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gerrit-public.fairphone.software / fp2-dev / platform / external / llvm / 7939b7817088c2939c4ff434af1ef9f4f8505eba / . / docs / ReleaseNotes.html
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Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
2 "http://www.w3.org/TR/html4/strict.dtd">
3<html>
4<head>
Reid Spencer6454ed32004-11-18 18:38:58 +0000[diff] [blame]5 <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]6 <link rel="stylesheet" href="llvm.css" type="text/css">
Chris Lattner78bf32b2004-12-09 22:22:58 +0000[diff] [blame]7 <title>LLVM 1.5 Release Notes</title>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]8</head>
9<body>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]10
Chris Lattner78bf32b2004-12-09 22:22:58 +0000[diff] [blame]11<div class="doc_title">LLVM 1.5 Release Notes</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]12
13<ol>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]14 <li><a href="#intro">Introduction</a></li>
15 <li><a href="#whatsnew">What's New?</a></li>
Chris Lattner4b538b92004-04-30 22:17:12 +0000[diff] [blame]16 <li><a href="GettingStarted.html">Installation Instructions</a></li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]17 <li><a href="#portability">Portability and Supported Platforms</a></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]18 <li><a href="#knownproblems">Known Problems</a>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]19 <li><a href="#additionalinfo">Additional Information</a></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]20</ol>
21
Chris Lattner7911ce22004-05-23 21:07:27 +0000[diff] [blame]22<div class="doc_author">
Chris Lattner78bf32b2004-12-09 22:22:58 +0000[diff] [blame]23 <p>Written by the <a href="http://llvm.cs.uiuc.edu">LLVM Team</a><p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]24</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]25
26<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]27<div class="doc_section">
28 <a name="intro">Introduction</a>
29</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]30<!-- *********************************************************************** -->
31
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]32<div class="doc_text">
33
34<p>This document contains the release notes for the LLVM compiler
Chris Lattner78bf32b2004-12-09 22:22:58 +0000[diff] [blame]35infrastructure, release 1.5. Here we describe the status of LLVM, including any
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame]36known problems and improvements from the previous release. The most up-to-date
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]37version of this document can be found on the <a
Chris Lattner78bf32b2004-12-09 22:22:58 +0000[diff] [blame]38href="http://llvm.cs.uiuc.edu/releases/1.5/">LLVM 1.5 web site</a>. If you are
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]39not reading this on the LLVM web pages, you should probably go there because
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]40this document may be updated after the release.</p>
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]41
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame]42<p>For more information about LLVM, including information about the latest
43release, please check out the <a href="http://llvm.cs.uiuc.edu">main LLVM
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]44web site</a>. If you have questions or comments, the <a
45href="http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVM developer's mailing
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]46list</a> is a good place to send them.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]47
Chris Lattner78bf32b2004-12-09 22:22:58 +0000[diff] [blame]48<p>Note that if you are reading this file from CVS or the main LLVM web page,
49this document applies to the <i>next</i> release, not the current one. To see
50the release notes for the current or previous releases, see the <a
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]51href="http://llvm.cs.uiuc.edu/releases/">releases page</a>.</p>
52
53</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]54
55<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]56<div class="doc_section">
57 <a name="whatsnew">What's New?</a>
58</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]59<!-- *********************************************************************** -->
60
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]61<div class="doc_text">
62
Chris Lattner78bf32b2004-12-09 22:22:58 +0000[diff] [blame]63<p>This is the sixth public release of the LLVM compiler infrastructure.</p>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]64
Chris Lattner0bce6ac2004-12-10 16:27:34 +0000[diff] [blame]65<p> At this time, LLVM is known to correctly compile a broad range of C and
Chris Lattner78bf32b2004-12-09 22:22:58 +0000[diff] [blame]66C++ programs, including the SPEC CPU95 &amp; 2000 suite. TODO. It also includes
67bug fixes for those problems found since the 1.4 release.</p>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]68
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]69</div>
70
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]71<!--=========================================================================-->
72<div class="doc_subsubsection">
Chris Lattnera39719f2004-02-25 16:36:51 +0000[diff] [blame]73<a name="newfeatures">This release implements the following new features:</a>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]74</div>
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]75
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]76<div class="doc_text">
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]77<ol>
Chris Lattner74d74cd2004-12-11 06:10:52 +0000[diff] [blame]78 <li>LLVM now includes an <a href="http://llvm.cs.uiuc.edu/PR415">
Chris Lattnerda1f03c2005-01-22 18:45:35 +0000[diff] [blame]79 Interprocedural Sparse Conditional Constant Propagation</a> pass, named
Chris Lattner74d74cd2004-12-11 06:10:52 +0000[diff] [blame]80 -ipsccp, which is run by default at link-time.</li>
Chris Lattner75008d82005-02-01 01:33:52 +0000[diff] [blame]81 <li>LLVM 1.5 is now about 15% faster than LLVM 1.4 and its core data structures
Chris Lattner2e12c742005-02-13 22:27:24 +0000[diff] [blame]82 use about 30% less memory.</li>
Misha Brukman89976ff2005-03-18 00:48:56 +0000[diff] [blame]83 <li>LLVM includes new experimental native code generators for SparcV8,
84 Alpha, and IA64.</li>
Chris Lattner2e12c742005-02-13 22:27:24 +0000[diff] [blame]85 <li>Support for Microsoft Visual Studio is improved, and <a
Chris Lattnera5d803e2005-02-14 22:58:38 +0000[diff] [blame]86 href="GettingStartedVS.html">now documented</a>.</li>
Reid Spencer2ebdb532005-04-22 20:27:33 +0000[diff] [blame]87 <li>Configuring LLVM to build targets selectively is now implemented, via the
88 <tt>--enable-targets=</tt> option. This feature is documented
89 <a href="GettingStarted.html#config">here</a>.</li>
Chris Lattner8cdc5bc2005-05-06 23:08:23 +0000[diff] [blame]90 <li>LLVM now supports <a href="LangRef.html#callingconv">custom and
91 target-specific calling conventions</a>.</li>
Chris Lattner55ee0312003-11-19 22:05:38 +0000[diff] [blame]92</ol>
Chris Lattner0ef19062003-11-08 04:28:55 +0000[diff] [blame]93
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]94</div>
95
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]96
97<!--=========================================================================-->
98<div class="doc_subsubsection">
99In this release, the following missing features were implemented:
100</div>
Chris Lattner0ef19062003-11-08 04:28:55 +0000[diff] [blame]101
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]102<div class="doc_text">
103
Chris Lattner0ef19062003-11-08 04:28:55 +0000[diff] [blame]104<ol>
Chris Lattnerd7934542005-02-28 16:52:28 +0000[diff] [blame]105 <li>LLVM can now create native shared libraries with '<tt>llvm-gcc ...
106 -shared -Wl,-native</tt>' (or with <tt>-Wl,-native-cbe</tt>).</li>
Chris Lattnerd03b3bc2005-03-11 06:16:26 +0000[diff] [blame]107 <li>LLVM now supports a new "<a href="LangRef.html#i_prefetch">llvm.prefetch
108 </a>" intrinsic, and llvm-gcc now supports __builtin_prefetch.
Chris Lattner7939b782005-05-07 02:21:21 +0000[diff] [blame^]109 <li>LLVM now supports intrinsics for <a href="LangRef.html#int_count">bit
110 counting</a> and llvm-gcc now implements the GCC
111 <tt>__builtin_popcount</tt>, <tt>__builtin_ctz</tt>, and
112 <tt>__builtin_clz</tt> builtins.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]113</ol>
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]114
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]115</div>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]116
117<!--=========================================================================-->
118<div class="doc_subsubsection">
Misha Brukmana7aadf12004-04-19 02:56:49 +0000[diff] [blame]119<a name="qualityofimp">In this release, the following Quality of Implementation
120issues were fixed:</a>
Chris Lattnere29ac162003-12-20 03:42:11 +0000[diff] [blame]121</div>
122
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]123<div class="doc_text">
124
Chris Lattnere29ac162003-12-20 03:42:11 +0000[diff] [blame]125<ol>
Chris Lattnerda1f03c2005-01-22 18:45:35 +0000[diff] [blame]126 <li><a href="http://llvm.cs.uiuc.edu/PR448">Building LLVM in optimized mode
127 should no longer cause GCC to hit swap in the PowerPC backend.</a></li>
Brian Gaeke6b31beb2004-01-16 21:55:04 +0000[diff] [blame]128</ol>
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]129</div>
Brian Gaeke6b31beb2004-01-16 21:55:04 +0000[diff] [blame]130
131<!--=========================================================================-->
132<div class="doc_subsubsection">
Chris Lattner6e1ef192004-05-02 04:19:15 +0000[diff] [blame]133<a name="codequality">This release includes the following Code Quality
134improvements:</a>
Chris Lattneraab56d42004-05-23 20:42:08 +0000[diff] [blame]135</div>
Chris Lattner89ca2b82003-10-27 17:06:39 +0000[diff] [blame]136
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]137<div class="doc_text">
Chris Lattner89ca2b82003-10-27 17:06:39 +0000[diff] [blame]138<ol>
Andrew Lenharth30a1f8f2005-05-03 16:59:09 +0000[diff] [blame]139 <li>Transition code for 1.0 style varargs was removed. </li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]140</ol>
Reid Spencer8e0262f2004-05-23 17:23:13 +0000[diff] [blame]141</div>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]142
143<!--=========================================================================-->
144<div class="doc_subsubsection">
Misha Brukmana7aadf12004-04-19 02:56:49 +0000[diff] [blame]145<a name="bugfix">In this release, the following bugs in the previous release
146were fixed:</a>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]147</div>
148
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]149<div class="doc_text">
150
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]151
Chris Lattnerf54e9cb2005-02-14 16:57:55 +0000[diff] [blame]152<p>Bugs fixed in the LLVM Core:</p>
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]153<ol>
Chris Lattnerbfd24682004-12-29 04:39:50 +0000[diff] [blame]154 <li><a href="http://llvm.cs.uiuc.edu/PR491">[dse] DSE deletes stores that
155 are partially overwritten by smaller stores</a></li>
Chris Lattnerf79e57e2005-04-19 06:08:04 +0000[diff] [blame]156 <li><a href="http://llvm.cs.uiuc.edu/PR548">[instcombine] miscompilation of
157 setcc or setcc in one case</a></li>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]158</ol>
159
Chris Lattnerf54e9cb2005-02-14 16:57:55 +0000[diff] [blame]160<p>Code Generator Bugs:</p>
161<ol>
162 <li><a href="http://llvm.cs.uiuc.edu/PR490">[cbackend] Logical constant
163 expressions (and/or/xor) not implemented</a></li>
164 <li><a href="http://llvm.cs.uiuc.edu/PR511">[cbackend] C backend does not
165 respect 'volatile'</a></li>
166</ol>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]167
Chris Lattnerf54e9cb2005-02-14 16:57:55 +0000[diff] [blame]168<p>Bugs in the C/C++ front-end:</p>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]169<ol>
Chris Lattner8de9f232005-01-03 04:20:21 +0000[diff] [blame]170 <li><a href="http://llvm.cs.uiuc.edu/PR487">[llvmgcc] llvm-gcc incorrectly
171 rejects some constant initializers involving the addresses of array
172 elements</a></li>
Chris Lattnerf832f6a2005-02-11 19:29:52 +0000[diff] [blame]173 <li><a href="http://llvm.cs.uiuc.edu/PR501">[llvm-g++] Crash compiling
174 anonymous union</a></li>
Chris Lattnerf54e9cb2005-02-14 16:57:55 +0000[diff] [blame]175 <li><a href="http://llvm.cs.uiuc.edu/PR509">[llvm-g++] Do not use dynamic
176 initialization where static init will do</a></li>
Chris Lattner4a9dc292005-02-15 05:28:06 +0000[diff] [blame]177 <li><a href="http://llvm.cs.uiuc.edu/PR510">[llvmgcc] Field offset
178 miscalculated for some structure fields following bit fields</a></li>
Chris Lattner5ad907a2005-02-15 07:02:12 +0000[diff] [blame]179 <li><a href="http://llvm.cs.uiuc.edu/PR513">[llvm-g++] Temporary lifetimes
180 incorrect for short circuit logical operations</a></li>
Chris Lattnerc1f90a92005-02-19 07:29:25 +0000[diff] [blame]181 <li><a href="http://llvm.cs.uiuc.edu/PR517">[llvm-gcc] Crash compiling
182 bitfield &lt;-&gt; aggregate assignment</a></li>
Chris Lattner94f6ac72005-02-19 17:13:20 +0000[diff] [blame]183 <li><a href="http://llvm.cs.uiuc.edu/PR520">[llvm-g++] Error compiling
Chris Lattnerd12b9b22005-02-19 17:17:32 +0000[diff] [blame]184 virtual function thunk with an unnamed argument</a></li>
Chris Lattner290d2292005-02-20 23:31:49 +0000[diff] [blame]185 <li><a href="http://llvm.cs.uiuc.edu/PR522">[llvm-gcc] Crash on certain
186 C99 complex number routines</a></li>
Chris Lattner2a3cdf72005-02-27 19:31:02 +0000[diff] [blame]187 <li><a href="http://llvm.cs.uiuc.edu/PR529">[llvm-g++] Crash using placement
188 new on an array type</a></li>
Brian Gaekee77c8e72004-08-24 07:43:48 +0000[diff] [blame]189</ol>
190
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]191</div>
Reid Spencer8e0262f2004-05-23 17:23:13 +0000[diff] [blame]192
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]193<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]194<div class="doc_section">
195 <a name="portability">Portability and Supported Platforms</a>
196</div>
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]197<!-- *********************************************************************** -->
198
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]199<div class="doc_text">
200
John Criswell0b5b5e92004-12-08 20:35:47 +0000[diff] [blame]201<p>LLVM is known to work on the following platforms:</p>
Chris Lattner4654bdb2004-06-01 18:22:41 +0000[diff] [blame]202
203<ul>
204<li>Intel and AMD machines running Red Hat Linux and FreeBSD (and probably
205 other unix-like systems).</li>
206<li>Sun UltraSPARC workstations running Solaris 8.</li>
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame]207<li>Intel and AMD machines running on Win32 with the Cygwin libraries (limited
208 support is available for native builds with Visual C++).</li>
209<li>PowerPC-based Mac OS X systems, running 10.2 and above.</li>
Andrew Lenharth30a1f8f2005-05-03 16:59:09 +0000[diff] [blame]210<li>Alpha-based machines running Debian GNU/Linux</li>
Chris Lattner4654bdb2004-06-01 18:22:41 +0000[diff] [blame]211</ul>
212
Brian Gaekeb0fd7612004-05-09 05:28:35 +0000[diff] [blame]213<p>The core LLVM infrastructure uses
214<a href="http://www.gnu.org/software/autoconf/">GNU autoconf</a> to adapt itself
215to the machine and operating system on which it is built. However, minor
216porting may be required to get LLVM to work on new platforms. We welcome your
217portability patches and reports of successful builds or error messages.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]218
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]219</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]220
221<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]222<div class="doc_section">
223 <a name="knownproblems">Known Problems</a>
224</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]225<!-- *********************************************************************** -->
226
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]227<div class="doc_text">
228
229<p>This section contains all known problems with the LLVM system, listed by
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]230component. As new problems are discovered, they will be added to these
Chris Lattner5eccca42003-12-12 21:22:16 +0000[diff] [blame]231sections. If you run into a problem, please check the <a
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]232href="http://llvm.cs.uiuc.edu/bugs/">LLVM bug database</a> and submit a bug if
Chris Lattner5eccca42003-12-12 21:22:16 +0000[diff] [blame]233there isn't already one.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]234
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]235</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]236
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]237<!-- ======================================================================= -->
238<div class="doc_subsection">
239 <a name="experimental">Experimental features included with this release</a>
240</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]241
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]242<div class="doc_text">
243
Misha Brukman6df9e2c2004-05-12 21:46:05 +0000[diff] [blame]244<p>The following components of this LLVM release are either untested, known to
245be broken or unreliable, or are in early development. These components should
246not be relied on, and bugs should not be filed against them, but they may be
247useful to some people. In particular, if you would like to work on one of these
248components, please contact us on the llvmdev list.</p>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]249
250<ul>
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame]251<li>The following passes are incomplete or buggy, and may be removed in future
Chris Lattner1fe848e2005-01-28 06:13:52 +0000[diff] [blame]252 releases: <tt>-cee, -branch-combine, -instloops, -paths, -pre</tt></li>
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame]253<li>The <tt>llvm-db</tt> tool is in a very early stage of development, but can
254 be used to step through programs and inspect the stack.</li>
Misha Brukman109d9e82005-03-30 19:14:24 +0000[diff] [blame]255<li>The "iterative scan" register allocator (enabled with
256 <tt>-regalloc=iterativescan</tt>) is not stable.</li>
Misha Brukman89976ff2005-03-18 00:48:56 +0000[diff] [blame]257<li>The SparcV8, Alpha, and IA64 ports are experimental.</li>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]258</ul>
259
260</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]261
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]262<!-- ======================================================================= -->
263<div class="doc_subsection">
264 <a name="core">Known problems with the LLVM Core</a>
265</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]266
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]267<div class="doc_text">
268
269<ul>
Misha Brukman109d9e82005-03-30 19:14:24 +0000[diff] [blame]270 <li>In the JIT, <tt>dlsym()</tt> on a symbol compiled by the JIT will not
271 work.</li>
Reid Spencer4f86f9c2004-11-25 22:38:30 +0000[diff] [blame]272 <li>The JIT does not use mutexes to protect its internal data structures. As
273 such, execution of a threaded program could cause these data structures to be
274 corrupted.
275 </li>
Reid Spencer4f86f9c2004-11-25 22:38:30 +0000[diff] [blame]276 <li><a href="http://llvm.cs.uiuc.edu/PR240">The lower-invoke pass does not
277 mark values live across a setjmp as volatile</a>. This missing feature
278 only affects targets whose setjmp/longjmp libraries do not save and restore
279 the entire register file.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]280</ul>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]281</div>
282
283<!-- ======================================================================= -->
284<div class="doc_subsection">
285 <a name="c-fe">Known problems with the C front-end</a>
286</div>
Chris Lattner47588f92003-10-02 05:07:23 +0000[diff] [blame]287
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]288<!-- _______________________________________________________________________ -->
Chris Lattnerb40efb32003-12-14 05:03:43 +0000[diff] [blame]289<div class="doc_subsubsection">Bugs</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]290
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]291<div class="doc_text">
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]292<ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]293<li>C99 Variable sized arrays do not release stack memory when they go out of
294 scope. Thus, the following program may run out of stack space:
295<pre>
296 for (i = 0; i != 1000000; ++i) {
297 int X[n];
298 foo(X);
299 }
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]300</pre></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]301
Misha Brukman6df9e2c2004-05-12 21:46:05 +0000[diff] [blame]302<li>Initialization of global union variables can only be done <a
Misha Brukman43ee2932004-12-04 00:45:09 +0000[diff] [blame]303href="http://llvm.cs.uiuc.edu/PR162">with the largest union member</a>.</li>
Chris Lattnerf580cdc2004-03-16 21:39:04 +0000[diff] [blame]304
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]305</ul>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]306</div>
307
308<!-- _______________________________________________________________________ -->
309<div class="doc_subsubsection">
310 Notes
311</div>
312
313<div class="doc_text">
314
315<ul>
316
317<li>Inline assembly is not yet supported.</li>
Chris Lattnere01fcfb2003-10-27 18:30:37 +0000[diff] [blame]318
319<li>"long double" is transformed by the front-end into "double". There is no
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]320support for floating point data types of any size other than 32 and 64
321bits.</li>
322
323<li>The following Unix system functionality has not been tested and may not
324work:
Misha Brukmane0c891c2003-11-22 01:00:11 +0000[diff] [blame]325 <ol>
326 <li><tt>sigsetjmp</tt>, <tt>siglongjmp</tt> - These are not turned into the
327 appropriate <tt>invoke</tt>/<tt>unwind</tt> instructions. Note that
328 <tt>setjmp</tt> and <tt>longjmp</tt> <em>are</em> compiled correctly.
329 <li><tt>getcontext</tt>, <tt>setcontext</tt>, <tt>makecontext</tt>
330 - These functions have not been tested.
331 </ol></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]332
333<li>Although many GCC extensions are supported, some are not. In particular,
334 the following extensions are known to <b>not be</b> supported:
335 <ol>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]336 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Local-Labels.html#Local%20Labels">Local Labels</a>: Labels local to a block.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]337 <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>
338 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Constructing-Calls.html#Constructing%20Calls">Constructing Calls</a>: Dispatching a call to another function.</li>
339 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Extended-Asm.html#Extended%20Asm">Extended Asm</a>: Assembler instructions with C expressions as operands.</li>
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]340 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Constraints.html#Constraints">Constraints</a>: Constraints for asm operands.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]341 <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>
342 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Explicit-Reg-Vars.html#Explicit%20Reg%20Vars">Explicit Reg Vars</a>: Defining variables residing in specified registers.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]343 <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>
344 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Target-Builtins.html#Target%20Builtins">Target Builtins</a>: Built-in functions specific to particular targets.</li>
Tanya Lattner014e5f52004-12-08 18:25:34 +0000[diff] [blame]345 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Thread_002dLocal.html">Thread-Local</a>: Per-thread variables.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]346 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Pragmas.html#Pragmas">Pragmas</a>: Pragmas accepted by GCC.</li>
Misha Brukmane0c891c2003-11-22 01:00:11 +0000[diff] [blame]347 </ol>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]348
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]349 <p>The following GCC extensions are <b>partially</b> supported. An ignored
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]350 attribute means that the LLVM compiler ignores the presence of the attribute,
351 but the code should still work. An unsupported attribute is one which is
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]352 ignored by the LLVM compiler and will cause a different interpretation of
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]353 the program.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]354
355 <ol>
356 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Length.html#Variable%20Length">Variable Length</a>:
357 Arrays whose length is computed at run time.<br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]358 Supported, but allocated stack space is not freed until the function returns (noted above).</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]359
360 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html#Function%20Attributes">Function Attributes</a>:
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]361
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]362 Declaring that functions have no side effects or that they can never
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]363 return.<br>
364
365 <b>Supported:</b> <tt>format</tt>, <tt>format_arg</tt>, <tt>non_null</tt>,
John Criswell0b5b5e92004-12-08 20:35:47 +0000[diff] [blame]366 <tt>noreturn</tt>, <tt>constructor</tt>, <tt>destructor</tt>,
367 <tt>unused</tt>,
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]368 <tt>deprecated</tt>, <tt>warn_unused_result</tt>, <tt>weak</tt><br>
369
John Criswell0b5b5e92004-12-08 20:35:47 +0000[diff] [blame]370 <b>Ignored:</b> <tt>noinline</tt>,
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]371 <tt>always_inline</tt>, <tt>pure</tt>, <tt>const</tt>, <tt>nothrow</tt>,
372 <tt>malloc</tt>, <tt>no_instrument_function</tt>, <tt>cdecl</tt><br>
373
374 <b>Unsupported:</b> <tt>used</tt>, <tt>section</tt>, <tt>alias</tt>,
375 <tt>visibility</tt>, <tt>regparm</tt>, <tt>stdcall</tt>,
376 <tt>fastcall</tt>, all other target specific attributes</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]377
378 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Attributes.html#Variable%20Attributes">Variable Attributes</a>:
379 Specifying attributes of variables.<br>
380 <b>Supported:</b> <tt>cleanup</tt>, <tt>common</tt>, <tt>nocommon</tt>,
381 <tt>deprecated</tt>, <tt>transparent_union</tt>,
382 <tt>unused</tt>, <tt>weak</tt><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]383
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]384 <b>Unsupported:</b> <tt>aligned</tt>, <tt>mode</tt>, <tt>packed</tt>,
385 <tt>section</tt>, <tt>shared</tt>, <tt>tls_model</tt>,
386 <tt>vector_size</tt>, <tt>dllimport</tt>,
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]387 <tt>dllexport</tt>, all target specific attributes.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]388
Misha Brukmanc4b7bee2003-12-12 04:37:31 +0000[diff] [blame]389 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Type-Attributes.html#Type%20Attributes">Type Attributes</a>: Specifying attributes of types.<br>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]390 <b>Supported:</b> <tt>transparent_union</tt>, <tt>unused</tt>,
Misha Brukmanc4b7bee2003-12-12 04:37:31 +0000[diff] [blame]391 <tt>deprecated</tt>, <tt>may_alias</tt><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]392
393 <b>Unsupported:</b> <tt>aligned</tt>, <tt>packed</tt>,
394 all target specific attributes.</li>
395
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]396 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html#Other%20Builtins">Other Builtins</a>:
397 Other built-in functions.<br>
398 We support all builtins which have a C language equivalent (e.g.,
399 <tt>__builtin_cos</tt>), <tt>__builtin_alloca</tt>,
400 <tt>__builtin_types_compatible_p</tt>, <tt>__builtin_choose_expr</tt>,
Chris Lattnerceebeb62004-06-18 06:26:29 +0000[diff] [blame]401 <tt>__builtin_constant_p</tt>, and <tt>__builtin_expect</tt>
402 (currently ignored). We also support builtins for ISO C99 floating
Chris Lattner7939b782005-05-07 02:21:21 +0000[diff] [blame^]403 point comparison macros (e.g., <tt>__builtin_islessequal</tt>),
404 <tt>__builtin_prefetch</tt>, <tt>__builtin_popcount[ll]</tt>,
405 <tt>__builtin_clz[ll]</tt>, and <tt>__builtin_ctz[ll]</tt>.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]406 </ol>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]407
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]408 <p>The following extensions <b>are</b> known to be supported:</p>
409
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]410 <ol>
Chris Lattner7fe97dd2004-03-16 08:54:07 +0000[diff] [blame]411 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Labels-as-Values.html#Labels%20as%20Values">Labels as Values</a>: Getting pointers to labels and computed gotos.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]412 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html#Statement%20Exprs">Statement Exprs</a>: Putting statements and declarations inside expressions.</li>
413 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Typeof.html#Typeof">Typeof</a>: <code>typeof</code>: referring to the type of an expression.</li>
Tanya Lattnerca26c3e2004-06-22 03:48:17 +0000[diff] [blame]414 <li><a href="http://gcc.gnu.org/onlinedocs/gcc-3.4.0/gcc/Lvalues.html#Lvalues">Lvalues</a>: Using <code>?:</code>, "<code>,</code>" and casts in lvalues.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]415 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Conditionals.html#Conditionals">Conditionals</a>: Omitting the middle operand of a <code>?:</code> expression.</li>
416 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Long-Long.html#Long%20Long">Long Long</a>: Double-word integers.</li>
417 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Complex.html#Complex">Complex</a>: Data types for complex numbers.</li>
418 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Hex-Floats.html#Hex%20Floats">Hex Floats</a>:Hexadecimal floating-point constants.</li>
419 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html#Zero%20Length">Zero Length</a>: Zero-length arrays.</li>
420 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Empty-Structures.html#Empty%20Structures">Empty Structures</a>: Structures with no members.</li>
421 <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>
422 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Escaped-Newlines.html#Escaped%20Newlines">Escaped Newlines</a>: Slightly looser rules for escaped newlines.</li>
423 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Subscripting.html#Subscripting">Subscripting</a>: Any array can be subscripted, even if not an lvalue.</li>
Misha Brukmanc4b7bee2003-12-12 04:37:31 +0000[diff] [blame]424 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Pointer-Arith.html#Pointer%20Arith">Pointer Arith</a>: Arithmetic on <code>void</code>-pointers and function pointers.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]425 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Initializers.html#Initializers">Initializers</a>: Non-constant initializers.</li>
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]426 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Compound-Literals.html#Compound%20Literals">Compound Literals</a>: Compound literals give structures, unions,
427or arrays as values.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]428 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Designated-Inits.html#Designated%20Inits">Designated Inits</a>: Labeling elements of initializers.</li>
Misha Brukmanc4b7bee2003-12-12 04:37:31 +0000[diff] [blame]429 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Cast-to-Union.html#Cast%20to%20Union">Cast to Union</a>: Casting to union type from any member of the union.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]430 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Case-Ranges.html#Case%20Ranges">Case Ranges</a>: `case 1 ... 9' and such.</li>
431 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Mixed-Declarations.html#Mixed%20Declarations">Mixed Declarations</a>: Mixing declarations and code.</li>
432 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Function-Prototypes.html#Function%20Prototypes">Function Prototypes</a>: Prototype declarations and old-style definitions.</li>
Tanya Lattner78537e42004-12-08 18:29:38 +0000[diff] [blame]433 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/C_002b_002b-Comments.html#C_002b_002b-Comments">C++ Comments</a>: C++ comments are recognized.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]434 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Dollar-Signs.html#Dollar%20Signs">Dollar Signs</a>: Dollar sign is allowed in identifiers.</li>
435 <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>
436 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Alignment.html#Alignment">Alignment</a>: Inquiring about the alignment of a type or variable.</li>
437 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Inline.html#Inline">Inline</a>: Defining inline functions (as fast as macros).</li>
438 <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>
439 <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>
440 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Function-Names.html#Function%20Names">Function Names</a>: Printable strings which are the name of the current function.</li>
Chris Lattner25795bc2004-02-14 04:08:29 +0000[diff] [blame]441 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Return-Address.html#Return%20Address">Return Address</a>: Getting the return or frame address of a function.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]442 <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>
443 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Attribute-Syntax.html#Attribute%20Syntax">Attribute Syntax</a>: Formal syntax for attributes.</li>
Misha Brukmane0c891c2003-11-22 01:00:11 +0000[diff] [blame]444 </ol></li>
445
446</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]447
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]448<p>If you run into GCC extensions which have not been included in any of these
449lists, please let us know (also including whether or not they work).</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]450
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]451</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]452
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]453<!-- ======================================================================= -->
454<div class="doc_subsection">
455 <a name="c++-fe">Known problems with the C++ front-end</a>
456</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]457
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]458<div class="doc_text">
459
Reid Spencere09ca642004-12-07 08:39:08 +0000[diff] [blame]460<p>For this release, the C++ front-end is considered to be fully
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame]461tested and works for a number of non-trivial programs, including LLVM
462itself.</p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]463
464</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]465
466<!-- _______________________________________________________________________ -->
Chris Lattner3a51be12004-02-14 04:12:41 +0000[diff] [blame]467<div class="doc_subsubsection">Bugs</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]468
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]469<div class="doc_text">
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]470
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]471<ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]472<li>The C++ front-end inherits all problems afflicting the <a href="#c-fe">C
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]473 front-end</a>.</li>
Chris Lattner7962f712004-07-17 02:04:41 +0000[diff] [blame]474
Chris Lattnerd5713882004-08-02 20:28:44 +0000[diff] [blame]475<li><b>IA-64 specific</b>: The C++ front-end does not use <a
476href="http://llvm.cs.uiuc.edu/PR406">IA64 ABI compliant layout of v-tables</a>.
Chris Lattner7962f712004-07-17 02:04:41 +0000[diff] [blame]477In particular, it just stores function pointers instead of function
478descriptors in the vtable. This bug prevents mixing C++ code compiled with
Chris Lattner04db8082004-08-02 20:29:51 +0000[diff] [blame]479LLVM with C++ objects compiled by other C++ compilers.</li>
Chris Lattner7962f712004-07-17 02:04:41 +0000[diff] [blame]480
Chris Lattnerd5713882004-08-02 20:28:44 +0000[diff] [blame]481</ul>
482
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]483</div>
484
485<!-- _______________________________________________________________________ -->
486<div class="doc_subsubsection">
487 Notes
488</div>
489
490<div class="doc_text">
491
492<ul>
Chris Lattnere01fcfb2003-10-27 18:30:37 +0000[diff] [blame]493
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]494<li>The C++ front-end is based on a pre-release of the GCC 3.4 C++ parser. This
495parser is significantly more standards compliant (and picky) than prior GCC
496versions. For more information, see the C++ section of the <a
Chris Lattner9e848092003-12-12 04:25:33 +0000[diff] [blame]497href="http://gcc.gnu.org/gcc-3.4/changes.html">GCC 3.4 release notes</a>.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]498
499<li>Destructors for local objects are not always run when a <tt>longjmp</tt> is
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]500 performed. In particular, destructors for objects in the <tt>longjmp</tt>ing
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]501 function and in the <tt>setjmp</tt> receiver function may not be run.
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]502 Objects in intervening stack frames will be destroyed, however (which is
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]503 better than most compilers).</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]504
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]505<li>The LLVM C++ front-end follows the <a
506 href="http://www.codesourcery.com/cxx-abi">Itanium C++ ABI</a>.
507 This document, which is not Itanium specific, specifies a standard for name
508 mangling, class layout, v-table layout, RTTI formats, and other C++
509 representation issues. Because we use this API, code generated by the LLVM
510 compilers should be binary compatible with machine code generated by other
511 Itanium ABI C++ compilers (such as G++, the Intel and HP compilers, etc).
512 <i>However</i>, the exception handling mechanism used by LLVM is very
513 different from the model used in the Itanium ABI, so <b>exceptions will not
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]514 interact correctly</b>. </li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]515
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]516</ul>
Chris Lattnerfcc54b32003-10-07 22:14:37 +0000[diff] [blame]517
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]518</div>
519
520<!-- ======================================================================= -->
521<div class="doc_subsection">
522 <a name="x86-be">Known problems with the X86 back-end</a>
523</div>
524
525<div class="doc_text">
526
527<ul>
Chris Lattnerd5713882004-08-02 20:28:44 +0000[diff] [blame]528 <li>none yet</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]529</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]530
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]531</div>
532
533<!-- ======================================================================= -->
534<div class="doc_subsection">
Misha Brukmanadb1c392004-07-12 16:55:41 +0000[diff] [blame]535 <a name="sparcv9-be">Known problems with the SparcV9 back-end</a>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]536</div>
537
538<div class="doc_text">
539
540<ul>
Misha Brukmanadb1c392004-07-12 16:55:41 +0000[diff] [blame]541<li><a href="http://llvm.cs.uiuc.edu/PR60">[sparcv9] SparcV9 backend miscompiles
542several programs in the LLVM test suite</a></li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]543</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]544
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]545</div>
546
547<!-- ======================================================================= -->
548<div class="doc_subsection">
Chris Lattnerf32a5f52004-11-07 01:55:32 +0000[diff] [blame]549 <a name="ppc-be">Known problems with the PowerPC back-end</a>
550</div>
551
552<div class="doc_text">
553
554<ul>
555<li>none yet</li>
556</ul>
557
558</div>
559
560<!-- ======================================================================= -->
561<div class="doc_subsection">
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]562 <a name="c-be">Known problems with the C back-end</a>
563</div>
564
565<div class="doc_text">
566
567<ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]568
569<li>The C back-end produces code that violates the ANSI C Type-Based Alias
570Analysis rules. As such, special options may be necessary to compile the code
571(for example, GCC requires the <tt>-fno-strict-aliasing</tt> option). This
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]572problem probably cannot be fixed.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]573
Chris Lattner2855ecd2003-11-04 20:06:53 +0000[diff] [blame]574<li><a href="http://llvm.cs.uiuc.edu/PR56">Zero arg vararg functions are not
Chris Lattner2af46052003-10-24 04:03:19 +0000[diff] [blame]575supported</a>. This should not affect LLVM produced by the C or C++
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]576frontends.</li>
Chris Lattner2af46052003-10-24 04:03:19 +0000[diff] [blame]577
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]578</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]579
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]580</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]581
Andrew Lenharth30a1f8f2005-05-03 16:59:09 +0000[diff] [blame]582<!-- ======================================================================= -->
583<div class="doc_subsection">
584 <a name="alpha-be">Known problems with the Alpha back-end</a>
585</div>
586
587<div class="doc_text">
588
589<ul>
590
591<li>On 21164s, some rare FP arithmatic sequences which may trap do not have the appropriate nops inserted to ensure restartability.</li>
592
593<li>Vararg functions are not supported.</li>
594
595</ul>
596
597</div>
598
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]599<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]600<div class="doc_section">
601 <a name="additionalinfo">Additional Information</a>
602</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]603<!-- *********************************************************************** -->
604
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]605<div class="doc_text">
606
607<p>A wide variety of additional information is available on the LLVM web page,
Misha Brukman109d9e82005-03-30 19:14:24 +0000[diff] [blame]608including <a href="http://llvm.cs.uiuc.edu/docs/#maillist">mailing lists</a> and
609<a href="http://llvm.cs.uiuc.edu/pubs/">publications describing algorithms and
610components implemented in LLVM</a>. The web page also contains versions of the
611API documentation which is up-to-date with the CVS version of the source code.
612You can access versions of these documents specific to this release by going
613into the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]614
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]615<p>If you have any questions or comments about LLVM, please feel free to contact
Chris Lattner5eccca42003-12-12 21:22:16 +0000[diff] [blame]616us via the <a href="http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev">mailing
617lists</a>.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]618
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]619</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]620
621<!-- *********************************************************************** -->
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]622
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]623<hr>
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]624<address>
Misha Brukman38847d52003-12-21 22:53:21 +0000[diff] [blame]625 <a href="http://jigsaw.w3.org/css-validator/check/referer"><img
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]626 src="http://jigsaw.w3.org/css-validator/images/vcss" alt="Valid CSS!"></a>
627 <a href="http://validator.w3.org/check/referer"><img
628 src="http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01!" /></a>
629
Misha Brukmane0c891c2003-11-22 01:00:11 +0000[diff] [blame]630 <a href="http://llvm.cs.uiuc.edu">The LLVM Compiler Infrastructure</a><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]631 Last modified: $Date$
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]632</address>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]633
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]634</body>
635</html>