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