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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>
Chris Lattner4b538b92004-04-30 22:17:12 +0000[diff] [blame]15 <li><a href="GettingStarted.html">Installation Instructions</a></li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]16 <li><a href="#portability">Portability and Supported Platforms</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 Lattnerd4594dc2004-05-04 17:04:09 +0000[diff] [blame]73This is the fourth public release of the LLVM compiler infrastructure. This
74release primarily improves the <a href="#codequality">performance of the
75code</a> produced by all aspects of the LLVM compiler and adds some <a
76href="#newfeatures">new features</a>, though it does <a href="#bugfix">fix a few
77bugs</a> as well.
Chris Lattnerb40efb32003-12-14 05:03:43 +0000[diff] [blame]78</p>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]79
Chris Lattner835104c2004-03-17 03:54:41 +0000[diff] [blame]80<p>
81At this time, LLVM is known to correctly compile and run all C &amp; C++ SPEC
82CPU2000 benchmarks, the Olden benchmarks, and the Ptrdist benchmarks. It has
83also been used to compile <b>many</b> other programs. LLVM now also works with
84a broad variety of C++ programs, though it has still received less testing than
85the C front-end.
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]86</p>
87
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]88<!--=========================================================================-->
89<div class="doc_subsubsection">
Chris Lattnera39719f2004-02-25 16:36:51 +0000[diff] [blame]90<a name="newfeatures">This release implements the following new features:</a>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]91</div>
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]92
93<ol>
Chris Lattner2974b5b2004-04-01 00:41:31 +0000[diff] [blame]94<li>The LLVM <a href="LangRef.html#i_select"><tt>select</tt></a> instruction is
Chris Lattner6e1ef192004-05-02 04:19:15 +0000[diff] [blame]95now fully implemented and supported by all transformations, native code
96generators, and the interpreter.</li>
Misha Brukmana7aadf12004-04-19 02:56:49 +0000[diff] [blame]97<li>Bugpoint can now narrow down code-generation bugs to a loop nest, where
98before it could only narrow them down to a function being miscompiled.</li>
Brian Gaeke43be3112004-05-04 21:22:57 +0000[diff] [blame]99<li><a href="http://llvm.cs.uiuc.edu/PR40">Bugpoint can now debug arbitrary
100modes of llc</a> and lli, by passing them command line flags (e.g.,
101<tt>-regalloc=linearscan</tt>, <tt>-enable-correct-eh-support</tt>, etc.) </li>
Chris Lattner6e1ef192004-05-02 04:19:15 +0000[diff] [blame]102<li>The Control Flow Graph in the native code generators is no longer
103constrained to be the same as the CFG for the LLVM input code.</li>
104<li>The LLVM induction variable analysis routines have been rewritten.</li>
105<li>LLVM now has new loop unrolling and loop unswitching passes.</li>
106<li>The induction variable substitution pass performs linear function test
107replacement and exit value replacement optimizations.</li>
Chris Lattner55ee0312003-11-19 22:05:38 +0000[diff] [blame]108</ol>
Chris Lattner0ef19062003-11-08 04:28:55 +0000[diff] [blame]109
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]110
111<!--=========================================================================-->
112<div class="doc_subsubsection">
113In this release, the following missing features were implemented:
114</div>
Chris Lattner0ef19062003-11-08 04:28:55 +0000[diff] [blame]115
116<ol>
Misha Brukmana7aadf12004-04-19 02:56:49 +0000[diff] [blame]117<li><a href="http://llvm.cs.uiuc.edu/PR82">LLVM cannot handle structures with
118more than 256 elements</a></li>
Misha Brukmancb003362004-04-19 03:01:01 +0000[diff] [blame]119<li><a href="http://llvm.cs.uiuc.edu/PR38">[bugpoint] External functions used in
120non-instruction entities, such as global constant initializer</a></li>
121<li><a href="http://llvm.cs.uiuc.edu/PR290">Bugpoint doesn't support
122uses of external fns by immediate constant exprs</a></li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]123</ol>
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]124
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]125
126<!--=========================================================================-->
127<div class="doc_subsubsection">
Misha Brukmana7aadf12004-04-19 02:56:49 +0000[diff] [blame]128<a name="qualityofimp">In this release, the following Quality of Implementation
129issues were fixed:</a>
Chris Lattnere29ac162003-12-20 03:42:11 +0000[diff] [blame]130</div>
131
132<ol>
Misha Brukmana7aadf12004-04-19 02:56:49 +0000[diff] [blame]133<li><a href="http://llvm.cs.uiuc.edu/PR305">LLVM tools will happily spew
134bytecode onto your terminal</a></li>
Chris Lattneradd68af2004-05-07 19:23:05 +0000[diff] [blame^]135<li><a href="http://llvm.cs.uiuc.edu/PR329">[llvmgcc] type names are not emitted for structure typedefs</a></li>
Chris Lattnere29ac162003-12-20 03:42:11 +0000[diff] [blame]136</ol>
137
138<!--=========================================================================-->
139<div class="doc_subsubsection">
Chris Lattnera39719f2004-02-25 16:36:51 +0000[diff] [blame]140In this release, the following build problems were fixed:
Brian Gaeke6b31beb2004-01-16 21:55:04 +0000[diff] [blame]141</div>
142
143<ol>
Brian Gaeke21a710a2004-04-20 18:18:46 +0000[diff] [blame]144<li><a href="http://llvm.cs.uiuc.edu/PR301">Minor configure bugs with -disable/enable-povray and -disable-spec</a></li>
Brian Gaeke6b31beb2004-01-16 21:55:04 +0000[diff] [blame]145</ol>
146
147<!--=========================================================================-->
148<div class="doc_subsubsection">
Chris Lattner6e1ef192004-05-02 04:19:15 +0000[diff] [blame]149<a name="codequality">This release includes the following Code Quality
150improvements:</a>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]151</div>
Chris Lattner89ca2b82003-10-27 17:06:39 +0000[diff] [blame]152
153<ol>
Chris Lattner6e1ef192004-05-02 04:19:15 +0000[diff] [blame]154<li>Fixed: <a href="http://llvm.cs.uiuc.edu/PR309">[vmcore] Code quality problem
155due to long operand of getelementptr</a></li>
Chris Lattner64913402004-04-13 14:43:35 +0000[diff] [blame]156
157<li>The X86 backend now generates substantially better code for 64-bit integer
158and floating point operations.</li>
159
160<li>The -inline pass no longer inlines mutually recursive functions until it
161hits the inlining threshold.</li>
162
163<li>The -inline pass no longer misses obvious inlining opportunities just
164because the callee eventually calls into an external function.</li>
165
166<li>The -simplifycfg pass can now "if convert" simple statements into the new
167<tt>select</tt> instruction.</li>
168
169<li>The -loopsimplify pass can now break <a
170href="http://llvm.cs.uiuc.edu/PR35">natural loops with multiple backedges</a>
171into multiple nested loops. This enables a variety of subsequent
172optimizations.</li>
173
174<li>The -adce pass can now eliminate calls to functions that do not not write to
175memory.</li>
176
177<li>The link-time optimizer now runs the -prune-eh pass (to remove unused
Chris Lattnerd4594dc2004-05-04 17:04:09 +0000[diff] [blame]178exception handlers).</li>
Chris Lattner64913402004-04-13 14:43:35 +0000[diff] [blame]179
Chris Lattner6e1ef192004-05-02 04:19:15 +0000[diff] [blame]180<li>The -simplifycfg pass can now eliminate simple correlated branches (such as
181"<tt>if (A &lt; B &amp;&amp; A &lt; B)</tt>", and can turn short-circuiting
182operators into the strict versions when useful (such as "<tt>if (A &lt; B || A
183&gt; C)</tt>" into "<tt>if (A &lt; B | A &gt; C)</tt>"</li>
184
Chris Lattnerd4594dc2004-05-04 17:04:09 +0000[diff] [blame]185<li>LLVM now has infrastructure for (simple and sparse conditional) constant
186propagation of function calls. It currently supports a few math library
187functions like sqrt/sin/cos/etc.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]188</ol>
Chris Lattner89ca2b82003-10-27 17:06:39 +0000[diff] [blame]189
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]190
191<!--=========================================================================-->
192<div class="doc_subsubsection">
Misha Brukmana7aadf12004-04-19 02:56:49 +0000[diff] [blame]193<a name="bugfix">In this release, the following bugs in the previous release
194were fixed:</a>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]195</div>
196
197<p>Bugs in the LLVM Core:</p>
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]198
199<ol>
John Criswell4d8d49f2004-05-06 22:23:24 +0000[diff] [blame]200<li><a href="http://llvm.cs.uiuc.edu/PR330">[vmcore] Linker causes erroneous
201asssertion</a></li>
Misha Brukmana7aadf12004-04-19 02:56:49 +0000[diff] [blame]202<li><a href="http://llvm.cs.uiuc.edu/PR306">[loopsimplify] Loop simplify
203incorrectly updates dominator information</a></li>
204<li><a href="http://llvm.cs.uiuc.edu/PR310">[tailduplicate] DemoteRegToStack
205breaks SSA form</a></li>
206<li><a href="http://llvm.cs.uiuc.edu/PR313">[X86] JIT miscompiles unsigned short
207to floating point cast</a></li>
Chris Lattnerd4594dc2004-05-04 17:04:09 +0000[diff] [blame]208<li><a href="http://llvm.cs.uiuc.edu/PR332">[adce] Crash handling unreachable code that unwinds</a></li>
Brian Gaeke43be3112004-05-04 21:22:57 +0000[diff] [blame]209<li><a href="http://llvm.cs.uiuc.edu/PR333">[sparc] LLC can't emit 2 functions of
210the same name, both having constant pools</a></li>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]211</ol>
212
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]213<p>Bugs in the C/C++ front-end:</p>
214
215<ol>
Chris Lattner581dc802004-05-07 18:40:38 +0000[diff] [blame]216<li><a href="http://llvm.cs.uiuc.edu/PR326">[llvmgcc] Crash on use of undeclared enum type</a></li>
217<li><a href="http://llvm.cs.uiuc.edu/PR298">[llvmgcc] Variable length array indexing miscompiled</a></li>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]218</ol>
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]219
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]220</div>
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]221
222<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]223<div class="doc_section">
224 <a name="portability">Portability and Supported Platforms</a>
225</div>
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]226<!-- *********************************************************************** -->
227
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]228<div class="doc_text">
229
230<p>LLVM has been extensively tested on Intel and AMD machines running Red
Misha Brukmana7aadf12004-04-19 02:56:49 +0000[diff] [blame]231Hat Linux and FreeBSD. It has also been tested on Sun UltraSPARC workstations
232running Solaris 8. Additionally, LLVM works on Mac OS X 10.3 and above, but
233only with the C backend or interpreter (no native backend for the PowerPC is
234available yet). The core LLVM infrastructure uses "autoconf" for portability,
235so hopefully we work on more platforms than that. However, it is likely that we
236missed something and that minor porting is required to get LLVM to work on new
237platforms. We welcome portability patches and error messages.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]238
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]239</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]240
Brian Gaeke21a710a2004-04-20 18:18:46 +0000[diff] [blame]241<!--=========================================================================-->
242<div class="doc_subsection">
243In this release, the following portability problems were fixed:
244</div>
245
246<ol>
247<li><a href="http://llvm.cs.uiuc.edu/PR304">warnings compiling Stacker compiler on Mac OS X</a></li>
Chris Lattnerd4594dc2004-05-04 17:04:09 +0000[diff] [blame]248<li><a href="http://llvm.cs.uiuc.edu/PR308">Archive file reader doesn't understand abbreviated names in headers</a></li>
Brian Gaeke21a710a2004-04-20 18:18:46 +0000[diff] [blame]249</ol>
250
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]251<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]252<div class="doc_section">
253 <a name="knownproblems">Known Problems</a>
254</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]255<!-- *********************************************************************** -->
256
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]257<div class="doc_text">
258
259<p>This section contains all known problems with the LLVM system, listed by
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]260component. As new problems are discovered, they will be added to these
Chris Lattner5eccca42003-12-12 21:22:16 +0000[diff] [blame]261sections. If you run into a problem, please check the <a
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]262href="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]263there isn't already one.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]264
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]265</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]266
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]267<!-- ======================================================================= -->
268<div class="doc_subsection">
269 <a name="experimental">Experimental features included with this release</a>
270</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]271
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]272<div class="doc_text">
273
274<p>
275The following components of this LLVM release are either untested, known to be
276broken or unreliable, or are in early development. These components should not
277be relied on, and bugs should not be filed against them, but they may be useful
278to some people. In particular, if you would like to work on one of these
279components, please contact us on the llvmdev list.
280</p>
281
282<ul>
283<li>The following passes are incomplete or buggy: <tt>-pgmdep, -memdep,
284 -ipmodref, -sortstructs, -swapstructs, -cee</tt></li>
285
286<li>The <tt>-pre</tt> pass is incomplete (there are cases it doesn't handle that
287 it should) and not thoroughly tested.</li>
288<li>The <tt>llvm-ar</tt> tool is incomplete and probably buggy.</li>
289<li>The <tt>llvm-db</tt> tool is in a very early stage of development.</li>
290</ul>
291
292</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]293
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]294<!-- ======================================================================= -->
295<div class="doc_subsection">
296 <a name="core">Known problems with the LLVM Core</a>
297</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]298
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]299<div class="doc_text">
300
301<ul>
302
303<li>In the JIT, <tt>dlsym</tt> on a symbol compiled by the JIT will not
304work.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]305
306<li>The JIT does not use mutexes to protect its internal data structures. As
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]307such, execution of a threaded program could cause these data structures to be
308corrupted.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]309
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]310<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]311
Chris Lattnere84843b2003-10-20 19:05:03 +0000[diff] [blame]312<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]313table in the archive).</li>
Chris Lattner2855ecd2003-11-04 20:06:53 +0000[diff] [blame]314
Misha Brukmana7aadf12004-04-19 02:56:49 +0000[diff] [blame]315<li>The gccld program <a href="http://llvm.cs.uiuc.edu/PR139">does not link
316objects/archives in the order specified on the command line.</a></li>
Chris Lattner2e6fcaf2004-02-15 23:09:07 +0000[diff] [blame]317
318<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]319values live across a setjmp as volatile</a>. This missing feature only affects
Chris Lattner2e6fcaf2004-02-15 23:09:07 +0000[diff] [blame]320targets whose setjmp/longjmp libraries do not save and restore the entire
321register file.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]322</ul>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]323</div>
324
325<!-- ======================================================================= -->
326<div class="doc_subsection">
327 <a name="c-fe">Known problems with the C front-end</a>
328</div>
Chris Lattner47588f92003-10-02 05:07:23 +0000[diff] [blame]329
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]330<!-- _______________________________________________________________________ -->
Chris Lattnerb40efb32003-12-14 05:03:43 +0000[diff] [blame]331<div class="doc_subsubsection">Bugs</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]332
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]333<div class="doc_text">
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]334<ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]335<li>C99 Variable sized arrays do not release stack memory when they go out of
336 scope. Thus, the following program may run out of stack space:
337<pre>
338 for (i = 0; i != 1000000; ++i) {
339 int X[n];
340 foo(X);
341 }
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]342</pre></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]343
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]344<li>
345Initialization of global union variables can only be done
346<a href="http://llvm.cs.uiuc.edu/bugs/show_bug.cgi?id=162">with the largest
347union member</a>.
348</li>
Chris Lattnerf580cdc2004-03-16 21:39:04 +0000[diff] [blame]349
Misha Brukmana7aadf12004-04-19 02:56:49 +0000[diff] [blame]350<li><a href="http://llvm.cs.uiuc.edu/PR244">[llvm-gcc] Error when an implicitly
351external function is re-declared as static</a></li>
Chris Lattnerf580cdc2004-03-16 21:39:04 +0000[diff] [blame]352
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]353</ul>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]354</div>
355
356<!-- _______________________________________________________________________ -->
357<div class="doc_subsubsection">
358 Notes
359</div>
360
361<div class="doc_text">
362
363<ul>
364
365<li>Inline assembly is not yet supported.</li>
Chris Lattnere01fcfb2003-10-27 18:30:37 +0000[diff] [blame]366
367<li>"long double" is transformed by the front-end into "double". There is no
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]368support for floating point data types of any size other than 32 and 64
369bits.</li>
370
371<li>The following Unix system functionality has not been tested and may not
372work:
Misha Brukmane0c891c2003-11-22 01:00:11 +0000[diff] [blame]373 <ol>
374 <li><tt>sigsetjmp</tt>, <tt>siglongjmp</tt> - These are not turned into the
375 appropriate <tt>invoke</tt>/<tt>unwind</tt> instructions. Note that
376 <tt>setjmp</tt> and <tt>longjmp</tt> <em>are</em> compiled correctly.
377 <li><tt>getcontext</tt>, <tt>setcontext</tt>, <tt>makecontext</tt>
378 - These functions have not been tested.
379 </ol></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]380
381<li>Although many GCC extensions are supported, some are not. In particular,
382 the following extensions are known to <b>not be</b> supported:
383 <ol>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]384 <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]385 <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>
386 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Constructing-Calls.html#Constructing%20Calls">Constructing Calls</a>: Dispatching a call to another function.</li>
387 <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]388 <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]389 <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>
390 <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]391 <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>
392 <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>
393 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Thread-Local.html#Thread-Local">Thread-Local</a>: Per-thread variables.</li>
394 <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]395 </ol>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]396
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]397 <p>The following GCC extensions are <b>partially</b> supported. An ignored
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]398 attribute means that the LLVM compiler ignores the presence of the attribute,
399 but the code should still work. An unsupported attribute is one which is
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]400 ignored by the LLVM compiler and will cause a different interpretation of
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]401 the program.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]402
403 <ol>
404 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Length.html#Variable%20Length">Variable Length</a>:
405 Arrays whose length is computed at run time.<br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]406 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]407
408 <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]409
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]410 Declaring that functions have no side effects or that they can never
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]411 return.<br>
412
413 <b>Supported:</b> <tt>format</tt>, <tt>format_arg</tt>, <tt>non_null</tt>,
414 <tt>constructor</tt>, <tt>destructor</tt>, <tt>unused</tt>,
415 <tt>deprecated</tt>, <tt>warn_unused_result</tt>, <tt>weak</tt><br>
416
417 <b>Ignored:</b> <tt>noreturn</tt>, <tt>noinline</tt>,
418 <tt>always_inline</tt>, <tt>pure</tt>, <tt>const</tt>, <tt>nothrow</tt>,
419 <tt>malloc</tt>, <tt>no_instrument_function</tt>, <tt>cdecl</tt><br>
420
421 <b>Unsupported:</b> <tt>used</tt>, <tt>section</tt>, <tt>alias</tt>,
422 <tt>visibility</tt>, <tt>regparm</tt>, <tt>stdcall</tt>,
423 <tt>fastcall</tt>, all other target specific attributes</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]424
425 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Attributes.html#Variable%20Attributes">Variable Attributes</a>:
426 Specifying attributes of variables.<br>
427 <b>Supported:</b> <tt>cleanup</tt>, <tt>common</tt>, <tt>nocommon</tt>,
428 <tt>deprecated</tt>, <tt>transparent_union</tt>,
429 <tt>unused</tt>, <tt>weak</tt><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]430
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]431 <b>Unsupported:</b> <tt>aligned</tt>, <tt>mode</tt>, <tt>packed</tt>,
432 <tt>section</tt>, <tt>shared</tt>, <tt>tls_model</tt>,
433 <tt>vector_size</tt>, <tt>dllimport</tt>,
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]434 <tt>dllexport</tt>, all target specific attributes.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]435
Misha Brukmanc4b7bee2003-12-12 04:37:31 +0000[diff] [blame]436 <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]437 <b>Supported:</b> <tt>transparent_union</tt>, <tt>unused</tt>,
Misha Brukmanc4b7bee2003-12-12 04:37:31 +0000[diff] [blame]438 <tt>deprecated</tt>, <tt>may_alias</tt><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]439
440 <b>Unsupported:</b> <tt>aligned</tt>, <tt>packed</tt>,
441 all target specific attributes.</li>
442
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]443 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html#Other%20Builtins">Other Builtins</a>:
444 Other built-in functions.<br>
445 We support all builtins which have a C language equivalent (e.g.,
446 <tt>__builtin_cos</tt>), <tt>__builtin_alloca</tt>,
447 <tt>__builtin_types_compatible_p</tt>, <tt>__builtin_choose_expr</tt>,
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]448 <tt>__builtin_constant_p</tt>, and <tt>__builtin_expect</tt> (ignored).</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]449
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]450 </ol>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]451
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]452 <p>The following extensions <b>are</b> known to be supported:</p>
453
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]454 <ol>
Chris Lattner7fe97dd2004-03-16 08:54:07 +0000[diff] [blame]455 <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]456 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html#Statement%20Exprs">Statement Exprs</a>: Putting statements and declarations inside expressions.</li>
457 <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>
458 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Lvalues.html#Lvalues">Lvalues</a>: Using <code>?:</code>, "<code>,</code>" and casts in lvalues.</li>
459 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Conditionals.html#Conditionals">Conditionals</a>: Omitting the middle operand of a <code>?:</code> expression.</li>
460 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Long-Long.html#Long%20Long">Long Long</a>: Double-word integers.</li>
461 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Complex.html#Complex">Complex</a>: Data types for complex numbers.</li>
462 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Hex-Floats.html#Hex%20Floats">Hex Floats</a>:Hexadecimal floating-point constants.</li>
463 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html#Zero%20Length">Zero Length</a>: Zero-length arrays.</li>
464 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Empty-Structures.html#Empty%20Structures">Empty Structures</a>: Structures with no members.</li>
465 <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>
466 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Escaped-Newlines.html#Escaped%20Newlines">Escaped Newlines</a>: Slightly looser rules for escaped newlines.</li>
467 <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]468 <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]469 <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]470 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Compound-Literals.html#Compound%20Literals">Compound Literals</a>: Compound literals give structures, unions,
471or arrays as values.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]472 <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]473 <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]474 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Case-Ranges.html#Case%20Ranges">Case Ranges</a>: `case 1 ... 9' and such.</li>
475 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Mixed-Declarations.html#Mixed%20Declarations">Mixed Declarations</a>: Mixing declarations and code.</li>
476 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Function-Prototypes.html#Function%20Prototypes">Function Prototypes</a>: Prototype declarations and old-style definitions.</li>
477 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/C---Comments.html#C++%20Comments">C++ Comments</a>: C++ comments are recognized.</li>
478 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Dollar-Signs.html#Dollar%20Signs">Dollar Signs</a>: Dollar sign is allowed in identifiers.</li>
479 <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>
480 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Alignment.html#Alignment">Alignment</a>: Inquiring about the alignment of a type or variable.</li>
481 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Inline.html#Inline">Inline</a>: Defining inline functions (as fast as macros).</li>
482 <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>
483 <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>
484 <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]485 <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]486 <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>
487 <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]488 </ol></li>
489
490</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]491
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]492<p>If you run into GCC extensions which have not been included in any of these
493lists, please let us know (also including whether or not they work).</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]494
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]495</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]496
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]497<!-- ======================================================================= -->
498<div class="doc_subsection">
499 <a name="c++-fe">Known problems with the C++ front-end</a>
500</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]501
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]502<div class="doc_text">
503
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]504<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]505has not been tested as thoroughly as the C front-end. It has been tested and
506works for a number of non-trivial programs, but there may be lurking bugs.
507Please report any bugs or problems.</p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]508
509</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]510
511<!-- _______________________________________________________________________ -->
Chris Lattner3a51be12004-02-14 04:12:41 +0000[diff] [blame]512<div class="doc_subsubsection">Bugs</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]513
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]514<div class="doc_text">
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]515
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]516<ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]517<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]518 front-end</a>.</li>
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]519</ul>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]520</div>
521
522<!-- _______________________________________________________________________ -->
523<div class="doc_subsubsection">
524 Notes
525</div>
526
527<div class="doc_text">
528
529<ul>
Chris Lattnere01fcfb2003-10-27 18:30:37 +0000[diff] [blame]530
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]531<li>The C++ front-end is based on a pre-release of the GCC 3.4 C++ parser. This
532parser is significantly more standards compliant (and picky) than prior GCC
533versions. For more information, see the C++ section of the <a
Chris Lattner9e848092003-12-12 04:25:33 +0000[diff] [blame]534href="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]535
536<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]537 performed. In particular, destructors for objects in the <tt>longjmp</tt>ing
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]538 function and in the <tt>setjmp</tt> receiver function may not be run.
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]539 Objects in intervening stack frames will be destroyed, however (which is
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]540 better than most compilers).</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]541
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]542<li>The LLVM C++ front-end follows the <a
543 href="http://www.codesourcery.com/cxx-abi">Itanium C++ ABI</a>.
544 This document, which is not Itanium specific, specifies a standard for name
545 mangling, class layout, v-table layout, RTTI formats, and other C++
546 representation issues. Because we use this API, code generated by the LLVM
547 compilers should be binary compatible with machine code generated by other
548 Itanium ABI C++ compilers (such as G++, the Intel and HP compilers, etc).
549 <i>However</i>, the exception handling mechanism used by LLVM is very
550 different from the model used in the Itanium ABI, so <b>exceptions will not
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]551 interact correctly</b>. </li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]552
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]553</ul>
Chris Lattnerfcc54b32003-10-07 22:14:37 +0000[diff] [blame]554
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]555</div>
556
557<!-- ======================================================================= -->
558<div class="doc_subsection">
559 <a name="x86-be">Known problems with the X86 back-end</a>
560</div>
561
562<div class="doc_text">
563
564<ul>
Chris Lattnerde4afdc2004-02-08 22:23:33 +0000[diff] [blame]565<li>None so far.
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]566</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]567
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]568</div>
569
570<!-- ======================================================================= -->
571<div class="doc_subsection">
572 <a name="sparc-be">Known problems with the Sparc back-end</a>
573</div>
574
575<div class="doc_text">
576
577<ul>
Chris Lattner6a39aa52004-03-19 19:22:28 +0000[diff] [blame]578<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]579</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]580
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]581</div>
582
583<!-- ======================================================================= -->
584<div class="doc_subsection">
585 <a name="c-be">Known problems with the C back-end</a>
586</div>
587
588<div class="doc_text">
589
590<ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]591
592<li>The C back-end produces code that violates the ANSI C Type-Based Alias
593Analysis rules. As such, special options may be necessary to compile the code
594(for example, GCC requires the <tt>-fno-strict-aliasing</tt> option). This
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]595problem probably cannot be fixed.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]596
Chris Lattnere84843b2003-10-20 19:05:03 +0000[diff] [blame]597<li><a href="http://llvm.cs.uiuc.edu/PR33">Initializers for global variables</a>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]598cannot include special floating point numbers like Not-A-Number or
599Infinity.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]600
Chris Lattner2855ecd2003-11-04 20:06:53 +0000[diff] [blame]601<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]602supported</a>. This should not affect LLVM produced by the C or C++
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]603frontends.</li>
Chris Lattner2af46052003-10-24 04:03:19 +0000[diff] [blame]604
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]605</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]606
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]607</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]608
609<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]610<div class="doc_section">
611 <a name="additionalinfo">Additional Information</a>
612</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]613<!-- *********************************************************************** -->
614
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]615<div class="doc_text">
616
617<p>A wide variety of additional information is available on the LLVM web page,
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]618including mailing lists and publications describing algorithms and components
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]619implemented in LLVM. The web page also contains versions of the API
620documentation which is up-to-date with the CVS version of the source code. You
621can access versions of these documents specific to this release by going into
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]622the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]623
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]624<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]625us via the <a href="http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev">mailing
626lists</a>.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]627
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]628</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]629
630<!-- *********************************************************************** -->
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]631
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]632<hr>
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]633<address>
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638
Misha Brukmane0c891c2003-11-22 01:00:11 +0000[diff] [blame]639 <a href="http://llvm.cs.uiuc.edu">The LLVM Compiler Infrastructure</a><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]640 Last modified: $Date$
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]641</address>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]642
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]643</body>
644</html>