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gerrit-public.fairphone.software / fp2-dev / platform / external / llvm / acce85def4285cd8aa646c5db3386ca27c20ddfd / . / 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 Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame^]69<!-- Unfinished features in 2.2:
70 Index Set Splitting not enabled by default
71 Machine LICM
72 Machine Sinking
73 LegalizeDAGTypes
74 -->
75
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]76<!--=========================================================================-->
Chris Lattner8a458762005-05-15 05:44:51 +0000[diff] [blame]77<div class="doc_subsection">
Chris Lattnerb4c68cd2008-02-10 07:04:35 +0000[diff] [blame]78<a name="deprecation">Deprecated features in LLVM 2.2</a>
79</div>
80
81<div class="doc_text">
82
83<p>This is the last LLVM release to support llvm-gcc 4.0, llvm-upgrade, and
84llvmc in its current form. llvm-gcc 4.0 has been replaced with llvm-gcc 4.2.
85llvm-upgrade is useful for upgrading llvm 1.9 files to llvm 2.x syntax, but you
86can always use an old release to do this. llvmc is currently mostly useless in
87llvm 2.2, and will be redesigned or removed in llvm 2.3.</p>
88
89</div>
90
91<!--=========================================================================-->
92<div class="doc_subsection">
Chris Lattner000c73b2008-02-06 06:30:34 +0000[diff] [blame]93<a name="frontends">llvm-gcc 4.0, llvm-gcc 4.2, and clang</a>
Chris Lattner44c933e2006-04-18 06:18:36 +0000[diff] [blame]94</div>
95
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]96<div class="doc_text">
Chris Lattner60893e52007-05-18 06:33:02 +0000[diff] [blame]97
Chris Lattner000c73b2008-02-06 06:30:34 +0000[diff] [blame]98<p>LLVM 2.2 fully supports both the llvm-gcc 4.0 and llvm-gcc 4.2 front-ends (in
99LLVM 2.1, llvm-gcc 4.2 was beta). Since LLVM 2.1, the llvm-gcc 4.2 front-end
100has made leaps and bounds and is now at least as good as 4.0 in virtually every
101area, and is better in several areas (for example, exception handling
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame^]102correctness, support for Ada and FORTRAN). We strongly recommend that you
103migrate from llvm-gcc 4.0 to llvm-gcc 4.2 in this release cycle because
104<b>LLVM 2.2 is the last release that will support llvm-gcc 4.0</b>: LLVM 2.3
105will only support the llvm-gcc 4.2 front-end.</p>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]106
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]107<p>The <a href="http://clang.llvm.org/">clang project</a> is an effort to build
108a set of new 'llvm native' front-end technologies for the LLVM optimizer
109and code generator. Currently, its C and Objective-C support is maturing
110nicely, and it has advanced source-to-source analysis and transformation
111capabilities. If you are interested in building source-level tools for C and
112Objective-C (and eventually C++), you should take a look. However, note that
113clang is not an official part of the LLVM 2.2 release. If you are interested in
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame^]114this project, please see its <a href="http://clang.llvm.org/">web site</a>.</p>
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]115
116</div>
117
118<!--=========================================================================-->
119<div class="doc_subsection">
120<a name="majorfeatures">Major New Features</a>
121</div>
122
123<div class="doc_text">
124
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame^]125<p>LLVM 2.2 includes several major new capabilities:</p>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]126
127<ul>
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame^]128<li>Scott Michel contributed an SPU backend, which generates code for the
129vector coprocessors on the Cell processor. (Status?)</li>
Tanya Lattnerb6ec3a92007-05-16 23:25:46 +0000[diff] [blame]130
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame^]131<li>llvm-gcc 4.2 has significantly improved support for the GCC Ada (GNAT) and
132FORTRAN (gfortran) frontends. Duncan has the llvm-gcc 4.2 GNAT front-end
133supporting almost all of the ACATS testsuite (except 2 tests?). The llvm-gcc
1344.2 gfortran front-end supports a broad range of FORTRAN code, but does <a
135href="http://llvm.org/PR1971">not support EQUIVALENCE yet</a>.</li>
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]136
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame^]137<li>Dale contributed full support for long double on x86/x86-64 (where it is 80
138bits) and on Darwin PPC/PPC64 (where it is 128 bits). In previous LLVM
139releases, llvm-gcc silently mapped long double to double.</li>
Chris Lattner313d61f2008-02-09 22:58:07 +0000[diff] [blame]140
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame^]141<li>Gordon rewrote most of the <a href="GarbageCollection.html">Accurate Garbage
142Collection</a> code in the code generator, making the generated code more
143efficient and adding support for the Ocaml garbage collector metadata
144format.</li>
Chris Lattner313d61f2008-02-09 22:58:07 +0000[diff] [blame]145
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame^]146<li>LLVM now includes a new set of detailed <a
147href="tutorial/index.html">tutorials</a>, which explain how to implement a
148language with LLVM and shows how to use several important APIs.</li>
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]149
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]150</div>
151
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]152<!--=========================================================================-->
153<div class="doc_subsection">
154<a name="codegen">Code Generator Improvements</a>
155</div>
156
157<div class="doc_text">
158
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame^]159<p>We put a significant amount of work into the code generator infrastructure,
160which allows us to implement more aggressive algorithms and make it run
161faster:</p>
Chris Lattnerd4298712007-09-26 05:44:21 +0000[diff] [blame]162
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]163<ul>
164
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame^]165<li>Owen refactored the existing LLVM dominator and loop information code to
166allow it work on the machine code representation. He contributed support for
167dominator and loop information on machine code and merged the code for forward
168and backward dominator computation.</li>
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]169
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame^]170<li>Dan added support for emitting debug information with .file and .loc
171directives on that support it, instead of emitting large tables in the .s
172file.</li>
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]173
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame^]174<li>Evan extended the DAG scheduler to model physical register dependencies
175explicitly and have the BURR scheduler pick a correct schedule based on the
176dependencies. This reduces our use of the 'flag' operand hack.</li>
Chris Lattner6b1a4ec2008-02-06 18:32:06 +0000[diff] [blame]177
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame^]178<li>Evan added initial support for register coalescing of subregister
179references.</li>
180
181<li>Rafael Espindola implemented initial support for a new 'byval' attribute,
182which allows more efficient by-value argument passing in the LLVM IR. Evan
183finished support for it and enabled it in the X86 (32- and 64-bit) and C
184backends.</li>
185
186<li>The LLVM TargetInstrInfo class can now answer queries about the mod/ref and
187side-effect behavior of MachineInstr's. This information is inferred
188automatically by TableGen from .td files for all instructions with
189patterns.</li>
190
191<li>Evan implemented simple live interval splitting on basic block boundaries.
192This allows the register allocator to be more successful at keeping values in
193registers in some parts of a value's live range, even if they need to be spilled
194in some other block.</li>
195
196<li>The new MachineRegisterInfo.h class provides support for efficiently
197iterating over all defs/uses of a register, and this information is
198automatically kept up-to-date. This support is similar to the use_iterator in
199the LLVM IR level.</li>
200
201<li>The MachineInstr, MachineOperand and TargetInstrDesc classes are simpler,
202more consistent, and better documented.</li>
203</ul>
204
205</div>
206
207<!--=========================================================================-->
208<div class="doc_subsection">
209<a name="optimizer">Optimizer Improvements</a>
210</div>
211
212<div class="doc_text">
213
214<p>In addition to a huge array of bug fixes and minor performance tweaks, LLVM
2152.2 supports a few major enhancements:</p>
216
217<ul>
218
219<li>Daniel Berlin and Curtis Dunham rewrote Andersen's alias analysis to be
220several orders of magnitude faster, implemented Offline Variable Substitution
221and Lazy Cycle Detection. Note that Andersen's is not enabled in llvm-gcc by
222default.</li>
223
224<li>Dan Gohman contributed several enhancements to Loop Strength Reduction (LSR)
225to make it more aggressive with SSE intrinsics.</li>
226
227<li>Evan added support for simple exit value substitution to LSR.</li>
228
Chris Lattner313d61f2008-02-09 22:58:07 +0000[diff] [blame]229<li>Evan enhanced LSR to support induction variable reuse when the induction
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame^]230variables have different widths.</li>
Chris Lattner313d61f2008-02-09 22:58:07 +0000[diff] [blame]231
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]232</ul>
233
234</div>
235
236
237<!--=========================================================================-->
238<div class="doc_subsection">
239<a name="targetspecific">Target Specific Improvements</a>
240</div>
Chris Lattner60893e52007-05-18 06:33:02 +0000[diff] [blame]241
Chris Lattner738bd302006-04-18 06:32:08 +0000[diff] [blame]242<div class="doc_text">
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]243<p>New features include:
244</p>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]245
246<ul>
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]247<li>Evan X86 now models EFLAGS in instructions.</li>
248<li>Evan: If conversion on by default for ARM.</li>
Chris Lattner6b1a4ec2008-02-06 18:32:06 +0000[diff] [blame]249<li>Bruno: MIPS PIC support.</li>
250<li>Arnold Schwaighofer: X86 tail call support.</li>
Chris Lattner313d61f2008-02-09 22:58:07 +0000[diff] [blame]251<li>Dale darwin/x86-64 and darwin/ppc eh</li>
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame^]252<li>Evan: darwin/x86 debug info, improvements at -O0?</li>
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]253</ul>
254
255</div>
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]256
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]257<!--=========================================================================-->
258<div class="doc_subsection">
259<a name="coreimprovements">LLVM Core Improvements</a>
260</div>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]261
Chris Lattner1c1a85c2006-04-19 04:02:47 +0000[diff] [blame]262<div class="doc_text">
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]263<p>New features include:
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]264</p>
265
266<ul>
Chris Lattner6b1a4ec2008-02-06 18:32:06 +0000[diff] [blame]267<li>Devang added LLVMFoldingBuilder.</li>
268<li>Dan added support for vector sin, cos, and pow intrinsics.</li>
Chris Lattner313d61f2008-02-09 22:58:07 +0000[diff] [blame]269<li>Ted added a framework for generic object serialization to bitcode files,
270 only used by clang right now for ASTs but could be used for other
271 stuff.</li>
272<li>Duncan fixed TargetData to distinguish between the size/alignment of a type
273 in a register, in memory according to the platform ABI, and in memory when
274 we have a choice.</li>
Chris Lattnerb4c68cd2008-02-10 07:04:35 +0000[diff] [blame]275<li>Duncan moved parameter attributes off of function type and onto functions
276 and calls, which makes it much easier to add attributes to a function in a
277 transformation.</li>
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame^]278<li>Christopher Lamb: Multiple address spaces.</li>
279<li>Gordon: C and Ocaml Bindings</li>
280
281<li>Anton added readnone/readonly attributes for modeling function side effects
282and Duncan hooked up GCC's pure/const attributes to use them and enhanced alias
283analysis to use them.</li>
284
Chris Lattnerbfb17ab2007-05-17 21:41:31 +0000[diff] [blame]285</ul>
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]286
Chris Lattnerbfb17ab2007-05-17 21:41:31 +0000[diff] [blame]287</div>
Chris Lattnerc5d658a2006-03-03 00:34:26 +0000[diff] [blame]288
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]289<!--=========================================================================-->
290<div class="doc_subsection">
291<a name="otherimprovements">Other Improvements</a>
292</div>
293
294<div class="doc_text">
295<p>New features include:
296</p>
297
298<ul>
Chris Lattner313d61f2008-02-09 22:58:07 +0000[diff] [blame]299<li>Gordon Henriksen updated docs/Passes.html</li>
300<li>New lexer and parser for tblgen, new lexer for asmparser</li>
Chris Lattnerb4c68cd2008-02-10 07:04:35 +0000[diff] [blame]301<li>Dale GCC testsuite</li>
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]302</ul>
303
304</div>
Chris Lattnerc5d658a2006-03-03 00:34:26 +0000[diff] [blame]305
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]306<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]307<div class="doc_section">
308 <a name="portability">Portability and Supported Platforms</a>
309</div>
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]310<!-- *********************************************************************** -->
311
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]312<div class="doc_text">
313
John Criswell0b5b5e92004-12-08 20:35:47 +0000[diff] [blame]314<p>LLVM is known to work on the following platforms:</p>
Chris Lattner4654bdb2004-06-01 18:22:41 +0000[diff] [blame]315
316<ul>
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]317<li>Intel and AMD machines running Red Hat Linux, Fedora Core and FreeBSD
Reid Spencer00812e22005-05-17 02:47:27 +0000[diff] [blame]318 (and probably other unix-like systems).</li>
Chris Lattner000c73b2008-02-06 06:30:34 +0000[diff] [blame]319<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]320 64-bit modes.</li>
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]321<li>Intel and AMD machines running on Win32 using MinGW libraries (native).</li>
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]322<li>Intel and AMD machines running on Win32 with the Cygwin libraries (limited
323 support is available for native builds with Visual C++).</li>
324<li>Sun UltraSPARC workstations running Solaris 8.</li>
John Criswell9321fa82005-05-13 20:28:15 +0000[diff] [blame]325<li>Alpha-based machines running Debian GNU/Linux.</li>
326<li>Itanium-based machines running Linux and HP-UX.</li>
Chris Lattner4654bdb2004-06-01 18:22:41 +0000[diff] [blame]327</ul>
328
Brian Gaekeb0fd7612004-05-09 05:28:35 +0000[diff] [blame]329<p>The core LLVM infrastructure uses
330<a href="http://www.gnu.org/software/autoconf/">GNU autoconf</a> to adapt itself
331to the machine and operating system on which it is built. However, minor
332porting may be required to get LLVM to work on new platforms. We welcome your
333portability patches and reports of successful builds or error messages.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]334
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]335</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]336
337<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]338<div class="doc_section">
339 <a name="knownproblems">Known Problems</a>
340</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]341<!-- *********************************************************************** -->
342
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]343<div class="doc_text">
344
345<p>This section contains all known problems with the LLVM system, listed by
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]346component. As new problems are discovered, they will be added to these
Chris Lattner5eccca42003-12-12 21:22:16 +0000[diff] [blame]347sections. If you run into a problem, please check the <a
Chris Lattnerc463b272005-10-29 07:07:09 +0000[diff] [blame]348href="http://llvm.org/bugs/">LLVM bug database</a> and submit a bug if
Chris Lattner5eccca42003-12-12 21:22:16 +0000[diff] [blame]349there isn't already one.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]350
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]351</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]352
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]353<!-- ======================================================================= -->
354<div class="doc_subsection">
355 <a name="experimental">Experimental features included with this release</a>
356</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]357
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]358<div class="doc_text">
359
Misha Brukman6df9e2c2004-05-12 21:46:05 +0000[diff] [blame]360<p>The following components of this LLVM release are either untested, known to
361be broken or unreliable, or are in early development. These components should
362not be relied on, and bugs should not be filed against them, but they may be
363useful 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]364components, 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]365
366<ul>
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]367<li>The <tt>-cee</tt> pass is known to be buggy and will be removed in
368 LLVM 2.3.</li>
Chris Lattner000c73b2008-02-06 06:30:34 +0000[diff] [blame]369<li>The MSIL, IA64, Alpha, and MIPS backends are experimental.</li>
370<li>The LLC "<tt>-filetype=asm</tt>" (the default) is the only supported
371 value for this option.</li>
372<li>The llvmc tool is not supported.</li>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]373</ul>
374
375</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]376
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]377<!-- ======================================================================= -->
378<div class="doc_subsection">
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]379 <a name="x86-be">Known problems with the X86 back-end</a>
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]380</div>
381
382<div class="doc_text">
383
384<ul>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]385<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]386 assembly that uses the X86 floating point stack</a>.</li>
Chris Lattner725a0d82007-09-26 06:01:35 +0000[diff] [blame]387<li>The X86 backend occasionally has <a href="http://llvm.org/PR1649">alignment
388 problems</a> on operating systems that don't require 16-byte stack alignment
389 (including most non-darwin OS's like linux).</li>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]390</ul>
391
392</div>
393
394<!-- ======================================================================= -->
395<div class="doc_subsection">
396 <a name="ppc-be">Known problems with the PowerPC back-end</a>
397</div>
398
399<div class="doc_text">
400
401<ul>
Nicolas Geoffraye4285dc2007-05-15 09:21:28 +0000[diff] [blame]402<li>The Linux PPC32/ABI support needs testing for the interpreter and static
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]403compilation, and lacks support for debug information.</li>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]404</ul>
405
406</div>
407
408<!-- ======================================================================= -->
409<div class="doc_subsection">
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]410 <a name="arm-be">Known problems with the ARM back-end</a>
411</div>
412
413<div class="doc_text">
414
415<ul>
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]416<li>Thumb mode works only on ARMv6 or higher processors. On sub-ARMv6
Duncan Sandsc90d68b2007-09-26 15:59:54 +0000[diff] [blame]417processors, thumb programs can crash or produce wrong
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]418results (<a href="http://llvm.org/PR1388">PR1388</a>).</li>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]419<li>Compilation for ARM Linux OABI (old ABI) is supported, but not fully tested.
420</li>
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]421<li>There is a bug in QEMU-ARM (<= 0.9.0) which causes it to incorrectly execute
422programs compiled with LLVM. Please use more recent versions of QEMU.</li>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]423</ul>
424
425</div>
426
427<!-- ======================================================================= -->
428<div class="doc_subsection">
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]429 <a name="sparc-be">Known problems with the SPARC back-end</a>
430</div>
431
432<div class="doc_text">
433
434<ul>
435<li>The SPARC backend only supports the 32-bit SPARC ABI (-m32), it does not
436 support the 64-bit SPARC ABI (-m64).</li>
437</ul>
438
439</div>
440
441<!-- ======================================================================= -->
442<div class="doc_subsection">
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]443 <a name="alpha-be">Known problems with the Alpha back-end</a>
444</div>
445
446<div class="doc_text">
447
448<ul>
449
450<li>On 21164s, some rare FP arithmetic sequences which may trap do not have the
451appropriate nops inserted to ensure restartability.</li>
452
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]453</ul>
454</div>
455
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]456<!-- ======================================================================= -->
457<div class="doc_subsection">
458 <a name="ia64-be">Known problems with the IA64 back-end</a>
459</div>
460
461<div class="doc_text">
462
463<ul>
464
465<li>C++ programs are likely to fail on IA64, as calls to <tt>setjmp</tt> are
466made where the argument is not 16-byte aligned, as required on IA64. (Strictly
467speaking this is not a bug in the IA64 back-end; it will also be encountered
468when building C++ programs using the C back-end.)</li>
469
470<li>The C++ front-end does not use <a href="http://llvm.org/PR406">IA64
471ABI compliant layout of v-tables</a>. In particular, it just stores function
472pointers instead of function descriptors in the vtable. This bug prevents
473mixing C++ code compiled with LLVM with C++ objects compiled by other C++
474compilers.</li>
475
476<li>There are a few ABI violations which will lead to problems when mixing LLVM
477output with code built with other compilers, particularly for floating-point
478programs.</li>
479
480<li>Defining vararg functions is not supported (but calling them is ok).</li>
481
Chris Lattnercaf06342007-05-09 04:58:11 +0000[diff] [blame]482<li>The Itanium backend has bitrotted somewhat.</li>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]483</ul>
484
485</div>
486
487<!-- ======================================================================= -->
488<div class="doc_subsection">
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]489 <a name="c-be">Known problems with the C back-end</a>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]490</div>
491
492<div class="doc_text">
493
494<ul>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]495<li><a href="http://llvm.org/PR802">The C backend does not support inline
496 assembly code</a>.</li>
Chris Lattner725a0d82007-09-26 06:01:35 +0000[diff] [blame]497<li><a href="http://llvm.org/PR1126">The C backend does not support vectors
498 yet</a>.</li>
Chris Lattner725a0d82007-09-26 06:01:35 +0000[diff] [blame]499<li><a href="http://llvm.org/PR1658">The C backend violates the ABI of common
500 C++ programs</a>, preventing intermixing between C++ compiled by the CBE and
501 C++ code compiled with LLC or native compilers.</li>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]502</ul>
503
504</div>
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]505
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]506
507<!-- ======================================================================= -->
508<div class="doc_subsection">
509 <a name="c-fe">Known problems with the C front-end</a>
510</div>
Chris Lattner47588f92003-10-02 05:07:23 +0000[diff] [blame]511
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]512<!-- _______________________________________________________________________ -->
Chris Lattnerb40efb32003-12-14 05:03:43 +0000[diff] [blame]513<div class="doc_subsubsection">Bugs</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]514
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]515<div class="doc_text">
Chris Lattnerc5d658a2006-03-03 00:34:26 +0000[diff] [blame]516
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]517<p>llvm-gcc does not currently support <a href="http://llvm.org/PR869">Link-Time
518Optimization</a> on most platforms "out-of-the-box". Please inquire on the
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]519llvmdev mailing list if you are interested.</p>
Chris Lattnerd9ea0172006-08-08 17:27:28 +0000[diff] [blame]520
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]521</div>
522
523<!-- _______________________________________________________________________ -->
524<div class="doc_subsubsection">
525 Notes
526</div>
527
528<div class="doc_text">
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]529<ul>
530
Chris Lattnerd09c4ec2007-05-17 22:02:24 +0000[diff] [blame]531<li><p>llvm-gcc does <b>not</b> support <tt>__builtin_apply</tt> yet.
532 See <a href="http://gcc.gnu.org/onlinedocs/gcc/Constructing-Calls.html#Constructing%20Calls">Constructing Calls</a>: Dispatching a call to another function.</p>
533</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]534
Duncan Sands32a83442007-05-18 09:04:20 +0000[diff] [blame]535<li><p>llvm-gcc <b>partially</b> supports these GCC extensions:</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]536 <ol>
Duncan Sandsc90d68b2007-09-26 15:59:54 +0000[diff] [blame]537 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Nested-Functions.html#Nested%20Functions">Nested Functions</a>:
538
539 As in Algol and Pascal, lexical scoping of functions.
540 Nested functions are supported, but llvm-gcc does not support
Duncan Sands0869f4a2007-09-26 16:24:52 +0000[diff] [blame]541 taking the address of a nested function (except on the X86-32 target)
Duncan Sandsc90d68b2007-09-26 15:59:54 +0000[diff] [blame]542 or non-local gotos.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]543
544 <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]545
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]546 Declaring that functions have no side effects or that they can never
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]547 return.<br>
548
Anton Korobeynikovbe6fe282007-11-16 11:12:01 +0000[diff] [blame]549 <b>Supported:</b> <tt>alias</tt>, <tt>always_inline</tt>, <tt>cdecl</tt>,
550 <tt>const</tt>, <tt>constructor</tt>, <tt>destructor</tt>,
Anton Korobeynikov9413de32006-11-18 08:04:48 +0000[diff] [blame]551 <tt>deprecated</tt>, <tt>fastcall</tt>, <tt>format</tt>,
Anton Korobeynikovbe6fe282007-11-16 11:12:01 +0000[diff] [blame]552 <tt>format_arg</tt>, <tt>non_null</tt>, <tt>noinline</tt>,
553 <tt>noreturn</tt>, <tt>pure</tt>, <tt>regparm</tt>
Anton Korobeynikov8cea37b2007-01-23 12:35:46 +0000[diff] [blame]554 <tt>section</tt>, <tt>stdcall</tt>, <tt>unused</tt>, <tt>used</tt>,
555 <tt>visibility</tt>, <tt>warn_unused_result</tt>, <tt>weak</tt><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]556
Anton Korobeynikovbe6fe282007-11-16 11:12:01 +0000[diff] [blame]557 <b>Ignored:</b> <tt>nothrow</tt>, <tt>malloc</tt>,
558 <tt>no_instrument_function</tt></li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]559 </ol>
Chris Lattnerd09c4ec2007-05-17 22:02:24 +0000[diff] [blame]560</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]561
Chris Lattnerd09c4ec2007-05-17 22:02:24 +0000[diff] [blame]562<li><p>llvm-gcc supports the vast majority of GCC extensions, including:</p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]563
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]564 <ol>
Chris Lattnerd09c4ec2007-05-17 22:02:24 +0000[diff] [blame]565 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Pragmas.html#Pragmas">Pragmas</a>: Pragmas accepted by GCC.</li>
566 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Local-Labels.html#Local%20Labels">Local Labels</a>: Labels local to a block.</li>
567 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html#Other%20Builtins">Other Builtins</a>:
568 Other built-in functions.</li>
569 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Attributes.html#Variable%20Attributes">Variable Attributes</a>:
570 Specifying attributes of variables.</li>
571 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Type-Attributes.html#Type%20Attributes">Type Attributes</a>: Specifying attributes of types.</li>
572 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Thread_002dLocal.html">Thread-Local</a>: Per-thread variables.</li>
573 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Length.html#Variable%20Length">Variable Length</a>:
574 Arrays whose length is computed at run time.</li>
Chris Lattner7fe97dd2004-03-16 08:54:07 +0000[diff] [blame]575 <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]576 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html#Statement%20Exprs">Statement Exprs</a>: Putting statements and declarations inside expressions.</li>
577 <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]578 <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]579 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Conditionals.html#Conditionals">Conditionals</a>: Omitting the middle operand of a <code>?:</code> expression.</li>
580 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Long-Long.html#Long%20Long">Long Long</a>: Double-word integers.</li>
581 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Complex.html#Complex">Complex</a>: Data types for complex numbers.</li>
582 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Hex-Floats.html#Hex%20Floats">Hex Floats</a>:Hexadecimal floating-point constants.</li>
583 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html#Zero%20Length">Zero Length</a>: Zero-length arrays.</li>
584 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Empty-Structures.html#Empty%20Structures">Empty Structures</a>: Structures with no members.</li>
585 <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>
586 <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]587 <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>
588 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Constraints.html#Constraints">Constraints</a>: Constraints for asm operands.</li>
589 <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>
590 <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>
591 <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>
592 <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]593 <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]594 <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]595 <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]596 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Compound-Literals.html#Compound%20Literals">Compound Literals</a>: Compound literals give structures, unions,
597or arrays as values.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]598 <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]599 <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]600 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Case-Ranges.html#Case%20Ranges">Case Ranges</a>: `case 1 ... 9' and such.</li>
601 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Mixed-Declarations.html#Mixed%20Declarations">Mixed Declarations</a>: Mixing declarations and code.</li>
602 <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]603 <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]604 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Dollar-Signs.html#Dollar%20Signs">Dollar Signs</a>: Dollar sign is allowed in identifiers.</li>
605 <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>
606 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Alignment.html#Alignment">Alignment</a>: Inquiring about the alignment of a type or variable.</li>
607 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Inline.html#Inline">Inline</a>: Defining inline functions (as fast as macros).</li>
608 <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>
609 <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>
610 <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]611 <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]612 <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>
613 <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]614 </ol></li>
615
616</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]617
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]618<p>If you run into GCC extensions which have not been included in any of these
619lists, please let us know (also including whether or not they work).</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]620
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]621</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]622
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]623<!-- ======================================================================= -->
624<div class="doc_subsection">
625 <a name="c++-fe">Known problems with the C++ front-end</a>
626</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]627
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]628<div class="doc_text">
629
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]630<p>The C++ front-end is considered to be fully
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame]631tested and works for a number of non-trivial programs, including LLVM
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]632itself, Qt, Mozilla, etc.</p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]633
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]634<ul>
Chris Lattner000c73b2008-02-06 06:30:34 +0000[diff] [blame]635<li>Exception handling only works well on the X86 and PowerPC targets.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]636</ul>
Chris Lattnerfcc54b32003-10-07 22:14:37 +0000[diff] [blame]637
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]638</div>
639
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]640
Chris Lattner98a493c2005-05-15 16:01:20 +0000[diff] [blame]641
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]642<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]643<div class="doc_section">
644 <a name="additionalinfo">Additional Information</a>
645</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]646<!-- *********************************************************************** -->
647
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]648<div class="doc_text">
649
Chris Lattner416db102005-05-16 17:13:10 +0000[diff] [blame]650<p>A wide variety of additional information is available on the <a
Chris Lattnerb4b0ce72007-05-18 00:44:29 +0000[diff] [blame]651href="http://llvm.org">LLVM web page</a>, in particular in the <a
652href="http://llvm.org/docs/">documentation</a> section. The web page also
Reid Spencer669ed452007-07-09 08:04:31 +0000[diff] [blame]653contains versions of the API documentation which is up-to-date with the
654Subversion version of the source code.
Misha Brukman109d9e82005-03-30 19:14:24 +0000[diff] [blame]655You can access versions of these documents specific to this release by going
656into the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]657
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]658<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]659us via the <a href="http://llvm.org/docs/#maillist"> mailing
Chris Lattner5eccca42003-12-12 21:22:16 +0000[diff] [blame]660lists</a>.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]661
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]662</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]663
664<!-- *********************************************************************** -->
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]665
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]666<hr>
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]667<address>
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672
Chris Lattnerb4b0ce72007-05-18 00:44:29 +0000[diff] [blame]673 <a href="http://llvm.org/">LLVM Compiler Infrastructure</a><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]674 Last modified: $Date$
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]675</address>
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Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]677</body>
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