Gitiles
Code Review Sign In
gerrit-public.fairphone.software / toolchain / llvm-project / 982d57da39dfde695a9f2578f27f80230a817f1a / . / llvm / docs / ReleaseNotes.html
blob: 2622a496ab2838ff3aad5a608e5ab91a1fee12b3 [file] [log] [blame]
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]1<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
2 "http://www.w3.org/TR/html4/strict.dtd">
3<html>
4<head>
Reid Spencere4190fa2004-11-18 18:38:58 +0000[diff] [blame]5 <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]6 <link rel="stylesheet" href="llvm.css" type="text/css">
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]7 <title>LLVM 2.1 Release Notes</title>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]8</head>
9<body>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]10
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]11<div class="doc_title">LLVM 2.1 Release Notes</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]12
13<ol>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]14 <li><a href="#intro">Introduction</a></li>
15 <li><a href="#whatsnew">What's New?</a></li>
Chris Lattner77a51732004-04-30 22:17:12 +0000[diff] [blame]16 <li><a href="GettingStarted.html">Installation Instructions</a></li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]17 <li><a href="#portability">Portability and Supported Platforms</a></li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]18 <li><a href="#knownproblems">Known Problems</a>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]19 <li><a href="#additionalinfo">Additional Information</a></li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]20</ol>
21
Chris Lattner020e1fc2004-05-23 21:07:27 +0000[diff] [blame]22<div class="doc_author">
Chris Lattnera69595e2005-10-29 07:07:09 +0000[diff] [blame]23 <p>Written by the <a href="http://llvm.org">LLVM Team</a><p>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]24</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]25
26<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]27<div class="doc_section">
28 <a name="intro">Introduction</a>
29</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]30<!-- *********************************************************************** -->
31
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]32<div class="doc_text">
33
34<p>This document contains the release notes for the LLVM compiler
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]35infrastructure, release 2.1. Here we describe the status of LLVM, including
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]36major improvements from the previous release and any known problems. All LLVM
Chris Lattner98a33492007-05-09 04:58:11 +0000[diff] [blame]37releases may be downloaded from the <a href="http://llvm.org/releases/">LLVM
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]38releases web site</a>.</p>
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]39
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]40<p>For more information about LLVM, including information about the latest
Chris Lattnera69595e2005-10-29 07:07:09 +0000[diff] [blame]41release, please check out the <a href="http://llvm.org/">main LLVM
Chris Lattnere7525b52003-10-07 21:38:31 +0000[diff] [blame]42web site</a>. If you have questions or comments, the <a
43href="http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVM developer's mailing
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]44list</a> is a good place to send them.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]45
Reid Spencerc7f87f22007-07-09 08:04:31 +0000[diff] [blame]46<p>Note that if you are reading this file from a Subversion checkout or the
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]47main LLVM web page, this document applies to the <i>next</i> release, not the
48current one. To see the release notes for a specific releases, please see the
49<a href="http://llvm.org/releases/">releases page</a>.</p>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]50
51</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]52
53<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]54<div class="doc_section">
55 <a name="whatsnew">What's New?</a>
56</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]57<!-- *********************************************************************** -->
58
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]59<div class="doc_text">
60
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]61<p>This is the twelfth public release of the LLVM Compiler Infrastructure.
62It includes many features and refinements from LLVM 2.0.</p>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]63
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]64</div>
65
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]66<!--=========================================================================-->
Chris Lattner406bddf2005-05-15 05:44:51 +0000[diff] [blame]67<div class="doc_subsection">
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]68<a name="frontends">New Frontends</a>
Chris Lattner9f871732006-04-18 06:18:36 +0000[diff] [blame]69</div>
70
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]71<div class="doc_text">
Chris Lattner727c3742007-05-18 06:33:02 +0000[diff] [blame]72
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]73<p>LLVM 2.1 brings two new beta C front-ends. First, Duncan, Anton and Devang
Devang Pateld331c852007-09-21 18:02:24 +0000[diff] [blame]74has started syncing up llvm-gcc with GCC 4.2, yielding "llvm-gcc 4.2" (creative,
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]75huh?). llvm-gcc 4.2 has the promise to bring much better FORTRAN and Ada
76support to LLVM as well as features like atomic builtins, OpenMP, and many other
77things. Check it out!</p>
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]78
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]79<p>Second, LLVM now includes its own native C and Objective-C front-end (C++ is
80in progress, but is not very far along) code named "<a
81href="http://clang.llvm.org/">clang</a>". This front-end has a number of great
82features, primarily aimed at source-level analysis and speeding up compile-time.
83At this point though, the LLVM Code Generator component is still very early in
84development, so it's mostly useful for people looking to build source-level
85analysis tools or source-to-source translators.</p>
Chris Lattner727c3742007-05-18 06:33:02 +0000[diff] [blame]86
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]87</div>
88
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]89<!--=========================================================================-->
90<div class="doc_subsection">
91<a name="optimizer">Optimizer Improvements</a>
92</div>
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]93
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]94<div class="doc_text">
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]95
96<p>Some of the most noticable improvements this release have been in the
97optimizer, speeding it up and making it more aggressive</p>
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]98
99<ul>
Tanya Lattner6ee68ca2007-05-16 23:25:46 +0000[diff] [blame]100
Owen Anderson5d913aa2007-09-25 02:10:58 +0000[diff] [blame]101<li>Owen Anderson wrote the new MemoryDependenceAnalysis pass, which provides
102 a lazy, caching layer on top of alias analysis. He then used it to rewrite
103 DeadStoreElimination which resulted in significantly better compile time in
104 common cases, </li>
105<li>Owen implemented the new GVN pass, which is also based on
106 MemoryDependenceAnalysis. This pass replaces GCSE/LoadVN in the standard
107 set of passes, providing more aggressive optimization at a some-what
108 improved compile-time cost.</li>
109<li>Owen implemented GVN-PRE, a partial redundancy elimination algorithm that
110 shares some details with the new GVN pass. It is still in need of compile
111 time tuning, and is not turned on by default.</li>
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]112<li>Devang merged ETForest and DomTree into a single easier to use data
113structure.</li>
114<li>Nick Lewycky improved loop trip count analysis to handle many more common
115cases.</li>
Tanya Lattner6ee68ca2007-05-16 23:25:46 +0000[diff] [blame]116
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]117</ul>
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]118
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]119</div>
120
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]121<!--=========================================================================-->
122<div class="doc_subsection">
123<a name="codegen">Code Generator Improvements</a>
124</div>
125
126<div class="doc_text">
127
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]128<ul>
129
130<li>Dale finished up the Tail Merging optimization in the code generator,
131enabling it by default. This produces smaller code that is also faster in some
132cases.</li>
133
134<li>Dan Gohman changed the way we represent vectors before legalization,
135significantly simplifying the SelectionDAG representation for these and making
136the code generator faster for vector code.</li>
137
Chris Lattner1af762f2007-09-21 17:43:52 +0000[diff] [blame]138<li>Evan remat rewrite (coalesced intervals + folding of remat'd loads) and
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]139live intervals improvements.</li>
140
141<li>Dan Gohman contributed support for better alignment and volatility handling
142in the code generator, and significantly enhanced alignment analysis for SSE
143load/store instructions.</li>
144
145<li>Christopher Lamb virtual register sub-register support, better truncates and
146extends on X86.</li>
147
148<li>Duraid Madina contributed a new "bigblock" register allocator, and Roman
149Levenstein contributed several big improvements. BigBlock is optimized for code
150that uses very large basic blocks. It is slightly slower than the "local"
151allocator, but produces much better code.</li>
152
Chris Lattner1af762f2007-09-21 17:43:52 +0000[diff] [blame]153<li>David Greene refactored the register allocator to split coalescing out from
154allocation, making coalescers pluggable.</li>
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]155
156</ul>
157
158</div>
159
160
161<!--=========================================================================-->
162<div class="doc_subsection">
163<a name="targetspecific">Target Specific Improvements</a>
164</div>
Chris Lattner727c3742007-05-18 06:33:02 +0000[diff] [blame]165
Chris Lattner89e761c2006-04-18 06:32:08 +0000[diff] [blame]166<div class="doc_text">
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]167<p>New features include:
168</p>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]169
170<ul>
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]171<li>Bruno Cardoso Lopes contributed initial MIPS support.</li>
172<li>Bill Wendling added SSSE3 support.</li>
173<li>New Target independent if converter, ARM uses it so far</li>
174<li>Nicholas Geoffray contributed improved linux/ppc ABI and JIT support.</li>
175<li>Dale Johannesen rewrote handling of 32-bit float values in the X86 backend
176when using the floating point stack, fixing several nasty bugs.</li>
177<li>Dan contributed rematerialization support for the X86 backend.</li>
178</ul>
179
180</div>
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]181
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]182
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]183<!--=========================================================================-->
184<div class="doc_subsection">
185<a name="llvmgccimprovements">llvm-gcc Improvements</a>
186</div>
Tanya Lattner6ee68ca2007-05-16 23:25:46 +0000[diff] [blame]187
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]188<div class="doc_text">
189<p>New features include:
190</p>
Tanya Lattner6ee68ca2007-05-16 23:25:46 +0000[diff] [blame]191
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]192<ul>
193<li>Duncan and Anton exception handling in llvm-gcc 4.0/4.2</li>
Tanya Lattner6ee68ca2007-05-16 23:25:46 +0000[diff] [blame]194
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]195<li>Devang and Duncan: Bitfields, pragma pack</li>
Chris Lattner727c3742007-05-18 06:33:02 +0000[diff] [blame]196
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]197<li>Tanya implemented support for __attribute__((noinline)) in llvm-gcc, and
198added support for generic variable annotations which are propagated into the
199LLVM IR, e.g. "<tt>int X __attribute__((annotate("myproperty")));</tt>".</li>
200
201<li>Sheng Zhou and Christopher Lamb implemented alias analysis support for
202'restrict' arguments to functions.</li>
203
204<li>Duncan contributed support for trampolines (pointers to nested functions),
205currently only supported on x86 target.</li>
Tanya Lattner6ee68ca2007-05-16 23:25:46 +0000[diff] [blame]206
Devang Pateld331c852007-09-21 18:02:24 +0000[diff] [blame]207<li> Lauro Ramos Venancio contributed support to encode alignment info in
208load and store instructions.</li>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]209</ul>
210
Chris Lattner89e761c2006-04-18 06:32:08 +0000[diff] [blame]211</div>
212
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]213
214<!--=========================================================================-->
215<div class="doc_subsection">
216<a name="coreimprovements">LLVM Core Improvements</a>
217</div>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]218
Chris Lattner0b7fd712006-04-19 04:02:47 +0000[diff] [blame]219<div class="doc_text">
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]220<p>New features include:
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]221</p>
222
223<ul>
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]224<li>Neil Booth APFloat, foundation for long double support that will be wrapped
225up in 2.2. Dale contributed most of long double support, will be enabled in
2262.2.</li>
Tanya Lattner6ee68ca2007-05-16 23:25:46 +0000[diff] [blame]227
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]228<li>LLVM now provides an LLVMBuilder class which makes it significantly easier
229to create LLVM IR instructions.</li>
Tanya Lattner6ee68ca2007-05-16 23:25:46 +0000[diff] [blame]230
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]231<li>Reid contributed support for intrinsics that take arbitrary integer typed
232arguments, Dan Gohman and Chandler extended it to support FP and vectors.</li>
Chris Lattner8ce1ba42007-05-17 21:41:31 +0000[diff] [blame]233</ul>
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]234
Chris Lattner8ce1ba42007-05-17 21:41:31 +0000[diff] [blame]235</div>
Chris Lattner72a269f2006-03-03 00:34:26 +0000[diff] [blame]236
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]237<!--=========================================================================-->
238<div class="doc_subsection">
239<a name="otherimprovements">Other Improvements</a>
240</div>
241
242<div class="doc_text">
243<p>New features include:
244</p>
245
246<ul>
247<li>BrainF frontend by Sterling Stein.</li>
248
249<li>David Green contributed a new --enable-expensive-checks configure option
250which enables STL checking, and fixed several bugs exposed by it.</li>
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]251</ul>
252
253</div>
Chris Lattner72a269f2006-03-03 00:34:26 +0000[diff] [blame]254
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]255<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]256<div class="doc_section">
257 <a name="portability">Portability and Supported Platforms</a>
258</div>
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]259<!-- *********************************************************************** -->
260
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]261<div class="doc_text">
262
John Criswell64307722004-12-08 20:35:47 +0000[diff] [blame]263<p>LLVM is known to work on the following platforms:</p>
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]264
265<ul>
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]266<li>Intel and AMD machines running Red Hat Linux, Fedora Core and FreeBSD
Reid Spencer9803b402005-05-17 02:47:27 +0000[diff] [blame]267 (and probably other unix-like systems).</li>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]268<li>PowerPC and X86-based Mac OS X systems, running 10.2 and above in 32-bit and
269 64-bit modes.</li>
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]270<li>Intel and AMD machines running on Win32 using MinGW libraries (native)</li>
271<li>Intel and AMD machines running on Win32 with the Cygwin libraries (limited
272 support is available for native builds with Visual C++).</li>
273<li>Sun UltraSPARC workstations running Solaris 8.</li>
John Criswelld5234922005-05-13 20:28:15 +0000[diff] [blame]274<li>Alpha-based machines running Debian GNU/Linux.</li>
275<li>Itanium-based machines running Linux and HP-UX.</li>
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]276</ul>
277
Brian Gaekee3e557e2004-05-09 05:28:35 +0000[diff] [blame]278<p>The core LLVM infrastructure uses
279<a href="http://www.gnu.org/software/autoconf/">GNU autoconf</a> to adapt itself
280to the machine and operating system on which it is built. However, minor
281porting may be required to get LLVM to work on new platforms. We welcome your
282portability patches and reports of successful builds or error messages.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]283
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]284</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]285
286<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]287<div class="doc_section">
288 <a name="knownproblems">Known Problems</a>
289</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]290<!-- *********************************************************************** -->
291
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]292<div class="doc_text">
293
294<p>This section contains all known problems with the LLVM system, listed by
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]295component. As new problems are discovered, they will be added to these
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]296sections. If you run into a problem, please check the <a
Chris Lattnera69595e2005-10-29 07:07:09 +0000[diff] [blame]297href="http://llvm.org/bugs/">LLVM bug database</a> and submit a bug if
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]298there isn't already one.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]299
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]300</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]301
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]302<!-- ======================================================================= -->
303<div class="doc_subsection">
304 <a name="experimental">Experimental features included with this release</a>
305</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]306
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]307<div class="doc_text">
308
Misha Brukmanfa50a222004-05-12 21:46:05 +0000[diff] [blame]309<p>The following components of this LLVM release are either untested, known to
310be broken or unreliable, or are in early development. These components should
311not be relied on, and bugs should not be filed against them, but they may be
312useful to some people. In particular, if you would like to work on one of these
Chris Lattner05a225b2006-08-09 04:08:52 +0000[diff] [blame]313components, please contact us on the <a href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVMdev list</a>.</p>
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]314
315<ul>
Bill Wendling982d57d2007-09-25 20:45:10 +0000[diff] [blame^]316<li>The <tt>-cee</tt> pass is known to be buggy, and may be removed in a
Chris Lattner9f871732006-04-18 06:18:36 +0000[diff] [blame]317 future release.</li>
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]318<li>C++ EH support is disabled for this release.</li>
319<li>The MSIL backend is experimental.</li>
Chris Lattnera38fe5f2006-02-05 06:39:36 +0000[diff] [blame]320<li>The IA64 code generator is experimental.</li>
Chris Lattnera69595e2005-10-29 07:07:09 +0000[diff] [blame]321<li>The Alpha JIT is experimental.</li>
Chris Lattner9f871732006-04-18 06:18:36 +0000[diff] [blame]322<li>"<tt>-filetype=asm</tt>" (the default) is the only supported value for the
323 <tt>-filetype</tt> llc option.</li>
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]324</ul>
325
326</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]327
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]328<!-- ======================================================================= -->
329<div class="doc_subsection">
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]330 <a name="x86-be">Known problems with the X86 back-end</a>
John Criswell3bdbd302005-11-08 21:11:33 +0000[diff] [blame]331</div>
332
333<div class="doc_text">
334
335<ul>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]336<li>The X86 backend does not yet support <a href="http://llvm.org/PR879">inline
Chris Lattner98a33492007-05-09 04:58:11 +0000[diff] [blame]337 assembly that uses the X86 floating point stack</a>.</li>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]338</ul>
339
340</div>
341
342<!-- ======================================================================= -->
343<div class="doc_subsection">
344 <a name="ppc-be">Known problems with the PowerPC back-end</a>
345</div>
346
347<div class="doc_text">
348
349<ul>
350<li><a href="http://llvm.org/PR642">PowerPC backend does not correctly
351implement ordered FP comparisons</a>.</li>
Nicolas Geoffray77d99502007-05-15 09:21:28 +0000[diff] [blame]352<li>The Linux PPC32/ABI support needs testing for the interpreter and static
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]353compilation, and lacks support for debug information.</li>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]354</ul>
355
356</div>
357
358<!-- ======================================================================= -->
359<div class="doc_subsection">
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]360 <a name="arm-be">Known problems with the ARM back-end</a>
361</div>
362
363<div class="doc_text">
364
365<ul>
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]366<li>Thumb mode works only on ARMv6 or higher processors. On sub-ARMv6
367processors, thumb program can crash or produces wrong
368results (<a href="http://llvm.org/PR1388">PR1388</a>).</li>
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]369<li>Compilation for ARM Linux OABI (old ABI) is supported, but not fully tested.
370</li>
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]371<li>There is a bug in QEMU-ARM (<= 0.9.0) which causes it to incorrectly execute
372programs compiled with LLVM. Please use more recent versions of QEMU.</li>
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]373</ul>
374
375</div>
376
377<!-- ======================================================================= -->
378<div class="doc_subsection">
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]379 <a name="sparc-be">Known problems with the SPARC back-end</a>
380</div>
381
382<div class="doc_text">
383
384<ul>
385<li>The SPARC backend only supports the 32-bit SPARC ABI (-m32), it does not
386 support the 64-bit SPARC ABI (-m64).</li>
387</ul>
388
389</div>
390
391<!-- ======================================================================= -->
392<div class="doc_subsection">
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]393 <a name="alpha-be">Known problems with the Alpha back-end</a>
394</div>
395
396<div class="doc_text">
397
398<ul>
399
400<li>On 21164s, some rare FP arithmetic sequences which may trap do not have the
401appropriate nops inserted to ensure restartability.</li>
402
John Criswell3bdbd302005-11-08 21:11:33 +0000[diff] [blame]403</ul>
404</div>
405
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]406<!-- ======================================================================= -->
407<div class="doc_subsection">
408 <a name="ia64-be">Known problems with the IA64 back-end</a>
409</div>
410
411<div class="doc_text">
412
413<ul>
414
415<li>C++ programs are likely to fail on IA64, as calls to <tt>setjmp</tt> are
416made where the argument is not 16-byte aligned, as required on IA64. (Strictly
417speaking this is not a bug in the IA64 back-end; it will also be encountered
418when building C++ programs using the C back-end.)</li>
419
420<li>The C++ front-end does not use <a href="http://llvm.org/PR406">IA64
421ABI compliant layout of v-tables</a>. In particular, it just stores function
422pointers instead of function descriptors in the vtable. This bug prevents
423mixing C++ code compiled with LLVM with C++ objects compiled by other C++
424compilers.</li>
425
426<li>There are a few ABI violations which will lead to problems when mixing LLVM
427output with code built with other compilers, particularly for floating-point
428programs.</li>
429
430<li>Defining vararg functions is not supported (but calling them is ok).</li>
431
Chris Lattner98a33492007-05-09 04:58:11 +0000[diff] [blame]432<li>The Itanium backend has bitrotted somewhat.</li>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]433</ul>
434
435</div>
436
437<!-- ======================================================================= -->
438<div class="doc_subsection">
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]439 <a name="c-be">Known problems with the C back-end</a>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]440</div>
441
442<div class="doc_text">
443
444<ul>
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]445<li><a href="http://llvm.org/PR802">The C backend does not support inline
446 assembly code</a>.</li>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]447</ul>
448
449</div>
John Criswell3bdbd302005-11-08 21:11:33 +0000[diff] [blame]450
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]451
452<!-- ======================================================================= -->
453<div class="doc_subsection">
454 <a name="c-fe">Known problems with the C front-end</a>
455</div>
Chris Lattner178f3db2003-10-02 05:07:23 +0000[diff] [blame]456
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]457<!-- _______________________________________________________________________ -->
Chris Lattner5a8a7282003-12-14 05:03:43 +0000[diff] [blame]458<div class="doc_subsubsection">Bugs</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]459
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]460<div class="doc_text">
Chris Lattner72a269f2006-03-03 00:34:26 +0000[diff] [blame]461
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]462<p>llvm-gcc4 does not currently support <a href="http://llvm.org/PR869">Link-Time
463Optimization</a> on most platforms "out-of-the-box". Please inquire on the
464llvmdev mailing list if you are interested.</p>
Chris Lattner44124232006-08-08 17:27:28 +0000[diff] [blame]465
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]466</div>
467
468<!-- _______________________________________________________________________ -->
469<div class="doc_subsubsection">
470 Notes
471</div>
472
473<div class="doc_text">
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]474<ul>
475
Chris Lattner2f131fe2007-05-17 22:02:24 +0000[diff] [blame]476<li><p>"long double" is silently transformed by the front-end into "double". There
477is no support for floating point data types of any size other than 32 and 64
478bits.</p></li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]479
Chris Lattner2f131fe2007-05-17 22:02:24 +0000[diff] [blame]480<li><p>llvm-gcc does <b>not</b> support <tt>__builtin_apply</tt> yet.
481 See <a href="http://gcc.gnu.org/onlinedocs/gcc/Constructing-Calls.html#Constructing%20Calls">Constructing Calls</a>: Dispatching a call to another function.</p>
482</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]483
Duncan Sandsea7a3262007-05-18 09:04:20 +0000[diff] [blame]484<li><p>llvm-gcc <b>partially</b> supports these GCC extensions:</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]485 <ol>
Chris Lattner2f131fe2007-05-17 22:02:24 +0000[diff] [blame]486 <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.<br>
487 Nested functions are supported, but llvm-gcc does not support non-local
488 gotos or taking the address of a nested function.</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]489
490 <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]491
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]492 Declaring that functions have no side effects or that they can never
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]493 return.<br>
494
Chris Lattner2f131fe2007-05-17 22:02:24 +0000[diff] [blame]495 <b>Supported:</b> <tt>alias</tt>, <tt>always_inline</tt>, <tt>cdecl</tt>,
496 <tt>constructor</tt>, <tt>destructor</tt>,
Anton Korobeynikove7cbbfc2006-11-18 08:04:48 +0000[diff] [blame]497 <tt>deprecated</tt>, <tt>fastcall</tt>, <tt>format</tt>,
Anton Korobeynikovc52614b2007-05-10 08:26:24 +0000[diff] [blame]498 <tt>format_arg</tt>, <tt>non_null</tt>, <tt>noreturn</tt>, <tt>regparm</tt>
Anton Korobeynikovc7f9f3d2007-01-23 12:35:46 +0000[diff] [blame]499 <tt>section</tt>, <tt>stdcall</tt>, <tt>unused</tt>, <tt>used</tt>,
500 <tt>visibility</tt>, <tt>warn_unused_result</tt>, <tt>weak</tt><br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]501
Chris Lattner2f131fe2007-05-17 22:02:24 +0000[diff] [blame]502 <b>Ignored:</b> <tt>noinline</tt>, <tt>pure</tt>, <tt>const</tt>, <tt>nothrow</tt>,
503 <tt>malloc</tt>, <tt>no_instrument_function</tt></li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]504 </ol>
Chris Lattner2f131fe2007-05-17 22:02:24 +0000[diff] [blame]505</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]506
Chris Lattner2f131fe2007-05-17 22:02:24 +0000[diff] [blame]507<li><p>llvm-gcc supports the vast majority of GCC extensions, including:</p>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]508
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]509 <ol>
Chris Lattner2f131fe2007-05-17 22:02:24 +0000[diff] [blame]510 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Pragmas.html#Pragmas">Pragmas</a>: Pragmas accepted by GCC.</li>
511 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Local-Labels.html#Local%20Labels">Local Labels</a>: Labels local to a block.</li>
512 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html#Other%20Builtins">Other Builtins</a>:
513 Other built-in functions.</li>
514 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Attributes.html#Variable%20Attributes">Variable Attributes</a>:
515 Specifying attributes of variables.</li>
516 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Type-Attributes.html#Type%20Attributes">Type Attributes</a>: Specifying attributes of types.</li>
517 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Thread_002dLocal.html">Thread-Local</a>: Per-thread variables.</li>
518 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Length.html#Variable%20Length">Variable Length</a>:
519 Arrays whose length is computed at run time.</li>
Chris Lattnerd3dc8502004-03-16 08:54:07 +0000[diff] [blame]520 <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]521 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html#Statement%20Exprs">Statement Exprs</a>: Putting statements and declarations inside expressions.</li>
522 <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]523 <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]524 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Conditionals.html#Conditionals">Conditionals</a>: Omitting the middle operand of a <code>?:</code> expression.</li>
525 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Long-Long.html#Long%20Long">Long Long</a>: Double-word integers.</li>
526 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Complex.html#Complex">Complex</a>: Data types for complex numbers.</li>
527 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Hex-Floats.html#Hex%20Floats">Hex Floats</a>:Hexadecimal floating-point constants.</li>
528 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html#Zero%20Length">Zero Length</a>: Zero-length arrays.</li>
529 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Empty-Structures.html#Empty%20Structures">Empty Structures</a>: Structures with no members.</li>
530 <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>
531 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Escaped-Newlines.html#Escaped%20Newlines">Escaped Newlines</a>: Slightly looser rules for escaped newlines.</li>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]532 <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>
533 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Constraints.html#Constraints">Constraints</a>: Constraints for asm operands.</li>
534 <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>
535 <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>
536 <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>
537 <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>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]538 <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]539 <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]540 <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]541 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Compound-Literals.html#Compound%20Literals">Compound Literals</a>: Compound literals give structures, unions,
542or arrays as values.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]543 <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]544 <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]545 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Case-Ranges.html#Case%20Ranges">Case Ranges</a>: `case 1 ... 9' and such.</li>
546 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Mixed-Declarations.html#Mixed%20Declarations">Mixed Declarations</a>: Mixing declarations and code.</li>
547 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Function-Prototypes.html#Function%20Prototypes">Function Prototypes</a>: Prototype declarations and old-style definitions.</li>
Tanya Lattner7591b822004-12-08 18:29:38 +0000[diff] [blame]548 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/C_002b_002b-Comments.html#C_002b_002b-Comments">C++ Comments</a>: C++ comments are recognized.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]549 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Dollar-Signs.html#Dollar%20Signs">Dollar Signs</a>: Dollar sign is allowed in identifiers.</li>
550 <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>
551 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Alignment.html#Alignment">Alignment</a>: Inquiring about the alignment of a type or variable.</li>
552 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Inline.html#Inline">Inline</a>: Defining inline functions (as fast as macros).</li>
553 <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>
554 <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>
555 <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]556 <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]557 <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>
558 <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]559 </ol></li>
560
561</ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]562
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]563<p>If you run into GCC extensions which have not been included in any of these
564lists, please let us know (also including whether or not they work).</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]565
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]566</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]567
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]568<!-- ======================================================================= -->
569<div class="doc_subsection">
570 <a name="c++-fe">Known problems with the C++ front-end</a>
571</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]572
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]573<div class="doc_text">
574
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]575<p>The C++ front-end is considered to be fully
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]576tested and works for a number of non-trivial programs, including LLVM
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]577itself, Qt, Mozilla, etc.</p>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]578
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]579<ul>
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]580<li>llvm-gcc4 only has partial support for <a href="http://llvm.org/PR870">C++
581Exception Handling</a>, and it is not enabled by default.</li>
582
583<!-- NO EH Support!
Chris Lattnerd2a74272003-10-27 18:30:37 +0000[diff] [blame]584
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]585<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]586 performed. In particular, destructors for objects in the <tt>longjmp</tt>ing
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]587 function and in the <tt>setjmp</tt> receiver function may not be run.
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]588 Objects in intervening stack frames will be destroyed, however (which is
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]589 better than most compilers).</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]590
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]591<li>The LLVM C++ front-end follows the <a
592 href="http://www.codesourcery.com/cxx-abi">Itanium C++ ABI</a>.
593 This document, which is not Itanium specific, specifies a standard for name
594 mangling, class layout, v-table layout, RTTI formats, and other C++
595 representation issues. Because we use this API, code generated by the LLVM
596 compilers should be binary compatible with machine code generated by other
597 Itanium ABI C++ compilers (such as G++, the Intel and HP compilers, etc).
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]598 <i>However</i>, the exception handling mechanism used by llvm-gcc3 is very
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]599 different from the model used in the Itanium ABI, so <b>exceptions will not
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]600 interact correctly</b>. </li>
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]601-->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]602</ul>
Chris Lattner46ecf612003-10-07 22:14:37 +0000[diff] [blame]603
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]604</div>
605
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]606
Chris Lattnerb62a5f02005-05-15 16:01:20 +0000[diff] [blame]607
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]608<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]609<div class="doc_section">
610 <a name="additionalinfo">Additional Information</a>
611</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]612<!-- *********************************************************************** -->
613
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]614<div class="doc_text">
615
Chris Lattnercb5596d2005-05-16 17:13:10 +0000[diff] [blame]616<p>A wide variety of additional information is available on the <a
Chris Lattnere0c1df42007-05-18 00:44:29 +0000[diff] [blame]617href="http://llvm.org">LLVM web page</a>, in particular in the <a
618href="http://llvm.org/docs/">documentation</a> section. The web page also
Reid Spencerc7f87f22007-07-09 08:04:31 +0000[diff] [blame]619contains versions of the API documentation which is up-to-date with the
620Subversion version of the source code.
Misha Brukman96158092005-03-30 19:14:24 +0000[diff] [blame]621You can access versions of these documents specific to this release by going
622into the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]623
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]624<p>If you have any questions or comments about LLVM, please feel free to contact
Chris Lattnera69595e2005-10-29 07:07:09 +0000[diff] [blame]625us via the <a href="http://llvm.org/docs/#maillist"> mailing
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]626lists</a>.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]627
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]628</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]629
630<!-- *********************************************************************** -->
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]631
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]632<hr>
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]633<address>
Misha Brukman8834af92003-12-21 22:53:21 +0000[diff] [blame]634 <a href="http://jigsaw.w3.org/css-validator/check/referer"><img
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]635 src="http://jigsaw.w3.org/css-validator/images/vcss" alt="Valid CSS!"></a>
636 <a href="http://validator.w3.org/check/referer"><img
637 src="http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01!" /></a>
638
Chris Lattnere0c1df42007-05-18 00:44:29 +0000[diff] [blame]639 <a href="http://llvm.org/">LLVM Compiler Infrastructure</a><br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]640 Last modified: $Date$
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]641</address>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]642
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]643</body>
644</html>