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6 <title>LLVM 1.1 Release Notes</title>
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Chris Lattner79c3fe12003-10-02 04:57:28 +00009
Misha Brukman500bc302003-11-22 00:38:41 +000010<div class="doc_title">
11 LLVM 1.1 Release Notes
12</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +000013
14<ol>
Misha Brukman500bc302003-11-22 00:38:41 +000015 <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 +000019 <li><a href="#knownproblems">Known Problems</a>
20 <ul>
Chris Lattner19092612003-10-02 16:38:05 +000021<!-- <li><a href="#portabilityprobs">Portability Problems</a> -->
Chris Lattner79c3fe12003-10-02 04:57:28 +000022 <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 +000028 </ul></li>
29 <li><a href="#additionalinfo">Additional Information</a></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +000030</ol>
31
Misha Brukmane0c891c2003-11-22 01:00:11 +000032<div class="doc_text">
Misha Brukman500bc302003-11-22 00:38:41 +000033 <p><b>Written by <a href="mailto:sabre@nondot.org">Chris Lattner</a></b><p>
34</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +000035
36<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +000037<div class="doc_section">
38 <a name="intro">Introduction</a>
39</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +000040<!-- *********************************************************************** -->
41
Misha Brukman500bc302003-11-22 00:38:41 +000042<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 +000048href="http://llvm.cs.uiuc.edu/releases/1.1/">LLVM 1.1 web site</a>. If you are
Chris Lattner47ad72c2003-10-07 21:38:31 +000049not reading this on the LLVM web pages, you should probably go there, because
Misha Brukman500bc302003-11-22 00:38:41 +000050this document may be updated after the release.</p>
Chris Lattner19092612003-10-02 16:38:05 +000051
Misha Brukman500bc302003-11-22 00:38:41 +000052<p>For more information about LLVM, including information about potentially more
Chris Lattner47ad72c2003-10-07 21:38:31 +000053current 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 +000056list</a> is a good place to send them.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +000057
Misha Brukman500bc302003-11-22 00:38:41 +000058<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 +000064
65<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +000066<div class="doc_section">
67 <a name="whatsnew">What's New?</a>
68</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +000069<!-- *********************************************************************** -->
70
Misha Brukman500bc302003-11-22 00:38:41 +000071<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 +000075
76<ol>
Misha Brukman500bc302003-11-22 00:38:41 +000077<li><a
Chris Lattner55ee0312003-11-19 22:05:38 +000078href="http://mail.cs.uiuc.edu/pipermail/llvmdev/2003-November/000528.html">A new
Misha Brukman500bc302003-11-22 00:38:41 +000079LLVM profiler, similar to gprof</a> is available</li>
Chris Lattner0ef19062003-11-08 04:28:55 +000080
Misha Brukman500bc302003-11-22 00:38:41 +000081<li>LLVM and the C/C++ front-end now compile on Mac OSX! Mac OSX users can
Chris Lattner55ee0312003-11-19 22:05:38 +000082now explore the LLVM optimizer with the C backend (note that LLVM requires GCC
Misha Brukman500bc302003-11-22 00:38:41 +0000833.3 on Mac OSX).</li>
Chris Lattner0ef19062003-11-08 04:28:55 +000084
Misha Brukman500bc302003-11-22 00:38:41 +000085<li>LLVM has been <a
Chris Lattner2a77f2d2003-11-11 23:46:35 +000086href="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 +000088code. Note that due to a bug in GDB 5.x, to debug namespacified LLVM code,
Misha Brukman500bc302003-11-22 00:38:41 +000089you will need to upgrade to GDB 6.</li>
John Criswellf2ec35b2003-11-26 20:09:49 +000090
91<li>
92The build system now copies Makefiles dynamically from the source tree to the
93object tree as subdirectories are built. This means that:
94 <ol>
95 <li>
96 New directories can be added to the source tree, and the build will
97 automatically pick them up (i.e. no need to re-run <tt>configure</tt>).
98 </li>
99
100 <li>
101 You will need to build LLVM from the top of the object tree once to ensure
102 that all of the Makefiles are copied into the object tree subdirectories.
103 </li>
104 </ol>
105</li>
106
107<li>
108The <tt>configure</tt> script will now configure all projects placed in the
109<tt>llvm/projects</tt> directory.
110</li>
Chris Lattner55ee0312003-11-19 22:05:38 +0000111</ol>
Chris Lattner0ef19062003-11-08 04:28:55 +0000112
Misha Brukman500bc302003-11-22 00:38:41 +0000113<p>In this release, the following missing features were implemented:</p>
Chris Lattner0ef19062003-11-08 04:28:55 +0000114
115<ol>
116<li><a href="http://llvm.cs.uiuc.edu/PR88">The interpreter does not support
117invoke or unwind</a></li>
Misha Brukmanc99037d2003-11-14 03:30:43 +0000118
119<li><a href="http://llvm.cs.uiuc.edu/PR99">Interpreter does not support the
Chris Lattner55ee0312003-11-19 22:05:38 +0000120<tt>vaarg</tt> instruction</a></li>
Misha Brukmanc99037d2003-11-14 03:30:43 +0000121
Brian Gaekeb7508ee2003-11-16 23:49:26 +0000122<li><a href="http://llvm.cs.uiuc.edu/PR117">llvm-nm cannot read archive
Chris Lattner55ee0312003-11-19 22:05:38 +0000123files</a></li>
Brian Gaekeb7508ee2003-11-16 23:49:26 +0000124
Misha Brukman500bc302003-11-22 00:38:41 +0000125</ol>
Chris Lattner47ad72c2003-10-07 21:38:31 +0000126
Misha Brukman500bc302003-11-22 00:38:41 +0000127<p>In this release, the following Quality of Implementation issues were
128fixed:</p>
Chris Lattner89ca2b82003-10-27 17:06:39 +0000129
130<ol>
Chris Lattner0ef19062003-11-08 04:28:55 +0000131
132<li><a href="http://llvm.cs.uiuc.edu/PR29">C++ front-end is not generating
133linkonce linkage type when it can</a></li>
134
135<li><a href="http://llvm.cs.uiuc.edu/PR84">C front-end doesn't emit
136getelementptr for address of array element</a></li>
137
Chris Lattnerba46d552003-11-16 20:25:24 +0000138<li><a href="http://llvm.cs.uiuc.edu/PR96">Bad path to the C/C++ frontend causes
139build problems</a></li>
140
141<li><a href="http://llvm.cs.uiuc.edu/PR114">LLVM header files should be -Wold-style-cast clean</a></li>
142
Chris Lattner55ee0312003-11-19 22:05:38 +0000143<li>The LLVM bytecode reader has been <a
144href="http://llvm.cs.uiuc.edu/PR127">sped up a lot</a> (up to 4x in some
145cases).</li>
146
Chris Lattner9f9d00a2003-11-22 01:14:58 +0000147<li>Methods and functions in anonymous namespaces <a href="http://llvm.cs.uiuc.edu/PR85">now get internal linkage</a>.</li>
148
Chris Lattnerf7330732003-11-26 08:20:34 +0000149<li>Constant initializers now generate loops instead of potentially <a href="http://llvm.cs.uiuc.edu/PR75">huge amounts of straight-line code</a>.</li>
150
Chris Lattner3074b342003-11-27 09:51:54 +0000151<li>Code for running C++ destructors is now properly shared when possible. Before, the C++ front-end
152<a href="http://llvm.cs.uiuc.edu/PR11">generated N^2 amounts of duplicated cleanup code</a> in some cases.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000153</ol>
Chris Lattner89ca2b82003-10-27 17:06:39 +0000154
Misha Brukman500bc302003-11-22 00:38:41 +0000155<p>In this release, the following bugs in the previous release were fixed:</p>
Chris Lattner47ad72c2003-10-07 21:38:31 +0000156
157<ol>
Chris Lattnerf7100202003-10-27 05:41:39 +0000158<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 +0000159<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 +0000160<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 +0000161<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 +0000162<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 +0000163<li><a href="http://llvm.cs.uiuc.edu/PR64">[constmerge] Constant merging pass merges constants with external linkage</a></li>
164<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 +0000165<li><a href="http://llvm.cs.uiuc.edu/PR66">[scalarrepl] Scalar Replacement of aggregates is decimating structures it shouldn't be</a></li>
166<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 +0000167<li><a href="http://llvm.cs.uiuc.edu/PR68">llvmgcc asserts when compiling functions renamed with asm's</a></li>
168<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 +0000169<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 +0000170<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 +0000171<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 +0000172<li><a href="http://llvm.cs.uiuc.edu/PR77">Variables in scope of output setjmp
173calls should be volatile</a>. Note that this does not effect correctness on
Misha Brukman500bc302003-11-22 00:38:41 +0000174many platforms, such as X86.</li>
Chris Lattner8222eca2003-11-02 02:15:11 +0000175<li><a href="http://llvm.cs.uiuc.edu/PR79">llvm-gcc crashes compiling global union initializer</a></li>
176<li><a href="http://llvm.cs.uiuc.edu/PR80">C front-end crash on empty structure</a></li>
177<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 +0000178<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 +0000179<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 +0000180<li><a href="http://llvm.cs.uiuc.edu/PR89">[C++] Catch blocks make unparsable labels</a></li>
181<li><a href="http://llvm.cs.uiuc.edu/PR90">[C++] Initializing array with constructable objects fail</a></li>
182<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 +0000183<li><a href="http://llvm.cs.uiuc.edu/PR92">[bcreader] Cannot read shift constant expressions from bytecode file</a></li>
184<li><a href="http://llvm.cs.uiuc.edu/PR93">[lowersetjmp] Lowersetjmp pass breaks dominance properties!</a></li>
185<li><a href="http://llvm.cs.uiuc.edu/PR94">llvm-gcc tries to add bools</a></li>
Chris Lattner11dde852003-11-09 19:44:07 +0000186<li><a href="http://llvm.cs.uiuc.edu/PR95">SymbolTable::getUniqueName is very inefficient</a></li>
Chris Lattner5b3fb032003-11-07 04:46:56 +0000187<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 +0000188<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 +0000189<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 +0000190<li><a href="http://llvm.cs.uiuc.edu/PR107">AsmParser Misses Symbol Redefinition Error</a></li>
Brian Gaeke78792062003-11-11 21:52:34 +0000191<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 +0000192<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 +0000193<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 +0000194<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 +0000195<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 +0000196<li><a href="http://llvm.cs.uiuc.edu/PR123">[X86] div and rem constant exprs invalidate iterators!</a></li>
197<li><a href="http://llvm.cs.uiuc.edu/PR125">[llvmg++] Enum types are incorrectly shrunk to smaller than 'int' size</a></li>
198<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 +0000199<li><a href="http://llvm.cs.uiuc.edu/PR130">[vmcore] Symbol table doesn't rename colliding variables during type resolution</a></li>
200<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 +0000201<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 +0000202<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 +0000203<li><a href="http://llvm.cs.uiuc.edu/PR113">crash assigning into an array in a struct which contains a bitfield</a>.</li>
204<li><a href="http://llvm.cs.uiuc.edu/PR6">Oversized integer bitfields cause crash</a></li>
Misha Brukman76683d32003-11-21 22:11:12 +0000205<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 Lattnerf7330732003-11-26 08:20:34 +0000206<li><a href="http://llvm.cs.uiuc.edu/PR141">[llvm-gcc] Bitfields &amp; large array don't mix well</a></li>
Chris Lattner6c024c4b2003-11-20 19:30:17 +0000207<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 +0000208<li><a href="http://llvm.cs.uiuc.edu/PR143">[llvm-gcc] Illegal union field reference</a></li>
Chris Lattner38eeb152003-11-25 08:49:12 +0000209<li><a href="http://llvm.cs.uiuc.edu/PR148">[llvmg++] Front-end attempts to return structure by value</a></li>
Chris Lattner676c2552003-11-26 01:18:49 +0000210<li><a href="http://llvm.cs.uiuc.edu/PR152">[llvmg++] Pointer to member initializers not supported in constructors</a></li>
211<li><a href="http://llvm.cs.uiuc.edu/PR155">[llvm-gcc] crash on union initialization</a></li>
Chris Lattner5b266582003-11-26 02:48:00 +0000212<li><a href="http://llvm.cs.uiuc.edu/PR124">[llvm-g++] ?: expressions do not run correct number of destructors!</a></li>
Chris Lattnerf7330732003-11-26 08:20:34 +0000213<li><a href="http://llvm.cs.uiuc.edu/PR157">[llvm-gcc] Pointer & constant results in invalid shift</a></li>
Chris Lattner47ad72c2003-10-07 21:38:31 +0000214</ol><p>
215
Misha Brukman500bc302003-11-22 00:38:41 +0000216<p>At this time, LLVM is known to work properly with SPEC CPU 2000 (X86 only),
217the Olden benchmarks, and the Ptrdist benchmarks among many other programs.
218Note however that the Sparc and X86 backends do not currently support exception
219throwing or long jumping (including 253.perlbmk in SPEC). For these programs,
220you must use the C backend.</p>
Chris Lattner19092612003-10-02 16:38:05 +0000221
Misha Brukman500bc302003-11-22 00:38:41 +0000222</div>
Chris Lattner19092612003-10-02 16:38:05 +0000223
224<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000225<div class="doc_section">
226 <a name="portability">Portability and Supported Platforms</a>
227</div>
Chris Lattner19092612003-10-02 16:38:05 +0000228<!-- *********************************************************************** -->
229
Misha Brukman500bc302003-11-22 00:38:41 +0000230<div class="doc_text">
231
232<p>LLVM has been extensively tested on Intel and AMD machines running Red
Chris Lattner3e2959e2003-11-08 05:22:09 +0000233Hat Linux, and Sun UltraSPARC workstations running Solaris 8. Additionally,
234LLVM works on Mac OS/X 10.3 and above, but only with the C back-end (no native
235backend for the PowerPC is available yet).
Chris Lattner19092612003-10-02 16:38:05 +0000236The core LLVM infrastructure uses "autoconf" for portability, so hopefully we
Chris Lattner3e2959e2003-11-08 05:22:09 +0000237work on more platforms than that. However, it is likely that we
238missed something, and that minor porting is required to get LLVM to work on
Misha Brukman500bc302003-11-22 00:38:41 +0000239new platforms. We welcome portability patches and error messages.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000240
Misha Brukman500bc302003-11-22 00:38:41 +0000241</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000242
243<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000244<div class="doc_section">
245 <a name="knownproblems">Known Problems</a>
246</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000247<!-- *********************************************************************** -->
248
Misha Brukman500bc302003-11-22 00:38:41 +0000249<div class="doc_text">
250
251<p>This section contains all known problems with the LLVM system, listed by
Chris Lattner79c3fe12003-10-02 04:57:28 +0000252component. As new problems are discovered, they will be added to these
Misha Brukman500bc302003-11-22 00:38:41 +0000253sections.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000254
Misha Brukman500bc302003-11-22 00:38:41 +0000255</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000256
257<!-- _______________________________________________________________________ -->
Chris Lattner19092612003-10-02 16:38:05 +0000258<!--
Chris Lattner79c3fe12003-10-02 04:57:28 +0000259</ul><h4><a name="portability"><hr size=0>Portability Problems</h4><ul>
Chris Lattner19092612003-10-02 16:38:05 +0000260-->
Chris Lattner79c3fe12003-10-02 04:57:28 +0000261
262
Misha Brukman500bc302003-11-22 00:38:41 +0000263<!-- ======================================================================= -->
264<div class="doc_subsection">
265 <a name="core">Known problems with the LLVM Core</a>
266</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000267
Misha Brukman500bc302003-11-22 00:38:41 +0000268<div class="doc_text">
269
270<ul>
271
272<li>In the JIT, <tt>dlsym</tt> on a symbol compiled by the JIT will not
273work.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000274
275<li>The JIT does not use mutexes to protect its internal data structures. As
Misha Brukman500bc302003-11-22 00:38:41 +0000276such, execution of a threaded program could cause these data structures to be
277corrupted.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000278
Misha Brukman500bc302003-11-22 00:38:41 +0000279<li>It is not possible to <tt>dlopen</tt> an LLVM bytecode file in the JIT.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000280
Chris Lattnere84843b2003-10-20 19:05:03 +0000281<li>Linking in static archive files (.a files) is very slow (there is no symbol
Misha Brukman500bc302003-11-22 00:38:41 +0000282table in the archive).</li>
Chris Lattner2855ecd2003-11-04 20:06:53 +0000283
Chris Lattner2855ecd2003-11-04 20:06:53 +0000284<li><a href="http://llvm.cs.uiuc.edu/PR82">LLVM cannot handle structures with
Misha Brukman500bc302003-11-22 00:38:41 +0000285more than 256 elements</a>.</li>
286
287</ul>
288
289</div>
290
291<!-- ======================================================================= -->
292<div class="doc_subsection">
293 <a name="c-fe">Known problems with the C front-end</a>
294</div>
Chris Lattner47588f92003-10-02 05:07:23 +0000295
Chris Lattner79c3fe12003-10-02 04:57:28 +0000296<!-- _______________________________________________________________________ -->
Misha Brukman500bc302003-11-22 00:38:41 +0000297<div class="doc_subsubsection">
298 Bugs
299</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000300
Misha Brukman500bc302003-11-22 00:38:41 +0000301<div class="doc_text">
302
303<ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000304
Chris Lattner79c3fe12003-10-02 04:57:28 +0000305<li>C99 Variable sized arrays do not release stack memory when they go out of
306 scope. Thus, the following program may run out of stack space:
307<pre>
308 for (i = 0; i != 1000000; ++i) {
309 int X[n];
310 foo(X);
311 }
Misha Brukman500bc302003-11-22 00:38:41 +0000312</pre></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000313
Misha Brukman500bc302003-11-22 00:38:41 +0000314</ul>
Chris Lattnere01fcfb2003-10-27 18:30:37 +0000315
Misha Brukman500bc302003-11-22 00:38:41 +0000316</div>
317
318<!-- _______________________________________________________________________ -->
319<div class="doc_subsubsection">
320 Notes
321</div>
322
323<div class="doc_text">
324
325<ul>
326
327<li>Inline assembly is not yet supported.</li>
Chris Lattnere01fcfb2003-10-27 18:30:37 +0000328
329<li>"long double" is transformed by the front-end into "double". There is no
Misha Brukman500bc302003-11-22 00:38:41 +0000330support for floating point data types of any size other than 32 and 64
331bits.</li>
332
333<li>The following Unix system functionality has not been tested and may not
334work:
Misha Brukmane0c891c2003-11-22 01:00:11 +0000335 <ol>
336 <li><tt>sigsetjmp</tt>, <tt>siglongjmp</tt> - These are not turned into the
337 appropriate <tt>invoke</tt>/<tt>unwind</tt> instructions. Note that
338 <tt>setjmp</tt> and <tt>longjmp</tt> <em>are</em> compiled correctly.
339 <li><tt>getcontext</tt>, <tt>setcontext</tt>, <tt>makecontext</tt>
340 - These functions have not been tested.
341 </ol></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000342
343<li>Although many GCC extensions are supported, some are not. In particular,
344 the following extensions are known to <b>not be</b> supported:
345 <ol>
Misha Brukman500bc302003-11-22 00:38:41 +0000346 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Local-Labels.html#Local%20Labels">Local Labels</a>: Labels local to a block.</li>
347 <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>
348 <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>
349 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Constructing-Calls.html#Constructing%20Calls">Constructing Calls</a>: Dispatching a call to another function.</li>
350 <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>
351 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Constraints.html#Constraints">Constraints</a>: Constraints for asm operands</li>
352 <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>
353 <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>
354 <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>
355 <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>
356 <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>
357 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Thread-Local.html#Thread-Local">Thread-Local</a>: Per-thread variables.</li>
358 <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 +0000359 </ol>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000360
Misha Brukman500bc302003-11-22 00:38:41 +0000361 <p>The following GCC extensions are <b>partially</b> supported. An ignored
Chris Lattner79c3fe12003-10-02 04:57:28 +0000362 attribute means that the LLVM compiler ignores the presence of the attribute,
363 but the code should still work. An unsupported attribute is one which is
364 ignored by the LLVM compiler, which will cause a different interpretation of
Misha Brukman500bc302003-11-22 00:38:41 +0000365 the program.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000366
367 <ol>
368 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Length.html#Variable%20Length">Variable Length</a>:
369 Arrays whose length is computed at run time.<br>
Misha Brukman500bc302003-11-22 00:38:41 +0000370 Supported, but allocated stack space is not freed until the function returns (noted above).</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000371
372 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html#Function%20Attributes">Function Attributes</a>:
Misha Brukman500bc302003-11-22 00:38:41 +0000373
374 Declaring that functions have no side effects, or that they can never
375 return.<br>
376
377 <b>Supported:</b> <tt>format</tt>, <tt>format_arg</tt>, <tt>non_null</tt>,
378 <tt>constructor</tt>, <tt>destructor</tt>, <tt>unused</tt>,
379 <tt>deprecated</tt>, <tt>warn_unused_result</tt>, <tt>weak</tt><br>
380
381 <b>Ignored:</b> <tt>noreturn</tt>, <tt>noinline</tt>,
382 <tt>always_inline</tt>, <tt>pure</tt>, <tt>const</tt>, <tt>nothrow</tt>,
383 <tt>malloc</tt>, <tt>no_instrument_function</tt>, <tt>cdecl</tt><br>
384
385 <b>Unsupported:</b> <tt>used</tt>, <tt>section</tt>, <tt>alias</tt>,
386 <tt>visibility</tt>, <tt>regparm</tt>, <tt>stdcall</tt>,
387 <tt>fastcall</tt>, all other target specific attributes</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000388
389 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Attributes.html#Variable%20Attributes">Variable Attributes</a>:
390 Specifying attributes of variables.<br>
391 <b>Supported:</b> <tt>cleanup</tt>, <tt>common</tt>, <tt>nocommon</tt>,
392 <tt>deprecated</tt>, <tt>transparent_union</tt>,
393 <tt>unused</tt>, <tt>weak</tt><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000394
Chris Lattner79c3fe12003-10-02 04:57:28 +0000395 <b>Unsupported:</b> <tt>aligned</tt>, <tt>mode</tt>, <tt>packed</tt>,
396 <tt>section</tt>, <tt>shared</tt>, <tt>tls_model</tt>,
397 <tt>vector_size</tt>, <tt>dllimport</tt>,
Misha Brukman500bc302003-11-22 00:38:41 +0000398 <tt>dllexport</tt>, all target specific attributes.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000399
400 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Type-Attributes.html#Type%20Attributes">Type Attributes</a>: Specifying attributes of types.
401 <b>Supported:</b> <tt>transparent_union</tt>, <tt>unused</tt>,
402 <tt>deprecated</tt>, <tt>may_alias</tt>
Misha Brukman500bc302003-11-22 00:38:41 +0000403
404 <b>Unsupported:</b> <tt>aligned</tt>, <tt>packed</tt>,
405 all target specific attributes.</li>
406
Chris Lattner79c3fe12003-10-02 04:57:28 +0000407 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html#Other%20Builtins">Other Builtins</a>:
408 Other built-in functions.<br>
409 We support all builtins which have a C language equivalent (e.g.,
410 <tt>__builtin_cos</tt>), <tt>__builtin_alloca</tt>,
411 <tt>__builtin_types_compatible_p</tt>, <tt>__builtin_choose_expr</tt>,
Misha Brukman500bc302003-11-22 00:38:41 +0000412 <tt>__builtin_constant_p</tt>, and <tt>__builtin_expect</tt> (ignored).</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000413
Misha Brukman500bc302003-11-22 00:38:41 +0000414 </ol>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000415
Misha Brukman500bc302003-11-22 00:38:41 +0000416 <p>The following extensions <b>are</b> known to be supported:</p>
417
Chris Lattner79c3fe12003-10-02 04:57:28 +0000418 <ol>
Misha Brukman500bc302003-11-22 00:38:41 +0000419 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html#Statement%20Exprs">Statement Exprs</a>: Putting statements and declarations inside expressions.</li>
420 <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>
421 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Lvalues.html#Lvalues">Lvalues</a>: Using <code>?:</code>, "<code>,</code>" and casts in lvalues.</li>
422 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Conditionals.html#Conditionals">Conditionals</a>: Omitting the middle operand of a <code>?:</code> expression.</li>
423 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Long-Long.html#Long%20Long">Long Long</a>: Double-word integers.</li>
424 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Complex.html#Complex">Complex</a>: Data types for complex numbers.</li>
425 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Hex-Floats.html#Hex%20Floats">Hex Floats</a>:Hexadecimal floating-point constants.</li>
426 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html#Zero%20Length">Zero Length</a>: Zero-length arrays.</li>
427 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Empty-Structures.html#Empty%20Structures">Empty Structures</a>: Structures with no members.</li>
428 <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>
429 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Escaped-Newlines.html#Escaped%20Newlines">Escaped Newlines</a>: Slightly looser rules for escaped newlines.</li>
430 <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>
431 <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>
432 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Initializers.html#Initializers">Initializers</a>: Non-constant initializers.</li>
433 <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>
434 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Designated-Inits.html#Designated%20Inits">Designated Inits</a>: Labeling elements of initializers.</li>
435 <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>
436 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Case-Ranges.html#Case%20Ranges">Case Ranges</a>: `case 1 ... 9' and such.</li>
437 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Mixed-Declarations.html#Mixed%20Declarations">Mixed Declarations</a>: Mixing declarations and code.</li>
438 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Function-Prototypes.html#Function%20Prototypes">Function Prototypes</a>: Prototype declarations and old-style definitions.</li>
439 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/C---Comments.html#C++%20Comments">C++ Comments</a>: C++ comments are recognized.</li>
440 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Dollar-Signs.html#Dollar%20Signs">Dollar Signs</a>: Dollar sign is allowed in identifiers.</li>
441 <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>
442 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Alignment.html#Alignment">Alignment</a>: Inquiring about the alignment of a type or variable.</li>
443 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Inline.html#Inline">Inline</a>: Defining inline functions (as fast as macros).</li>
444 <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>
445 <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>
446 <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>
447 <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>
448 <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 +0000449 </ol></li>
450
451</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000452
Misha Brukman500bc302003-11-22 00:38:41 +0000453<p>If you run into GCC extensions which have not been included in any of these
454lists, please let us know (also including whether or not they work).</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000455
Misha Brukman500bc302003-11-22 00:38:41 +0000456</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000457
Misha Brukman500bc302003-11-22 00:38:41 +0000458<!-- ======================================================================= -->
459<div class="doc_subsection">
460 <a name="c++-fe">Known problems with the C++ front-end</a>
461</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000462
Misha Brukman500bc302003-11-22 00:38:41 +0000463<div class="doc_text">
464
465<p>For this release, the C++ front-end is considered to be fully functional but
466of <b>beta</b> quality. It has been tested and works for a number of simple
467programs that collectively exercise most of the language. Nevertheless, it has
468not been in use as long as the C front-end. Please report any bugs or
469problems.</p>
470
471</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000472
473<!-- _______________________________________________________________________ -->
Misha Brukman500bc302003-11-22 00:38:41 +0000474<div class="doc_subsubsection">
475 Bugs
476</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000477
Misha Brukman500bc302003-11-22 00:38:41 +0000478<div class="doc_text">
Chris Lattner79c3fe12003-10-02 04:57:28 +0000479
Misha Brukman500bc302003-11-22 00:38:41 +0000480<ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000481<li>The C++ front-end inherits all problems afflicting the <a href="#c-fe">C
Misha Brukman500bc302003-11-22 00:38:41 +0000482 front-end</a></li>
483</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000484
Misha Brukman500bc302003-11-22 00:38:41 +0000485</div>
486
487<!-- _______________________________________________________________________ -->
488<div class="doc_subsubsection">
489 Notes
490</div>
491
492<div class="doc_text">
493
494<ul>
Chris Lattnere01fcfb2003-10-27 18:30:37 +0000495
Chris Lattner79c3fe12003-10-02 04:57:28 +0000496<li>The C++ front-end is based on a pre-release of the GCC 3.4 C++ parser. This
497parser is significantly more standards compliant (and picky) than prior GCC
498versions. For more information, see the C++ section of the <a
499href="http://gcc.gnu.org/gcc-3.4/changes.html">GCC 3.4 release notes</a>.<p>
500
501<li>Destructors for local objects are not always run when a <tt>longjmp</tt> is
Chris Lattner19092612003-10-02 16:38:05 +0000502 performed. In particular, destructors for objects in the <tt>longjmp</tt>ing
Chris Lattner79c3fe12003-10-02 04:57:28 +0000503 function and in the <tt>setjmp</tt> receiver function may not be run.
504 Objects in intervening stack frames will be destroyed however (which is
Misha Brukman500bc302003-11-22 00:38:41 +0000505 better than most compilers).</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000506
Chris Lattner19092612003-10-02 16:38:05 +0000507<li>The LLVM C++ front-end follows the <a
508 href="http://www.codesourcery.com/cxx-abi">Itanium C++ ABI</a>.
509 This document, which is not Itanium specific, specifies a standard for name
510 mangling, class layout, v-table layout, RTTI formats, and other C++
511 representation issues. Because we use this API, code generated by the LLVM
512 compilers should be binary compatible with machine code generated by other
513 Itanium ABI C++ compilers (such as G++, the Intel and HP compilers, etc).
514 <i>However</i>, the exception handling mechanism used by LLVM is very
515 different from the model used in the Itanium ABI, so <b>exceptions will not
Misha Brukman500bc302003-11-22 00:38:41 +0000516 interact correctly</b>. </li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000517
Misha Brukman500bc302003-11-22 00:38:41 +0000518</ul>
Chris Lattnerfcc54b32003-10-07 22:14:37 +0000519
Misha Brukman500bc302003-11-22 00:38:41 +0000520</div>
521
522<!-- ======================================================================= -->
523<div class="doc_subsection">
524 <a name="x86-be">Known problems with the X86 back-end</a>
525</div>
526
527<div class="doc_text">
528
529<ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000530
Chris Lattnerfcc54b32003-10-07 22:14:37 +0000531<li>The X86 code generator <a
Chris Lattner0d4379a2003-10-08 06:01:38 +0000532href="http://llvm.cs.uiuc.edu/PR16">does not currently
Chris Lattnerfcc54b32003-10-07 22:14:37 +0000533support the <tt>unwind</tt> instruction</a>, so code that throws a C++ exception
Misha Brukman500bc302003-11-22 00:38:41 +0000534or calls the C <tt>longjmp</tt> function will abort.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000535
Misha Brukman500bc302003-11-22 00:38:41 +0000536</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000537
Misha Brukman500bc302003-11-22 00:38:41 +0000538</div>
539
540<!-- ======================================================================= -->
541<div class="doc_subsection">
542 <a name="sparc-be">Known problems with the Sparc back-end</a>
543</div>
544
545<div class="doc_text">
546
547<ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000548
Chris Lattnerfcc54b32003-10-07 22:14:37 +0000549<li>The Sparc code generator <a
Chris Lattner0d4379a2003-10-08 06:01:38 +0000550href="http://llvm.cs.uiuc.edu/PR15">does not currently
Chris Lattnerfcc54b32003-10-07 22:14:37 +0000551support the <tt>unwind</tt> instruction</a>, so code that throws a C++ exception
Misha Brukman500bc302003-11-22 00:38:41 +0000552or calls the C <tt>longjmp</tt> function will abort.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000553
Misha Brukman500bc302003-11-22 00:38:41 +0000554</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000555
Misha Brukman500bc302003-11-22 00:38:41 +0000556</div>
557
558<!-- ======================================================================= -->
559<div class="doc_subsection">
560 <a name="c-be">Known problems with the C back-end</a>
561</div>
562
563<div class="doc_text">
564
565<ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000566
567<li>The C back-end produces code that violates the ANSI C Type-Based Alias
568Analysis rules. As such, special options may be necessary to compile the code
569(for example, GCC requires the <tt>-fno-strict-aliasing</tt> option). This
Misha Brukman500bc302003-11-22 00:38:41 +0000570problem probably cannot be fixed.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000571
Chris Lattnere84843b2003-10-20 19:05:03 +0000572<li><a href="http://llvm.cs.uiuc.edu/PR33">Initializers for global variables</a>
Misha Brukman500bc302003-11-22 00:38:41 +0000573cannot include special floating point numbers like Not-A-Number or
574Infinity.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000575
Chris Lattner2855ecd2003-11-04 20:06:53 +0000576<li><a href="http://llvm.cs.uiuc.edu/PR56">Zero arg vararg functions are not
Chris Lattner2af46052003-10-24 04:03:19 +0000577supported</a>. This should not affect LLVM produced by the C or C++
Misha Brukman500bc302003-11-22 00:38:41 +0000578frontends.</li>
Chris Lattner2af46052003-10-24 04:03:19 +0000579
Chris Lattner2855ecd2003-11-04 20:06:53 +0000580<li>The code produces by the C back-end has only been tested with the Sun CC,
581GCC, and Intel compilers. It is possible that it will have to be adjusted to
Misha Brukman500bc302003-11-22 00:38:41 +0000582support other C compilers.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000583
Misha Brukman500bc302003-11-22 00:38:41 +0000584</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000585
Misha Brukman500bc302003-11-22 00:38:41 +0000586</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000587
588<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000589<div class="doc_section">
590 <a name="additionalinfo">Additional Information</a>
591</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000592<!-- *********************************************************************** -->
593
Misha Brukman500bc302003-11-22 00:38:41 +0000594<div class="doc_text">
595
596<p>A wide variety of additional information is available on the LLVM web page,
Chris Lattner79c3fe12003-10-02 04:57:28 +0000597including mailing lists publications describing algorithms and components
598implemented in LLVM. The web page also contains versions of the API
599documentation which is up-to-date with the CVS version of the source code. You
600can access versions of these documents specific to this release by going into
Misha Brukman500bc302003-11-22 00:38:41 +0000601the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p>
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