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gerrit-public.fairphone.software / fp2-dev / platform / external / llvm / b4c68cd62c67b7fdab192a0902c926f7c5054586 / . / docs / ReleaseNotes.html
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Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]1<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
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3<html>
4<head>
Reid Spencer6454ed32004-11-18 18:38:58 +0000[diff] [blame]5 <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]6 <link rel="stylesheet" href="llvm.css" type="text/css">
Chris Lattner000c73b2008-02-06 06:30:34 +0000[diff] [blame]7 <title>LLVM 2.2 Release Notes</title>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]8</head>
9<body>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]10
Chris Lattner000c73b2008-02-06 06:30:34 +0000[diff] [blame]11<div class="doc_title">LLVM 2.2 Release Notes</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]12
13<ol>
Misha Brukman500bc302003-11-22 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 Lattner4b538b92004-04-30 22:17:12 +0000[diff] [blame]16 <li><a href="GettingStarted.html">Installation Instructions</a></li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]17 <li><a href="#portability">Portability and Supported Platforms</a></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]18 <li><a href="#knownproblems">Known Problems</a>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]19 <li><a href="#additionalinfo">Additional Information</a></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]20</ol>
21
Chris Lattner7911ce22004-05-23 21:07:27 +0000[diff] [blame]22<div class="doc_author">
Chris Lattnerc463b272005-10-29 07:07:09 +0000[diff] [blame]23 <p>Written by the <a href="http://llvm.org">LLVM Team</a><p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]24</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]25
Chris Lattner052bae62008-02-06 18:00:48 +0000[diff] [blame]26<h1><font color="red">THIS IS A WORK IN PROGRESS FOR THE LLVM 2.2
27RELEASE</font</h1>
28
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]29<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]30<div class="doc_section">
31 <a name="intro">Introduction</a>
32</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]33<!-- *********************************************************************** -->
34
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]35<div class="doc_text">
36
37<p>This document contains the release notes for the LLVM compiler
Chris Lattner000c73b2008-02-06 06:30:34 +0000[diff] [blame]38infrastructure, release 2.2. Here we describe the status of LLVM, including
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]39major improvements from the previous release and any known problems. All LLVM
Chris Lattnercaf06342007-05-09 04:58:11 +0000[diff] [blame]40releases may be downloaded from the <a href="http://llvm.org/releases/">LLVM
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]41releases web site</a>.</p>
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]42
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame]43<p>For more information about LLVM, including information about the latest
Chris Lattnerc463b272005-10-29 07:07:09 +0000[diff] [blame]44release, please check out the <a href="http://llvm.org/">main LLVM
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]45web site</a>. If you have questions or comments, the <a
46href="http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVM developer's mailing
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]47list</a> is a good place to send them.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]48
Reid Spencer669ed452007-07-09 08:04:31 +0000[diff] [blame]49<p>Note that if you are reading this file from a Subversion checkout or the
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]50main LLVM web page, this document applies to the <i>next</i> release, not the
51current one. To see the release notes for a specific releases, please see the
52<a href="http://llvm.org/releases/">releases page</a>.</p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]53
54</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]55
56<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]57<div class="doc_section">
58 <a name="whatsnew">What's New?</a>
59</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]60<!-- *********************************************************************** -->
61
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]62<div class="doc_text">
63
Chris Lattner000c73b2008-02-06 06:30:34 +0000[diff] [blame]64<p>This is the thirteenth public release of the LLVM Compiler Infrastructure.
65It includes many features and refinements from LLVM 2.1.</p>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]66
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]67</div>
68
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]69<!--=========================================================================-->
Chris Lattner8a458762005-05-15 05:44:51 +0000[diff] [blame]70<div class="doc_subsection">
Chris Lattnerb4c68cd2008-02-10 07:04:35 +0000[diff] [blame^]71<a name="deprecation">Deprecated features in LLVM 2.2</a>
72</div>
73
74<div class="doc_text">
75
76<p>This is the last LLVM release to support llvm-gcc 4.0, llvm-upgrade, and
77llvmc in its current form. llvm-gcc 4.0 has been replaced with llvm-gcc 4.2.
78llvm-upgrade is useful for upgrading llvm 1.9 files to llvm 2.x syntax, but you
79can always use an old release to do this. llvmc is currently mostly useless in
80llvm 2.2, and will be redesigned or removed in llvm 2.3.</p>
81
82</div>
83
84<!--=========================================================================-->
85<div class="doc_subsection">
Chris Lattner000c73b2008-02-06 06:30:34 +0000[diff] [blame]86<a name="frontends">llvm-gcc 4.0, llvm-gcc 4.2, and clang</a>
Chris Lattner44c933e2006-04-18 06:18:36 +0000[diff] [blame]87</div>
88
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]89<div class="doc_text">
Chris Lattner60893e52007-05-18 06:33:02 +0000[diff] [blame]90
Chris Lattner000c73b2008-02-06 06:30:34 +0000[diff] [blame]91<p>LLVM 2.2 fully supports both the llvm-gcc 4.0 and llvm-gcc 4.2 front-ends (in
92LLVM 2.1, llvm-gcc 4.2 was beta). Since LLVM 2.1, the llvm-gcc 4.2 front-end
93has made leaps and bounds and is now at least as good as 4.0 in virtually every
94area, and is better in several areas (for example, exception handling
95correctness). We strongly recommend that you migrate from llvm-gcc 4.0 to
96llvm-gcc 4.2 in this release cycle because <b>LLVM 2.2 is the last release
97that will support llvm-gcc 4.0</b>: LLVM 2.3 will only support the llvm-gcc
984.2 front-end.</p>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]99
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]100<p>The <a href="http://clang.llvm.org/">clang project</a> is an effort to build
101a set of new 'llvm native' front-end technologies for the LLVM optimizer
102and code generator. Currently, its C and Objective-C support is maturing
103nicely, and it has advanced source-to-source analysis and transformation
104capabilities. If you are interested in building source-level tools for C and
105Objective-C (and eventually C++), you should take a look. However, note that
106clang is not an official part of the LLVM 2.2 release. If you are interested in
107this project, please see the web site.</p>
108
109</div>
110
111<!--=========================================================================-->
112<div class="doc_subsection">
113<a name="majorfeatures">Major New Features</a>
114</div>
115
116<div class="doc_text">
117
Chris Lattnerb4c68cd2008-02-10 07:04:35 +0000[diff] [blame^]118<p>Scott Michel contributed Cell backend</p>
119
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]120<p>Dale contributed full support for long double on x86/x86-64 (where it is 80
121bits) and on Darwin PPC/PPC64 (where it is 128 bits).</p>
122
123<p>Ada, gfortran</p>
124
125<p>
126debug improvements -O0
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]127
128Gordon: GC Revamp. docs/GarbageCollection.html
129
Chris Lattner313d61f2008-02-09 22:58:07 +0000[diff] [blame]130Kaleidoscope: docs/tutorial
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]131
132Gordon: C and Ocaml Bindings
Chris Lattner60893e52007-05-18 06:33:02 +0000[diff] [blame]133
Chris Lattner313d61f2008-02-09 22:58:07 +0000[diff] [blame]134Christopher Lamb: Multiple address spaces.
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]135</div>
136
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]137<!--=========================================================================-->
138<div class="doc_subsection">
139<a name="optimizer">Optimizer Improvements</a>
140</div>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]141
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]142<div class="doc_text">
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]143
Chris Lattnerd4298712007-09-26 05:44:21 +0000[diff] [blame]144<p>Some of the most noticable feature improvements this release have been in the
145optimizer, speeding it up and making it more aggressive. For example:</p>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]146
147<ul>
Tanya Lattnerb6ec3a92007-05-16 23:25:46 +0000[diff] [blame]148
Chris Lattner313d61f2008-02-09 22:58:07 +0000[diff] [blame]149<li>Daniel Berlin and Curtis Dunham rewrote Andersen's alias analysis (which is
150not enabled by default) to be several orders of magnitude faster, implemented
Chris Lattnerb4c68cd2008-02-10 07:04:35 +0000[diff] [blame^]151Offline Variable Substitution and Lazy Cycle Detection.</li>
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]152
153Devang: LoopIndexSplit is enabled by default.
Chris Lattner313d61f2008-02-09 22:58:07 +0000[diff] [blame]154
155Dan Gohman: LSR improvements for SSE intrinsics and
156
157Evan added simple exit value substitution to LSR.
158
Chris Lattnerb4c68cd2008-02-10 07:04:35 +0000[diff] [blame^]159Anton added readnone/readonly attributes for modeling function side effects
160and Duncan hooked up GCC's pure/const attributes to use them and enhanced alias
161analysis to use them.
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]162</ul>
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]163
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]164</div>
165
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]166<!--=========================================================================-->
167<div class="doc_subsection">
168<a name="codegen">Code Generator Improvements</a>
169</div>
170
171<div class="doc_text">
172
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]173<p>foci of this release was performance tuning and bug
Chris Lattnerd4298712007-09-26 05:44:21 +0000[diff] [blame]174 fixing. In addition to these, several new major changes occurred:</p>
175
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]176<ul>
177
Chris Lattner6b1a4ec2008-02-06 18:32:06 +0000[diff] [blame]178<li>Owen contributed Machine Loop info, domintors, etc. Merged dom and
179 postdom.</li>
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]180
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]181<li>Dan added support for emitting debug information with .file and .loc on
182targets that support it</li>
183
184<li>Evan physical register dependencies in the BURR scheduler</li>
Chris Lattner6b1a4ec2008-02-06 18:32:06 +0000[diff] [blame]185
186<li>Evan EXTRACT_SUBREG coalescing support</li>
Chris Lattner313d61f2008-02-09 22:58:07 +0000[diff] [blame]187<li>Evan enhanced LSR to support induction variable reuse when the induction
188 variables have different widths.</li>
189
Chris Lattnerb4c68cd2008-02-10 07:04:35 +0000[diff] [blame^]190<li>Rafael Espindola byval support, finished by Evan for x86 (32/64).</li>
Chris Lattner313d61f2008-02-09 22:58:07 +0000[diff] [blame]191
Chris Lattnerb4c68cd2008-02-10 07:04:35 +0000[diff] [blame^]192<li>mod/ref info for machineinstrs, inferred from .td files</li>
Chris Lattner313d61f2008-02-09 22:58:07 +0000[diff] [blame]193
194<li>Evan: Live interval splitting on MBB boundaries.</li>
Chris Lattnerb4c68cd2008-02-10 07:04:35 +0000[diff] [blame^]195
196Efficient iteration over use/defs of registers like llvm ir.
197
198The MachineInstr, MachineOperand and TargetInstrDesc classes are simpler, more
199consistent, and better documented.
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]200</ul>
201
202</div>
203
204
205<!--=========================================================================-->
206<div class="doc_subsection">
207<a name="targetspecific">Target Specific Improvements</a>
208</div>
Chris Lattner60893e52007-05-18 06:33:02 +0000[diff] [blame]209
Chris Lattner738bd302006-04-18 06:32:08 +0000[diff] [blame]210<div class="doc_text">
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]211<p>New features include:
212</p>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]213
214<ul>
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]215<li>Evan X86 now models EFLAGS in instructions.</li>
216<li>Evan: If conversion on by default for ARM.</li>
Chris Lattner6b1a4ec2008-02-06 18:32:06 +0000[diff] [blame]217<li>Bruno: MIPS PIC support.</li>
218<li>Arnold Schwaighofer: X86 tail call support.</li>
Chris Lattner313d61f2008-02-09 22:58:07 +0000[diff] [blame]219<li>Dale darwin/x86-64 and darwin/ppc eh</li>
220<li>Evan: darwin/x86 debug info</li>
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]221</ul>
222
223</div>
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]224
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]225
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]226<!--=========================================================================-->
227<div class="doc_subsection">
228<a name="llvmgccimprovements">llvm-gcc Improvements</a>
229</div>
Tanya Lattnerb6ec3a92007-05-16 23:25:46 +0000[diff] [blame]230
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]231<div class="doc_text">
232<p>New features include:
233</p>
Tanya Lattnerb6ec3a92007-05-16 23:25:46 +0000[diff] [blame]234
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]235<ul>
Chris Lattner000c73b2008-02-06 06:30:34 +0000[diff] [blame]236<li>.</li>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]237</ul>
238
Chris Lattner738bd302006-04-18 06:32:08 +0000[diff] [blame]239</div>
240
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]241
242<!--=========================================================================-->
243<div class="doc_subsection">
244<a name="coreimprovements">LLVM Core Improvements</a>
245</div>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]246
Chris Lattner1c1a85c2006-04-19 04:02:47 +0000[diff] [blame]247<div class="doc_text">
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]248<p>New features include:
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]249</p>
250
251<ul>
Chris Lattner6b1a4ec2008-02-06 18:32:06 +0000[diff] [blame]252<li>Devang added LLVMFoldingBuilder.</li>
253<li>Dan added support for vector sin, cos, and pow intrinsics.</li>
Chris Lattner313d61f2008-02-09 22:58:07 +0000[diff] [blame]254<li>Ted added a framework for generic object serialization to bitcode files,
255 only used by clang right now for ASTs but could be used for other
256 stuff.</li>
257<li>Duncan fixed TargetData to distinguish between the size/alignment of a type
258 in a register, in memory according to the platform ABI, and in memory when
259 we have a choice.</li>
Chris Lattnerb4c68cd2008-02-10 07:04:35 +0000[diff] [blame^]260<li>Duncan moved parameter attributes off of function type and onto functions
261 and calls, which makes it much easier to add attributes to a function in a
262 transformation.</li>
Chris Lattnerbfb17ab2007-05-17 21:41:31 +0000[diff] [blame]263</ul>
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]264
Chris Lattnerbfb17ab2007-05-17 21:41:31 +0000[diff] [blame]265</div>
Chris Lattnerc5d658a2006-03-03 00:34:26 +0000[diff] [blame]266
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]267<!--=========================================================================-->
268<div class="doc_subsection">
269<a name="otherimprovements">Other Improvements</a>
270</div>
271
272<div class="doc_text">
273<p>New features include:
274</p>
275
276<ul>
Chris Lattner313d61f2008-02-09 22:58:07 +0000[diff] [blame]277<li>Gordon Henriksen updated docs/Passes.html</li>
278<li>New lexer and parser for tblgen, new lexer for asmparser</li>
Chris Lattnerb4c68cd2008-02-10 07:04:35 +0000[diff] [blame^]279<li>Dale GCC testsuite</li>
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]280</ul>
281
282</div>
Chris Lattnerc5d658a2006-03-03 00:34:26 +0000[diff] [blame]283
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]284<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]285<div class="doc_section">
286 <a name="portability">Portability and Supported Platforms</a>
287</div>
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]288<!-- *********************************************************************** -->
289
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]290<div class="doc_text">
291
John Criswell0b5b5e92004-12-08 20:35:47 +0000[diff] [blame]292<p>LLVM is known to work on the following platforms:</p>
Chris Lattner4654bdb2004-06-01 18:22:41 +0000[diff] [blame]293
294<ul>
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]295<li>Intel and AMD machines running Red Hat Linux, Fedora Core and FreeBSD
Reid Spencer00812e22005-05-17 02:47:27 +0000[diff] [blame]296 (and probably other unix-like systems).</li>
Chris Lattner000c73b2008-02-06 06:30:34 +0000[diff] [blame]297<li>PowerPC and X86-based Mac OS X systems, running 10.3 and above in 32-bit and
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]298 64-bit modes.</li>
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]299<li>Intel and AMD machines running on Win32 using MinGW libraries (native).</li>
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]300<li>Intel and AMD machines running on Win32 with the Cygwin libraries (limited
301 support is available for native builds with Visual C++).</li>
302<li>Sun UltraSPARC workstations running Solaris 8.</li>
John Criswell9321fa82005-05-13 20:28:15 +0000[diff] [blame]303<li>Alpha-based machines running Debian GNU/Linux.</li>
304<li>Itanium-based machines running Linux and HP-UX.</li>
Chris Lattner4654bdb2004-06-01 18:22:41 +0000[diff] [blame]305</ul>
306
Brian Gaekeb0fd7612004-05-09 05:28:35 +0000[diff] [blame]307<p>The core LLVM infrastructure uses
308<a href="http://www.gnu.org/software/autoconf/">GNU autoconf</a> to adapt itself
309to the machine and operating system on which it is built. However, minor
310porting may be required to get LLVM to work on new platforms. We welcome your
311portability patches and reports of successful builds or error messages.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]312
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]313</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]314
315<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]316<div class="doc_section">
317 <a name="knownproblems">Known Problems</a>
318</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]319<!-- *********************************************************************** -->
320
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]321<div class="doc_text">
322
323<p>This section contains all known problems with the LLVM system, listed by
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]324component. As new problems are discovered, they will be added to these
Chris Lattner5eccca42003-12-12 21:22:16 +0000[diff] [blame]325sections. If you run into a problem, please check the <a
Chris Lattnerc463b272005-10-29 07:07:09 +0000[diff] [blame]326href="http://llvm.org/bugs/">LLVM bug database</a> and submit a bug if
Chris Lattner5eccca42003-12-12 21:22:16 +0000[diff] [blame]327there isn't already one.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]328
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]329</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]330
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]331<!-- ======================================================================= -->
332<div class="doc_subsection">
333 <a name="experimental">Experimental features included with this release</a>
334</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]335
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]336<div class="doc_text">
337
Misha Brukman6df9e2c2004-05-12 21:46:05 +0000[diff] [blame]338<p>The following components of this LLVM release are either untested, known to
339be broken or unreliable, or are in early development. These components should
340not be relied on, and bugs should not be filed against them, but they may be
341useful to some people. In particular, if you would like to work on one of these
Chris Lattner49e693e2006-08-09 04:08:52 +0000[diff] [blame]342components, please contact us on the <a href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVMdev list</a>.</p>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]343
344<ul>
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]345<li>The <tt>-cee</tt> pass is known to be buggy and will be removed in
346 LLVM 2.3.</li>
Chris Lattner000c73b2008-02-06 06:30:34 +0000[diff] [blame]347<li>The MSIL, IA64, Alpha, and MIPS backends are experimental.</li>
348<li>The LLC "<tt>-filetype=asm</tt>" (the default) is the only supported
349 value for this option.</li>
350<li>The llvmc tool is not supported.</li>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]351</ul>
352
353</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]354
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]355<!-- ======================================================================= -->
356<div class="doc_subsection">
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]357 <a name="x86-be">Known problems with the X86 back-end</a>
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]358</div>
359
360<div class="doc_text">
361
362<ul>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]363<li>The X86 backend does not yet support <a href="http://llvm.org/PR879">inline
Chris Lattnercaf06342007-05-09 04:58:11 +0000[diff] [blame]364 assembly that uses the X86 floating point stack</a>.</li>
Chris Lattner725a0d82007-09-26 06:01:35 +0000[diff] [blame]365<li>The X86 backend occasionally has <a href="http://llvm.org/PR1649">alignment
366 problems</a> on operating systems that don't require 16-byte stack alignment
367 (including most non-darwin OS's like linux).</li>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]368</ul>
369
370</div>
371
372<!-- ======================================================================= -->
373<div class="doc_subsection">
374 <a name="ppc-be">Known problems with the PowerPC back-end</a>
375</div>
376
377<div class="doc_text">
378
379<ul>
Nicolas Geoffraye4285dc2007-05-15 09:21:28 +0000[diff] [blame]380<li>The Linux PPC32/ABI support needs testing for the interpreter and static
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]381compilation, and lacks support for debug information.</li>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]382</ul>
383
384</div>
385
386<!-- ======================================================================= -->
387<div class="doc_subsection">
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]388 <a name="arm-be">Known problems with the ARM back-end</a>
389</div>
390
391<div class="doc_text">
392
393<ul>
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]394<li>Thumb mode works only on ARMv6 or higher processors. On sub-ARMv6
Duncan Sandsc90d68b2007-09-26 15:59:54 +0000[diff] [blame]395processors, thumb programs can crash or produce wrong
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]396results (<a href="http://llvm.org/PR1388">PR1388</a>).</li>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]397<li>Compilation for ARM Linux OABI (old ABI) is supported, but not fully tested.
398</li>
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]399<li>There is a bug in QEMU-ARM (<= 0.9.0) which causes it to incorrectly execute
400programs compiled with LLVM. Please use more recent versions of QEMU.</li>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]401</ul>
402
403</div>
404
405<!-- ======================================================================= -->
406<div class="doc_subsection">
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]407 <a name="sparc-be">Known problems with the SPARC back-end</a>
408</div>
409
410<div class="doc_text">
411
412<ul>
413<li>The SPARC backend only supports the 32-bit SPARC ABI (-m32), it does not
414 support the 64-bit SPARC ABI (-m64).</li>
415</ul>
416
417</div>
418
419<!-- ======================================================================= -->
420<div class="doc_subsection">
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]421 <a name="alpha-be">Known problems with the Alpha back-end</a>
422</div>
423
424<div class="doc_text">
425
426<ul>
427
428<li>On 21164s, some rare FP arithmetic sequences which may trap do not have the
429appropriate nops inserted to ensure restartability.</li>
430
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]431</ul>
432</div>
433
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]434<!-- ======================================================================= -->
435<div class="doc_subsection">
436 <a name="ia64-be">Known problems with the IA64 back-end</a>
437</div>
438
439<div class="doc_text">
440
441<ul>
442
443<li>C++ programs are likely to fail on IA64, as calls to <tt>setjmp</tt> are
444made where the argument is not 16-byte aligned, as required on IA64. (Strictly
445speaking this is not a bug in the IA64 back-end; it will also be encountered
446when building C++ programs using the C back-end.)</li>
447
448<li>The C++ front-end does not use <a href="http://llvm.org/PR406">IA64
449ABI compliant layout of v-tables</a>. In particular, it just stores function
450pointers instead of function descriptors in the vtable. This bug prevents
451mixing C++ code compiled with LLVM with C++ objects compiled by other C++
452compilers.</li>
453
454<li>There are a few ABI violations which will lead to problems when mixing LLVM
455output with code built with other compilers, particularly for floating-point
456programs.</li>
457
458<li>Defining vararg functions is not supported (but calling them is ok).</li>
459
Chris Lattnercaf06342007-05-09 04:58:11 +0000[diff] [blame]460<li>The Itanium backend has bitrotted somewhat.</li>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]461</ul>
462
463</div>
464
465<!-- ======================================================================= -->
466<div class="doc_subsection">
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]467 <a name="c-be">Known problems with the C back-end</a>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]468</div>
469
470<div class="doc_text">
471
472<ul>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]473<li><a href="http://llvm.org/PR802">The C backend does not support inline
474 assembly code</a>.</li>
Chris Lattner725a0d82007-09-26 06:01:35 +0000[diff] [blame]475<li><a href="http://llvm.org/PR1126">The C backend does not support vectors
476 yet</a>.</li>
Chris Lattner725a0d82007-09-26 06:01:35 +0000[diff] [blame]477<li><a href="http://llvm.org/PR1658">The C backend violates the ABI of common
478 C++ programs</a>, preventing intermixing between C++ compiled by the CBE and
479 C++ code compiled with LLC or native compilers.</li>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]480</ul>
481
482</div>
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]483
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]484
485<!-- ======================================================================= -->
486<div class="doc_subsection">
487 <a name="c-fe">Known problems with the C front-end</a>
488</div>
Chris Lattner47588f92003-10-02 05:07:23 +0000[diff] [blame]489
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]490<!-- _______________________________________________________________________ -->
Chris Lattnerb40efb32003-12-14 05:03:43 +0000[diff] [blame]491<div class="doc_subsubsection">Bugs</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]492
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]493<div class="doc_text">
Chris Lattnerc5d658a2006-03-03 00:34:26 +0000[diff] [blame]494
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]495<p>llvm-gcc does not currently support <a href="http://llvm.org/PR869">Link-Time
496Optimization</a> on most platforms "out-of-the-box". Please inquire on the
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]497llvmdev mailing list if you are interested.</p>
Chris Lattnerd9ea0172006-08-08 17:27:28 +0000[diff] [blame]498
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]499</div>
500
501<!-- _______________________________________________________________________ -->
502<div class="doc_subsubsection">
503 Notes
504</div>
505
506<div class="doc_text">
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]507<ul>
508
Chris Lattnerd09c4ec2007-05-17 22:02:24 +0000[diff] [blame]509<li><p>llvm-gcc does <b>not</b> support <tt>__builtin_apply</tt> yet.
510 See <a href="http://gcc.gnu.org/onlinedocs/gcc/Constructing-Calls.html#Constructing%20Calls">Constructing Calls</a>: Dispatching a call to another function.</p>
511</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]512
Duncan Sands32a83442007-05-18 09:04:20 +0000[diff] [blame]513<li><p>llvm-gcc <b>partially</b> supports these GCC extensions:</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]514 <ol>
Duncan Sandsc90d68b2007-09-26 15:59:54 +0000[diff] [blame]515 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Nested-Functions.html#Nested%20Functions">Nested Functions</a>:
516
517 As in Algol and Pascal, lexical scoping of functions.
518 Nested functions are supported, but llvm-gcc does not support
Duncan Sands0869f4a2007-09-26 16:24:52 +0000[diff] [blame]519 taking the address of a nested function (except on the X86-32 target)
Duncan Sandsc90d68b2007-09-26 15:59:54 +0000[diff] [blame]520 or non-local gotos.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]521
522 <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]523
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]524 Declaring that functions have no side effects or that they can never
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]525 return.<br>
526
Anton Korobeynikovbe6fe282007-11-16 11:12:01 +0000[diff] [blame]527 <b>Supported:</b> <tt>alias</tt>, <tt>always_inline</tt>, <tt>cdecl</tt>,
528 <tt>const</tt>, <tt>constructor</tt>, <tt>destructor</tt>,
Anton Korobeynikov9413de32006-11-18 08:04:48 +0000[diff] [blame]529 <tt>deprecated</tt>, <tt>fastcall</tt>, <tt>format</tt>,
Anton Korobeynikovbe6fe282007-11-16 11:12:01 +0000[diff] [blame]530 <tt>format_arg</tt>, <tt>non_null</tt>, <tt>noinline</tt>,
531 <tt>noreturn</tt>, <tt>pure</tt>, <tt>regparm</tt>
Anton Korobeynikov8cea37b2007-01-23 12:35:46 +0000[diff] [blame]532 <tt>section</tt>, <tt>stdcall</tt>, <tt>unused</tt>, <tt>used</tt>,
533 <tt>visibility</tt>, <tt>warn_unused_result</tt>, <tt>weak</tt><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]534
Anton Korobeynikovbe6fe282007-11-16 11:12:01 +0000[diff] [blame]535 <b>Ignored:</b> <tt>nothrow</tt>, <tt>malloc</tt>,
536 <tt>no_instrument_function</tt></li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]537 </ol>
Chris Lattnerd09c4ec2007-05-17 22:02:24 +0000[diff] [blame]538</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]539
Chris Lattnerd09c4ec2007-05-17 22:02:24 +0000[diff] [blame]540<li><p>llvm-gcc supports the vast majority of GCC extensions, including:</p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]541
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]542 <ol>
Chris Lattnerd09c4ec2007-05-17 22:02:24 +0000[diff] [blame]543 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Pragmas.html#Pragmas">Pragmas</a>: Pragmas accepted by GCC.</li>
544 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Local-Labels.html#Local%20Labels">Local Labels</a>: Labels local to a block.</li>
545 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html#Other%20Builtins">Other Builtins</a>:
546 Other built-in functions.</li>
547 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Attributes.html#Variable%20Attributes">Variable Attributes</a>:
548 Specifying attributes of variables.</li>
549 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Type-Attributes.html#Type%20Attributes">Type Attributes</a>: Specifying attributes of types.</li>
550 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Thread_002dLocal.html">Thread-Local</a>: Per-thread variables.</li>
551 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Length.html#Variable%20Length">Variable Length</a>:
552 Arrays whose length is computed at run time.</li>
Chris Lattner7fe97dd2004-03-16 08:54:07 +0000[diff] [blame]553 <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 Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]554 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html#Statement%20Exprs">Statement Exprs</a>: Putting statements and declarations inside expressions.</li>
555 <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 Lattnerca26c3e2004-06-22 03:48:17 +0000[diff] [blame]556 <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 Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]557 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Conditionals.html#Conditionals">Conditionals</a>: Omitting the middle operand of a <code>?:</code> expression.</li>
558 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Long-Long.html#Long%20Long">Long Long</a>: Double-word integers.</li>
559 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Complex.html#Complex">Complex</a>: Data types for complex numbers.</li>
560 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Hex-Floats.html#Hex%20Floats">Hex Floats</a>:Hexadecimal floating-point constants.</li>
561 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html#Zero%20Length">Zero Length</a>: Zero-length arrays.</li>
562 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Empty-Structures.html#Empty%20Structures">Empty Structures</a>: Structures with no members.</li>
563 <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>
564 <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 Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]565 <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>
566 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Constraints.html#Constraints">Constraints</a>: Constraints for asm operands.</li>
567 <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>
568 <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>
569 <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>
570 <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 Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]571 <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 Brukmanc4b7bee2003-12-12 04:37:31 +0000[diff] [blame]572 <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 Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]573 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Initializers.html#Initializers">Initializers</a>: Non-constant initializers.</li>
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]574 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Compound-Literals.html#Compound%20Literals">Compound Literals</a>: Compound literals give structures, unions,
575or arrays as values.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]576 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Designated-Inits.html#Designated%20Inits">Designated Inits</a>: Labeling elements of initializers.</li>
Misha Brukmanc4b7bee2003-12-12 04:37:31 +0000[diff] [blame]577 <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 Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]578 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Case-Ranges.html#Case%20Ranges">Case Ranges</a>: `case 1 ... 9' and such.</li>
579 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Mixed-Declarations.html#Mixed%20Declarations">Mixed Declarations</a>: Mixing declarations and code.</li>
580 <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 Lattner78537e42004-12-08 18:29:38 +0000[diff] [blame]581 <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 Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]582 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Dollar-Signs.html#Dollar%20Signs">Dollar Signs</a>: Dollar sign is allowed in identifiers.</li>
583 <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>
584 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Alignment.html#Alignment">Alignment</a>: Inquiring about the alignment of a type or variable.</li>
585 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Inline.html#Inline">Inline</a>: Defining inline functions (as fast as macros).</li>
586 <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>
587 <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>
588 <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 Lattner25795bc2004-02-14 04:08:29 +0000[diff] [blame]589 <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 Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]590 <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>
591 <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]592 </ol></li>
593
594</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]595
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]596<p>If you run into GCC extensions which have not been included in any of these
597lists, please let us know (also including whether or not they work).</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]598
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]599</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]600
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]601<!-- ======================================================================= -->
602<div class="doc_subsection">
603 <a name="c++-fe">Known problems with the C++ front-end</a>
604</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]605
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]606<div class="doc_text">
607
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]608<p>The C++ front-end is considered to be fully
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame]609tested and works for a number of non-trivial programs, including LLVM
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]610itself, Qt, Mozilla, etc.</p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]611
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]612<ul>
Chris Lattner000c73b2008-02-06 06:30:34 +0000[diff] [blame]613<li>Exception handling only works well on the X86 and PowerPC targets.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]614</ul>
Chris Lattnerfcc54b32003-10-07 22:14:37 +0000[diff] [blame]615
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]616</div>
617
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]618
Chris Lattner98a493c2005-05-15 16:01:20 +0000[diff] [blame]619
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]620<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]621<div class="doc_section">
622 <a name="additionalinfo">Additional Information</a>
623</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]624<!-- *********************************************************************** -->
625
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]626<div class="doc_text">
627
Chris Lattner416db102005-05-16 17:13:10 +0000[diff] [blame]628<p>A wide variety of additional information is available on the <a
Chris Lattnerb4b0ce72007-05-18 00:44:29 +0000[diff] [blame]629href="http://llvm.org">LLVM web page</a>, in particular in the <a
630href="http://llvm.org/docs/">documentation</a> section. The web page also
Reid Spencer669ed452007-07-09 08:04:31 +0000[diff] [blame]631contains versions of the API documentation which is up-to-date with the
632Subversion version of the source code.
Misha Brukman109d9e82005-03-30 19:14:24 +0000[diff] [blame]633You can access versions of these documents specific to this release by going
634into the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]635
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]636<p>If you have any questions or comments about LLVM, please feel free to contact
Chris Lattnerc463b272005-10-29 07:07:09 +0000[diff] [blame]637us via the <a href="http://llvm.org/docs/#maillist"> mailing
Chris Lattner5eccca42003-12-12 21:22:16 +0000[diff] [blame]638lists</a>.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]639
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]640</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]641
642<!-- *********************************************************************** -->
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]643
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]644<hr>
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]645<address>
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Chris Lattnerb4b0ce72007-05-18 00:44:29 +0000[diff] [blame]651 <a href="http://llvm.org/">LLVM Compiler Infrastructure</a><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]652 Last modified: $Date$
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