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gerrit-public.fairphone.software / toolchain / llvm-project / cdc44ed525e30fed40ca23678787211fd7c2bba0 / . / llvm / docs / ReleaseNotes.html
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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
26<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]27<div class="doc_section">
28 <a name="intro">Introduction</a>
29</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]30<!-- *********************************************************************** -->
31
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]32<div class="doc_text">
33
34<p>This document contains the release notes for the LLVM compiler
Chris Lattner7422bce2008-02-06 06:30:34 +0000[diff] [blame]35infrastructure, release 2.2. Here we describe the status of LLVM, including
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]36major improvements from the previous release and any known problems. All LLVM
Chris Lattner98a33492007-05-09 04:58:11 +0000[diff] [blame]37releases may be downloaded from the <a href="http://llvm.org/releases/">LLVM
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]38releases web site</a>.</p>
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]39
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]40<p>For more information about LLVM, including information about the latest
Chris Lattnera69595e2005-10-29 07:07:09 +0000[diff] [blame]41release, please check out the <a href="http://llvm.org/">main LLVM
Chris Lattnere7525b52003-10-07 21:38:31 +0000[diff] [blame]42web site</a>. If you have questions or comments, the <a
43href="http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVM developer's mailing
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]44list</a> is a good place to send them.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]45
Reid Spencerc7f87f22007-07-09 08:04:31 +0000[diff] [blame]46<p>Note that if you are reading this file from a Subversion checkout or the
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]47main LLVM web page, this document applies to the <i>next</i> release, not the
48current one. To see the release notes for a specific releases, please see the
49<a href="http://llvm.org/releases/">releases page</a>.</p>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]50
51</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]52
53<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]54<div class="doc_section">
55 <a name="whatsnew">What's New?</a>
56</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]57<!-- *********************************************************************** -->
58
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]59<div class="doc_text">
60
Chris Lattner7422bce2008-02-06 06:30:34 +0000[diff] [blame]61<p>This is the thirteenth public release of the LLVM Compiler Infrastructure.
62It includes many features and refinements from LLVM 2.1.</p>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]63
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]64</div>
65
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]66<!--=========================================================================-->
Chris Lattner406bddf2005-05-15 05:44:51 +0000[diff] [blame]67<div class="doc_subsection">
Chris Lattner7422bce2008-02-06 06:30:34 +0000[diff] [blame]68<a name="frontends">llvm-gcc 4.0, llvm-gcc 4.2, and clang</a>
Chris Lattner9f871732006-04-18 06:18:36 +0000[diff] [blame]69</div>
70
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]71<div class="doc_text">
Chris Lattner727c3742007-05-18 06:33:02 +0000[diff] [blame]72
Chris Lattner7422bce2008-02-06 06:30:34 +0000[diff] [blame]73<p>LLVM 2.2 fully supports both the llvm-gcc 4.0 and llvm-gcc 4.2 front-ends (in
74LLVM 2.1, llvm-gcc 4.2 was beta). Since LLVM 2.1, the llvm-gcc 4.2 front-end
75has made leaps and bounds and is now at least as good as 4.0 in virtually every
76area, and is better in several areas (for example, exception handling
77correctness). We strongly recommend that you migrate from llvm-gcc 4.0 to
78llvm-gcc 4.2 in this release cycle because <b>LLVM 2.2 is the last release
79that will support llvm-gcc 4.0</b>: LLVM 2.3 will only support the llvm-gcc
804.2 front-end.</p>
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]81
Chris Lattnercdc44ed2008-02-06 18:00:06 +0000[diff] [blame^]82<p>The <a href="http://clang.llvm.org/">clang project</a> is an effort to build
83a set of new 'llvm native' front-end technologies for the LLVM optimizer
84and code generator. Currently, its C and Objective-C support is maturing
85nicely, and it has advanced source-to-source analysis and transformation
86capabilities. If you are interested in building source-level tools for C and
87Objective-C (and eventually C++), you should take a look. However, note that
88clang is not an official part of the LLVM 2.2 release. If you are interested in
89this project, please see the web site.</p>
90
91</div>
92
93<!--=========================================================================-->
94<div class="doc_subsection">
95<a name="majorfeatures">Major New Features</a>
96</div>
97
98<div class="doc_text">
99
100<p>Dale contributed full support for long double on x86/x86-64 (where it is 80
101bits) and on Darwin PPC/PPC64 (where it is 128 bits).</p>
102
103<p>Ada, gfortran</p>
104
105<p>
106debug improvements -O0
107EH.
108
109Gordon: GC Revamp. docs/GarbageCollection.html
110
111Kaleidescope: docs/tutorial
112
113Gordon: C and Ocaml Bindings
Chris Lattner727c3742007-05-18 06:33:02 +0000[diff] [blame]114
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]115</div>
116
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]117<!--=========================================================================-->
118<div class="doc_subsection">
119<a name="optimizer">Optimizer Improvements</a>
120</div>
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]121
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]122<div class="doc_text">
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]123
Chris Lattner4734a352007-09-26 05:44:21 +0000[diff] [blame]124<p>Some of the most noticable feature improvements this release have been in the
125optimizer, speeding it up and making it more aggressive. For example:</p>
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]126
127<ul>
Tanya Lattner6ee68ca2007-05-16 23:25:46 +0000[diff] [blame]128
Chris Lattnercdc44ed2008-02-06 18:00:06 +0000[diff] [blame^]129<li>Daniel Berlin and (?) rewrote Andersen's alias analysis (which is not
130enabled by default) to be several orders of magnitude faster, implmented Offline
131Variable Substitution.</li>
Tanya Lattner6ee68ca2007-05-16 23:25:46 +0000[diff] [blame]132
Chris Lattnercdc44ed2008-02-06 18:00:06 +0000[diff] [blame^]133
134Devang: LoopIndexSplit is enabled by default.
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]135</ul>
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]136
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]137</div>
138
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]139<!--=========================================================================-->
140<div class="doc_subsection">
141<a name="codegen">Code Generator Improvements</a>
142</div>
143
144<div class="doc_text">
145
Chris Lattnercdc44ed2008-02-06 18:00:06 +0000[diff] [blame^]146<p>foci of this release was performance tuning and bug
Chris Lattner4734a352007-09-26 05:44:21 +0000[diff] [blame]147 fixing. In addition to these, several new major changes occurred:</p>
148
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]149<ul>
150
Chris Lattnercdc44ed2008-02-06 18:00:06 +0000[diff] [blame^]151<li>Owen contributed Machine Loop info, domintors, etc.</li>
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]152
Chris Lattnercdc44ed2008-02-06 18:00:06 +0000[diff] [blame^]153<li>Dan added support for emitting debug information with .file and .loc on
154targets that support it</li>
155
156<li>Evan physical register dependencies in the BURR scheduler</li>
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]157</ul>
158
159</div>
160
161
162<!--=========================================================================-->
163<div class="doc_subsection">
164<a name="targetspecific">Target Specific Improvements</a>
165</div>
Chris Lattner727c3742007-05-18 06:33:02 +0000[diff] [blame]166
Chris Lattner89e761c2006-04-18 06:32:08 +0000[diff] [blame]167<div class="doc_text">
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]168<p>New features include:
169</p>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]170
171<ul>
Chris Lattnercdc44ed2008-02-06 18:00:06 +0000[diff] [blame^]172<li>Evan X86 now models EFLAGS in instructions.</li>
173<li>Evan: If conversion on by default for ARM.</li>
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]174</ul>
175
176</div>
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]177
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]178
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]179<!--=========================================================================-->
180<div class="doc_subsection">
181<a name="llvmgccimprovements">llvm-gcc Improvements</a>
182</div>
Tanya Lattner6ee68ca2007-05-16 23:25:46 +0000[diff] [blame]183
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]184<div class="doc_text">
185<p>New features include:
186</p>
Tanya Lattner6ee68ca2007-05-16 23:25:46 +0000[diff] [blame]187
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]188<ul>
Chris Lattner7422bce2008-02-06 06:30:34 +0000[diff] [blame]189<li>.</li>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]190</ul>
191
Chris Lattner89e761c2006-04-18 06:32:08 +0000[diff] [blame]192</div>
193
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]194
195<!--=========================================================================-->
196<div class="doc_subsection">
197<a name="coreimprovements">LLVM Core Improvements</a>
198</div>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]199
Chris Lattner0b7fd712006-04-19 04:02:47 +0000[diff] [blame]200<div class="doc_text">
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]201<p>New features include:
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]202</p>
203
204<ul>
Chris Lattner7422bce2008-02-06 06:30:34 +0000[diff] [blame]205<li>.</li>
Chris Lattner8ce1ba42007-05-17 21:41:31 +0000[diff] [blame]206</ul>
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]207
Chris Lattner8ce1ba42007-05-17 21:41:31 +0000[diff] [blame]208</div>
Chris Lattner72a269f2006-03-03 00:34:26 +0000[diff] [blame]209
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]210<!--=========================================================================-->
211<div class="doc_subsection">
212<a name="otherimprovements">Other Improvements</a>
213</div>
214
215<div class="doc_text">
216<p>New features include:
217</p>
218
219<ul>
Chris Lattner7422bce2008-02-06 06:30:34 +0000[diff] [blame]220<li>.</li>
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]221</ul>
222
223</div>
Chris Lattner72a269f2006-03-03 00:34:26 +0000[diff] [blame]224
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]225<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]226<div class="doc_section">
227 <a name="portability">Portability and Supported Platforms</a>
228</div>
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]229<!-- *********************************************************************** -->
230
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]231<div class="doc_text">
232
John Criswell64307722004-12-08 20:35:47 +0000[diff] [blame]233<p>LLVM is known to work on the following platforms:</p>
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]234
235<ul>
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]236<li>Intel and AMD machines running Red Hat Linux, Fedora Core and FreeBSD
Reid Spencer9803b402005-05-17 02:47:27 +0000[diff] [blame]237 (and probably other unix-like systems).</li>
Chris Lattner7422bce2008-02-06 06:30:34 +0000[diff] [blame]238<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]239 64-bit modes.</li>
Chris Lattnercdc44ed2008-02-06 18:00:06 +0000[diff] [blame^]240<li>Intel and AMD machines running on Win32 using MinGW libraries (native).</li>
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]241<li>Intel and AMD machines running on Win32 with the Cygwin libraries (limited
242 support is available for native builds with Visual C++).</li>
243<li>Sun UltraSPARC workstations running Solaris 8.</li>
John Criswelld5234922005-05-13 20:28:15 +0000[diff] [blame]244<li>Alpha-based machines running Debian GNU/Linux.</li>
245<li>Itanium-based machines running Linux and HP-UX.</li>
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]246</ul>
247
Brian Gaekee3e557e2004-05-09 05:28:35 +0000[diff] [blame]248<p>The core LLVM infrastructure uses
249<a href="http://www.gnu.org/software/autoconf/">GNU autoconf</a> to adapt itself
250to the machine and operating system on which it is built. However, minor
251porting may be required to get LLVM to work on new platforms. We welcome your
252portability patches and reports of successful builds or error messages.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]253
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]254</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]255
256<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]257<div class="doc_section">
258 <a name="knownproblems">Known Problems</a>
259</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]260<!-- *********************************************************************** -->
261
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]262<div class="doc_text">
263
264<p>This section contains all known problems with the LLVM system, listed by
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]265component. As new problems are discovered, they will be added to these
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]266sections. If you run into a problem, please check the <a
Chris Lattnera69595e2005-10-29 07:07:09 +0000[diff] [blame]267href="http://llvm.org/bugs/">LLVM bug database</a> and submit a bug if
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]268there isn't already one.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]269
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]270</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]271
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]272<!-- ======================================================================= -->
273<div class="doc_subsection">
274 <a name="experimental">Experimental features included with this release</a>
275</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]276
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]277<div class="doc_text">
278
Misha Brukmanfa50a222004-05-12 21:46:05 +0000[diff] [blame]279<p>The following components of this LLVM release are either untested, known to
280be broken or unreliable, or are in early development. These components should
281not be relied on, and bugs should not be filed against them, but they may be
282useful 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]283components, 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]284
285<ul>
Chris Lattnercdc44ed2008-02-06 18:00:06 +0000[diff] [blame^]286<li>The <tt>-cee</tt> pass is known to be buggy and will be removed in
287 LLVM 2.3.</li>
Chris Lattner7422bce2008-02-06 06:30:34 +0000[diff] [blame]288<li>The MSIL, IA64, Alpha, and MIPS backends are experimental.</li>
289<li>The LLC "<tt>-filetype=asm</tt>" (the default) is the only supported
290 value for this option.</li>
291<li>The llvmc tool is not supported.</li>
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]292</ul>
293
294</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]295
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]296<!-- ======================================================================= -->
297<div class="doc_subsection">
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]298 <a name="x86-be">Known problems with the X86 back-end</a>
John Criswell3bdbd302005-11-08 21:11:33 +0000[diff] [blame]299</div>
300
301<div class="doc_text">
302
303<ul>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]304<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]305 assembly that uses the X86 floating point stack</a>.</li>
Chris Lattner8e061162007-09-26 06:01:35 +0000[diff] [blame]306<li>The X86 backend occasionally has <a href="http://llvm.org/PR1649">alignment
307 problems</a> on operating systems that don't require 16-byte stack alignment
308 (including most non-darwin OS's like linux).</li>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]309</ul>
310
311</div>
312
313<!-- ======================================================================= -->
314<div class="doc_subsection">
315 <a name="ppc-be">Known problems with the PowerPC back-end</a>
316</div>
317
318<div class="doc_text">
319
320<ul>
Nicolas Geoffray77d99502007-05-15 09:21:28 +0000[diff] [blame]321<li>The Linux PPC32/ABI support needs testing for the interpreter and static
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]322compilation, and lacks support for debug information.</li>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]323</ul>
324
325</div>
326
327<!-- ======================================================================= -->
328<div class="doc_subsection">
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]329 <a name="arm-be">Known problems with the ARM back-end</a>
330</div>
331
332<div class="doc_text">
333
334<ul>
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]335<li>Thumb mode works only on ARMv6 or higher processors. On sub-ARMv6
Duncan Sands47fc0a22007-09-26 15:59:54 +0000[diff] [blame]336processors, thumb programs can crash or produce wrong
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]337results (<a href="http://llvm.org/PR1388">PR1388</a>).</li>
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]338<li>Compilation for ARM Linux OABI (old ABI) is supported, but not fully tested.
339</li>
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]340<li>There is a bug in QEMU-ARM (<= 0.9.0) which causes it to incorrectly execute
341programs compiled with LLVM. Please use more recent versions of QEMU.</li>
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]342</ul>
343
344</div>
345
346<!-- ======================================================================= -->
347<div class="doc_subsection">
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]348 <a name="sparc-be">Known problems with the SPARC back-end</a>
349</div>
350
351<div class="doc_text">
352
353<ul>
354<li>The SPARC backend only supports the 32-bit SPARC ABI (-m32), it does not
355 support the 64-bit SPARC ABI (-m64).</li>
356</ul>
357
358</div>
359
360<!-- ======================================================================= -->
361<div class="doc_subsection">
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]362 <a name="alpha-be">Known problems with the Alpha back-end</a>
363</div>
364
365<div class="doc_text">
366
367<ul>
368
369<li>On 21164s, some rare FP arithmetic sequences which may trap do not have the
370appropriate nops inserted to ensure restartability.</li>
371
John Criswell3bdbd302005-11-08 21:11:33 +0000[diff] [blame]372</ul>
373</div>
374
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]375<!-- ======================================================================= -->
376<div class="doc_subsection">
377 <a name="ia64-be">Known problems with the IA64 back-end</a>
378</div>
379
380<div class="doc_text">
381
382<ul>
383
384<li>C++ programs are likely to fail on IA64, as calls to <tt>setjmp</tt> are
385made where the argument is not 16-byte aligned, as required on IA64. (Strictly
386speaking this is not a bug in the IA64 back-end; it will also be encountered
387when building C++ programs using the C back-end.)</li>
388
389<li>The C++ front-end does not use <a href="http://llvm.org/PR406">IA64
390ABI compliant layout of v-tables</a>. In particular, it just stores function
391pointers instead of function descriptors in the vtable. This bug prevents
392mixing C++ code compiled with LLVM with C++ objects compiled by other C++
393compilers.</li>
394
395<li>There are a few ABI violations which will lead to problems when mixing LLVM
396output with code built with other compilers, particularly for floating-point
397programs.</li>
398
399<li>Defining vararg functions is not supported (but calling them is ok).</li>
400
Chris Lattner98a33492007-05-09 04:58:11 +0000[diff] [blame]401<li>The Itanium backend has bitrotted somewhat.</li>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]402</ul>
403
404</div>
405
406<!-- ======================================================================= -->
407<div class="doc_subsection">
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]408 <a name="c-be">Known problems with the C back-end</a>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]409</div>
410
411<div class="doc_text">
412
413<ul>
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]414<li><a href="http://llvm.org/PR802">The C backend does not support inline
415 assembly code</a>.</li>
Chris Lattner8e061162007-09-26 06:01:35 +0000[diff] [blame]416<li><a href="http://llvm.org/PR1126">The C backend does not support vectors
417 yet</a>.</li>
Chris Lattner8e061162007-09-26 06:01:35 +0000[diff] [blame]418<li><a href="http://llvm.org/PR1658">The C backend violates the ABI of common
419 C++ programs</a>, preventing intermixing between C++ compiled by the CBE and
420 C++ code compiled with LLC or native compilers.</li>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]421</ul>
422
423</div>
John Criswell3bdbd302005-11-08 21:11:33 +0000[diff] [blame]424
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]425
426<!-- ======================================================================= -->
427<div class="doc_subsection">
428 <a name="c-fe">Known problems with the C front-end</a>
429</div>
Chris Lattner178f3db2003-10-02 05:07:23 +0000[diff] [blame]430
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]431<!-- _______________________________________________________________________ -->
Chris Lattner5a8a7282003-12-14 05:03:43 +0000[diff] [blame]432<div class="doc_subsubsection">Bugs</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]433
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]434<div class="doc_text">
Chris Lattner72a269f2006-03-03 00:34:26 +0000[diff] [blame]435
Chris Lattnercdc44ed2008-02-06 18:00:06 +0000[diff] [blame^]436<p>llvm-gcc does not currently support <a href="http://llvm.org/PR869">Link-Time
437Optimization</a> on most platforms "out-of-the-box". Please inquire on the
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]438llvmdev mailing list if you are interested.</p>
Chris Lattner44124232006-08-08 17:27:28 +0000[diff] [blame]439
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]440</div>
441
442<!-- _______________________________________________________________________ -->
443<div class="doc_subsubsection">
444 Notes
445</div>
446
447<div class="doc_text">
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]448<ul>
449
Chris Lattner2f131fe2007-05-17 22:02:24 +0000[diff] [blame]450<li><p>llvm-gcc does <b>not</b> support <tt>__builtin_apply</tt> yet.
451 See <a href="http://gcc.gnu.org/onlinedocs/gcc/Constructing-Calls.html#Constructing%20Calls">Constructing Calls</a>: Dispatching a call to another function.</p>
452</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]453
Duncan Sandsea7a3262007-05-18 09:04:20 +0000[diff] [blame]454<li><p>llvm-gcc <b>partially</b> supports these GCC extensions:</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]455 <ol>
Duncan Sands47fc0a22007-09-26 15:59:54 +0000[diff] [blame]456 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Nested-Functions.html#Nested%20Functions">Nested Functions</a>:
457
458 As in Algol and Pascal, lexical scoping of functions.
459 Nested functions are supported, but llvm-gcc does not support
Duncan Sands755d9302007-09-26 16:24:52 +0000[diff] [blame]460 taking the address of a nested function (except on the X86-32 target)
Duncan Sands47fc0a22007-09-26 15:59:54 +0000[diff] [blame]461 or non-local gotos.</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]462
463 <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]464
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]465 Declaring that functions have no side effects or that they can never
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]466 return.<br>
467
Anton Korobeynikovb8a47242007-11-16 11:12:01 +0000[diff] [blame]468 <b>Supported:</b> <tt>alias</tt>, <tt>always_inline</tt>, <tt>cdecl</tt>,
469 <tt>const</tt>, <tt>constructor</tt>, <tt>destructor</tt>,
Anton Korobeynikove7cbbfc2006-11-18 08:04:48 +0000[diff] [blame]470 <tt>deprecated</tt>, <tt>fastcall</tt>, <tt>format</tt>,
Anton Korobeynikovb8a47242007-11-16 11:12:01 +0000[diff] [blame]471 <tt>format_arg</tt>, <tt>non_null</tt>, <tt>noinline</tt>,
472 <tt>noreturn</tt>, <tt>pure</tt>, <tt>regparm</tt>
Anton Korobeynikovc7f9f3d2007-01-23 12:35:46 +0000[diff] [blame]473 <tt>section</tt>, <tt>stdcall</tt>, <tt>unused</tt>, <tt>used</tt>,
474 <tt>visibility</tt>, <tt>warn_unused_result</tt>, <tt>weak</tt><br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]475
Anton Korobeynikovb8a47242007-11-16 11:12:01 +0000[diff] [blame]476 <b>Ignored:</b> <tt>nothrow</tt>, <tt>malloc</tt>,
477 <tt>no_instrument_function</tt></li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]478 </ol>
Chris Lattner2f131fe2007-05-17 22:02:24 +0000[diff] [blame]479</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]480
Chris Lattner2f131fe2007-05-17 22:02:24 +0000[diff] [blame]481<li><p>llvm-gcc supports the vast majority of GCC extensions, including:</p>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]482
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]483 <ol>
Chris Lattner2f131fe2007-05-17 22:02:24 +0000[diff] [blame]484 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Pragmas.html#Pragmas">Pragmas</a>: Pragmas accepted by GCC.</li>
485 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Local-Labels.html#Local%20Labels">Local Labels</a>: Labels local to a block.</li>
486 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html#Other%20Builtins">Other Builtins</a>:
487 Other built-in functions.</li>
488 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Attributes.html#Variable%20Attributes">Variable Attributes</a>:
489 Specifying attributes of variables.</li>
490 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Type-Attributes.html#Type%20Attributes">Type Attributes</a>: Specifying attributes of types.</li>
491 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Thread_002dLocal.html">Thread-Local</a>: Per-thread variables.</li>
492 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Length.html#Variable%20Length">Variable Length</a>:
493 Arrays whose length is computed at run time.</li>
Chris Lattnerd3dc8502004-03-16 08:54:07 +0000[diff] [blame]494 <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]495 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html#Statement%20Exprs">Statement Exprs</a>: Putting statements and declarations inside expressions.</li>
496 <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]497 <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]498 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Conditionals.html#Conditionals">Conditionals</a>: Omitting the middle operand of a <code>?:</code> expression.</li>
499 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Long-Long.html#Long%20Long">Long Long</a>: Double-word integers.</li>
500 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Complex.html#Complex">Complex</a>: Data types for complex numbers.</li>
501 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Hex-Floats.html#Hex%20Floats">Hex Floats</a>:Hexadecimal floating-point constants.</li>
502 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html#Zero%20Length">Zero Length</a>: Zero-length arrays.</li>
503 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Empty-Structures.html#Empty%20Structures">Empty Structures</a>: Structures with no members.</li>
504 <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>
505 <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]506 <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>
507 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Constraints.html#Constraints">Constraints</a>: Constraints for asm operands.</li>
508 <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>
509 <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>
510 <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>
511 <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]512 <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]513 <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]514 <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]515 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Compound-Literals.html#Compound%20Literals">Compound Literals</a>: Compound literals give structures, unions,
516or arrays as values.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]517 <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]518 <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]519 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Case-Ranges.html#Case%20Ranges">Case Ranges</a>: `case 1 ... 9' and such.</li>
520 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Mixed-Declarations.html#Mixed%20Declarations">Mixed Declarations</a>: Mixing declarations and code.</li>
521 <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]522 <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]523 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Dollar-Signs.html#Dollar%20Signs">Dollar Signs</a>: Dollar sign is allowed in identifiers.</li>
524 <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>
525 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Alignment.html#Alignment">Alignment</a>: Inquiring about the alignment of a type or variable.</li>
526 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Inline.html#Inline">Inline</a>: Defining inline functions (as fast as macros).</li>
527 <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>
528 <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>
529 <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]530 <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]531 <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>
532 <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]533 </ol></li>
534
535</ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]536
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]537<p>If you run into GCC extensions which have not been included in any of these
538lists, please let us know (also including whether or not they work).</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]539
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]540</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]541
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]542<!-- ======================================================================= -->
543<div class="doc_subsection">
544 <a name="c++-fe">Known problems with the C++ front-end</a>
545</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]546
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]547<div class="doc_text">
548
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]549<p>The C++ front-end is considered to be fully
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]550tested and works for a number of non-trivial programs, including LLVM
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]551itself, Qt, Mozilla, etc.</p>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]552
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]553<ul>
Chris Lattner7422bce2008-02-06 06:30:34 +0000[diff] [blame]554<li>Exception handling only works well on the X86 and PowerPC targets.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]555</ul>
Chris Lattner46ecf612003-10-07 22:14:37 +0000[diff] [blame]556
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]557</div>
558
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]559
Chris Lattnerb62a5f02005-05-15 16:01:20 +0000[diff] [blame]560
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]561<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]562<div class="doc_section">
563 <a name="additionalinfo">Additional Information</a>
564</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]565<!-- *********************************************************************** -->
566
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]567<div class="doc_text">
568
Chris Lattnercb5596d2005-05-16 17:13:10 +0000[diff] [blame]569<p>A wide variety of additional information is available on the <a
Chris Lattnere0c1df42007-05-18 00:44:29 +0000[diff] [blame]570href="http://llvm.org">LLVM web page</a>, in particular in the <a
571href="http://llvm.org/docs/">documentation</a> section. The web page also
Reid Spencerc7f87f22007-07-09 08:04:31 +0000[diff] [blame]572contains versions of the API documentation which is up-to-date with the
573Subversion version of the source code.
Misha Brukman96158092005-03-30 19:14:24 +0000[diff] [blame]574You can access versions of these documents specific to this release by going
575into the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]576
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]577<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]578us via the <a href="http://llvm.org/docs/#maillist"> mailing
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]579lists</a>.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]580
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]581</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]582
583<!-- *********************************************************************** -->
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]584
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]585<hr>
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]586<address>
Misha Brukman8834af92003-12-21 22:53:21 +0000[diff] [blame]587 <a href="http://jigsaw.w3.org/css-validator/check/referer"><img
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]588 src="http://jigsaw.w3.org/css-validator/images/vcss" alt="Valid CSS!"></a>
589 <a href="http://validator.w3.org/check/referer"><img
590 src="http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01!" /></a>
591
Chris Lattnere0c1df42007-05-18 00:44:29 +0000[diff] [blame]592 <a href="http://llvm.org/">LLVM Compiler Infrastructure</a><br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]593 Last modified: $Date$
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]594</address>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]595
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]596</body>
597</html>