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gerrit-public.fairphone.software / toolchain / llvm-project / 3768ad6d58d78502d51281470df80ec6b8168e2a / . / 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
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 Lattner7795ea92008-06-08 02:45:07 +0000[diff] [blame]93</ul>
Chris Lattnercdc44ed2008-02-06 18:00:06 +0000[diff] [blame]94</div>
95
96<!--=========================================================================-->
97<div class="doc_subsection">
Chris Lattner625a3d82008-06-08 21:34:41 +0000[diff] [blame]98<a name="otherprojects">Other LLVM Sub-Projects</a>
99</div>
100
101<div class="doc_text">
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]102<p>
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]103The core LLVM 2.4 distribution currently consists of code from the core LLVM
Chris Lattnerc75fd522008-06-08 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 Lattnerd8b33e02008-10-11 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 Lattnerc75fd522008-06-08 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 Lattnerd8b33e02008-10-11 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 Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]121implementation of the CLI) using the Just-In-Time compiler of LLVM.</p>
122
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]123<p>...</p>
Chris Lattner625a3d82008-06-08 21:34:41 +0000[diff] [blame]124
125</div>
126
127<!--=========================================================================-->
Chris Lattnerc75fd522008-06-08 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 Lattnerd8b33e02008-10-11 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 Lattnerc75fd522008-06-08 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 Lattnerb7bc2aa2008-06-08 22:59:35 +0000[diff] [blame]158<div class="doc_text">
159
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]160<p>LLVM 2.4 includes a huge number of bug fixes, performance tweaks and minor
Chris Lattnerb7bc2aa2008-06-08 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 Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]166<!--=========================================================================-->
Chris Lattner625a3d82008-06-08 21:34:41 +0000[diff] [blame]167<div class="doc_subsection">
Chris Lattnercdc44ed2008-02-06 18:00:06 +0000[diff] [blame]168<a name="majorfeatures">Major New Features</a>
169</div>
170
171<div class="doc_text">
172
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]173<p>LLVM 2.4 includes several major new capabilities:</p>
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]174
175<ul>
Chris Lattnerd8b33e02008-10-11 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 Lattner625a3d82008-06-08 21:34:41 +0000[diff] [blame]181
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]182<li><p>Attrs changes?</p></li>
Chris Lattner618a99f2008-06-05 06:57:39 +0000[diff] [blame]183
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]184<li><p>...</p></li>
Chris Lattner618a99f2008-06-05 06:57:39 +0000[diff] [blame]185
Chris Lattner458e79f2008-02-10 08:18:42 +0000[diff] [blame]186</ul>
187
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]188</div>
189
Chris Lattnerb7112222008-06-05 06:25:56 +0000[diff] [blame]190
191<!--=========================================================================-->
192<div class="doc_subsection">
Chris Lattner625a3d82008-06-08 21:34:41 +0000[diff] [blame]193<a name="llvm-gcc">llvm-gcc 4.2 Improvements</a>
Chris Lattnerb7112222008-06-05 06:25:56 +0000[diff] [blame]194</div>
195
196<div class="doc_text">
197
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]198<p>LLVM 2.4 fully supports the llvm-gcc 4.2 front-end, and includes support
Chris Lattnerb7bc2aa2008-06-08 22:59:35 +0000[diff] [blame]199for the C, C++, Objective-C, Ada, and Fortran front-ends.</p>
Chris Lattnerb7112222008-06-05 06:25:56 +0000[diff] [blame]200
Chris Lattnerb7bc2aa2008-06-08 22:59:35 +0000[diff] [blame]201<p>
202<ul>
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]203<li>...</li>
Chris Lattnerb7bc2aa2008-06-08 22:59:35 +0000[diff] [blame]204
Gabor Greif7f39fb52008-06-09 06:06:18 +0000[diff] [blame]205</ul>
Chris Lattnerb7112222008-06-05 06:25:56 +0000[diff] [blame]206
Chris Lattnerb7112222008-06-05 06:25:56 +0000[diff] [blame]207</div>
208
209
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]210<!--=========================================================================-->
211<div class="doc_subsection">
Chris Lattnerdd6acc02008-02-10 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 Lattnerb7112222008-06-05 06:25:56 +0000[diff] [blame]219<ul>
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]220<li>...</li>
Chris Lattnerdd6acc02008-02-10 08:17:19 +0000[diff] [blame]221</ul>
222
223</div>
224
225<!--=========================================================================-->
226<div class="doc_subsection">
Chris Lattner2b8a52e2008-02-10 07:46:44 +0000[diff] [blame]227<a name="optimizer">Optimizer Improvements</a>
228</div>
229
230<div class="doc_text">
231
Chris Lattnerdd6acc02008-02-10 08:17:19 +0000[diff] [blame]232<p>In addition to a huge array of bug fixes and minor performance tweaks, the
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]233LLVM 2.4 optimizers support a few major enhancements:</p>
Chris Lattner2b8a52e2008-02-10 07:46:44 +0000[diff] [blame]234
235<ul>
236
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]237<li>.</li>
Chris Lattnerb7bc2aa2008-06-08 22:59:35 +0000[diff] [blame]238
Chris Lattner7795ea92008-06-08 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 Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]255<li>Selection dag speedups</li>
256<li>...</li>
Chris Lattner7795ea92008-06-08 02:45:07 +0000[diff] [blame]257
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]258</ul>
259
260</div>
261
262
263<!--=========================================================================-->
264<div class="doc_subsection">
Chris Lattner6cb64032008-06-05 08:02:49 +0000[diff] [blame]265<a name="x86specific">X86/X86-64 Specific Improvements</a>
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]266</div>
Chris Lattner727c3742007-05-18 06:33:02 +0000[diff] [blame]267
Chris Lattner89e761c2006-04-18 06:32:08 +0000[diff] [blame]268<div class="doc_text">
Chris Lattnerdd6acc02008-02-10 08:17:19 +0000[diff] [blame]269<p>New target-specific features include:
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]270</p>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]271
272<ul>
Anton Korobeynikov28f08aa2008-10-11 18:27:16 +0000[diff] [blame]273<li>Exception handling is supported by default on x86-64 linux platform.</li>
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]274<li>...</li>
Chris Lattnerb076b002008-06-08 21:19:07 +0000[diff] [blame]275
Chris Lattner8ce1ba42007-05-17 21:41:31 +0000[diff] [blame]276</ul>
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]277
Chris Lattner8ce1ba42007-05-17 21:41:31 +0000[diff] [blame]278</div>
Chris Lattner72a269f2006-03-03 00:34:26 +0000[diff] [blame]279
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]280<!--=========================================================================-->
281<div class="doc_subsection">
Chris Lattner6cb64032008-06-05 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 Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]290<li>....</li>
Chris Lattner6cb64032008-06-05 08:02:49 +0000[diff] [blame]291</ul>
292
293</div>
294
295
296
297<!--=========================================================================-->
298<div class="doc_subsection">
Chris Lattner0a1fd102007-09-21 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 Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]307<li>...</li>
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]308</ul>
309
310</div>
Chris Lattner72a269f2006-03-03 00:34:26 +0000[diff] [blame]311
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]312<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]313<div class="doc_section">
314 <a name="portability">Portability and Supported Platforms</a>
315</div>
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]316<!-- *********************************************************************** -->
317
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]318<div class="doc_text">
319
John Criswell64307722004-12-08 20:35:47 +0000[diff] [blame]320<p>LLVM is known to work on the following platforms:</p>
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]321
322<ul>
Gabor Greif80ae8a72008-06-05 18:39:01 +0000[diff] [blame]323<li>Intel and AMD machines (IA32) running Red Hat Linux, Fedora Core and FreeBSD
Reid Spencer9803b402005-05-17 02:47:27 +0000[diff] [blame]324 (and probably other unix-like systems).</li>
Chris Lattner7422bce2008-02-06 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 Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]326 64-bit modes.</li>
Chris Lattnercdc44ed2008-02-06 18:00:06 +0000[diff] [blame]327<li>Intel and AMD machines running on Win32 using MinGW libraries (native).</li>
Chris Lattnerbee7b322007-05-23 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 Greif80ae8a72008-06-05 18:39:01 +0000[diff] [blame]330<li>Sun UltraSPARC workstations running Solaris 10.</li>
John Criswelld5234922005-05-13 20:28:15 +0000[diff] [blame]331<li>Alpha-based machines running Debian GNU/Linux.</li>
Gabor Greif80ae8a72008-06-05 18:39:01 +0000[diff] [blame]332<li>Itanium-based (IA64) machines running Linux and HP-UX.</li>
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]333</ul>
334
Chris Lattner618a99f2008-06-05 06:57:39 +0000[diff] [blame]335<p>The core LLVM infrastructure uses GNU autoconf to adapt itself
Brian Gaekee3e557e2004-05-09 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 Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]339
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]340</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]341
342<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]343<div class="doc_section">
344 <a name="knownproblems">Known Problems</a>
345</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]346<!-- *********************************************************************** -->
347
Misha Brukman80731b92003-11-22 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 Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]351component. As new problems are discovered, they will be added to these
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]352sections. If you run into a problem, please check the <a
Chris Lattnera69595e2005-10-29 07:07:09 +0000[diff] [blame]353href="http://llvm.org/bugs/">LLVM bug database</a> and submit a bug if
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]354there isn't already one.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]355
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]356</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]357
Chris Lattnerb911de42004-03-14 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 Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]362
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]363<div class="doc_text">
364
Misha Brukmanfa50a222004-05-12 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 Lattnere38ac152008-02-12 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 Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]371
372<ul>
Chris Lattnere38ac152008-02-12 06:29:45 +0000[diff] [blame]373<li>The MSIL, IA64, Alpha, SPU, and MIPS backends are experimental.</li>
Duncan Sands56448462008-06-08 20:18:35 +0000[diff] [blame]374<li>The llc "<tt>-filetype=asm</tt>" (the default) is the only supported
Chris Lattner7422bce2008-02-06 06:30:34 +0000[diff] [blame]375 value for this option.</li>
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]376</ul>
377
378</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]379
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]380<!-- ======================================================================= -->
381<div class="doc_subsection">
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]382 <a name="x86-be">Known problems with the X86 back-end</a>
John Criswell3bdbd302005-11-08 21:11:33 +0000[diff] [blame]383</div>
384
385<div class="doc_text">
386
387<ul>
Anton Korobeynikov486c7d32008-06-08 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 Lattnerb076b002008-06-08 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 Sands0bc15262008-06-08 19:38:43 +0000[diff] [blame]394 <li>Win64 code generation wasn't widely tested. Everything should work, but we
Anton Korobeynikov486c7d32008-06-08 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 Lattner54d12102008-06-08 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 Gohman721b3722008-06-08 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 Lattnerb81f10e2006-11-18 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 Geoffray77d99502007-05-15 09:21:28 +0000[diff] [blame]415<li>The Linux PPC32/ABI support needs testing for the interpreter and static
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]416compilation, and lacks support for debug information.</li>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]417</ul>
418
419</div>
420
421<!-- ======================================================================= -->
422<div class="doc_subsection">
Chris Lattner97beb512007-05-14 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 Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]429<li>Thumb mode works only on ARMv6 or higher processors. On sub-ARMv6
Duncan Sands47fc0a22007-09-26 15:59:54 +0000[diff] [blame]430processors, thumb programs can crash or produce wrong
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]431results (<a href="http://llvm.org/PR1388">PR1388</a>).</li>
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]432<li>Compilation for ARM Linux OABI (old ABI) is supported, but not fully tested.
433</li>
Chris Lattnerb076b002008-06-08 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 Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]436programs compiled with LLVM. Please use more recent versions of QEMU.</li>
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]437</ul>
438
439</div>
440
441<!-- ======================================================================= -->
442<div class="doc_subsection">
Chris Lattnerb81f10e2006-11-18 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 Lattnerb81f10e2006-11-18 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 Criswell3bdbd302005-11-08 21:11:33 +0000[diff] [blame]467</ul>
468</div>
469
Chris Lattnerb81f10e2006-11-18 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 Lattner54d12102008-06-08 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 Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]481</ul>
482
483</div>
484
485<!-- ======================================================================= -->
486<div class="doc_subsection">
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]487 <a name="c-be">Known problems with the C back-end</a>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]488</div>
489
490<div class="doc_text">
491
492<ul>
Chris Lattnera1a4c9a2008-06-05 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 Lattner8e061162007-09-26 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 Sands56448462008-06-08 20:18:35 +0000[diff] [blame]497 C++ code compiled with llc or native compilers.</li>
Duncan Sandse09506a2008-02-10 13:40:55 +0000[diff] [blame]498<li>The C backend does not support all exception handling constructs.</li>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]499</ul>
500
501</div>
John Criswell3bdbd302005-11-08 21:11:33 +0000[diff] [blame]502
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]503
504<!-- ======================================================================= -->
505<div class="doc_subsection">
Chris Lattnera1a4c9a2008-06-05 06:35:40 +0000[diff] [blame]506 <a name="c-fe">Known problems with the llvm-gcc C front-end</a>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]507</div>
Chris Lattner178f3db2003-10-02 05:07:23 +0000[diff] [blame]508
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]509<div class="doc_text">
Chris Lattner72a269f2006-03-03 00:34:26 +0000[diff] [blame]510
Chris Lattnercdc44ed2008-02-06 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 Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]513llvmdev mailing list if you are interested.</p>
Chris Lattner44124232006-08-08 17:27:28 +0000[diff] [blame]514
Chris Lattnera1a4c9a2008-06-05 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 Sands56448462008-06-08 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 Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]520
Chris Lattnera1a4c9a2008-06-05 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 Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]523
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]524</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]525
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]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 Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]530
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]531<div class="doc_text">
532
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]533<p>The C++ front-end is considered to be fully
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]534tested and works for a number of non-trivial programs, including LLVM
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]535itself, Qt, Mozilla, etc.</p>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]536
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]537<ul>
Anton Korobeynikov28f08aa2008-10-11 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 Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]540</ul>
Chris Lattner46ecf612003-10-07 22:14:37 +0000[diff] [blame]541
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]542</div>
543
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]544
Chris Lattnere38ac152008-02-12 06:29:45 +0000[diff] [blame]545<!-- ======================================================================= -->
546<div class="doc_subsection">
Chris Lattnera1a4c9a2008-06-05 06:35:40 +0000[diff] [blame]547 <a name="ada-fe">Known problems with the llvm-gcc Ada front-end</a>
Chris Lattnere38ac152008-02-12 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 Sands56448462008-06-08 20:18:35 +0000[diff] [blame]554<li>The Ada front-end currently only builds on X86-32. This is mainly due
Chris Lattnere38ac152008-02-12 06:29:45 +0000[diff] [blame]555to lack of trampoline support (pointers to nested functions) on other platforms,
Duncan Sands56448462008-06-08 20:18:35 +0000[diff] [blame]556however it <a href="http://llvm.org/PR2006">also fails to build on X86-64</a>
Chris Lattnere38ac152008-02-12 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 Sands56448462008-06-08 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 Lattnere38ac152008-02-12 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 Lattnerb076b002008-06-08 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 Lattnere38ac152008-02-12 06:29:45 +0000[diff] [blame]578</ul>
579</div>
580
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]581<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]582<div class="doc_section">
583 <a name="additionalinfo">Additional Information</a>
584</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]585<!-- *********************************************************************** -->
586
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]587<div class="doc_text">
588
Chris Lattnercb5596d2005-05-16 17:13:10 +0000[diff] [blame]589<p>A wide variety of additional information is available on the <a
Chris Lattnere0c1df42007-05-18 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 Spencerc7f87f22007-07-09 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 Brukman96158092005-03-30 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 Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]596
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]597<p>If you have any questions or comments about LLVM, please feel free to contact
Chris Lattnera69595e2005-10-29 07:07:09 +0000[diff] [blame]598us via the <a href="http://llvm.org/docs/#maillist"> mailing
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]599lists</a>.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]600
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]601</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]602
603<!-- *********************************************************************** -->
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]604
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]605<hr>
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]606<address>
Misha Brukman8834af92003-12-21 22:53:21 +0000[diff] [blame]607 <a href="http://jigsaw.w3.org/css-validator/check/referer"><img
Misha Brukman68aab3b2003-11-22 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 Lattner458e79f2008-02-10 08:18:42 +0000[diff] [blame]610 src="http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01!"></a>
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]611
Chris Lattnere0c1df42007-05-18 00:44:29 +0000[diff] [blame]612 <a href="http://llvm.org/">LLVM Compiler Infrastructure</a><br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]613 Last modified: $Date$
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]614</address>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]615
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]616</body>
617</html>