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Chris Lattner163c3262004-08-16 00:20:18 +0000[diff] [blame]6 <title>LLVM 1.4 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 Lattner163c3262004-08-16 00:20:18 +0000[diff] [blame]10<div class="doc_title">LLVM 1.4 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>
Chris Lattner77a51732004-04-30 22:17:12 +0000[diff] [blame]15 <li><a href="GettingStarted.html">Installation Instructions</a></li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]16 <li><a href="#portability">Portability and Supported Platforms</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>
Misha Brukmana516e992004-07-12 16:55:41 +0000[diff] [blame]25 <li><a href="#sparcv9-be">Known problems with the SparcV9 Back-end</a>
Chris Lattnerdf925ce2004-11-07 01:55:32 +0000[diff] [blame^]26 <li><a href="#ppc-be">Known problems with the PowerPC Back-end</a>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]27 <li><a href="#c-be">Known problems with the C back-end</a>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]28 </ul></li>
29 <li><a href="#additionalinfo">Additional Information</a></li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]30</ol>
31
Chris Lattner020e1fc2004-05-23 21:07:27 +0000[diff] [blame]32<div class="doc_author">
33 <p>Written by the <a href="http://llvm.cs.uiuc.edu">LLVM team</a><p>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]34</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]35
36<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]37<div class="doc_section">
38 <a name="intro">Introduction</a>
39</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]40<!-- *********************************************************************** -->
41
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]42<div class="doc_text">
43
44<p>This document contains the release notes for the LLVM compiler
Chris Lattner163c3262004-08-16 00:20:18 +0000[diff] [blame]45infrastructure, release 1.4. Here we describe the status of LLVM, including any
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]46known problems and bug fixes from the previous release. The most up-to-date
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]47version of this document can be found on the <a
Chris Lattner163c3262004-08-16 00:20:18 +0000[diff] [blame]48href="http://llvm.cs.uiuc.edu/releases/1.4/">LLVM 1.4 web site</a>. If you are
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]49not reading this on the LLVM web pages, you should probably go there because
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]50this document may be updated after the release.</p>
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]51
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]52<p>For more information about LLVM, including information about potentially more
Chris Lattnere7525b52003-10-07 21:38:31 +0000[diff] [blame]53current releases, please check out the <a href="http://llvm.cs.uiuc.edu">main
54web site</a>. If you have questions or comments, the <a
55href="http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVM developer's mailing
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]56list</a> is a good place to send them.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]57
Chris Lattnere76e9ab2003-12-12 04:25:33 +0000[diff] [blame]58<p>Note that if you are reading this file from CVS, this document applies
59to the <i>next</i> release, not the current one. To see the release notes for
60the current or previous releases, see the <a
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]61href="http://llvm.cs.uiuc.edu/releases/">releases page</a>.</p>
62
63</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]64
65<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]66<div class="doc_section">
67 <a name="whatsnew">What's New?</a>
68</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]69<!-- *********************************************************************** -->
70
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]71<div class="doc_text">
72
Chris Lattner163c3262004-08-16 00:20:18 +0000[diff] [blame]73<p>This is the fifth public release of the LLVM compiler infrastructure.</p>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]74
Misha Brukmanfa50a222004-05-12 21:46:05 +0000[diff] [blame]75<p> At this time, LLVM is known to correctly compile and run all C &amp; C++
Chris Lattner5cd40922004-08-02 20:28:44 +0000[diff] [blame]76SPEC CPU95 &amp; 2000 benchmarks, the Olden benchmarks, and the Ptrdist
Chris Lattner55266332004-10-16 18:35:57 +0000[diff] [blame]77benchmarks, and <b>many</b> other C and C++ programs.</p>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]78
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]79</div>
80
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]81<!--=========================================================================-->
82<div class="doc_subsubsection">
Chris Lattner8ebf2532004-02-25 16:36:51 +0000[diff] [blame]83<a name="newfeatures">This release implements the following new features:</a>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]84</div>
Chris Lattnere7525b52003-10-07 21:38:31 +0000[diff] [blame]85
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]86<div class="doc_text">
87
Chris Lattnere7525b52003-10-07 21:38:31 +0000[diff] [blame]88<ol>
Misha Brukmanbbd150e2004-10-16 19:13:58 +0000[diff] [blame]89 <li>The test/Programs hierarchy <a href="http://llvm.cs.uiuc.edu/PR257">has
Chris Lattner55266332004-10-16 18:35:57 +0000[diff] [blame]90 been moved out of the main LLVM tree</a> into a separate CVS repo and
91 tarball.</li>
92 <li>LLVM now optimizes global variables significantly more than it did
93 before.</li>
94 <li>LLVM now includes the new '<tt>undef</tt>' value and <a
95 href="LangRef.html#i_unreachable"><tt>unreachable</tt></a> instruction,
96 which give the optimizer more information about the behavior of the
97 program.</li>
Chris Lattnere721eb02004-10-27 16:28:17 +0000[diff] [blame]98 <li>The LLVM makefiles have been improved to build LLVM much faster and
99 includes new targets (like make dist-check).</li>
100 <li>The LLVM source code is now compatible with Microsoft Visual C++.</li>
Chris Lattner592db402003-11-19 22:05:38 +0000[diff] [blame]101</ol>
Chris Lattner4491de62003-11-08 04:28:55 +0000[diff] [blame]102
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]103</div>
104
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]105
106<!--=========================================================================-->
107<div class="doc_subsubsection">
108In this release, the following missing features were implemented:
109</div>
Chris Lattner4491de62003-11-08 04:28:55 +0000[diff] [blame]110
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]111<div class="doc_text">
112
Chris Lattner4491de62003-11-08 04:28:55 +0000[diff] [blame]113<ol>
Misha Brukmanbbd150e2004-10-16 19:13:58 +0000[diff] [blame]114<li><a href="http://llvm.cs.uiuc.edu/PR419">JIT interface should support
115 arbitrary calls</a></li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]116</ol>
Chris Lattnere7525b52003-10-07 21:38:31 +0000[diff] [blame]117
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]118</div>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]119
120<!--=========================================================================-->
121<div class="doc_subsubsection">
Misha Brukman017f2f32004-04-19 02:56:49 +0000[diff] [blame]122<a name="qualityofimp">In this release, the following Quality of Implementation
123issues were fixed:</a>
Chris Lattner4df78f02003-12-20 03:42:11 +0000[diff] [blame]124</div>
125
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]126<div class="doc_text">
127
Chris Lattner4df78f02003-12-20 03:42:11 +0000[diff] [blame]128<ol>
Chris Lattner99e41112004-10-09 19:19:57 +0000[diff] [blame]129<li><a href="http://llvm.cs.uiuc.edu/PR426">[llvmg++] Tons of warnings are spewed when
Chris Lattner615ffb82004-08-20 00:36:23 +0000[diff] [blame]130 linking to libstdc++</a></li>
Chris Lattner99e41112004-10-09 19:19:57 +0000[diff] [blame]131<li><a href="http://llvm.cs.uiuc.edu/PR352">include/{Support,Config} ->
Chris Lattner2249dd12004-09-19 19:21:26 +0000[diff] [blame]132 include/llvm/{Support,Config}</a></li>
Chris Lattner4df78f02003-12-20 03:42:11 +0000[diff] [blame]133</ol>
134
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]135</div>
136
Chris Lattner4df78f02003-12-20 03:42:11 +0000[diff] [blame]137<!--=========================================================================-->
138<div class="doc_subsubsection">
Chris Lattner8ebf2532004-02-25 16:36:51 +0000[diff] [blame]139In this release, the following build problems were fixed:
Brian Gaeke8b05e4f2004-01-16 21:55:04 +0000[diff] [blame]140</div>
141
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]142<div class="doc_text">
Brian Gaeke8b05e4f2004-01-16 21:55:04 +0000[diff] [blame]143<ol>
Chris Lattner163c3262004-08-16 00:20:18 +0000[diff] [blame]144<li></li>
Brian Gaeke8b05e4f2004-01-16 21:55:04 +0000[diff] [blame]145</ol>
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]146</div>
Brian Gaeke8b05e4f2004-01-16 21:55:04 +0000[diff] [blame]147
148<!--=========================================================================-->
149<div class="doc_subsubsection">
Chris Lattner2ad48782004-05-02 04:19:15 +0000[diff] [blame]150<a name="codequality">This release includes the following Code Quality
151improvements:</a>
Chris Lattner23257062004-05-23 20:42:08 +0000[diff] [blame]152</div>
Chris Lattner639579c2003-10-27 17:06:39 +0000[diff] [blame]153
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]154<div class="doc_text">
Chris Lattner639579c2003-10-27 17:06:39 +0000[diff] [blame]155<ol>
Chris Lattnerb84e1c52004-10-09 19:37:02 +0000[diff] [blame]156<li><a href="http://llvm.cs.uiuc.edu/PR362">Ugly code generated for
Chris Lattner2249dd12004-09-19 19:21:26 +0000[diff] [blame]157 std::min/std::max</a></li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]158</ol>
Reid Spencer3e58f582004-05-23 17:23:13 +0000[diff] [blame]159</div>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]160
161<!--=========================================================================-->
162<div class="doc_subsubsection">
Misha Brukman017f2f32004-04-19 02:56:49 +0000[diff] [blame]163<a name="bugfix">In this release, the following bugs in the previous release
164were fixed:</a>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]165</div>
166
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]167<div class="doc_text">
168
Chris Lattner5cd40922004-08-02 20:28:44 +0000[diff] [blame]169<p>Bugs fixed in the LLVM Core:</p>
Chris Lattnere7525b52003-10-07 21:38:31 +0000[diff] [blame]170
171<ol>
Chris Lattner99e41112004-10-09 19:19:57 +0000[diff] [blame]172<li><a href="http://llvm.cs.uiuc.edu/PR420">[licm] LICM invalidates alias analysis info
Chris Lattner59d448f2004-09-15 01:09:25 +0000[diff] [blame]173 and uses broken information</a> (optimizer crash)</li>
Chris Lattner99e41112004-10-09 19:19:57 +0000[diff] [blame]174<li><a href="http://llvm.cs.uiuc.edu/PR422">[asmwriter] Asmwriter is really slow for
Chris Lattner59d448f2004-09-15 01:09:25 +0000[diff] [blame]175 functions with lots of values</a></li>
Chris Lattner99e41112004-10-09 19:19:57 +0000[diff] [blame]176<li><a href="http://llvm.cs.uiuc.edu/PR423">[anders-aa] Andersen's AA is completely
Chris Lattnera10ed3b2004-08-16 05:46:57 +0000[diff] [blame]177 broken in LLVM 1.3</a></li>
Chris Lattner99e41112004-10-09 19:19:57 +0000[diff] [blame]178<li><a href="http://llvm.cs.uiuc.edu/PR430">[bcwriter] Empty compaction tables
Reid Spencer7d0a1232004-08-27 00:48:26 +0000[diff] [blame]179 defined</a></li>
Chris Lattnerbff64722004-10-25 22:13:02 +0000[diff] [blame]180<li><a href="http://llvm.cs.uiuc.edu/PR227">[X86] llc output for functions w/certain
181 names tickles GNU 'as' bugs</a></li>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]182</ol>
183
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]184<p>Bugs in the C/C++ front-end:</p>
185
186<ol>
Chris Lattner99e41112004-10-09 19:19:57 +0000[diff] [blame]187<li><a href="http://llvm.cs.uiuc.edu/PR445">[llvmg++] not enough templates are instantiated</a></li>
188<li><a href="http://llvm.cs.uiuc.edu/PR450">[llvmg++] Extern const globals cannot be
Chris Lattner2426ff92004-10-05 00:23:02 +0000[diff] [blame]189marked 'constant' if they have nontrivial ctors or dtors</a></li>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]190</ol>
Brian Gaeke730d8d62004-08-24 07:43:48 +0000[diff] [blame]191
192<p>Bugs fixed in the Sparc V9 back-end:</p>
193
194<ol>
Chris Lattner99e41112004-10-09 19:19:57 +0000[diff] [blame]195<li><a href="http://llvm.cs.uiuc.edu/PR428">[sparcv9] regalloc assertion
Brian Gaeke730d8d62004-08-24 07:43:48 +0000[diff] [blame]196 failure with certain indirect calls</a></li>
197</ol>
198
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]199</div>
Reid Spencer3e58f582004-05-23 17:23:13 +0000[diff] [blame]200
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]201<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]202<div class="doc_section">
203 <a name="portability">Portability and Supported Platforms</a>
204</div>
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]205<!-- *********************************************************************** -->
206
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]207<div class="doc_text">
208
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]209<p>LLVM is known to work in the following platforms:</p>
210
211<ul>
212<li>Intel and AMD machines running Red Hat Linux and FreeBSD (and probably
213 other unix-like systems).</li>
214<li>Sun UltraSPARC workstations running Solaris 8.</li>
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]215<li>Intel and AMD machines running on Win32 with the Cygwin libraries.</li>
Chris Lattnerd21e3d02004-08-05 21:53:13 +0000[diff] [blame]216<li>PowerPC-based Mac OS X boxes, running 10.2 and above. Note that no JIT
217support is available yet, and LLC support is beta. The C backend can be used
218to produce stable code for this platform.</li>
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]219</ul>
220
Brian Gaekee3e557e2004-05-09 05:28:35 +0000[diff] [blame]221<p>The core LLVM infrastructure uses
222<a href="http://www.gnu.org/software/autoconf/">GNU autoconf</a> to adapt itself
223to the machine and operating system on which it is built. However, minor
224porting may be required to get LLVM to work on new platforms. We welcome your
225portability patches and reports of successful builds or error messages.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]226
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]227<p>Note that the LLVM build system does not currently support directories with
228spaces on them when running on Win32/cygwin. We strongly recommend running
229LLVM and the C frontend out of a top-level directory without spaces (e.g.,
Chris Lattnerce1a3842004-06-01 19:41:30 +0000[diff] [blame]230<tt>/cygdrive/c/llvm</tt>). Also, make sure to install <b>all</b> of the
231cygwin packages. By default, many important tools are not installed that
Chris Lattnera752fce2004-08-16 20:20:46 +0000[diff] [blame]232are needed by the LLVM build process or test suite (e.g., /bin/time). Finally,
233please make sure that there are no directories with spaces in them in your
234PATH environment variable.</p>
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]235
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]236</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]237
238<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]239<div class="doc_section">
240 <a name="knownproblems">Known Problems</a>
241</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]242<!-- *********************************************************************** -->
243
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]244<div class="doc_text">
245
246<p>This section contains all known problems with the LLVM system, listed by
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]247component. As new problems are discovered, they will be added to these
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]248sections. If you run into a problem, please check the <a
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]249href="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]250there isn't already one.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]251
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]252</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]253
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]254<!-- ======================================================================= -->
255<div class="doc_subsection">
256 <a name="experimental">Experimental features included with this release</a>
257</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]258
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]259<div class="doc_text">
260
Misha Brukmanfa50a222004-05-12 21:46:05 +0000[diff] [blame]261<p>The following components of this LLVM release are either untested, known to
262be broken or unreliable, or are in early development. These components should
263not be relied on, and bugs should not be filed against them, but they may be
264useful to some people. In particular, if you would like to work on one of these
265components, please contact us on the llvmdev list.</p>
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]266
267<ul>
Misha Brukman467ea6b2004-08-05 21:04:03 +0000[diff] [blame]268<li>The PowerPC backend is incomplete and is known to miscompile several SPEC
269benchmarks. The file <tt>llvm/lib/Target/PowerPC/README.txt</tt> has
270details.</li>
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]271<li>The following passes are incomplete or buggy: <tt>-pgmdep, -memdep,
Chris Lattner09f3ac92004-09-14 16:43:13 +0000[diff] [blame]272 -ipmodref, -cee, -branch-combine, -instloops, -paths</tt></li>
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]273<li>The <tt>-pre</tt> pass is incomplete (there are cases it doesn't handle that
274 it should) and not thoroughly tested.</li>
275<li>The <tt>llvm-ar</tt> tool is incomplete and probably buggy.</li>
276<li>The <tt>llvm-db</tt> tool is in a very early stage of development.</li>
277</ul>
278
279</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]280
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]281<!-- ======================================================================= -->
282<div class="doc_subsection">
283 <a name="core">Known problems with the LLVM Core</a>
284</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]285
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]286<div class="doc_text">
287
288<ul>
289
290<li>In the JIT, <tt>dlsym</tt> on a symbol compiled by the JIT will not
291work.</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]292
293<li>The JIT does not use mutexes to protect its internal data structures. As
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]294such, execution of a threaded program could cause these data structures to be
295corrupted.</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]296
Chris Lattnerc0171082004-08-08 03:33:07 +0000[diff] [blame]297<li>Linking in static archive files (.a files) is slow (there is no symbol
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]298table in the archive).</li>
Chris Lattnerc679fbb2003-11-04 20:06:53 +0000[diff] [blame]299
Misha Brukman017f2f32004-04-19 02:56:49 +0000[diff] [blame]300<li>The gccld program <a href="http://llvm.cs.uiuc.edu/PR139">does not link
301objects/archives in the order specified on the command line.</a></li>
Chris Lattneraebc66a2004-02-15 23:09:07 +0000[diff] [blame]302
303<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]304values live across a setjmp as volatile</a>. This missing feature only affects
Chris Lattneraebc66a2004-02-15 23:09:07 +0000[diff] [blame]305targets whose setjmp/longjmp libraries do not save and restore the entire
306register file.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]307</ul>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]308</div>
309
310<!-- ======================================================================= -->
311<div class="doc_subsection">
312 <a name="c-fe">Known problems with the C front-end</a>
313</div>
Chris Lattner178f3db2003-10-02 05:07:23 +0000[diff] [blame]314
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]315<!-- _______________________________________________________________________ -->
Chris Lattner5a8a7282003-12-14 05:03:43 +0000[diff] [blame]316<div class="doc_subsubsection">Bugs</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]317
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]318<div class="doc_text">
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]319<ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]320<li>C99 Variable sized arrays do not release stack memory when they go out of
321 scope. Thus, the following program may run out of stack space:
322<pre>
323 for (i = 0; i != 1000000; ++i) {
324 int X[n];
325 foo(X);
326 }
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]327</pre></li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]328
Misha Brukmanfa50a222004-05-12 21:46:05 +0000[diff] [blame]329<li>Initialization of global union variables can only be done <a
330href="http://llvm.cs.uiuc.edu/bugs/show_bug.cgi?id=162">with the largest union
331member</a>.</li>
Chris Lattner1ab58dd2004-03-16 21:39:04 +0000[diff] [blame]332
Misha Brukman017f2f32004-04-19 02:56:49 +0000[diff] [blame]333<li><a href="http://llvm.cs.uiuc.edu/PR244">[llvm-gcc] Error when an implicitly
334external function is re-declared as static</a></li>
Chris Lattner1ab58dd2004-03-16 21:39:04 +0000[diff] [blame]335
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]336</ul>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]337</div>
338
339<!-- _______________________________________________________________________ -->
340<div class="doc_subsubsection">
341 Notes
342</div>
343
344<div class="doc_text">
345
346<ul>
347
348<li>Inline assembly is not yet supported.</li>
Chris Lattnerd2a74272003-10-27 18:30:37 +0000[diff] [blame]349
350<li>"long double" is transformed by the front-end into "double". There is no
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]351support for floating point data types of any size other than 32 and 64
352bits.</li>
353
354<li>The following Unix system functionality has not been tested and may not
355work:
Misha Brukman7cb4e382003-11-22 01:00:11 +0000[diff] [blame]356 <ol>
357 <li><tt>sigsetjmp</tt>, <tt>siglongjmp</tt> - These are not turned into the
358 appropriate <tt>invoke</tt>/<tt>unwind</tt> instructions. Note that
359 <tt>setjmp</tt> and <tt>longjmp</tt> <em>are</em> compiled correctly.
360 <li><tt>getcontext</tt>, <tt>setcontext</tt>, <tt>makecontext</tt>
361 - These functions have not been tested.
362 </ol></li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]363
364<li>Although many GCC extensions are supported, some are not. In particular,
365 the following extensions are known to <b>not be</b> supported:
366 <ol>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]367 <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]368 <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>
369 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Constructing-Calls.html#Constructing%20Calls">Constructing Calls</a>: Dispatching a call to another function.</li>
370 <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]371 <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]372 <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>
373 <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]374 <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>
375 <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>
376 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Thread-Local.html#Thread-Local">Thread-Local</a>: Per-thread variables.</li>
377 <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]378 </ol>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]379
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]380 <p>The following GCC extensions are <b>partially</b> supported. An ignored
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]381 attribute means that the LLVM compiler ignores the presence of the attribute,
382 but the code should still work. An unsupported attribute is one which is
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]383 ignored by the LLVM compiler and will cause a different interpretation of
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]384 the program.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]385
386 <ol>
387 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Length.html#Variable%20Length">Variable Length</a>:
388 Arrays whose length is computed at run time.<br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]389 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]390
391 <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]392
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]393 Declaring that functions have no side effects or that they can never
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]394 return.<br>
395
396 <b>Supported:</b> <tt>format</tt>, <tt>format_arg</tt>, <tt>non_null</tt>,
397 <tt>constructor</tt>, <tt>destructor</tt>, <tt>unused</tt>,
398 <tt>deprecated</tt>, <tt>warn_unused_result</tt>, <tt>weak</tt><br>
399
400 <b>Ignored:</b> <tt>noreturn</tt>, <tt>noinline</tt>,
401 <tt>always_inline</tt>, <tt>pure</tt>, <tt>const</tt>, <tt>nothrow</tt>,
402 <tt>malloc</tt>, <tt>no_instrument_function</tt>, <tt>cdecl</tt><br>
403
404 <b>Unsupported:</b> <tt>used</tt>, <tt>section</tt>, <tt>alias</tt>,
405 <tt>visibility</tt>, <tt>regparm</tt>, <tt>stdcall</tt>,
406 <tt>fastcall</tt>, all other target specific attributes</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]407
408 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Attributes.html#Variable%20Attributes">Variable Attributes</a>:
409 Specifying attributes of variables.<br>
410 <b>Supported:</b> <tt>cleanup</tt>, <tt>common</tt>, <tt>nocommon</tt>,
411 <tt>deprecated</tt>, <tt>transparent_union</tt>,
412 <tt>unused</tt>, <tt>weak</tt><br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]413
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]414 <b>Unsupported:</b> <tt>aligned</tt>, <tt>mode</tt>, <tt>packed</tt>,
415 <tt>section</tt>, <tt>shared</tt>, <tt>tls_model</tt>,
416 <tt>vector_size</tt>, <tt>dllimport</tt>,
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]417 <tt>dllexport</tt>, all target specific attributes.</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]418
Misha Brukman8395d732003-12-12 04:37:31 +0000[diff] [blame]419 <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]420 <b>Supported:</b> <tt>transparent_union</tt>, <tt>unused</tt>,
Misha Brukman8395d732003-12-12 04:37:31 +0000[diff] [blame]421 <tt>deprecated</tt>, <tt>may_alias</tt><br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]422
423 <b>Unsupported:</b> <tt>aligned</tt>, <tt>packed</tt>,
424 all target specific attributes.</li>
425
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]426 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html#Other%20Builtins">Other Builtins</a>:
427 Other built-in functions.<br>
428 We support all builtins which have a C language equivalent (e.g.,
429 <tt>__builtin_cos</tt>), <tt>__builtin_alloca</tt>,
430 <tt>__builtin_types_compatible_p</tt>, <tt>__builtin_choose_expr</tt>,
Chris Lattnerb7c4bac2004-06-18 06:26:29 +0000[diff] [blame]431 <tt>__builtin_constant_p</tt>, and <tt>__builtin_expect</tt>
432 (currently ignored). We also support builtins for ISO C99 floating
433 point comparison macros (e.g., <tt>__builtin_islessequal</tt>).</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]434 </ol>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]435
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]436 <p>The following extensions <b>are</b> known to be supported:</p>
437
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]438 <ol>
Chris Lattnerd3dc8502004-03-16 08:54:07 +0000[diff] [blame]439 <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]440 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html#Statement%20Exprs">Statement Exprs</a>: Putting statements and declarations inside expressions.</li>
441 <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>
Tanya Lattnerce33a1b2004-06-22 03:48:17 +0000[diff] [blame]442 <li><a href="http://gcc.gnu.org/onlinedocs/gcc-3.4.0/gcc/Lvalues.html#Lvalues">Lvalues</a>: Using <code>?:</code>, "<code>,</code>" and casts in lvalues.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]443 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Conditionals.html#Conditionals">Conditionals</a>: Omitting the middle operand of a <code>?:</code> expression.</li>
444 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Long-Long.html#Long%20Long">Long Long</a>: Double-word integers.</li>
445 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Complex.html#Complex">Complex</a>: Data types for complex numbers.</li>
446 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Hex-Floats.html#Hex%20Floats">Hex Floats</a>:Hexadecimal floating-point constants.</li>
447 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html#Zero%20Length">Zero Length</a>: Zero-length arrays.</li>
448 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Empty-Structures.html#Empty%20Structures">Empty Structures</a>: Structures with no members.</li>
449 <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>
450 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Escaped-Newlines.html#Escaped%20Newlines">Escaped Newlines</a>: Slightly looser rules for escaped newlines.</li>
451 <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]452 <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]453 <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]454 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Compound-Literals.html#Compound%20Literals">Compound Literals</a>: Compound literals give structures, unions,
455or arrays as values.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]456 <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]457 <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]458 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Case-Ranges.html#Case%20Ranges">Case Ranges</a>: `case 1 ... 9' and such.</li>
459 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Mixed-Declarations.html#Mixed%20Declarations">Mixed Declarations</a>: Mixing declarations and code.</li>
460 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Function-Prototypes.html#Function%20Prototypes">Function Prototypes</a>: Prototype declarations and old-style definitions.</li>
461 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/C---Comments.html#C++%20Comments">C++ Comments</a>: C++ comments are recognized.</li>
462 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Dollar-Signs.html#Dollar%20Signs">Dollar Signs</a>: Dollar sign is allowed in identifiers.</li>
463 <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>
464 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Alignment.html#Alignment">Alignment</a>: Inquiring about the alignment of a type or variable.</li>
465 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Inline.html#Inline">Inline</a>: Defining inline functions (as fast as macros).</li>
466 <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>
467 <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>
468 <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]469 <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]470 <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>
471 <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]472 </ol></li>
473
474</ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]475
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]476<p>If you run into GCC extensions which have not been included in any of these
477lists, please let us know (also including whether or not they work).</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]478
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]479</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]480
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]481<!-- ======================================================================= -->
482<div class="doc_subsection">
483 <a name="c++-fe">Known problems with the C++ front-end</a>
484</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]485
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]486<div class="doc_text">
487
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]488<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]489has not been tested as thoroughly as the C front-end. It has been tested and
490works for a number of non-trivial programs, but there may be lurking bugs.
491Please report any bugs or problems.</p>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]492
493</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]494
495<!-- _______________________________________________________________________ -->
Chris Lattner141ebb62004-02-14 04:12:41 +0000[diff] [blame]496<div class="doc_subsubsection">Bugs</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]497
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]498<div class="doc_text">
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]499
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]500<ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]501<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]502 front-end</a>.</li>
Chris Lattner041e6c92004-07-17 02:04:41 +0000[diff] [blame]503
Chris Lattner5cd40922004-08-02 20:28:44 +0000[diff] [blame]504<li><b>IA-64 specific</b>: The C++ front-end does not use <a
505href="http://llvm.cs.uiuc.edu/PR406">IA64 ABI compliant layout of v-tables</a>.
Chris Lattner041e6c92004-07-17 02:04:41 +0000[diff] [blame]506In particular, it just stores function pointers instead of function
507descriptors in the vtable. This bug prevents mixing C++ code compiled with
Chris Lattner2fd93492004-08-02 20:29:51 +0000[diff] [blame]508LLVM with C++ objects compiled by other C++ compilers.</li>
Chris Lattner041e6c92004-07-17 02:04:41 +0000[diff] [blame]509
Chris Lattner5cd40922004-08-02 20:28:44 +0000[diff] [blame]510</ul>
511
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]512</div>
513
514<!-- _______________________________________________________________________ -->
515<div class="doc_subsubsection">
516 Notes
517</div>
518
519<div class="doc_text">
520
521<ul>
Chris Lattnerd2a74272003-10-27 18:30:37 +0000[diff] [blame]522
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]523<li>The C++ front-end is based on a pre-release of the GCC 3.4 C++ parser. This
524parser is significantly more standards compliant (and picky) than prior GCC
525versions. For more information, see the C++ section of the <a
Chris Lattnere76e9ab2003-12-12 04:25:33 +0000[diff] [blame]526href="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]527
528<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]529 performed. In particular, destructors for objects in the <tt>longjmp</tt>ing
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]530 function and in the <tt>setjmp</tt> receiver function may not be run.
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]531 Objects in intervening stack frames will be destroyed, however (which is
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]532 better than most compilers).</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]533
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]534<li>The LLVM C++ front-end follows the <a
535 href="http://www.codesourcery.com/cxx-abi">Itanium C++ ABI</a>.
536 This document, which is not Itanium specific, specifies a standard for name
537 mangling, class layout, v-table layout, RTTI formats, and other C++
538 representation issues. Because we use this API, code generated by the LLVM
539 compilers should be binary compatible with machine code generated by other
540 Itanium ABI C++ compilers (such as G++, the Intel and HP compilers, etc).
541 <i>However</i>, the exception handling mechanism used by LLVM is very
542 different from the model used in the Itanium ABI, so <b>exceptions will not
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]543 interact correctly</b>. </li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]544
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]545</ul>
Chris Lattner46ecf612003-10-07 22:14:37 +0000[diff] [blame]546
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]547</div>
548
549<!-- ======================================================================= -->
550<div class="doc_subsection">
551 <a name="x86-be">Known problems with the X86 back-end</a>
552</div>
553
554<div class="doc_text">
555
556<ul>
Chris Lattner5cd40922004-08-02 20:28:44 +0000[diff] [blame]557 <li>none yet</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]558</ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]559
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]560</div>
561
562<!-- ======================================================================= -->
563<div class="doc_subsection">
Misha Brukmana516e992004-07-12 16:55:41 +0000[diff] [blame]564 <a name="sparcv9-be">Known problems with the SparcV9 back-end</a>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]565</div>
566
567<div class="doc_text">
568
569<ul>
Misha Brukmana516e992004-07-12 16:55:41 +0000[diff] [blame]570<li><a href="http://llvm.cs.uiuc.edu/PR60">[sparcv9] SparcV9 backend miscompiles
571several programs in the LLVM test suite</a></li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]572</ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]573
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]574</div>
575
576<!-- ======================================================================= -->
577<div class="doc_subsection">
Chris Lattnerdf925ce2004-11-07 01:55:32 +0000[diff] [blame^]578 <a name="ppc-be">Known problems with the PowerPC back-end</a>
579</div>
580
581<div class="doc_text">
582
583<ul>
584<li>none yet</li>
585</ul>
586
587</div>
588
589<!-- ======================================================================= -->
590<div class="doc_subsection">
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]591 <a name="c-be">Known problems with the C back-end</a>
592</div>
593
594<div class="doc_text">
595
596<ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]597
598<li>The C back-end produces code that violates the ANSI C Type-Based Alias
599Analysis rules. As such, special options may be necessary to compile the code
600(for example, GCC requires the <tt>-fno-strict-aliasing</tt> option). This
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]601problem probably cannot be fixed.</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]602
Chris Lattnera623e482003-10-20 19:05:03 +0000[diff] [blame]603<li><a href="http://llvm.cs.uiuc.edu/PR33">Initializers for global variables</a>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]604cannot include special floating point numbers like Not-A-Number or
605Infinity.</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]606
Chris Lattnerc679fbb2003-11-04 20:06:53 +0000[diff] [blame]607<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]608supported</a>. This should not affect LLVM produced by the C or C++
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]609frontends.</li>
Chris Lattnerb28c3282003-10-24 04:03:19 +0000[diff] [blame]610
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]611</ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]612
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]613</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]614
615<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]616<div class="doc_section">
617 <a name="additionalinfo">Additional Information</a>
618</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]619<!-- *********************************************************************** -->
620
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]621<div class="doc_text">
622
623<p>A wide variety of additional information is available on the LLVM web page,
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]624including mailing lists and publications describing algorithms and components
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]625implemented in LLVM. The web page also contains versions of the API
626documentation which is up-to-date with the CVS version of the source code. You
627can access versions of these documents specific to this release by going into
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]628the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]629
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]630<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]631us via the <a href="http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev">mailing
632lists</a>.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]633
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]634</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]635
636<!-- *********************************************************************** -->
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]637
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]638<hr>
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]639<address>
Misha Brukman8834af92003-12-21 22:53:21 +0000[diff] [blame]640 <a href="http://jigsaw.w3.org/css-validator/check/referer"><img
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]641 src="http://jigsaw.w3.org/css-validator/images/vcss" alt="Valid CSS!"></a>
642 <a href="http://validator.w3.org/check/referer"><img
643 src="http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01!" /></a>
644
Misha Brukman7cb4e382003-11-22 01:00:11 +0000[diff] [blame]645 <a href="http://llvm.cs.uiuc.edu">The LLVM Compiler Infrastructure</a><br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]646 Last modified: $Date$
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]647</address>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]648
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]649</body>
650</html>