chris Lattner141ebb62004-02-14 04:12:41 +0000[diff] [blame]454<div class="doc_subsubsection">Bugs</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]455
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]456<div class="doc_text">
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]457
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]458<ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]459<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]460 front-end</a>.</li>
Chris Lattner041e6c92004-07-17 02:04:41 +0000[diff] [blame]461
Chris Lattner5cd40922004-08-02 20:28:44 +0000[diff] [blame]462<li><b>IA-64 specific</b>: The C++ front-end does not use <a
463href="http://llvm.cs.uiuc.edu/PR406">IA64 ABI compliant layout of v-tables</a>.
Chris Lattner041e6c92004-07-17 02:04:41 +0000[diff] [blame]464In particular, it just stores function pointers instead of function
465descriptors in the vtable. This bug prevents mixing C++ code compiled with
Chris Lattner2fd93492004-08-02 20:29:51 +0000[diff] [blame]466LLVM with C++ objects compiled by other C++ compilers.</li>
Chris Lattner041e6c92004-07-17 02:04:41 +0000[diff] [blame]467
Chris Lattner5cd40922004-08-02 20:28:44 +0000[diff] [blame]468</ul>
469
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]470</div>
471
472<!-- _______________________________________________________________________ -->
473<div class="doc_subsubsection">
474 Notes
475</div>
476
477<div class="doc_text">
478
479<ul>
Chris Lattnerd2a74272003-10-27 18:30:37 +0000[diff] [blame]480
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]481<li>The C++ front-end is based on a pre-release of the GCC 3.4 C++ parser. This
482parser is significantly more standards compliant (and picky) than prior GCC
483versions. For more information, see the C++ section of the <a
Chris Lattnere76e9ab2003-12-12 04:25:33 +0000[diff] [blame]484href="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]485
486<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]487 performed. In particular, destructors for objects in the <tt>longjmp</tt>ing
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]488 function and in the <tt>setjmp</tt> receiver function may not be run.
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]489 Objects in intervening stack frames will be destroyed, however (which is
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]490 better than most compilers).</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]491
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]492<li>The LLVM C++ front-end follows the <a
493 href="http://www.codesourcery.com/cxx-abi">Itanium C++ ABI</a>.
494 This document, which is not Itanium specific, specifies a standard for name
495 mangling, class layout, v-table layout, RTTI formats, and other C++
496 representation issues. Because we use this API, code generated by the LLVM
497 compilers should be binary compatible with machine code generated by other
498 Itanium ABI C++ compilers (such as G++, the Intel and HP compilers, etc).
499 <i>However</i>, the exception handling mechanism used by LLVM is very
500 different from the model used in the Itanium ABI, so <b>exceptions will not
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]501 interact correctly</b>. </li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]502
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]503</ul>
Chris Lattner46ecf612003-10-07 22:14:37 +0000[diff] [blame]504
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]505</div>
506
507<!-- ======================================================================= -->
508<div class="doc_subsection">
509 <a name="x86-be">Known problems with the X86 back-end</a>
510</div>
511
512<div class="doc_text">
513
514<ul>
Chris Lattner5cd40922004-08-02 20:28:44 +0000[diff] [blame]515 <li>none yet</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]516</ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]517
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]518</div>
519
520<!-- ======================================================================= -->
521<div class="doc_subsection">
Misha Brukmana516e992004-07-12 16:55:41 +0000[diff] [blame]522 <a name="sparcv9-be">Known problems with the SparcV9 back-end</a>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]523</div>
524
525<div class="doc_text">
526
527<ul>
Misha Brukmana516e992004-07-12 16:55:41 +0000[diff] [blame]528<li><a href="http://llvm.cs.uiuc.edu/PR60">[sparcv9] SparcV9 backend miscompiles
529several programs in the LLVM test suite</a></li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]530</ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]531
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]532</div>
533
534<!-- ======================================================================= -->
535<div class="doc_subsection">
Chris Lattnerdf925ce2004-11-07 01:55:32 +0000[diff] [blame]536 <a name="ppc-be">Known problems with the PowerPC back-end</a>
537</div>
538
539<div class="doc_text">
540
541<ul>
542<li>none yet</li>
543</ul>
544
545</div>
546
547<!-- ======================================================================= -->
548<div class="doc_subsection">
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]549 <a name="c-be">Known problems with the C back-end</a>
550</div>
551
552<div class="doc_text">
553
554<ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]555
556<li>The C back-end produces code that violates the ANSI C Type-Based Alias
557Analysis rules. As such, special options may be necessary to compile the code
558(for example, GCC requires the <tt>-fno-strict-aliasing</tt> option). This
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]559problem probably cannot be fixed.</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]560
Chris Lattnerc679fbb2003-11-04 20:06:53 +0000[diff] [blame]561<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]562supported</a>. This should not affect LLVM produced by the C or C++
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]563frontends.</li>
Chris Lattnerb28c3282003-10-24 04:03:19 +0000[diff] [blame]564
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]565</ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]566
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]567</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]568
569<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]570<div class="doc_section">
571 <a name="additionalinfo">Additional Information</a>
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_text">
576
577<p>A wide variety of additional information is available on the LLVM web page,
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]578including mailing lists and publications describing algorithms and components
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]579implemented in LLVM. The web page also contains versions of the API
580documentation which is up-to-date with the CVS version of the source code. You
581can access versions of these documents specific to this release by going into
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]582the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]583
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]584<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]585us via the <a href="http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev">mailing
586lists</a>.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]587
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]588</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]589
590<!-- *********************************************************************** -->
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]591
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]592<hr>
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]593<address>
Misha Brukman8834af92003-12-21 22:53:21 +0000[diff] [blame]594 <a href="http://jigsaw.w3.org/css-validator/check/referer"><img
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596 <a href="http://validator.w3.org/check/referer"><img
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598
Misha Brukman7cb4e382003-11-22 01:00:11 +0000[diff] [blame]599 <a href="http://llvm.cs.uiuc.edu">The LLVM Compiler Infrastructure</a><br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]600 Last modified: $Date$
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]601</address>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]602
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]603</body>
604</html>