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gerrit-public.fairphone.software / toolchain / llvm-project / 2b8a52e2592797ad2f748bbfdd14c4c22f216cc6 / . / llvm / docs / ReleaseNotes.html
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4<head>
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Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]6 <link rel="stylesheet" href="llvm.css" type="text/css">
Chris Lattner7422bce2008-02-06 06:30:34 +0000[diff] [blame]7 <title>LLVM 2.2 Release Notes</title>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]8</head>
9<body>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]10
Chris Lattner7422bce2008-02-06 06:30:34 +0000[diff] [blame]11<div class="doc_title">LLVM 2.2 Release Notes</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]12
13<ol>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]14 <li><a href="#intro">Introduction</a></li>
15 <li><a href="#whatsnew">What's New?</a></li>
Chris Lattner77a51732004-04-30 22:17:12 +0000[diff] [blame]16 <li><a href="GettingStarted.html">Installation Instructions</a></li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]17 <li><a href="#portability">Portability and Supported Platforms</a></li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]18 <li><a href="#knownproblems">Known Problems</a>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]19 <li><a href="#additionalinfo">Additional Information</a></li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]20</ol>
21
Chris Lattner020e1fc2004-05-23 21:07:27 +0000[diff] [blame]22<div class="doc_author">
Chris Lattnera69595e2005-10-29 07:07:09 +0000[diff] [blame]23 <p>Written by the <a href="http://llvm.org">LLVM Team</a><p>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]24</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]25
Chris Lattner0ec35042008-02-06 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 Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]29<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]30<div class="doc_section">
31 <a name="intro">Introduction</a>
32</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]33<!-- *********************************************************************** -->
34
Misha Brukman80731b92003-11-22 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 Lattner7422bce2008-02-06 06:30:34 +0000[diff] [blame]38infrastructure, release 2.2. Here we describe the status of LLVM, including
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]39major improvements from the previous release and any known problems. All LLVM
Chris Lattner98a33492007-05-09 04:58:11 +0000[diff] [blame]40releases may be downloaded from the <a href="http://llvm.org/releases/">LLVM
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]41releases web site</a>.</p>
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]42
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]43<p>For more information about LLVM, including information about the latest
Chris Lattnera69595e2005-10-29 07:07:09 +0000[diff] [blame]44release, please check out the <a href="http://llvm.org/">main LLVM
Chris Lattnere7525b52003-10-07 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 Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]47list</a> is a good place to send them.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]48
Reid Spencerc7f87f22007-07-09 08:04:31 +0000[diff] [blame]49<p>Note that if you are reading this file from a Subversion checkout or the
Chris Lattner0a1fd102007-09-21 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 Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]53
54</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]55
56<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]57<div class="doc_section">
58 <a name="whatsnew">What's New?</a>
59</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]60<!-- *********************************************************************** -->
61
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]62<div class="doc_text">
63
Chris Lattner7422bce2008-02-06 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 Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]66
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]67</div>
68
Chris Lattner2b8a52e2008-02-10 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 Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]76<!--=========================================================================-->
Chris Lattner406bddf2005-05-15 05:44:51 +0000[diff] [blame]77<div class="doc_subsection">
Chris Lattnera2735862008-02-10 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 Lattner7422bce2008-02-06 06:30:34 +0000[diff] [blame]93<a name="frontends">llvm-gcc 4.0, llvm-gcc 4.2, and clang</a>
Chris Lattner9f871732006-04-18 06:18:36 +0000[diff] [blame]94</div>
95
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]96<div class="doc_text">
Chris Lattner727c3742007-05-18 06:33:02 +0000[diff] [blame]97
Chris Lattner7422bce2008-02-06 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 Lattner2b8a52e2008-02-10 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 Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]106
Chris Lattnercdc44ed2008-02-06 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 Lattner2b8a52e2008-02-10 07:46:44 +0000[diff] [blame^]114this project, please see its <a href="http://clang.llvm.org/">web site</a>.</p>
Chris Lattnercdc44ed2008-02-06 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 Lattner2b8a52e2008-02-10 07:46:44 +0000[diff] [blame^]125<p>LLVM 2.2 includes several major new capabilities:</p>
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]126
127<ul>
Chris Lattner2b8a52e2008-02-10 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 Lattner6ee68ca2007-05-16 23:25:46 +0000[diff] [blame]130
Chris Lattner2b8a52e2008-02-10 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 Lattnercdc44ed2008-02-06 18:00:06 +0000[diff] [blame]136
Chris Lattner2b8a52e2008-02-10 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 Lattner20ed4ef552008-02-09 22:58:07 +0000[diff] [blame]140
Chris Lattner2b8a52e2008-02-10 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 Lattner20ed4ef552008-02-09 22:58:07 +0000[diff] [blame]145
Chris Lattner2b8a52e2008-02-10 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 Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]149
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]150</div>
151
Chris Lattner0a1fd102007-09-21 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 Lattner2b8a52e2008-02-10 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 Lattner4734a352007-09-26 05:44:21 +0000[diff] [blame]162
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]163<ul>
164
Chris Lattner2b8a52e2008-02-10 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 Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]169
Chris Lattner2b8a52e2008-02-10 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 Lattnercdc44ed2008-02-06 18:00:06 +0000[diff] [blame]173
Chris Lattner2b8a52e2008-02-10 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 Lattner47ce2b22008-02-06 18:32:06 +0000[diff] [blame]177
Chris Lattner2b8a52e2008-02-10 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 Lattner20ed4ef552008-02-09 22:58:07 +0000[diff] [blame]229<li>Evan enhanced LSR to support induction variable reuse when the induction
Chris Lattner2b8a52e2008-02-10 07:46:44 +0000[diff] [blame^]230variables have different widths.</li>
Chris Lattner20ed4ef552008-02-09 22:58:07 +0000[diff] [blame]231
Chris Lattner0a1fd102007-09-21 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 Lattner727c3742007-05-18 06:33:02 +0000[diff] [blame]241
Chris Lattner89e761c2006-04-18 06:32:08 +0000[diff] [blame]242<div class="doc_text">
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]243<p>New features include:
244</p>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]245
246<ul>
Chris Lattnercdc44ed2008-02-06 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 Lattner47ce2b22008-02-06 18:32:06 +0000[diff] [blame]249<li>Bruno: MIPS PIC support.</li>
250<li>Arnold Schwaighofer: X86 tail call support.</li>
Chris Lattner20ed4ef552008-02-09 22:58:07 +0000[diff] [blame]251<li>Dale darwin/x86-64 and darwin/ppc eh</li>
Chris Lattner2b8a52e2008-02-10 07:46:44 +0000[diff] [blame^]252<li>Evan: darwin/x86 debug info, improvements at -O0?</li>
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]253</ul>
254
255</div>
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]256
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]257<!--=========================================================================-->
258<div class="doc_subsection">
259<a name="coreimprovements">LLVM Core Improvements</a>
260</div>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]261
Chris Lattner0b7fd712006-04-19 04:02:47 +0000[diff] [blame]262<div class="doc_text">
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]263<p>New features include:
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]264</p>
265
266<ul>
Chris Lattner47ce2b22008-02-06 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 Lattner20ed4ef552008-02-09 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 Lattnera2735862008-02-10 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 Lattner2b8a52e2008-02-10 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 Lattner8ce1ba42007-05-17 21:41:31 +0000[diff] [blame]285</ul>
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]286
Chris Lattner8ce1ba42007-05-17 21:41:31 +0000[diff] [blame]287</div>
Chris Lattner72a269f2006-03-03 00:34:26 +0000[diff] [blame]288
Chris Lattner0a1fd102007-09-21 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 Lattner20ed4ef552008-02-09 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 Lattnera2735862008-02-10 07:04:35 +0000[diff] [blame]301<li>Dale GCC testsuite</li>
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]302</ul>
303
304</div>
Chris Lattner72a269f2006-03-03 00:34:26 +0000[diff] [blame]305
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]306<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]307<div class="doc_section">
308 <a name="portability">Portability and Supported Platforms</a>
309</div>
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]310<!-- *********************************************************************** -->
311
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]312<div class="doc_text">
313
John Criswell64307722004-12-08 20:35:47 +0000[diff] [blame]314<p>LLVM is known to work on the following platforms:</p>
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]315
316<ul>
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]317<li>Intel and AMD machines running Red Hat Linux, Fedora Core and FreeBSD
Reid Spencer9803b402005-05-17 02:47:27 +0000[diff] [blame]318 (and probably other unix-like systems).</li>
Chris Lattner7422bce2008-02-06 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 Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]320 64-bit modes.</li>
Chris Lattnercdc44ed2008-02-06 18:00:06 +0000[diff] [blame]321<li>Intel and AMD machines running on Win32 using MinGW libraries (native).</li>
Chris Lattnerbee7b322007-05-23 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 Criswelld5234922005-05-13 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 Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]327</ul>
328
Brian Gaekee3e557e2004-05-09 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 Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]334
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]335</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]336
337<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]338<div class="doc_section">
339 <a name="knownproblems">Known Problems</a>
340</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]341<!-- *********************************************************************** -->
342
Misha Brukman80731b92003-11-22 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 Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]346component. As new problems are discovered, they will be added to these
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]347sections. If you run into a problem, please check the <a
Chris Lattnera69595e2005-10-29 07:07:09 +0000[diff] [blame]348href="http://llvm.org/bugs/">LLVM bug database</a> and submit a bug if
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]349there isn't already one.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]350
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]351</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]352
Chris Lattnerb911de42004-03-14 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 Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]357
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]358<div class="doc_text">
359
Misha Brukmanfa50a222004-05-12 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 Lattner05a225b2006-08-09 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 Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]365
366<ul>
Chris Lattnercdc44ed2008-02-06 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 Lattner7422bce2008-02-06 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 Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]373</ul>
374
375</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]376
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]377<!-- ======================================================================= -->
378<div class="doc_subsection">
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]379 <a name="x86-be">Known problems with the X86 back-end</a>
John Criswell3bdbd302005-11-08 21:11:33 +0000[diff] [blame]380</div>
381
382<div class="doc_text">
383
384<ul>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]385<li>The X86 backend does not yet support <a href="http://llvm.org/PR879">inline
Chris Lattner98a33492007-05-09 04:58:11 +0000[diff] [blame]386 assembly that uses the X86 floating point stack</a>.</li>
Chris Lattner8e061162007-09-26 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 Lattnerb81f10e2006-11-18 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 Geoffray77d99502007-05-15 09:21:28 +0000[diff] [blame]402<li>The Linux PPC32/ABI support needs testing for the interpreter and static
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]403compilation, and lacks support for debug information.</li>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]404</ul>
405
406</div>
407
408<!-- ======================================================================= -->
409<div class="doc_subsection">
Chris Lattner97beb512007-05-14 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 Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]416<li>Thumb mode works only on ARMv6 or higher processors. On sub-ARMv6
Duncan Sands47fc0a22007-09-26 15:59:54 +0000[diff] [blame]417processors, thumb programs can crash or produce wrong
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]418results (<a href="http://llvm.org/PR1388">PR1388</a>).</li>
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]419<li>Compilation for ARM Linux OABI (old ABI) is supported, but not fully tested.
420</li>
Chris Lattnerbee7b322007-05-23 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 Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]423</ul>
424
425</div>
426
427<!-- ======================================================================= -->
428<div class="doc_subsection">
Chris Lattnerb81f10e2006-11-18 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 Lattnerb81f10e2006-11-18 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 Criswell3bdbd302005-11-08 21:11:33 +0000[diff] [blame]453</ul>
454</div>
455
Chris Lattnerb81f10e2006-11-18 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 Lattner98a33492007-05-09 04:58:11 +0000[diff] [blame]482<li>The Itanium backend has bitrotted somewhat.</li>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]483</ul>
484
485</div>
486
487<!-- ======================================================================= -->
488<div class="doc_subsection">
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]489 <a name="c-be">Known problems with the C back-end</a>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]490</div>
491
492<div class="doc_text">
493
494<ul>
Chris Lattner97beb512007-05-14 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 Lattner8e061162007-09-26 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 Lattner8e061162007-09-26 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 Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]502</ul>
503
504</div>
John Criswell3bdbd302005-11-08 21:11:33 +0000[diff] [blame]505
Misha Brukman80731b92003-11-22 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 Lattner178f3db2003-10-02 05:07:23 +0000[diff] [blame]511
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]512<!-- _______________________________________________________________________ -->
Chris Lattner5a8a7282003-12-14 05:03:43 +0000[diff] [blame]513<div class="doc_subsubsection">Bugs</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]514
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]515<div class="doc_text">
Chris Lattner72a269f2006-03-03 00:34:26 +0000[diff] [blame]516
Chris Lattnercdc44ed2008-02-06 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 Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]519llvmdev mailing list if you are interested.</p>
Chris Lattner44124232006-08-08 17:27:28 +0000[diff] [blame]520
Misha Brukman80731b92003-11-22 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 Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]529<ul>
530
Chris Lattner2f131fe2007-05-17 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 Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]534
Duncan Sandsea7a3262007-05-18 09:04:20 +0000[diff] [blame]535<li><p>llvm-gcc <b>partially</b> supports these GCC extensions:</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]536 <ol>
Duncan Sands47fc0a22007-09-26 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 Sands755d9302007-09-26 16:24:52 +0000[diff] [blame]541 taking the address of a nested function (except on the X86-32 target)
Duncan Sands47fc0a22007-09-26 15:59:54 +0000[diff] [blame]542 or non-local gotos.</li>
Chris Lattner3d482502003-10-02 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 Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]545
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]546 Declaring that functions have no side effects or that they can never
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]547 return.<br>
548
Anton Korobeynikovb8a47242007-11-16 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 Korobeynikove7cbbfc2006-11-18 08:04:48 +0000[diff] [blame]551 <tt>deprecated</tt>, <tt>fastcall</tt>, <tt>format</tt>,
Anton Korobeynikovb8a47242007-11-16 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 Korobeynikovc7f9f3d2007-01-23 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 Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]556
Anton Korobeynikovb8a47242007-11-16 11:12:01 +0000[diff] [blame]557 <b>Ignored:</b> <tt>nothrow</tt>, <tt>malloc</tt>,
558 <tt>no_instrument_function</tt></li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]559 </ol>
Chris Lattner2f131fe2007-05-17 22:02:24 +0000[diff] [blame]560</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]561
Chris Lattner2f131fe2007-05-17 22:02:24 +0000[diff] [blame]562<li><p>llvm-gcc supports the vast majority of GCC extensions, including:</p>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]563
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]564 <ol>
Chris Lattner2f131fe2007-05-17 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 Lattnerd3dc8502004-03-16 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 Brukman80731b92003-11-22 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 Lattnerce33a1b2004-06-22 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 Brukman80731b92003-11-22 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 Lattnerb81f10e2006-11-18 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 Brukman80731b92003-11-22 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 Brukman8395d732003-12-12 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 Brukman80731b92003-11-22 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 Criswell86a3a482003-12-18 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 Brukman80731b92003-11-22 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 Brukman8395d732003-12-12 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 Brukman80731b92003-11-22 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 Lattner7591b822004-12-08 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 Brukman80731b92003-11-22 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 Lattner3646dad2004-02-14 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 Brukman80731b92003-11-22 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 Brukman7cb4e382003-11-22 01:00:11 +0000[diff] [blame]614 </ol></li>
615
616</ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]617
Misha Brukman80731b92003-11-22 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 Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]620
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]621</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]622
Misha Brukman80731b92003-11-22 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 Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]627
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]628<div class="doc_text">
629
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]630<p>The C++ front-end is considered to be fully
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]631tested and works for a number of non-trivial programs, including LLVM
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]632itself, Qt, Mozilla, etc.</p>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]633
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]634<ul>
Chris Lattner7422bce2008-02-06 06:30:34 +0000[diff] [blame]635<li>Exception handling only works well on the X86 and PowerPC targets.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]636</ul>
Chris Lattner46ecf612003-10-07 22:14:37 +0000[diff] [blame]637
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]638</div>
639
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]640
Chris Lattnerb62a5f02005-05-15 16:01:20 +0000[diff] [blame]641
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]642<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]643<div class="doc_section">
644 <a name="additionalinfo">Additional Information</a>
645</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]646<!-- *********************************************************************** -->
647
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]648<div class="doc_text">
649
Chris Lattnercb5596d2005-05-16 17:13:10 +0000[diff] [blame]650<p>A wide variety of additional information is available on the <a
Chris Lattnere0c1df42007-05-18 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 Spencerc7f87f22007-07-09 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 Brukman96158092005-03-30 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 Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]657
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]658<p>If you have any questions or comments about LLVM, please feel free to contact
Chris Lattnera69595e2005-10-29 07:07:09 +0000[diff] [blame]659us via the <a href="http://llvm.org/docs/#maillist"> mailing
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]660lists</a>.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]661
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]662</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]663
664<!-- *********************************************************************** -->
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]665
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]666<hr>
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]667<address>
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672
Chris Lattnere0c1df42007-05-18 00:44:29 +0000[diff] [blame]673 <a href="http://llvm.org/">LLVM Compiler Infrastructure</a><br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]674 Last modified: $Date$
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]675</address>
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Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]677</body>
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