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gerrit-public.fairphone.software / toolchain / llvm-project / e1329f4472bc8810c4ff68d857c088fc57c6af3c / . / llvm / docs / ReleaseNotes.html
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Chris Lattnerf3a7c242004-12-09 22:22:58 +0000[diff] [blame]7 <title>LLVM 1.5 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 Lattnerf3a7c242004-12-09 22:22:58 +0000[diff] [blame]11<div class="doc_title">LLVM 1.5 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 Lattnerf3a7c242004-12-09 22:22:58 +0000[diff] [blame]23 <p>Written by the <a href="http://llvm.cs.uiuc.edu">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 Lattnerf3a7c242004-12-09 22:22:58 +0000[diff] [blame]35infrastructure, release 1.5. Here we describe the status of LLVM, including any
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]36known problems and improvements from the previous release. The most up-to-date
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]37version of this document can be found on the <a
Chris Lattnerf3a7c242004-12-09 22:22:58 +0000[diff] [blame]38href="http://llvm.cs.uiuc.edu/releases/1.5/">LLVM 1.5 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
43release, please check out the <a href="http://llvm.cs.uiuc.edu">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
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]51href="http://llvm.cs.uiuc.edu/releases/">releases page</a>.</p>
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 Lattnerf3a7c242004-12-09 22:22:58 +0000[diff] [blame]63<p>This is the sixth public release of the LLVM compiler infrastructure.</p>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]64
Chris Lattner7c0241c2004-12-10 16:27:34 +0000[diff] [blame]65<p> At this time, LLVM is known to correctly compile a broad range of C and
Chris Lattnerf3a7c242004-12-09 22:22:58 +0000[diff] [blame]66C++ programs, including the SPEC CPU95 &amp; 2000 suite. TODO. It also includes
67bug fixes for those problems found since the 1.4 release.</p>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]68
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]69</div>
70
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]71<!--=========================================================================-->
72<div class="doc_subsubsection">
Chris Lattner8ebf2532004-02-25 16:36:51 +0000[diff] [blame]73<a name="newfeatures">This release implements the following new features:</a>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]74</div>
Chris Lattnere7525b52003-10-07 21:38:31 +0000[diff] [blame]75
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]76<div class="doc_text">
Chris Lattnere7525b52003-10-07 21:38:31 +0000[diff] [blame]77<ol>
Chris Lattner7bf2e542004-12-11 06:10:52 +0000[diff] [blame]78 <li>LLVM now includes an <a href="http://llvm.cs.uiuc.edu/PR415">
79 Inter-Procedural Sparse Conditional Constant Propagation</a> pass, named
80 -ipsccp, which is run by default at link-time.</li>
Chris Lattner592db402003-11-19 22:05:38 +0000[diff] [blame]81</ol>
Chris Lattner4491de62003-11-08 04:28:55 +0000[diff] [blame]82
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]83</div>
84
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]85
86<!--=========================================================================-->
87<div class="doc_subsubsection">
88In this release, the following missing features were implemented:
89</div>
Chris Lattner4491de62003-11-08 04:28:55 +0000[diff] [blame]90
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]91<div class="doc_text">
92
Chris Lattner4491de62003-11-08 04:28:55 +0000[diff] [blame]93<ol>
Chris Lattnerf3a7c242004-12-09 22:22:58 +0000[diff] [blame]94 <li></li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]95</ol>
Chris Lattnere7525b52003-10-07 21:38:31 +0000[diff] [blame]96
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]97</div>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]98
99<!--=========================================================================-->
100<div class="doc_subsubsection">
Misha Brukman017f2f32004-04-19 02:56:49 +0000[diff] [blame]101<a name="qualityofimp">In this release, the following Quality of Implementation
102issues were fixed:</a>
Chris Lattner4df78f02003-12-20 03:42:11 +0000[diff] [blame]103</div>
104
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]105<div class="doc_text">
106
Chris Lattner4df78f02003-12-20 03:42:11 +0000[diff] [blame]107<ol>
Chris Lattnerf3a7c242004-12-09 22:22:58 +0000[diff] [blame]108 <li></li>
Brian Gaeke8b05e4f2004-01-16 21:55:04 +0000[diff] [blame]109</ol>
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]110</div>
Brian Gaeke8b05e4f2004-01-16 21:55:04 +0000[diff] [blame]111
112<!--=========================================================================-->
113<div class="doc_subsubsection">
Chris Lattner2ad48782004-05-02 04:19:15 +0000[diff] [blame]114<a name="codequality">This release includes the following Code Quality
115improvements:</a>
Chris Lattner23257062004-05-23 20:42:08 +0000[diff] [blame]116</div>
Chris Lattner639579c2003-10-27 17:06:39 +0000[diff] [blame]117
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]118<div class="doc_text">
Chris Lattner639579c2003-10-27 17:06:39 +0000[diff] [blame]119<ol>
Chris Lattnerf3a7c242004-12-09 22:22:58 +0000[diff] [blame]120 <li></li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]121</ol>
Reid Spencer3e58f582004-05-23 17:23:13 +0000[diff] [blame]122</div>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]123
124<!--=========================================================================-->
125<div class="doc_subsubsection">
Misha Brukman017f2f32004-04-19 02:56:49 +0000[diff] [blame]126<a name="bugfix">In this release, the following bugs in the previous release
127were fixed:</a>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]128</div>
129
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]130<div class="doc_text">
131
Chris Lattner5cd40922004-08-02 20:28:44 +0000[diff] [blame]132<p>Bugs fixed in the LLVM Core:</p>
Chris Lattnere7525b52003-10-07 21:38:31 +0000[diff] [blame]133
134<ol>
Chris Lattnerc6141112004-12-29 04:03:23 +0000[diff] [blame]135 <li><a href="http://llvm.cs.uiuc.edu/PR490">[cbackend] Logical constant
136 expressions (and/or/xor) not implemented</a></li>
Chris Lattnerb5c253a2004-12-29 04:39:50 +0000[diff] [blame]137 <li><a href="http://llvm.cs.uiuc.edu/PR491">[dse] DSE deletes stores that
138 are partially overwritten by smaller stores</a></li>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]139</ol>
140
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]141<p>Bugs in the C/C++ front-end:</p>
142
143<ol>
Chris Lattnere1329f42005-01-03 04:20:21 +0000[diff] [blame^]144 <li><a href="http://llvm.cs.uiuc.edu/PR487">[llvmgcc] llvm-gcc incorrectly
145 rejects some constant initializers involving the addresses of array
146 elements</a></li>
Brian Gaeke730d8d62004-08-24 07:43:48 +0000[diff] [blame]147</ol>
148
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]149</div>
Reid Spencer3e58f582004-05-23 17:23:13 +0000[diff] [blame]150
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]151<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]152<div class="doc_section">
153 <a name="portability">Portability and Supported Platforms</a>
154</div>
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]155<!-- *********************************************************************** -->
156
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]157<div class="doc_text">
158
John Criswell64307722004-12-08 20:35:47 +0000[diff] [blame]159<p>LLVM is known to work on the following platforms:</p>
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]160
161<ul>
162<li>Intel and AMD machines running Red Hat Linux and FreeBSD (and probably
163 other unix-like systems).</li>
164<li>Sun UltraSPARC workstations running Solaris 8.</li>
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]165<li>Intel and AMD machines running on Win32 with the Cygwin libraries (limited
166 support is available for native builds with Visual C++).</li>
167<li>PowerPC-based Mac OS X systems, running 10.2 and above.</li>
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]168</ul>
169
Brian Gaekee3e557e2004-05-09 05:28:35 +0000[diff] [blame]170<p>The core LLVM infrastructure uses
171<a href="http://www.gnu.org/software/autoconf/">GNU autoconf</a> to adapt itself
172to the machine and operating system on which it is built. However, minor
173porting may be required to get LLVM to work on new platforms. We welcome your
174portability patches and reports of successful builds or error messages.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]175
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]176</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]177
178<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]179<div class="doc_section">
180 <a name="knownproblems">Known Problems</a>
181</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]182<!-- *********************************************************************** -->
183
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]184<div class="doc_text">
185
186<p>This section contains all known problems with the LLVM system, listed by
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]187component. As new problems are discovered, they will be added to these
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]188sections. If you run into a problem, please check the <a
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]189href="http://llvm.cs.uiuc.edu/bugs/">LLVM bug database</a> and submit a bug if
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]190there isn't already one.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]191
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]192</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]193
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]194<!-- ======================================================================= -->
195<div class="doc_subsection">
196 <a name="experimental">Experimental features included with this release</a>
197</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]198
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]199<div class="doc_text">
200
Misha Brukmanfa50a222004-05-12 21:46:05 +0000[diff] [blame]201<p>The following components of this LLVM release are either untested, known to
202be broken or unreliable, or are in early development. These components should
203not be relied on, and bugs should not be filed against them, but they may be
204useful to some people. In particular, if you would like to work on one of these
205components, please contact us on the llvmdev list.</p>
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]206
207<ul>
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]208<li>The following passes are incomplete or buggy, and may be removed in future
209 releases: <tt>-pgmdep, -memdep, -ipmodref, -cee, -branch-combine,
210 -instloops, -paths, -pre</tt></li>
211<li>The <tt>llvm-db</tt> tool is in a very early stage of development, but can
212 be used to step through programs and inspect the stack.</li>
Chris Lattnerfa835102004-12-02 17:20:17 +0000[diff] [blame]213<li>The "iterative scan" register allocator (enabled with -regalloc=iterativescan)
214 is not stable.</li>
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]215</ul>
216
217</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]218
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]219<!-- ======================================================================= -->
220<div class="doc_subsection">
221 <a name="core">Known problems with the LLVM Core</a>
222</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]223
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]224<div class="doc_text">
225
226<ul>
Reid Spencer493d9c22004-11-25 22:38:30 +0000[diff] [blame]227 <li>In the JIT, <tt>dlsym</tt> on a symbol compiled by the JIT will not work.
228 </li>
229 <li>The JIT does not use mutexes to protect its internal data structures. As
230 such, execution of a threaded program could cause these data structures to be
231 corrupted.
232 </li>
Reid Spencer493d9c22004-11-25 22:38:30 +0000[diff] [blame]233 <li><a href="http://llvm.cs.uiuc.edu/PR240">The lower-invoke pass does not
234 mark values live across a setjmp as volatile</a>. This missing feature
235 only affects targets whose setjmp/longjmp libraries do not save and restore
236 the entire register file.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]237</ul>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]238</div>
239
240<!-- ======================================================================= -->
241<div class="doc_subsection">
242 <a name="c-fe">Known problems with the C front-end</a>
243</div>
Chris Lattner178f3db2003-10-02 05:07:23 +0000[diff] [blame]244
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]245<!-- _______________________________________________________________________ -->
Chris Lattner5a8a7282003-12-14 05:03:43 +0000[diff] [blame]246<div class="doc_subsubsection">Bugs</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]247
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]248<div class="doc_text">
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]249<ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]250<li>C99 Variable sized arrays do not release stack memory when they go out of
251 scope. Thus, the following program may run out of stack space:
252<pre>
253 for (i = 0; i != 1000000; ++i) {
254 int X[n];
255 foo(X);
256 }
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]257</pre></li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]258
Misha Brukmanfa50a222004-05-12 21:46:05 +0000[diff] [blame]259<li>Initialization of global union variables can only be done <a
Misha Brukman68ef9a92004-12-04 00:45:09 +0000[diff] [blame]260href="http://llvm.cs.uiuc.edu/PR162">with the largest union member</a>.</li>
Chris Lattner1ab58dd2004-03-16 21:39:04 +0000[diff] [blame]261
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]262</ul>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]263</div>
264
265<!-- _______________________________________________________________________ -->
266<div class="doc_subsubsection">
267 Notes
268</div>
269
270<div class="doc_text">
271
272<ul>
273
274<li>Inline assembly is not yet supported.</li>
Chris Lattnerd2a74272003-10-27 18:30:37 +0000[diff] [blame]275
276<li>"long double" is transformed by the front-end into "double". There is no
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]277support for floating point data types of any size other than 32 and 64
278bits.</li>
279
280<li>The following Unix system functionality has not been tested and may not
281work:
Misha Brukman7cb4e382003-11-22 01:00:11 +0000[diff] [blame]282 <ol>
283 <li><tt>sigsetjmp</tt>, <tt>siglongjmp</tt> - These are not turned into the
284 appropriate <tt>invoke</tt>/<tt>unwind</tt> instructions. Note that
285 <tt>setjmp</tt> and <tt>longjmp</tt> <em>are</em> compiled correctly.
286 <li><tt>getcontext</tt>, <tt>setcontext</tt>, <tt>makecontext</tt>
287 - These functions have not been tested.
288 </ol></li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]289
290<li>Although many GCC extensions are supported, some are not. In particular,
291 the following extensions are known to <b>not be</b> supported:
292 <ol>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]293 <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]294 <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>
295 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Constructing-Calls.html#Constructing%20Calls">Constructing Calls</a>: Dispatching a call to another function.</li>
296 <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]297 <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]298 <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>
299 <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]300 <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>
301 <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]302 <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]303 <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]304 </ol>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]305
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]306 <p>The following GCC extensions are <b>partially</b> supported. An ignored
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]307 attribute means that the LLVM compiler ignores the presence of the attribute,
308 but the code should still work. An unsupported attribute is one which is
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]309 ignored by the LLVM compiler and will cause a different interpretation of
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]310 the program.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]311
312 <ol>
313 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Length.html#Variable%20Length">Variable Length</a>:
314 Arrays whose length is computed at run time.<br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]315 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]316
317 <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]318
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]319 Declaring that functions have no side effects or that they can never
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]320 return.<br>
321
322 <b>Supported:</b> <tt>format</tt>, <tt>format_arg</tt>, <tt>non_null</tt>,
John Criswell64307722004-12-08 20:35:47 +0000[diff] [blame]323 <tt>noreturn</tt>, <tt>constructor</tt>, <tt>destructor</tt>,
324 <tt>unused</tt>,
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]325 <tt>deprecated</tt>, <tt>warn_unused_result</tt>, <tt>weak</tt><br>
326
John Criswell64307722004-12-08 20:35:47 +0000[diff] [blame]327 <b>Ignored:</b> <tt>noinline</tt>,
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]328 <tt>always_inline</tt>, <tt>pure</tt>, <tt>const</tt>, <tt>nothrow</tt>,
329 <tt>malloc</tt>, <tt>no_instrument_function</tt>, <tt>cdecl</tt><br>
330
331 <b>Unsupported:</b> <tt>used</tt>, <tt>section</tt>, <tt>alias</tt>,
332 <tt>visibility</tt>, <tt>regparm</tt>, <tt>stdcall</tt>,
333 <tt>fastcall</tt>, all other target specific attributes</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]334
335 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Attributes.html#Variable%20Attributes">Variable Attributes</a>:
336 Specifying attributes of variables.<br>
337 <b>Supported:</b> <tt>cleanup</tt>, <tt>common</tt>, <tt>nocommon</tt>,
338 <tt>deprecated</tt>, <tt>transparent_union</tt>,
339 <tt>unused</tt>, <tt>weak</tt><br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]340
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]341 <b>Unsupported:</b> <tt>aligned</tt>, <tt>mode</tt>, <tt>packed</tt>,
342 <tt>section</tt>, <tt>shared</tt>, <tt>tls_model</tt>,
343 <tt>vector_size</tt>, <tt>dllimport</tt>,
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]344 <tt>dllexport</tt>, all target specific attributes.</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]345
Misha Brukman8395d732003-12-12 04:37:31 +0000[diff] [blame]346 <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]347 <b>Supported:</b> <tt>transparent_union</tt>, <tt>unused</tt>,
Misha Brukman8395d732003-12-12 04:37:31 +0000[diff] [blame]348 <tt>deprecated</tt>, <tt>may_alias</tt><br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]349
350 <b>Unsupported:</b> <tt>aligned</tt>, <tt>packed</tt>,
351 all target specific attributes.</li>
352
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]353 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html#Other%20Builtins">Other Builtins</a>:
354 Other built-in functions.<br>
355 We support all builtins which have a C language equivalent (e.g.,
356 <tt>__builtin_cos</tt>), <tt>__builtin_alloca</tt>,
357 <tt>__builtin_types_compatible_p</tt>, <tt>__builtin_choose_expr</tt>,
Chris Lattnerb7c4bac2004-06-18 06:26:29 +0000[diff] [blame]358 <tt>__builtin_constant_p</tt>, and <tt>__builtin_expect</tt>
359 (currently ignored). We also support builtins for ISO C99 floating
360 point comparison macros (e.g., <tt>__builtin_islessequal</tt>).</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]361 </ol>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]362
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]363 <p>The following extensions <b>are</b> known to be supported:</p>
364
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]365 <ol>
Chris Lattnerd3dc8502004-03-16 08:54:07 +0000[diff] [blame]366 <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]367 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html#Statement%20Exprs">Statement Exprs</a>: Putting statements and declarations inside expressions.</li>
368 <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]369 <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]370 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Conditionals.html#Conditionals">Conditionals</a>: Omitting the middle operand of a <code>?:</code> expression.</li>
371 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Long-Long.html#Long%20Long">Long Long</a>: Double-word integers.</li>
372 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Complex.html#Complex">Complex</a>: Data types for complex numbers.</li>
373 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Hex-Floats.html#Hex%20Floats">Hex Floats</a>:Hexadecimal floating-point constants.</li>
374 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html#Zero%20Length">Zero Length</a>: Zero-length arrays.</li>
375 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Empty-Structures.html#Empty%20Structures">Empty Structures</a>: Structures with no members.</li>
376 <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>
377 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Escaped-Newlines.html#Escaped%20Newlines">Escaped Newlines</a>: Slightly looser rules for escaped newlines.</li>
378 <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]379 <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]380 <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]381 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Compound-Literals.html#Compound%20Literals">Compound Literals</a>: Compound literals give structures, unions,
382or arrays as values.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]383 <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]384 <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]385 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Case-Ranges.html#Case%20Ranges">Case Ranges</a>: `case 1 ... 9' and such.</li>
386 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Mixed-Declarations.html#Mixed%20Declarations">Mixed Declarations</a>: Mixing declarations and code.</li>
387 <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]388 <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]389 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Dollar-Signs.html#Dollar%20Signs">Dollar Signs</a>: Dollar sign is allowed in identifiers.</li>
390 <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>
391 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Alignment.html#Alignment">Alignment</a>: Inquiring about the alignment of a type or variable.</li>
392 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Inline.html#Inline">Inline</a>: Defining inline functions (as fast as macros).</li>
393 <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>
394 <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>
395 <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]396 <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]397 <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>
398 <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]399 </ol></li>
400
401</ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]402
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]403<p>If you run into GCC extensions which have not been included in any of these
404lists, please let us know (also including whether or not they work).</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]405
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]406</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]407
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]408<!-- ======================================================================= -->
409<div class="doc_subsection">
410 <a name="c++-fe">Known problems with the C++ front-end</a>
411</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]412
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]413<div class="doc_text">
414
Reid Spencer55684c32004-12-07 08:39:08 +0000[diff] [blame]415<p>For this release, the C++ front-end is considered to be fully
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]416tested and works for a number of non-trivial programs, including LLVM
417itself.</p>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]418
419</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]420
421<!-- _______________________________________________________________________ -->
Chris Lattner141ebb62004-02-14 04:12:41 +0000[diff] [blame]422<div class="doc_subsubsection">Bugs</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]423
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]424<div class="doc_text">
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]425
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]426<ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]427<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]428 front-end</a>.</li>
Chris Lattner041e6c92004-07-17 02:04:41 +0000[diff] [blame]429
Chris Lattner5cd40922004-08-02 20:28:44 +0000[diff] [blame]430<li><b>IA-64 specific</b>: The C++ front-end does not use <a
431href="http://llvm.cs.uiuc.edu/PR406">IA64 ABI compliant layout of v-tables</a>.
Chris Lattner041e6c92004-07-17 02:04:41 +0000[diff] [blame]432In particular, it just stores function pointers instead of function
433descriptors in the vtable. This bug prevents mixing C++ code compiled with
Chris Lattner2fd93492004-08-02 20:29:51 +0000[diff] [blame]434LLVM with C++ objects compiled by other C++ compilers.</li>
Chris Lattner041e6c92004-07-17 02:04:41 +0000[diff] [blame]435
Chris Lattner5cd40922004-08-02 20:28:44 +0000[diff] [blame]436</ul>
437
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]438</div>
439
440<!-- _______________________________________________________________________ -->
441<div class="doc_subsubsection">
442 Notes
443</div>
444
445<div class="doc_text">
446
447<ul>
Chris Lattnerd2a74272003-10-27 18:30:37 +0000[diff] [blame]448
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]449<li>The C++ front-end is based on a pre-release of the GCC 3.4 C++ parser. This
450parser is significantly more standards compliant (and picky) than prior GCC
451versions. For more information, see the C++ section of the <a
Chris Lattnere76e9ab2003-12-12 04:25:33 +0000[diff] [blame]452href="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]453
454<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]455 performed. In particular, destructors for objects in the <tt>longjmp</tt>ing
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]456 function and in the <tt>setjmp</tt> receiver function may not be run.
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]457 Objects in intervening stack frames will be destroyed, however (which is
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]458 better than most compilers).</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]459
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]460<li>The LLVM C++ front-end follows the <a
461 href="http://www.codesourcery.com/cxx-abi">Itanium C++ ABI</a>.
462 This document, which is not Itanium specific, specifies a standard for name
463 mangling, class layout, v-table layout, RTTI formats, and other C++
464 representation issues. Because we use this API, code generated by the LLVM
465 compilers should be binary compatible with machine code generated by other
466 Itanium ABI C++ compilers (such as G++, the Intel and HP compilers, etc).
467 <i>However</i>, the exception handling mechanism used by LLVM is very
468 different from the model used in the Itanium ABI, so <b>exceptions will not
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]469 interact correctly</b>. </li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]470
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]471</ul>
Chris Lattner46ecf612003-10-07 22:14:37 +0000[diff] [blame]472
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]473</div>
474
475<!-- ======================================================================= -->
476<div class="doc_subsection">
477 <a name="x86-be">Known problems with the X86 back-end</a>
478</div>
479
480<div class="doc_text">
481
482<ul>
Chris Lattner5cd40922004-08-02 20:28:44 +0000[diff] [blame]483 <li>none yet</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]484</ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]485
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]486</div>
487
488<!-- ======================================================================= -->
489<div class="doc_subsection">
Misha Brukmana516e992004-07-12 16:55:41 +0000[diff] [blame]490 <a name="sparcv9-be">Known problems with the SparcV9 back-end</a>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]491</div>
492
493<div class="doc_text">
494
495<ul>
Misha Brukmana516e992004-07-12 16:55:41 +0000[diff] [blame]496<li><a href="http://llvm.cs.uiuc.edu/PR60">[sparcv9] SparcV9 backend miscompiles
497several programs in the LLVM test suite</a></li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]498</ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]499
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]500</div>
501
502<!-- ======================================================================= -->
503<div class="doc_subsection">
Chris Lattnerdf925ce2004-11-07 01:55:32 +0000[diff] [blame]504 <a name="ppc-be">Known problems with the PowerPC back-end</a>
505</div>
506
507<div class="doc_text">
508
509<ul>
510<li>none yet</li>
511</ul>
512
513</div>
514
515<!-- ======================================================================= -->
516<div class="doc_subsection">
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]517 <a name="c-be">Known problems with the C back-end</a>
518</div>
519
520<div class="doc_text">
521
522<ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]523
524<li>The C back-end produces code that violates the ANSI C Type-Based Alias
525Analysis rules. As such, special options may be necessary to compile the code
526(for example, GCC requires the <tt>-fno-strict-aliasing</tt> option). This
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]527problem probably cannot be fixed.</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]528
Chris Lattnerc679fbb2003-11-04 20:06:53 +0000[diff] [blame]529<li><a href="http://llvm.cs.uiuc.edu/PR56">Zero arg vararg functions are not
Chris Lattnerb28c3282003-10-24 04:03:19 +0000[diff] [blame]530supported</a>. This should not affect LLVM produced by the C or C++
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]531frontends.</li>
Chris Lattnerb28c3282003-10-24 04:03:19 +0000[diff] [blame]532
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]533</ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]534
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]535</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]536
537<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]538<div class="doc_section">
539 <a name="additionalinfo">Additional Information</a>
540</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]541<!-- *********************************************************************** -->
542
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]543<div class="doc_text">
544
545<p>A wide variety of additional information is available on the LLVM web page,
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]546including mailing lists and publications describing algorithms and components
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]547implemented in LLVM. The web page also contains versions of the API
548documentation which is up-to-date with the CVS version of the source code. You
549can access versions of these documents specific to this release by going into
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]550the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]551
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]552<p>If you have any questions or comments about LLVM, please feel free to contact
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