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gerrit-public.fairphone.software / toolchain / llvm-project / 6396952f37cdc7ff953ed34c2a43b9cd57874080 / . / llvm / docs / ReleaseNotes.html
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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>
Daniel Dunbara4a08132008-10-11 21:26:56 +0000[diff] [blame]88
89<li>... Attributes changes ... </li>
90
Chris Lattner63969522008-10-12 18:30:33 +0000[diff] [blame^]91<li>The <tt>DbgStopPointInst</tt> methods <tt>getDirectory</tt> and
92<tt>getFileName</tt> now return <tt>Value*</tt> instead of strings. These can be
93converted to strings using <tt>llvm::GetConstantStringInfo</tt> defined via
94"llvm/Analysis/ValueTracking.h".</li>
Daniel Dunbara4a08132008-10-11 21:26:56 +0000[diff] [blame]95
Chris Lattner63969522008-10-12 18:30:33 +0000[diff] [blame^]96<li>API change: BinaryOperator::create -> Create (CmpInst, CastInst too)</li>
Chris Lattner7795ea92008-06-08 02:45:07 +0000[diff] [blame]97</ul>
Chris Lattnercdc44ed2008-02-06 18:00:06 +0000[diff] [blame]98</div>
99
100<!--=========================================================================-->
101<div class="doc_subsection">
Chris Lattner625a3d82008-06-08 21:34:41 +0000[diff] [blame]102<a name="otherprojects">Other LLVM Sub-Projects</a>
103</div>
104
105<div class="doc_text">
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]106<p>
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]107The core LLVM 2.4 distribution currently consists of code from the core LLVM
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]108repository (which roughly contains the LLVM optimizer, code generators and
109supporting tools) and the llvm-gcc repository. In addition to this code, the
110LLVM Project includes other sub-projects that are in development. The two which
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]111are the most actively developed are the <a href="#clang">Clang Project</a> and
112<a href="#vmkit">vmkit Project</a>.
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]113</p>
114</div>
115
116<!--=========================================================================-->
117<div class="doc_subsubsection">
118<a name="vmkit">vmkit</a>
119</div>
120
121<div class="doc_text">
122<p>
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]123The <a href="http://vmkit.llvm.org/">"vmkit" project</a> is an implementation of
124a JVM and a CLI Virtual Machines (Microsoft .NET is an
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]125implementation of the CLI) using the Just-In-Time compiler of LLVM.</p>
126
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]127<p>...</p>
Chris Lattner625a3d82008-06-08 21:34:41 +0000[diff] [blame]128
129</div>
130
131<!--=========================================================================-->
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]132<div class="doc_subsubsection">
133<a name="clang">Clang</a>
134</div>
135
136<div class="doc_text">
137
138<p>The <a href="http://clang.llvm.org/">Clang project</a> is an effort to build
139a set of new 'LLVM native' front-end technologies for the LLVM optimizer
140and code generator. Clang is continuing to make major strides forward in all
141areas. Its C and Objective-C parsing support is very solid, and the code
142generation support is far enough along to build many C applications. While not
143yet production quality, it is progressing very nicely. In addition, C++
144front-end work has started to make significant progress.</p>
145
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]146<p>Codegen progress/state
147</p>
148
149<p>
150<a href="http://clang.llvm.org/StaticAnalysis.html">static analysis tool</a>
151</p>
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]152
153</div>
154
155
156<!-- *********************************************************************** -->
157<div class="doc_section">
158 <a name="whatsnew">What's New?</a>
159</div>
160<!-- *********************************************************************** -->
161
Chris Lattnerb7bc2aa2008-06-08 22:59:35 +0000[diff] [blame]162<div class="doc_text">
163
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]164<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]165improvements. Some of the major improvements and new features are listed in
166this section.
167</p>
168</div>
169
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]170<!--=========================================================================-->
Chris Lattner625a3d82008-06-08 21:34:41 +0000[diff] [blame]171<div class="doc_subsection">
Chris Lattnercdc44ed2008-02-06 18:00:06 +0000[diff] [blame]172<a name="majorfeatures">Major New Features</a>
173</div>
174
175<div class="doc_text">
176
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]177<p>LLVM 2.4 includes several major new capabilities:</p>
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]178
179<ul>
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]180<li>
Chris Lattner63969522008-10-12 18:30:33 +0000[diff] [blame^]181 <p>MRVs got generalized to FCAs. getresult is gone, ret with multiple values
182 is gone.</p>
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]183 </li>
184
185<li><p>fast isel, -O0 compile times</p></li>
Chris Lattner625a3d82008-06-08 21:34:41 +0000[diff] [blame]186
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]187<li><p>Attrs changes?</p></li>
Chris Lattner618a99f2008-06-05 06:57:39 +0000[diff] [blame]188
Chris Lattner63969522008-10-12 18:30:33 +0000[diff] [blame^]189
190<li><p>Initial PIC16 port</p></li>
191
192<li><p> builtin sync_compare_and_swap builtins + intrinsics</p></li>
193
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]194<li><p>...</p></li>
Chris Lattner618a99f2008-06-05 06:57:39 +0000[diff] [blame]195
Chris Lattner458e79f2008-02-10 08:18:42 +0000[diff] [blame]196</ul>
197
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]198</div>
199
Chris Lattnerb7112222008-06-05 06:25:56 +0000[diff] [blame]200
201<!--=========================================================================-->
202<div class="doc_subsection">
Chris Lattner625a3d82008-06-08 21:34:41 +0000[diff] [blame]203<a name="llvm-gcc">llvm-gcc 4.2 Improvements</a>
Chris Lattnerb7112222008-06-05 06:25:56 +0000[diff] [blame]204</div>
205
206<div class="doc_text">
207
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]208<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]209for the C, C++, Objective-C, Ada, and Fortran front-ends.</p>
Chris Lattnerb7112222008-06-05 06:25:56 +0000[diff] [blame]210
Chris Lattnerb7bc2aa2008-06-08 22:59:35 +0000[diff] [blame]211<p>
212<ul>
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]213<li>...</li>
Chris Lattnerb7bc2aa2008-06-08 22:59:35 +0000[diff] [blame]214
Gabor Greif7f39fb52008-06-09 06:06:18 +0000[diff] [blame]215</ul>
Chris Lattnerb7112222008-06-05 06:25:56 +0000[diff] [blame]216
Chris Lattnerb7112222008-06-05 06:25:56 +0000[diff] [blame]217</div>
218
219
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]220<!--=========================================================================-->
221<div class="doc_subsection">
Chris Lattnerdd6acc02008-02-10 08:17:19 +0000[diff] [blame]222<a name="coreimprovements">LLVM Core Improvements</a>
223</div>
224
225<div class="doc_text">
226<p>New features include:
227</p>
228
Chris Lattnerb7112222008-06-05 06:25:56 +0000[diff] [blame]229<ul>
Chris Lattner63969522008-10-12 18:30:33 +0000[diff] [blame^]230<li>use diet patch landed: saved 15% IR memory footprint</li>
231<li>LLVM IR now directly represents "common" linkage, instead of
232 representing it as a form of weak linkage.</li>
233
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]234<li>...</li>
Chris Lattnerdd6acc02008-02-10 08:17:19 +0000[diff] [blame]235</ul>
236
237</div>
238
239<!--=========================================================================-->
240<div class="doc_subsection">
Chris Lattner2b8a52e2008-02-10 07:46:44 +0000[diff] [blame]241<a name="optimizer">Optimizer Improvements</a>
242</div>
243
244<div class="doc_text">
245
Chris Lattnerdd6acc02008-02-10 08:17:19 +0000[diff] [blame]246<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]247LLVM 2.4 optimizers support a few major enhancements:</p>
Chris Lattner2b8a52e2008-02-10 07:46:44 +0000[diff] [blame]248
249<ul>
250
Chris Lattner63969522008-10-12 18:30:33 +0000[diff] [blame^]251<li>Old-ADCE used control dependence and deleted output-free infinite loops.
252Added a new Loop deletion pass (for deleting output free provably-finite loops)
253and rewrote ADCE to be simpler faster, and not need control dependence.</li>
254
255<li>SparsePropagation framework for lattice-based dataflow solvers.</li>
256
257<li>LoadVN and GCSE finally bit the dust?</li>
258
259<li>Tail duplication was is removed from the standard optimizer sequence.</li>
260
Chris Lattner7795ea92008-06-08 02:45:07 +0000[diff] [blame]261</ul>
262
263</div>
264
265<!--=========================================================================-->
266<div class="doc_subsection">
267<a name="codegen">Code Generator Improvements</a>
268</div>
269
270<div class="doc_text">
271
272<p>We put a significant amount of work into the code generator infrastructure,
273which allows us to implement more aggressive algorithms and make it run
274faster:</p>
275
276<ul>
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]277<li>Selection dag speedups</li>
278<li>...</li>
Chris Lattner7795ea92008-06-08 02:45:07 +0000[diff] [blame]279
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]280</ul>
281
282</div>
283
284
285<!--=========================================================================-->
286<div class="doc_subsection">
Chris Lattner6cb64032008-06-05 08:02:49 +0000[diff] [blame]287<a name="x86specific">X86/X86-64 Specific Improvements</a>
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]288</div>
Chris Lattner727c3742007-05-18 06:33:02 +0000[diff] [blame]289
Chris Lattner89e761c2006-04-18 06:32:08 +0000[diff] [blame]290<div class="doc_text">
Chris Lattnerdd6acc02008-02-10 08:17:19 +0000[diff] [blame]291<p>New target-specific features include:
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]292</p>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]293
294<ul>
Anton Korobeynikov28f08aa2008-10-11 18:27:16 +0000[diff] [blame]295<li>Exception handling is supported by default on x86-64 linux platform.</li>
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]296<li>...</li>
Chris Lattnerb076b002008-06-08 21:19:07 +0000[diff] [blame]297
Chris Lattner8ce1ba42007-05-17 21:41:31 +0000[diff] [blame]298</ul>
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]299
Chris Lattner8ce1ba42007-05-17 21:41:31 +0000[diff] [blame]300</div>
Chris Lattner72a269f2006-03-03 00:34:26 +0000[diff] [blame]301
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]302<!--=========================================================================-->
303<div class="doc_subsection">
Chris Lattner6cb64032008-06-05 08:02:49 +0000[diff] [blame]304<a name="targetspecific">Other Target Specific Improvements</a>
305</div>
306
307<div class="doc_text">
308<p>New target-specific features include:
309</p>
310
311<ul>
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]312<li>....</li>
Chris Lattner6cb64032008-06-05 08:02:49 +0000[diff] [blame]313</ul>
314
315</div>
316
317
318
319<!--=========================================================================-->
320<div class="doc_subsection">
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]321<a name="otherimprovements">Other Improvements</a>
322</div>
323
324<div class="doc_text">
325<p>New features include:
326</p>
327
328<ul>
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]329<li>...</li>
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]330</ul>
331
332</div>
Chris Lattner72a269f2006-03-03 00:34:26 +0000[diff] [blame]333
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]334<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]335<div class="doc_section">
336 <a name="portability">Portability and Supported Platforms</a>
337</div>
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]338<!-- *********************************************************************** -->
339
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]340<div class="doc_text">
341
John Criswell64307722004-12-08 20:35:47 +0000[diff] [blame]342<p>LLVM is known to work on the following platforms:</p>
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]343
344<ul>
Gabor Greif80ae8a72008-06-05 18:39:01 +0000[diff] [blame]345<li>Intel and AMD machines (IA32) running Red Hat Linux, Fedora Core and FreeBSD
Reid Spencer9803b402005-05-17 02:47:27 +0000[diff] [blame]346 (and probably other unix-like systems).</li>
Chris Lattner7422bce2008-02-06 06:30:34 +0000[diff] [blame]347<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]348 64-bit modes.</li>
Chris Lattnercdc44ed2008-02-06 18:00:06 +0000[diff] [blame]349<li>Intel and AMD machines running on Win32 using MinGW libraries (native).</li>
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]350<li>Intel and AMD machines running on Win32 with the Cygwin libraries (limited
351 support is available for native builds with Visual C++).</li>
Gabor Greif80ae8a72008-06-05 18:39:01 +0000[diff] [blame]352<li>Sun UltraSPARC workstations running Solaris 10.</li>
John Criswelld5234922005-05-13 20:28:15 +0000[diff] [blame]353<li>Alpha-based machines running Debian GNU/Linux.</li>
Gabor Greif80ae8a72008-06-05 18:39:01 +0000[diff] [blame]354<li>Itanium-based (IA64) machines running Linux and HP-UX.</li>
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]355</ul>
356
Chris Lattner618a99f2008-06-05 06:57:39 +0000[diff] [blame]357<p>The core LLVM infrastructure uses GNU autoconf to adapt itself
Brian Gaekee3e557e2004-05-09 05:28:35 +0000[diff] [blame]358to the machine and operating system on which it is built. However, minor
359porting may be required to get LLVM to work on new platforms. We welcome your
360portability patches and reports of successful builds or error messages.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]361
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]362</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]363
364<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]365<div class="doc_section">
366 <a name="knownproblems">Known Problems</a>
367</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]368<!-- *********************************************************************** -->
369
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]370<div class="doc_text">
371
372<p>This section contains all known problems with the LLVM system, listed by
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]373component. As new problems are discovered, they will be added to these
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]374sections. If you run into a problem, please check the <a
Chris Lattnera69595e2005-10-29 07:07:09 +0000[diff] [blame]375href="http://llvm.org/bugs/">LLVM bug database</a> and submit a bug if
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]376there isn't already one.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]377
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]378</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]379
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]380<!-- ======================================================================= -->
381<div class="doc_subsection">
382 <a name="experimental">Experimental features included with this release</a>
383</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]384
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]385<div class="doc_text">
386
Misha Brukmanfa50a222004-05-12 21:46:05 +0000[diff] [blame]387<p>The following components of this LLVM release are either untested, known to
388be broken or unreliable, or are in early development. These components should
389not be relied on, and bugs should not be filed against them, but they may be
390useful 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]391components, please contact us on the <a
392href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVMdev list</a>.</p>
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]393
394<ul>
Chris Lattnere38ac152008-02-12 06:29:45 +0000[diff] [blame]395<li>The MSIL, IA64, Alpha, SPU, and MIPS backends are experimental.</li>
Duncan Sands56448462008-06-08 20:18:35 +0000[diff] [blame]396<li>The llc "<tt>-filetype=asm</tt>" (the default) is the only supported
Chris Lattner7422bce2008-02-06 06:30:34 +0000[diff] [blame]397 value for this option.</li>
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]398</ul>
399
400</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]401
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]402<!-- ======================================================================= -->
403<div class="doc_subsection">
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]404 <a name="x86-be">Known problems with the X86 back-end</a>
John Criswell3bdbd302005-11-08 21:11:33 +0000[diff] [blame]405</div>
406
407<div class="doc_text">
408
409<ul>
Anton Korobeynikov486c7d32008-06-08 10:24:13 +0000[diff] [blame]410 <li>The X86 backend does not yet support
411 all <a href="http://llvm.org/PR879">inline assembly that uses the X86
412 floating point stack</a>. It supports the 'f' and 't' constraints, but not
413 'u'.</li>
Chris Lattnerb076b002008-06-08 21:19:07 +0000[diff] [blame]414 <li>The X86 backend generates inefficient floating point code when configured
415 to generate code for systems that don't have SSE2.</li>
Duncan Sands0bc15262008-06-08 19:38:43 +0000[diff] [blame]416 <li>Win64 code generation wasn't widely tested. Everything should work, but we
Anton Korobeynikov486c7d32008-06-08 10:24:13 +0000[diff] [blame]417 expect small issues to happen. Also, llvm-gcc cannot build mingw64 runtime
418 currently due
419 to <a href="http://llvm.org/PR2255">several</a>
Chris Lattner54d12102008-06-08 23:12:47 +0000[diff] [blame]420 <a href="http://llvm.org/PR2257">bugs</a> due to lack of support for the
421 'u' inline assembly constraint and X87 floating point inline assembly.</li>
Dan Gohman721b3722008-06-08 23:05:11 +0000[diff] [blame]422 <li>The X86-64 backend does not yet support the LLVM IR instruction
423 <tt>va_arg</tt>. Currently, the llvm-gcc front-end supports variadic
424 argument constructs on X86-64 by lowering them manually.</li>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]425</ul>
426
427</div>
428
429<!-- ======================================================================= -->
430<div class="doc_subsection">
431 <a name="ppc-be">Known problems with the PowerPC back-end</a>
432</div>
433
434<div class="doc_text">
435
436<ul>
Nicolas Geoffray77d99502007-05-15 09:21:28 +0000[diff] [blame]437<li>The Linux PPC32/ABI support needs testing for the interpreter and static
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]438compilation, and lacks support for debug information.</li>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]439</ul>
440
441</div>
442
443<!-- ======================================================================= -->
444<div class="doc_subsection">
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]445 <a name="arm-be">Known problems with the ARM back-end</a>
446</div>
447
448<div class="doc_text">
449
450<ul>
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]451<li>Thumb mode works only on ARMv6 or higher processors. On sub-ARMv6
Duncan Sands47fc0a22007-09-26 15:59:54 +0000[diff] [blame]452processors, thumb programs can crash or produce wrong
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]453results (<a href="http://llvm.org/PR1388">PR1388</a>).</li>
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]454<li>Compilation for ARM Linux OABI (old ABI) is supported, but not fully tested.
455</li>
Chris Lattnerb076b002008-06-08 21:19:07 +0000[diff] [blame]456<li>There is a bug in QEMU-ARM (&lt;= 0.9.0) which causes it to incorrectly
457 execute
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]458programs compiled with LLVM. Please use more recent versions of QEMU.</li>
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]459</ul>
460
461</div>
462
463<!-- ======================================================================= -->
464<div class="doc_subsection">
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]465 <a name="sparc-be">Known problems with the SPARC back-end</a>
466</div>
467
468<div class="doc_text">
469
470<ul>
471<li>The SPARC backend only supports the 32-bit SPARC ABI (-m32), it does not
472 support the 64-bit SPARC ABI (-m64).</li>
473</ul>
474
475</div>
476
477<!-- ======================================================================= -->
478<div class="doc_subsection">
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]479 <a name="alpha-be">Known problems with the Alpha back-end</a>
480</div>
481
482<div class="doc_text">
483
484<ul>
485
486<li>On 21164s, some rare FP arithmetic sequences which may trap do not have the
487appropriate nops inserted to ensure restartability.</li>
488
John Criswell3bdbd302005-11-08 21:11:33 +0000[diff] [blame]489</ul>
490</div>
491
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]492<!-- ======================================================================= -->
493<div class="doc_subsection">
494 <a name="ia64-be">Known problems with the IA64 back-end</a>
495</div>
496
497<div class="doc_text">
498
499<ul>
Chris Lattner54d12102008-06-08 23:12:47 +0000[diff] [blame]500<li>The Itanium backend is highly experimental, and has a number of known
501 issues. We are looking for a maintainer for the Itanium backend. If you
502 are interested, please contact the llvmdev mailing list.</li>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]503</ul>
504
505</div>
506
507<!-- ======================================================================= -->
508<div class="doc_subsection">
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]509 <a name="c-be">Known problems with the C back-end</a>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]510</div>
511
512<div class="doc_text">
513
514<ul>
Chris Lattnera1a4c9a2008-06-05 06:35:40 +0000[diff] [blame]515<li><a href="http://llvm.org/PR802">The C backend has only basic support for
516 inline assembly code</a>.</li>
Chris Lattner8e061162007-09-26 06:01:35 +0000[diff] [blame]517<li><a href="http://llvm.org/PR1658">The C backend violates the ABI of common
518 C++ programs</a>, preventing intermixing between C++ compiled by the CBE and
Duncan Sands56448462008-06-08 20:18:35 +0000[diff] [blame]519 C++ code compiled with llc or native compilers.</li>
Duncan Sandse09506a2008-02-10 13:40:55 +0000[diff] [blame]520<li>The C backend does not support all exception handling constructs.</li>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]521</ul>
522
523</div>
John Criswell3bdbd302005-11-08 21:11:33 +0000[diff] [blame]524
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]525
526<!-- ======================================================================= -->
527<div class="doc_subsection">
Chris Lattnera1a4c9a2008-06-05 06:35:40 +0000[diff] [blame]528 <a name="c-fe">Known problems with the llvm-gcc C front-end</a>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]529</div>
Chris Lattner178f3db2003-10-02 05:07:23 +0000[diff] [blame]530
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]531<div class="doc_text">
Chris Lattner72a269f2006-03-03 00:34:26 +0000[diff] [blame]532
Chris Lattnercdc44ed2008-02-06 18:00:06 +0000[diff] [blame]533<p>llvm-gcc does not currently support <a href="http://llvm.org/PR869">Link-Time
534Optimization</a> on most platforms "out-of-the-box". Please inquire on the
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]535llvmdev mailing list if you are interested.</p>
Chris Lattner44124232006-08-08 17:27:28 +0000[diff] [blame]536
Chris Lattnera1a4c9a2008-06-05 06:35:40 +0000[diff] [blame]537<p>The only major language feature of GCC not supported by llvm-gcc is
538 the <tt>__builtin_apply</tt> family of builtins. However, some extensions
539 are only supported on some targets. For example, trampolines are only
Duncan Sands56448462008-06-08 20:18:35 +0000[diff] [blame]540 supported on some targets (these are used when you take the address of a
541 nested function).</p>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]542
Chris Lattnera1a4c9a2008-06-05 06:35:40 +0000[diff] [blame]543<p>If you run into GCC extensions which are not supported, please let us know.
544</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]545
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]546</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]547
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]548<!-- ======================================================================= -->
549<div class="doc_subsection">
Chris Lattnera1a4c9a2008-06-05 06:35:40 +0000[diff] [blame]550 <a name="c++-fe">Known problems with the llvm-gcc C++ front-end</a>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]551</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]552
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]553<div class="doc_text">
554
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]555<p>The C++ front-end is considered to be fully
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]556tested and works for a number of non-trivial programs, including LLVM
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]557itself, Qt, Mozilla, etc.</p>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]558
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]559<ul>
Anton Korobeynikov28f08aa2008-10-11 18:27:16 +0000[diff] [blame]560<li>Exception handling works well on the X86 and PowerPC targets. Currently
561 only linux and darwin targets are supported (both 32 and 64 bit).</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]562</ul>
Chris Lattner46ecf612003-10-07 22:14:37 +0000[diff] [blame]563
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]564</div>
565
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]566
Chris Lattnere38ac152008-02-12 06:29:45 +0000[diff] [blame]567<!-- ======================================================================= -->
568<div class="doc_subsection">
Chris Lattnera1a4c9a2008-06-05 06:35:40 +0000[diff] [blame]569 <a name="ada-fe">Known problems with the llvm-gcc Ada front-end</a>
Chris Lattnere38ac152008-02-12 06:29:45 +0000[diff] [blame]570</div>
571
572<div class="doc_text">
573The llvm-gcc 4.2 Ada compiler works fairly well, however this is not a mature
574technology and problems should be expected.
575<ul>
Duncan Sands56448462008-06-08 20:18:35 +0000[diff] [blame]576<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]577to lack of trampoline support (pointers to nested functions) on other platforms,
Duncan Sands56448462008-06-08 20:18:35 +0000[diff] [blame]578however 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]579which does support trampolines.</li>
580<li>The Ada front-end <a href="http://llvm.org/PR2007">fails to bootstrap</a>.
581Workaround: configure with --disable-bootstrap.</li>
582<li>The c380004 and <a href="http://llvm.org/PR2010">c393010</a> ACATS tests
Duncan Sands56448462008-06-08 20:18:35 +0000[diff] [blame]583fail (c380004 also fails with gcc-4.2 mainline). When built at -O3, the
584<a href="http://llvm.org/PR2421">cxg2021</a> ACATS test also fails.</li>
585<li>Some gcc specific Ada tests continue to crash the compiler. The testsuite
586reports most tests as having failed even though they pass.</li>
Chris Lattnere38ac152008-02-12 06:29:45 +0000[diff] [blame]587<li>The -E binder option (exception backtraces)
588<a href="http://llvm.org/PR1982">does not work</a> and will result in programs
589crashing if an exception is raised. Workaround: do not use -E.</li>
590<li>Only discrete types <a href="http://llvm.org/PR1981">are allowed to start
591or finish at a non-byte offset</a> in a record. Workaround: do not pack records
592or use representation clauses that result in a field of a non-discrete type
593starting or finishing in the middle of a byte.</li>
Chris Lattnerb076b002008-06-08 21:19:07 +0000[diff] [blame]594<li>The <tt>lli</tt> interpreter <a href="http://llvm.org/PR2009">considers
595'main' as generated by the Ada binder to be invalid</a>.
596Workaround: hand edit the file to use pointers for <tt>argv</tt> and
597<tt>envp</tt> rather than integers.</li>
598<li>The <tt>-fstack-check</tt> option <a href="http://llvm.org/PR2008">is
599ignored</a>.</li>
Chris Lattnere38ac152008-02-12 06:29:45 +0000[diff] [blame]600</ul>
601</div>
602
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]603<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]604<div class="doc_section">
605 <a name="additionalinfo">Additional Information</a>
606</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]607<!-- *********************************************************************** -->
608
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]609<div class="doc_text">
610
Chris Lattnercb5596d2005-05-16 17:13:10 +0000[diff] [blame]611<p>A wide variety of additional information is available on the <a
Chris Lattnere0c1df42007-05-18 00:44:29 +0000[diff] [blame]612href="http://llvm.org">LLVM web page</a>, in particular in the <a
613href="http://llvm.org/docs/">documentation</a> section. The web page also
Reid Spencerc7f87f22007-07-09 08:04:31 +0000[diff] [blame]614contains versions of the API documentation which is up-to-date with the
615Subversion version of the source code.
Misha Brukman96158092005-03-30 19:14:24 +0000[diff] [blame]616You can access versions of these documents specific to this release by going
617into the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]618
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]619<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]620us via the <a href="http://llvm.org/docs/#maillist"> mailing
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]621lists</a>.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]622
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]623</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]624
625<!-- *********************************************************************** -->
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]626
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]627<hr>
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]628<address>
Misha Brukman8834af92003-12-21 22:53:21 +0000[diff] [blame]629 <a href="http://jigsaw.w3.org/css-validator/check/referer"><img
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]630 src="http://jigsaw.w3.org/css-validator/images/vcss" alt="Valid CSS!"></a>
631 <a href="http://validator.w3.org/check/referer"><img
Chris Lattner458e79f2008-02-10 08:18:42 +0000[diff] [blame]632 src="http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01!"></a>
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]633
Chris Lattnere0c1df42007-05-18 00:44:29 +0000[diff] [blame]634 <a href="http://llvm.org/">LLVM Compiler Infrastructure</a><br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]635 Last modified: $Date$
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]636</address>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]637
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]638</body>
639</html>