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gerrit-public.fairphone.software / toolchain / llvm-project / d8b33e0af62fd2f1542ab0ec5ae16a723d4a1951 / . / llvm / docs / ReleaseNotes.html
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Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]1<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
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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 Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame^]7 <title>LLVM 2.4 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 Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame^]11<div class="doc_title">LLVM 2.4 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>
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]15 <li><a href="#changes">Major Changes and Sub-project Status</a></li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]16 <li><a href="#whatsnew">What's New?</a></li>
Chris Lattner77a51732004-04-30 22:17:12 +0000[diff] [blame]17 <li><a href="GettingStarted.html">Installation Instructions</a></li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]18 <li><a href="#portability">Portability and Supported Platforms</a></li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]19 <li><a href="#knownproblems">Known Problems</a>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]20 <li><a href="#additionalinfo">Additional Information</a></li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]21</ol>
22
Chris Lattner020e1fc2004-05-23 21:07:27 +0000[diff] [blame]23<div class="doc_author">
Chris Lattnera69595e2005-10-29 07:07:09 +0000[diff] [blame]24 <p>Written by the <a href="http://llvm.org">LLVM Team</a><p>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]25</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]26
Chris Lattner6cb64032008-06-05 08:02:49 +0000[diff] [blame]27<!-- Done through Week-of-Mon-20080324.txt -->
28
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]29<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]30<div class="doc_section">
31 <a name="intro">Introduction</a>
32</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]33<!-- *********************************************************************** -->
34
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]35<div class="doc_text">
36
37<p>This document contains the release notes for the LLVM compiler
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame^]38infrastructure, release 2.4. Here we describe the status of LLVM, including
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]39major improvements from the previous release and any known problems. All LLVM
Chris Lattner98a33492007-05-09 04:58:11 +0000[diff] [blame]40releases may be downloaded from the <a href="http://llvm.org/releases/">LLVM
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]41releases web site</a>.</p>
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]42
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]43<p>For more information about LLVM, including information about the latest
Chris Lattnera69595e2005-10-29 07:07:09 +0000[diff] [blame]44release, please check out the <a href="http://llvm.org/">main LLVM
Chris Lattnere7525b52003-10-07 21:38:31 +0000[diff] [blame]45web site</a>. If you have questions or comments, the <a
46href="http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVM developer's mailing
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]47list</a> is a good place to send them.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]48
Reid Spencerc7f87f22007-07-09 08:04:31 +0000[diff] [blame]49<p>Note that if you are reading this file from a Subversion checkout or the
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]50main LLVM web page, this document applies to the <i>next</i> release, not the
51current one. To see the release notes for a specific releases, please see the
52<a href="http://llvm.org/releases/">releases page</a>.</p>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]53
54</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]55
56<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]57<div class="doc_section">
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]58 <a name="changes">Major Changes and Sub-project Status</a>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]59</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]60<!-- *********************************************************************** -->
61
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]62<div class="doc_text">
63
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame^]64<p>This is the fifteenth public release of the LLVM Compiler Infrastructure.
65It includes a large number of features and refinements from LLVM 2.3.</p>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]66
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]67</div>
68
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame^]69<!-- Unfinished features in 2.4:
Chris Lattner2b8a52e2008-02-10 07:46:44 +0000[diff] [blame]70 Machine LICM
71 Machine Sinking
72 LegalizeDAGTypes
73 -->
74
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]75<!--=========================================================================-->
Chris Lattner406bddf2005-05-15 05:44:51 +0000[diff] [blame]76<div class="doc_subsection">
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame^]77<a name="changes">Major Changes in LLVM 2.4</a>
Chris Lattnera2735862008-02-10 07:04:35 +0000[diff] [blame]78</div>
79
80<div class="doc_text">
81
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame^]82<p>....</p>
Chris Lattnerb076b002008-06-08 21:19:07 +0000[diff] [blame]83
Chris Lattner7795ea92008-06-08 02:45:07 +0000[diff] [blame]84<p>LLVM API Changes:</p>
Chris Lattner6cb64032008-06-05 08:02:49 +0000[diff] [blame]85
Chris Lattner7795ea92008-06-08 02:45:07 +0000[diff] [blame]86<ul>
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame^]87<li>....</li>
Chris Lattner7795ea92008-06-08 02:45:07 +0000[diff] [blame]88</ul>
Chris Lattnercdc44ed2008-02-06 18:00:06 +0000[diff] [blame]89</div>
90
91<!--=========================================================================-->
92<div class="doc_subsection">
Chris Lattner625a3d82008-06-08 21:34:41 +0000[diff] [blame]93<a name="otherprojects">Other LLVM Sub-Projects</a>
94</div>
95
96<div class="doc_text">
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]97<p>
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame^]98The core LLVM 2.4 distribution currently consists of code from the core LLVM
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]99repository (which roughly contains the LLVM optimizer, code generators and
100supporting tools) and the llvm-gcc repository. In addition to this code, the
101LLVM Project includes other sub-projects that are in development. The two which
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame^]102are the most actively developed are the <a href="#clang">Clang Project</a> and
103<a href="#vmkit">vmkit Project</a>.
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]104</p>
105</div>
106
107<!--=========================================================================-->
108<div class="doc_subsubsection">
109<a name="vmkit">vmkit</a>
110</div>
111
112<div class="doc_text">
113<p>
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame^]114The <a href="http://vmkit.llvm.org/">"vmkit" project</a> is an implementation of
115a JVM and a CLI Virtual Machines (Microsoft .NET is an
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]116implementation of the CLI) using the Just-In-Time compiler of LLVM.</p>
117
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame^]118<p>...</p>
Chris Lattner625a3d82008-06-08 21:34:41 +0000[diff] [blame]119
120</div>
121
122<!--=========================================================================-->
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]123<div class="doc_subsubsection">
124<a name="clang">Clang</a>
125</div>
126
127<div class="doc_text">
128
129<p>The <a href="http://clang.llvm.org/">Clang project</a> is an effort to build
130a set of new 'LLVM native' front-end technologies for the LLVM optimizer
131and code generator. Clang is continuing to make major strides forward in all
132areas. Its C and Objective-C parsing support is very solid, and the code
133generation support is far enough along to build many C applications. While not
134yet production quality, it is progressing very nicely. In addition, C++
135front-end work has started to make significant progress.</p>
136
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame^]137<p>Codegen progress/state
138</p>
139
140<p>
141<a href="http://clang.llvm.org/StaticAnalysis.html">static analysis tool</a>
142</p>
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]143
144</div>
145
146
147<!-- *********************************************************************** -->
148<div class="doc_section">
149 <a name="whatsnew">What's New?</a>
150</div>
151<!-- *********************************************************************** -->
152
Chris Lattnerb7bc2aa2008-06-08 22:59:35 +0000[diff] [blame]153<div class="doc_text">
154
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame^]155<p>LLVM 2.4 includes a huge number of bug fixes, performance tweaks and minor
Chris Lattnerb7bc2aa2008-06-08 22:59:35 +0000[diff] [blame]156improvements. Some of the major improvements and new features are listed in
157this section.
158</p>
159</div>
160
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]161<!--=========================================================================-->
Chris Lattner625a3d82008-06-08 21:34:41 +0000[diff] [blame]162<div class="doc_subsection">
Chris Lattnercdc44ed2008-02-06 18:00:06 +0000[diff] [blame]163<a name="majorfeatures">Major New Features</a>
164</div>
165
166<div class="doc_text">
167
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame^]168<p>LLVM 2.4 includes several major new capabilities:</p>
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]169
170<ul>
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame^]171<li>
172 <p>MRVs got generalized to FCAs.</p>
173 </li>
174
175<li><p>fast isel, -O0 compile times</p></li>
Chris Lattner625a3d82008-06-08 21:34:41 +0000[diff] [blame]176
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame^]177<li><p>Attrs changes?</p></li>
Chris Lattner618a99f2008-06-05 06:57:39 +0000[diff] [blame]178
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame^]179<li><p>...</p></li>
Chris Lattner618a99f2008-06-05 06:57:39 +0000[diff] [blame]180
Chris Lattner458e79f2008-02-10 08:18:42 +0000[diff] [blame]181</ul>
182
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]183</div>
184
Chris Lattnerb7112222008-06-05 06:25:56 +0000[diff] [blame]185
186<!--=========================================================================-->
187<div class="doc_subsection">
Chris Lattner625a3d82008-06-08 21:34:41 +0000[diff] [blame]188<a name="llvm-gcc">llvm-gcc 4.2 Improvements</a>
Chris Lattnerb7112222008-06-05 06:25:56 +0000[diff] [blame]189</div>
190
191<div class="doc_text">
192
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame^]193<p>LLVM 2.4 fully supports the llvm-gcc 4.2 front-end, and includes support
Chris Lattnerb7bc2aa2008-06-08 22:59:35 +0000[diff] [blame]194for the C, C++, Objective-C, Ada, and Fortran front-ends.</p>
Chris Lattnerb7112222008-06-05 06:25:56 +0000[diff] [blame]195
Chris Lattnerb7bc2aa2008-06-08 22:59:35 +0000[diff] [blame]196<p>
197<ul>
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame^]198<li>...</li>
Chris Lattnerb7bc2aa2008-06-08 22:59:35 +0000[diff] [blame]199
Gabor Greif7f39fb52008-06-09 06:06:18 +0000[diff] [blame]200</ul>
Chris Lattnerb7112222008-06-05 06:25:56 +0000[diff] [blame]201
Chris Lattnerb7112222008-06-05 06:25:56 +0000[diff] [blame]202</div>
203
204
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]205<!--=========================================================================-->
206<div class="doc_subsection">
Chris Lattnerdd6acc02008-02-10 08:17:19 +0000[diff] [blame]207<a name="coreimprovements">LLVM Core Improvements</a>
208</div>
209
210<div class="doc_text">
211<p>New features include:
212</p>
213
Chris Lattnerb7112222008-06-05 06:25:56 +0000[diff] [blame]214<ul>
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame^]215<li>...</li>
Chris Lattnerdd6acc02008-02-10 08:17:19 +0000[diff] [blame]216</ul>
217
218</div>
219
220<!--=========================================================================-->
221<div class="doc_subsection">
Chris Lattner2b8a52e2008-02-10 07:46:44 +0000[diff] [blame]222<a name="optimizer">Optimizer Improvements</a>
223</div>
224
225<div class="doc_text">
226
Chris Lattnerdd6acc02008-02-10 08:17:19 +0000[diff] [blame]227<p>In addition to a huge array of bug fixes and minor performance tweaks, the
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame^]228LLVM 2.4 optimizers support a few major enhancements:</p>
Chris Lattner2b8a52e2008-02-10 07:46:44 +0000[diff] [blame]229
230<ul>
231
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame^]232<li>.</li>
Chris Lattnerb7bc2aa2008-06-08 22:59:35 +0000[diff] [blame]233
Chris Lattner7795ea92008-06-08 02:45:07 +0000[diff] [blame]234</ul>
235
236</div>
237
238<!--=========================================================================-->
239<div class="doc_subsection">
240<a name="codegen">Code Generator Improvements</a>
241</div>
242
243<div class="doc_text">
244
245<p>We put a significant amount of work into the code generator infrastructure,
246which allows us to implement more aggressive algorithms and make it run
247faster:</p>
248
249<ul>
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame^]250<li>Selection dag speedups</li>
251<li>...</li>
Chris Lattner7795ea92008-06-08 02:45:07 +0000[diff] [blame]252
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]253</ul>
254
255</div>
256
257
258<!--=========================================================================-->
259<div class="doc_subsection">
Chris Lattner6cb64032008-06-05 08:02:49 +0000[diff] [blame]260<a name="x86specific">X86/X86-64 Specific Improvements</a>
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]261</div>
Chris Lattner727c3742007-05-18 06:33:02 +0000[diff] [blame]262
Chris Lattner89e761c2006-04-18 06:32:08 +0000[diff] [blame]263<div class="doc_text">
Chris Lattnerdd6acc02008-02-10 08:17:19 +0000[diff] [blame]264<p>New target-specific features include:
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]265</p>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]266
267<ul>
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame^]268<li>...</li>
Chris Lattnerb076b002008-06-08 21:19:07 +0000[diff] [blame]269
Chris Lattner8ce1ba42007-05-17 21:41:31 +0000[diff] [blame]270</ul>
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]271
Chris Lattner8ce1ba42007-05-17 21:41:31 +0000[diff] [blame]272</div>
Chris Lattner72a269f2006-03-03 00:34:26 +0000[diff] [blame]273
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]274<!--=========================================================================-->
275<div class="doc_subsection">
Chris Lattner6cb64032008-06-05 08:02:49 +0000[diff] [blame]276<a name="targetspecific">Other Target Specific Improvements</a>
277</div>
278
279<div class="doc_text">
280<p>New target-specific features include:
281</p>
282
283<ul>
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame^]284<li>....</li>
Chris Lattner6cb64032008-06-05 08:02:49 +0000[diff] [blame]285</ul>
286
287</div>
288
289
290
291<!--=========================================================================-->
292<div class="doc_subsection">
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]293<a name="otherimprovements">Other Improvements</a>
294</div>
295
296<div class="doc_text">
297<p>New features include:
298</p>
299
300<ul>
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame^]301<li>...</li>
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]302</ul>
303
304</div>
Chris Lattner72a269f2006-03-03 00:34:26 +0000[diff] [blame]305
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]306<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]307<div class="doc_section">
308 <a name="portability">Portability and Supported Platforms</a>
309</div>
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]310<!-- *********************************************************************** -->
311
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]312<div class="doc_text">
313
John Criswell64307722004-12-08 20:35:47 +0000[diff] [blame]314<p>LLVM is known to work on the following platforms:</p>
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]315
316<ul>
Gabor Greif80ae8a72008-06-05 18:39:01 +0000[diff] [blame]317<li>Intel and AMD machines (IA32) running Red Hat Linux, Fedora Core and FreeBSD
Reid Spencer9803b402005-05-17 02:47:27 +0000[diff] [blame]318 (and probably other unix-like systems).</li>
Chris Lattner7422bce2008-02-06 06:30:34 +0000[diff] [blame]319<li>PowerPC and X86-based Mac OS X systems, running 10.3 and above in 32-bit and
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]320 64-bit modes.</li>
Chris Lattnercdc44ed2008-02-06 18:00:06 +0000[diff] [blame]321<li>Intel and AMD machines running on Win32 using MinGW libraries (native).</li>
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]322<li>Intel and AMD machines running on Win32 with the Cygwin libraries (limited
323 support is available for native builds with Visual C++).</li>
Gabor Greif80ae8a72008-06-05 18:39:01 +0000[diff] [blame]324<li>Sun UltraSPARC workstations running Solaris 10.</li>
John Criswelld5234922005-05-13 20:28:15 +0000[diff] [blame]325<li>Alpha-based machines running Debian GNU/Linux.</li>
Gabor Greif80ae8a72008-06-05 18:39:01 +0000[diff] [blame]326<li>Itanium-based (IA64) machines running Linux and HP-UX.</li>
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]327</ul>
328
Chris Lattner618a99f2008-06-05 06:57:39 +0000[diff] [blame]329<p>The core LLVM infrastructure uses GNU autoconf to adapt itself
Brian Gaekee3e557e2004-05-09 05:28:35 +0000[diff] [blame]330to the machine and operating system on which it is built. However, minor
331porting may be required to get LLVM to work on new platforms. We welcome your
332portability patches and reports of successful builds or error messages.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]333
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]334</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]335
336<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]337<div class="doc_section">
338 <a name="knownproblems">Known Problems</a>
339</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]340<!-- *********************************************************************** -->
341
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]342<div class="doc_text">
343
344<p>This section contains all known problems with the LLVM system, listed by
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]345component. As new problems are discovered, they will be added to these
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]346sections. If you run into a problem, please check the <a
Chris Lattnera69595e2005-10-29 07:07:09 +0000[diff] [blame]347href="http://llvm.org/bugs/">LLVM bug database</a> and submit a bug if
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]348there isn't already one.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]349
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]350</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]351
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]352<!-- ======================================================================= -->
353<div class="doc_subsection">
354 <a name="experimental">Experimental features included with this release</a>
355</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]356
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]357<div class="doc_text">
358
Misha Brukmanfa50a222004-05-12 21:46:05 +0000[diff] [blame]359<p>The following components of this LLVM release are either untested, known to
360be broken or unreliable, or are in early development. These components should
361not be relied on, and bugs should not be filed against them, but they may be
362useful to some people. In particular, if you would like to work on one of these
Chris Lattnere38ac152008-02-12 06:29:45 +0000[diff] [blame]363components, please contact us on the <a
364href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVMdev list</a>.</p>
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]365
366<ul>
Chris Lattnere38ac152008-02-12 06:29:45 +0000[diff] [blame]367<li>The MSIL, IA64, Alpha, SPU, and MIPS backends are experimental.</li>
Duncan Sands56448462008-06-08 20:18:35 +0000[diff] [blame]368<li>The llc "<tt>-filetype=asm</tt>" (the default) is the only supported
Chris Lattner7422bce2008-02-06 06:30:34 +0000[diff] [blame]369 value for this option.</li>
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]370</ul>
371
372</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]373
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]374<!-- ======================================================================= -->
375<div class="doc_subsection">
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]376 <a name="x86-be">Known problems with the X86 back-end</a>
John Criswell3bdbd302005-11-08 21:11:33 +0000[diff] [blame]377</div>
378
379<div class="doc_text">
380
381<ul>
Anton Korobeynikov486c7d32008-06-08 10:24:13 +0000[diff] [blame]382 <li>The X86 backend does not yet support
383 all <a href="http://llvm.org/PR879">inline assembly that uses the X86
384 floating point stack</a>. It supports the 'f' and 't' constraints, but not
385 'u'.</li>
Chris Lattnerb076b002008-06-08 21:19:07 +0000[diff] [blame]386 <li>The X86 backend generates inefficient floating point code when configured
387 to generate code for systems that don't have SSE2.</li>
Duncan Sands0bc15262008-06-08 19:38:43 +0000[diff] [blame]388 <li>Win64 code generation wasn't widely tested. Everything should work, but we
Anton Korobeynikov486c7d32008-06-08 10:24:13 +0000[diff] [blame]389 expect small issues to happen. Also, llvm-gcc cannot build mingw64 runtime
390 currently due
391 to <a href="http://llvm.org/PR2255">several</a>
Chris Lattner54d12102008-06-08 23:12:47 +0000[diff] [blame]392 <a href="http://llvm.org/PR2257">bugs</a> due to lack of support for the
393 'u' inline assembly constraint and X87 floating point inline assembly.</li>
Dan Gohman721b3722008-06-08 23:05:11 +0000[diff] [blame]394 <li>The X86-64 backend does not yet support position-independent code (PIC)
395 generation on Linux targets.</li>
396 <li>The X86-64 backend does not yet support the LLVM IR instruction
397 <tt>va_arg</tt>. Currently, the llvm-gcc front-end supports variadic
398 argument constructs on X86-64 by lowering them manually.</li>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]399</ul>
400
401</div>
402
403<!-- ======================================================================= -->
404<div class="doc_subsection">
405 <a name="ppc-be">Known problems with the PowerPC back-end</a>
406</div>
407
408<div class="doc_text">
409
410<ul>
Nicolas Geoffray77d99502007-05-15 09:21:28 +0000[diff] [blame]411<li>The Linux PPC32/ABI support needs testing for the interpreter and static
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]412compilation, and lacks support for debug information.</li>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]413</ul>
414
415</div>
416
417<!-- ======================================================================= -->
418<div class="doc_subsection">
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]419 <a name="arm-be">Known problems with the ARM back-end</a>
420</div>
421
422<div class="doc_text">
423
424<ul>
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]425<li>Thumb mode works only on ARMv6 or higher processors. On sub-ARMv6
Duncan Sands47fc0a22007-09-26 15:59:54 +0000[diff] [blame]426processors, thumb programs can crash or produce wrong
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]427results (<a href="http://llvm.org/PR1388">PR1388</a>).</li>
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]428<li>Compilation for ARM Linux OABI (old ABI) is supported, but not fully tested.
429</li>
Chris Lattnerb076b002008-06-08 21:19:07 +0000[diff] [blame]430<li>There is a bug in QEMU-ARM (&lt;= 0.9.0) which causes it to incorrectly
431 execute
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]432programs compiled with LLVM. Please use more recent versions of QEMU.</li>
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]433</ul>
434
435</div>
436
437<!-- ======================================================================= -->
438<div class="doc_subsection">
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]439 <a name="sparc-be">Known problems with the SPARC back-end</a>
440</div>
441
442<div class="doc_text">
443
444<ul>
445<li>The SPARC backend only supports the 32-bit SPARC ABI (-m32), it does not
446 support the 64-bit SPARC ABI (-m64).</li>
447</ul>
448
449</div>
450
451<!-- ======================================================================= -->
452<div class="doc_subsection">
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]453 <a name="alpha-be">Known problems with the Alpha back-end</a>
454</div>
455
456<div class="doc_text">
457
458<ul>
459
460<li>On 21164s, some rare FP arithmetic sequences which may trap do not have the
461appropriate nops inserted to ensure restartability.</li>
462
John Criswell3bdbd302005-11-08 21:11:33 +0000[diff] [blame]463</ul>
464</div>
465
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]466<!-- ======================================================================= -->
467<div class="doc_subsection">
468 <a name="ia64-be">Known problems with the IA64 back-end</a>
469</div>
470
471<div class="doc_text">
472
473<ul>
Chris Lattner54d12102008-06-08 23:12:47 +0000[diff] [blame]474<li>The Itanium backend is highly experimental, and has a number of known
475 issues. We are looking for a maintainer for the Itanium backend. If you
476 are interested, please contact the llvmdev mailing list.</li>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]477</ul>
478
479</div>
480
481<!-- ======================================================================= -->
482<div class="doc_subsection">
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]483 <a name="c-be">Known problems with the C back-end</a>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]484</div>
485
486<div class="doc_text">
487
488<ul>
Chris Lattnera1a4c9a2008-06-05 06:35:40 +0000[diff] [blame]489<li><a href="http://llvm.org/PR802">The C backend has only basic support for
490 inline assembly code</a>.</li>
Chris Lattner8e061162007-09-26 06:01:35 +0000[diff] [blame]491<li><a href="http://llvm.org/PR1658">The C backend violates the ABI of common
492 C++ programs</a>, preventing intermixing between C++ compiled by the CBE and
Duncan Sands56448462008-06-08 20:18:35 +0000[diff] [blame]493 C++ code compiled with llc or native compilers.</li>
Duncan Sandse09506a2008-02-10 13:40:55 +0000[diff] [blame]494<li>The C backend does not support all exception handling constructs.</li>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]495</ul>
496
497</div>
John Criswell3bdbd302005-11-08 21:11:33 +0000[diff] [blame]498
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]499
500<!-- ======================================================================= -->
501<div class="doc_subsection">
Chris Lattnera1a4c9a2008-06-05 06:35:40 +0000[diff] [blame]502 <a name="c-fe">Known problems with the llvm-gcc C front-end</a>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]503</div>
Chris Lattner178f3db2003-10-02 05:07:23 +0000[diff] [blame]504
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]505<div class="doc_text">
Chris Lattner72a269f2006-03-03 00:34:26 +0000[diff] [blame]506
Chris Lattnercdc44ed2008-02-06 18:00:06 +0000[diff] [blame]507<p>llvm-gcc does not currently support <a href="http://llvm.org/PR869">Link-Time
508Optimization</a> on most platforms "out-of-the-box". Please inquire on the
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]509llvmdev mailing list if you are interested.</p>
Chris Lattner44124232006-08-08 17:27:28 +0000[diff] [blame]510
Chris Lattnera1a4c9a2008-06-05 06:35:40 +0000[diff] [blame]511<p>The only major language feature of GCC not supported by llvm-gcc is
512 the <tt>__builtin_apply</tt> family of builtins. However, some extensions
513 are only supported on some targets. For example, trampolines are only
Duncan Sands56448462008-06-08 20:18:35 +0000[diff] [blame]514 supported on some targets (these are used when you take the address of a
515 nested function).</p>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]516
Chris Lattnera1a4c9a2008-06-05 06:35:40 +0000[diff] [blame]517<p>If you run into GCC extensions which are not supported, please let us know.
518</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]519
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]520</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]521
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]522<!-- ======================================================================= -->
523<div class="doc_subsection">
Chris Lattnera1a4c9a2008-06-05 06:35:40 +0000[diff] [blame]524 <a name="c++-fe">Known problems with the llvm-gcc C++ front-end</a>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]525</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]526
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]527<div class="doc_text">
528
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]529<p>The C++ front-end is considered to be fully
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]530tested and works for a number of non-trivial programs, including LLVM
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]531itself, Qt, Mozilla, etc.</p>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]532
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]533<ul>
Chris Lattnera1a4c9a2008-06-05 06:35:40 +0000[diff] [blame]534<li>Exception handling works well on the X86 and PowerPC targets, including
Duncan Sands56448462008-06-08 20:18:35 +0000[diff] [blame]535X86-64 darwin. This works when linking to a libstdc++ compiled by GCC. It is
536supported on X86-64 linux, but that is disabled by default in this release.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]537</ul>
Chris Lattner46ecf612003-10-07 22:14:37 +0000[diff] [blame]538
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]539</div>
540
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]541
Chris Lattnere38ac152008-02-12 06:29:45 +0000[diff] [blame]542<!-- ======================================================================= -->
543<div class="doc_subsection">
Chris Lattnera1a4c9a2008-06-05 06:35:40 +0000[diff] [blame]544 <a name="ada-fe">Known problems with the llvm-gcc Ada front-end</a>
Chris Lattnere38ac152008-02-12 06:29:45 +0000[diff] [blame]545</div>
546
547<div class="doc_text">
548The llvm-gcc 4.2 Ada compiler works fairly well, however this is not a mature
549technology and problems should be expected.
550<ul>
Duncan Sands56448462008-06-08 20:18:35 +0000[diff] [blame]551<li>The Ada front-end currently only builds on X86-32. This is mainly due
Chris Lattnere38ac152008-02-12 06:29:45 +0000[diff] [blame]552to lack of trampoline support (pointers to nested functions) on other platforms,
Duncan Sands56448462008-06-08 20:18:35 +0000[diff] [blame]553however it <a href="http://llvm.org/PR2006">also fails to build on X86-64</a>
Chris Lattnere38ac152008-02-12 06:29:45 +0000[diff] [blame]554which does support trampolines.</li>
555<li>The Ada front-end <a href="http://llvm.org/PR2007">fails to bootstrap</a>.
556Workaround: configure with --disable-bootstrap.</li>
557<li>The c380004 and <a href="http://llvm.org/PR2010">c393010</a> ACATS tests
Duncan Sands56448462008-06-08 20:18:35 +0000[diff] [blame]558fail (c380004 also fails with gcc-4.2 mainline). When built at -O3, the
559<a href="http://llvm.org/PR2421">cxg2021</a> ACATS test also fails.</li>
560<li>Some gcc specific Ada tests continue to crash the compiler. The testsuite
561reports most tests as having failed even though they pass.</li>
Chris Lattnere38ac152008-02-12 06:29:45 +0000[diff] [blame]562<li>The -E binder option (exception backtraces)
563<a href="http://llvm.org/PR1982">does not work</a> and will result in programs
564crashing if an exception is raised. Workaround: do not use -E.</li>
565<li>Only discrete types <a href="http://llvm.org/PR1981">are allowed to start
566or finish at a non-byte offset</a> in a record. Workaround: do not pack records
567or use representation clauses that result in a field of a non-discrete type
568starting or finishing in the middle of a byte.</li>
Chris Lattnerb076b002008-06-08 21:19:07 +0000[diff] [blame]569<li>The <tt>lli</tt> interpreter <a href="http://llvm.org/PR2009">considers
570'main' as generated by the Ada binder to be invalid</a>.
571Workaround: hand edit the file to use pointers for <tt>argv</tt> and
572<tt>envp</tt> rather than integers.</li>
573<li>The <tt>-fstack-check</tt> option <a href="http://llvm.org/PR2008">is
574ignored</a>.</li>
Chris Lattnere38ac152008-02-12 06:29:45 +0000[diff] [blame]575</ul>
576</div>
577
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]578<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]579<div class="doc_section">
580 <a name="additionalinfo">Additional Information</a>
581</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]582<!-- *********************************************************************** -->
583
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]584<div class="doc_text">
585
Chris Lattnercb5596d2005-05-16 17:13:10 +0000[diff] [blame]586<p>A wide variety of additional information is available on the <a
Chris Lattnere0c1df42007-05-18 00:44:29 +0000[diff] [blame]587href="http://llvm.org">LLVM web page</a>, in particular in the <a
588href="http://llvm.org/docs/">documentation</a> section. The web page also
Reid Spencerc7f87f22007-07-09 08:04:31 +0000[diff] [blame]589contains versions of the API documentation which is up-to-date with the
590Subversion version of the source code.
Misha Brukman96158092005-03-30 19:14:24 +0000[diff] [blame]591You can access versions of these documents specific to this release by going
592into the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]593
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]594<p>If you have any questions or comments about LLVM, please feel free to contact
Chris Lattnera69595e2005-10-29 07:07:09 +0000[diff] [blame]595us via the <a href="http://llvm.org/docs/#maillist"> mailing
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]596lists</a>.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]597
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]598</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]599
600<!-- *********************************************************************** -->
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]601
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]602<hr>
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]603<address>
Misha Brukman8834af92003-12-21 22:53:21 +0000[diff] [blame]604 <a href="http://jigsaw.w3.org/css-validator/check/referer"><img
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]605 src="http://jigsaw.w3.org/css-validator/images/vcss" alt="Valid CSS!"></a>
606 <a href="http://validator.w3.org/check/referer"><img
Chris Lattner458e79f2008-02-10 08:18:42 +0000[diff] [blame]607 src="http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01!"></a>
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]608
Chris Lattnere0c1df42007-05-18 00:44:29 +0000[diff] [blame]609 <a href="http://llvm.org/">LLVM Compiler Infrastructure</a><br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]610 Last modified: $Date$
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]611</address>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]612
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]613</body>
614</html>