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gerrit-public.fairphone.software / toolchain / llvm-project / 25777c8c25900e6973e8bcea333f03e5cb006402 / . / llvm / docs / ReleaseNotes.html
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Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]1<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
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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 Lattner578ab912005-11-08 21:29:17 +0000[diff] [blame]7 <title>LLVM 1.7cvs 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 Lattner578ab912005-11-08 21:29:17 +0000[diff] [blame]11<div class="doc_title">LLVM 1.7 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 Lattner578ab912005-11-08 21:29:17 +0000[diff] [blame]35infrastructure, release 1.7. Here we describe the status of LLVM, including any
Chris Lattner406bddf2005-05-15 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 Lattner578ab912005-11-08 21:29:17 +0000[diff] [blame]38href="http://llvm.org/releases/">LLVM releases web site</a>. If you are
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]39not reading this on the LLVM web pages, you should probably go there because
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]40this document may be updated after the release.</p>
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]41
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]42<p>For more information about LLVM, including information about the latest
Chris Lattnera69595e2005-10-29 07:07:09 +0000[diff] [blame]43release, please check out the <a href="http://llvm.org/">main LLVM
Chris Lattnere7525b52003-10-07 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 Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]46list</a> is a good place to send them.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]47
Chris Lattnerf3a7c242004-12-09 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 Lattnera69595e2005-10-29 07:07:09 +0000[diff] [blame]51href="http://llvm.org/releases/">releases page</a>.</p>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]52
53</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]54
55<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]56<div class="doc_section">
57 <a name="whatsnew">What's New?</a>
58</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]59<!-- *********************************************************************** -->
60
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]61<div class="doc_text">
62
Chris Lattnera69595e2005-10-29 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 Lattner5f481792005-11-03 22:33:48 +0000[diff] [blame]67have first-class support for Mac OS X: all of the major bugs have been shaken
Chris Lattnera69595e2005-10-29 07:07:09 +0000[diff] [blame]68out and it is now as well supported as Linux on X86.</p>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]69
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]70</div>
71
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]72<!--=========================================================================-->
Chris Lattner406bddf2005-05-15 05:44:51 +0000[diff] [blame]73<div class="doc_subsection">
Chris Lattner578ab912005-11-08 21:29:17 +0000[diff] [blame]74<a name="newfeatures">New Features in LLVM 1.7cvs</a>
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]75</div>
Brian Gaeke8b05e4f2004-01-16 21:55:04 +0000[diff] [blame]76
John Criswell51e2a482005-06-29 16:22:34 +0000[diff] [blame]77
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]78<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]79<div class="doc_section">
80 <a name="portability">Portability and Supported Platforms</a>
81</div>
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]82<!-- *********************************************************************** -->
83
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]84<div class="doc_text">
85
John Criswell64307722004-12-08 20:35:47 +0000[diff] [blame]86<p>LLVM is known to work on the following platforms:</p>
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]87
88<ul>
Reid Spencer9803b402005-05-17 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 Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]91<li>Sun UltraSPARC workstations running Solaris 8.</li>
Chris Lattnerb5bb5972004-12-07 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 Lattner8ad30362005-10-29 05:14:01 +0000[diff] [blame]94<li>PowerPC and X86-based Mac OS X systems, running 10.2 and above.</li>
John Criswelld5234922005-05-13 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 Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]97</ul>
98
Brian Gaekee3e557e2004-05-09 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 Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]104
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]105</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]106
107<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]108<div class="doc_section">
109 <a name="knownproblems">Known Problems</a>
110</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]111<!-- *********************************************************************** -->
112
Misha Brukman80731b92003-11-22 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 Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]116component. As new problems are discovered, they will be added to these
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]117sections. If you run into a problem, please check the <a
Chris Lattnera69595e2005-10-29 07:07:09 +0000[diff] [blame]118href="http://llvm.org/bugs/">LLVM bug database</a> and submit a bug if
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]119there isn't already one.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]120
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]121</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]122
Chris Lattnerb911de42004-03-14 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 Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]127
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]128<div class="doc_text">
129
Misha Brukmanfa50a222004-05-12 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 Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]135
136<ul>
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]137<li>The following passes are incomplete or buggy, and may be removed in future
Chris Lattner070024a2006-01-16 01:05:00 +0000[diff] [blame]138 releases: <tt>-cee</tt></li>
Chris Lattnerb5bb5972004-12-07 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 Lattner0e18bdf2005-10-24 16:36:36 +0000[diff] [blame]141<li>The SparcV8 and IA64 code generators are experimental.</li>
Chris Lattnera69595e2005-10-29 07:07:09 +0000[diff] [blame]142<li>The Alpha JIT is experimental.</li>
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]143</ul>
144
145</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]146
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]147<!-- ======================================================================= -->
148<div class="doc_subsection">
John Criswell3bdbd302005-11-08 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 Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]162 <a name="core">Known problems with the LLVM Core</a>
163</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]164
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]165<div class="doc_text">
166
167<ul>
Misha Brukman96158092005-03-30 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 Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]170</ul>
Misha Brukman80731b92003-11-22 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 Lattner178f3db2003-10-02 05:07:23 +0000[diff] [blame]177
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]178<!-- _______________________________________________________________________ -->
Chris Lattner5a8a7282003-12-14 05:03:43 +0000[diff] [blame]179<div class="doc_subsubsection">Bugs</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]180
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]181<div class="doc_text">
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]182<ul>
Chris Lattner3d482502003-10-02 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 Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]190</pre></li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]191
Misha Brukmanfa50a222004-05-12 21:46:05 +0000[diff] [blame]192<li>Initialization of global union variables can only be done <a
Chris Lattnera69595e2005-10-29 07:07:09 +0000[diff] [blame]193href="http://llvm.org/PR162">with the largest union member</a>.</li>
Chris Lattner1ab58dd2004-03-16 21:39:04 +0000[diff] [blame]194
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]195</ul>
Misha Brukman80731b92003-11-22 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 Lattnerd2a74272003-10-27 18:30:37 +0000[diff] [blame]208
209<li>"long double" is transformed by the front-end into "double". There is no
Misha Brukman80731b92003-11-22 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 Brukman7cb4e382003-11-22 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 Lattner3d482502003-10-02 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 Brukman80731b92003-11-22 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 Brukman80731b92003-11-22 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 Criswell86a3a482003-12-18 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 Brukman80731b92003-11-22 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 Brukman80731b92003-11-22 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 Lattner63371342004-12-08 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 Brukman80731b92003-11-22 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 Brukman7cb4e382003-11-22 01:00:11 +0000[diff] [blame]237 </ol>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]238
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]239 <p>The following GCC extensions are <b>partially</b> supported. An ignored
Chris Lattner3d482502003-10-02 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 Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]242 ignored by the LLVM compiler and will cause a different interpretation of
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]243 the program.</p>
Chris Lattner3d482502003-10-02 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 Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]248 Supported, but allocated stack space is not freed until the function returns (noted above).</li>
Chris Lattner3d482502003-10-02 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 Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]251
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]252 Declaring that functions have no side effects or that they can never
Misha Brukman80731b92003-11-22 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 Criswell64307722004-12-08 20:35:47 +0000[diff] [blame]256 <tt>noreturn</tt>, <tt>constructor</tt>, <tt>destructor</tt>,
Chris Lattnerca18d192005-12-05 05:23:06 +0000[diff] [blame]257 <tt>unused</tt>, <tt>used</tt>,
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]258 <tt>deprecated</tt>, <tt>warn_unused_result</tt>, <tt>weak</tt><br>
259
John Criswell64307722004-12-08 20:35:47 +0000[diff] [blame]260 <b>Ignored:</b> <tt>noinline</tt>,
Misha Brukman80731b92003-11-22 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 Lattnerca18d192005-12-05 05:23:06 +0000[diff] [blame]264 <b>Unsupported:</b> <tt>section</tt>, <tt>alias</tt>,
Misha Brukman80731b92003-11-22 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 Lattner3d482502003-10-02 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 Lattnerca18d192005-12-05 05:23:06 +0000[diff] [blame]272 <tt>unused</tt>, <tt>used</tt>, <tt>weak</tt><br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]273
Chris Lattner3d482502003-10-02 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 Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]277 <tt>dllexport</tt>, all target specific attributes.</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]278
Misha Brukman8395d732003-12-12 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 Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]280 <b>Supported:</b> <tt>transparent_union</tt>, <tt>unused</tt>,
Misha Brukman8395d732003-12-12 04:37:31 +0000[diff] [blame]281 <tt>deprecated</tt>, <tt>may_alias</tt><br>
Misha Brukman80731b92003-11-22 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 Lattner3d482502003-10-02 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 Lattnerb7c4bac2004-06-18 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 Lattnerb34b2732005-05-07 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 Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]296 </ol>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]297
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]298 <p>The following extensions <b>are</b> known to be supported:</p>
299
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]300 <ol>
Chris Lattnerd3dc8502004-03-16 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 Brukman80731b92003-11-22 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 Lattnerce33a1b2004-06-22 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 Brukman80731b92003-11-22 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 Brukman8395d732003-12-12 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 Brukman80731b92003-11-22 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 Criswell86a3a482003-12-18 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 Brukman80731b92003-11-22 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 Brukman8395d732003-12-12 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 Brukman80731b92003-11-22 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 Lattner7591b822004-12-08 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 Brukman80731b92003-11-22 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 Lattner3646dad2004-02-14 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 Brukman80731b92003-11-22 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 Brukman7cb4e382003-11-22 01:00:11 +0000[diff] [blame]334 </ol></li>
335
336</ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]337
Misha Brukman80731b92003-11-22 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 Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]340
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]341</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]342
Misha Brukman80731b92003-11-22 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 Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]347
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]348<div class="doc_text">
349
Reid Spencer55684c32004-12-07 08:39:08 +0000[diff] [blame]350<p>For this release, the C++ front-end is considered to be fully
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]351tested and works for a number of non-trivial programs, including LLVM
352itself.</p>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]353
354</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]355
356<!-- _______________________________________________________________________ -->
Chris Lattner141ebb62004-02-14 04:12:41 +0000[diff] [blame]357<div class="doc_subsubsection">Bugs</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]358
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]359<div class="doc_text">
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]360
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]361<ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]362<li>The C++ front-end inherits all problems afflicting the <a href="#c-fe">C
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]363 front-end</a>.</li>
Chris Lattner041e6c92004-07-17 02:04:41 +0000[diff] [blame]364
Chris Lattner5cd40922004-08-02 20:28:44 +0000[diff] [blame]365</ul>
366
Misha Brukman80731b92003-11-22 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 Lattnerd2a74272003-10-27 18:30:37 +0000[diff] [blame]377
Chris Lattner3d482502003-10-02 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 Lattnere76e9ab2003-12-12 04:25:33 +0000[diff] [blame]381href="http://gcc.gnu.org/gcc-3.4/changes.html">GCC 3.4 release notes</a>.</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]382
383<li>Destructors for local objects are not always run when a <tt>longjmp</tt> is
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]384 performed. In particular, destructors for objects in the <tt>longjmp</tt>ing
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]385 function and in the <tt>setjmp</tt> receiver function may not be run.
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]386 Objects in intervening stack frames will be destroyed, however (which is
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]387 better than most compilers).</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]388
Chris Lattner62495762003-10-02 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 Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]398 interact correctly</b>. </li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]399
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]400</ul>
Chris Lattner46ecf612003-10-07 22:14:37 +0000[diff] [blame]401
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]402</div>
403
404<!-- ======================================================================= -->
405<div class="doc_subsection">
Misha Brukman80731b92003-11-22 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 Lattner3d482502003-10-02 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 Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]416problem probably cannot be fixed.</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]417
Chris Lattnera69595e2005-10-29 07:07:09 +0000[diff] [blame]418<li><a href="http://llvm.org/PR56">Zero arg vararg functions are not
Chris Lattnerb28c3282003-10-24 04:03:19 +0000[diff] [blame]419supported</a>. This should not affect LLVM produced by the C or C++
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]420frontends.</li>
Chris Lattnerb28c3282003-10-24 04:03:19 +0000[diff] [blame]421
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]422</ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]423
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]424</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]425
Andrew Lenharth2e18c622005-05-03 16:59:09 +0000[diff] [blame]426<!-- ======================================================================= -->
427<div class="doc_subsection">
Chris Lattner683a8472005-05-16 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 Lattnera69595e2005-10-29 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 Lattner683a8472005-05-16 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 Lattnera69595e2005-10-29 07:07:09 +0000[diff] [blame]461<li><a href="http://llvm.org/PR60">[sparcv9] SparcV9 backend miscompiles
Chris Lattner683a8472005-05-16 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 Lenharth2e18c622005-05-03 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 Lattner683a8472005-05-16 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 Lenharth2e18c622005-05-03 16:59:09 +0000[diff] [blame]478
Andrew Lenharth2e18c622005-05-03 16:59:09 +0000[diff] [blame]479</ul>
480
481</div>
482
Duraid Madina9a449002005-05-14 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 Lattnera69595e2005-10-29 07:07:09 +0000[diff] [blame]497<li>The C++ front-end does not use <a href="http://llvm.org/PR406">IA64
Chris Lattner683a8472005-05-16 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 Madina9a449002005-05-14 05:48:13 +0000[diff] [blame]502
Chris Lattner683a8472005-05-16 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 Madina9a449002005-05-14 05:48:13 +0000[diff] [blame]508
509</ul>
510
511</div>
512
Chris Lattnerb62a5f02005-05-15 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 Lattner8ad30362005-10-29 05:14:01 +0000[diff] [blame]522arithmetic). This back-end is in pre-beta state.</li>
Chris Lattnerb62a5f02005-05-15 16:01:20 +0000[diff] [blame]523</ul>
Chris Lattnerb62a5f02005-05-15 16:01:20 +0000[diff] [blame]524</div>
525
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]526<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]527<div class="doc_section">
528 <a name="additionalinfo">Additional Information</a>
529</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]530<!-- *********************************************************************** -->
531
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]532<div class="doc_text">
533
Chris Lattnercb5596d2005-05-16 17:13:10 +0000[diff] [blame]534<p>A wide variety of additional information is available on the <a
Chris Lattnera69595e2005-10-29 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 Brukman96158092005-03-30 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 Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]542
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]543<p>If you have any questions or comments about LLVM, please feel free to contact
Chris Lattnera69595e2005-10-29 07:07:09 +0000[diff] [blame]544us via the <a href="http://llvm.org/docs/#maillist"> mailing
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]545lists</a>.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]546
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]547</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]548
549<!-- *********************************************************************** -->
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]550
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]551<hr>
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]552<address>
Misha Brukman8834af92003-12-21 22:53:21 +0000[diff] [blame]553 <a href="http://jigsaw.w3.org/css-validator/check/referer"><img
Misha Brukman68aab3b2003-11-22 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 Lattnera69595e2005-10-29 07:07:09 +0000[diff] [blame]558 <a href="http://llvm.org/">The LLVM Compiler Infrastructure</a><br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]559 Last modified: $Date$
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]560</address>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]561
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]562</body>
563</html>