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Chris Lattner2974b5b2004-04-01 00:41:31 +0000[diff] [blame]6 <title>LLVM 1.3 Release Notes</title>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]7</head>
8<body>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]9
Chris Lattner2974b5b2004-04-01 00:41:31 +0000[diff] [blame]10<div class="doc_title">LLVM 1.3 Release Notes</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]11
12<ol>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]13 <li><a href="#intro">Introduction</a></li>
14 <li><a href="#whatsnew">What's New?</a></li>
15 <li><a href="#portability">Portability and Supported Platforms</a></li>
16 <li><a href="#install-instructions">Installation Instructions</a></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]17 <li><a href="#knownproblems">Known Problems</a>
18 <ul>
Chris Lattner2974b5b2004-04-01 00:41:31 +0000[diff] [blame]19 <li><a href="#experimental">Experimental features included in this
20 release</a>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]21 <li><a href="#core">Known problems with the LLVM Core</a>
22 <li><a href="#c-fe">Known problems with the C Front-end</a>
23 <li><a href="#c++-fe">Known problems with the C++ Front-end</a>
24 <li><a href="#x86-be">Known problems with the X86 Back-end</a>
25 <li><a href="#sparc-be">Known problems with the Sparc Back-end</a>
26 <li><a href="#c-be">Known problems with the C back-end</a>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]27 </ul></li>
28 <li><a href="#additionalinfo">Additional Information</a></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]29</ol>
30
Misha Brukmane0c891c2003-11-22 01:00:11 +0000[diff] [blame]31<div class="doc_text">
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]32 <p><b>Written by the <a href="http://llvm.cs.uiuc.edu">LLVM team</a></b><p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]33</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]34
35<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]36<div class="doc_section">
37 <a name="intro">Introduction</a>
38</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]39<!-- *********************************************************************** -->
40
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]41<div class="doc_text">
42
43<p>This document contains the release notes for the LLVM compiler
Chris Lattner2974b5b2004-04-01 00:41:31 +0000[diff] [blame]44infrastructure, release 1.3. Here we describe the status of LLVM, including any
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]45known problems and bug fixes from the previous release. The most up-to-date
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]46version of this document can be found on the <a
Chris Lattner2974b5b2004-04-01 00:41:31 +0000[diff] [blame]47href="http://llvm.cs.uiuc.edu/releases/1.3/">LLVM 1.3 web site</a>. If you are
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]48not reading this on the LLVM web pages, you should probably go there because
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]49this document may be updated after the release.</p>
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]50
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]51<p>For more information about LLVM, including information about potentially more
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]52current releases, please check out the <a href="http://llvm.cs.uiuc.edu">main
53web site</a>. If you have questions or comments, the <a
54href="http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVM developer's mailing
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]55list</a> is a good place to send them.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]56
Chris Lattner9e848092003-12-12 04:25:33 +0000[diff] [blame]57<p>Note that if you are reading this file from CVS, this document applies
58to the <i>next</i> release, not the current one. To see the release notes for
59the current or previous releases, see the <a
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]60href="http://llvm.cs.uiuc.edu/releases/">releases page</a>.</p>
61
62</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]63
64<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]65<div class="doc_section">
66 <a name="whatsnew">What's New?</a>
67</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]68<!-- *********************************************************************** -->
69
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]70<div class="doc_text">
71
Chris Lattnera39719f2004-02-25 16:36:51 +0000[diff] [blame]72<p>
Chris Lattner2974b5b2004-04-01 00:41:31 +0000[diff] [blame]73This is the fourth public release of the LLVM compiler infrastructure.
Chris Lattnerb40efb32003-12-14 05:03:43 +0000[diff] [blame]74</p>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]75
Chris Lattner835104c2004-03-17 03:54:41 +0000[diff] [blame]76<p>
77At this time, LLVM is known to correctly compile and run all C &amp; C++ SPEC
78CPU2000 benchmarks, the Olden benchmarks, and the Ptrdist benchmarks. It has
79also been used to compile <b>many</b> other programs. LLVM now also works with
80a broad variety of C++ programs, though it has still received less testing than
81the C front-end.
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]82</p>
83
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]84<!--=========================================================================-->
85<div class="doc_subsubsection">
Chris Lattnera39719f2004-02-25 16:36:51 +0000[diff] [blame]86<a name="newfeatures">This release implements the following new features:</a>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]87</div>
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]88
89<ol>
Chris Lattner2974b5b2004-04-01 00:41:31 +0000[diff] [blame]90<li>The LLVM <a href="LangRef.html#i_select"><tt>select</tt></a> instruction is
91now fully implemented and supported by all targets.</li>
Chris Lattner55ee0312003-11-19 22:05:38 +0000[diff] [blame]92</ol>
Chris Lattner0ef19062003-11-08 04:28:55 +0000[diff] [blame]93
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]94
95<!--=========================================================================-->
96<div class="doc_subsubsection">
97In this release, the following missing features were implemented:
98</div>
Chris Lattner0ef19062003-11-08 04:28:55 +0000[diff] [blame]99
100<ol>
Chris Lattnerce8492d2004-04-05 01:43:08 +0000[diff] [blame^]101<li><a href="http://llvm.cs.uiuc.edu/PR82">LLVM cannot handle structures with more than 256 elements</a></li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]102</ol>
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]103
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]104
105<!--=========================================================================-->
106<div class="doc_subsubsection">
Chris Lattnera39719f2004-02-25 16:36:51 +0000[diff] [blame]107<a name="qualityofimp">In this release, the following Quality of Implementation issues were fixed:</a>
Chris Lattnere29ac162003-12-20 03:42:11 +0000[diff] [blame]108</div>
109
110<ol>
Chris Lattner89c60482004-04-05 00:40:55 +0000[diff] [blame]111<li><a href="http://llvm.cs.uiuc.edu/PR305">LLVM tools will happily spew bytecode onto your terminal</a></li>
Chris Lattnere29ac162003-12-20 03:42:11 +0000[diff] [blame]112</ol>
113
114<!--=========================================================================-->
115<div class="doc_subsubsection">
Chris Lattnera39719f2004-02-25 16:36:51 +0000[diff] [blame]116In this release, the following build problems were fixed:
Brian Gaeke6b31beb2004-01-16 21:55:04 +0000[diff] [blame]117</div>
118
119<ol>
Chris Lattner2974b5b2004-04-01 00:41:31 +0000[diff] [blame]120<li></li>
Brian Gaeke6b31beb2004-01-16 21:55:04 +0000[diff] [blame]121</ol>
122
123<!--=========================================================================-->
124<div class="doc_subsubsection">
Chris Lattnera39719f2004-02-25 16:36:51 +0000[diff] [blame]125<a name="codequality">In this release, the following Code Quality issues were fixed:</a>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]126</div>
Chris Lattner89ca2b82003-10-27 17:06:39 +0000[diff] [blame]127
128<ol>
Chris Lattnerce8492d2004-04-05 01:43:08 +0000[diff] [blame^]129<li><a href="http://llvm.cs.uiuc.edu/PR309">[vmcore] Code quality problem due to long operand of getelementptr</a></li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]130</ol>
Chris Lattner89ca2b82003-10-27 17:06:39 +0000[diff] [blame]131
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]132
133<!--=========================================================================-->
134<div class="doc_subsubsection">
Chris Lattnera39719f2004-02-25 16:36:51 +0000[diff] [blame]135<a name="bugfix">In this release, the following bugs in the previous release were fixed:</a>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]136</div>
137
138<p>Bugs in the LLVM Core:</p>
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]139
140<ol>
Chris Lattner1869a462004-04-01 19:09:49 +0000[diff] [blame]141<li><a href="http://llvm.cs.uiuc.edu/PR306">[loopsimplify] Loop simplify incorrectly updates dominator information</a></li>
Chris Lattner56d0f112004-04-01 20:31:29 +0000[diff] [blame]142<li><a href="http://llvm.cs.uiuc.edu/PR310">[tailduplicate] DemoteRegToStack breaks SSA form</a></li>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]143</ol>
144
145
Chris Lattner56e67052004-02-09 21:22:51 +0000[diff] [blame]146
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]147<p>Bugs in the C/C++ front-end:</p>
148
149<ol>
Chris Lattner2974b5b2004-04-01 00:41:31 +0000[diff] [blame]150<li></li>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]151</ol>
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]152
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]153</div>
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]154
155<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]156<div class="doc_section">
157 <a name="portability">Portability and Supported Platforms</a>
158</div>
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]159<!-- *********************************************************************** -->
160
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]161<div class="doc_text">
162
163<p>LLVM has been extensively tested on Intel and AMD machines running Red
Chris Lattnerb40efb32003-12-14 05:03:43 +0000[diff] [blame]164Hat Linux and FreeBSD. It has also been tested on Sun UltraSPARC workstations running Solaris 8.
John Criswellbb1bad52003-12-12 19:54:20 +0000[diff] [blame]165Additionally,
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]166LLVM works on Mac OS X 10.3 and above, but only with the C backend or
Chris Lattner9e848092003-12-12 04:25:33 +0000[diff] [blame]167interpreter (no native backend for the PowerPC is available yet).
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]168The core LLVM infrastructure uses "autoconf" for portability, so hopefully we
Chris Lattner3e2959e2003-11-08 05:22:09 +0000[diff] [blame]169work on more platforms than that. However, it is likely that we
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]170missed something and that minor porting is required to get LLVM to work on
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]171new platforms. We welcome portability patches and error messages.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]172
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]173</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]174
175<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]176<div class="doc_section">
177 <a name="knownproblems">Known Problems</a>
178</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]179<!-- *********************************************************************** -->
180
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]181<div class="doc_text">
182
183<p>This section contains all known problems with the LLVM system, listed by
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]184component. As new problems are discovered, they will be added to these
Chris Lattner5eccca42003-12-12 21:22:16 +0000[diff] [blame]185sections. If you run into a problem, please check the <a
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]186href="http://llvm.cs.uiuc.edu/bugs/">LLVM bug database</a> and submit a bug if
Chris Lattner5eccca42003-12-12 21:22:16 +0000[diff] [blame]187there isn't already one.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]188
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]189</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]190
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]191<!-- ======================================================================= -->
192<div class="doc_subsection">
193 <a name="experimental">Experimental features included with this release</a>
194</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]195
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]196<div class="doc_text">
197
198<p>
199The following components of this LLVM release are either untested, known to be
200broken or unreliable, or are in early development. These components should not
201be relied on, and bugs should not be filed against them, but they may be useful
202to some people. In particular, if you would like to work on one of these
203components, please contact us on the llvmdev list.
204</p>
205
206<ul>
207<li>The following passes are incomplete or buggy: <tt>-pgmdep, -memdep,
208 -ipmodref, -sortstructs, -swapstructs, -cee</tt></li>
209
210<li>The <tt>-pre</tt> pass is incomplete (there are cases it doesn't handle that
211 it should) and not thoroughly tested.</li>
212<li>The <tt>llvm-ar</tt> tool is incomplete and probably buggy.</li>
213<li>The <tt>llvm-db</tt> tool is in a very early stage of development.</li>
214</ul>
215
216</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]217
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]218<!-- ======================================================================= -->
219<div class="doc_subsection">
220 <a name="core">Known problems with the LLVM Core</a>
221</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]222
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]223<div class="doc_text">
224
225<ul>
226
227<li>In the JIT, <tt>dlsym</tt> on a symbol compiled by the JIT will not
228work.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]229
230<li>The JIT does not use mutexes to protect its internal data structures. As
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]231such, execution of a threaded program could cause these data structures to be
232corrupted.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]233
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]234<li>It is not possible to <tt>dlopen</tt> an LLVM bytecode file in the JIT.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]235
Chris Lattnere84843b2003-10-20 19:05:03 +0000[diff] [blame]236<li>Linking in static archive files (.a files) is very slow (there is no symbol
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]237table in the archive).</li>
Chris Lattner2855ecd2003-11-04 20:06:53 +0000[diff] [blame]238
Chris Lattner2e6fcaf2004-02-15 23:09:07 +0000[diff] [blame]239<li>The gccld program <a href="http://llvm.cs.uiuc.edu/PR139">does not link objects/archives in the order specified on the command line.</a></li>
240
241<li><a href="http://llvm.cs.uiuc.edu/PR240">The lower-invoke pass does not mark
John Criswelld46c6962004-03-12 21:29:42 +0000[diff] [blame]242values live across a setjmp as volatile</a>. This missing feature only affects
Chris Lattner2e6fcaf2004-02-15 23:09:07 +0000[diff] [blame]243targets whose setjmp/longjmp libraries do not save and restore the entire
244register file.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]245</ul>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]246</div>
247
248<!-- ======================================================================= -->
249<div class="doc_subsection">
250 <a name="c-fe">Known problems with the C front-end</a>
251</div>
Chris Lattner47588f92003-10-02 05:07:23 +0000[diff] [blame]252
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]253<!-- _______________________________________________________________________ -->
Chris Lattnerb40efb32003-12-14 05:03:43 +0000[diff] [blame]254<div class="doc_subsubsection">Bugs</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]255
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]256<div class="doc_text">
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]257<ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]258<li>C99 Variable sized arrays do not release stack memory when they go out of
259 scope. Thus, the following program may run out of stack space:
260<pre>
261 for (i = 0; i != 1000000; ++i) {
262 int X[n];
263 foo(X);
264 }
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]265</pre></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]266
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]267<li>
268Initialization of global union variables can only be done
269<a href="http://llvm.cs.uiuc.edu/bugs/show_bug.cgi?id=162">with the largest
270union member</a>.
271</li>
Chris Lattnerf580cdc2004-03-16 21:39:04 +0000[diff] [blame]272
273<li><a href="http://llvm.cs.uiuc.edu/PR244">[llvm-gcc] Error when an implicitly external function is re-declared as static</a></li>
274
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]275</ul>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]276</div>
277
278<!-- _______________________________________________________________________ -->
279<div class="doc_subsubsection">
280 Notes
281</div>
282
283<div class="doc_text">
284
285<ul>
286
287<li>Inline assembly is not yet supported.</li>
Chris Lattnere01fcfb2003-10-27 18:30:37 +0000[diff] [blame]288
289<li>"long double" is transformed by the front-end into "double". There is no
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]290support for floating point data types of any size other than 32 and 64
291bits.</li>
292
293<li>The following Unix system functionality has not been tested and may not
294work:
Misha Brukmane0c891c2003-11-22 01:00:11 +0000[diff] [blame]295 <ol>
296 <li><tt>sigsetjmp</tt>, <tt>siglongjmp</tt> - These are not turned into the
297 appropriate <tt>invoke</tt>/<tt>unwind</tt> instructions. Note that
298 <tt>setjmp</tt> and <tt>longjmp</tt> <em>are</em> compiled correctly.
299 <li><tt>getcontext</tt>, <tt>setcontext</tt>, <tt>makecontext</tt>
300 - These functions have not been tested.
301 </ol></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]302
303<li>Although many GCC extensions are supported, some are not. In particular,
304 the following extensions are known to <b>not be</b> supported:
305 <ol>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]306 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Local-Labels.html#Local%20Labels">Local Labels</a>: Labels local to a block.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]307 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Nested-Functions.html#Nested%20Functions">Nested Functions</a>: As in Algol and Pascal, lexical scoping of functions.</li>
308 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Constructing-Calls.html#Constructing%20Calls">Constructing Calls</a>: Dispatching a call to another function.</li>
309 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Extended-Asm.html#Extended%20Asm">Extended Asm</a>: Assembler instructions with C expressions as operands.</li>
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]310 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Constraints.html#Constraints">Constraints</a>: Constraints for asm operands.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]311 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Asm-Labels.html#Asm%20Labels">Asm Labels</a>: Specifying the assembler name to use for a C symbol.</li>
312 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Explicit-Reg-Vars.html#Explicit%20Reg%20Vars">Explicit Reg Vars</a>: Defining variables residing in specified registers.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]313 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Vector-Extensions.html#Vector%20Extensions">Vector Extensions</a>: Using vector instructions through built-in functions.</li>
314 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Target-Builtins.html#Target%20Builtins">Target Builtins</a>: Built-in functions specific to particular targets.</li>
315 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Thread-Local.html#Thread-Local">Thread-Local</a>: Per-thread variables.</li>
316 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Pragmas.html#Pragmas">Pragmas</a>: Pragmas accepted by GCC.</li>
Misha Brukmane0c891c2003-11-22 01:00:11 +0000[diff] [blame]317 </ol>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]318
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]319 <p>The following GCC extensions are <b>partially</b> supported. An ignored
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]320 attribute means that the LLVM compiler ignores the presence of the attribute,
321 but the code should still work. An unsupported attribute is one which is
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]322 ignored by the LLVM compiler and will cause a different interpretation of
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]323 the program.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]324
325 <ol>
326 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Length.html#Variable%20Length">Variable Length</a>:
327 Arrays whose length is computed at run time.<br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]328 Supported, but allocated stack space is not freed until the function returns (noted above).</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]329
330 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html#Function%20Attributes">Function Attributes</a>:
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]331
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]332 Declaring that functions have no side effects or that they can never
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]333 return.<br>
334
335 <b>Supported:</b> <tt>format</tt>, <tt>format_arg</tt>, <tt>non_null</tt>,
336 <tt>constructor</tt>, <tt>destructor</tt>, <tt>unused</tt>,
337 <tt>deprecated</tt>, <tt>warn_unused_result</tt>, <tt>weak</tt><br>
338
339 <b>Ignored:</b> <tt>noreturn</tt>, <tt>noinline</tt>,
340 <tt>always_inline</tt>, <tt>pure</tt>, <tt>const</tt>, <tt>nothrow</tt>,
341 <tt>malloc</tt>, <tt>no_instrument_function</tt>, <tt>cdecl</tt><br>
342
343 <b>Unsupported:</b> <tt>used</tt>, <tt>section</tt>, <tt>alias</tt>,
344 <tt>visibility</tt>, <tt>regparm</tt>, <tt>stdcall</tt>,
345 <tt>fastcall</tt>, all other target specific attributes</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]346
347 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Attributes.html#Variable%20Attributes">Variable Attributes</a>:
348 Specifying attributes of variables.<br>
349 <b>Supported:</b> <tt>cleanup</tt>, <tt>common</tt>, <tt>nocommon</tt>,
350 <tt>deprecated</tt>, <tt>transparent_union</tt>,
351 <tt>unused</tt>, <tt>weak</tt><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]352
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]353 <b>Unsupported:</b> <tt>aligned</tt>, <tt>mode</tt>, <tt>packed</tt>,
354 <tt>section</tt>, <tt>shared</tt>, <tt>tls_model</tt>,
355 <tt>vector_size</tt>, <tt>dllimport</tt>,
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]356 <tt>dllexport</tt>, all target specific attributes.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]357
Misha Brukmanc4b7bee2003-12-12 04:37:31 +0000[diff] [blame]358 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Type-Attributes.html#Type%20Attributes">Type Attributes</a>: Specifying attributes of types.<br>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]359 <b>Supported:</b> <tt>transparent_union</tt>, <tt>unused</tt>,
Misha Brukmanc4b7bee2003-12-12 04:37:31 +0000[diff] [blame]360 <tt>deprecated</tt>, <tt>may_alias</tt><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]361
362 <b>Unsupported:</b> <tt>aligned</tt>, <tt>packed</tt>,
363 all target specific attributes.</li>
364
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]365 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html#Other%20Builtins">Other Builtins</a>:
366 Other built-in functions.<br>
367 We support all builtins which have a C language equivalent (e.g.,
368 <tt>__builtin_cos</tt>), <tt>__builtin_alloca</tt>,
369 <tt>__builtin_types_compatible_p</tt>, <tt>__builtin_choose_expr</tt>,
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]370 <tt>__builtin_constant_p</tt>, and <tt>__builtin_expect</tt> (ignored).</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]371
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]372 </ol>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]373
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]374 <p>The following extensions <b>are</b> known to be supported:</p>
375
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]376 <ol>
Chris Lattner7fe97dd2004-03-16 08:54:07 +0000[diff] [blame]377 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Labels-as-Values.html#Labels%20as%20Values">Labels as Values</a>: Getting pointers to labels and computed gotos.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]378 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html#Statement%20Exprs">Statement Exprs</a>: Putting statements and declarations inside expressions.</li>
379 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Typeof.html#Typeof">Typeof</a>: <code>typeof</code>: referring to the type of an expression.</li>
380 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Lvalues.html#Lvalues">Lvalues</a>: Using <code>?:</code>, "<code>,</code>" and casts in lvalues.</li>
381 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Conditionals.html#Conditionals">Conditionals</a>: Omitting the middle operand of a <code>?:</code> expression.</li>
382 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Long-Long.html#Long%20Long">Long Long</a>: Double-word integers.</li>
383 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Complex.html#Complex">Complex</a>: Data types for complex numbers.</li>
384 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Hex-Floats.html#Hex%20Floats">Hex Floats</a>:Hexadecimal floating-point constants.</li>
385 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html#Zero%20Length">Zero Length</a>: Zero-length arrays.</li>
386 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Empty-Structures.html#Empty%20Structures">Empty Structures</a>: Structures with no members.</li>
387 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variadic-Macros.html#Variadic%20Macros">Variadic Macros</a>: Macros with a variable number of arguments.</li>
388 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Escaped-Newlines.html#Escaped%20Newlines">Escaped Newlines</a>: Slightly looser rules for escaped newlines.</li>
389 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Subscripting.html#Subscripting">Subscripting</a>: Any array can be subscripted, even if not an lvalue.</li>
Misha Brukmanc4b7bee2003-12-12 04:37:31 +0000[diff] [blame]390 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Pointer-Arith.html#Pointer%20Arith">Pointer Arith</a>: Arithmetic on <code>void</code>-pointers and function pointers.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]391 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Initializers.html#Initializers">Initializers</a>: Non-constant initializers.</li>
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]392 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Compound-Literals.html#Compound%20Literals">Compound Literals</a>: Compound literals give structures, unions,
393or arrays as values.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]394 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Designated-Inits.html#Designated%20Inits">Designated Inits</a>: Labeling elements of initializers.</li>
Misha Brukmanc4b7bee2003-12-12 04:37:31 +0000[diff] [blame]395 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Cast-to-Union.html#Cast%20to%20Union">Cast to Union</a>: Casting to union type from any member of the union.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]396 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Case-Ranges.html#Case%20Ranges">Case Ranges</a>: `case 1 ... 9' and such.</li>
397 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Mixed-Declarations.html#Mixed%20Declarations">Mixed Declarations</a>: Mixing declarations and code.</li>
398 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Function-Prototypes.html#Function%20Prototypes">Function Prototypes</a>: Prototype declarations and old-style definitions.</li>
399 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/C---Comments.html#C++%20Comments">C++ Comments</a>: C++ comments are recognized.</li>
400 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Dollar-Signs.html#Dollar%20Signs">Dollar Signs</a>: Dollar sign is allowed in identifiers.</li>
401 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Character-Escapes.html#Character%20Escapes">Character Escapes</a>: <code>\e</code> stands for the character &lt;ESC&gt;.</li>
402 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Alignment.html#Alignment">Alignment</a>: Inquiring about the alignment of a type or variable.</li>
403 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Inline.html#Inline">Inline</a>: Defining inline functions (as fast as macros).</li>
404 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Alternate-Keywords.html#Alternate%20Keywords">Alternate Keywords</a>:<code>__const__</code>, <code>__asm__</code>, etc., for header files.</li>
405 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Incomplete-Enums.html#Incomplete%20Enums">Incomplete Enums</a>: <code>enum foo;</code>, with details to follow.</li>
406 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Function-Names.html#Function%20Names">Function Names</a>: Printable strings which are the name of the current function.</li>
Chris Lattner25795bc2004-02-14 04:08:29 +0000[diff] [blame]407 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Return-Address.html#Return%20Address">Return Address</a>: Getting the return or frame address of a function.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]408 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Unnamed-Fields.html#Unnamed%20Fields">Unnamed Fields</a>: Unnamed struct/union fields within structs/unions.</li>
409 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Attribute-Syntax.html#Attribute%20Syntax">Attribute Syntax</a>: Formal syntax for attributes.</li>
Misha Brukmane0c891c2003-11-22 01:00:11 +0000[diff] [blame]410 </ol></li>
411
412</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]413
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]414<p>If you run into GCC extensions which have not been included in any of these
415lists, please let us know (also including whether or not they work).</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]416
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]417</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]418
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]419<!-- ======================================================================= -->
420<div class="doc_subsection">
421 <a name="c++-fe">Known problems with the C++ front-end</a>
422</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]423
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]424<div class="doc_text">
425
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]426<p>For this release, the C++ front-end is considered to be fully functional but
Chris Lattner9e848092003-12-12 04:25:33 +0000[diff] [blame]427has not been tested as thoroughly as the C front-end. It has been tested and
428works for a number of non-trivial programs, but there may be lurking bugs.
429Please report any bugs or problems.</p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]430
431</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]432
433<!-- _______________________________________________________________________ -->
Chris Lattner3a51be12004-02-14 04:12:41 +0000[diff] [blame]434<div class="doc_subsubsection">Bugs</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]435
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]436<div class="doc_text">
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]437
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]438<ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]439<li>The C++ front-end inherits all problems afflicting the <a href="#c-fe">C
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]440 front-end</a>.</li>
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]441</ul>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]442</div>
443
444<!-- _______________________________________________________________________ -->
445<div class="doc_subsubsection">
446 Notes
447</div>
448
449<div class="doc_text">
450
451<ul>
Chris Lattnere01fcfb2003-10-27 18:30:37 +0000[diff] [blame]452
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]453<li>The C++ front-end is based on a pre-release of the GCC 3.4 C++ parser. This
454parser is significantly more standards compliant (and picky) than prior GCC
455versions. For more information, see the C++ section of the <a
Chris Lattner9e848092003-12-12 04:25:33 +0000[diff] [blame]456href="http://gcc.gnu.org/gcc-3.4/changes.html">GCC 3.4 release notes</a>.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]457
458<li>Destructors for local objects are not always run when a <tt>longjmp</tt> is
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]459 performed. In particular, destructors for objects in the <tt>longjmp</tt>ing
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]460 function and in the <tt>setjmp</tt> receiver function may not be run.
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]461 Objects in intervening stack frames will be destroyed, however (which is
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]462 better than most compilers).</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]463
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]464<li>The LLVM C++ front-end follows the <a
465 href="http://www.codesourcery.com/cxx-abi">Itanium C++ ABI</a>.
466 This document, which is not Itanium specific, specifies a standard for name
467 mangling, class layout, v-table layout, RTTI formats, and other C++
468 representation issues. Because we use this API, code generated by the LLVM
469 compilers should be binary compatible with machine code generated by other
470 Itanium ABI C++ compilers (such as G++, the Intel and HP compilers, etc).
471 <i>However</i>, the exception handling mechanism used by LLVM is very
472 different from the model used in the Itanium ABI, so <b>exceptions will not
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]473 interact correctly</b>. </li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]474
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]475</ul>
Chris Lattnerfcc54b32003-10-07 22:14:37 +0000[diff] [blame]476
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]477</div>
478
479<!-- ======================================================================= -->
480<div class="doc_subsection">
481 <a name="x86-be">Known problems with the X86 back-end</a>
482</div>
483
484<div class="doc_text">
485
486<ul>
Chris Lattnerde4afdc2004-02-08 22:23:33 +0000[diff] [blame]487<li>None so far.
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]488</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]489
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]490</div>
491
492<!-- ======================================================================= -->
493<div class="doc_subsection">
494 <a name="sparc-be">Known problems with the Sparc back-end</a>
495</div>
496
497<div class="doc_text">
498
499<ul>
Chris Lattner6a39aa52004-03-19 19:22:28 +0000[diff] [blame]500<li>There are several programs in the LLVM testsuite that the Sparc code generator is known to miscompile.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]501</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]502
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]503</div>
504
505<!-- ======================================================================= -->
506<div class="doc_subsection">
507 <a name="c-be">Known problems with the C back-end</a>
508</div>
509
510<div class="doc_text">
511
512<ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]513
514<li>The C back-end produces code that violates the ANSI C Type-Based Alias
515Analysis rules. As such, special options may be necessary to compile the code
516(for example, GCC requires the <tt>-fno-strict-aliasing</tt> option). This
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]517problem probably cannot be fixed.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]518
Chris Lattnere84843b2003-10-20 19:05:03 +0000[diff] [blame]519<li><a href="http://llvm.cs.uiuc.edu/PR33">Initializers for global variables</a>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]520cannot include special floating point numbers like Not-A-Number or
521Infinity.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]522
Chris Lattner2855ecd2003-11-04 20:06:53 +0000[diff] [blame]523<li><a href="http://llvm.cs.uiuc.edu/PR56">Zero arg vararg functions are not
Chris Lattner2af46052003-10-24 04:03:19 +0000[diff] [blame]524supported</a>. This should not affect LLVM produced by the C or C++
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]525frontends.</li>
Chris Lattner2af46052003-10-24 04:03:19 +0000[diff] [blame]526
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]527</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]528
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]529</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]530
531<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]532<div class="doc_section">
533 <a name="additionalinfo">Additional Information</a>
534</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]535<!-- *********************************************************************** -->
536
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]537<div class="doc_text">
538
539<p>A wide variety of additional information is available on the LLVM web page,
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]540including mailing lists and publications describing algorithms and components
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]541implemented in LLVM. The web page also contains versions of the API
542documentation which is up-to-date with the CVS version of the source code. You
543can access versions of these documents specific to this release by going into
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]544the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]545
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]546<p>If you have any questions or comments about LLVM, please feel free to contact
Chris Lattner5eccca42003-12-12 21:22:16 +0000[diff] [blame]547us via the <a href="http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev">mailing
548lists</a>.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]549
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]550</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]551
552<!-- *********************************************************************** -->
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]553
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]554<hr>
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]555<address>
Misha Brukman38847d52003-12-21 22:53:21 +0000[diff] [blame]556 <a href="http://jigsaw.w3.org/css-validator/check/referer"><img
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]557 src="http://jigsaw.w3.org/css-validator/images/vcss" alt="Valid CSS!"></a>
558 <a href="http://validator.w3.org/check/referer"><img
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