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Chris Lattner1a7e43c2004-04-01 00:41:31 +0000[diff] [blame]6 <title>LLVM 1.3 Release Notes</title>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]7</head>
8<body>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]9
Chris Lattner1a7e43c2004-04-01 00:41:31 +0000[diff] [blame]10<div class="doc_title">LLVM 1.3 Release Notes</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]11
12<ol>
Misha Brukman80731b92003-11-22 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 Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]17 <li><a href="#knownproblems">Known Problems</a>
18 <ul>
Chris Lattner1a7e43c2004-04-01 00:41:31 +0000[diff] [blame]19 <li><a href="#experimental">Experimental features included in this
20 release</a>
Chris Lattner3d482502003-10-02 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 Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]27 </ul></li>
28 <li><a href="#additionalinfo">Additional Information</a></li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]29</ol>
30
Misha Brukman7cb4e382003-11-22 01:00:11 +0000[diff] [blame]31<div class="doc_text">
John Criswell86a3a482003-12-18 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 Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]33</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]34
35<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]36<div class="doc_section">
37 <a name="intro">Introduction</a>
38</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]39<!-- *********************************************************************** -->
40
Misha Brukman80731b92003-11-22 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 Lattner1a7e43c2004-04-01 00:41:31 +0000[diff] [blame]44infrastructure, release 1.3. Here we describe the status of LLVM, including any
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]45known problems and bug fixes from the previous release. The most up-to-date
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]46version of this document can be found on the <a
Chris Lattner1a7e43c2004-04-01 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 Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]48not reading this on the LLVM web pages, you should probably go there because
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]49this document may be updated after the release.</p>
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]50
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]51<p>For more information about LLVM, including information about potentially more
Chris Lattnere7525b52003-10-07 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 Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]55list</a> is a good place to send them.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]56
Chris Lattnere76e9ab2003-12-12 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 Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]60href="http://llvm.cs.uiuc.edu/releases/">releases page</a>.</p>
61
62</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]63
64<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]65<div class="doc_section">
66 <a name="whatsnew">What's New?</a>
67</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]68<!-- *********************************************************************** -->
69
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]70<div class="doc_text">
71
Chris Lattner8ebf2532004-02-25 16:36:51 +0000[diff] [blame]72<p>
Chris Lattner1a7e43c2004-04-01 00:41:31 +0000[diff] [blame]73This is the fourth public release of the LLVM compiler infrastructure.
Chris Lattner5a8a7282003-12-14 05:03:43 +0000[diff] [blame]74</p>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]75
Chris Lattner28202352004-03-17 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 Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]82</p>
83
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]84<!--=========================================================================-->
85<div class="doc_subsubsection">
Chris Lattner8ebf2532004-02-25 16:36:51 +0000[diff] [blame]86<a name="newfeatures">This release implements the following new features:</a>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]87</div>
Chris Lattnere7525b52003-10-07 21:38:31 +0000[diff] [blame]88
89<ol>
Chris Lattner1a7e43c2004-04-01 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 Lattner4e344922004-04-06 19:48:42 +0000[diff] [blame^]92<li>Bugpoint can now narrow down code-generation bugs to a loop nest, where before it could only narrow them down to a function being miscompiled.</li>
Chris Lattner592db402003-11-19 22:05:38 +0000[diff] [blame]93</ol>
Chris Lattner4491de62003-11-08 04:28:55 +0000[diff] [blame]94
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]95
96<!--=========================================================================-->
97<div class="doc_subsubsection">
98In this release, the following missing features were implemented:
99</div>
Chris Lattner4491de62003-11-08 04:28:55 +0000[diff] [blame]100
101<ol>
Chris Lattner677202b2004-04-05 01:43:08 +0000[diff] [blame]102<li><a href="http://llvm.cs.uiuc.edu/PR82">LLVM cannot handle structures with more than 256 elements</a></li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]103</ol>
Chris Lattnere7525b52003-10-07 21:38:31 +0000[diff] [blame]104
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]105
106<!--=========================================================================-->
107<div class="doc_subsubsection">
Chris Lattner8ebf2532004-02-25 16:36:51 +0000[diff] [blame]108<a name="qualityofimp">In this release, the following Quality of Implementation issues were fixed:</a>
Chris Lattner4df78f02003-12-20 03:42:11 +0000[diff] [blame]109</div>
110
111<ol>
Chris Lattnere916f162004-04-05 00:40:55 +0000[diff] [blame]112<li><a href="http://llvm.cs.uiuc.edu/PR305">LLVM tools will happily spew bytecode onto your terminal</a></li>
Chris Lattner4df78f02003-12-20 03:42:11 +0000[diff] [blame]113</ol>
114
115<!--=========================================================================-->
116<div class="doc_subsubsection">
Chris Lattner8ebf2532004-02-25 16:36:51 +0000[diff] [blame]117In this release, the following build problems were fixed:
Brian Gaeke8b05e4f2004-01-16 21:55:04 +0000[diff] [blame]118</div>
119
120<ol>
Chris Lattner1a7e43c2004-04-01 00:41:31 +0000[diff] [blame]121<li></li>
Brian Gaeke8b05e4f2004-01-16 21:55:04 +0000[diff] [blame]122</ol>
123
124<!--=========================================================================-->
125<div class="doc_subsubsection">
Chris Lattner8ebf2532004-02-25 16:36:51 +0000[diff] [blame]126<a name="codequality">In this release, the following Code Quality issues were fixed:</a>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]127</div>
Chris Lattner639579c2003-10-27 17:06:39 +0000[diff] [blame]128
129<ol>
Chris Lattner677202b2004-04-05 01:43:08 +0000[diff] [blame]130<li><a href="http://llvm.cs.uiuc.edu/PR309">[vmcore] Code quality problem due to long operand of getelementptr</a></li>
Chris Lattner4e344922004-04-06 19:48:42 +0000[diff] [blame^]131<li>The X86 backend now generates substantially better code for 64-bit integer operations.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]132</ol>
Chris Lattner639579c2003-10-27 17:06:39 +0000[diff] [blame]133
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]134
135<!--=========================================================================-->
136<div class="doc_subsubsection">
Chris Lattner8ebf2532004-02-25 16:36:51 +0000[diff] [blame]137<a name="bugfix">In this release, the following bugs in the previous release were fixed:</a>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]138</div>
139
140<p>Bugs in the LLVM Core:</p>
Chris Lattnere7525b52003-10-07 21:38:31 +0000[diff] [blame]141
142<ol>
Chris Lattnerff03fe32004-04-01 19:09:49 +0000[diff] [blame]143<li><a href="http://llvm.cs.uiuc.edu/PR306">[loopsimplify] Loop simplify incorrectly updates dominator information</a></li>
Chris Lattnerfd8f46b2004-04-01 20:31:29 +0000[diff] [blame]144<li><a href="http://llvm.cs.uiuc.edu/PR310">[tailduplicate] DemoteRegToStack breaks SSA form</a></li>
Chris Lattner4e344922004-04-06 19:48:42 +0000[diff] [blame^]145<li><a href="http://llvm.cs.uiuc.edu/PR313">[X86] JIT miscompiles unsigned short to floating point cast</a></li>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]146</ol>
147
148
Chris Lattner24fa5662004-02-09 21:22:51 +0000[diff] [blame]149
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]150<p>Bugs in the C/C++ front-end:</p>
151
152<ol>
Chris Lattner1a7e43c2004-04-01 00:41:31 +0000[diff] [blame]153<li></li>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]154</ol>
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]155
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]156</div>
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]157
158<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]159<div class="doc_section">
160 <a name="portability">Portability and Supported Platforms</a>
161</div>
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]162<!-- *********************************************************************** -->
163
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]164<div class="doc_text">
165
166<p>LLVM has been extensively tested on Intel and AMD machines running Red
Chris Lattner5a8a7282003-12-14 05:03:43 +0000[diff] [blame]167Hat Linux and FreeBSD. It has also been tested on Sun UltraSPARC workstations running Solaris 8.
John Criswell604cd3c2003-12-12 19:54:20 +0000[diff] [blame]168Additionally,
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]169LLVM works on Mac OS X 10.3 and above, but only with the C backend or
Chris Lattnere76e9ab2003-12-12 04:25:33 +0000[diff] [blame]170interpreter (no native backend for the PowerPC is available yet).
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]171The core LLVM infrastructure uses "autoconf" for portability, so hopefully we
Chris Lattner14b5d5a2003-11-08 05:22:09 +0000[diff] [blame]172work on more platforms than that. However, it is likely that we
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]173missed something and that minor porting is required to get LLVM to work on
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]174new platforms. We welcome portability patches and error messages.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]175
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]176</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]177
178<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]179<div class="doc_section">
180 <a name="knownproblems">Known Problems</a>
181</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]182<!-- *********************************************************************** -->
183
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]184<div class="doc_text">
185
186<p>This section contains all known problems with the LLVM system, listed by
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]187component. As new problems are discovered, they will be added to these
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]188sections. If you run into a problem, please check the <a
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]189href="http://llvm.cs.uiuc.edu/bugs/">LLVM bug database</a> and submit a bug if
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]190there isn't already one.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]191
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]192</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]193
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]194<!-- ======================================================================= -->
195<div class="doc_subsection">
196 <a name="experimental">Experimental features included with this release</a>
197</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]198
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]199<div class="doc_text">
200
201<p>
202The following components of this LLVM release are either untested, known to be
203broken or unreliable, or are in early development. These components should not
204be relied on, and bugs should not be filed against them, but they may be useful
205to some people. In particular, if you would like to work on one of these
206components, please contact us on the llvmdev list.
207</p>
208
209<ul>
210<li>The following passes are incomplete or buggy: <tt>-pgmdep, -memdep,
211 -ipmodref, -sortstructs, -swapstructs, -cee</tt></li>
212
213<li>The <tt>-pre</tt> pass is incomplete (there are cases it doesn't handle that
214 it should) and not thoroughly tested.</li>
215<li>The <tt>llvm-ar</tt> tool is incomplete and probably buggy.</li>
216<li>The <tt>llvm-db</tt> tool is in a very early stage of development.</li>
217</ul>
218
219</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]220
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]221<!-- ======================================================================= -->
222<div class="doc_subsection">
223 <a name="core">Known problems with the LLVM Core</a>
224</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]225
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]226<div class="doc_text">
227
228<ul>
229
230<li>In the JIT, <tt>dlsym</tt> on a symbol compiled by the JIT will not
231work.</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]232
233<li>The JIT does not use mutexes to protect its internal data structures. As
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]234such, execution of a threaded program could cause these data structures to be
235corrupted.</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]236
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]237<li>It is not possible to <tt>dlopen</tt> an LLVM bytecode file in the JIT.</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]238
Chris Lattnera623e482003-10-20 19:05:03 +0000[diff] [blame]239<li>Linking in static archive files (.a files) is very slow (there is no symbol
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]240table in the archive).</li>
Chris Lattnerc679fbb2003-11-04 20:06:53 +0000[diff] [blame]241
Chris Lattneraebc66a2004-02-15 23:09:07 +0000[diff] [blame]242<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>
243
244<li><a href="http://llvm.cs.uiuc.edu/PR240">The lower-invoke pass does not mark
John Criswell5d6345a2004-03-12 21:29:42 +0000[diff] [blame]245values live across a setjmp as volatile</a>. This missing feature only affects
Chris Lattneraebc66a2004-02-15 23:09:07 +0000[diff] [blame]246targets whose setjmp/longjmp libraries do not save and restore the entire
247register file.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]248</ul>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]249</div>
250
251<!-- ======================================================================= -->
252<div class="doc_subsection">
253 <a name="c-fe">Known problems with the C front-end</a>
254</div>
Chris Lattner178f3db2003-10-02 05:07:23 +0000[diff] [blame]255
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]256<!-- _______________________________________________________________________ -->
Chris Lattner5a8a7282003-12-14 05:03:43 +0000[diff] [blame]257<div class="doc_subsubsection">Bugs</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]258
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]259<div class="doc_text">
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]260<ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]261<li>C99 Variable sized arrays do not release stack memory when they go out of
262 scope. Thus, the following program may run out of stack space:
263<pre>
264 for (i = 0; i != 1000000; ++i) {
265 int X[n];
266 foo(X);
267 }
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]268</pre></li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]269
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]270<li>
271Initialization of global union variables can only be done
272<a href="http://llvm.cs.uiuc.edu/bugs/show_bug.cgi?id=162">with the largest
273union member</a>.
274</li>
Chris Lattner1ab58dd2004-03-16 21:39:04 +0000[diff] [blame]275
276<li><a href="http://llvm.cs.uiuc.edu/PR244">[llvm-gcc] Error when an implicitly external function is re-declared as static</a></li>
277
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]278</ul>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]279</div>
280
281<!-- _______________________________________________________________________ -->
282<div class="doc_subsubsection">
283 Notes
284</div>
285
286<div class="doc_text">
287
288<ul>
289
290<li>Inline assembly is not yet supported.</li>
Chris Lattnerd2a74272003-10-27 18:30:37 +0000[diff] [blame]291
292<li>"long double" is transformed by the front-end into "double". There is no
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]293support for floating point data types of any size other than 32 and 64
294bits.</li>
295
296<li>The following Unix system functionality has not been tested and may not
297work:
Misha Brukman7cb4e382003-11-22 01:00:11 +0000[diff] [blame]298 <ol>
299 <li><tt>sigsetjmp</tt>, <tt>siglongjmp</tt> - These are not turned into the
300 appropriate <tt>invoke</tt>/<tt>unwind</tt> instructions. Note that
301 <tt>setjmp</tt> and <tt>longjmp</tt> <em>are</em> compiled correctly.
302 <li><tt>getcontext</tt>, <tt>setcontext</tt>, <tt>makecontext</tt>
303 - These functions have not been tested.
304 </ol></li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]305
306<li>Although many GCC extensions are supported, some are not. In particular,
307 the following extensions are known to <b>not be</b> supported:
308 <ol>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]309 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Local-Labels.html#Local%20Labels">Local Labels</a>: Labels local to a block.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]310 <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>
311 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Constructing-Calls.html#Constructing%20Calls">Constructing Calls</a>: Dispatching a call to another function.</li>
312 <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 Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]313 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Constraints.html#Constraints">Constraints</a>: Constraints for asm operands.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]314 <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>
315 <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 Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]316 <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>
317 <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>
318 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Thread-Local.html#Thread-Local">Thread-Local</a>: Per-thread variables.</li>
319 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Pragmas.html#Pragmas">Pragmas</a>: Pragmas accepted by GCC.</li>
Misha Brukman7cb4e382003-11-22 01:00:11 +0000[diff] [blame]320 </ol>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]321
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]322 <p>The following GCC extensions are <b>partially</b> supported. An ignored
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]323 attribute means that the LLVM compiler ignores the presence of the attribute,
324 but the code should still work. An unsupported attribute is one which is
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]325 ignored by the LLVM compiler and will cause a different interpretation of
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]326 the program.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]327
328 <ol>
329 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Length.html#Variable%20Length">Variable Length</a>:
330 Arrays whose length is computed at run time.<br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]331 Supported, but allocated stack space is not freed until the function returns (noted above).</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]332
333 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html#Function%20Attributes">Function Attributes</a>:
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]334
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]335 Declaring that functions have no side effects or that they can never
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]336 return.<br>
337
338 <b>Supported:</b> <tt>format</tt>, <tt>format_arg</tt>, <tt>non_null</tt>,
339 <tt>constructor</tt>, <tt>destructor</tt>, <tt>unused</tt>,
340 <tt>deprecated</tt>, <tt>warn_unused_result</tt>, <tt>weak</tt><br>
341
342 <b>Ignored:</b> <tt>noreturn</tt>, <tt>noinline</tt>,
343 <tt>always_inline</tt>, <tt>pure</tt>, <tt>const</tt>, <tt>nothrow</tt>,
344 <tt>malloc</tt>, <tt>no_instrument_function</tt>, <tt>cdecl</tt><br>
345
346 <b>Unsupported:</b> <tt>used</tt>, <tt>section</tt>, <tt>alias</tt>,
347 <tt>visibility</tt>, <tt>regparm</tt>, <tt>stdcall</tt>,
348 <tt>fastcall</tt>, all other target specific attributes</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]349
350 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Attributes.html#Variable%20Attributes">Variable Attributes</a>:
351 Specifying attributes of variables.<br>
352 <b>Supported:</b> <tt>cleanup</tt>, <tt>common</tt>, <tt>nocommon</tt>,
353 <tt>deprecated</tt>, <tt>transparent_union</tt>,
354 <tt>unused</tt>, <tt>weak</tt><br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]355
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]356 <b>Unsupported:</b> <tt>aligned</tt>, <tt>mode</tt>, <tt>packed</tt>,
357 <tt>section</tt>, <tt>shared</tt>, <tt>tls_model</tt>,
358 <tt>vector_size</tt>, <tt>dllimport</tt>,
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]359 <tt>dllexport</tt>, all target specific attributes.</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]360
Misha Brukman8395d732003-12-12 04:37:31 +0000[diff] [blame]361 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Type-Attributes.html#Type%20Attributes">Type Attributes</a>: Specifying attributes of types.<br>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]362 <b>Supported:</b> <tt>transparent_union</tt>, <tt>unused</tt>,
Misha Brukman8395d732003-12-12 04:37:31 +0000[diff] [blame]363 <tt>deprecated</tt>, <tt>may_alias</tt><br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]364
365 <b>Unsupported:</b> <tt>aligned</tt>, <tt>packed</tt>,
366 all target specific attributes.</li>
367
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]368 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html#Other%20Builtins">Other Builtins</a>:
369 Other built-in functions.<br>
370 We support all builtins which have a C language equivalent (e.g.,
371 <tt>__builtin_cos</tt>), <tt>__builtin_alloca</tt>,
372 <tt>__builtin_types_compatible_p</tt>, <tt>__builtin_choose_expr</tt>,
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]373 <tt>__builtin_constant_p</tt>, and <tt>__builtin_expect</tt> (ignored).</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]374
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]375 </ol>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]376
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]377 <p>The following extensions <b>are</b> known to be supported:</p>
378
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]379 <ol>
Chris Lattnerd3dc8502004-03-16 08:54:07 +0000[diff] [blame]380 <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 Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]381 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html#Statement%20Exprs">Statement Exprs</a>: Putting statements and declarations inside expressions.</li>
382 <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>
383 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Lvalues.html#Lvalues">Lvalues</a>: Using <code>?:</code>, "<code>,</code>" and casts in lvalues.</li>
384 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Conditionals.html#Conditionals">Conditionals</a>: Omitting the middle operand of a <code>?:</code> expression.</li>
385 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Long-Long.html#Long%20Long">Long Long</a>: Double-word integers.</li>
386 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Complex.html#Complex">Complex</a>: Data types for complex numbers.</li>
387 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Hex-Floats.html#Hex%20Floats">Hex Floats</a>:Hexadecimal floating-point constants.</li>
388 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html#Zero%20Length">Zero Length</a>: Zero-length arrays.</li>
389 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Empty-Structures.html#Empty%20Structures">Empty Structures</a>: Structures with no members.</li>
390 <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>
391 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Escaped-Newlines.html#Escaped%20Newlines">Escaped Newlines</a>: Slightly looser rules for escaped newlines.</li>
392 <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 Brukman8395d732003-12-12 04:37:31 +0000[diff] [blame]393 <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 Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]394 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Initializers.html#Initializers">Initializers</a>: Non-constant initializers.</li>
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]395 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Compound-Literals.html#Compound%20Literals">Compound Literals</a>: Compound literals give structures, unions,
396or arrays as values.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]397 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Designated-Inits.html#Designated%20Inits">Designated Inits</a>: Labeling elements of initializers.</li>
Misha Brukman8395d732003-12-12 04:37:31 +0000[diff] [blame]398 <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 Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]399 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Case-Ranges.html#Case%20Ranges">Case Ranges</a>: `case 1 ... 9' and such.</li>
400 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Mixed-Declarations.html#Mixed%20Declarations">Mixed Declarations</a>: Mixing declarations and code.</li>
401 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Function-Prototypes.html#Function%20Prototypes">Function Prototypes</a>: Prototype declarations and old-style definitions.</li>
402 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/C---Comments.html#C++%20Comments">C++ Comments</a>: C++ comments are recognized.</li>
403 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Dollar-Signs.html#Dollar%20Signs">Dollar Signs</a>: Dollar sign is allowed in identifiers.</li>
404 <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>
405 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Alignment.html#Alignment">Alignment</a>: Inquiring about the alignment of a type or variable.</li>
406 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Inline.html#Inline">Inline</a>: Defining inline functions (as fast as macros).</li>
407 <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>
408 <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>
409 <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 Lattner3646dad2004-02-14 04:08:29 +0000[diff] [blame]410 <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 Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]411 <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>
412 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Attribute-Syntax.html#Attribute%20Syntax">Attribute Syntax</a>: Formal syntax for attributes.</li>
Misha Brukman7cb4e382003-11-22 01:00:11 +0000[diff] [blame]413 </ol></li>
414
415</ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]416
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]417<p>If you run into GCC extensions which have not been included in any of these
418lists, please let us know (also including whether or not they work).</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]419
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]420</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]421
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]422<!-- ======================================================================= -->
423<div class="doc_subsection">
424 <a name="c++-fe">Known problems with the C++ front-end</a>
425</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]426
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]427<div class="doc_text">
428
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]429<p>For this release, the C++ front-end is considered to be fully functional but
Chris Lattnere76e9ab2003-12-12 04:25:33 +0000[diff] [blame]430has not been tested as thoroughly as the C front-end. It has been tested and
431works for a number of non-trivial programs, but there may be lurking bugs.
432Please report any bugs or problems.</p>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]433
434</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]435
436<!-- _______________________________________________________________________ -->
Chris Lattner141ebb62004-02-14 04:12:41 +0000[diff] [blame]437<div class="doc_subsubsection">Bugs</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]438
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]439<div class="doc_text">
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]440
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]441<ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]442<li>The C++ front-end inherits all problems afflicting the <a href="#c-fe">C
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]443 front-end</a>.</li>
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]444</ul>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]445</div>
446
447<!-- _______________________________________________________________________ -->
448<div class="doc_subsubsection">
449 Notes
450</div>
451
452<div class="doc_text">
453
454<ul>
Chris Lattnerd2a74272003-10-27 18:30:37 +0000[diff] [blame]455
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]456<li>The C++ front-end is based on a pre-release of the GCC 3.4 C++ parser. This
457parser is significantly more standards compliant (and picky) than prior GCC
458versions. For more information, see the C++ section of the <a
Chris Lattnere76e9ab2003-12-12 04:25:33 +0000[diff] [blame]459href="http://gcc.gnu.org/gcc-3.4/changes.html">GCC 3.4 release notes</a>.</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]460
461<li>Destructors for local objects are not always run when a <tt>longjmp</tt> is
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]462 performed. In particular, destructors for objects in the <tt>longjmp</tt>ing
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]463 function and in the <tt>setjmp</tt> receiver function may not be run.
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]464 Objects in intervening stack frames will be destroyed, however (which is
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]465 better than most compilers).</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]466
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]467<li>The LLVM C++ front-end follows the <a
468 href="http://www.codesourcery.com/cxx-abi">Itanium C++ ABI</a>.
469 This document, which is not Itanium specific, specifies a standard for name
470 mangling, class layout, v-table layout, RTTI formats, and other C++
471 representation issues. Because we use this API, code generated by the LLVM
472 compilers should be binary compatible with machine code generated by other
473 Itanium ABI C++ compilers (such as G++, the Intel and HP compilers, etc).
474 <i>However</i>, the exception handling mechanism used by LLVM is very
475 different from the model used in the Itanium ABI, so <b>exceptions will not
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]476 interact correctly</b>. </li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]477
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]478</ul>
Chris Lattner46ecf612003-10-07 22:14:37 +0000[diff] [blame]479
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]480</div>
481
482<!-- ======================================================================= -->
483<div class="doc_subsection">
484 <a name="x86-be">Known problems with the X86 back-end</a>
485</div>
486
487<div class="doc_text">
488
489<ul>
Chris Lattnerc5b7b242004-02-08 22:23:33 +0000[diff] [blame]490<li>None so far.
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]491</ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]492
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]493</div>
494
495<!-- ======================================================================= -->
496<div class="doc_subsection">
497 <a name="sparc-be">Known problems with the Sparc back-end</a>
498</div>
499
500<div class="doc_text">
501
502<ul>
Chris Lattner9e0b81c2004-03-19 19:22:28 +0000[diff] [blame]503<li>There are several programs in the LLVM testsuite that the Sparc code generator is known to miscompile.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]504</ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]505
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]506</div>
507
508<!-- ======================================================================= -->
509<div class="doc_subsection">
510 <a name="c-be">Known problems with the C back-end</a>
511</div>
512
513<div class="doc_text">
514
515<ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]516
517<li>The C back-end produces code that violates the ANSI C Type-Based Alias
518Analysis rules. As such, special options may be necessary to compile the code
519(for example, GCC requires the <tt>-fno-strict-aliasing</tt> option). This
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]520problem probably cannot be fixed.</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]521
Chris Lattnera623e482003-10-20 19:05:03 +0000[diff] [blame]522<li><a href="http://llvm.cs.uiuc.edu/PR33">Initializers for global variables</a>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]523cannot include special floating point numbers like Not-A-Number or
524Infinity.</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]525
Chris Lattnerc679fbb2003-11-04 20:06:53 +0000[diff] [blame]526<li><a href="http://llvm.cs.uiuc.edu/PR56">Zero arg vararg functions are not
Chris Lattnerb28c3282003-10-24 04:03:19 +0000[diff] [blame]527supported</a>. This should not affect LLVM produced by the C or C++
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]528frontends.</li>
Chris Lattnerb28c3282003-10-24 04:03:19 +0000[diff] [blame]529
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]530</ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]531
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]532</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]533
534<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]535<div class="doc_section">
536 <a name="additionalinfo">Additional Information</a>
537</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]538<!-- *********************************************************************** -->
539
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]540<div class="doc_text">
541
542<p>A wide variety of additional information is available on the LLVM web page,
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]543including mailing lists and publications describing algorithms and components
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]544implemented in LLVM. The web page also contains versions of the API
545documentation which is up-to-date with the CVS version of the source code. You
546can access versions of these documents specific to this release by going into
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]547the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]548
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]549<p>If you have any questions or comments about LLVM, please feel free to contact
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]550us via the <a href="http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev">mailing
551lists</a>.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]552
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]553</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]554
555<!-- *********************************************************************** -->
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]556
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]557<hr>
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]558<address>
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