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gerrit-public.fairphone.software / fp2-dev / platform / external / llvm / aef8c64777a7d3b4aef1661305659d8ff5133dc9 / . / docs / ReleaseNotes.html
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4<head>
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Chris Lattnerc30c5c72005-11-08 21:29:17 +0000[diff] [blame]7 <title>LLVM 1.7cvs 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 Lattnerc30c5c72005-11-08 21:29:17 +0000[diff] [blame]11<div class="doc_title">LLVM 1.7 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
26<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]27<div class="doc_section">
28 <a name="intro">Introduction</a>
29</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]30<!-- *********************************************************************** -->
31
Misha Brukman500bc302003-11-22 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 Lattnerc30c5c72005-11-08 21:29:17 +0000[diff] [blame]35infrastructure, release 1.7. Here we describe the status of LLVM, including any
Chris Lattner8a458762005-05-15 05:44:51 +0000[diff] [blame]36known problems and major improvements from the previous release. The most
37up-to-date version of this document can be found on the <a
Chris Lattnerc30c5c72005-11-08 21:29:17 +0000[diff] [blame]38href="http://llvm.org/releases/">LLVM releases web site</a>. If you are
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]39not reading this on the LLVM web pages, you should probably go there because
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]40this document may be updated after the release.</p>
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]41
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame]42<p>For more information about LLVM, including information about the latest
Chris Lattnerc463b272005-10-29 07:07:09 +0000[diff] [blame]43release, please check out the <a href="http://llvm.org/">main LLVM
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]44web site</a>. If you have questions or comments, the <a
45href="http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVM developer's mailing
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]46list</a> is a good place to send them.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]47
Chris Lattner78bf32b2004-12-09 22:22:58 +0000[diff] [blame]48<p>Note that if you are reading this file from CVS or the main LLVM web page,
49this document applies to the <i>next</i> release, not the current one. To see
50the release notes for the current or previous releases, see the <a
Chris Lattnerc463b272005-10-29 07:07:09 +0000[diff] [blame]51href="http://llvm.org/releases/">releases page</a>.</p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]52
53</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]54
55<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]56<div class="doc_section">
57 <a name="whatsnew">What's New?</a>
58</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]59<!-- *********************************************************************** -->
60
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]61<div class="doc_text">
62
Chris Lattnerc463b272005-10-29 07:07:09 +0000[diff] [blame]63<p>This is the seventh public release of the LLVM Compiler Infrastructure. This
64release incorporates a large number of enhancements and additions (primarily in
65the code generator), which combine to improve the quality of the code generated
66by LLVM by up to 30% in some cases. This release is also the first release to
Chris Lattnerf2548362005-11-03 22:33:48 +0000[diff] [blame]67have first-class support for Mac OS X: all of the major bugs have been shaken
Chris Lattnerc463b272005-10-29 07:07:09 +0000[diff] [blame]68out and it is now as well supported as Linux on X86.</p>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]69
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]70</div>
71
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]72<!--=========================================================================-->
Chris Lattner8a458762005-05-15 05:44:51 +0000[diff] [blame]73<div class="doc_subsection">
Chris Lattnerc30c5c72005-11-08 21:29:17 +0000[diff] [blame]74<a name="newfeatures">New Features in LLVM 1.7cvs</a>
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]75</div>
Brian Gaeke6b31beb2004-01-16 21:55:04 +0000[diff] [blame]76
John Criswelle531ec52005-06-29 16:22:34 +0000[diff] [blame]77
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]78<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]79<div class="doc_section">
80 <a name="portability">Portability and Supported Platforms</a>
81</div>
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]82<!-- *********************************************************************** -->
83
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]84<div class="doc_text">
85
John Criswell0b5b5e92004-12-08 20:35:47 +0000[diff] [blame]86<p>LLVM is known to work on the following platforms:</p>
Chris Lattner4654bdb2004-06-01 18:22:41 +0000[diff] [blame]87
88<ul>
Reid Spencer00812e22005-05-17 02:47:27 +0000[diff] [blame]89 <li>Intel and AMD machines running Red Hat Linux, Fedora Core and FreeBSD
90 (and probably other unix-like systems).</li>
Chris Lattner4654bdb2004-06-01 18:22:41 +0000[diff] [blame]91<li>Sun UltraSPARC workstations running Solaris 8.</li>
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame]92<li>Intel and AMD machines running on Win32 with the Cygwin libraries (limited
93 support is available for native builds with Visual C++).</li>
Chris Lattnerfeaf9602005-10-29 05:14:01 +0000[diff] [blame]94<li>PowerPC and X86-based Mac OS X systems, running 10.2 and above.</li>
John Criswell9321fa82005-05-13 20:28:15 +0000[diff] [blame]95<li>Alpha-based machines running Debian GNU/Linux.</li>
96<li>Itanium-based machines running Linux and HP-UX.</li>
Chris Lattner4654bdb2004-06-01 18:22:41 +0000[diff] [blame]97</ul>
98
Brian Gaekeb0fd7612004-05-09 05:28:35 +0000[diff] [blame]99<p>The core LLVM infrastructure uses
100<a href="http://www.gnu.org/software/autoconf/">GNU autoconf</a> to adapt itself
101to the machine and operating system on which it is built. However, minor
102porting may be required to get LLVM to work on new platforms. We welcome your
103portability patches and reports of successful builds or error messages.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]104
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]105</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]106
107<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]108<div class="doc_section">
109 <a name="knownproblems">Known Problems</a>
110</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]111<!-- *********************************************************************** -->
112
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]113<div class="doc_text">
114
115<p>This section contains all known problems with the LLVM system, listed by
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]116component. As new problems are discovered, they will be added to these
Chris Lattner5eccca42003-12-12 21:22:16 +0000[diff] [blame]117sections. If you run into a problem, please check the <a
Chris Lattnerc463b272005-10-29 07:07:09 +0000[diff] [blame]118href="http://llvm.org/bugs/">LLVM bug database</a> and submit a bug if
Chris Lattner5eccca42003-12-12 21:22:16 +0000[diff] [blame]119there isn't already one.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]120
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]121</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]122
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]123<!-- ======================================================================= -->
124<div class="doc_subsection">
125 <a name="experimental">Experimental features included with this release</a>
126</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]127
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]128<div class="doc_text">
129
Misha Brukman6df9e2c2004-05-12 21:46:05 +0000[diff] [blame]130<p>The following components of this LLVM release are either untested, known to
131be broken or unreliable, or are in early development. These components should
132not be relied on, and bugs should not be filed against them, but they may be
133useful to some people. In particular, if you would like to work on one of these
134components, please contact us on the llvmdev list.</p>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]135
136<ul>
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame]137<li>The following passes are incomplete or buggy, and may be removed in future
Chris Lattnere9412172005-10-24 02:33:44 +0000[diff] [blame]138 releases: <tt>-cee, -pre</tt></li>
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame]139<li>The <tt>llvm-db</tt> tool is in a very early stage of development, but can
140 be used to step through programs and inspect the stack.</li>
Chris Lattnereaf0f2b2005-10-24 16:36:36 +0000[diff] [blame]141<li>The SparcV8 and IA64 code generators are experimental.</li>
Chris Lattnerc463b272005-10-29 07:07:09 +0000[diff] [blame]142<li>The Alpha JIT is experimental.</li>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]143</ul>
144
145</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]146
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]147<!-- ======================================================================= -->
148<div class="doc_subsection">
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]149 <a name="build">Known problems with the Build System</a>
150</div>
151
152<div class="doc_text">
153
154<ul>
155 <li>The <a href="http://llvm.org/PR656">configure script sometimes fails on Solaris/Sparc</a>. A work around is documented in <a href="http://llvm.org/PR656">PR656.</a></li>
156</ul>
157</div>
158
159
160<!-- ======================================================================= -->
161<div class="doc_subsection">
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]162 <a name="core">Known problems with the LLVM Core</a>
163</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]164
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]165<div class="doc_text">
166
167<ul>
Misha Brukman109d9e82005-03-30 19:14:24 +0000[diff] [blame]168 <li>In the JIT, <tt>dlsym()</tt> on a symbol compiled by the JIT will not
169 work.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]170</ul>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]171</div>
172
173<!-- ======================================================================= -->
174<div class="doc_subsection">
175 <a name="c-fe">Known problems with the C front-end</a>
176</div>
Chris Lattner47588f92003-10-02 05:07:23 +0000[diff] [blame]177
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]178<!-- _______________________________________________________________________ -->
Chris Lattnerb40efb32003-12-14 05:03:43 +0000[diff] [blame]179<div class="doc_subsubsection">Bugs</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]180
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]181<div class="doc_text">
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]182<ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]183<li>C99 Variable sized arrays do not release stack memory when they go out of
184 scope. Thus, the following program may run out of stack space:
185<pre>
186 for (i = 0; i != 1000000; ++i) {
187 int X[n];
188 foo(X);
189 }
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]190</pre></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]191
Misha Brukman6df9e2c2004-05-12 21:46:05 +0000[diff] [blame]192<li>Initialization of global union variables can only be done <a
Chris Lattnerc463b272005-10-29 07:07:09 +0000[diff] [blame]193href="http://llvm.org/PR162">with the largest union member</a>.</li>
Chris Lattnerf580cdc2004-03-16 21:39:04 +0000[diff] [blame]194
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]195</ul>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]196</div>
197
198<!-- _______________________________________________________________________ -->
199<div class="doc_subsubsection">
200 Notes
201</div>
202
203<div class="doc_text">
204
205<ul>
206
207<li>Inline assembly is not yet supported.</li>
Chris Lattnere01fcfb2003-10-27 18:30:37 +0000[diff] [blame]208
209<li>"long double" is transformed by the front-end into "double". There is no
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]210support for floating point data types of any size other than 32 and 64
211bits.</li>
212
213<li>The following Unix system functionality has not been tested and may not
214work:
Misha Brukmane0c891c2003-11-22 01:00:11 +0000[diff] [blame]215 <ol>
216 <li><tt>sigsetjmp</tt>, <tt>siglongjmp</tt> - These are not turned into the
217 appropriate <tt>invoke</tt>/<tt>unwind</tt> instructions. Note that
218 <tt>setjmp</tt> and <tt>longjmp</tt> <em>are</em> compiled correctly.
219 <li><tt>getcontext</tt>, <tt>setcontext</tt>, <tt>makecontext</tt>
220 - These functions have not been tested.
221 </ol></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]222
223<li>Although many GCC extensions are supported, some are not. In particular,
224 the following extensions are known to <b>not be</b> supported:
225 <ol>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]226 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Local-Labels.html#Local%20Labels">Local Labels</a>: Labels local to a block.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]227 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Nested-Functions.html#Nested%20Functions">Nested Functions</a>: As in Algol and Pascal, lexical scoping of functions.</li>
228 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Constructing-Calls.html#Constructing%20Calls">Constructing Calls</a>: Dispatching a call to another function.</li>
229 <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>
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]230 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Constraints.html#Constraints">Constraints</a>: Constraints for asm operands.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]231 <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>
232 <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>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]233 <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>
234 <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>
Tanya Lattner014e5f52004-12-08 18:25:34 +0000[diff] [blame]235 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Thread_002dLocal.html">Thread-Local</a>: Per-thread variables.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]236 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Pragmas.html#Pragmas">Pragmas</a>: Pragmas accepted by GCC.</li>
Misha Brukmane0c891c2003-11-22 01:00:11 +0000[diff] [blame]237 </ol>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]238
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]239 <p>The following GCC extensions are <b>partially</b> supported. An ignored
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]240 attribute means that the LLVM compiler ignores the presence of the attribute,
241 but the code should still work. An unsupported attribute is one which is
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]242 ignored by the LLVM compiler and will cause a different interpretation of
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]243 the program.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]244
245 <ol>
246 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Length.html#Variable%20Length">Variable Length</a>:
247 Arrays whose length is computed at run time.<br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]248 Supported, but allocated stack space is not freed until the function returns (noted above).</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]249
250 <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]251
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]252 Declaring that functions have no side effects or that they can never
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]253 return.<br>
254
255 <b>Supported:</b> <tt>format</tt>, <tt>format_arg</tt>, <tt>non_null</tt>,
John Criswell0b5b5e92004-12-08 20:35:47 +0000[diff] [blame]256 <tt>noreturn</tt>, <tt>constructor</tt>, <tt>destructor</tt>,
Chris Lattneraef8c642005-12-05 05:23:06 +0000[diff] [blame^]257 <tt>unused</tt>, <tt>used</tt>,
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]258 <tt>deprecated</tt>, <tt>warn_unused_result</tt>, <tt>weak</tt><br>
259
John Criswell0b5b5e92004-12-08 20:35:47 +0000[diff] [blame]260 <b>Ignored:</b> <tt>noinline</tt>,
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]261 <tt>always_inline</tt>, <tt>pure</tt>, <tt>const</tt>, <tt>nothrow</tt>,
262 <tt>malloc</tt>, <tt>no_instrument_function</tt>, <tt>cdecl</tt><br>
263
Chris Lattneraef8c642005-12-05 05:23:06 +0000[diff] [blame^]264 <b>Unsupported:</b> <tt>section</tt>, <tt>alias</tt>,
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]265 <tt>visibility</tt>, <tt>regparm</tt>, <tt>stdcall</tt>,
266 <tt>fastcall</tt>, all other target specific attributes</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]267
268 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Attributes.html#Variable%20Attributes">Variable Attributes</a>:
269 Specifying attributes of variables.<br>
270 <b>Supported:</b> <tt>cleanup</tt>, <tt>common</tt>, <tt>nocommon</tt>,
271 <tt>deprecated</tt>, <tt>transparent_union</tt>,
Chris Lattneraef8c642005-12-05 05:23:06 +0000[diff] [blame^]272 <tt>unused</tt>, <tt>used</tt>, <tt>weak</tt><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]273
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]274 <b>Unsupported:</b> <tt>aligned</tt>, <tt>mode</tt>, <tt>packed</tt>,
275 <tt>section</tt>, <tt>shared</tt>, <tt>tls_model</tt>,
276 <tt>vector_size</tt>, <tt>dllimport</tt>,
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]277 <tt>dllexport</tt>, all target specific attributes.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]278
Misha Brukmanc4b7bee2003-12-12 04:37:31 +0000[diff] [blame]279 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Type-Attributes.html#Type%20Attributes">Type Attributes</a>: Specifying attributes of types.<br>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]280 <b>Supported:</b> <tt>transparent_union</tt>, <tt>unused</tt>,
Misha Brukmanc4b7bee2003-12-12 04:37:31 +0000[diff] [blame]281 <tt>deprecated</tt>, <tt>may_alias</tt><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]282
283 <b>Unsupported:</b> <tt>aligned</tt>, <tt>packed</tt>,
284 all target specific attributes.</li>
285
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]286 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html#Other%20Builtins">Other Builtins</a>:
287 Other built-in functions.<br>
288 We support all builtins which have a C language equivalent (e.g.,
289 <tt>__builtin_cos</tt>), <tt>__builtin_alloca</tt>,
290 <tt>__builtin_types_compatible_p</tt>, <tt>__builtin_choose_expr</tt>,
Chris Lattnerceebeb62004-06-18 06:26:29 +0000[diff] [blame]291 <tt>__builtin_constant_p</tt>, and <tt>__builtin_expect</tt>
292 (currently ignored). We also support builtins for ISO C99 floating
Chris Lattner7939b782005-05-07 02:21:21 +0000[diff] [blame]293 point comparison macros (e.g., <tt>__builtin_islessequal</tt>),
294 <tt>__builtin_prefetch</tt>, <tt>__builtin_popcount[ll]</tt>,
295 <tt>__builtin_clz[ll]</tt>, and <tt>__builtin_ctz[ll]</tt>.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]296 </ol>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]297
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]298 <p>The following extensions <b>are</b> known to be supported:</p>
299
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]300 <ol>
Chris Lattner7fe97dd2004-03-16 08:54:07 +0000[diff] [blame]301 <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]302 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html#Statement%20Exprs">Statement Exprs</a>: Putting statements and declarations inside expressions.</li>
303 <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]304 <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]305 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Conditionals.html#Conditionals">Conditionals</a>: Omitting the middle operand of a <code>?:</code> expression.</li>
306 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Long-Long.html#Long%20Long">Long Long</a>: Double-word integers.</li>
307 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Complex.html#Complex">Complex</a>: Data types for complex numbers.</li>
308 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Hex-Floats.html#Hex%20Floats">Hex Floats</a>:Hexadecimal floating-point constants.</li>
309 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html#Zero%20Length">Zero Length</a>: Zero-length arrays.</li>
310 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Empty-Structures.html#Empty%20Structures">Empty Structures</a>: Structures with no members.</li>
311 <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>
312 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Escaped-Newlines.html#Escaped%20Newlines">Escaped Newlines</a>: Slightly looser rules for escaped newlines.</li>
313 <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]314 <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]315 <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]316 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Compound-Literals.html#Compound%20Literals">Compound Literals</a>: Compound literals give structures, unions,
317or arrays as values.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]318 <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]319 <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]320 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Case-Ranges.html#Case%20Ranges">Case Ranges</a>: `case 1 ... 9' and such.</li>
321 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Mixed-Declarations.html#Mixed%20Declarations">Mixed Declarations</a>: Mixing declarations and code.</li>
322 <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]323 <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]324 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Dollar-Signs.html#Dollar%20Signs">Dollar Signs</a>: Dollar sign is allowed in identifiers.</li>
325 <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>
326 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Alignment.html#Alignment">Alignment</a>: Inquiring about the alignment of a type or variable.</li>
327 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Inline.html#Inline">Inline</a>: Defining inline functions (as fast as macros).</li>
328 <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>
329 <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>
330 <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]331 <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]332 <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>
333 <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]334 </ol></li>
335
336</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]337
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]338<p>If you run into GCC extensions which have not been included in any of these
339lists, please let us know (also including whether or not they work).</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]340
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]341</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]342
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]343<!-- ======================================================================= -->
344<div class="doc_subsection">
345 <a name="c++-fe">Known problems with the C++ front-end</a>
346</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]347
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]348<div class="doc_text">
349
Reid Spencere09ca642004-12-07 08:39:08 +0000[diff] [blame]350<p>For this release, the C++ front-end is considered to be fully
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame]351tested and works for a number of non-trivial programs, including LLVM
352itself.</p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]353
354</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]355
356<!-- _______________________________________________________________________ -->
Chris Lattner3a51be12004-02-14 04:12:41 +0000[diff] [blame]357<div class="doc_subsubsection">Bugs</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]358
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]359<div class="doc_text">
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]360
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]361<ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]362<li>The C++ front-end inherits all problems afflicting the <a href="#c-fe">C
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]363 front-end</a>.</li>
Chris Lattner7962f712004-07-17 02:04:41 +0000[diff] [blame]364
Chris Lattnerd5713882004-08-02 20:28:44 +0000[diff] [blame]365</ul>
366
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]367</div>
368
369<!-- _______________________________________________________________________ -->
370<div class="doc_subsubsection">
371 Notes
372</div>
373
374<div class="doc_text">
375
376<ul>
Chris Lattnere01fcfb2003-10-27 18:30:37 +0000[diff] [blame]377
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]378<li>The C++ front-end is based on a pre-release of the GCC 3.4 C++ parser. This
379parser is significantly more standards compliant (and picky) than prior GCC
380versions. For more information, see the C++ section of the <a
Chris Lattner9e848092003-12-12 04:25:33 +0000[diff] [blame]381href="http://gcc.gnu.org/gcc-3.4/changes.html">GCC 3.4 release notes</a>.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]382
383<li>Destructors for local objects are not always run when a <tt>longjmp</tt> is
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]384 performed. In particular, destructors for objects in the <tt>longjmp</tt>ing
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]385 function and in the <tt>setjmp</tt> receiver function may not be run.
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]386 Objects in intervening stack frames will be destroyed, however (which is
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]387 better than most compilers).</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]388
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]389<li>The LLVM C++ front-end follows the <a
390 href="http://www.codesourcery.com/cxx-abi">Itanium C++ ABI</a>.
391 This document, which is not Itanium specific, specifies a standard for name
392 mangling, class layout, v-table layout, RTTI formats, and other C++
393 representation issues. Because we use this API, code generated by the LLVM
394 compilers should be binary compatible with machine code generated by other
395 Itanium ABI C++ compilers (such as G++, the Intel and HP compilers, etc).
396 <i>However</i>, the exception handling mechanism used by LLVM is very
397 different from the model used in the Itanium ABI, so <b>exceptions will not
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]398 interact correctly</b>. </li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]399
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]400</ul>
Chris Lattnerfcc54b32003-10-07 22:14:37 +0000[diff] [blame]401
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]402</div>
403
404<!-- ======================================================================= -->
405<div class="doc_subsection">
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]406 <a name="c-be">Known problems with the C back-end</a>
407</div>
408
409<div class="doc_text">
410
411<ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]412
413<li>The C back-end produces code that violates the ANSI C Type-Based Alias
414Analysis rules. As such, special options may be necessary to compile the code
415(for example, GCC requires the <tt>-fno-strict-aliasing</tt> option). This
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]416problem probably cannot be fixed.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]417
Chris Lattnerc463b272005-10-29 07:07:09 +0000[diff] [blame]418<li><a href="http://llvm.org/PR56">Zero arg vararg functions are not
Chris Lattner2af46052003-10-24 04:03:19 +0000[diff] [blame]419supported</a>. This should not affect LLVM produced by the C or C++
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]420frontends.</li>
Chris Lattner2af46052003-10-24 04:03:19 +0000[diff] [blame]421
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]422</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]423
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]424</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]425
Andrew Lenharth30a1f8f2005-05-03 16:59:09 +0000[diff] [blame]426<!-- ======================================================================= -->
427<div class="doc_subsection">
Chris Lattnerf9b1f462005-05-16 17:06:29 +0000[diff] [blame]428 <a name="x86-be">Known problems with the X86 back-end</a>
429</div>
430
431<div class="doc_text">
432
433<ul>
Chris Lattnerc463b272005-10-29 07:07:09 +0000[diff] [blame]434<li><a href="http://llvm.org/PR566">Memory Mapped I/O Intrinsics do not fence
435memory</a></li>
Chris Lattnerf9b1f462005-05-16 17:06:29 +0000[diff] [blame]436</ul>
437
438</div>
439
440<!-- ======================================================================= -->
441<div class="doc_subsection">
442 <a name="ppc-be">Known problems with the PowerPC back-end</a>
443</div>
444
445<div class="doc_text">
446
447<ul>
448<li>None yet</li>
449</ul>
450
451</div>
452
453<!-- ======================================================================= -->
454<div class="doc_subsection">
455 <a name="sparcv9-be">Known problems with the SparcV9 back-end</a>
456</div>
457
458<div class="doc_text">
459
460<ul>
Chris Lattnerc463b272005-10-29 07:07:09 +0000[diff] [blame]461<li><a href="http://llvm.org/PR60">[sparcv9] SparcV9 backend miscompiles
Chris Lattnerf9b1f462005-05-16 17:06:29 +0000[diff] [blame]462several programs in the LLVM test suite</a></li>
463</ul>
464
465</div>
466
467<!-- ======================================================================= -->
468<div class="doc_subsection">
Andrew Lenharth30a1f8f2005-05-03 16:59:09 +0000[diff] [blame]469 <a name="alpha-be">Known problems with the Alpha back-end</a>
470</div>
471
472<div class="doc_text">
473
474<ul>
475
Chris Lattnerf9b1f462005-05-16 17:06:29 +0000[diff] [blame]476<li>On 21164s, some rare FP arithmetic sequences which may trap do not have the
477appropriate nops inserted to ensure restartability.</li>
Andrew Lenharth30a1f8f2005-05-03 16:59:09 +0000[diff] [blame]478
Andrew Lenharth30a1f8f2005-05-03 16:59:09 +0000[diff] [blame]479</ul>
480
481</div>
482
Duraid Madina2e36d6e2005-05-14 05:48:13 +0000[diff] [blame]483<!-- ======================================================================= -->
484<div class="doc_subsection">
485 <a name="ia64-be">Known problems with the IA64 back-end</a>
486</div>
487
488<div class="doc_text">
489
490<ul>
491
492<li>C++ programs are likely to fail on IA64, as calls to <tt>setjmp</tt> are
493made where the argument is not 16-byte aligned, as required on IA64. (Strictly
494speaking this is not a bug in the IA64 back-end; it will also be encountered
495when building C++ programs using the C back-end.)</li>
496
Chris Lattnerc463b272005-10-29 07:07:09 +0000[diff] [blame]497<li>The C++ front-end does not use <a href="http://llvm.org/PR406">IA64
Chris Lattnerf9b1f462005-05-16 17:06:29 +0000[diff] [blame]498ABI compliant layout of v-tables</a>. In particular, it just stores function
499pointers instead of function descriptors in the vtable. This bug prevents
500mixing C++ code compiled with LLVM with C++ objects compiled by other C++
501compilers.</li>
Duraid Madina2e36d6e2005-05-14 05:48:13 +0000[diff] [blame]502
Chris Lattnerf9b1f462005-05-16 17:06:29 +0000[diff] [blame]503<li>There are a few ABI violations which will lead to problems when mixing LLVM
504output with code built with other compilers, particularly for floating-point
505programs.</li>
506
507<li>Defining vararg functions is not supported (but calling them is ok).</li>
Duraid Madina2e36d6e2005-05-14 05:48:13 +0000[diff] [blame]508
509</ul>
510
511</div>
512
Chris Lattner98a493c2005-05-15 16:01:20 +0000[diff] [blame]513<!-- ======================================================================= -->
514<div class="doc_subsection">
515 <a name="sparcv8">Known problems with the SPARC-V8 back-end</a>
516</div>
517
518<div class="doc_text">
519
520<ul>
521<li>Many features are still missing (e.g. support for 64-bit integer
Chris Lattnerfeaf9602005-10-29 05:14:01 +0000[diff] [blame]522arithmetic). This back-end is in pre-beta state.</li>
Chris Lattner98a493c2005-05-15 16:01:20 +0000[diff] [blame]523</ul>
Chris Lattner98a493c2005-05-15 16:01:20 +0000[diff] [blame]524</div>
525
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]526<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]527<div class="doc_section">
528 <a name="additionalinfo">Additional Information</a>
529</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]530<!-- *********************************************************************** -->
531
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]532<div class="doc_text">
533
Chris Lattner416db102005-05-16 17:13:10 +0000[diff] [blame]534<p>A wide variety of additional information is available on the <a
Chris Lattnerc463b272005-10-29 07:07:09 +0000[diff] [blame]535href="http://llvm.org">LLVM web page</a>, including <a
536href="http://llvm.org/docs/">documentation</a> and <a
537href="http://llvm.org/pubs/">publications describing algorithms and
Misha Brukman109d9e82005-03-30 19:14:24 +0000[diff] [blame]538components implemented in LLVM</a>. The web page also contains versions of the
539API documentation which is up-to-date with the CVS version of the source code.
540You can access versions of these documents specific to this release by going
541into the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]542
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]543<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]544us via the <a href="http://llvm.org/docs/#maillist"> mailing
Chris Lattner5eccca42003-12-12 21:22:16 +0000[diff] [blame]545lists</a>.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]546
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]547</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]548
549<!-- *********************************************************************** -->
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]550
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]551<hr>
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]552<address>
Misha Brukman38847d52003-12-21 22:53:21 +0000[diff] [blame]553 <a href="http://jigsaw.w3.org/css-validator/check/referer"><img
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]554 src="http://jigsaw.w3.org/css-validator/images/vcss" alt="Valid CSS!"></a>
555 <a href="http://validator.w3.org/check/referer"><img
556 src="http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01!" /></a>
557
Chris Lattnerc463b272005-10-29 07:07:09 +0000[diff] [blame]558 <a href="http://llvm.org/">The LLVM Compiler Infrastructure</a><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]559 Last modified: $Date$
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]560</address>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]561
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]562</body>
563</html>