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gerrit-public.fairphone.software / toolchain / llvm-project / 552663387bfd38cc54d2dfaa9b4ce9b4f019cbcf / . / llvm / docs / ReleaseNotes.html
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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 Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]26 <li><a href="#c-be">Known problems with the C back-end</a>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]27 </ul></li>
28 <li><a href="#additionalinfo">Additional Information</a></li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]29</ol>
30
Chris Lattner020e1fc2004-05-23 21:07:27 +0000[diff] [blame]31<div class="doc_author">
32 <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]33</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]34
35<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]36<div class="doc_section">
37 <a name="intro">Introduction</a>
38</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]39<!-- *********************************************************************** -->
40
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]41<div class="doc_text">
42
43<p>This document contains the release notes for the LLVM compiler
Chris Lattner163c3262004-08-16 00:20:18 +0000[diff] [blame]44infrastructure, release 1.4. Here we describe the status of LLVM, including any
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]45known problems and bug fixes from the previous release. The most up-to-date
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]46version of this document can be found on the <a
Chris Lattner163c3262004-08-16 00:20:18 +0000[diff] [blame]47href="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]48not reading this on the LLVM web pages, you should probably go there because
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]49this document may be updated after the release.</p>
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]50
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]51<p>For more information about LLVM, including information about potentially more
Chris Lattnere7525b52003-10-07 21:38:31 +0000[diff] [blame]52current releases, please check out the <a href="http://llvm.cs.uiuc.edu">main
53web site</a>. If you have questions or comments, the <a
54href="http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVM developer's mailing
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]55list</a> is a good place to send them.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]56
Chris Lattnere76e9ab2003-12-12 04:25:33 +0000[diff] [blame]57<p>Note that if you are reading this file from CVS, this document applies
58to the <i>next</i> release, not the current one. To see the release notes for
59the current or previous releases, see the <a
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]60href="http://llvm.cs.uiuc.edu/releases/">releases page</a>.</p>
61
62</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]63
64<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]65<div class="doc_section">
66 <a name="whatsnew">What's New?</a>
67</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]68<!-- *********************************************************************** -->
69
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]70<div class="doc_text">
71
Chris Lattner163c3262004-08-16 00:20:18 +0000[diff] [blame]72<p>This is the fifth public release of the LLVM compiler infrastructure.</p>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]73
Misha Brukmanfa50a222004-05-12 21:46:05 +0000[diff] [blame]74<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]75SPEC CPU95 &amp; 2000 benchmarks, the Olden benchmarks, and the Ptrdist
Chris Lattner55266332004-10-16 18:35:57 +0000[diff] [blame^]76benchmarks, and <b>many</b> other C and C++ programs.</p>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]77
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]78</div>
79
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]80<!--=========================================================================-->
81<div class="doc_subsubsection">
Chris Lattner8ebf2532004-02-25 16:36:51 +0000[diff] [blame]82<a name="newfeatures">This release implements the following new features:</a>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]83</div>
Chris Lattnere7525b52003-10-07 21:38:31 +0000[diff] [blame]84
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]85<div class="doc_text">
86
Chris Lattnere7525b52003-10-07 21:38:31 +0000[diff] [blame]87<ol>
Chris Lattner55266332004-10-16 18:35:57 +0000[diff] [blame^]88 <li>The test/Programs hierarchy<a href="http://llvm.cs.uiuc.edu/PR257">has
89 been moved out of the main LLVM tree</a> into a separate CVS repo and
90 tarball.</li>
91 <li>LLVM now optimizes global variables significantly more than it did
92 before.</li>
93 <li>LLVM now includes the new '<tt>undef</tt>' value and <a
94 href="LangRef.html#i_unreachable"><tt>unreachable</tt></a> instruction,
95 which give the optimizer more information about the behavior of the
96 program.</li>
Chris Lattner592db402003-11-19 22:05:38 +0000[diff] [blame]97</ol>
Chris Lattner4491de62003-11-08 04:28:55 +0000[diff] [blame]98
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]99</div>
100
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]101
102<!--=========================================================================-->
103<div class="doc_subsubsection">
104In this release, the following missing features were implemented:
105</div>
Chris Lattner4491de62003-11-08 04:28:55 +0000[diff] [blame]106
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]107<div class="doc_text">
108
Chris Lattner4491de62003-11-08 04:28:55 +0000[diff] [blame]109<ol>
Chris Lattner99e41112004-10-09 19:19:57 +0000[diff] [blame]110<li><a href="http://llvm.cs.uiuc.edu/PR419">JIT interface should support arbitrary
Chris Lattner163c3262004-08-16 00:20:18 +0000[diff] [blame]111 calls</a></li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]112</ol>
Chris Lattnere7525b52003-10-07 21:38:31 +0000[diff] [blame]113
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]114</div>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]115
116<!--=========================================================================-->
117<div class="doc_subsubsection">
Misha Brukman017f2f32004-04-19 02:56:49 +0000[diff] [blame]118<a name="qualityofimp">In this release, the following Quality of Implementation
119issues were fixed:</a>
Chris Lattner4df78f02003-12-20 03:42:11 +0000[diff] [blame]120</div>
121
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]122<div class="doc_text">
123
Chris Lattner4df78f02003-12-20 03:42:11 +0000[diff] [blame]124<ol>
Chris Lattner99e41112004-10-09 19:19:57 +0000[diff] [blame]125<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]126 linking to libstdc++</a></li>
Chris Lattner99e41112004-10-09 19:19:57 +0000[diff] [blame]127<li><a href="http://llvm.cs.uiuc.edu/PR352">include/{Support,Config} ->
Chris Lattner2249dd12004-09-19 19:21:26 +0000[diff] [blame]128 include/llvm/{Support,Config}</a></li>
Chris Lattner4df78f02003-12-20 03:42:11 +0000[diff] [blame]129</ol>
130
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]131</div>
132
Chris Lattner4df78f02003-12-20 03:42:11 +0000[diff] [blame]133<!--=========================================================================-->
134<div class="doc_subsubsection">
Chris Lattner8ebf2532004-02-25 16:36:51 +0000[diff] [blame]135In this release, the following build problems were fixed:
Brian Gaeke8b05e4f2004-01-16 21:55:04 +0000[diff] [blame]136</div>
137
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]138<div class="doc_text">
Brian Gaeke8b05e4f2004-01-16 21:55:04 +0000[diff] [blame]139<ol>
Chris Lattner163c3262004-08-16 00:20:18 +0000[diff] [blame]140<li></li>
Brian Gaeke8b05e4f2004-01-16 21:55:04 +0000[diff] [blame]141</ol>
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]142</div>
Brian Gaeke8b05e4f2004-01-16 21:55:04 +0000[diff] [blame]143
144<!--=========================================================================-->
145<div class="doc_subsubsection">
Chris Lattner2ad48782004-05-02 04:19:15 +0000[diff] [blame]146<a name="codequality">This release includes the following Code Quality
147improvements:</a>
Chris Lattner23257062004-05-23 20:42:08 +0000[diff] [blame]148</div>
Chris Lattner639579c2003-10-27 17:06:39 +0000[diff] [blame]149
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]150<div class="doc_text">
Chris Lattner639579c2003-10-27 17:06:39 +0000[diff] [blame]151<ol>
Chris Lattnerb84e1c52004-10-09 19:37:02 +0000[diff] [blame]152<li><a href="http://llvm.cs.uiuc.edu/PR362">Ugly code generated for
Chris Lattner2249dd12004-09-19 19:21:26 +0000[diff] [blame]153 std::min/std::max</a></li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]154</ol>
Reid Spencer3e58f582004-05-23 17:23:13 +0000[diff] [blame]155</div>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]156
157<!--=========================================================================-->
158<div class="doc_subsubsection">
Misha Brukman017f2f32004-04-19 02:56:49 +0000[diff] [blame]159<a name="bugfix">In this release, the following bugs in the previous release
160were fixed:</a>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]161</div>
162
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]163<div class="doc_text">
164
Chris Lattner5cd40922004-08-02 20:28:44 +0000[diff] [blame]165<p>Bugs fixed in the LLVM Core:</p>
Chris Lattnere7525b52003-10-07 21:38:31 +0000[diff] [blame]166
167<ol>
Chris Lattner99e41112004-10-09 19:19:57 +0000[diff] [blame]168<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]169 and uses broken information</a> (optimizer crash)</li>
Chris Lattner99e41112004-10-09 19:19:57 +0000[diff] [blame]170<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]171 functions with lots of values</a></li>
Chris Lattner99e41112004-10-09 19:19:57 +0000[diff] [blame]172<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]173 broken in LLVM 1.3</a></li>
Chris Lattner99e41112004-10-09 19:19:57 +0000[diff] [blame]174<li><a href="http://llvm.cs.uiuc.edu/PR430">[bcwriter] Empty compaction tables
Reid Spencer7d0a1232004-08-27 00:48:26 +0000[diff] [blame]175 defined</a></li>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]176</ol>
177
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]178<p>Bugs in the C/C++ front-end:</p>
179
180<ol>
Chris Lattner99e41112004-10-09 19:19:57 +0000[diff] [blame]181<li><a href="http://llvm.cs.uiuc.edu/PR445">[llvmg++] not enough templates are instantiated</a></li>
182<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]183marked 'constant' if they have nontrivial ctors or dtors</a></li>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]184</ol>
Brian Gaeke730d8d62004-08-24 07:43:48 +0000[diff] [blame]185
186<p>Bugs fixed in the Sparc V9 back-end:</p>
187
188<ol>
Chris Lattner99e41112004-10-09 19:19:57 +0000[diff] [blame]189<li><a href="http://llvm.cs.uiuc.edu/PR428">[sparcv9] regalloc assertion
Brian Gaeke730d8d62004-08-24 07:43:48 +0000[diff] [blame]190 failure with certain indirect calls</a></li>
191</ol>
192
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]193</div>
Reid Spencer3e58f582004-05-23 17:23:13 +0000[diff] [blame]194
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]195<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]196<div class="doc_section">
197 <a name="portability">Portability and Supported Platforms</a>
198</div>
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]199<!-- *********************************************************************** -->
200
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]201<div class="doc_text">
202
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]203<p>LLVM is known to work in the following platforms:</p>
204
205<ul>
206<li>Intel and AMD machines running Red Hat Linux and FreeBSD (and probably
207 other unix-like systems).</li>
208<li>Sun UltraSPARC workstations running Solaris 8.</li>
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]209<li>Intel and AMD machines running on Win32 with the Cygwin libraries.</li>
Chris Lattnerd21e3d02004-08-05 21:53:13 +0000[diff] [blame]210<li>PowerPC-based Mac OS X boxes, running 10.2 and above. Note that no JIT
211support is available yet, and LLC support is beta. The C backend can be used
212to produce stable code for this platform.</li>
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]213</ul>
214
Brian Gaekee3e557e2004-05-09 05:28:35 +0000[diff] [blame]215<p>The core LLVM infrastructure uses
216<a href="http://www.gnu.org/software/autoconf/">GNU autoconf</a> to adapt itself
217to the machine and operating system on which it is built. However, minor
218porting may be required to get LLVM to work on new platforms. We welcome your
219portability patches and reports of successful builds or error messages.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]220
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]221<p>Note that the LLVM build system does not currently support directories with
222spaces on them when running on Win32/cygwin. We strongly recommend running
223LLVM and the C frontend out of a top-level directory without spaces (e.g.,
Chris Lattnerce1a3842004-06-01 19:41:30 +0000[diff] [blame]224<tt>/cygdrive/c/llvm</tt>). Also, make sure to install <b>all</b> of the
225cygwin packages. By default, many important tools are not installed that
Chris Lattnera752fce2004-08-16 20:20:46 +0000[diff] [blame]226are needed by the LLVM build process or test suite (e.g., /bin/time). Finally,
227please make sure that there are no directories with spaces in them in your
228PATH environment variable.</p>
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]229
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]230</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]231
232<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]233<div class="doc_section">
234 <a name="knownproblems">Known Problems</a>
235</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]236<!-- *********************************************************************** -->
237
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]238<div class="doc_text">
239
240<p>This section contains all known problems with the LLVM system, listed by
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]241component. As new problems are discovered, they will be added to these
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]242sections. If you run into a problem, please check the <a
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]243href="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]244there isn't already one.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]245
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]246</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]247
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]248<!-- ======================================================================= -->
249<div class="doc_subsection">
250 <a name="experimental">Experimental features included with this release</a>
251</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]252
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]253<div class="doc_text">
254
Misha Brukmanfa50a222004-05-12 21:46:05 +0000[diff] [blame]255<p>The following components of this LLVM release are either untested, known to
256be broken or unreliable, or are in early development. These components should
257not be relied on, and bugs should not be filed against them, but they may be
258useful to some people. In particular, if you would like to work on one of these
259components, please contact us on the llvmdev list.</p>
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]260
261<ul>
Misha Brukman467ea6b2004-08-05 21:04:03 +0000[diff] [blame]262<li>The PowerPC backend is incomplete and is known to miscompile several SPEC
263benchmarks. The file <tt>llvm/lib/Target/PowerPC/README.txt</tt> has
264details.</li>
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]265<li>The following passes are incomplete or buggy: <tt>-pgmdep, -memdep,
Chris Lattner09f3ac92004-09-14 16:43:13 +0000[diff] [blame]266 -ipmodref, -cee, -branch-combine, -instloops, -paths</tt></li>
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]267<li>The <tt>-pre</tt> pass is incomplete (there are cases it doesn't handle that
268 it should) and not thoroughly tested.</li>
269<li>The <tt>llvm-ar</tt> tool is incomplete and probably buggy.</li>
270<li>The <tt>llvm-db</tt> tool is in a very early stage of development.</li>
271</ul>
272
273</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]274
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]275<!-- ======================================================================= -->
276<div class="doc_subsection">
277 <a name="core">Known problems with the LLVM Core</a>
278</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]279
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]280<div class="doc_text">
281
282<ul>
283
284<li>In the JIT, <tt>dlsym</tt> on a symbol compiled by the JIT will not
285work.</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]286
287<li>The JIT does not use mutexes to protect its internal data structures. As
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]288such, execution of a threaded program could cause these data structures to be
289corrupted.</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]290
Chris Lattnerc0171082004-08-08 03:33:07 +0000[diff] [blame]291<li>Linking in static archive files (.a files) is slow (there is no symbol
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]292table in the archive).</li>
Chris Lattnerc679fbb2003-11-04 20:06:53 +0000[diff] [blame]293
Misha Brukman017f2f32004-04-19 02:56:49 +0000[diff] [blame]294<li>The gccld program <a href="http://llvm.cs.uiuc.edu/PR139">does not link
295objects/archives in the order specified on the command line.</a></li>
Chris Lattneraebc66a2004-02-15 23:09:07 +0000[diff] [blame]296
297<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]298values live across a setjmp as volatile</a>. This missing feature only affects
Chris Lattneraebc66a2004-02-15 23:09:07 +0000[diff] [blame]299targets whose setjmp/longjmp libraries do not save and restore the entire
300register file.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]301</ul>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]302</div>
303
304<!-- ======================================================================= -->
305<div class="doc_subsection">
306 <a name="c-fe">Known problems with the C front-end</a>
307</div>
Chris Lattner178f3db2003-10-02 05:07:23 +0000[diff] [blame]308
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]309<!-- _______________________________________________________________________ -->
Chris Lattner5a8a7282003-12-14 05:03:43 +0000[diff] [blame]310<div class="doc_subsubsection">Bugs</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]311
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]312<div class="doc_text">
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]313<ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]314<li>C99 Variable sized arrays do not release stack memory when they go out of
315 scope. Thus, the following program may run out of stack space:
316<pre>
317 for (i = 0; i != 1000000; ++i) {
318 int X[n];
319 foo(X);
320 }
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]321</pre></li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]322
Misha Brukmanfa50a222004-05-12 21:46:05 +0000[diff] [blame]323<li>Initialization of global union variables can only be done <a
324href="http://llvm.cs.uiuc.edu/bugs/show_bug.cgi?id=162">with the largest union
325member</a>.</li>
Chris Lattner1ab58dd2004-03-16 21:39:04 +0000[diff] [blame]326
Misha Brukman017f2f32004-04-19 02:56:49 +0000[diff] [blame]327<li><a href="http://llvm.cs.uiuc.edu/PR244">[llvm-gcc] Error when an implicitly
328external function is re-declared as static</a></li>
Chris Lattner1ab58dd2004-03-16 21:39:04 +0000[diff] [blame]329
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]330</ul>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]331</div>
332
333<!-- _______________________________________________________________________ -->
334<div class="doc_subsubsection">
335 Notes
336</div>
337
338<div class="doc_text">
339
340<ul>
341
342<li>Inline assembly is not yet supported.</li>
Chris Lattnerd2a74272003-10-27 18:30:37 +0000[diff] [blame]343
344<li>"long double" is transformed by the front-end into "double". There is no
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]345support for floating point data types of any size other than 32 and 64
346bits.</li>
347
348<li>The following Unix system functionality has not been tested and may not
349work:
Misha Brukman7cb4e382003-11-22 01:00:11 +0000[diff] [blame]350 <ol>
351 <li><tt>sigsetjmp</tt>, <tt>siglongjmp</tt> - These are not turned into the
352 appropriate <tt>invoke</tt>/<tt>unwind</tt> instructions. Note that
353 <tt>setjmp</tt> and <tt>longjmp</tt> <em>are</em> compiled correctly.
354 <li><tt>getcontext</tt>, <tt>setcontext</tt>, <tt>makecontext</tt>
355 - These functions have not been tested.
356 </ol></li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]357
358<li>Although many GCC extensions are supported, some are not. In particular,
359 the following extensions are known to <b>not be</b> supported:
360 <ol>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]361 <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]362 <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>
363 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Constructing-Calls.html#Constructing%20Calls">Constructing Calls</a>: Dispatching a call to another function.</li>
364 <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]365 <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]366 <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>
367 <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]368 <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>
369 <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>
370 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Thread-Local.html#Thread-Local">Thread-Local</a>: Per-thread variables.</li>
371 <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]372 </ol>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]373
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]374 <p>The following GCC extensions are <b>partially</b> supported. An ignored
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]375 attribute means that the LLVM compiler ignores the presence of the attribute,
376 but the code should still work. An unsupported attribute is one which is
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]377 ignored by the LLVM compiler and will cause a different interpretation of
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]378 the program.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]379
380 <ol>
381 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Length.html#Variable%20Length">Variable Length</a>:
382 Arrays whose length is computed at run time.<br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]383 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]384
385 <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]386
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]387 Declaring that functions have no side effects or that they can never
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]388 return.<br>
389
390 <b>Supported:</b> <tt>format</tt>, <tt>format_arg</tt>, <tt>non_null</tt>,
391 <tt>constructor</tt>, <tt>destructor</tt>, <tt>unused</tt>,
392 <tt>deprecated</tt>, <tt>warn_unused_result</tt>, <tt>weak</tt><br>
393
394 <b>Ignored:</b> <tt>noreturn</tt>, <tt>noinline</tt>,
395 <tt>always_inline</tt>, <tt>pure</tt>, <tt>const</tt>, <tt>nothrow</tt>,
396 <tt>malloc</tt>, <tt>no_instrument_function</tt>, <tt>cdecl</tt><br>
397
398 <b>Unsupported:</b> <tt>used</tt>, <tt>section</tt>, <tt>alias</tt>,
399 <tt>visibility</tt>, <tt>regparm</tt>, <tt>stdcall</tt>,
400 <tt>fastcall</tt>, all other target specific attributes</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]401
402 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Attributes.html#Variable%20Attributes">Variable Attributes</a>:
403 Specifying attributes of variables.<br>
404 <b>Supported:</b> <tt>cleanup</tt>, <tt>common</tt>, <tt>nocommon</tt>,
405 <tt>deprecated</tt>, <tt>transparent_union</tt>,
406 <tt>unused</tt>, <tt>weak</tt><br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]407
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]408 <b>Unsupported:</b> <tt>aligned</tt>, <tt>mode</tt>, <tt>packed</tt>,
409 <tt>section</tt>, <tt>shared</tt>, <tt>tls_model</tt>,
410 <tt>vector_size</tt>, <tt>dllimport</tt>,
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]411 <tt>dllexport</tt>, all target specific attributes.</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]412
Misha Brukman8395d732003-12-12 04:37:31 +0000[diff] [blame]413 <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]414 <b>Supported:</b> <tt>transparent_union</tt>, <tt>unused</tt>,
Misha Brukman8395d732003-12-12 04:37:31 +0000[diff] [blame]415 <tt>deprecated</tt>, <tt>may_alias</tt><br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]416
417 <b>Unsupported:</b> <tt>aligned</tt>, <tt>packed</tt>,
418 all target specific attributes.</li>
419
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]420 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html#Other%20Builtins">Other Builtins</a>:
421 Other built-in functions.<br>
422 We support all builtins which have a C language equivalent (e.g.,
423 <tt>__builtin_cos</tt>), <tt>__builtin_alloca</tt>,
424 <tt>__builtin_types_compatible_p</tt>, <tt>__builtin_choose_expr</tt>,
Chris Lattnerb7c4bac2004-06-18 06:26:29 +0000[diff] [blame]425 <tt>__builtin_constant_p</tt>, and <tt>__builtin_expect</tt>
426 (currently ignored). We also support builtins for ISO C99 floating
427 point comparison macros (e.g., <tt>__builtin_islessequal</tt>).</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]428 </ol>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]429
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]430 <p>The following extensions <b>are</b> known to be supported:</p>
431
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]432 <ol>
Chris Lattnerd3dc8502004-03-16 08:54:07 +0000[diff] [blame]433 <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]434 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html#Statement%20Exprs">Statement Exprs</a>: Putting statements and declarations inside expressions.</li>
435 <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]436 <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]437 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Conditionals.html#Conditionals">Conditionals</a>: Omitting the middle operand of a <code>?:</code> expression.</li>
438 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Long-Long.html#Long%20Long">Long Long</a>: Double-word integers.</li>
439 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Complex.html#Complex">Complex</a>: Data types for complex numbers.</li>
440 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Hex-Floats.html#Hex%20Floats">Hex Floats</a>:Hexadecimal floating-point constants.</li>
441 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html#Zero%20Length">Zero Length</a>: Zero-length arrays.</li>
442 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Empty-Structures.html#Empty%20Structures">Empty Structures</a>: Structures with no members.</li>
443 <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>
444 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Escaped-Newlines.html#Escaped%20Newlines">Escaped Newlines</a>: Slightly looser rules for escaped newlines.</li>
445 <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]446 <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]447 <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]448 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Compound-Literals.html#Compound%20Literals">Compound Literals</a>: Compound literals give structures, unions,
449or arrays as values.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]450 <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]451 <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]452 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Case-Ranges.html#Case%20Ranges">Case Ranges</a>: `case 1 ... 9' and such.</li>
453 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Mixed-Declarations.html#Mixed%20Declarations">Mixed Declarations</a>: Mixing declarations and code.</li>
454 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Function-Prototypes.html#Function%20Prototypes">Function Prototypes</a>: Prototype declarations and old-style definitions.</li>
455 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/C---Comments.html#C++%20Comments">C++ Comments</a>: C++ comments are recognized.</li>
456 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Dollar-Signs.html#Dollar%20Signs">Dollar Signs</a>: Dollar sign is allowed in identifiers.</li>
457 <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>
458 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Alignment.html#Alignment">Alignment</a>: Inquiring about the alignment of a type or variable.</li>
459 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Inline.html#Inline">Inline</a>: Defining inline functions (as fast as macros).</li>
460 <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>
461 <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>
462 <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]463 <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]464 <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>
465 <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]466 </ol></li>
467
468</ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]469
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]470<p>If you run into GCC extensions which have not been included in any of these
471lists, please let us know (also including whether or not they work).</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]472
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]473</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]474
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]475<!-- ======================================================================= -->
476<div class="doc_subsection">
477 <a name="c++-fe">Known problems with the C++ front-end</a>
478</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]479
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]480<div class="doc_text">
481
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]482<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]483has not been tested as thoroughly as the C front-end. It has been tested and
484works for a number of non-trivial programs, but there may be lurking bugs.
485Please report any bugs or problems.</p>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]486
487</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]488
489<!-- _______________________________________________________________________ -->
Chris Lattner141ebb62004-02-14 04:12:41 +0000[diff] [blame]490<div class="doc_subsubsection">Bugs</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]491
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]492<div class="doc_text">
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]493
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]494<ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]495<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]496 front-end</a>.</li>
Chris Lattner041e6c92004-07-17 02:04:41 +0000[diff] [blame]497
Chris Lattner5cd40922004-08-02 20:28:44 +0000[diff] [blame]498<li><b>IA-64 specific</b>: The C++ front-end does not use <a
499href="http://llvm.cs.uiuc.edu/PR406">IA64 ABI compliant layout of v-tables</a>.
Chris Lattner041e6c92004-07-17 02:04:41 +0000[diff] [blame]500In particular, it just stores function pointers instead of function
501descriptors in the vtable. This bug prevents mixing C++ code compiled with
Chris Lattner2fd93492004-08-02 20:29:51 +0000[diff] [blame]502LLVM with C++ objects compiled by other C++ compilers.</li>
Chris Lattner041e6c92004-07-17 02:04:41 +0000[diff] [blame]503
Chris Lattner5cd40922004-08-02 20:28:44 +0000[diff] [blame]504</ul>
505
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]506</div>
507
508<!-- _______________________________________________________________________ -->
509<div class="doc_subsubsection">
510 Notes
511</div>
512
513<div class="doc_text">
514
515<ul>
Chris Lattnerd2a74272003-10-27 18:30:37 +0000[diff] [blame]516
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]517<li>The C++ front-end is based on a pre-release of the GCC 3.4 C++ parser. This
518parser is significantly more standards compliant (and picky) than prior GCC
519versions. For more information, see the C++ section of the <a
Chris Lattnere76e9ab2003-12-12 04:25:33 +0000[diff] [blame]520href="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]521
522<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]523 performed. In particular, destructors for objects in the <tt>longjmp</tt>ing
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]524 function and in the <tt>setjmp</tt> receiver function may not be run.
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]525 Objects in intervening stack frames will be destroyed, however (which is
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]526 better than most compilers).</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]527
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]528<li>The LLVM C++ front-end follows the <a
529 href="http://www.codesourcery.com/cxx-abi">Itanium C++ ABI</a>.
530 This document, which is not Itanium specific, specifies a standard for name
531 mangling, class layout, v-table layout, RTTI formats, and other C++
532 representation issues. Because we use this API, code generated by the LLVM
533 compilers should be binary compatible with machine code generated by other
534 Itanium ABI C++ compilers (such as G++, the Intel and HP compilers, etc).
535 <i>However</i>, the exception handling mechanism used by LLVM is very
536 different from the model used in the Itanium ABI, so <b>exceptions will not
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]537 interact correctly</b>. </li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]538
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]539</ul>
Chris Lattner46ecf612003-10-07 22:14:37 +0000[diff] [blame]540
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]541</div>
542
543<!-- ======================================================================= -->
544<div class="doc_subsection">
545 <a name="x86-be">Known problems with the X86 back-end</a>
546</div>
547
548<div class="doc_text">
549
550<ul>
Chris Lattner5cd40922004-08-02 20:28:44 +0000[diff] [blame]551 <li>none yet</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]552</ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]553
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]554</div>
555
556<!-- ======================================================================= -->
557<div class="doc_subsection">
Misha Brukmana516e992004-07-12 16:55:41 +0000[diff] [blame]558 <a name="sparcv9-be">Known problems with the SparcV9 back-end</a>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]559</div>
560
561<div class="doc_text">
562
563<ul>
Misha Brukmana516e992004-07-12 16:55:41 +0000[diff] [blame]564<li><a href="http://llvm.cs.uiuc.edu/PR60">[sparcv9] SparcV9 backend miscompiles
565several programs in the LLVM test suite</a></li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]566</ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]567
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]568</div>
569
570<!-- ======================================================================= -->
571<div class="doc_subsection">
572 <a name="c-be">Known problems with the C back-end</a>
573</div>
574
575<div class="doc_text">
576
577<ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]578
579<li>The C back-end produces code that violates the ANSI C Type-Based Alias
580Analysis rules. As such, special options may be necessary to compile the code
581(for example, GCC requires the <tt>-fno-strict-aliasing</tt> option). This
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]582problem probably cannot be fixed.</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]583
Chris Lattnera623e482003-10-20 19:05:03 +0000[diff] [blame]584<li><a href="http://llvm.cs.uiuc.edu/PR33">Initializers for global variables</a>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]585cannot include special floating point numbers like Not-A-Number or
586Infinity.</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]587
Chris Lattnerc679fbb2003-11-04 20:06:53 +0000[diff] [blame]588<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]589supported</a>. This should not affect LLVM produced by the C or C++
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]590frontends.</li>
Chris Lattnerb28c3282003-10-24 04:03:19 +0000[diff] [blame]591
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]592</ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]593
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]594</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]595
596<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]597<div class="doc_section">
598 <a name="additionalinfo">Additional Information</a>
599</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]600<!-- *********************************************************************** -->
601
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]602<div class="doc_text">
603
604<p>A wide variety of additional information is available on the LLVM web page,
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]605including mailing lists and publications describing algorithms and components
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]606implemented in LLVM. The web page also contains versions of the API
607documentation which is up-to-date with the CVS version of the source code. You
608can access versions of these documents specific to this release by going into
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]609the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]610
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]611<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]612us via the <a href="http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev">mailing
613lists</a>.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]614
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]615</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]616
617<!-- *********************************************************************** -->
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]618
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]619<hr>
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]620<address>
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625
Misha Brukman7cb4e382003-11-22 01:00:11 +0000[diff] [blame]626 <a href="http://llvm.cs.uiuc.edu">The LLVM Compiler Infrastructure</a><br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]627 Last modified: $Date$
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]628</address>
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Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]630</body>
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