Gitiles
Code Review Sign In
gerrit-public.fairphone.software / toolchain / llvm-project / c792eb342ca1f1c89d508da9eb2ecc903bab1224 / . / llvm / docs / ReleaseNotes.html
blob: 2845202bf84bcbf5f33ca19243bc03bea921ab83 [file] [log] [blame]
Misha Brukman80731b92003-11-22 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 Spencere4190fa2004-11-18 18:38:58 +0000[diff] [blame]5 <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]6 <link rel="stylesheet" href="llvm.css" type="text/css">
Chris Lattnerf3a7c242004-12-09 22:22:58 +0000[diff] [blame]7 <title>LLVM 1.5 Release Notes</title>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]8</head>
9<body>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]10
Chris Lattnerf3a7c242004-12-09 22:22:58 +0000[diff] [blame]11<div class="doc_title">LLVM 1.5 Release Notes</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]12
13<ol>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]14 <li><a href="#intro">Introduction</a></li>
15 <li><a href="#whatsnew">What's New?</a></li>
Chris Lattner77a51732004-04-30 22:17:12 +0000[diff] [blame]16 <li><a href="GettingStarted.html">Installation Instructions</a></li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]17 <li><a href="#portability">Portability and Supported Platforms</a></li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]18 <li><a href="#knownproblems">Known Problems</a>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]19 <li><a href="#additionalinfo">Additional Information</a></li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]20</ol>
21
Chris Lattner020e1fc2004-05-23 21:07:27 +0000[diff] [blame]22<div class="doc_author">
Chris Lattnerf3a7c242004-12-09 22:22:58 +0000[diff] [blame]23 <p>Written by the <a href="http://llvm.cs.uiuc.edu">LLVM Team</a><p>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]24</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]25
26<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]27<div class="doc_section">
28 <a name="intro">Introduction</a>
29</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]30<!-- *********************************************************************** -->
31
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]32<div class="doc_text">
33
34<p>This document contains the release notes for the LLVM compiler
Chris Lattnerf3a7c242004-12-09 22:22:58 +0000[diff] [blame]35infrastructure, release 1.5. Here we describe the status of LLVM, including any
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]36known problems and improvements from the previous release. The most up-to-date
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]37version of this document can be found on the <a
Chris Lattnerf3a7c242004-12-09 22:22:58 +0000[diff] [blame]38href="http://llvm.cs.uiuc.edu/releases/1.5/">LLVM 1.5 web site</a>. If you are
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]39not reading this on the LLVM web pages, you should probably go there because
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]40this document may be updated after the release.</p>
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]41
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]42<p>For more information about LLVM, including information about the latest
43release, please check out the <a href="http://llvm.cs.uiuc.edu">main LLVM
Chris Lattnere7525b52003-10-07 21:38:31 +0000[diff] [blame]44web site</a>. If you have questions or comments, the <a
45href="http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVM developer's mailing
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]46list</a> is a good place to send them.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]47
Chris Lattnerf3a7c242004-12-09 22:22:58 +0000[diff] [blame]48<p>Note that if you are reading this file from CVS or the main LLVM web page,
49this document applies to the <i>next</i> release, not the current one. To see
50the release notes for the current or previous releases, see the <a
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]51href="http://llvm.cs.uiuc.edu/releases/">releases page</a>.</p>
52
53</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]54
55<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]56<div class="doc_section">
57 <a name="whatsnew">What's New?</a>
58</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]59<!-- *********************************************************************** -->
60
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]61<div class="doc_text">
62
Chris Lattnerf3a7c242004-12-09 22:22:58 +0000[diff] [blame]63<p>This is the sixth public release of the LLVM compiler infrastructure.</p>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]64
Chris Lattner7c0241c2004-12-10 16:27:34 +0000[diff] [blame]65<p> At this time, LLVM is known to correctly compile a broad range of C and
Chris Lattnerf3a7c242004-12-09 22:22:58 +0000[diff] [blame]66C++ programs, including the SPEC CPU95 &amp; 2000 suite. TODO. It also includes
67bug fixes for those problems found since the 1.4 release.</p>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]68
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]69</div>
70
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]71<!--=========================================================================-->
72<div class="doc_subsubsection">
Chris Lattner8ebf2532004-02-25 16:36:51 +0000[diff] [blame]73<a name="newfeatures">This release implements the following new features:</a>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]74</div>
Chris Lattnere7525b52003-10-07 21:38:31 +0000[diff] [blame]75
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]76<div class="doc_text">
Chris Lattnere7525b52003-10-07 21:38:31 +0000[diff] [blame]77<ol>
Chris Lattner7bf2e542004-12-11 06:10:52 +0000[diff] [blame]78 <li>LLVM now includes an <a href="http://llvm.cs.uiuc.edu/PR415">
Chris Lattner64d9d2b2005-01-22 18:45:35 +0000[diff] [blame]79 Interprocedural Sparse Conditional Constant Propagation</a> pass, named
Chris Lattner7bf2e542004-12-11 06:10:52 +0000[diff] [blame]80 -ipsccp, which is run by default at link-time.</li>
Chris Lattnerf87e05b2005-02-01 01:33:52 +0000[diff] [blame]81 <li>LLVM 1.5 is now about 15% faster than LLVM 1.4 and its core data structures
Chris Lattnere14babd2005-02-13 22:27:24 +0000[diff] [blame]82 use about 30% less memory.</li>
Misha Brukmanf12594d2005-03-18 00:48:56 +0000[diff] [blame]83 <li>LLVM includes new experimental native code generators for SparcV8,
84 Alpha, and IA64.</li>
Chris Lattnere14babd2005-02-13 22:27:24 +0000[diff] [blame]85 <li>Support for Microsoft Visual Studio is improved, and <a
Chris Lattnerbe895ed2005-02-14 22:58:38 +0000[diff] [blame]86 href="GettingStartedVS.html">now documented</a>.</li>
Reid Spencer51efcef2005-04-22 20:27:33 +0000[diff] [blame]87 <li>Configuring LLVM to build targets selectively is now implemented, via the
88 <tt>--enable-targets=</tt> option. This feature is documented
89 <a href="GettingStarted.html#config">here</a>.</li>
Chris Lattnerc792eb32005-05-06 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 Lattner592db402003-11-19 22:05:38 +0000[diff] [blame]92</ol>
Chris Lattner4491de62003-11-08 04:28:55 +0000[diff] [blame]93
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]94</div>
95
Chris Lattnerba7bd472003-12-06 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 Lattner4491de62003-11-08 04:28:55 +0000[diff] [blame]101
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]102<div class="doc_text">
103
Chris Lattner4491de62003-11-08 04:28:55 +0000[diff] [blame]104<ol>
Chris Lattner81c1dd22005-02-28 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 Lattnerdb302f82005-03-11 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.
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]109</ol>
Chris Lattnere7525b52003-10-07 21:38:31 +0000[diff] [blame]110
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]111</div>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]112
113<!--=========================================================================-->
114<div class="doc_subsubsection">
Misha Brukman017f2f32004-04-19 02:56:49 +0000[diff] [blame]115<a name="qualityofimp">In this release, the following Quality of Implementation
116issues were fixed:</a>
Chris Lattner4df78f02003-12-20 03:42:11 +0000[diff] [blame]117</div>
118
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]119<div class="doc_text">
120
Chris Lattner4df78f02003-12-20 03:42:11 +0000[diff] [blame]121<ol>
Chris Lattner64d9d2b2005-01-22 18:45:35 +0000[diff] [blame]122 <li><a href="http://llvm.cs.uiuc.edu/PR448">Building LLVM in optimized mode
123 should no longer cause GCC to hit swap in the PowerPC backend.</a></li>
Brian Gaeke8b05e4f2004-01-16 21:55:04 +0000[diff] [blame]124</ol>
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]125</div>
Brian Gaeke8b05e4f2004-01-16 21:55:04 +0000[diff] [blame]126
127<!--=========================================================================-->
128<div class="doc_subsubsection">
Chris Lattner2ad48782004-05-02 04:19:15 +0000[diff] [blame]129<a name="codequality">This release includes the following Code Quality
130improvements:</a>
Chris Lattner23257062004-05-23 20:42:08 +0000[diff] [blame]131</div>
Chris Lattner639579c2003-10-27 17:06:39 +0000[diff] [blame]132
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]133<div class="doc_text">
Chris Lattner639579c2003-10-27 17:06:39 +0000[diff] [blame]134<ol>
Andrew Lenharth2e18c622005-05-03 16:59:09 +0000[diff] [blame]135 <li>Transition code for 1.0 style varargs was removed. </li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]136</ol>
Reid Spencer3e58f582004-05-23 17:23:13 +0000[diff] [blame]137</div>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]138
139<!--=========================================================================-->
140<div class="doc_subsubsection">
Misha Brukman017f2f32004-04-19 02:56:49 +0000[diff] [blame]141<a name="bugfix">In this release, the following bugs in the previous release
142were fixed:</a>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]143</div>
144
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]145<div class="doc_text">
146
Chris Lattnere7525b52003-10-07 21:38:31 +0000[diff] [blame]147
Chris Lattner1c75b252005-02-14 16:57:55 +0000[diff] [blame]148<p>Bugs fixed in the LLVM Core:</p>
Chris Lattnere7525b52003-10-07 21:38:31 +0000[diff] [blame]149<ol>
Chris Lattnerb5c253a2004-12-29 04:39:50 +0000[diff] [blame]150 <li><a href="http://llvm.cs.uiuc.edu/PR491">[dse] DSE deletes stores that
151 are partially overwritten by smaller stores</a></li>
Chris Lattner181c8182005-04-19 06:08:04 +0000[diff] [blame]152 <li><a href="http://llvm.cs.uiuc.edu/PR548">[instcombine] miscompilation of
153 setcc or setcc in one case</a></li>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]154</ol>
155
Chris Lattner1c75b252005-02-14 16:57:55 +0000[diff] [blame]156<p>Code Generator Bugs:</p>
157<ol>
158 <li><a href="http://llvm.cs.uiuc.edu/PR490">[cbackend] Logical constant
159 expressions (and/or/xor) not implemented</a></li>
160 <li><a href="http://llvm.cs.uiuc.edu/PR511">[cbackend] C backend does not
161 respect 'volatile'</a></li>
162</ol>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]163
Chris Lattner1c75b252005-02-14 16:57:55 +0000[diff] [blame]164<p>Bugs in the C/C++ front-end:</p>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]165<ol>
Chris Lattnere1329f42005-01-03 04:20:21 +0000[diff] [blame]166 <li><a href="http://llvm.cs.uiuc.edu/PR487">[llvmgcc] llvm-gcc incorrectly
167 rejects some constant initializers involving the addresses of array
168 elements</a></li>
Chris Lattner2a38aea2005-02-11 19:29:52 +0000[diff] [blame]169 <li><a href="http://llvm.cs.uiuc.edu/PR501">[llvm-g++] Crash compiling
170 anonymous union</a></li>
Chris Lattner1c75b252005-02-14 16:57:55 +0000[diff] [blame]171 <li><a href="http://llvm.cs.uiuc.edu/PR509">[llvm-g++] Do not use dynamic
172 initialization where static init will do</a></li>
Chris Lattner1f031b22005-02-15 05:28:06 +0000[diff] [blame]173 <li><a href="http://llvm.cs.uiuc.edu/PR510">[llvmgcc] Field offset
174 miscalculated for some structure fields following bit fields</a></li>
Chris Lattner385a4732005-02-15 07:02:12 +0000[diff] [blame]175 <li><a href="http://llvm.cs.uiuc.edu/PR513">[llvm-g++] Temporary lifetimes
176 incorrect for short circuit logical operations</a></li>
Chris Lattner48c23142005-02-19 07:29:25 +0000[diff] [blame]177 <li><a href="http://llvm.cs.uiuc.edu/PR517">[llvm-gcc] Crash compiling
178 bitfield &lt;-&gt; aggregate assignment</a></li>
Chris Lattner6a3ae642005-02-19 17:13:20 +0000[diff] [blame]179 <li><a href="http://llvm.cs.uiuc.edu/PR520">[llvm-g++] Error compiling
Chris Lattner3d6194f2005-02-19 17:17:32 +0000[diff] [blame]180 virtual function thunk with an unnamed argument</a></li>
Chris Lattner3a8f68e2005-02-20 23:31:49 +0000[diff] [blame]181 <li><a href="http://llvm.cs.uiuc.edu/PR522">[llvm-gcc] Crash on certain
182 C99 complex number routines</a></li>
Chris Lattnerc6e33802005-02-27 19:31:02 +0000[diff] [blame]183 <li><a href="http://llvm.cs.uiuc.edu/PR529">[llvm-g++] Crash using placement
184 new on an array type</a></li>
Brian Gaeke730d8d62004-08-24 07:43:48 +0000[diff] [blame]185</ol>
186
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]187</div>
Reid Spencer3e58f582004-05-23 17:23:13 +0000[diff] [blame]188
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]189<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]190<div class="doc_section">
191 <a name="portability">Portability and Supported Platforms</a>
192</div>
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]193<!-- *********************************************************************** -->
194
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]195<div class="doc_text">
196
John Criswell64307722004-12-08 20:35:47 +0000[diff] [blame]197<p>LLVM is known to work on the following platforms:</p>
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]198
199<ul>
200<li>Intel and AMD machines running Red Hat Linux and FreeBSD (and probably
201 other unix-like systems).</li>
202<li>Sun UltraSPARC workstations running Solaris 8.</li>
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]203<li>Intel and AMD machines running on Win32 with the Cygwin libraries (limited
204 support is available for native builds with Visual C++).</li>
205<li>PowerPC-based Mac OS X systems, running 10.2 and above.</li>
Andrew Lenharth2e18c622005-05-03 16:59:09 +0000[diff] [blame]206<li>Alpha-based machines running Debian GNU/Linux</li>
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]207</ul>
208
Brian Gaekee3e557e2004-05-09 05:28:35 +0000[diff] [blame]209<p>The core LLVM infrastructure uses
210<a href="http://www.gnu.org/software/autoconf/">GNU autoconf</a> to adapt itself
211to the machine and operating system on which it is built. However, minor
212porting may be required to get LLVM to work on new platforms. We welcome your
213portability patches and reports of successful builds or error messages.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]214
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]215</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]216
217<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]218<div class="doc_section">
219 <a name="knownproblems">Known Problems</a>
220</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]221<!-- *********************************************************************** -->
222
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]223<div class="doc_text">
224
225<p>This section contains all known problems with the LLVM system, listed by
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]226component. As new problems are discovered, they will be added to these
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]227sections. If you run into a problem, please check the <a
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]228href="http://llvm.cs.uiuc.edu/bugs/">LLVM bug database</a> and submit a bug if
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]229there isn't already one.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]230
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]231</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]232
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]233<!-- ======================================================================= -->
234<div class="doc_subsection">
235 <a name="experimental">Experimental features included with this release</a>
236</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]237
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]238<div class="doc_text">
239
Misha Brukmanfa50a222004-05-12 21:46:05 +0000[diff] [blame]240<p>The following components of this LLVM release are either untested, known to
241be broken or unreliable, or are in early development. These components should
242not be relied on, and bugs should not be filed against them, but they may be
243useful to some people. In particular, if you would like to work on one of these
244components, please contact us on the llvmdev list.</p>
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]245
246<ul>
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]247<li>The following passes are incomplete or buggy, and may be removed in future
Chris Lattner38389b12005-01-28 06:13:52 +0000[diff] [blame]248 releases: <tt>-cee, -branch-combine, -instloops, -paths, -pre</tt></li>
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]249<li>The <tt>llvm-db</tt> tool is in a very early stage of development, but can
250 be used to step through programs and inspect the stack.</li>
Misha Brukman96158092005-03-30 19:14:24 +0000[diff] [blame]251<li>The "iterative scan" register allocator (enabled with
252 <tt>-regalloc=iterativescan</tt>) is not stable.</li>
Misha Brukmanf12594d2005-03-18 00:48:56 +0000[diff] [blame]253<li>The SparcV8, Alpha, and IA64 ports are experimental.</li>
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]254</ul>
255
256</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]257
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]258<!-- ======================================================================= -->
259<div class="doc_subsection">
260 <a name="core">Known problems with the LLVM Core</a>
261</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]262
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]263<div class="doc_text">
264
265<ul>
Misha Brukman96158092005-03-30 19:14:24 +0000[diff] [blame]266 <li>In the JIT, <tt>dlsym()</tt> on a symbol compiled by the JIT will not
267 work.</li>
Reid Spencer493d9c22004-11-25 22:38:30 +0000[diff] [blame]268 <li>The JIT does not use mutexes to protect its internal data structures. As
269 such, execution of a threaded program could cause these data structures to be
270 corrupted.
271 </li>
Reid Spencer493d9c22004-11-25 22:38:30 +0000[diff] [blame]272 <li><a href="http://llvm.cs.uiuc.edu/PR240">The lower-invoke pass does not
273 mark values live across a setjmp as volatile</a>. This missing feature
274 only affects targets whose setjmp/longjmp libraries do not save and restore
275 the entire register file.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]276</ul>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]277</div>
278
279<!-- ======================================================================= -->
280<div class="doc_subsection">
281 <a name="c-fe">Known problems with the C front-end</a>
282</div>
Chris Lattner178f3db2003-10-02 05:07:23 +0000[diff] [blame]283
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]284<!-- _______________________________________________________________________ -->
Chris Lattner5a8a7282003-12-14 05:03:43 +0000[diff] [blame]285<div class="doc_subsubsection">Bugs</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]286
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]287<div class="doc_text">
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]288<ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]289<li>C99 Variable sized arrays do not release stack memory when they go out of
290 scope. Thus, the following program may run out of stack space:
291<pre>
292 for (i = 0; i != 1000000; ++i) {
293 int X[n];
294 foo(X);
295 }
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]296</pre></li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]297
Misha Brukmanfa50a222004-05-12 21:46:05 +0000[diff] [blame]298<li>Initialization of global union variables can only be done <a
Misha Brukman68ef9a92004-12-04 00:45:09 +0000[diff] [blame]299href="http://llvm.cs.uiuc.edu/PR162">with the largest union member</a>.</li>
Chris Lattner1ab58dd2004-03-16 21:39:04 +0000[diff] [blame]300
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]301</ul>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]302</div>
303
304<!-- _______________________________________________________________________ -->
305<div class="doc_subsubsection">
306 Notes
307</div>
308
309<div class="doc_text">
310
311<ul>
312
313<li>Inline assembly is not yet supported.</li>
Chris Lattnerd2a74272003-10-27 18:30:37 +0000[diff] [blame]314
315<li>"long double" is transformed by the front-end into "double". There is no
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]316support for floating point data types of any size other than 32 and 64
317bits.</li>
318
319<li>The following Unix system functionality has not been tested and may not
320work:
Misha Brukman7cb4e382003-11-22 01:00:11 +0000[diff] [blame]321 <ol>
322 <li><tt>sigsetjmp</tt>, <tt>siglongjmp</tt> - These are not turned into the
323 appropriate <tt>invoke</tt>/<tt>unwind</tt> instructions. Note that
324 <tt>setjmp</tt> and <tt>longjmp</tt> <em>are</em> compiled correctly.
325 <li><tt>getcontext</tt>, <tt>setcontext</tt>, <tt>makecontext</tt>
326 - These functions have not been tested.
327 </ol></li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]328
329<li>Although many GCC extensions are supported, some are not. In particular,
330 the following extensions are known to <b>not be</b> supported:
331 <ol>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]332 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Local-Labels.html#Local%20Labels">Local Labels</a>: Labels local to a block.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]333 <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>
334 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Constructing-Calls.html#Constructing%20Calls">Constructing Calls</a>: Dispatching a call to another function.</li>
335 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Extended-Asm.html#Extended%20Asm">Extended Asm</a>: Assembler instructions with C expressions as operands.</li>
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]336 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Constraints.html#Constraints">Constraints</a>: Constraints for asm operands.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]337 <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>
338 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Explicit-Reg-Vars.html#Explicit%20Reg%20Vars">Explicit Reg Vars</a>: Defining variables residing in specified registers.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]339 <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>
340 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Target-Builtins.html#Target%20Builtins">Target Builtins</a>: Built-in functions specific to particular targets.</li>
Tanya Lattner63371342004-12-08 18:25:34 +0000[diff] [blame]341 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Thread_002dLocal.html">Thread-Local</a>: Per-thread variables.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]342 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Pragmas.html#Pragmas">Pragmas</a>: Pragmas accepted by GCC.</li>
Misha Brukman7cb4e382003-11-22 01:00:11 +0000[diff] [blame]343 </ol>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]344
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]345 <p>The following GCC extensions are <b>partially</b> supported. An ignored
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]346 attribute means that the LLVM compiler ignores the presence of the attribute,
347 but the code should still work. An unsupported attribute is one which is
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]348 ignored by the LLVM compiler and will cause a different interpretation of
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]349 the program.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]350
351 <ol>
352 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Length.html#Variable%20Length">Variable Length</a>:
353 Arrays whose length is computed at run time.<br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]354 Supported, but allocated stack space is not freed until the function returns (noted above).</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]355
356 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html#Function%20Attributes">Function Attributes</a>:
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]357
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]358 Declaring that functions have no side effects or that they can never
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]359 return.<br>
360
361 <b>Supported:</b> <tt>format</tt>, <tt>format_arg</tt>, <tt>non_null</tt>,
John Criswell64307722004-12-08 20:35:47 +0000[diff] [blame]362 <tt>noreturn</tt>, <tt>constructor</tt>, <tt>destructor</tt>,
363 <tt>unused</tt>,
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]364 <tt>deprecated</tt>, <tt>warn_unused_result</tt>, <tt>weak</tt><br>
365
John Criswell64307722004-12-08 20:35:47 +0000[diff] [blame]366 <b>Ignored:</b> <tt>noinline</tt>,
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]367 <tt>always_inline</tt>, <tt>pure</tt>, <tt>const</tt>, <tt>nothrow</tt>,
368 <tt>malloc</tt>, <tt>no_instrument_function</tt>, <tt>cdecl</tt><br>
369
370 <b>Unsupported:</b> <tt>used</tt>, <tt>section</tt>, <tt>alias</tt>,
371 <tt>visibility</tt>, <tt>regparm</tt>, <tt>stdcall</tt>,
372 <tt>fastcall</tt>, all other target specific attributes</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]373
374 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Attributes.html#Variable%20Attributes">Variable Attributes</a>:
375 Specifying attributes of variables.<br>
376 <b>Supported:</b> <tt>cleanup</tt>, <tt>common</tt>, <tt>nocommon</tt>,
377 <tt>deprecated</tt>, <tt>transparent_union</tt>,
378 <tt>unused</tt>, <tt>weak</tt><br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]379
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]380 <b>Unsupported:</b> <tt>aligned</tt>, <tt>mode</tt>, <tt>packed</tt>,
381 <tt>section</tt>, <tt>shared</tt>, <tt>tls_model</tt>,
382 <tt>vector_size</tt>, <tt>dllimport</tt>,
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]383 <tt>dllexport</tt>, all target specific attributes.</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]384
Misha Brukman8395d732003-12-12 04:37:31 +0000[diff] [blame]385 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Type-Attributes.html#Type%20Attributes">Type Attributes</a>: Specifying attributes of types.<br>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]386 <b>Supported:</b> <tt>transparent_union</tt>, <tt>unused</tt>,
Misha Brukman8395d732003-12-12 04:37:31 +0000[diff] [blame]387 <tt>deprecated</tt>, <tt>may_alias</tt><br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]388
389 <b>Unsupported:</b> <tt>aligned</tt>, <tt>packed</tt>,
390 all target specific attributes.</li>
391
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]392 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html#Other%20Builtins">Other Builtins</a>:
393 Other built-in functions.<br>
394 We support all builtins which have a C language equivalent (e.g.,
395 <tt>__builtin_cos</tt>), <tt>__builtin_alloca</tt>,
396 <tt>__builtin_types_compatible_p</tt>, <tt>__builtin_choose_expr</tt>,
Chris Lattnerb7c4bac2004-06-18 06:26:29 +0000[diff] [blame]397 <tt>__builtin_constant_p</tt>, and <tt>__builtin_expect</tt>
398 (currently ignored). We also support builtins for ISO C99 floating
Chris Lattnerdb302f82005-03-11 06:16:26 +0000[diff] [blame]399 point comparison macros (e.g., <tt>__builtin_islessequal</tt>), and
400 <tt>__builtin_prefetch</tt>.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]401 </ol>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]402
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]403 <p>The following extensions <b>are</b> known to be supported:</p>
404
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]405 <ol>
Chris Lattnerd3dc8502004-03-16 08:54:07 +0000[diff] [blame]406 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Labels-as-Values.html#Labels%20as%20Values">Labels as Values</a>: Getting pointers to labels and computed gotos.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]407 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html#Statement%20Exprs">Statement Exprs</a>: Putting statements and declarations inside expressions.</li>
408 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Typeof.html#Typeof">Typeof</a>: <code>typeof</code>: referring to the type of an expression.</li>
Tanya Lattnerce33a1b2004-06-22 03:48:17 +0000[diff] [blame]409 <li><a href="http://gcc.gnu.org/onlinedocs/gcc-3.4.0/gcc/Lvalues.html#Lvalues">Lvalues</a>: Using <code>?:</code>, "<code>,</code>" and casts in lvalues.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]410 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Conditionals.html#Conditionals">Conditionals</a>: Omitting the middle operand of a <code>?:</code> expression.</li>
411 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Long-Long.html#Long%20Long">Long Long</a>: Double-word integers.</li>
412 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Complex.html#Complex">Complex</a>: Data types for complex numbers.</li>
413 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Hex-Floats.html#Hex%20Floats">Hex Floats</a>:Hexadecimal floating-point constants.</li>
414 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html#Zero%20Length">Zero Length</a>: Zero-length arrays.</li>
415 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Empty-Structures.html#Empty%20Structures">Empty Structures</a>: Structures with no members.</li>
416 <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>
417 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Escaped-Newlines.html#Escaped%20Newlines">Escaped Newlines</a>: Slightly looser rules for escaped newlines.</li>
418 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Subscripting.html#Subscripting">Subscripting</a>: Any array can be subscripted, even if not an lvalue.</li>
Misha Brukman8395d732003-12-12 04:37:31 +0000[diff] [blame]419 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Pointer-Arith.html#Pointer%20Arith">Pointer Arith</a>: Arithmetic on <code>void</code>-pointers and function pointers.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]420 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Initializers.html#Initializers">Initializers</a>: Non-constant initializers.</li>
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]421 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Compound-Literals.html#Compound%20Literals">Compound Literals</a>: Compound literals give structures, unions,
422or arrays as values.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]423 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Designated-Inits.html#Designated%20Inits">Designated Inits</a>: Labeling elements of initializers.</li>
Misha Brukman8395d732003-12-12 04:37:31 +0000[diff] [blame]424 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Cast-to-Union.html#Cast%20to%20Union">Cast to Union</a>: Casting to union type from any member of the union.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]425 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Case-Ranges.html#Case%20Ranges">Case Ranges</a>: `case 1 ... 9' and such.</li>
426 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Mixed-Declarations.html#Mixed%20Declarations">Mixed Declarations</a>: Mixing declarations and code.</li>
427 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Function-Prototypes.html#Function%20Prototypes">Function Prototypes</a>: Prototype declarations and old-style definitions.</li>
Tanya Lattner7591b822004-12-08 18:29:38 +0000[diff] [blame]428 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/C_002b_002b-Comments.html#C_002b_002b-Comments">C++ Comments</a>: C++ comments are recognized.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]429 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Dollar-Signs.html#Dollar%20Signs">Dollar Signs</a>: Dollar sign is allowed in identifiers.</li>
430 <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>
431 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Alignment.html#Alignment">Alignment</a>: Inquiring about the alignment of a type or variable.</li>
432 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Inline.html#Inline">Inline</a>: Defining inline functions (as fast as macros).</li>
433 <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>
434 <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>
435 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Function-Names.html#Function%20Names">Function Names</a>: Printable strings which are the name of the current function.</li>
Chris Lattner3646dad2004-02-14 04:08:29 +0000[diff] [blame]436 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Return-Address.html#Return%20Address">Return Address</a>: Getting the return or frame address of a function.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]437 <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>
438 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Attribute-Syntax.html#Attribute%20Syntax">Attribute Syntax</a>: Formal syntax for attributes.</li>
Misha Brukman7cb4e382003-11-22 01:00:11 +0000[diff] [blame]439 </ol></li>
440
441</ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]442
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]443<p>If you run into GCC extensions which have not been included in any of these
444lists, please let us know (also including whether or not they work).</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]445
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]446</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]447
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]448<!-- ======================================================================= -->
449<div class="doc_subsection">
450 <a name="c++-fe">Known problems with the C++ front-end</a>
451</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]452
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]453<div class="doc_text">
454
Reid Spencer55684c32004-12-07 08:39:08 +0000[diff] [blame]455<p>For this release, the C++ front-end is considered to be fully
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]456tested and works for a number of non-trivial programs, including LLVM
457itself.</p>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]458
459</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]460
461<!-- _______________________________________________________________________ -->
Chris Lattner141ebb62004-02-14 04:12:41 +0000[diff] [blame]462<div class="doc_subsubsection">Bugs</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]463
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]464<div class="doc_text">
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]465
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]466<ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]467<li>The C++ front-end inherits all problems afflicting the <a href="#c-fe">C
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]468 front-end</a>.</li>
Chris Lattner041e6c92004-07-17 02:04:41 +0000[diff] [blame]469
Chris Lattner5cd40922004-08-02 20:28:44 +0000[diff] [blame]470<li><b>IA-64 specific</b>: The C++ front-end does not use <a
471href="http://llvm.cs.uiuc.edu/PR406">IA64 ABI compliant layout of v-tables</a>.
Chris Lattner041e6c92004-07-17 02:04:41 +0000[diff] [blame]472In particular, it just stores function pointers instead of function
473descriptors in the vtable. This bug prevents mixing C++ code compiled with
Chris Lattner2fd93492004-08-02 20:29:51 +0000[diff] [blame]474LLVM with C++ objects compiled by other C++ compilers.</li>
Chris Lattner041e6c92004-07-17 02:04:41 +0000[diff] [blame]475
Chris Lattner5cd40922004-08-02 20:28:44 +0000[diff] [blame]476</ul>
477
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]478</div>
479
480<!-- _______________________________________________________________________ -->
481<div class="doc_subsubsection">
482 Notes
483</div>
484
485<div class="doc_text">
486
487<ul>
Chris Lattnerd2a74272003-10-27 18:30:37 +0000[diff] [blame]488
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]489<li>The C++ front-end is based on a pre-release of the GCC 3.4 C++ parser. This
490parser is significantly more standards compliant (and picky) than prior GCC
491versions. For more information, see the C++ section of the <a
Chris Lattnere76e9ab2003-12-12 04:25:33 +0000[diff] [blame]492href="http://gcc.gnu.org/gcc-3.4/changes.html">GCC 3.4 release notes</a>.</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]493
494<li>Destructors for local objects are not always run when a <tt>longjmp</tt> is
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]495 performed. In particular, destructors for objects in the <tt>longjmp</tt>ing
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]496 function and in the <tt>setjmp</tt> receiver function may not be run.
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]497 Objects in intervening stack frames will be destroyed, however (which is
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]498 better than most compilers).</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]499
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]500<li>The LLVM C++ front-end follows the <a
501 href="http://www.codesourcery.com/cxx-abi">Itanium C++ ABI</a>.
502 This document, which is not Itanium specific, specifies a standard for name
503 mangling, class layout, v-table layout, RTTI formats, and other C++
504 representation issues. Because we use this API, code generated by the LLVM
505 compilers should be binary compatible with machine code generated by other
506 Itanium ABI C++ compilers (such as G++, the Intel and HP compilers, etc).
507 <i>However</i>, the exception handling mechanism used by LLVM is very
508 different from the model used in the Itanium ABI, so <b>exceptions will not
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]509 interact correctly</b>. </li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]510
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]511</ul>
Chris Lattner46ecf612003-10-07 22:14:37 +0000[diff] [blame]512
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]513</div>
514
515<!-- ======================================================================= -->
516<div class="doc_subsection">
517 <a name="x86-be">Known problems with the X86 back-end</a>
518</div>
519
520<div class="doc_text">
521
522<ul>
Chris Lattner5cd40922004-08-02 20:28:44 +0000[diff] [blame]523 <li>none yet</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]524</ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]525
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]526</div>
527
528<!-- ======================================================================= -->
529<div class="doc_subsection">
Misha Brukmana516e992004-07-12 16:55:41 +0000[diff] [blame]530 <a name="sparcv9-be">Known problems with the SparcV9 back-end</a>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]531</div>
532
533<div class="doc_text">
534
535<ul>
Misha Brukmana516e992004-07-12 16:55:41 +0000[diff] [blame]536<li><a href="http://llvm.cs.uiuc.edu/PR60">[sparcv9] SparcV9 backend miscompiles
537several programs in the LLVM test suite</a></li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]538</ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]539
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]540</div>
541
542<!-- ======================================================================= -->
543<div class="doc_subsection">
Chris Lattnerdf925ce2004-11-07 01:55:32 +0000[diff] [blame]544 <a name="ppc-be">Known problems with the PowerPC back-end</a>
545</div>
546
547<div class="doc_text">
548
549<ul>
550<li>none yet</li>
551</ul>
552
553</div>
554
555<!-- ======================================================================= -->
556<div class="doc_subsection">
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]557 <a name="c-be">Known problems with the C back-end</a>
558</div>
559
560<div class="doc_text">
561
562<ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]563
564<li>The C back-end produces code that violates the ANSI C Type-Based Alias
565Analysis rules. As such, special options may be necessary to compile the code
566(for example, GCC requires the <tt>-fno-strict-aliasing</tt> option). This
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]567problem probably cannot be fixed.</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]568
Chris Lattnerc679fbb2003-11-04 20:06:53 +0000[diff] [blame]569<li><a href="http://llvm.cs.uiuc.edu/PR56">Zero arg vararg functions are not
Chris Lattnerb28c3282003-10-24 04:03:19 +0000[diff] [blame]570supported</a>. This should not affect LLVM produced by the C or C++
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]571frontends.</li>
Chris Lattnerb28c3282003-10-24 04:03:19 +0000[diff] [blame]572
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]573</ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]574
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]575</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]576
Andrew Lenharth2e18c622005-05-03 16:59:09 +0000[diff] [blame]577<!-- ======================================================================= -->
578<div class="doc_subsection">
579 <a name="alpha-be">Known problems with the Alpha back-end</a>
580</div>
581
582<div class="doc_text">
583
584<ul>
585
586<li>On 21164s, some rare FP arithmatic sequences which may trap do not have the appropriate nops inserted to ensure restartability.</li>
587
588<li>Vararg functions are not supported.</li>
589
590</ul>
591
592</div>
593
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]594<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]595<div class="doc_section">
596 <a name="additionalinfo">Additional Information</a>
597</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]598<!-- *********************************************************************** -->
599
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]600<div class="doc_text">
601
602<p>A wide variety of additional information is available on the LLVM web page,
Misha Brukman96158092005-03-30 19:14:24 +0000[diff] [blame]603including <a href="http://llvm.cs.uiuc.edu/docs/#maillist">mailing lists</a> and
604<a href="http://llvm.cs.uiuc.edu/pubs/">publications describing algorithms and
605components implemented in LLVM</a>. The web page also contains versions of the
606API documentation which is up-to-date with the CVS version of the source code.
607You can access versions of these documents specific to this release by going
608into the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]609
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]610<p>If you have any questions or comments about LLVM, please feel free to contact
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]611us via the <a href="http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev">mailing
612lists</a>.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]613
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]614</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]615
616<!-- *********************************************************************** -->
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]617
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]618<hr>
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]619<address>
Misha Brukman8834af92003-12-21 22:53:21 +0000[diff] [blame]620 <a href="http://jigsaw.w3.org/css-validator/check/referer"><img
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]621 src="http://jigsaw.w3.org/css-validator/images/vcss" alt="Valid CSS!"></a>
622 <a href="http://validator.w3.org/check/referer"><img
623 src="http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01!" /></a>
624
Misha Brukman7cb4e382003-11-22 01:00:11 +0000[diff] [blame]625 <a href="http://llvm.cs.uiuc.edu">The LLVM Compiler Infrastructure</a><br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]626 Last modified: $Date$
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]627</address>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]628
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]629</body>
630</html>