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gerrit-public.fairphone.software / fp2-dev / platform / external / llvm / 38eeb15ad402a90831d42820e619c4298f6505a9 / . / docs / ReleaseNotes.html
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6 <title>LLVM 1.1 Release Notes</title>
7</head>
8<body>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]9
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]10<div class="doc_title">
11 LLVM 1.1 Release Notes
12</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]13
14<ol>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]15 <li><a href="#intro">Introduction</a></li>
16 <li><a href="#whatsnew">What's New?</a></li>
17 <li><a href="#portability">Portability and Supported Platforms</a></li>
18 <li><a href="#install-instructions">Installation Instructions</a></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]19 <li><a href="#knownproblems">Known Problems</a>
20 <ul>
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]21<!-- <li><a href="#portabilityprobs">Portability Problems</a> -->
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]22 <li><a href="#core">Known problems with the LLVM Core</a>
23 <li><a href="#c-fe">Known problems with the C Front-end</a>
24 <li><a href="#c++-fe">Known problems with the C++ Front-end</a>
25 <li><a href="#x86-be">Known problems with the X86 Back-end</a>
26 <li><a href="#sparc-be">Known problems with the Sparc Back-end</a>
27 <li><a href="#c-be">Known problems with the C back-end</a>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]28 </ul></li>
29 <li><a href="#additionalinfo">Additional Information</a></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]30</ol>
31
Misha Brukmane0c891c2003-11-22 01:00:11 +0000[diff] [blame]32<div class="doc_text">
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]33 <p><b>Written by <a href="mailto:sabre@nondot.org">Chris Lattner</a></b><p>
34</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]35
36<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]37<div class="doc_section">
38 <a name="intro">Introduction</a>
39</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]40<!-- *********************************************************************** -->
41
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]42<div class="doc_text">
43
44<p>This document contains the release notes for the LLVM compiler
45infrastructure, release 1.1. Here we describe the status of LLVM, including any
46known problems, and bug fixes from the previous release. The most up-to-date
47version of this document can be found on the <a
Chris Lattner12d90632003-10-27 01:31:14 +0000[diff] [blame]48href="http://llvm.cs.uiuc.edu/releases/1.1/">LLVM 1.1 web site</a>. If you are
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]49not reading this on the LLVM web pages, you should probably go there, because
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]50this document may be updated after the release.</p>
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]51
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]52<p>For more information about LLVM, including information about potentially more
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]53current releases, please check out the <a href="http://llvm.cs.uiuc.edu">main
54web site</a>. If you have questions or comments, the <a
55href="http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVM developer's mailing
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]56list</a> is a good place to send them.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]57
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]58<p>Note that if you are reading this file from CVS, that this document applies
59to the <i>next</i> release, not the previous one. To see the release notes for
60the previous release, see the <a
61href="http://llvm.cs.uiuc.edu/releases/">releases page</a>.</p>
62
63</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]64
65<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]66<div class="doc_section">
67 <a name="whatsnew">What's New?</a>
68</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]69<!-- *********************************************************************** -->
70
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]71<div class="doc_text">
72
73<p>This is the second public release of the LLVM compiler infrastructure. This
74release implements the following new features:</p>
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]75
76<ol>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]77<li><a
Chris Lattner55ee0312003-11-19 22:05:38 +0000[diff] [blame]78href="http://mail.cs.uiuc.edu/pipermail/llvmdev/2003-November/000528.html">A new
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]79LLVM profiler, similar to gprof</a> is available</li>
Chris Lattner0ef19062003-11-08 04:28:55 +0000[diff] [blame]80
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]81<li>LLVM and the C/C++ front-end now compile on Mac OSX! Mac OSX users can
Chris Lattner55ee0312003-11-19 22:05:38 +0000[diff] [blame]82now explore the LLVM optimizer with the C backend (note that LLVM requires GCC
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]833.3 on Mac OSX).</li>
Chris Lattner0ef19062003-11-08 04:28:55 +0000[diff] [blame]84
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]85<li>LLVM has been <a
Chris Lattner2a77f2d2003-11-11 23:46:35 +0000[diff] [blame]86href="http://mail.cs.uiuc.edu/pipermail/llvmdev/2003-November/000554.html">moved
87into an 'llvm' C++ namespace</a>, for easier integration with third-party
Misha Brukmane0c891c2003-11-22 01:00:11 +0000[diff] [blame]88code. Note that due to a bug in GDB 5.x, to debug namespacified LLVM code,
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]89you will need to upgrade to GDB 6.</li>
Chris Lattner55ee0312003-11-19 22:05:38 +0000[diff] [blame]90</ol>
Chris Lattner0ef19062003-11-08 04:28:55 +0000[diff] [blame]91
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]92<p>In this release, the following missing features were implemented:</p>
Chris Lattner0ef19062003-11-08 04:28:55 +0000[diff] [blame]93
94<ol>
95<li><a href="http://llvm.cs.uiuc.edu/PR88">The interpreter does not support
96invoke or unwind</a></li>
Misha Brukmanc99037d2003-11-14 03:30:43 +0000[diff] [blame]97
98<li><a href="http://llvm.cs.uiuc.edu/PR99">Interpreter does not support the
Chris Lattner55ee0312003-11-19 22:05:38 +0000[diff] [blame]99<tt>vaarg</tt> instruction</a></li>
Misha Brukmanc99037d2003-11-14 03:30:43 +0000[diff] [blame]100
Brian Gaekeb7508ee2003-11-16 23:49:26 +0000[diff] [blame]101<li><a href="http://llvm.cs.uiuc.edu/PR117">llvm-nm cannot read archive
Chris Lattner55ee0312003-11-19 22:05:38 +0000[diff] [blame]102files</a></li>
Brian Gaekeb7508ee2003-11-16 23:49:26 +0000[diff] [blame]103
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]104</ol>
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]105
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]106<p>In this release, the following Quality of Implementation issues were
107fixed:</p>
Chris Lattner89ca2b82003-10-27 17:06:39 +0000[diff] [blame]108
109<ol>
Chris Lattner0ef19062003-11-08 04:28:55 +0000[diff] [blame]110
111<li><a href="http://llvm.cs.uiuc.edu/PR29">C++ front-end is not generating
112linkonce linkage type when it can</a></li>
113
114<li><a href="http://llvm.cs.uiuc.edu/PR84">C front-end doesn't emit
115getelementptr for address of array element</a></li>
116
Chris Lattnerba46d552003-11-16 20:25:24 +0000[diff] [blame]117<li><a href="http://llvm.cs.uiuc.edu/PR96">Bad path to the C/C++ frontend causes
118build problems</a></li>
119
120<li><a href="http://llvm.cs.uiuc.edu/PR114">LLVM header files should be -Wold-style-cast clean</a></li>
121
Chris Lattner55ee0312003-11-19 22:05:38 +0000[diff] [blame]122<li>The LLVM bytecode reader has been <a
123href="http://llvm.cs.uiuc.edu/PR127">sped up a lot</a> (up to 4x in some
124cases).</li>
125
Chris Lattner9f9d00a2003-11-22 01:14:58 +0000[diff] [blame]126<li>Methods and functions in anonymous namespaces <a href="http://llvm.cs.uiuc.edu/PR85">now get internal linkage</a>.</li>
127
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]128</ol>
Chris Lattner89ca2b82003-10-27 17:06:39 +0000[diff] [blame]129
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]130<p>In this release, the following bugs in the previous release were fixed:</p>
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]131
132<ol>
Chris Lattnerf7100202003-10-27 05:41:39 +0000[diff] [blame]133<li><a href="http://llvm.cs.uiuc.edu/PR57">[inliner] Inlining invoke with PHI in unwind target is broken</a></li>
Chris Lattner89ca2b82003-10-27 17:06:39 +0000[diff] [blame]134<li><a href="http://llvm.cs.uiuc.edu/PR58">[linker] linkonce globals should link successfully to external globals</a></li>
Chris Lattner4ad4b3a2003-10-27 17:58:57 +0000[diff] [blame]135<li><a href="http://llvm.cs.uiuc.edu/PR59">C++ frontend can crash when compiling virtual base classes</a></li>
Chris Lattner2c17a892003-10-28 23:13:03 +0000[diff] [blame]136<li><a href="http://llvm.cs.uiuc.edu/PR62">C backend fails on constant cast expr to ptr-to-anonymous struct</a></li>
Chris Lattner287b6212003-10-29 01:26:07 +0000[diff] [blame]137<li><a href="http://llvm.cs.uiuc.edu/PR63">#ident is not recognized by C frontend</a></li>
Chris Lattner32547fe2003-10-29 07:17:13 +0000[diff] [blame]138<li><a href="http://llvm.cs.uiuc.edu/PR64">[constmerge] Constant merging pass merges constants with external linkage</a></li>
139<li><a href="http://llvm.cs.uiuc.edu/PR65">C front-end miscompiles the builtin_expect intrinsic!</a></li>
Chris Lattner34790e52003-10-29 18:49:14 +0000[diff] [blame]140<li><a href="http://llvm.cs.uiuc.edu/PR66">[scalarrepl] Scalar Replacement of aggregates is decimating structures it shouldn't be</a></li>
141<li><a href="http://llvm.cs.uiuc.edu/PR67">1.0 precompiled libstdc++ does not include wchar_t support</a></li>
Chris Lattner05b958d2003-10-29 20:59:45 +0000[diff] [blame]142<li><a href="http://llvm.cs.uiuc.edu/PR68">llvmgcc asserts when compiling functions renamed with asm's</a></li>
143<li><a href="http://llvm.cs.uiuc.edu/PR69">C frontend crashes on some programs with lots of types.</a></li>
Chris Lattner36bd5d12003-10-30 01:20:42 +0000[diff] [blame]144<li><a href="http://llvm.cs.uiuc.edu/PR70">[instcombine] Resolving invoke inserts cast after terminator</a></li>
Chris Lattnerf9e8a0f2003-10-30 01:43:33 +0000[diff] [blame]145<li><a href="http://llvm.cs.uiuc.edu/PR71">llvm-as crashes when labels are used in phi nodes</a></li>
Chris Lattner3dcc7b92003-10-30 16:20:15 +0000[diff] [blame]146<li><a href="http://llvm.cs.uiuc.edu/PR72">[build problem] Callgraph.cpp not pulled in from libipa.a</a></li>
Chris Lattner3af47222003-11-16 22:11:42 +0000[diff] [blame]147<li><a href="http://llvm.cs.uiuc.edu/PR77">Variables in scope of output setjmp
148calls should be volatile</a>. Note that this does not effect correctness on
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]149many platforms, such as X86.</li>
Chris Lattner8222eca2003-11-02 02:15:11 +0000[diff] [blame]150<li><a href="http://llvm.cs.uiuc.edu/PR79">llvm-gcc crashes compiling global union initializer</a></li>
151<li><a href="http://llvm.cs.uiuc.edu/PR80">C front-end crash on empty structure</a></li>
152<li><a href="http://llvm.cs.uiuc.edu/PR81">CFrontend crashes when compiling C99 compound expressions</a></li>
Chris Lattner2fb1ef82003-11-03 20:08:08 +0000[diff] [blame]153<li><a href="http://llvm.cs.uiuc.edu/PR83">[X86] Emission of global bool initializers broken</a></li>
Chris Lattner2855ecd2003-11-04 20:06:53 +0000[diff] [blame]154<li><a href="http://llvm.cs.uiuc.edu/PR87">llvm-gcc infinite loops on "case MAXINT:"</a></li>
Chris Lattnerde3bb572003-11-05 06:30:04 +0000[diff] [blame]155<li><a href="http://llvm.cs.uiuc.edu/PR89">[C++] Catch blocks make unparsable labels</a></li>
156<li><a href="http://llvm.cs.uiuc.edu/PR90">[C++] Initializing array with constructable objects fail</a></li>
157<li><a href="http://llvm.cs.uiuc.edu/PR91">[gccld] The -r (relinking) option does not work correctly</a></li>
Chris Lattner5b3fb032003-11-07 04:46:56 +0000[diff] [blame]158<li><a href="http://llvm.cs.uiuc.edu/PR92">[bcreader] Cannot read shift constant expressions from bytecode file</a></li>
159<li><a href="http://llvm.cs.uiuc.edu/PR93">[lowersetjmp] Lowersetjmp pass breaks dominance properties!</a></li>
160<li><a href="http://llvm.cs.uiuc.edu/PR94">llvm-gcc tries to add bools</a></li>
Chris Lattner11dde852003-11-09 19:44:07 +0000[diff] [blame]161<li><a href="http://llvm.cs.uiuc.edu/PR95">SymbolTable::getUniqueName is very inefficient</a></li>
Chris Lattner5b3fb032003-11-07 04:46:56 +0000[diff] [blame]162<li><a href="http://llvm.cs.uiuc.edu/PR98">[buildscripts] Building into objdir with .o in it fails</a></li>
Chris Lattner7af4d5e2003-11-08 05:18:50 +0000[diff] [blame]163<li><a href="http://llvm.cs.uiuc.edu/PR101">[setjmp/longjmp] Linking C programs which use setjmp/longjmp sometimes fail with references to the C++ runtime library!</a></li>
Chris Lattner11dde852003-11-09 19:44:07 +0000[diff] [blame]164<li><a href="http://llvm.cs.uiuc.edu/PR104">[c++] C++ Frontend lays out superclasses like anonymous bitfields!</a></li>
Chris Lattner9b29bde2003-11-12 04:42:37 +0000[diff] [blame]165<li><a href="http://llvm.cs.uiuc.edu/PR107">AsmParser Misses Symbol Redefinition Error</a></li>
Brian Gaeke78792062003-11-11 21:52:34 +0000[diff] [blame]166<li><a href="http://llvm.cs.uiuc.edu/PR108">gccld -Lfoo -lfoo fails to find ./foo/libfoo.a</a></li>
Chris Lattner6e4046f2003-11-14 06:42:01 +0000[diff] [blame]167<li><a href="http://llvm.cs.uiuc.edu/PR110">[bcreader] Incorrect cast causes misread forward constant references</a></li>
Brian Gaeke502c4812003-11-12 22:48:52 +0000[diff] [blame]168<li><a href="http://llvm.cs.uiuc.edu/PR112">Casting a string constant to void crashes llvm-gcc</a></li>
Chris Lattner5edc1bb2003-11-16 21:42:48 +0000[diff] [blame]169<li><a href="http://llvm.cs.uiuc.edu/PR116">[adce] ADCE considers blocks without postdominators to be unreachable</a></li>
Chris Lattner17a51ce2003-11-18 06:25:05 +0000[diff] [blame]170<li><a href="http://llvm.cs.uiuc.edu/PR54">C front-end miscompiles unsigned enums whose LLVM types are signed</a></li>
Chris Lattner43a54cc2003-11-18 23:04:02 +0000[diff] [blame]171<li><a href="http://llvm.cs.uiuc.edu/PR123">[X86] div and rem constant exprs invalidate iterators!</a></li>
172<li><a href="http://llvm.cs.uiuc.edu/PR125">[llvmg++] Enum types are incorrectly shrunk to smaller than 'int' size</a></li>
173<li><a href="http://llvm.cs.uiuc.edu/PR128">[llvmg++] Cannot use pointer to member to initialize global</a></li>
Chris Lattner6ff1a922003-11-19 01:08:24 +0000[diff] [blame]174<li><a href="http://llvm.cs.uiuc.edu/PR130">[vmcore] Symbol table doesn't rename colliding variables during type resolution</a></li>
175<li><a href="http://llvm.cs.uiuc.edu/PR131">[llvm-gcc] ?: operator as lvalue not implemented</a></li>
Chris Lattner55ee0312003-11-19 22:05:38 +0000[diff] [blame]176<li><a href="http://llvm.cs.uiuc.edu/PR133">[C/C++] Bogus warning about taking the address of 'register' variable</a></li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]177<li><a href="http://llvm.cs.uiuc.edu/PR97">bugpoint must not pass -R&lt;directory&gt; to Mach-O linker</a></li>
Chris Lattner18c4d852003-11-20 01:07:41 +0000[diff] [blame]178<li><a href="http://llvm.cs.uiuc.edu/PR113">crash assigning into an array in a struct which contains a bitfield</a>.</li>
179<li><a href="http://llvm.cs.uiuc.edu/PR6">Oversized integer bitfields cause crash</a></li>
Misha Brukman76683d32003-11-21 22:11:12 +0000[diff] [blame]180<li><a href="http://llvm.cs.uiuc.edu/PR140">gccld produces a runner script that includes command-line options to load the necessary shared objects</a></li>
Chris Lattnerfc592232003-11-20 19:11:47 +0000[diff] [blame]181<li><a href="http://llvm.cs.uiuc.edu/PR141">[llvm-gcc] Bitfields & large array don't mix well</a></li>
Chris Lattner6c024c4b2003-11-20 19:30:17 +0000[diff] [blame]182<li><a href="http://llvm.cs.uiuc.edu/PR132">[llvm-gcc] Complex division is not supported</a></li>
Chris Lattner5f36ebe2003-11-20 20:59:57 +0000[diff] [blame]183<li><a href="http://llvm.cs.uiuc.edu/PR143">[llvm-gcc] Illegal union field reference</a></li>
Chris Lattner38eeb152003-11-25 08:49:12 +0000[diff] [blame^]184<li><a href="http://llvm.cs.uiuc.edu/PR148">[llvmg++] Front-end attempts to return structure by value</a></li>
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]185</ol><p>
186
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]187<p>At this time, LLVM is known to work properly with SPEC CPU 2000 (X86 only),
188the Olden benchmarks, and the Ptrdist benchmarks among many other programs.
189Note however that the Sparc and X86 backends do not currently support exception
190throwing or long jumping (including 253.perlbmk in SPEC). For these programs,
191you must use the C backend.</p>
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]192
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]193</div>
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]194
195<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]196<div class="doc_section">
197 <a name="portability">Portability and Supported Platforms</a>
198</div>
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]199<!-- *********************************************************************** -->
200
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]201<div class="doc_text">
202
203<p>LLVM has been extensively tested on Intel and AMD machines running Red
Chris Lattner3e2959e2003-11-08 05:22:09 +0000[diff] [blame]204Hat Linux, and Sun UltraSPARC workstations running Solaris 8. Additionally,
205LLVM works on Mac OS/X 10.3 and above, but only with the C back-end (no native
206backend for the PowerPC is available yet).
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]207The core LLVM infrastructure uses "autoconf" for portability, so hopefully we
Chris Lattner3e2959e2003-11-08 05:22:09 +0000[diff] [blame]208work on more platforms than that. However, it is likely that we
209missed something, and that minor porting is required to get LLVM to work on
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]210new platforms. We welcome portability patches and error messages.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]211
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]212</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]213
214<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]215<div class="doc_section">
216 <a name="knownproblems">Known Problems</a>
217</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]218<!-- *********************************************************************** -->
219
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]220<div class="doc_text">
221
222<p>This section contains all known problems with the LLVM system, listed by
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]223component. As new problems are discovered, they will be added to these
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]224sections.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]225
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]226</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]227
228<!-- _______________________________________________________________________ -->
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]229<!--
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]230</ul><h4><a name="portability"><hr size=0>Portability Problems</h4><ul>
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]231-->
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]232
233
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]234<!-- ======================================================================= -->
235<div class="doc_subsection">
236 <a name="core">Known problems with the LLVM Core</a>
237</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]238
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]239<div class="doc_text">
240
241<ul>
242
243<li>In the JIT, <tt>dlsym</tt> on a symbol compiled by the JIT will not
244work.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]245
246<li>The JIT does not use mutexes to protect its internal data structures. As
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]247such, execution of a threaded program could cause these data structures to be
248corrupted.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]249
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]250<li>It is not possible to <tt>dlopen</tt> an LLVM bytecode file in the JIT.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]251
Chris Lattnere84843b2003-10-20 19:05:03 +0000[diff] [blame]252<li>Linking in static archive files (.a files) is very slow (there is no symbol
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]253table in the archive).</li>
Chris Lattner2855ecd2003-11-04 20:06:53 +0000[diff] [blame]254
Chris Lattner2855ecd2003-11-04 20:06:53 +0000[diff] [blame]255<li><a href="http://llvm.cs.uiuc.edu/PR82">LLVM cannot handle structures with
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]256more than 256 elements</a>.</li>
257
258</ul>
259
260</div>
261
262<!-- ======================================================================= -->
263<div class="doc_subsection">
264 <a name="c-fe">Known problems with the C front-end</a>
265</div>
Chris Lattner47588f92003-10-02 05:07:23 +0000[diff] [blame]266
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]267<!-- _______________________________________________________________________ -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]268<div class="doc_subsubsection">
269 Bugs
270</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]271
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]272<div class="doc_text">
273
274<ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]275
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]276<li>C99 Variable sized arrays do not release stack memory when they go out of
277 scope. Thus, the following program may run out of stack space:
278<pre>
279 for (i = 0; i != 1000000; ++i) {
280 int X[n];
281 foo(X);
282 }
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]283</pre></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]284
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]285</ul>
Chris Lattnere01fcfb2003-10-27 18:30:37 +0000[diff] [blame]286
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]287</div>
288
289<!-- _______________________________________________________________________ -->
290<div class="doc_subsubsection">
291 Notes
292</div>
293
294<div class="doc_text">
295
296<ul>
297
298<li>Inline assembly is not yet supported.</li>
Chris Lattnere01fcfb2003-10-27 18:30:37 +0000[diff] [blame]299
300<li>"long double" is transformed by the front-end into "double". There is no
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]301support for floating point data types of any size other than 32 and 64
302bits.</li>
303
304<li>The following Unix system functionality has not been tested and may not
305work:
Misha Brukmane0c891c2003-11-22 01:00:11 +0000[diff] [blame]306 <ol>
307 <li><tt>sigsetjmp</tt>, <tt>siglongjmp</tt> - These are not turned into the
308 appropriate <tt>invoke</tt>/<tt>unwind</tt> instructions. Note that
309 <tt>setjmp</tt> and <tt>longjmp</tt> <em>are</em> compiled correctly.
310 <li><tt>getcontext</tt>, <tt>setcontext</tt>, <tt>makecontext</tt>
311 - These functions have not been tested.
312 </ol></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]313
314<li>Although many GCC extensions are supported, some are not. In particular,
315 the following extensions are known to <b>not be</b> supported:
316 <ol>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]317 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Local-Labels.html#Local%20Labels">Local Labels</a>: Labels local to a block.</li>
318 <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>
319 <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>
320 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Constructing-Calls.html#Constructing%20Calls">Constructing Calls</a>: Dispatching a call to another function.</li>
321 <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>
322 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Constraints.html#Constraints">Constraints</a>: Constraints for asm operands</li>
323 <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>
324 <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>
325 <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>
326 <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>
327 <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>
328 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Thread-Local.html#Thread-Local">Thread-Local</a>: Per-thread variables.</li>
329 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Pragmas.html#Pragmas">Pragmas</a>: Pragmas accepted by GCC.</li>
Misha Brukmane0c891c2003-11-22 01:00:11 +0000[diff] [blame]330 </ol>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]331
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]332 <p>The following GCC extensions are <b>partially</b> supported. An ignored
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]333 attribute means that the LLVM compiler ignores the presence of the attribute,
334 but the code should still work. An unsupported attribute is one which is
335 ignored by the LLVM compiler, which will cause a different interpretation of
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]336 the program.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]337
338 <ol>
339 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Length.html#Variable%20Length">Variable Length</a>:
340 Arrays whose length is computed at run time.<br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]341 Supported, but allocated stack space is not freed until the function returns (noted above).</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]342
343 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html#Function%20Attributes">Function Attributes</a>:
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]344
345 Declaring that functions have no side effects, or that they can never
346 return.<br>
347
348 <b>Supported:</b> <tt>format</tt>, <tt>format_arg</tt>, <tt>non_null</tt>,
349 <tt>constructor</tt>, <tt>destructor</tt>, <tt>unused</tt>,
350 <tt>deprecated</tt>, <tt>warn_unused_result</tt>, <tt>weak</tt><br>
351
352 <b>Ignored:</b> <tt>noreturn</tt>, <tt>noinline</tt>,
353 <tt>always_inline</tt>, <tt>pure</tt>, <tt>const</tt>, <tt>nothrow</tt>,
354 <tt>malloc</tt>, <tt>no_instrument_function</tt>, <tt>cdecl</tt><br>
355
356 <b>Unsupported:</b> <tt>used</tt>, <tt>section</tt>, <tt>alias</tt>,
357 <tt>visibility</tt>, <tt>regparm</tt>, <tt>stdcall</tt>,
358 <tt>fastcall</tt>, all other target specific attributes</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]359
360 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Attributes.html#Variable%20Attributes">Variable Attributes</a>:
361 Specifying attributes of variables.<br>
362 <b>Supported:</b> <tt>cleanup</tt>, <tt>common</tt>, <tt>nocommon</tt>,
363 <tt>deprecated</tt>, <tt>transparent_union</tt>,
364 <tt>unused</tt>, <tt>weak</tt><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]365
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]366 <b>Unsupported:</b> <tt>aligned</tt>, <tt>mode</tt>, <tt>packed</tt>,
367 <tt>section</tt>, <tt>shared</tt>, <tt>tls_model</tt>,
368 <tt>vector_size</tt>, <tt>dllimport</tt>,
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]369 <tt>dllexport</tt>, all target specific attributes.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]370
371 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Type-Attributes.html#Type%20Attributes">Type Attributes</a>: Specifying attributes of types.
372 <b>Supported:</b> <tt>transparent_union</tt>, <tt>unused</tt>,
373 <tt>deprecated</tt>, <tt>may_alias</tt>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]374
375 <b>Unsupported:</b> <tt>aligned</tt>, <tt>packed</tt>,
376 all target specific attributes.</li>
377
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]378 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html#Other%20Builtins">Other Builtins</a>:
379 Other built-in functions.<br>
380 We support all builtins which have a C language equivalent (e.g.,
381 <tt>__builtin_cos</tt>), <tt>__builtin_alloca</tt>,
382 <tt>__builtin_types_compatible_p</tt>, <tt>__builtin_choose_expr</tt>,
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]383 <tt>__builtin_constant_p</tt>, and <tt>__builtin_expect</tt> (ignored).</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]384
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]385 </ol>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]386
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]387 <p>The following extensions <b>are</b> known to be supported:</p>
388
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]389 <ol>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]390 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html#Statement%20Exprs">Statement Exprs</a>: Putting statements and declarations inside expressions.</li>
391 <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>
392 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Lvalues.html#Lvalues">Lvalues</a>: Using <code>?:</code>, "<code>,</code>" and casts in lvalues.</li>
393 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Conditionals.html#Conditionals">Conditionals</a>: Omitting the middle operand of a <code>?:</code> expression.</li>
394 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Long-Long.html#Long%20Long">Long Long</a>: Double-word integers.</li>
395 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Complex.html#Complex">Complex</a>: Data types for complex numbers.</li>
396 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Hex-Floats.html#Hex%20Floats">Hex Floats</a>:Hexadecimal floating-point constants.</li>
397 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html#Zero%20Length">Zero Length</a>: Zero-length arrays.</li>
398 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Empty-Structures.html#Empty%20Structures">Empty Structures</a>: Structures with no members.</li>
399 <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>
400 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Escaped-Newlines.html#Escaped%20Newlines">Escaped Newlines</a>: Slightly looser rules for escaped newlines.</li>
401 <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>
402 <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>
403 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Initializers.html#Initializers">Initializers</a>: Non-constant initializers.</li>
404 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Compound-Literals.html#Compound%20Literals">Compound Literals</a>: Compound literals give structures, unions or arrays as values.</li>
405 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Designated-Inits.html#Designated%20Inits">Designated Inits</a>: Labeling elements of initializers.</li>
406 <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>
407 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Case-Ranges.html#Case%20Ranges">Case Ranges</a>: `case 1 ... 9' and such.</li>
408 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Mixed-Declarations.html#Mixed%20Declarations">Mixed Declarations</a>: Mixing declarations and code.</li>
409 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Function-Prototypes.html#Function%20Prototypes">Function Prototypes</a>: Prototype declarations and old-style definitions.</li>
410 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/C---Comments.html#C++%20Comments">C++ Comments</a>: C++ comments are recognized.</li>
411 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Dollar-Signs.html#Dollar%20Signs">Dollar Signs</a>: Dollar sign is allowed in identifiers.</li>
412 <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>
413 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Alignment.html#Alignment">Alignment</a>: Inquiring about the alignment of a type or variable.</li>
414 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Inline.html#Inline">Inline</a>: Defining inline functions (as fast as macros).</li>
415 <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>
416 <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>
417 <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>
418 <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>
419 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Attribute-Syntax.html#Attribute%20Syntax">Attribute Syntax</a>: Formal syntax for attributes.</li>
Misha Brukmane0c891c2003-11-22 01:00:11 +0000[diff] [blame]420 </ol></li>
421
422</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]423
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]424<p>If you run into GCC extensions which have not been included in any of these
425lists, please let us know (also including whether or not they work).</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]426
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]427</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]428
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]429<!-- ======================================================================= -->
430<div class="doc_subsection">
431 <a name="c++-fe">Known problems with the C++ front-end</a>
432</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]433
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]434<div class="doc_text">
435
436<p>For this release, the C++ front-end is considered to be fully functional but
437of <b>beta</b> quality. It has been tested and works for a number of simple
438programs that collectively exercise most of the language. Nevertheless, it has
439not been in use as long as the C front-end. Please report any bugs or
440problems.</p>
441
442</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]443
444<!-- _______________________________________________________________________ -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]445<div class="doc_subsubsection">
446 Bugs
447</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]448
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]449<div class="doc_text">
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]450
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]451<ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]452<li>The C++ front-end inherits all problems afflicting the <a href="#c-fe">C
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]453 front-end</a></li>
454</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]455
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]456</div>
457
458<!-- _______________________________________________________________________ -->
459<div class="doc_subsubsection">
460 Notes
461</div>
462
463<div class="doc_text">
464
465<ul>
Chris Lattnere01fcfb2003-10-27 18:30:37 +0000[diff] [blame]466
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]467<li>The C++ front-end is based on a pre-release of the GCC 3.4 C++ parser. This
468parser is significantly more standards compliant (and picky) than prior GCC
469versions. For more information, see the C++ section of the <a
470href="http://gcc.gnu.org/gcc-3.4/changes.html">GCC 3.4 release notes</a>.<p>
471
472<li>Destructors for local objects are not always run when a <tt>longjmp</tt> is
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]473 performed. In particular, destructors for objects in the <tt>longjmp</tt>ing
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]474 function and in the <tt>setjmp</tt> receiver function may not be run.
475 Objects in intervening stack frames will be destroyed however (which is
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]476 better than most compilers).</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]477
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]478<li>The LLVM C++ front-end follows the <a
479 href="http://www.codesourcery.com/cxx-abi">Itanium C++ ABI</a>.
480 This document, which is not Itanium specific, specifies a standard for name
481 mangling, class layout, v-table layout, RTTI formats, and other C++
482 representation issues. Because we use this API, code generated by the LLVM
483 compilers should be binary compatible with machine code generated by other
484 Itanium ABI C++ compilers (such as G++, the Intel and HP compilers, etc).
485 <i>However</i>, the exception handling mechanism used by LLVM is very
486 different from the model used in the Itanium ABI, so <b>exceptions will not
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]487 interact correctly</b>. </li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]488
Chris Lattnere01fcfb2003-10-27 18:30:37 +0000[diff] [blame]489<li><a href="http://llvm.cs.uiuc.edu/PR11">Code for executing destructors when
490 unwinding is not shared</a> (this is a quality of implementation problem,
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]491 which does not effect functionality).</li>
Chris Lattnerfcc54b32003-10-07 22:14:37 +0000[diff] [blame]492
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]493</ul>
Chris Lattnerfcc54b32003-10-07 22:14:37 +0000[diff] [blame]494
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]495</div>
496
497<!-- ======================================================================= -->
498<div class="doc_subsection">
499 <a name="x86-be">Known problems with the X86 back-end</a>
500</div>
501
502<div class="doc_text">
503
504<ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]505
Chris Lattnerfcc54b32003-10-07 22:14:37 +0000[diff] [blame]506<li>The X86 code generator <a
Chris Lattner0d4379a2003-10-08 06:01:38 +0000[diff] [blame]507href="http://llvm.cs.uiuc.edu/PR16">does not currently
Chris Lattnerfcc54b32003-10-07 22:14:37 +0000[diff] [blame]508support the <tt>unwind</tt> instruction</a>, so code that throws a C++ exception
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]509or calls the C <tt>longjmp</tt> function will abort.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]510
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]511</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]512
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]513</div>
514
515<!-- ======================================================================= -->
516<div class="doc_subsection">
517 <a name="sparc-be">Known problems with the Sparc back-end</a>
518</div>
519
520<div class="doc_text">
521
522<ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]523
Chris Lattnerfcc54b32003-10-07 22:14:37 +0000[diff] [blame]524<li>The Sparc code generator <a
Chris Lattner0d4379a2003-10-08 06:01:38 +0000[diff] [blame]525href="http://llvm.cs.uiuc.edu/PR15">does not currently
Chris Lattnerfcc54b32003-10-07 22:14:37 +0000[diff] [blame]526support the <tt>unwind</tt> instruction</a>, so code that throws a C++ exception
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]527or calls the C <tt>longjmp</tt> function will abort.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]528
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]529</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]530
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]531</div>
532
533<!-- ======================================================================= -->
534<div class="doc_subsection">
535 <a name="c-be">Known problems with the C back-end</a>
536</div>
537
538<div class="doc_text">
539
540<ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]541
542<li>The C back-end produces code that violates the ANSI C Type-Based Alias
543Analysis rules. As such, special options may be necessary to compile the code
544(for example, GCC requires the <tt>-fno-strict-aliasing</tt> option). This
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]545problem probably cannot be fixed.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]546
Chris Lattnere84843b2003-10-20 19:05:03 +0000[diff] [blame]547<li><a href="http://llvm.cs.uiuc.edu/PR33">Initializers for global variables</a>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]548cannot include special floating point numbers like Not-A-Number or
549Infinity.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]550
Chris Lattner2855ecd2003-11-04 20:06:53 +0000[diff] [blame]551<li><a href="http://llvm.cs.uiuc.edu/PR56">Zero arg vararg functions are not
Chris Lattner2af46052003-10-24 04:03:19 +0000[diff] [blame]552supported</a>. This should not affect LLVM produced by the C or C++
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]553frontends.</li>
Chris Lattner2af46052003-10-24 04:03:19 +0000[diff] [blame]554
Chris Lattner2855ecd2003-11-04 20:06:53 +0000[diff] [blame]555<li>The code produces by the C back-end has only been tested with the Sun CC,
556GCC, and Intel compilers. It is possible that it will have to be adjusted to
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]557support other C compilers.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]558
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]559</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]560
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]561</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]562
563<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]564<div class="doc_section">
565 <a name="additionalinfo">Additional Information</a>
566</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]567<!-- *********************************************************************** -->
568
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]569<div class="doc_text">
570
571<p>A wide variety of additional information is available on the LLVM web page,
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]572including mailing lists publications describing algorithms and components
573implemented in LLVM. The web page also contains versions of the API
574documentation which is up-to-date with the CVS version of the source code. You
575can access versions of these documents specific to this release by going into
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]576the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]577
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]578<p>If you have any questions or comments about LLVM, please feel free to contact
579us via the mailing lists.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]580
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]581</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]582
583<!-- *********************************************************************** -->
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]584
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]585<hr>
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]586<address>
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Misha Brukmane0c891c2003-11-22 01:00:11 +0000[diff] [blame]592 <a href="http://llvm.cs.uiuc.edu">The LLVM Compiler Infrastructure</a><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]593 Last modified: $Date$
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]594</address>
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