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Chris Lattner2c3ef982008-10-11 18:18:28 +0000[diff] [blame]7 <title>LLVM 2.4 Release Notes</title>
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]8</head>
9<body>
10
Chris Lattner2c3ef982008-10-11 18:18:28 +0000[diff] [blame]11<div class="doc_title">LLVM 2.4 Release Notes</div>
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]12
13<ol>
14 <li><a href="#intro">Introduction</a></li>
Chris Lattnerf6a0d382008-06-08 21:58:17 +0000[diff] [blame]15 <li><a href="#changes">Major Changes and Sub-project Status</a></li>
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]16 <li><a href="#whatsnew">What's New?</a></li>
17 <li><a href="GettingStarted.html">Installation Instructions</a></li>
18 <li><a href="#portability">Portability and Supported Platforms</a></li>
19 <li><a href="#knownproblems">Known Problems</a>
20 <li><a href="#additionalinfo">Additional Information</a></li>
21</ol>
22
23<div class="doc_author">
24 <p>Written by the <a href="http://llvm.org">LLVM Team</a><p>
25</div>
26
Chris Lattnere45f18b2008-06-05 08:02:49 +0000[diff] [blame]27<!-- Done through Week-of-Mon-20080324.txt -->
28
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]29<!-- *********************************************************************** -->
30<div class="doc_section">
31 <a name="intro">Introduction</a>
32</div>
33<!-- *********************************************************************** -->
34
35<div class="doc_text">
36
37<p>This document contains the release notes for the LLVM compiler
Chris Lattner2c3ef982008-10-11 18:18:28 +0000[diff] [blame]38infrastructure, release 2.4. Here we describe the status of LLVM, including
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]39major improvements from the previous release and any known problems. All LLVM
40releases may be downloaded from the <a href="http://llvm.org/releases/">LLVM
41releases web site</a>.</p>
42
43<p>For more information about LLVM, including information about the latest
44release, please check out the <a href="http://llvm.org/">main LLVM
45web site</a>. If you have questions or comments, the <a
46href="http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVM developer's mailing
47list</a> is a good place to send them.</p>
48
49<p>Note that if you are reading this file from a Subversion checkout or the
Chris Lattnerb0d6c502007-09-21 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>
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]53
54</div>
55
56<!-- *********************************************************************** -->
57<div class="doc_section">
Chris Lattnerf6a0d382008-06-08 21:58:17 +0000[diff] [blame]58 <a name="changes">Major Changes and Sub-project Status</a>
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]59</div>
60<!-- *********************************************************************** -->
61
62<div class="doc_text">
63
Chris Lattner2c3ef982008-10-11 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>
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]66
67</div>
68
Chris Lattner2c3ef982008-10-11 18:18:28 +0000[diff] [blame]69<!-- Unfinished features in 2.4:
Chris Lattner8fda4952008-02-10 07:46:44 +0000[diff] [blame]70 Machine LICM
71 Machine Sinking
72 LegalizeDAGTypes
73 -->
74
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]75<!--=========================================================================-->
76<div class="doc_subsection">
Chris Lattner2c3ef982008-10-11 18:18:28 +0000[diff] [blame]77<a name="changes">Major Changes in LLVM 2.4</a>
Chris Lattner41bf8e92008-02-10 07:04:35 +0000[diff] [blame]78</div>
79
80<div class="doc_text">
81
Chris Lattner2c3ef982008-10-11 18:18:28 +0000[diff] [blame]82<p>....</p>
Chris Lattnerd95b5962008-06-08 21:19:07 +0000[diff] [blame]83
Chris Lattner0eef6e42008-06-08 02:45:07 +0000[diff] [blame]84<p>LLVM API Changes:</p>
Chris Lattnere45f18b2008-06-05 08:02:49 +0000[diff] [blame]85
Chris Lattner0eef6e42008-06-08 02:45:07 +0000[diff] [blame]86<ul>
Chris Lattner2c3ef982008-10-11 18:18:28 +0000[diff] [blame]87<li>....</li>
Chris Lattner0eef6e42008-06-08 02:45:07 +0000[diff] [blame]88</ul>
Chris Lattnere0798082008-02-06 18:00:06 +0000[diff] [blame]89</div>
90
91<!--=========================================================================-->
92<div class="doc_subsection">
Chris Lattnerf65224f2008-06-08 21:34:41 +0000[diff] [blame]93<a name="otherprojects">Other LLVM Sub-Projects</a>
94</div>
95
96<div class="doc_text">
Chris Lattnerf6a0d382008-06-08 21:58:17 +0000[diff] [blame]97<p>
Chris Lattner2c3ef982008-10-11 18:18:28 +0000[diff] [blame]98The core LLVM 2.4 distribution currently consists of code from the core LLVM
Chris Lattnerf6a0d382008-06-08 21:58:17 +0000[diff] [blame]99repository (which roughly contains the LLVM optimizer, code generators and
100supporting tools) and the llvm-gcc repository. In addition to this code, the
101LLVM Project includes other sub-projects that are in development. The two which
Chris Lattner2c3ef982008-10-11 18:18:28 +0000[diff] [blame]102are the most actively developed are the <a href="#clang">Clang Project</a> and
103<a href="#vmkit">vmkit Project</a>.
Chris Lattnerf6a0d382008-06-08 21:58:17 +0000[diff] [blame]104</p>
105</div>
106
107<!--=========================================================================-->
108<div class="doc_subsubsection">
109<a name="vmkit">vmkit</a>
110</div>
111
112<div class="doc_text">
113<p>
Chris Lattner2c3ef982008-10-11 18:18:28 +0000[diff] [blame]114The <a href="http://vmkit.llvm.org/">"vmkit" project</a> is an implementation of
115a JVM and a CLI Virtual Machines (Microsoft .NET is an
Chris Lattnerf6a0d382008-06-08 21:58:17 +0000[diff] [blame]116implementation of the CLI) using the Just-In-Time compiler of LLVM.</p>
117
Chris Lattner2c3ef982008-10-11 18:18:28 +0000[diff] [blame]118<p>...</p>
Chris Lattnerf65224f2008-06-08 21:34:41 +0000[diff] [blame]119
120</div>
121
122<!--=========================================================================-->
Chris Lattnerf6a0d382008-06-08 21:58:17 +0000[diff] [blame]123<div class="doc_subsubsection">
124<a name="clang">Clang</a>
125</div>
126
127<div class="doc_text">
128
129<p>The <a href="http://clang.llvm.org/">Clang project</a> is an effort to build
130a set of new 'LLVM native' front-end technologies for the LLVM optimizer
131and code generator. Clang is continuing to make major strides forward in all
132areas. Its C and Objective-C parsing support is very solid, and the code
133generation support is far enough along to build many C applications. While not
134yet production quality, it is progressing very nicely. In addition, C++
135front-end work has started to make significant progress.</p>
136
Chris Lattner2c3ef982008-10-11 18:18:28 +0000[diff] [blame]137<p>Codegen progress/state
138</p>
139
140<p>
141<a href="http://clang.llvm.org/StaticAnalysis.html">static analysis tool</a>
142</p>
Chris Lattnerf6a0d382008-06-08 21:58:17 +0000[diff] [blame]143
144</div>
145
146
147<!-- *********************************************************************** -->
148<div class="doc_section">
149 <a name="whatsnew">What's New?</a>
150</div>
151<!-- *********************************************************************** -->
152
Chris Lattner5cce7a52008-06-08 22:59:35 +0000[diff] [blame]153<div class="doc_text">
154
Chris Lattner2c3ef982008-10-11 18:18:28 +0000[diff] [blame]155<p>LLVM 2.4 includes a huge number of bug fixes, performance tweaks and minor
Chris Lattner5cce7a52008-06-08 22:59:35 +0000[diff] [blame]156improvements. Some of the major improvements and new features are listed in
157this section.
158</p>
159</div>
160
Chris Lattnerf6a0d382008-06-08 21:58:17 +0000[diff] [blame]161<!--=========================================================================-->
Chris Lattnerf65224f2008-06-08 21:34:41 +0000[diff] [blame]162<div class="doc_subsection">
Chris Lattnere0798082008-02-06 18:00:06 +0000[diff] [blame]163<a name="majorfeatures">Major New Features</a>
164</div>
165
166<div class="doc_text">
167
Chris Lattner2c3ef982008-10-11 18:18:28 +0000[diff] [blame]168<p>LLVM 2.4 includes several major new capabilities:</p>
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]169
170<ul>
Chris Lattner2c3ef982008-10-11 18:18:28 +0000[diff] [blame]171<li>
172 <p>MRVs got generalized to FCAs.</p>
173 </li>
174
175<li><p>fast isel, -O0 compile times</p></li>
Chris Lattnerf65224f2008-06-08 21:34:41 +0000[diff] [blame]176
Chris Lattner2c3ef982008-10-11 18:18:28 +0000[diff] [blame]177<li><p>Attrs changes?</p></li>
Chris Lattnerba948522008-06-05 06:57:39 +0000[diff] [blame]178
Chris Lattner2c3ef982008-10-11 18:18:28 +0000[diff] [blame]179<li><p>...</p></li>
Chris Lattnerba948522008-06-05 06:57:39 +0000[diff] [blame]180
Chris Lattner5ba16862008-02-10 08:18:42 +0000[diff] [blame]181</ul>
182
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]183</div>
184
Chris Lattnerc5a4e312008-06-05 06:25:56 +0000[diff] [blame]185
186<!--=========================================================================-->
187<div class="doc_subsection">
Chris Lattnerf65224f2008-06-08 21:34:41 +0000[diff] [blame]188<a name="llvm-gcc">llvm-gcc 4.2 Improvements</a>
Chris Lattnerc5a4e312008-06-05 06:25:56 +0000[diff] [blame]189</div>
190
191<div class="doc_text">
192
Chris Lattner2c3ef982008-10-11 18:18:28 +0000[diff] [blame]193<p>LLVM 2.4 fully supports the llvm-gcc 4.2 front-end, and includes support
Chris Lattner5cce7a52008-06-08 22:59:35 +0000[diff] [blame]194for the C, C++, Objective-C, Ada, and Fortran front-ends.</p>
Chris Lattnerc5a4e312008-06-05 06:25:56 +0000[diff] [blame]195
Chris Lattner5cce7a52008-06-08 22:59:35 +0000[diff] [blame]196<p>
197<ul>
Chris Lattner2c3ef982008-10-11 18:18:28 +0000[diff] [blame]198<li>...</li>
Chris Lattner5cce7a52008-06-08 22:59:35 +0000[diff] [blame]199
Gabor Greif0e49cc82008-06-09 06:06:18 +0000[diff] [blame]200</ul>
Chris Lattnerc5a4e312008-06-05 06:25:56 +0000[diff] [blame]201
Chris Lattnerc5a4e312008-06-05 06:25:56 +0000[diff] [blame]202</div>
203
204
Chris Lattnerb0d6c502007-09-21 03:54:09 +0000[diff] [blame]205<!--=========================================================================-->
206<div class="doc_subsection">
Chris Lattnerc3649452008-02-10 08:17:19 +0000[diff] [blame]207<a name="coreimprovements">LLVM Core Improvements</a>
208</div>
209
210<div class="doc_text">
211<p>New features include:
212</p>
213
Chris Lattnerc5a4e312008-06-05 06:25:56 +0000[diff] [blame]214<ul>
Chris Lattner2c3ef982008-10-11 18:18:28 +0000[diff] [blame]215<li>...</li>
Chris Lattnerc3649452008-02-10 08:17:19 +0000[diff] [blame]216</ul>
217
218</div>
219
220<!--=========================================================================-->
221<div class="doc_subsection">
Chris Lattner8fda4952008-02-10 07:46:44 +0000[diff] [blame]222<a name="optimizer">Optimizer Improvements</a>
223</div>
224
225<div class="doc_text">
226
Chris Lattnerc3649452008-02-10 08:17:19 +0000[diff] [blame]227<p>In addition to a huge array of bug fixes and minor performance tweaks, the
Chris Lattner2c3ef982008-10-11 18:18:28 +0000[diff] [blame]228LLVM 2.4 optimizers support a few major enhancements:</p>
Chris Lattner8fda4952008-02-10 07:46:44 +0000[diff] [blame]229
230<ul>
231
Chris Lattner2c3ef982008-10-11 18:18:28 +0000[diff] [blame]232<li>.</li>
Chris Lattner5cce7a52008-06-08 22:59:35 +0000[diff] [blame]233
Chris Lattner0eef6e42008-06-08 02:45:07 +0000[diff] [blame]234</ul>
235
236</div>
237
238<!--=========================================================================-->
239<div class="doc_subsection">
240<a name="codegen">Code Generator Improvements</a>
241</div>
242
243<div class="doc_text">
244
245<p>We put a significant amount of work into the code generator infrastructure,
246which allows us to implement more aggressive algorithms and make it run
247faster:</p>
248
249<ul>
Chris Lattner2c3ef982008-10-11 18:18:28 +0000[diff] [blame]250<li>Selection dag speedups</li>
251<li>...</li>
Chris Lattner0eef6e42008-06-08 02:45:07 +0000[diff] [blame]252
Chris Lattnerb0d6c502007-09-21 03:54:09 +0000[diff] [blame]253</ul>
254
255</div>
256
257
258<!--=========================================================================-->
259<div class="doc_subsection">
Chris Lattnere45f18b2008-06-05 08:02:49 +0000[diff] [blame]260<a name="x86specific">X86/X86-64 Specific Improvements</a>
Chris Lattnerb0d6c502007-09-21 03:54:09 +0000[diff] [blame]261</div>
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]262
263<div class="doc_text">
Chris Lattnerc3649452008-02-10 08:17:19 +0000[diff] [blame]264<p>New target-specific features include:
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]265</p>
266
267<ul>
Chris Lattner2c3ef982008-10-11 18:18:28 +0000[diff] [blame]268<li>...</li>
Chris Lattnerd95b5962008-06-08 21:19:07 +0000[diff] [blame]269
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]270</ul>
Chris Lattnerb0d6c502007-09-21 03:54:09 +0000[diff] [blame]271
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]272</div>
273
Chris Lattnerb0d6c502007-09-21 03:54:09 +0000[diff] [blame]274<!--=========================================================================-->
275<div class="doc_subsection">
Chris Lattnere45f18b2008-06-05 08:02:49 +0000[diff] [blame]276<a name="targetspecific">Other Target Specific Improvements</a>
277</div>
278
279<div class="doc_text">
280<p>New target-specific features include:
281</p>
282
283<ul>
Chris Lattner2c3ef982008-10-11 18:18:28 +0000[diff] [blame]284<li>....</li>
Chris Lattnere45f18b2008-06-05 08:02:49 +0000[diff] [blame]285</ul>
286
287</div>
288
289
290
291<!--=========================================================================-->
292<div class="doc_subsection">
Chris Lattnerb0d6c502007-09-21 03:54:09 +0000[diff] [blame]293<a name="otherimprovements">Other Improvements</a>
294</div>
295
296<div class="doc_text">
297<p>New features include:
298</p>
299
300<ul>
Chris Lattner2c3ef982008-10-11 18:18:28 +0000[diff] [blame]301<li>...</li>
Chris Lattnerb0d6c502007-09-21 03:54:09 +0000[diff] [blame]302</ul>
303
304</div>
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]305
306<!-- *********************************************************************** -->
307<div class="doc_section">
308 <a name="portability">Portability and Supported Platforms</a>
309</div>
310<!-- *********************************************************************** -->
311
312<div class="doc_text">
313
314<p>LLVM is known to work on the following platforms:</p>
315
316<ul>
Gabor Greif5e75e652008-06-05 18:39:01 +0000[diff] [blame]317<li>Intel and AMD machines (IA32) running Red Hat Linux, Fedora Core and FreeBSD
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]318 (and probably other unix-like systems).</li>
Chris Lattnerbd633de92008-02-06 06:30:34 +0000[diff] [blame]319<li>PowerPC and X86-based Mac OS X systems, running 10.3 and above in 32-bit and
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]320 64-bit modes.</li>
Chris Lattnere0798082008-02-06 18:00:06 +0000[diff] [blame]321<li>Intel and AMD machines running on Win32 using MinGW libraries (native).</li>
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]322<li>Intel and AMD machines running on Win32 with the Cygwin libraries (limited
323 support is available for native builds with Visual C++).</li>
Gabor Greif5e75e652008-06-05 18:39:01 +0000[diff] [blame]324<li>Sun UltraSPARC workstations running Solaris 10.</li>
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]325<li>Alpha-based machines running Debian GNU/Linux.</li>
Gabor Greif5e75e652008-06-05 18:39:01 +0000[diff] [blame]326<li>Itanium-based (IA64) machines running Linux and HP-UX.</li>
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]327</ul>
328
Chris Lattnerba948522008-06-05 06:57:39 +0000[diff] [blame]329<p>The core LLVM infrastructure uses GNU autoconf to adapt itself
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]330to the machine and operating system on which it is built. However, minor
331porting may be required to get LLVM to work on new platforms. We welcome your
332portability patches and reports of successful builds or error messages.</p>
333
334</div>
335
336<!-- *********************************************************************** -->
337<div class="doc_section">
338 <a name="knownproblems">Known Problems</a>
339</div>
340<!-- *********************************************************************** -->
341
342<div class="doc_text">
343
344<p>This section contains all known problems with the LLVM system, listed by
345component. As new problems are discovered, they will be added to these
346sections. If you run into a problem, please check the <a
347href="http://llvm.org/bugs/">LLVM bug database</a> and submit a bug if
348there isn't already one.</p>
349
350</div>
351
352<!-- ======================================================================= -->
353<div class="doc_subsection">
354 <a name="experimental">Experimental features included with this release</a>
355</div>
356
357<div class="doc_text">
358
359<p>The following components of this LLVM release are either untested, known to
360be broken or unreliable, or are in early development. These components should
361not be relied on, and bugs should not be filed against them, but they may be
362useful to some people. In particular, if you would like to work on one of these
Chris Lattnerdaeb3232008-02-12 06:29:45 +0000[diff] [blame]363components, please contact us on the <a
364href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVMdev list</a>.</p>
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]365
366<ul>
Chris Lattnerdaeb3232008-02-12 06:29:45 +0000[diff] [blame]367<li>The MSIL, IA64, Alpha, SPU, and MIPS backends are experimental.</li>
Duncan Sandsa73561c2008-06-08 20:18:35 +0000[diff] [blame]368<li>The llc "<tt>-filetype=asm</tt>" (the default) is the only supported
Chris Lattnerbd633de92008-02-06 06:30:34 +0000[diff] [blame]369 value for this option.</li>
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]370</ul>
371
372</div>
373
374<!-- ======================================================================= -->
375<div class="doc_subsection">
376 <a name="x86-be">Known problems with the X86 back-end</a>
377</div>
378
379<div class="doc_text">
380
381<ul>
Anton Korobeynikov77d15e22008-06-08 10:24:13 +0000[diff] [blame]382 <li>The X86 backend does not yet support
383 all <a href="http://llvm.org/PR879">inline assembly that uses the X86
384 floating point stack</a>. It supports the 'f' and 't' constraints, but not
385 'u'.</li>
Chris Lattnerd95b5962008-06-08 21:19:07 +0000[diff] [blame]386 <li>The X86 backend generates inefficient floating point code when configured
387 to generate code for systems that don't have SSE2.</li>
Duncan Sands8b4f3772008-06-08 19:38:43 +0000[diff] [blame]388 <li>Win64 code generation wasn't widely tested. Everything should work, but we
Anton Korobeynikov77d15e22008-06-08 10:24:13 +0000[diff] [blame]389 expect small issues to happen. Also, llvm-gcc cannot build mingw64 runtime
390 currently due
391 to <a href="http://llvm.org/PR2255">several</a>
Chris Lattnerf06141a2008-06-08 23:12:47 +0000[diff] [blame]392 <a href="http://llvm.org/PR2257">bugs</a> due to lack of support for the
393 'u' inline assembly constraint and X87 floating point inline assembly.</li>
Dan Gohman3882ecb2008-06-08 23:05:11 +0000[diff] [blame]394 <li>The X86-64 backend does not yet support the LLVM IR instruction
395 <tt>va_arg</tt>. Currently, the llvm-gcc front-end supports variadic
396 argument constructs on X86-64 by lowering them manually.</li>
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]397</ul>
398
399</div>
400
401<!-- ======================================================================= -->
402<div class="doc_subsection">
403 <a name="ppc-be">Known problems with the PowerPC back-end</a>
404</div>
405
406<div class="doc_text">
407
408<ul>
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]409<li>The Linux PPC32/ABI support needs testing for the interpreter and static
410compilation, and lacks support for debug information.</li>
411</ul>
412
413</div>
414
415<!-- ======================================================================= -->
416<div class="doc_subsection">
417 <a name="arm-be">Known problems with the ARM back-end</a>
418</div>
419
420<div class="doc_text">
421
422<ul>
423<li>Thumb mode works only on ARMv6 or higher processors. On sub-ARMv6
Duncan Sands1827fa62007-09-26 15:59:54 +0000[diff] [blame]424processors, thumb programs can crash or produce wrong
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]425results (<a href="http://llvm.org/PR1388">PR1388</a>).</li>
426<li>Compilation for ARM Linux OABI (old ABI) is supported, but not fully tested.
427</li>
Chris Lattnerd95b5962008-06-08 21:19:07 +0000[diff] [blame]428<li>There is a bug in QEMU-ARM (&lt;= 0.9.0) which causes it to incorrectly
429 execute
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]430programs compiled with LLVM. Please use more recent versions of QEMU.</li>
431</ul>
432
433</div>
434
435<!-- ======================================================================= -->
436<div class="doc_subsection">
437 <a name="sparc-be">Known problems with the SPARC back-end</a>
438</div>
439
440<div class="doc_text">
441
442<ul>
443<li>The SPARC backend only supports the 32-bit SPARC ABI (-m32), it does not
444 support the 64-bit SPARC ABI (-m64).</li>
445</ul>
446
447</div>
448
449<!-- ======================================================================= -->
450<div class="doc_subsection">
451 <a name="alpha-be">Known problems with the Alpha back-end</a>
452</div>
453
454<div class="doc_text">
455
456<ul>
457
458<li>On 21164s, some rare FP arithmetic sequences which may trap do not have the
459appropriate nops inserted to ensure restartability.</li>
460
461</ul>
462</div>
463
464<!-- ======================================================================= -->
465<div class="doc_subsection">
466 <a name="ia64-be">Known problems with the IA64 back-end</a>
467</div>
468
469<div class="doc_text">
470
471<ul>
Chris Lattnerf06141a2008-06-08 23:12:47 +0000[diff] [blame]472<li>The Itanium backend is highly experimental, and has a number of known
473 issues. We are looking for a maintainer for the Itanium backend. If you
474 are interested, please contact the llvmdev mailing list.</li>
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]475</ul>
476
477</div>
478
479<!-- ======================================================================= -->
480<div class="doc_subsection">
481 <a name="c-be">Known problems with the C back-end</a>
482</div>
483
484<div class="doc_text">
485
486<ul>
Chris Lattner499c07c2008-06-05 06:35:40 +0000[diff] [blame]487<li><a href="http://llvm.org/PR802">The C backend has only basic support for
488 inline assembly code</a>.</li>
Chris Lattnere0194462007-09-26 06:01:35 +0000[diff] [blame]489<li><a href="http://llvm.org/PR1658">The C backend violates the ABI of common
490 C++ programs</a>, preventing intermixing between C++ compiled by the CBE and
Duncan Sandsa73561c2008-06-08 20:18:35 +0000[diff] [blame]491 C++ code compiled with llc or native compilers.</li>
Duncan Sandsbd0ad6e2008-02-10 13:40:55 +0000[diff] [blame]492<li>The C backend does not support all exception handling constructs.</li>
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]493</ul>
494
495</div>
496
497
498<!-- ======================================================================= -->
499<div class="doc_subsection">
Chris Lattner499c07c2008-06-05 06:35:40 +0000[diff] [blame]500 <a name="c-fe">Known problems with the llvm-gcc C front-end</a>
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]501</div>
502
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]503<div class="doc_text">
504
Chris Lattnere0798082008-02-06 18:00:06 +0000[diff] [blame]505<p>llvm-gcc does not currently support <a href="http://llvm.org/PR869">Link-Time
506Optimization</a> on most platforms "out-of-the-box". Please inquire on the
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]507llvmdev mailing list if you are interested.</p>
508
Chris Lattner499c07c2008-06-05 06:35:40 +0000[diff] [blame]509<p>The only major language feature of GCC not supported by llvm-gcc is
510 the <tt>__builtin_apply</tt> family of builtins. However, some extensions
511 are only supported on some targets. For example, trampolines are only
Duncan Sandsa73561c2008-06-08 20:18:35 +0000[diff] [blame]512 supported on some targets (these are used when you take the address of a
513 nested function).</p>
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]514
Chris Lattner499c07c2008-06-05 06:35:40 +0000[diff] [blame]515<p>If you run into GCC extensions which are not supported, please let us know.
516</p>
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]517
518</div>
519
520<!-- ======================================================================= -->
521<div class="doc_subsection">
Chris Lattner499c07c2008-06-05 06:35:40 +0000[diff] [blame]522 <a name="c++-fe">Known problems with the llvm-gcc C++ front-end</a>
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]523</div>
524
525<div class="doc_text">
526
527<p>The C++ front-end is considered to be fully
528tested and works for a number of non-trivial programs, including LLVM
529itself, Qt, Mozilla, etc.</p>
530
531<ul>
Chris Lattner499c07c2008-06-05 06:35:40 +0000[diff] [blame]532<li>Exception handling works well on the X86 and PowerPC targets, including
Duncan Sandsa73561c2008-06-08 20:18:35 +0000[diff] [blame]533X86-64 darwin. This works when linking to a libstdc++ compiled by GCC. It is
534supported on X86-64 linux, but that is disabled by default in this release.</li>
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]535</ul>
536
537</div>
538
539
Chris Lattnerdaeb3232008-02-12 06:29:45 +0000[diff] [blame]540<!-- ======================================================================= -->
541<div class="doc_subsection">
Chris Lattner499c07c2008-06-05 06:35:40 +0000[diff] [blame]542 <a name="ada-fe">Known problems with the llvm-gcc Ada front-end</a>
Chris Lattnerdaeb3232008-02-12 06:29:45 +0000[diff] [blame]543</div>
544
545<div class="doc_text">
546The llvm-gcc 4.2 Ada compiler works fairly well, however this is not a mature
547technology and problems should be expected.
548<ul>
Duncan Sandsa73561c2008-06-08 20:18:35 +0000[diff] [blame]549<li>The Ada front-end currently only builds on X86-32. This is mainly due
Chris Lattnerdaeb3232008-02-12 06:29:45 +0000[diff] [blame]550to lack of trampoline support (pointers to nested functions) on other platforms,
Duncan Sandsa73561c2008-06-08 20:18:35 +0000[diff] [blame]551however it <a href="http://llvm.org/PR2006">also fails to build on X86-64</a>
Chris Lattnerdaeb3232008-02-12 06:29:45 +0000[diff] [blame]552which does support trampolines.</li>
553<li>The Ada front-end <a href="http://llvm.org/PR2007">fails to bootstrap</a>.
554Workaround: configure with --disable-bootstrap.</li>
555<li>The c380004 and <a href="http://llvm.org/PR2010">c393010</a> ACATS tests
Duncan Sandsa73561c2008-06-08 20:18:35 +0000[diff] [blame]556fail (c380004 also fails with gcc-4.2 mainline). When built at -O3, the
557<a href="http://llvm.org/PR2421">cxg2021</a> ACATS test also fails.</li>
558<li>Some gcc specific Ada tests continue to crash the compiler. The testsuite
559reports most tests as having failed even though they pass.</li>
Chris Lattnerdaeb3232008-02-12 06:29:45 +0000[diff] [blame]560<li>The -E binder option (exception backtraces)
561<a href="http://llvm.org/PR1982">does not work</a> and will result in programs
562crashing if an exception is raised. Workaround: do not use -E.</li>
563<li>Only discrete types <a href="http://llvm.org/PR1981">are allowed to start
564or finish at a non-byte offset</a> in a record. Workaround: do not pack records
565or use representation clauses that result in a field of a non-discrete type
566starting or finishing in the middle of a byte.</li>
Chris Lattnerd95b5962008-06-08 21:19:07 +0000[diff] [blame]567<li>The <tt>lli</tt> interpreter <a href="http://llvm.org/PR2009">considers
568'main' as generated by the Ada binder to be invalid</a>.
569Workaround: hand edit the file to use pointers for <tt>argv</tt> and
570<tt>envp</tt> rather than integers.</li>
571<li>The <tt>-fstack-check</tt> option <a href="http://llvm.org/PR2008">is
572ignored</a>.</li>
Chris Lattnerdaeb3232008-02-12 06:29:45 +0000[diff] [blame]573</ul>
574</div>
575
Dan Gohmanf17a25c2007-07-18 16:29:46 +0000[diff] [blame]576<!-- *********************************************************************** -->
577<div class="doc_section">
578 <a name="additionalinfo">Additional Information</a>
579</div>
580<!-- *********************************************************************** -->
581
582<div class="doc_text">
583
584<p>A wide variety of additional information is available on the <a
585href="http://llvm.org">LLVM web page</a>, in particular in the <a
586href="http://llvm.org/docs/">documentation</a> section. The web page also
587contains versions of the API documentation which is up-to-date with the
588Subversion version of the source code.
589You can access versions of these documents specific to this release by going
590into the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p>
591
592<p>If you have any questions or comments about LLVM, please feel free to contact
593us via the <a href="http://llvm.org/docs/#maillist"> mailing
594lists</a>.</p>
595
596</div>
597
598<!-- *********************************************************************** -->
599
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