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gerrit-public.fairphone.software / fp2-dev / platform / external / llvm / 2e36d6ecb41be03ddbd33101de82dc640045fd1c / . / 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>
John Criswell9321fa82005-05-13 20:28:15 +0000[diff] [blame]210<li>Alpha-based machines running Debian GNU/Linux.</li>
211<li>Itanium-based machines running Linux and HP-UX.</li>
Chris Lattner4654bdb2004-06-01 18:22:41 +0000[diff] [blame]212</ul>
213
Brian Gaekeb0fd7612004-05-09 05:28:35 +0000[diff] [blame]214<p>The core LLVM infrastructure uses
215<a href="http://www.gnu.org/software/autoconf/">GNU autoconf</a> to adapt itself
216to the machine and operating system on which it is built. However, minor
217porting may be required to get LLVM to work on new platforms. We welcome your
218portability patches and reports of successful builds or error messages.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]219
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]220</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]221
222<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]223<div class="doc_section">
224 <a name="knownproblems">Known Problems</a>
225</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]226<!-- *********************************************************************** -->
227
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]228<div class="doc_text">
229
230<p>This section contains all known problems with the LLVM system, listed by
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]231component. As new problems are discovered, they will be added to these
Chris Lattner5eccca42003-12-12 21:22:16 +0000[diff] [blame]232sections. If you run into a problem, please check the <a
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]233href="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]234there isn't already one.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]235
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]236</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]237
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]238<!-- ======================================================================= -->
239<div class="doc_subsection">
240 <a name="experimental">Experimental features included with this release</a>
241</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]242
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]243<div class="doc_text">
244
Misha Brukman6df9e2c2004-05-12 21:46:05 +0000[diff] [blame]245<p>The following components of this LLVM release are either untested, known to
246be broken or unreliable, or are in early development. These components should
247not be relied on, and bugs should not be filed against them, but they may be
248useful to some people. In particular, if you would like to work on one of these
249components, please contact us on the llvmdev list.</p>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]250
251<ul>
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame]252<li>The following passes are incomplete or buggy, and may be removed in future
Chris Lattner1fe848e2005-01-28 06:13:52 +0000[diff] [blame]253 releases: <tt>-cee, -branch-combine, -instloops, -paths, -pre</tt></li>
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame]254<li>The <tt>llvm-db</tt> tool is in a very early stage of development, but can
255 be used to step through programs and inspect the stack.</li>
Misha Brukman109d9e82005-03-30 19:14:24 +0000[diff] [blame]256<li>The "iterative scan" register allocator (enabled with
257 <tt>-regalloc=iterativescan</tt>) is not stable.</li>
John Criswell9321fa82005-05-13 20:28:15 +0000[diff] [blame]258<li>The SparcV8, Alpha, and IA64 code generators are experimental.</li>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]259</ul>
260
261</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]262
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]263<!-- ======================================================================= -->
264<div class="doc_subsection">
265 <a name="core">Known problems with the LLVM Core</a>
266</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]267
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]268<div class="doc_text">
269
270<ul>
Misha Brukman109d9e82005-03-30 19:14:24 +0000[diff] [blame]271 <li>In the JIT, <tt>dlsym()</tt> on a symbol compiled by the JIT will not
272 work.</li>
Reid Spencer4f86f9c2004-11-25 22:38:30 +0000[diff] [blame]273 <li>The JIT does not use mutexes to protect its internal data structures. As
274 such, execution of a threaded program could cause these data structures to be
275 corrupted.
276 </li>
Reid Spencer4f86f9c2004-11-25 22:38:30 +0000[diff] [blame]277 <li><a href="http://llvm.cs.uiuc.edu/PR240">The lower-invoke pass does not
278 mark values live across a setjmp as volatile</a>. This missing feature
279 only affects targets whose setjmp/longjmp libraries do not save and restore
280 the entire register file.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]281</ul>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]282</div>
283
284<!-- ======================================================================= -->
285<div class="doc_subsection">
286 <a name="c-fe">Known problems with the C front-end</a>
287</div>
Chris Lattner47588f92003-10-02 05:07:23 +0000[diff] [blame]288
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]289<!-- _______________________________________________________________________ -->
Chris Lattnerb40efb32003-12-14 05:03:43 +0000[diff] [blame]290<div class="doc_subsubsection">Bugs</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]291
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]292<div class="doc_text">
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]293<ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]294<li>C99 Variable sized arrays do not release stack memory when they go out of
295 scope. Thus, the following program may run out of stack space:
296<pre>
297 for (i = 0; i != 1000000; ++i) {
298 int X[n];
299 foo(X);
300 }
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]301</pre></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]302
Misha Brukman6df9e2c2004-05-12 21:46:05 +0000[diff] [blame]303<li>Initialization of global union variables can only be done <a
Misha Brukman43ee2932004-12-04 00:45:09 +0000[diff] [blame]304href="http://llvm.cs.uiuc.edu/PR162">with the largest union member</a>.</li>
Chris Lattnerf580cdc2004-03-16 21:39:04 +0000[diff] [blame]305
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]306</ul>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]307</div>
308
309<!-- _______________________________________________________________________ -->
310<div class="doc_subsubsection">
311 Notes
312</div>
313
314<div class="doc_text">
315
316<ul>
317
318<li>Inline assembly is not yet supported.</li>
Chris Lattnere01fcfb2003-10-27 18:30:37 +0000[diff] [blame]319
320<li>"long double" is transformed by the front-end into "double". There is no
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]321support for floating point data types of any size other than 32 and 64
322bits.</li>
323
324<li>The following Unix system functionality has not been tested and may not
325work:
Misha Brukmane0c891c2003-11-22 01:00:11 +0000[diff] [blame]326 <ol>
327 <li><tt>sigsetjmp</tt>, <tt>siglongjmp</tt> - These are not turned into the
328 appropriate <tt>invoke</tt>/<tt>unwind</tt> instructions. Note that
329 <tt>setjmp</tt> and <tt>longjmp</tt> <em>are</em> compiled correctly.
330 <li><tt>getcontext</tt>, <tt>setcontext</tt>, <tt>makecontext</tt>
331 - These functions have not been tested.
332 </ol></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]333
334<li>Although many GCC extensions are supported, some are not. In particular,
335 the following extensions are known to <b>not be</b> supported:
336 <ol>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]337 <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]338 <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>
339 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Constructing-Calls.html#Constructing%20Calls">Constructing Calls</a>: Dispatching a call to another function.</li>
340 <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]341 <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]342 <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>
343 <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]344 <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>
345 <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]346 <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]347 <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]348 </ol>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]349
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]350 <p>The following GCC extensions are <b>partially</b> supported. An ignored
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]351 attribute means that the LLVM compiler ignores the presence of the attribute,
352 but the code should still work. An unsupported attribute is one which is
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]353 ignored by the LLVM compiler and will cause a different interpretation of
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]354 the program.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]355
356 <ol>
357 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Length.html#Variable%20Length">Variable Length</a>:
358 Arrays whose length is computed at run time.<br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]359 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]360
361 <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]362
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]363 Declaring that functions have no side effects or that they can never
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]364 return.<br>
365
366 <b>Supported:</b> <tt>format</tt>, <tt>format_arg</tt>, <tt>non_null</tt>,
John Criswell0b5b5e92004-12-08 20:35:47 +0000[diff] [blame]367 <tt>noreturn</tt>, <tt>constructor</tt>, <tt>destructor</tt>,
368 <tt>unused</tt>,
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]369 <tt>deprecated</tt>, <tt>warn_unused_result</tt>, <tt>weak</tt><br>
370
John Criswell0b5b5e92004-12-08 20:35:47 +0000[diff] [blame]371 <b>Ignored:</b> <tt>noinline</tt>,
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]372 <tt>always_inline</tt>, <tt>pure</tt>, <tt>const</tt>, <tt>nothrow</tt>,
373 <tt>malloc</tt>, <tt>no_instrument_function</tt>, <tt>cdecl</tt><br>
374
375 <b>Unsupported:</b> <tt>used</tt>, <tt>section</tt>, <tt>alias</tt>,
376 <tt>visibility</tt>, <tt>regparm</tt>, <tt>stdcall</tt>,
377 <tt>fastcall</tt>, all other target specific attributes</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]378
379 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Attributes.html#Variable%20Attributes">Variable Attributes</a>:
380 Specifying attributes of variables.<br>
381 <b>Supported:</b> <tt>cleanup</tt>, <tt>common</tt>, <tt>nocommon</tt>,
382 <tt>deprecated</tt>, <tt>transparent_union</tt>,
383 <tt>unused</tt>, <tt>weak</tt><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]384
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]385 <b>Unsupported:</b> <tt>aligned</tt>, <tt>mode</tt>, <tt>packed</tt>,
386 <tt>section</tt>, <tt>shared</tt>, <tt>tls_model</tt>,
387 <tt>vector_size</tt>, <tt>dllimport</tt>,
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]388 <tt>dllexport</tt>, all target specific attributes.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]389
Misha Brukmanc4b7bee2003-12-12 04:37:31 +0000[diff] [blame]390 <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]391 <b>Supported:</b> <tt>transparent_union</tt>, <tt>unused</tt>,
Misha Brukmanc4b7bee2003-12-12 04:37:31 +0000[diff] [blame]392 <tt>deprecated</tt>, <tt>may_alias</tt><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]393
394 <b>Unsupported:</b> <tt>aligned</tt>, <tt>packed</tt>,
395 all target specific attributes.</li>
396
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]397 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html#Other%20Builtins">Other Builtins</a>:
398 Other built-in functions.<br>
399 We support all builtins which have a C language equivalent (e.g.,
400 <tt>__builtin_cos</tt>), <tt>__builtin_alloca</tt>,
401 <tt>__builtin_types_compatible_p</tt>, <tt>__builtin_choose_expr</tt>,
Chris Lattnerceebeb62004-06-18 06:26:29 +0000[diff] [blame]402 <tt>__builtin_constant_p</tt>, and <tt>__builtin_expect</tt>
403 (currently ignored). We also support builtins for ISO C99 floating
Chris Lattner7939b782005-05-07 02:21:21 +0000[diff] [blame]404 point comparison macros (e.g., <tt>__builtin_islessequal</tt>),
405 <tt>__builtin_prefetch</tt>, <tt>__builtin_popcount[ll]</tt>,
406 <tt>__builtin_clz[ll]</tt>, and <tt>__builtin_ctz[ll]</tt>.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]407 </ol>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]408
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]409 <p>The following extensions <b>are</b> known to be supported:</p>
410
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]411 <ol>
Chris Lattner7fe97dd2004-03-16 08:54:07 +0000[diff] [blame]412 <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]413 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html#Statement%20Exprs">Statement Exprs</a>: Putting statements and declarations inside expressions.</li>
414 <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]415 <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]416 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Conditionals.html#Conditionals">Conditionals</a>: Omitting the middle operand of a <code>?:</code> expression.</li>
417 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Long-Long.html#Long%20Long">Long Long</a>: Double-word integers.</li>
418 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Complex.html#Complex">Complex</a>: Data types for complex numbers.</li>
419 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Hex-Floats.html#Hex%20Floats">Hex Floats</a>:Hexadecimal floating-point constants.</li>
420 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html#Zero%20Length">Zero Length</a>: Zero-length arrays.</li>
421 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Empty-Structures.html#Empty%20Structures">Empty Structures</a>: Structures with no members.</li>
422 <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>
423 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Escaped-Newlines.html#Escaped%20Newlines">Escaped Newlines</a>: Slightly looser rules for escaped newlines.</li>
424 <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]425 <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]426 <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]427 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Compound-Literals.html#Compound%20Literals">Compound Literals</a>: Compound literals give structures, unions,
428or arrays as values.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]429 <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]430 <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]431 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Case-Ranges.html#Case%20Ranges">Case Ranges</a>: `case 1 ... 9' and such.</li>
432 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Mixed-Declarations.html#Mixed%20Declarations">Mixed Declarations</a>: Mixing declarations and code.</li>
433 <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]434 <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]435 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Dollar-Signs.html#Dollar%20Signs">Dollar Signs</a>: Dollar sign is allowed in identifiers.</li>
436 <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>
437 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Alignment.html#Alignment">Alignment</a>: Inquiring about the alignment of a type or variable.</li>
438 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Inline.html#Inline">Inline</a>: Defining inline functions (as fast as macros).</li>
439 <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>
440 <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>
441 <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]442 <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]443 <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>
444 <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]445 </ol></li>
446
447</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]448
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]449<p>If you run into GCC extensions which have not been included in any of these
450lists, please let us know (also including whether or not they work).</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]451
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]452</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]453
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]454<!-- ======================================================================= -->
455<div class="doc_subsection">
456 <a name="c++-fe">Known problems with the C++ front-end</a>
457</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]458
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]459<div class="doc_text">
460
Reid Spencere09ca642004-12-07 08:39:08 +0000[diff] [blame]461<p>For this release, the C++ front-end is considered to be fully
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame]462tested and works for a number of non-trivial programs, including LLVM
463itself.</p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]464
465</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]466
467<!-- _______________________________________________________________________ -->
Chris Lattner3a51be12004-02-14 04:12:41 +0000[diff] [blame]468<div class="doc_subsubsection">Bugs</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]469
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]470<div class="doc_text">
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]471
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]472<ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]473<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]474 front-end</a>.</li>
Chris Lattner7962f712004-07-17 02:04:41 +0000[diff] [blame]475
Chris Lattnerd5713882004-08-02 20:28:44 +0000[diff] [blame]476<li><b>IA-64 specific</b>: The C++ front-end does not use <a
477href="http://llvm.cs.uiuc.edu/PR406">IA64 ABI compliant layout of v-tables</a>.
Chris Lattner7962f712004-07-17 02:04:41 +0000[diff] [blame]478In particular, it just stores function pointers instead of function
479descriptors in the vtable. This bug prevents mixing C++ code compiled with
Chris Lattner04db8082004-08-02 20:29:51 +0000[diff] [blame]480LLVM with C++ objects compiled by other C++ compilers.</li>
Chris Lattner7962f712004-07-17 02:04:41 +0000[diff] [blame]481
Chris Lattnerd5713882004-08-02 20:28:44 +0000[diff] [blame]482</ul>
483
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]484</div>
485
486<!-- _______________________________________________________________________ -->
487<div class="doc_subsubsection">
488 Notes
489</div>
490
491<div class="doc_text">
492
493<ul>
Chris Lattnere01fcfb2003-10-27 18:30:37 +0000[diff] [blame]494
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]495<li>The C++ front-end is based on a pre-release of the GCC 3.4 C++ parser. This
496parser is significantly more standards compliant (and picky) than prior GCC
497versions. For more information, see the C++ section of the <a
Chris Lattner9e848092003-12-12 04:25:33 +0000[diff] [blame]498href="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]499
500<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]501 performed. In particular, destructors for objects in the <tt>longjmp</tt>ing
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]502 function and in the <tt>setjmp</tt> receiver function may not be run.
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]503 Objects in intervening stack frames will be destroyed, however (which is
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]504 better than most compilers).</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]505
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]506<li>The LLVM C++ front-end follows the <a
507 href="http://www.codesourcery.com/cxx-abi">Itanium C++ ABI</a>.
508 This document, which is not Itanium specific, specifies a standard for name
509 mangling, class layout, v-table layout, RTTI formats, and other C++
510 representation issues. Because we use this API, code generated by the LLVM
511 compilers should be binary compatible with machine code generated by other
512 Itanium ABI C++ compilers (such as G++, the Intel and HP compilers, etc).
513 <i>However</i>, the exception handling mechanism used by LLVM is very
514 different from the model used in the Itanium ABI, so <b>exceptions will not
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]515 interact correctly</b>. </li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]516
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]517</ul>
Chris Lattnerfcc54b32003-10-07 22:14:37 +0000[diff] [blame]518
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]519</div>
520
521<!-- ======================================================================= -->
522<div class="doc_subsection">
523 <a name="x86-be">Known problems with the X86 back-end</a>
524</div>
525
526<div class="doc_text">
527
528<ul>
John Criswell9321fa82005-05-13 20:28:15 +0000[diff] [blame]529 <li>None yet</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]530</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]531
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]532</div>
533
534<!-- ======================================================================= -->
535<div class="doc_subsection">
Misha Brukmanadb1c392004-07-12 16:55:41 +0000[diff] [blame]536 <a name="sparcv9-be">Known problems with the SparcV9 back-end</a>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]537</div>
538
539<div class="doc_text">
540
541<ul>
Misha Brukmanadb1c392004-07-12 16:55:41 +0000[diff] [blame]542<li><a href="http://llvm.cs.uiuc.edu/PR60">[sparcv9] SparcV9 backend miscompiles
543several programs in the LLVM test suite</a></li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]544</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]545
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]546</div>
547
548<!-- ======================================================================= -->
549<div class="doc_subsection">
Chris Lattnerf32a5f52004-11-07 01:55:32 +0000[diff] [blame]550 <a name="ppc-be">Known problems with the PowerPC back-end</a>
551</div>
552
553<div class="doc_text">
554
555<ul>
John Criswell9321fa82005-05-13 20:28:15 +0000[diff] [blame]556<li>None yet</li>
Chris Lattnerf32a5f52004-11-07 01:55:32 +0000[diff] [blame]557</ul>
558
559</div>
560
561<!-- ======================================================================= -->
562<div class="doc_subsection">
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]563 <a name="c-be">Known problems with the C back-end</a>
564</div>
565
566<div class="doc_text">
567
568<ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]569
570<li>The C back-end produces code that violates the ANSI C Type-Based Alias
571Analysis rules. As such, special options may be necessary to compile the code
572(for example, GCC requires the <tt>-fno-strict-aliasing</tt> option). This
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]573problem probably cannot be fixed.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]574
Chris Lattner2855ecd2003-11-04 20:06:53 +0000[diff] [blame]575<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]576supported</a>. This should not affect LLVM produced by the C or C++
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]577frontends.</li>
Chris Lattner2af46052003-10-24 04:03:19 +0000[diff] [blame]578
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]579</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]580
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]581</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]582
Andrew Lenharth30a1f8f2005-05-03 16:59:09 +0000[diff] [blame]583<!-- ======================================================================= -->
584<div class="doc_subsection">
585 <a name="alpha-be">Known problems with the Alpha back-end</a>
586</div>
587
588<div class="doc_text">
589
590<ul>
591
592<li>On 21164s, some rare FP arithmatic sequences which may trap do not have the appropriate nops inserted to ensure restartability.</li>
593
594<li>Vararg functions are not supported.</li>
595
596</ul>
597
598</div>
599
Duraid Madina2e36d6e2005-05-14 05:48:13 +0000[diff] [blame^]600<!-- ======================================================================= -->
601<div class="doc_subsection">
602 <a name="ia64-be">Known problems with the IA64 back-end</a>
603</div>
604
605<div class="doc_text">
606
607<ul>
608
609<li>C++ programs are likely to fail on IA64, as calls to <tt>setjmp</tt> are
610made where the argument is not 16-byte aligned, as required on IA64. (Strictly
611speaking this is not a bug in the IA64 back-end; it will also be encountered
612when building C++ programs using the C back-end.)</li>
613
614<li>There are a few ABI violations which will lead to problems
615when mixing LLVM output with code built with other compilers,
616particularly for C++ and floating-point programs.</li>
617
618<li>Vararg functions are not supported.</li>
619
620</ul>
621
622</div>
623
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]624<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]625<div class="doc_section">
626 <a name="additionalinfo">Additional Information</a>
627</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]628<!-- *********************************************************************** -->
629
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]630<div class="doc_text">
631
632<p>A wide variety of additional information is available on the LLVM web page,
Misha Brukman109d9e82005-03-30 19:14:24 +0000[diff] [blame]633including <a href="http://llvm.cs.uiuc.edu/docs/#maillist">mailing lists</a> and
634<a href="http://llvm.cs.uiuc.edu/pubs/">publications describing algorithms and
635components implemented in LLVM</a>. The web page also contains versions of the
636API documentation which is up-to-date with the CVS version of the source code.
637You can access versions of these documents specific to this release by going
638into the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]639
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]640<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]641us via the <a href="http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev">mailing
642lists</a>.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]643
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]644</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]645
646<!-- *********************************************************************** -->
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]647
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]648<hr>
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]649<address>
Misha Brukman38847d52003-12-21 22:53:21 +0000[diff] [blame]650 <a href="http://jigsaw.w3.org/css-validator/check/referer"><img
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]651 src="http://jigsaw.w3.org/css-validator/images/vcss" alt="Valid CSS!"></a>
652 <a href="http://validator.w3.org/check/referer"><img
653 src="http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01!" /></a>
654
Misha Brukmane0c891c2003-11-22 01:00:11 +0000[diff] [blame]655 <a href="http://llvm.cs.uiuc.edu">The LLVM Compiler Infrastructure</a><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]656 Last modified: $Date$
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]657</address>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]658
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]659</body>
660</html>