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4<head>
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Chris Lattner857fb132008-10-11 18:18:28 +0000[diff] [blame]7 <title>LLVM 2.4 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 Lattner857fb132008-10-11 18:18:28 +0000[diff] [blame]11<div class="doc_title">LLVM 2.4 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>
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]15 <li><a href="#changes">Major Changes and Sub-project Status</a></li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]16 <li><a href="#whatsnew">What's New?</a></li>
Chris Lattner4b538b92004-04-30 22:17:12 +0000[diff] [blame]17 <li><a href="GettingStarted.html">Installation Instructions</a></li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]18 <li><a href="#portability">Portability and Supported Platforms</a></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]19 <li><a href="#knownproblems">Known Problems</a>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]20 <li><a href="#additionalinfo">Additional Information</a></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]21</ol>
22
Chris Lattner7911ce22004-05-23 21:07:27 +0000[diff] [blame]23<div class="doc_author">
Chris Lattnerc463b272005-10-29 07:07:09 +0000[diff] [blame]24 <p>Written by the <a href="http://llvm.org">LLVM Team</a><p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]25</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]26
Chris Lattner77d29b12008-06-05 08:02:49 +0000[diff] [blame]27<!-- Done through Week-of-Mon-20080324.txt -->
28
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]29<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]30<div class="doc_section">
31 <a name="intro">Introduction</a>
32</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]33<!-- *********************************************************************** -->
34
Misha Brukman500bc302003-11-22 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 Lattner857fb132008-10-11 18:18:28 +0000[diff] [blame]38infrastructure, release 2.4. Here we describe the status of LLVM, including
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]39major improvements from the previous release and any known problems. All LLVM
Chris Lattnercaf06342007-05-09 04:58:11 +0000[diff] [blame]40releases may be downloaded from the <a href="http://llvm.org/releases/">LLVM
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]41releases web site</a>.</p>
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]42
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame]43<p>For more information about LLVM, including information about the latest
Chris Lattnerc463b272005-10-29 07:07:09 +0000[diff] [blame]44release, please check out the <a href="http://llvm.org/">main LLVM
Chris Lattner47ad72c2003-10-07 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 Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]47list</a> is a good place to send them.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]48
Reid Spencer669ed452007-07-09 08:04:31 +0000[diff] [blame]49<p>Note that if you are reading this file from a Subversion checkout or the
Chris Lattner84977642007-09-21 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 Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]53
54</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]55
56<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]57<div class="doc_section">
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]58 <a name="changes">Major Changes and Sub-project Status</a>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]59</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]60<!-- *********************************************************************** -->
61
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]62<div class="doc_text">
63
Chris Lattner857fb132008-10-11 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 Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]66
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]67</div>
68
Chris Lattner857fb132008-10-11 18:18:28 +0000[diff] [blame]69<!-- Unfinished features in 2.4:
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]70 Machine LICM
71 Machine Sinking
72 LegalizeDAGTypes
73 -->
74
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]75<!--=========================================================================-->
Chris Lattner8a458762005-05-15 05:44:51 +0000[diff] [blame]76<div class="doc_subsection">
Chris Lattner857fb132008-10-11 18:18:28 +0000[diff] [blame]77<a name="changes">Major Changes in LLVM 2.4</a>
Chris Lattnerb4c68cd2008-02-10 07:04:35 +0000[diff] [blame]78</div>
79
80<div class="doc_text">
81
Chris Lattner857fb132008-10-11 18:18:28 +0000[diff] [blame]82<p>....</p>
Chris Lattnere6e1b352008-06-08 21:19:07 +0000[diff] [blame]83
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]84<p>LLVM API Changes:</p>
Chris Lattner77d29b12008-06-05 08:02:49 +0000[diff] [blame]85
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]86<ul>
Chris Lattner857fb132008-10-11 18:18:28 +0000[diff] [blame]87<li>....</li>
Daniel Dunbar43778b32008-10-11 21:26:56 +0000[diff] [blame]88
89<li>... Attributes changes ... </li>
90
91<li>The <tt>DbgStopPointInst</tt> methods <tt>getDirectory</tt> and <tt>getFileName</tt> now return <tt>Value*</tt> instead of strings. These can be converted to strings using <tt>llvm::GetConstantStringInfo</tt> defined via "llvm/Analysis/ValueTracking.h".
92
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]93</ul>
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]94</div>
95
96<!--=========================================================================-->
97<div class="doc_subsection">
Chris Lattnerea34f642008-06-08 21:34:41 +0000[diff] [blame]98<a name="otherprojects">Other LLVM Sub-Projects</a>
99</div>
100
101<div class="doc_text">
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]102<p>
Chris Lattner857fb132008-10-11 18:18:28 +0000[diff] [blame]103The core LLVM 2.4 distribution currently consists of code from the core LLVM
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]104repository (which roughly contains the LLVM optimizer, code generators and
105supporting tools) and the llvm-gcc repository. In addition to this code, the
106LLVM Project includes other sub-projects that are in development. The two which
Chris Lattner857fb132008-10-11 18:18:28 +0000[diff] [blame]107are the most actively developed are the <a href="#clang">Clang Project</a> and
108<a href="#vmkit">vmkit Project</a>.
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]109</p>
110</div>
111
112<!--=========================================================================-->
113<div class="doc_subsubsection">
114<a name="vmkit">vmkit</a>
115</div>
116
117<div class="doc_text">
118<p>
Chris Lattner857fb132008-10-11 18:18:28 +0000[diff] [blame]119The <a href="http://vmkit.llvm.org/">"vmkit" project</a> is an implementation of
120a JVM and a CLI Virtual Machines (Microsoft .NET is an
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]121implementation of the CLI) using the Just-In-Time compiler of LLVM.</p>
122
Chris Lattner857fb132008-10-11 18:18:28 +0000[diff] [blame]123<p>...</p>
Chris Lattnerea34f642008-06-08 21:34:41 +0000[diff] [blame]124
125</div>
126
127<!--=========================================================================-->
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]128<div class="doc_subsubsection">
129<a name="clang">Clang</a>
130</div>
131
132<div class="doc_text">
133
134<p>The <a href="http://clang.llvm.org/">Clang project</a> is an effort to build
135a set of new 'LLVM native' front-end technologies for the LLVM optimizer
136and code generator. Clang is continuing to make major strides forward in all
137areas. Its C and Objective-C parsing support is very solid, and the code
138generation support is far enough along to build many C applications. While not
139yet production quality, it is progressing very nicely. In addition, C++
140front-end work has started to make significant progress.</p>
141
Chris Lattner857fb132008-10-11 18:18:28 +0000[diff] [blame]142<p>Codegen progress/state
143</p>
144
145<p>
146<a href="http://clang.llvm.org/StaticAnalysis.html">static analysis tool</a>
147</p>
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]148
149</div>
150
151
152<!-- *********************************************************************** -->
153<div class="doc_section">
154 <a name="whatsnew">What's New?</a>
155</div>
156<!-- *********************************************************************** -->
157
Chris Lattnerf8e0b4e2008-06-08 22:59:35 +0000[diff] [blame]158<div class="doc_text">
159
Chris Lattner857fb132008-10-11 18:18:28 +0000[diff] [blame]160<p>LLVM 2.4 includes a huge number of bug fixes, performance tweaks and minor
Chris Lattnerf8e0b4e2008-06-08 22:59:35 +0000[diff] [blame]161improvements. Some of the major improvements and new features are listed in
162this section.
163</p>
164</div>
165
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]166<!--=========================================================================-->
Chris Lattnerea34f642008-06-08 21:34:41 +0000[diff] [blame]167<div class="doc_subsection">
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]168<a name="majorfeatures">Major New Features</a>
169</div>
170
171<div class="doc_text">
172
Chris Lattner857fb132008-10-11 18:18:28 +0000[diff] [blame]173<p>LLVM 2.4 includes several major new capabilities:</p>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]174
175<ul>
Chris Lattner857fb132008-10-11 18:18:28 +0000[diff] [blame]176<li>
177 <p>MRVs got generalized to FCAs.</p>
178 </li>
179
180<li><p>fast isel, -O0 compile times</p></li>
Chris Lattnerea34f642008-06-08 21:34:41 +0000[diff] [blame]181
Chris Lattner857fb132008-10-11 18:18:28 +0000[diff] [blame]182<li><p>Attrs changes?</p></li>
Chris Lattnerbc5786b2008-06-05 06:57:39 +0000[diff] [blame]183
Chris Lattner857fb132008-10-11 18:18:28 +0000[diff] [blame]184<li><p>...</p></li>
Chris Lattnerbc5786b2008-06-05 06:57:39 +0000[diff] [blame]185
Chris Lattner8170c102008-02-10 08:18:42 +0000[diff] [blame]186</ul>
187
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]188</div>
189
Chris Lattner791f77b2008-06-05 06:25:56 +0000[diff] [blame]190
191<!--=========================================================================-->
192<div class="doc_subsection">
Chris Lattnerea34f642008-06-08 21:34:41 +0000[diff] [blame]193<a name="llvm-gcc">llvm-gcc 4.2 Improvements</a>
Chris Lattner791f77b2008-06-05 06:25:56 +0000[diff] [blame]194</div>
195
196<div class="doc_text">
197
Chris Lattner857fb132008-10-11 18:18:28 +0000[diff] [blame]198<p>LLVM 2.4 fully supports the llvm-gcc 4.2 front-end, and includes support
Chris Lattnerf8e0b4e2008-06-08 22:59:35 +0000[diff] [blame]199for the C, C++, Objective-C, Ada, and Fortran front-ends.</p>
Chris Lattner791f77b2008-06-05 06:25:56 +0000[diff] [blame]200
Chris Lattnerf8e0b4e2008-06-08 22:59:35 +0000[diff] [blame]201<p>
202<ul>
Chris Lattner857fb132008-10-11 18:18:28 +0000[diff] [blame]203<li>...</li>
Chris Lattnerf8e0b4e2008-06-08 22:59:35 +0000[diff] [blame]204
Gabor Greifa3bd11d2008-06-09 06:06:18 +0000[diff] [blame]205</ul>
Chris Lattner791f77b2008-06-05 06:25:56 +0000[diff] [blame]206
Chris Lattner791f77b2008-06-05 06:25:56 +0000[diff] [blame]207</div>
208
209
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]210<!--=========================================================================-->
211<div class="doc_subsection">
Chris Lattnerf304ffc2008-02-10 08:17:19 +0000[diff] [blame]212<a name="coreimprovements">LLVM Core Improvements</a>
213</div>
214
215<div class="doc_text">
216<p>New features include:
217</p>
218
Chris Lattner791f77b2008-06-05 06:25:56 +0000[diff] [blame]219<ul>
Chris Lattner857fb132008-10-11 18:18:28 +0000[diff] [blame]220<li>...</li>
Chris Lattnerf304ffc2008-02-10 08:17:19 +0000[diff] [blame]221</ul>
222
223</div>
224
225<!--=========================================================================-->
226<div class="doc_subsection">
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]227<a name="optimizer">Optimizer Improvements</a>
228</div>
229
230<div class="doc_text">
231
Chris Lattnerf304ffc2008-02-10 08:17:19 +0000[diff] [blame]232<p>In addition to a huge array of bug fixes and minor performance tweaks, the
Chris Lattner857fb132008-10-11 18:18:28 +0000[diff] [blame]233LLVM 2.4 optimizers support a few major enhancements:</p>
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]234
235<ul>
236
Chris Lattner857fb132008-10-11 18:18:28 +0000[diff] [blame]237<li>.</li>
Chris Lattnerf8e0b4e2008-06-08 22:59:35 +0000[diff] [blame]238
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]239</ul>
240
241</div>
242
243<!--=========================================================================-->
244<div class="doc_subsection">
245<a name="codegen">Code Generator Improvements</a>
246</div>
247
248<div class="doc_text">
249
250<p>We put a significant amount of work into the code generator infrastructure,
251which allows us to implement more aggressive algorithms and make it run
252faster:</p>
253
254<ul>
Chris Lattner857fb132008-10-11 18:18:28 +0000[diff] [blame]255<li>Selection dag speedups</li>
256<li>...</li>
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]257
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]258</ul>
259
260</div>
261
262
263<!--=========================================================================-->
264<div class="doc_subsection">
Chris Lattner77d29b12008-06-05 08:02:49 +0000[diff] [blame]265<a name="x86specific">X86/X86-64 Specific Improvements</a>
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]266</div>
Chris Lattner60893e52007-05-18 06:33:02 +0000[diff] [blame]267
Chris Lattner738bd302006-04-18 06:32:08 +0000[diff] [blame]268<div class="doc_text">
Chris Lattnerf304ffc2008-02-10 08:17:19 +0000[diff] [blame]269<p>New target-specific features include:
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]270</p>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]271
272<ul>
Anton Korobeynikov0021fc12008-10-11 18:27:16 +0000[diff] [blame]273<li>Exception handling is supported by default on x86-64 linux platform.</li>
Chris Lattner857fb132008-10-11 18:18:28 +0000[diff] [blame]274<li>...</li>
Chris Lattnere6e1b352008-06-08 21:19:07 +0000[diff] [blame]275
Chris Lattnerbfb17ab2007-05-17 21:41:31 +0000[diff] [blame]276</ul>
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]277
Chris Lattnerbfb17ab2007-05-17 21:41:31 +0000[diff] [blame]278</div>
Chris Lattnerc5d658a2006-03-03 00:34:26 +0000[diff] [blame]279
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]280<!--=========================================================================-->
281<div class="doc_subsection">
Chris Lattner77d29b12008-06-05 08:02:49 +0000[diff] [blame]282<a name="targetspecific">Other Target Specific Improvements</a>
283</div>
284
285<div class="doc_text">
286<p>New target-specific features include:
287</p>
288
289<ul>
Chris Lattner857fb132008-10-11 18:18:28 +0000[diff] [blame]290<li>....</li>
Chris Lattner77d29b12008-06-05 08:02:49 +0000[diff] [blame]291</ul>
292
293</div>
294
295
296
297<!--=========================================================================-->
298<div class="doc_subsection">
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]299<a name="otherimprovements">Other Improvements</a>
300</div>
301
302<div class="doc_text">
303<p>New features include:
304</p>
305
306<ul>
Chris Lattner857fb132008-10-11 18:18:28 +0000[diff] [blame]307<li>...</li>
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]308</ul>
309
310</div>
Chris Lattnerc5d658a2006-03-03 00:34:26 +0000[diff] [blame]311
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]312<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]313<div class="doc_section">
314 <a name="portability">Portability and Supported Platforms</a>
315</div>
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]316<!-- *********************************************************************** -->
317
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]318<div class="doc_text">
319
John Criswell0b5b5e92004-12-08 20:35:47 +0000[diff] [blame]320<p>LLVM is known to work on the following platforms:</p>
Chris Lattner4654bdb2004-06-01 18:22:41 +0000[diff] [blame]321
322<ul>
Gabor Greif96a89c72008-06-05 18:39:01 +0000[diff] [blame]323<li>Intel and AMD machines (IA32) running Red Hat Linux, Fedora Core and FreeBSD
Reid Spencer00812e22005-05-17 02:47:27 +0000[diff] [blame]324 (and probably other unix-like systems).</li>
Chris Lattner000c73b2008-02-06 06:30:34 +0000[diff] [blame]325<li>PowerPC and X86-based Mac OS X systems, running 10.3 and above in 32-bit and
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]326 64-bit modes.</li>
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]327<li>Intel and AMD machines running on Win32 using MinGW libraries (native).</li>
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]328<li>Intel and AMD machines running on Win32 with the Cygwin libraries (limited
329 support is available for native builds with Visual C++).</li>
Gabor Greif96a89c72008-06-05 18:39:01 +0000[diff] [blame]330<li>Sun UltraSPARC workstations running Solaris 10.</li>
John Criswell9321fa82005-05-13 20:28:15 +0000[diff] [blame]331<li>Alpha-based machines running Debian GNU/Linux.</li>
Gabor Greif96a89c72008-06-05 18:39:01 +0000[diff] [blame]332<li>Itanium-based (IA64) machines running Linux and HP-UX.</li>
Chris Lattner4654bdb2004-06-01 18:22:41 +0000[diff] [blame]333</ul>
334
Chris Lattnerbc5786b2008-06-05 06:57:39 +0000[diff] [blame]335<p>The core LLVM infrastructure uses GNU autoconf to adapt itself
Brian Gaekeb0fd7612004-05-09 05:28:35 +0000[diff] [blame]336to the machine and operating system on which it is built. However, minor
337porting may be required to get LLVM to work on new platforms. We welcome your
338portability patches and reports of successful builds or error messages.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]339
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]340</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]341
342<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]343<div class="doc_section">
344 <a name="knownproblems">Known Problems</a>
345</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]346<!-- *********************************************************************** -->
347
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]348<div class="doc_text">
349
350<p>This section contains all known problems with the LLVM system, listed by
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]351component. As new problems are discovered, they will be added to these
Chris Lattner5eccca42003-12-12 21:22:16 +0000[diff] [blame]352sections. If you run into a problem, please check the <a
Chris Lattnerc463b272005-10-29 07:07:09 +0000[diff] [blame]353href="http://llvm.org/bugs/">LLVM bug database</a> and submit a bug if
Chris Lattner5eccca42003-12-12 21:22:16 +0000[diff] [blame]354there isn't already one.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]355
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]356</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]357
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]358<!-- ======================================================================= -->
359<div class="doc_subsection">
360 <a name="experimental">Experimental features included with this release</a>
361</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]362
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]363<div class="doc_text">
364
Misha Brukman6df9e2c2004-05-12 21:46:05 +0000[diff] [blame]365<p>The following components of this LLVM release are either untested, known to
366be broken or unreliable, or are in early development. These components should
367not be relied on, and bugs should not be filed against them, but they may be
368useful to some people. In particular, if you would like to work on one of these
Chris Lattner2b659ef2008-02-12 06:29:45 +0000[diff] [blame]369components, please contact us on the <a
370href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVMdev list</a>.</p>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]371
372<ul>
Chris Lattner2b659ef2008-02-12 06:29:45 +0000[diff] [blame]373<li>The MSIL, IA64, Alpha, SPU, and MIPS backends are experimental.</li>
Duncan Sands27aff872008-06-08 20:18:35 +0000[diff] [blame]374<li>The llc "<tt>-filetype=asm</tt>" (the default) is the only supported
Chris Lattner000c73b2008-02-06 06:30:34 +0000[diff] [blame]375 value for this option.</li>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]376</ul>
377
378</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]379
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]380<!-- ======================================================================= -->
381<div class="doc_subsection">
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]382 <a name="x86-be">Known problems with the X86 back-end</a>
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]383</div>
384
385<div class="doc_text">
386
387<ul>
Anton Korobeynikova6094be2008-06-08 10:24:13 +0000[diff] [blame]388 <li>The X86 backend does not yet support
389 all <a href="http://llvm.org/PR879">inline assembly that uses the X86
390 floating point stack</a>. It supports the 'f' and 't' constraints, but not
391 'u'.</li>
Chris Lattnere6e1b352008-06-08 21:19:07 +0000[diff] [blame]392 <li>The X86 backend generates inefficient floating point code when configured
393 to generate code for systems that don't have SSE2.</li>
Duncan Sands47eff2b2008-06-08 19:38:43 +0000[diff] [blame]394 <li>Win64 code generation wasn't widely tested. Everything should work, but we
Anton Korobeynikova6094be2008-06-08 10:24:13 +0000[diff] [blame]395 expect small issues to happen. Also, llvm-gcc cannot build mingw64 runtime
396 currently due
397 to <a href="http://llvm.org/PR2255">several</a>
Chris Lattner04af7cb2008-06-08 23:12:47 +0000[diff] [blame]398 <a href="http://llvm.org/PR2257">bugs</a> due to lack of support for the
399 'u' inline assembly constraint and X87 floating point inline assembly.</li>
Dan Gohman8207ba92008-06-08 23:05:11 +0000[diff] [blame]400 <li>The X86-64 backend does not yet support the LLVM IR instruction
401 <tt>va_arg</tt>. Currently, the llvm-gcc front-end supports variadic
402 argument constructs on X86-64 by lowering them manually.</li>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]403</ul>
404
405</div>
406
407<!-- ======================================================================= -->
408<div class="doc_subsection">
409 <a name="ppc-be">Known problems with the PowerPC back-end</a>
410</div>
411
412<div class="doc_text">
413
414<ul>
Nicolas Geoffraye4285dc2007-05-15 09:21:28 +0000[diff] [blame]415<li>The Linux PPC32/ABI support needs testing for the interpreter and static
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]416compilation, and lacks support for debug information.</li>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]417</ul>
418
419</div>
420
421<!-- ======================================================================= -->
422<div class="doc_subsection">
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]423 <a name="arm-be">Known problems with the ARM back-end</a>
424</div>
425
426<div class="doc_text">
427
428<ul>
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]429<li>Thumb mode works only on ARMv6 or higher processors. On sub-ARMv6
Duncan Sandsc90d68b2007-09-26 15:59:54 +0000[diff] [blame]430processors, thumb programs can crash or produce wrong
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]431results (<a href="http://llvm.org/PR1388">PR1388</a>).</li>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]432<li>Compilation for ARM Linux OABI (old ABI) is supported, but not fully tested.
433</li>
Chris Lattnere6e1b352008-06-08 21:19:07 +0000[diff] [blame]434<li>There is a bug in QEMU-ARM (&lt;= 0.9.0) which causes it to incorrectly
435 execute
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]436programs compiled with LLVM. Please use more recent versions of QEMU.</li>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]437</ul>
438
439</div>
440
441<!-- ======================================================================= -->
442<div class="doc_subsection">
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]443 <a name="sparc-be">Known problems with the SPARC back-end</a>
444</div>
445
446<div class="doc_text">
447
448<ul>
449<li>The SPARC backend only supports the 32-bit SPARC ABI (-m32), it does not
450 support the 64-bit SPARC ABI (-m64).</li>
451</ul>
452
453</div>
454
455<!-- ======================================================================= -->
456<div class="doc_subsection">
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]457 <a name="alpha-be">Known problems with the Alpha back-end</a>
458</div>
459
460<div class="doc_text">
461
462<ul>
463
464<li>On 21164s, some rare FP arithmetic sequences which may trap do not have the
465appropriate nops inserted to ensure restartability.</li>
466
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]467</ul>
468</div>
469
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]470<!-- ======================================================================= -->
471<div class="doc_subsection">
472 <a name="ia64-be">Known problems with the IA64 back-end</a>
473</div>
474
475<div class="doc_text">
476
477<ul>
Chris Lattner04af7cb2008-06-08 23:12:47 +0000[diff] [blame]478<li>The Itanium backend is highly experimental, and has a number of known
479 issues. We are looking for a maintainer for the Itanium backend. If you
480 are interested, please contact the llvmdev mailing list.</li>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]481</ul>
482
483</div>
484
485<!-- ======================================================================= -->
486<div class="doc_subsection">
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]487 <a name="c-be">Known problems with the C back-end</a>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]488</div>
489
490<div class="doc_text">
491
492<ul>
Chris Lattner5733b272008-06-05 06:35:40 +0000[diff] [blame]493<li><a href="http://llvm.org/PR802">The C backend has only basic support for
494 inline assembly code</a>.</li>
Chris Lattner725a0d82007-09-26 06:01:35 +0000[diff] [blame]495<li><a href="http://llvm.org/PR1658">The C backend violates the ABI of common
496 C++ programs</a>, preventing intermixing between C++ compiled by the CBE and
Duncan Sands27aff872008-06-08 20:18:35 +0000[diff] [blame]497 C++ code compiled with llc or native compilers.</li>
Duncan Sandsf74c0cc2008-02-10 13:40:55 +0000[diff] [blame]498<li>The C backend does not support all exception handling constructs.</li>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]499</ul>
500
501</div>
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]502
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]503
504<!-- ======================================================================= -->
505<div class="doc_subsection">
Chris Lattner5733b272008-06-05 06:35:40 +0000[diff] [blame]506 <a name="c-fe">Known problems with the llvm-gcc C front-end</a>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]507</div>
Chris Lattner47588f92003-10-02 05:07:23 +0000[diff] [blame]508
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]509<div class="doc_text">
Chris Lattnerc5d658a2006-03-03 00:34:26 +0000[diff] [blame]510
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]511<p>llvm-gcc does not currently support <a href="http://llvm.org/PR869">Link-Time
512Optimization</a> on most platforms "out-of-the-box". Please inquire on the
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]513llvmdev mailing list if you are interested.</p>
Chris Lattnerd9ea0172006-08-08 17:27:28 +0000[diff] [blame]514
Chris Lattner5733b272008-06-05 06:35:40 +0000[diff] [blame]515<p>The only major language feature of GCC not supported by llvm-gcc is
516 the <tt>__builtin_apply</tt> family of builtins. However, some extensions
517 are only supported on some targets. For example, trampolines are only
Duncan Sands27aff872008-06-08 20:18:35 +0000[diff] [blame]518 supported on some targets (these are used when you take the address of a
519 nested function).</p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]520
Chris Lattner5733b272008-06-05 06:35:40 +0000[diff] [blame]521<p>If you run into GCC extensions which are not supported, please let us know.
522</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]523
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]524</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]525
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]526<!-- ======================================================================= -->
527<div class="doc_subsection">
Chris Lattner5733b272008-06-05 06:35:40 +0000[diff] [blame]528 <a name="c++-fe">Known problems with the llvm-gcc C++ front-end</a>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]529</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]530
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]531<div class="doc_text">
532
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]533<p>The C++ front-end is considered to be fully
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame]534tested and works for a number of non-trivial programs, including LLVM
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]535itself, Qt, Mozilla, etc.</p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]536
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]537<ul>
Anton Korobeynikov0021fc12008-10-11 18:27:16 +0000[diff] [blame]538<li>Exception handling works well on the X86 and PowerPC targets. Currently
539 only linux and darwin targets are supported (both 32 and 64 bit).</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]540</ul>
Chris Lattnerfcc54b32003-10-07 22:14:37 +0000[diff] [blame]541
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]542</div>
543
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]544
Chris Lattner2b659ef2008-02-12 06:29:45 +0000[diff] [blame]545<!-- ======================================================================= -->
546<div class="doc_subsection">
Chris Lattner5733b272008-06-05 06:35:40 +0000[diff] [blame]547 <a name="ada-fe">Known problems with the llvm-gcc Ada front-end</a>
Chris Lattner2b659ef2008-02-12 06:29:45 +0000[diff] [blame]548</div>
549
550<div class="doc_text">
551The llvm-gcc 4.2 Ada compiler works fairly well, however this is not a mature
552technology and problems should be expected.
553<ul>
Duncan Sands27aff872008-06-08 20:18:35 +0000[diff] [blame]554<li>The Ada front-end currently only builds on X86-32. This is mainly due
Chris Lattner2b659ef2008-02-12 06:29:45 +0000[diff] [blame]555to lack of trampoline support (pointers to nested functions) on other platforms,
Duncan Sands27aff872008-06-08 20:18:35 +0000[diff] [blame]556however it <a href="http://llvm.org/PR2006">also fails to build on X86-64</a>
Chris Lattner2b659ef2008-02-12 06:29:45 +0000[diff] [blame]557which does support trampolines.</li>
558<li>The Ada front-end <a href="http://llvm.org/PR2007">fails to bootstrap</a>.
559Workaround: configure with --disable-bootstrap.</li>
560<li>The c380004 and <a href="http://llvm.org/PR2010">c393010</a> ACATS tests
Duncan Sands27aff872008-06-08 20:18:35 +0000[diff] [blame]561fail (c380004 also fails with gcc-4.2 mainline). When built at -O3, the
562<a href="http://llvm.org/PR2421">cxg2021</a> ACATS test also fails.</li>
563<li>Some gcc specific Ada tests continue to crash the compiler. The testsuite
564reports most tests as having failed even though they pass.</li>
Chris Lattner2b659ef2008-02-12 06:29:45 +0000[diff] [blame]565<li>The -E binder option (exception backtraces)
566<a href="http://llvm.org/PR1982">does not work</a> and will result in programs
567crashing if an exception is raised. Workaround: do not use -E.</li>
568<li>Only discrete types <a href="http://llvm.org/PR1981">are allowed to start
569or finish at a non-byte offset</a> in a record. Workaround: do not pack records
570or use representation clauses that result in a field of a non-discrete type
571starting or finishing in the middle of a byte.</li>
Chris Lattnere6e1b352008-06-08 21:19:07 +0000[diff] [blame]572<li>The <tt>lli</tt> interpreter <a href="http://llvm.org/PR2009">considers
573'main' as generated by the Ada binder to be invalid</a>.
574Workaround: hand edit the file to use pointers for <tt>argv</tt> and
575<tt>envp</tt> rather than integers.</li>
576<li>The <tt>-fstack-check</tt> option <a href="http://llvm.org/PR2008">is
577ignored</a>.</li>
Chris Lattner2b659ef2008-02-12 06:29:45 +0000[diff] [blame]578</ul>
579</div>
580
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]581<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]582<div class="doc_section">
583 <a name="additionalinfo">Additional Information</a>
584</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]585<!-- *********************************************************************** -->
586
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]587<div class="doc_text">
588
Chris Lattner416db102005-05-16 17:13:10 +0000[diff] [blame]589<p>A wide variety of additional information is available on the <a
Chris Lattnerb4b0ce72007-05-18 00:44:29 +0000[diff] [blame]590href="http://llvm.org">LLVM web page</a>, in particular in the <a
591href="http://llvm.org/docs/">documentation</a> section. The web page also
Reid Spencer669ed452007-07-09 08:04:31 +0000[diff] [blame]592contains versions of the API documentation which is up-to-date with the
593Subversion version of the source code.
Misha Brukman109d9e82005-03-30 19:14:24 +0000[diff] [blame]594You can access versions of these documents specific to this release by going
595into the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]596
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]597<p>If you have any questions or comments about LLVM, please feel free to contact
Chris Lattnerc463b272005-10-29 07:07:09 +0000[diff] [blame]598us via the <a href="http://llvm.org/docs/#maillist"> mailing
Chris Lattner5eccca42003-12-12 21:22:16 +0000[diff] [blame]599lists</a>.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]600
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]601</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]602
603<!-- *********************************************************************** -->
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]604
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]605<hr>
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]606<address>
Misha Brukman38847d52003-12-21 22:53:21 +0000[diff] [blame]607 <a href="http://jigsaw.w3.org/css-validator/check/referer"><img
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]608 src="http://jigsaw.w3.org/css-validator/images/vcss" alt="Valid CSS!"></a>
609 <a href="http://validator.w3.org/check/referer"><img
Chris Lattner8170c102008-02-10 08:18:42 +0000[diff] [blame]610 src="http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01!"></a>
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]611
Chris Lattnerb4b0ce72007-05-18 00:44:29 +0000[diff] [blame]612 <a href="http://llvm.org/">LLVM Compiler Infrastructure</a><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]613 Last modified: $Date$
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]614</address>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]615
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]616</body>
617</html>