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gerrit-public.fairphone.software / toolchain / llvm-project / a38fe5fc8e31b0577d278aa906b0a22258e0877d / . / llvm / docs / ReleaseNotes.html
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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
Chris Lattnera38fe5f2006-02-05 06:39:36 +0000[diff] [blame^]77<div class="doc_text">
78<ul>
79<li>New SPARC backend.</li>
80</ul>
81</div>
John Criswell51e2a482005-06-29 16:22:34 +0000[diff] [blame]82
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]83<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]84<div class="doc_section">
85 <a name="portability">Portability and Supported Platforms</a>
86</div>
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]87<!-- *********************************************************************** -->
88
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]89<div class="doc_text">
90
John Criswell64307722004-12-08 20:35:47 +0000[diff] [blame]91<p>LLVM is known to work on the following platforms:</p>
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]92
93<ul>
Reid Spencer9803b402005-05-17 02:47:27 +0000[diff] [blame]94 <li>Intel and AMD machines running Red Hat Linux, Fedora Core and FreeBSD
95 (and probably other unix-like systems).</li>
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]96<li>Sun UltraSPARC workstations running Solaris 8.</li>
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]97<li>Intel and AMD machines running on Win32 with the Cygwin libraries (limited
98 support is available for native builds with Visual C++).</li>
Chris Lattner8ad30362005-10-29 05:14:01 +0000[diff] [blame]99<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]100<li>Alpha-based machines running Debian GNU/Linux.</li>
101<li>Itanium-based machines running Linux and HP-UX.</li>
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]102</ul>
103
Brian Gaekee3e557e2004-05-09 05:28:35 +0000[diff] [blame]104<p>The core LLVM infrastructure uses
105<a href="http://www.gnu.org/software/autoconf/">GNU autoconf</a> to adapt itself
106to the machine and operating system on which it is built. However, minor
107porting may be required to get LLVM to work on new platforms. We welcome your
108portability patches and reports of successful builds or error messages.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]109
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]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_section">
114 <a name="knownproblems">Known Problems</a>
115</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]116<!-- *********************************************************************** -->
117
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]118<div class="doc_text">
119
120<p>This section contains all known problems with the LLVM system, listed by
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]121component. As new problems are discovered, they will be added to these
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]122sections. If you run into a problem, please check the <a
Chris Lattnera69595e2005-10-29 07:07:09 +0000[diff] [blame]123href="http://llvm.org/bugs/">LLVM bug database</a> and submit a bug if
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]124there isn't already one.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]125
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]126</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]127
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]128<!-- ======================================================================= -->
129<div class="doc_subsection">
130 <a name="experimental">Experimental features included with this release</a>
131</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]132
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]133<div class="doc_text">
134
Misha Brukmanfa50a222004-05-12 21:46:05 +0000[diff] [blame]135<p>The following components of this LLVM release are either untested, known to
136be broken or unreliable, or are in early development. These components should
137not be relied on, and bugs should not be filed against them, but they may be
138useful to some people. In particular, if you would like to work on one of these
139components, please contact us on the llvmdev list.</p>
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]140
141<ul>
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]142<li>The following passes are incomplete or buggy, and may be removed in future
Chris Lattner070024a2006-01-16 01:05:00 +0000[diff] [blame]143 releases: <tt>-cee</tt></li>
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]144<li>The <tt>llvm-db</tt> tool is in a very early stage of development, but can
145 be used to step through programs and inspect the stack.</li>
Chris Lattnera38fe5f2006-02-05 06:39:36 +0000[diff] [blame^]146<li>The IA64 code generator is experimental.</li>
Chris Lattnera69595e2005-10-29 07:07:09 +0000[diff] [blame]147<li>The Alpha JIT is experimental.</li>
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]148</ul>
149
150</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]151
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]152<!-- ======================================================================= -->
153<div class="doc_subsection">
John Criswell3bdbd302005-11-08 21:11:33 +0000[diff] [blame]154 <a name="build">Known problems with the Build System</a>
155</div>
156
157<div class="doc_text">
158
159<ul>
160 <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>
161</ul>
162</div>
163
164
165<!-- ======================================================================= -->
166<div class="doc_subsection">
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]167 <a name="core">Known problems with the LLVM Core</a>
168</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]169
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]170<div class="doc_text">
171
172<ul>
Misha Brukman96158092005-03-30 19:14:24 +0000[diff] [blame]173 <li>In the JIT, <tt>dlsym()</tt> on a symbol compiled by the JIT will not
174 work.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]175</ul>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]176</div>
177
178<!-- ======================================================================= -->
179<div class="doc_subsection">
180 <a name="c-fe">Known problems with the C front-end</a>
181</div>
Chris Lattner178f3db2003-10-02 05:07:23 +0000[diff] [blame]182
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]183<!-- _______________________________________________________________________ -->
Chris Lattner5a8a7282003-12-14 05:03:43 +0000[diff] [blame]184<div class="doc_subsubsection">Bugs</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]185
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]186<div class="doc_text">
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]187<ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]188<li>C99 Variable sized arrays do not release stack memory when they go out of
189 scope. Thus, the following program may run out of stack space:
190<pre>
191 for (i = 0; i != 1000000; ++i) {
192 int X[n];
193 foo(X);
194 }
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]195</pre></li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]196
Misha Brukmanfa50a222004-05-12 21:46:05 +0000[diff] [blame]197<li>Initialization of global union variables can only be done <a
Chris Lattnera69595e2005-10-29 07:07:09 +0000[diff] [blame]198href="http://llvm.org/PR162">with the largest union member</a>.</li>
Chris Lattner1ab58dd2004-03-16 21:39:04 +0000[diff] [blame]199
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]200</ul>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]201</div>
202
203<!-- _______________________________________________________________________ -->
204<div class="doc_subsubsection">
205 Notes
206</div>
207
208<div class="doc_text">
209
210<ul>
211
212<li>Inline assembly is not yet supported.</li>
Chris Lattnerd2a74272003-10-27 18:30:37 +0000[diff] [blame]213
214<li>"long double" is transformed by the front-end into "double". There is no
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]215support for floating point data types of any size other than 32 and 64
216bits.</li>
217
218<li>The following Unix system functionality has not been tested and may not
219work:
Misha Brukman7cb4e382003-11-22 01:00:11 +0000[diff] [blame]220 <ol>
221 <li><tt>sigsetjmp</tt>, <tt>siglongjmp</tt> - These are not turned into the
222 appropriate <tt>invoke</tt>/<tt>unwind</tt> instructions. Note that
223 <tt>setjmp</tt> and <tt>longjmp</tt> <em>are</em> compiled correctly.
224 <li><tt>getcontext</tt>, <tt>setcontext</tt>, <tt>makecontext</tt>
225 - These functions have not been tested.
226 </ol></li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]227
228<li>Although many GCC extensions are supported, some are not. In particular,
229 the following extensions are known to <b>not be</b> supported:
230 <ol>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]231 <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]232 <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>
233 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Constructing-Calls.html#Constructing%20Calls">Constructing Calls</a>: Dispatching a call to another function.</li>
234 <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]235 <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]236 <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>
237 <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]238 <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>
239 <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]240 <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]241 <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]242 </ol>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]243
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]244 <p>The following GCC extensions are <b>partially</b> supported. An ignored
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]245 attribute means that the LLVM compiler ignores the presence of the attribute,
246 but the code should still work. An unsupported attribute is one which is
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]247 ignored by the LLVM compiler and will cause a different interpretation of
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]248 the program.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]249
250 <ol>
251 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Length.html#Variable%20Length">Variable Length</a>:
252 Arrays whose length is computed at run time.<br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]253 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]254
255 <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]256
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]257 Declaring that functions have no side effects or that they can never
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]258 return.<br>
259
260 <b>Supported:</b> <tt>format</tt>, <tt>format_arg</tt>, <tt>non_null</tt>,
John Criswell64307722004-12-08 20:35:47 +0000[diff] [blame]261 <tt>noreturn</tt>, <tt>constructor</tt>, <tt>destructor</tt>,
Chris Lattnerca18d192005-12-05 05:23:06 +0000[diff] [blame]262 <tt>unused</tt>, <tt>used</tt>,
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]263 <tt>deprecated</tt>, <tt>warn_unused_result</tt>, <tt>weak</tt><br>
264
John Criswell64307722004-12-08 20:35:47 +0000[diff] [blame]265 <b>Ignored:</b> <tt>noinline</tt>,
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]266 <tt>always_inline</tt>, <tt>pure</tt>, <tt>const</tt>, <tt>nothrow</tt>,
267 <tt>malloc</tt>, <tt>no_instrument_function</tt>, <tt>cdecl</tt><br>
268
Chris Lattnerca18d192005-12-05 05:23:06 +0000[diff] [blame]269 <b>Unsupported:</b> <tt>section</tt>, <tt>alias</tt>,
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]270 <tt>visibility</tt>, <tt>regparm</tt>, <tt>stdcall</tt>,
271 <tt>fastcall</tt>, all other target specific attributes</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]272
273 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Attributes.html#Variable%20Attributes">Variable Attributes</a>:
274 Specifying attributes of variables.<br>
275 <b>Supported:</b> <tt>cleanup</tt>, <tt>common</tt>, <tt>nocommon</tt>,
276 <tt>deprecated</tt>, <tt>transparent_union</tt>,
Chris Lattnerca18d192005-12-05 05:23:06 +0000[diff] [blame]277 <tt>unused</tt>, <tt>used</tt>, <tt>weak</tt><br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]278
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]279 <b>Unsupported:</b> <tt>aligned</tt>, <tt>mode</tt>, <tt>packed</tt>,
280 <tt>section</tt>, <tt>shared</tt>, <tt>tls_model</tt>,
281 <tt>vector_size</tt>, <tt>dllimport</tt>,
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]282 <tt>dllexport</tt>, all target specific attributes.</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]283
Misha Brukman8395d732003-12-12 04:37:31 +0000[diff] [blame]284 <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]285 <b>Supported:</b> <tt>transparent_union</tt>, <tt>unused</tt>,
Misha Brukman8395d732003-12-12 04:37:31 +0000[diff] [blame]286 <tt>deprecated</tt>, <tt>may_alias</tt><br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]287
288 <b>Unsupported:</b> <tt>aligned</tt>, <tt>packed</tt>,
289 all target specific attributes.</li>
290
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]291 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html#Other%20Builtins">Other Builtins</a>:
292 Other built-in functions.<br>
293 We support all builtins which have a C language equivalent (e.g.,
294 <tt>__builtin_cos</tt>), <tt>__builtin_alloca</tt>,
295 <tt>__builtin_types_compatible_p</tt>, <tt>__builtin_choose_expr</tt>,
Chris Lattnerb7c4bac2004-06-18 06:26:29 +0000[diff] [blame]296 <tt>__builtin_constant_p</tt>, and <tt>__builtin_expect</tt>
297 (currently ignored). We also support builtins for ISO C99 floating
Chris Lattnerb34b2732005-05-07 02:21:21 +0000[diff] [blame]298 point comparison macros (e.g., <tt>__builtin_islessequal</tt>),
299 <tt>__builtin_prefetch</tt>, <tt>__builtin_popcount[ll]</tt>,
300 <tt>__builtin_clz[ll]</tt>, and <tt>__builtin_ctz[ll]</tt>.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]301 </ol>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]302
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]303 <p>The following extensions <b>are</b> known to be supported:</p>
304
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]305 <ol>
Chris Lattnerd3dc8502004-03-16 08:54:07 +0000[diff] [blame]306 <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]307 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html#Statement%20Exprs">Statement Exprs</a>: Putting statements and declarations inside expressions.</li>
308 <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]309 <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]310 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Conditionals.html#Conditionals">Conditionals</a>: Omitting the middle operand of a <code>?:</code> expression.</li>
311 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Long-Long.html#Long%20Long">Long Long</a>: Double-word integers.</li>
312 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Complex.html#Complex">Complex</a>: Data types for complex numbers.</li>
313 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Hex-Floats.html#Hex%20Floats">Hex Floats</a>:Hexadecimal floating-point constants.</li>
314 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html#Zero%20Length">Zero Length</a>: Zero-length arrays.</li>
315 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Empty-Structures.html#Empty%20Structures">Empty Structures</a>: Structures with no members.</li>
316 <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>
317 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Escaped-Newlines.html#Escaped%20Newlines">Escaped Newlines</a>: Slightly looser rules for escaped newlines.</li>
318 <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]319 <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]320 <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]321 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Compound-Literals.html#Compound%20Literals">Compound Literals</a>: Compound literals give structures, unions,
322or arrays as values.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]323 <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]324 <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]325 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Case-Ranges.html#Case%20Ranges">Case Ranges</a>: `case 1 ... 9' and such.</li>
326 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Mixed-Declarations.html#Mixed%20Declarations">Mixed Declarations</a>: Mixing declarations and code.</li>
327 <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]328 <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]329 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Dollar-Signs.html#Dollar%20Signs">Dollar Signs</a>: Dollar sign is allowed in identifiers.</li>
330 <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>
331 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Alignment.html#Alignment">Alignment</a>: Inquiring about the alignment of a type or variable.</li>
332 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Inline.html#Inline">Inline</a>: Defining inline functions (as fast as macros).</li>
333 <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>
334 <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>
335 <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]336 <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]337 <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>
338 <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]339 </ol></li>
340
341</ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]342
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]343<p>If you run into GCC extensions which have not been included in any of these
344lists, please let us know (also including whether or not they work).</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]345
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]346</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]347
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]348<!-- ======================================================================= -->
349<div class="doc_subsection">
350 <a name="c++-fe">Known problems with the C++ front-end</a>
351</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]352
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]353<div class="doc_text">
354
Reid Spencer55684c32004-12-07 08:39:08 +0000[diff] [blame]355<p>For this release, the C++ front-end is considered to be fully
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]356tested and works for a number of non-trivial programs, including LLVM
357itself.</p>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]358
359</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]360
361<!-- _______________________________________________________________________ -->
Chris Lattner141ebb62004-02-14 04:12:41 +0000[diff] [blame]362<div class="doc_subsubsection">Bugs</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]363
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]364<div class="doc_text">
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]365
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]366<ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]367<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]368 front-end</a>.</li>
Chris Lattner041e6c92004-07-17 02:04:41 +0000[diff] [blame]369
Chris Lattner5cd40922004-08-02 20:28:44 +0000[diff] [blame]370</ul>
371
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]372</div>
373
374<!-- _______________________________________________________________________ -->
375<div class="doc_subsubsection">
376 Notes
377</div>
378
379<div class="doc_text">
380
381<ul>
Chris Lattnerd2a74272003-10-27 18:30:37 +0000[diff] [blame]382
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]383<li>The C++ front-end is based on a pre-release of the GCC 3.4 C++ parser. This
384parser is significantly more standards compliant (and picky) than prior GCC
385versions. For more information, see the C++ section of the <a
Chris Lattnere76e9ab2003-12-12 04:25:33 +0000[diff] [blame]386href="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]387
388<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]389 performed. In particular, destructors for objects in the <tt>longjmp</tt>ing
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]390 function and in the <tt>setjmp</tt> receiver function may not be run.
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]391 Objects in intervening stack frames will be destroyed, however (which is
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]392 better than most compilers).</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]393
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]394<li>The LLVM C++ front-end follows the <a
395 href="http://www.codesourcery.com/cxx-abi">Itanium C++ ABI</a>.
396 This document, which is not Itanium specific, specifies a standard for name
397 mangling, class layout, v-table layout, RTTI formats, and other C++
398 representation issues. Because we use this API, code generated by the LLVM
399 compilers should be binary compatible with machine code generated by other
400 Itanium ABI C++ compilers (such as G++, the Intel and HP compilers, etc).
401 <i>However</i>, the exception handling mechanism used by LLVM is very
402 different from the model used in the Itanium ABI, so <b>exceptions will not
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]403 interact correctly</b>. </li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]404
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]405</ul>
Chris Lattner46ecf612003-10-07 22:14:37 +0000[diff] [blame]406
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]407</div>
408
409<!-- ======================================================================= -->
410<div class="doc_subsection">
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]411 <a name="c-be">Known problems with the C back-end</a>
412</div>
413
414<div class="doc_text">
415
416<ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]417
418<li>The C back-end produces code that violates the ANSI C Type-Based Alias
419Analysis rules. As such, special options may be necessary to compile the code
420(for example, GCC requires the <tt>-fno-strict-aliasing</tt> option). This
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]421problem probably cannot be fixed.</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]422
Chris Lattnera69595e2005-10-29 07:07:09 +0000[diff] [blame]423<li><a href="http://llvm.org/PR56">Zero arg vararg functions are not
Chris Lattnerb28c3282003-10-24 04:03:19 +0000[diff] [blame]424supported</a>. This should not affect LLVM produced by the C or C++
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]425frontends.</li>
Chris Lattnerb28c3282003-10-24 04:03:19 +0000[diff] [blame]426
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]427</ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]428
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]429</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]430
Andrew Lenharth2e18c622005-05-03 16:59:09 +0000[diff] [blame]431<!-- ======================================================================= -->
432<div class="doc_subsection">
Chris Lattner683a8472005-05-16 17:06:29 +0000[diff] [blame]433 <a name="x86-be">Known problems with the X86 back-end</a>
434</div>
435
436<div class="doc_text">
437
438<ul>
Chris Lattnera69595e2005-10-29 07:07:09 +0000[diff] [blame]439<li><a href="http://llvm.org/PR566">Memory Mapped I/O Intrinsics do not fence
440memory</a></li>
Chris Lattner683a8472005-05-16 17:06:29 +0000[diff] [blame]441</ul>
442
443</div>
444
445<!-- ======================================================================= -->
446<div class="doc_subsection">
447 <a name="ppc-be">Known problems with the PowerPC back-end</a>
448</div>
449
450<div class="doc_text">
451
452<ul>
453<li>None yet</li>
454</ul>
455
456</div>
457
458<!-- ======================================================================= -->
459<div class="doc_subsection">
460 <a name="sparcv9-be">Known problems with the SparcV9 back-end</a>
461</div>
462
463<div class="doc_text">
464
465<ul>
Chris Lattnera69595e2005-10-29 07:07:09 +0000[diff] [blame]466<li><a href="http://llvm.org/PR60">[sparcv9] SparcV9 backend miscompiles
Chris Lattner683a8472005-05-16 17:06:29 +0000[diff] [blame]467several programs in the LLVM test suite</a></li>
468</ul>
469
470</div>
471
472<!-- ======================================================================= -->
473<div class="doc_subsection">
Andrew Lenharth2e18c622005-05-03 16:59:09 +0000[diff] [blame]474 <a name="alpha-be">Known problems with the Alpha back-end</a>
475</div>
476
477<div class="doc_text">
478
479<ul>
480
Chris Lattner683a8472005-05-16 17:06:29 +0000[diff] [blame]481<li>On 21164s, some rare FP arithmetic sequences which may trap do not have the
482appropriate nops inserted to ensure restartability.</li>
Andrew Lenharth2e18c622005-05-03 16:59:09 +0000[diff] [blame]483
Andrew Lenharth2e18c622005-05-03 16:59:09 +0000[diff] [blame]484</ul>
485
486</div>
487
Duraid Madina9a449002005-05-14 05:48:13 +0000[diff] [blame]488<!-- ======================================================================= -->
489<div class="doc_subsection">
490 <a name="ia64-be">Known problems with the IA64 back-end</a>
491</div>
492
493<div class="doc_text">
494
495<ul>
496
497<li>C++ programs are likely to fail on IA64, as calls to <tt>setjmp</tt> are
498made where the argument is not 16-byte aligned, as required on IA64. (Strictly
499speaking this is not a bug in the IA64 back-end; it will also be encountered
500when building C++ programs using the C back-end.)</li>
501
Chris Lattnera69595e2005-10-29 07:07:09 +0000[diff] [blame]502<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]503ABI compliant layout of v-tables</a>. In particular, it just stores function
504pointers instead of function descriptors in the vtable. This bug prevents
505mixing C++ code compiled with LLVM with C++ objects compiled by other C++
506compilers.</li>
Duraid Madina9a449002005-05-14 05:48:13 +0000[diff] [blame]507
Chris Lattner683a8472005-05-16 17:06:29 +0000[diff] [blame]508<li>There are a few ABI violations which will lead to problems when mixing LLVM
509output with code built with other compilers, particularly for floating-point
510programs.</li>
511
512<li>Defining vararg functions is not supported (but calling them is ok).</li>
Duraid Madina9a449002005-05-14 05:48:13 +0000[diff] [blame]513
514</ul>
515
516</div>
517
Chris Lattnerb62a5f02005-05-15 16:01:20 +0000[diff] [blame]518<!-- ======================================================================= -->
519<div class="doc_subsection">
Chris Lattnera38fe5f2006-02-05 06:39:36 +0000[diff] [blame^]520 <a name="sparcv8">Known problems with the SPARC back-end</a>
Chris Lattnerb62a5f02005-05-15 16:01:20 +0000[diff] [blame]521</div>
522
523<div class="doc_text">
524
525<ul>
Chris Lattnera38fe5f2006-02-05 06:39:36 +0000[diff] [blame^]526<li>This backend lacks a JIT compiler.</li>
Chris Lattnerb62a5f02005-05-15 16:01:20 +0000[diff] [blame]527</ul>
Chris Lattnerb62a5f02005-05-15 16:01:20 +0000[diff] [blame]528</div>
529
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]530<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]531<div class="doc_section">
532 <a name="additionalinfo">Additional Information</a>
533</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]534<!-- *********************************************************************** -->
535
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]536<div class="doc_text">
537
Chris Lattnercb5596d2005-05-16 17:13:10 +0000[diff] [blame]538<p>A wide variety of additional information is available on the <a
Chris Lattnera69595e2005-10-29 07:07:09 +0000[diff] [blame]539href="http://llvm.org">LLVM web page</a>, including <a
540href="http://llvm.org/docs/">documentation</a> and <a
541href="http://llvm.org/pubs/">publications describing algorithms and
Misha Brukman96158092005-03-30 19:14:24 +0000[diff] [blame]542components implemented in LLVM</a>. The web page also contains versions of the
543API documentation which is up-to-date with the CVS version of the source code.
544You can access versions of these documents specific to this release by going
545into the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]546
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]547<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]548us via the <a href="http://llvm.org/docs/#maillist"> mailing
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]549lists</a>.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]550
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]551</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]552
553<!-- *********************************************************************** -->
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]554
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]555<hr>
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]556<address>
Misha Brukman8834af92003-12-21 22:53:21 +0000[diff] [blame]557 <a href="http://jigsaw.w3.org/css-validator/check/referer"><img
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]558 src="http://jigsaw.w3.org/css-validator/images/vcss" alt="Valid CSS!"></a>
559 <a href="http://validator.w3.org/check/referer"><img
560 src="http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01!" /></a>
561
Chris Lattnera69595e2005-10-29 07:07:09 +0000[diff] [blame]562 <a href="http://llvm.org/">The LLVM Compiler Infrastructure</a><br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]563 Last modified: $Date$
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]564</address>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]565
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]566</body>
567</html>