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gerrit-public.fairphone.software / toolchain / llvm-project / 81c1dd2a0630845f2442720165189c9d0414d355 / . / 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>
83 <li>LLVM includes new experimental native code generators for SparcV8 and
84 Alpha.</li>
85 <li>Support for Microsoft Visual Studio is improved, and <a
Chris Lattnerbe895ed2005-02-14 22:58:38 +0000[diff] [blame]86 href="GettingStartedVS.html">now documented</a>.</li>
Chris Lattner592db402003-11-19 22:05:38 +0000[diff] [blame]87</ol>
Chris Lattner4491de62003-11-08 04:28:55 +0000[diff] [blame]88
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]89</div>
90
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]91
92<!--=========================================================================-->
93<div class="doc_subsubsection">
94In this release, the following missing features were implemented:
95</div>
Chris Lattner4491de62003-11-08 04:28:55 +0000[diff] [blame]96
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]97<div class="doc_text">
98
Chris Lattner4491de62003-11-08 04:28:55 +0000[diff] [blame]99<ol>
Chris 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>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]102</ol>
Chris Lattnere7525b52003-10-07 21:38:31 +0000[diff] [blame]103
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]104</div>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]105
106<!--=========================================================================-->
107<div class="doc_subsubsection">
Misha Brukman017f2f32004-04-19 02:56:49 +0000[diff] [blame]108<a name="qualityofimp">In this release, the following Quality of Implementation
109issues were fixed:</a>
Chris Lattner4df78f02003-12-20 03:42:11 +0000[diff] [blame]110</div>
111
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]112<div class="doc_text">
113
Chris Lattner4df78f02003-12-20 03:42:11 +0000[diff] [blame]114<ol>
Chris Lattner64d9d2b2005-01-22 18:45:35 +0000[diff] [blame]115 <li><a href="http://llvm.cs.uiuc.edu/PR448">Building LLVM in optimized mode
116 should no longer cause GCC to hit swap in the PowerPC backend.</a></li>
Brian Gaeke8b05e4f2004-01-16 21:55:04 +0000[diff] [blame]117</ol>
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]118</div>
Brian Gaeke8b05e4f2004-01-16 21:55:04 +0000[diff] [blame]119
120<!--=========================================================================-->
121<div class="doc_subsubsection">
Chris Lattner2ad48782004-05-02 04:19:15 +0000[diff] [blame]122<a name="codequality">This release includes the following Code Quality
123improvements:</a>
Chris Lattner23257062004-05-23 20:42:08 +0000[diff] [blame]124</div>
Chris Lattner639579c2003-10-27 17:06:39 +0000[diff] [blame]125
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]126<div class="doc_text">
Chris Lattner639579c2003-10-27 17:06:39 +0000[diff] [blame]127<ol>
Chris Lattnerf3a7c242004-12-09 22:22:58 +0000[diff] [blame]128 <li></li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]129</ol>
Reid Spencer3e58f582004-05-23 17:23:13 +0000[diff] [blame]130</div>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]131
132<!--=========================================================================-->
133<div class="doc_subsubsection">
Misha Brukman017f2f32004-04-19 02:56:49 +0000[diff] [blame]134<a name="bugfix">In this release, the following bugs in the previous release
135were fixed:</a>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]136</div>
137
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]138<div class="doc_text">
139
Chris Lattnere7525b52003-10-07 21:38:31 +0000[diff] [blame]140
Chris Lattner1c75b252005-02-14 16:57:55 +0000[diff] [blame]141<p>Bugs fixed in the LLVM Core:</p>
Chris Lattnere7525b52003-10-07 21:38:31 +0000[diff] [blame]142<ol>
Chris Lattnerb5c253a2004-12-29 04:39:50 +0000[diff] [blame]143 <li><a href="http://llvm.cs.uiuc.edu/PR491">[dse] DSE deletes stores that
144 are partially overwritten by smaller stores</a></li>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]145</ol>
146
Chris Lattner1c75b252005-02-14 16:57:55 +0000[diff] [blame]147<p>Code Generator Bugs:</p>
148<ol>
149 <li><a href="http://llvm.cs.uiuc.edu/PR490">[cbackend] Logical constant
150 expressions (and/or/xor) not implemented</a></li>
151 <li><a href="http://llvm.cs.uiuc.edu/PR511">[cbackend] C backend does not
152 respect 'volatile'</a></li>
153</ol>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]154
Chris Lattner1c75b252005-02-14 16:57:55 +0000[diff] [blame]155<p>Bugs in the C/C++ front-end:</p>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]156<ol>
Chris Lattnere1329f42005-01-03 04:20:21 +0000[diff] [blame]157 <li><a href="http://llvm.cs.uiuc.edu/PR487">[llvmgcc] llvm-gcc incorrectly
158 rejects some constant initializers involving the addresses of array
159 elements</a></li>
Chris Lattner2a38aea2005-02-11 19:29:52 +0000[diff] [blame]160 <li><a href="http://llvm.cs.uiuc.edu/PR501">[llvm-g++] Crash compiling
161 anonymous union</a></li>
Chris Lattner1c75b252005-02-14 16:57:55 +0000[diff] [blame]162 <li><a href="http://llvm.cs.uiuc.edu/PR509">[llvm-g++] Do not use dynamic
163 initialization where static init will do</a></li>
Chris Lattner1f031b22005-02-15 05:28:06 +0000[diff] [blame]164 <li><a href="http://llvm.cs.uiuc.edu/PR510">[llvmgcc] Field offset
165 miscalculated for some structure fields following bit fields</a></li>
Chris Lattner385a4732005-02-15 07:02:12 +0000[diff] [blame]166 <li><a href="http://llvm.cs.uiuc.edu/PR513">[llvm-g++] Temporary lifetimes
167 incorrect for short circuit logical operations</a></li>
Chris Lattner48c23142005-02-19 07:29:25 +0000[diff] [blame]168 <li><a href="http://llvm.cs.uiuc.edu/PR517">[llvm-gcc] Crash compiling
169 bitfield &lt;-&gt; aggregate assignment</a></li>
Chris Lattner6a3ae642005-02-19 17:13:20 +0000[diff] [blame]170 <li><a href="http://llvm.cs.uiuc.edu/PR520">[llvm-g++] Error compiling
Chris Lattner3d6194f2005-02-19 17:17:32 +0000[diff] [blame]171 virtual function thunk with an unnamed argument</a></li>
Chris Lattner3a8f68e2005-02-20 23:31:49 +0000[diff] [blame]172 <li><a href="http://llvm.cs.uiuc.edu/PR522">[llvm-gcc] Crash on certain
173 C99 complex number routines</a></li>
Chris Lattnerc6e33802005-02-27 19:31:02 +0000[diff] [blame]174 <li><a href="http://llvm.cs.uiuc.edu/PR529">[llvm-g++] Crash using placement
175 new on an array type</a></li>
Brian Gaeke730d8d62004-08-24 07:43:48 +0000[diff] [blame]176</ol>
177
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]178</div>
Reid Spencer3e58f582004-05-23 17:23:13 +0000[diff] [blame]179
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]180<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]181<div class="doc_section">
182 <a name="portability">Portability and Supported Platforms</a>
183</div>
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]184<!-- *********************************************************************** -->
185
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]186<div class="doc_text">
187
John Criswell64307722004-12-08 20:35:47 +0000[diff] [blame]188<p>LLVM is known to work on the following platforms:</p>
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]189
190<ul>
191<li>Intel and AMD machines running Red Hat Linux and FreeBSD (and probably
192 other unix-like systems).</li>
193<li>Sun UltraSPARC workstations running Solaris 8.</li>
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]194<li>Intel and AMD machines running on Win32 with the Cygwin libraries (limited
195 support is available for native builds with Visual C++).</li>
196<li>PowerPC-based Mac OS X systems, running 10.2 and above.</li>
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]197</ul>
198
Brian Gaekee3e557e2004-05-09 05:28:35 +0000[diff] [blame]199<p>The core LLVM infrastructure uses
200<a href="http://www.gnu.org/software/autoconf/">GNU autoconf</a> to adapt itself
201to the machine and operating system on which it is built. However, minor
202porting may be required to get LLVM to work on new platforms. We welcome your
203portability patches and reports of successful builds or error messages.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]204
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]205</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]206
207<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]208<div class="doc_section">
209 <a name="knownproblems">Known Problems</a>
210</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]211<!-- *********************************************************************** -->
212
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]213<div class="doc_text">
214
215<p>This section contains all known problems with the LLVM system, listed by
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]216component. As new problems are discovered, they will be added to these
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]217sections. If you run into a problem, please check the <a
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]218href="http://llvm.cs.uiuc.edu/bugs/">LLVM bug database</a> and submit a bug if
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]219there isn't already one.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]220
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]221</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]222
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]223<!-- ======================================================================= -->
224<div class="doc_subsection">
225 <a name="experimental">Experimental features included with this release</a>
226</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]227
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]228<div class="doc_text">
229
Misha Brukmanfa50a222004-05-12 21:46:05 +0000[diff] [blame]230<p>The following components of this LLVM release are either untested, known to
231be broken or unreliable, or are in early development. These components should
232not be relied on, and bugs should not be filed against them, but they may be
233useful to some people. In particular, if you would like to work on one of these
234components, please contact us on the llvmdev list.</p>
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]235
236<ul>
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]237<li>The following passes are incomplete or buggy, and may be removed in future
Chris Lattner38389b12005-01-28 06:13:52 +0000[diff] [blame]238 releases: <tt>-cee, -branch-combine, -instloops, -paths, -pre</tt></li>
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]239<li>The <tt>llvm-db</tt> tool is in a very early stage of development, but can
240 be used to step through programs and inspect the stack.</li>
Chris Lattnerfa835102004-12-02 17:20:17 +0000[diff] [blame]241<li>The "iterative scan" register allocator (enabled with -regalloc=iterativescan)
242 is not stable.</li>
Chris Lattnere14babd2005-02-13 22:27:24 +0000[diff] [blame]243<li>The SparcV8 and Alpha ports are experimental.</li>
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]244</ul>
245
246</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]247
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]248<!-- ======================================================================= -->
249<div class="doc_subsection">
250 <a name="core">Known problems with the LLVM Core</a>
251</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]252
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]253<div class="doc_text">
254
255<ul>
Reid Spencer493d9c22004-11-25 22:38:30 +0000[diff] [blame]256 <li>In the JIT, <tt>dlsym</tt> on a symbol compiled by the JIT will not work.
257 </li>
258 <li>The JIT does not use mutexes to protect its internal data structures. As
259 such, execution of a threaded program could cause these data structures to be
260 corrupted.
261 </li>
Reid Spencer493d9c22004-11-25 22:38:30 +0000[diff] [blame]262 <li><a href="http://llvm.cs.uiuc.edu/PR240">The lower-invoke pass does not
263 mark values live across a setjmp as volatile</a>. This missing feature
264 only affects targets whose setjmp/longjmp libraries do not save and restore
265 the entire register file.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]266</ul>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]267</div>
268
269<!-- ======================================================================= -->
270<div class="doc_subsection">
271 <a name="c-fe">Known problems with the C front-end</a>
272</div>
Chris Lattner178f3db2003-10-02 05:07:23 +0000[diff] [blame]273
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]274<!-- _______________________________________________________________________ -->
Chris Lattner5a8a7282003-12-14 05:03:43 +0000[diff] [blame]275<div class="doc_subsubsection">Bugs</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]276
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]277<div class="doc_text">
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]278<ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]279<li>C99 Variable sized arrays do not release stack memory when they go out of
280 scope. Thus, the following program may run out of stack space:
281<pre>
282 for (i = 0; i != 1000000; ++i) {
283 int X[n];
284 foo(X);
285 }
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]286</pre></li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]287
Misha Brukmanfa50a222004-05-12 21:46:05 +0000[diff] [blame]288<li>Initialization of global union variables can only be done <a
Misha Brukman68ef9a92004-12-04 00:45:09 +0000[diff] [blame]289href="http://llvm.cs.uiuc.edu/PR162">with the largest union member</a>.</li>
Chris Lattner1ab58dd2004-03-16 21:39:04 +0000[diff] [blame]290
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]291</ul>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]292</div>
293
294<!-- _______________________________________________________________________ -->
295<div class="doc_subsubsection">
296 Notes
297</div>
298
299<div class="doc_text">
300
301<ul>
302
303<li>Inline assembly is not yet supported.</li>
Chris Lattnerd2a74272003-10-27 18:30:37 +0000[diff] [blame]304
305<li>"long double" is transformed by the front-end into "double". There is no
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]306support for floating point data types of any size other than 32 and 64
307bits.</li>
308
309<li>The following Unix system functionality has not been tested and may not
310work:
Misha Brukman7cb4e382003-11-22 01:00:11 +0000[diff] [blame]311 <ol>
312 <li><tt>sigsetjmp</tt>, <tt>siglongjmp</tt> - These are not turned into the
313 appropriate <tt>invoke</tt>/<tt>unwind</tt> instructions. Note that
314 <tt>setjmp</tt> and <tt>longjmp</tt> <em>are</em> compiled correctly.
315 <li><tt>getcontext</tt>, <tt>setcontext</tt>, <tt>makecontext</tt>
316 - These functions have not been tested.
317 </ol></li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]318
319<li>Although many GCC extensions are supported, some are not. In particular,
320 the following extensions are known to <b>not be</b> supported:
321 <ol>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]322 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Local-Labels.html#Local%20Labels">Local Labels</a>: Labels local to a block.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]323 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Nested-Functions.html#Nested%20Functions">Nested Functions</a>: As in Algol and Pascal, lexical scoping of functions.</li>
324 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Constructing-Calls.html#Constructing%20Calls">Constructing Calls</a>: Dispatching a call to another function.</li>
325 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Extended-Asm.html#Extended%20Asm">Extended Asm</a>: Assembler instructions with C expressions as operands.</li>
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]326 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Constraints.html#Constraints">Constraints</a>: Constraints for asm operands.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]327 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Asm-Labels.html#Asm%20Labels">Asm Labels</a>: Specifying the assembler name to use for a C symbol.</li>
328 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Explicit-Reg-Vars.html#Explicit%20Reg%20Vars">Explicit Reg Vars</a>: Defining variables residing in specified registers.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]329 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Vector-Extensions.html#Vector%20Extensions">Vector Extensions</a>: Using vector instructions through built-in functions.</li>
330 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Target-Builtins.html#Target%20Builtins">Target Builtins</a>: Built-in functions specific to particular targets.</li>
Tanya Lattner63371342004-12-08 18:25:34 +0000[diff] [blame]331 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Thread_002dLocal.html">Thread-Local</a>: Per-thread variables.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]332 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Pragmas.html#Pragmas">Pragmas</a>: Pragmas accepted by GCC.</li>
Misha Brukman7cb4e382003-11-22 01:00:11 +0000[diff] [blame]333 </ol>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]334
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]335 <p>The following GCC extensions are <b>partially</b> supported. An ignored
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]336 attribute means that the LLVM compiler ignores the presence of the attribute,
337 but the code should still work. An unsupported attribute is one which is
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]338 ignored by the LLVM compiler and will cause a different interpretation of
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]339 the program.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]340
341 <ol>
342 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Length.html#Variable%20Length">Variable Length</a>:
343 Arrays whose length is computed at run time.<br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]344 Supported, but allocated stack space is not freed until the function returns (noted above).</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]345
346 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html#Function%20Attributes">Function Attributes</a>:
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]347
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]348 Declaring that functions have no side effects or that they can never
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]349 return.<br>
350
351 <b>Supported:</b> <tt>format</tt>, <tt>format_arg</tt>, <tt>non_null</tt>,
John Criswell64307722004-12-08 20:35:47 +0000[diff] [blame]352 <tt>noreturn</tt>, <tt>constructor</tt>, <tt>destructor</tt>,
353 <tt>unused</tt>,
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]354 <tt>deprecated</tt>, <tt>warn_unused_result</tt>, <tt>weak</tt><br>
355
John Criswell64307722004-12-08 20:35:47 +0000[diff] [blame]356 <b>Ignored:</b> <tt>noinline</tt>,
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]357 <tt>always_inline</tt>, <tt>pure</tt>, <tt>const</tt>, <tt>nothrow</tt>,
358 <tt>malloc</tt>, <tt>no_instrument_function</tt>, <tt>cdecl</tt><br>
359
360 <b>Unsupported:</b> <tt>used</tt>, <tt>section</tt>, <tt>alias</tt>,
361 <tt>visibility</tt>, <tt>regparm</tt>, <tt>stdcall</tt>,
362 <tt>fastcall</tt>, all other target specific attributes</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]363
364 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Attributes.html#Variable%20Attributes">Variable Attributes</a>:
365 Specifying attributes of variables.<br>
366 <b>Supported:</b> <tt>cleanup</tt>, <tt>common</tt>, <tt>nocommon</tt>,
367 <tt>deprecated</tt>, <tt>transparent_union</tt>,
368 <tt>unused</tt>, <tt>weak</tt><br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]369
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]370 <b>Unsupported:</b> <tt>aligned</tt>, <tt>mode</tt>, <tt>packed</tt>,
371 <tt>section</tt>, <tt>shared</tt>, <tt>tls_model</tt>,
372 <tt>vector_size</tt>, <tt>dllimport</tt>,
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]373 <tt>dllexport</tt>, all target specific attributes.</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]374
Misha Brukman8395d732003-12-12 04:37:31 +0000[diff] [blame]375 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Type-Attributes.html#Type%20Attributes">Type Attributes</a>: Specifying attributes of types.<br>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]376 <b>Supported:</b> <tt>transparent_union</tt>, <tt>unused</tt>,
Misha Brukman8395d732003-12-12 04:37:31 +0000[diff] [blame]377 <tt>deprecated</tt>, <tt>may_alias</tt><br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]378
379 <b>Unsupported:</b> <tt>aligned</tt>, <tt>packed</tt>,
380 all target specific attributes.</li>
381
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]382 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html#Other%20Builtins">Other Builtins</a>:
383 Other built-in functions.<br>
384 We support all builtins which have a C language equivalent (e.g.,
385 <tt>__builtin_cos</tt>), <tt>__builtin_alloca</tt>,
386 <tt>__builtin_types_compatible_p</tt>, <tt>__builtin_choose_expr</tt>,
Chris Lattnerb7c4bac2004-06-18 06:26:29 +0000[diff] [blame]387 <tt>__builtin_constant_p</tt>, and <tt>__builtin_expect</tt>
388 (currently ignored). We also support builtins for ISO C99 floating
389 point comparison macros (e.g., <tt>__builtin_islessequal</tt>).</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]390 </ol>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]391
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]392 <p>The following extensions <b>are</b> known to be supported:</p>
393
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]394 <ol>
Chris Lattnerd3dc8502004-03-16 08:54:07 +0000[diff] [blame]395 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Labels-as-Values.html#Labels%20as%20Values">Labels as Values</a>: Getting pointers to labels and computed gotos.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]396 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html#Statement%20Exprs">Statement Exprs</a>: Putting statements and declarations inside expressions.</li>
397 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Typeof.html#Typeof">Typeof</a>: <code>typeof</code>: referring to the type of an expression.</li>
Tanya Lattnerce33a1b2004-06-22 03:48:17 +0000[diff] [blame]398 <li><a href="http://gcc.gnu.org/onlinedocs/gcc-3.4.0/gcc/Lvalues.html#Lvalues">Lvalues</a>: Using <code>?:</code>, "<code>,</code>" and casts in lvalues.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]399 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Conditionals.html#Conditionals">Conditionals</a>: Omitting the middle operand of a <code>?:</code> expression.</li>
400 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Long-Long.html#Long%20Long">Long Long</a>: Double-word integers.</li>
401 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Complex.html#Complex">Complex</a>: Data types for complex numbers.</li>
402 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Hex-Floats.html#Hex%20Floats">Hex Floats</a>:Hexadecimal floating-point constants.</li>
403 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html#Zero%20Length">Zero Length</a>: Zero-length arrays.</li>
404 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Empty-Structures.html#Empty%20Structures">Empty Structures</a>: Structures with no members.</li>
405 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variadic-Macros.html#Variadic%20Macros">Variadic Macros</a>: Macros with a variable number of arguments.</li>
406 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Escaped-Newlines.html#Escaped%20Newlines">Escaped Newlines</a>: Slightly looser rules for escaped newlines.</li>
407 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Subscripting.html#Subscripting">Subscripting</a>: Any array can be subscripted, even if not an lvalue.</li>
Misha Brukman8395d732003-12-12 04:37:31 +0000[diff] [blame]408 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Pointer-Arith.html#Pointer%20Arith">Pointer Arith</a>: Arithmetic on <code>void</code>-pointers and function pointers.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]409 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Initializers.html#Initializers">Initializers</a>: Non-constant initializers.</li>
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]410 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Compound-Literals.html#Compound%20Literals">Compound Literals</a>: Compound literals give structures, unions,
411or arrays as values.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]412 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Designated-Inits.html#Designated%20Inits">Designated Inits</a>: Labeling elements of initializers.</li>
Misha Brukman8395d732003-12-12 04:37:31 +0000[diff] [blame]413 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Cast-to-Union.html#Cast%20to%20Union">Cast to Union</a>: Casting to union type from any member of the union.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]414 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Case-Ranges.html#Case%20Ranges">Case Ranges</a>: `case 1 ... 9' and such.</li>
415 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Mixed-Declarations.html#Mixed%20Declarations">Mixed Declarations</a>: Mixing declarations and code.</li>
416 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Function-Prototypes.html#Function%20Prototypes">Function Prototypes</a>: Prototype declarations and old-style definitions.</li>
Tanya Lattner7591b822004-12-08 18:29:38 +0000[diff] [blame]417 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/C_002b_002b-Comments.html#C_002b_002b-Comments">C++ Comments</a>: C++ comments are recognized.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]418 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Dollar-Signs.html#Dollar%20Signs">Dollar Signs</a>: Dollar sign is allowed in identifiers.</li>
419 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Character-Escapes.html#Character%20Escapes">Character Escapes</a>: <code>\e</code> stands for the character &lt;ESC&gt;.</li>
420 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Alignment.html#Alignment">Alignment</a>: Inquiring about the alignment of a type or variable.</li>
421 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Inline.html#Inline">Inline</a>: Defining inline functions (as fast as macros).</li>
422 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Alternate-Keywords.html#Alternate%20Keywords">Alternate Keywords</a>:<code>__const__</code>, <code>__asm__</code>, etc., for header files.</li>
423 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Incomplete-Enums.html#Incomplete%20Enums">Incomplete Enums</a>: <code>enum foo;</code>, with details to follow.</li>
424 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Function-Names.html#Function%20Names">Function Names</a>: Printable strings which are the name of the current function.</li>
Chris Lattner3646dad2004-02-14 04:08:29 +0000[diff] [blame]425 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Return-Address.html#Return%20Address">Return Address</a>: Getting the return or frame address of a function.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]426 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Unnamed-Fields.html#Unnamed%20Fields">Unnamed Fields</a>: Unnamed struct/union fields within structs/unions.</li>
427 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Attribute-Syntax.html#Attribute%20Syntax">Attribute Syntax</a>: Formal syntax for attributes.</li>
Misha Brukman7cb4e382003-11-22 01:00:11 +0000[diff] [blame]428 </ol></li>
429
430</ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]431
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]432<p>If you run into GCC extensions which have not been included in any of these
433lists, please let us know (also including whether or not they work).</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]434
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]435</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]436
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]437<!-- ======================================================================= -->
438<div class="doc_subsection">
439 <a name="c++-fe">Known problems with the C++ front-end</a>
440</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]441
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]442<div class="doc_text">
443
Reid Spencer55684c32004-12-07 08:39:08 +0000[diff] [blame]444<p>For this release, the C++ front-end is considered to be fully
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]445tested and works for a number of non-trivial programs, including LLVM
446itself.</p>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]447
448</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]449
450<!-- _______________________________________________________________________ -->
Chris Lattner141ebb62004-02-14 04:12:41 +0000[diff] [blame]451<div class="doc_subsubsection">Bugs</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]452
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]453<div class="doc_text">
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]454
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]455<ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]456<li>The C++ front-end inherits all problems afflicting the <a href="#c-fe">C
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]457 front-end</a>.</li>
Chris Lattner041e6c92004-07-17 02:04:41 +0000[diff] [blame]458
Chris Lattner5cd40922004-08-02 20:28:44 +0000[diff] [blame]459<li><b>IA-64 specific</b>: The C++ front-end does not use <a
460href="http://llvm.cs.uiuc.edu/PR406">IA64 ABI compliant layout of v-tables</a>.
Chris Lattner041e6c92004-07-17 02:04:41 +0000[diff] [blame]461In particular, it just stores function pointers instead of function
462descriptors in the vtable. This bug prevents mixing C++ code compiled with
Chris Lattner2fd93492004-08-02 20:29:51 +0000[diff] [blame]463LLVM with C++ objects compiled by other C++ compilers.</li>
Chris Lattner041e6c92004-07-17 02:04:41 +0000[diff] [blame]464
Chris Lattner5cd40922004-08-02 20:28:44 +0000[diff] [blame]465</ul>
466
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]467</div>
468
469<!-- _______________________________________________________________________ -->
470<div class="doc_subsubsection">
471 Notes
472</div>
473
474<div class="doc_text">
475
476<ul>
Chris Lattnerd2a74272003-10-27 18:30:37 +0000[diff] [blame]477
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]478<li>The C++ front-end is based on a pre-release of the GCC 3.4 C++ parser. This
479parser is significantly more standards compliant (and picky) than prior GCC
480versions. For more information, see the C++ section of the <a
Chris Lattnere76e9ab2003-12-12 04:25:33 +0000[diff] [blame]481href="http://gcc.gnu.org/gcc-3.4/changes.html">GCC 3.4 release notes</a>.</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]482
483<li>Destructors for local objects are not always run when a <tt>longjmp</tt> is
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]484 performed. In particular, destructors for objects in the <tt>longjmp</tt>ing
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]485 function and in the <tt>setjmp</tt> receiver function may not be run.
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]486 Objects in intervening stack frames will be destroyed, however (which is
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]487 better than most compilers).</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]488
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]489<li>The LLVM C++ front-end follows the <a
490 href="http://www.codesourcery.com/cxx-abi">Itanium C++ ABI</a>.
491 This document, which is not Itanium specific, specifies a standard for name
492 mangling, class layout, v-table layout, RTTI formats, and other C++
493 representation issues. Because we use this API, code generated by the LLVM
494 compilers should be binary compatible with machine code generated by other
495 Itanium ABI C++ compilers (such as G++, the Intel and HP compilers, etc).
496 <i>However</i>, the exception handling mechanism used by LLVM is very
497 different from the model used in the Itanium ABI, so <b>exceptions will not
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]498 interact correctly</b>. </li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]499
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]500</ul>
Chris Lattner46ecf612003-10-07 22:14:37 +0000[diff] [blame]501
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]502</div>
503
504<!-- ======================================================================= -->
505<div class="doc_subsection">
506 <a name="x86-be">Known problems with the X86 back-end</a>
507</div>
508
509<div class="doc_text">
510
511<ul>
Chris Lattner5cd40922004-08-02 20:28:44 +0000[diff] [blame]512 <li>none yet</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]513</ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]514
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]515</div>
516
517<!-- ======================================================================= -->
518<div class="doc_subsection">
Misha Brukmana516e992004-07-12 16:55:41 +0000[diff] [blame]519 <a name="sparcv9-be">Known problems with the SparcV9 back-end</a>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]520</div>
521
522<div class="doc_text">
523
524<ul>
Misha Brukmana516e992004-07-12 16:55:41 +0000[diff] [blame]525<li><a href="http://llvm.cs.uiuc.edu/PR60">[sparcv9] SparcV9 backend miscompiles
526several programs in the LLVM test suite</a></li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]527</ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]528
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]529</div>
530
531<!-- ======================================================================= -->
532<div class="doc_subsection">
Chris Lattnerdf925ce2004-11-07 01:55:32 +0000[diff] [blame]533 <a name="ppc-be">Known problems with the PowerPC back-end</a>
534</div>
535
536<div class="doc_text">
537
538<ul>
539<li>none yet</li>
540</ul>
541
542</div>
543
544<!-- ======================================================================= -->
545<div class="doc_subsection">
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]546 <a name="c-be">Known problems with the C back-end</a>
547</div>
548
549<div class="doc_text">
550
551<ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]552
553<li>The C back-end produces code that violates the ANSI C Type-Based Alias
554Analysis rules. As such, special options may be necessary to compile the code
555(for example, GCC requires the <tt>-fno-strict-aliasing</tt> option). This
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]556problem probably cannot be fixed.</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]557
Chris Lattnerc679fbb2003-11-04 20:06:53 +0000[diff] [blame]558<li><a href="http://llvm.cs.uiuc.edu/PR56">Zero arg vararg functions are not
Chris Lattnerb28c3282003-10-24 04:03:19 +0000[diff] [blame]559supported</a>. This should not affect LLVM produced by the C or C++
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]560frontends.</li>
Chris Lattnerb28c3282003-10-24 04:03:19 +0000[diff] [blame]561
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]562</ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]563
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]564</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]565
566<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]567<div class="doc_section">
568 <a name="additionalinfo">Additional Information</a>
569</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]570<!-- *********************************************************************** -->
571
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]572<div class="doc_text">
573
574<p>A wide variety of additional information is available on the LLVM web page,
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]575including mailing lists and publications describing algorithms and components
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]576implemented in LLVM. The web page also contains versions of the API
577documentation which is up-to-date with the CVS version of the source code. You
578can access versions of these documents specific to this release by going into
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]579the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]580
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]581<p>If you have any questions or comments about LLVM, please feel free to contact
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]582us via the <a href="http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev">mailing
583lists</a>.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]584
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]585</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]586
587<!-- *********************************************************************** -->
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]588
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]589<hr>
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]590<address>
Misha Brukman8834af92003-12-21 22:53:21 +0000[diff] [blame]591 <a href="http://jigsaw.w3.org/css-validator/check/referer"><img
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595
Misha Brukman7cb4e382003-11-22 01:00:11 +0000[diff] [blame]596 <a href="http://llvm.cs.uiuc.edu">The LLVM Compiler Infrastructure</a><br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]597 Last modified: $Date$
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]598</address>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]599
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]600</body>
601</html>