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gerrit-public.fairphone.software / toolchain / llvm-project / 09c440c00a3de99ab5b70e84a3198f251a903af8 / . / 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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3<html>
4<head>
Reid Spencere4190fa2004-11-18 18:38:58 +0000[diff] [blame]5 <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]6 <link rel="stylesheet" href="llvm.css" type="text/css">
Reid Spencer09c440c2006-11-01 16:15:04 +0000[diff] [blame^]7 <title>LLVM 1.9 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
Reid Spencer09c440c2006-11-01 16:15:04 +0000[diff] [blame^]11<div class="doc_title">LLVM 1.9 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
Reid Spencer09c440c2006-11-01 16:15:04 +0000[diff] [blame^]35infrastructure, release 1.9. 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
Chris Lattner44124232006-08-08 17:27:28 +0000[diff] [blame]37up-to-date version of this document (corresponding to LLVM CVS) can be found
38on the <a
Chris Lattner578ab912005-11-08 21:29:17 +0000[diff] [blame]39href="http://llvm.org/releases/">LLVM releases web site</a>. If you are
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]40not reading this on the LLVM web pages, you should probably go there because
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]41this document may be updated after the release.</p>
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]42
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]43<p>For more information about LLVM, including information about the latest
Chris Lattnera69595e2005-10-29 07:07:09 +0000[diff] [blame]44release, please check out the <a href="http://llvm.org/">main LLVM
Chris Lattnere7525b52003-10-07 21:38:31 +0000[diff] [blame]45web site</a>. If you have questions or comments, the <a
46href="http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVM developer's mailing
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]47list</a> is a good place to send them.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]48
Chris Lattnerf3a7c242004-12-09 22:22:58 +0000[diff] [blame]49<p>Note that if you are reading this file from CVS or the main LLVM web page,
50this document applies to the <i>next</i> release, not the current one. To see
51the release notes for the current or previous releases, see the <a
Chris Lattnera69595e2005-10-29 07:07:09 +0000[diff] [blame]52href="http://llvm.org/releases/">releases page</a>.</p>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]53
54</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]55
56<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]57<div class="doc_section">
58 <a name="whatsnew">What's New?</a>
59</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]60<!-- *********************************************************************** -->
61
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]62<div class="doc_text">
63
Reid Spencer09c440c2006-11-01 16:15:04 +0000[diff] [blame^]64<p>This is the tenth public release of the LLVM Compiler Infrastructure. This
65release incorporates a large number of enhancements and new features.
Chris Lattner9f871732006-04-18 06:18:36 +0000[diff] [blame]66</p>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]67
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]68</div>
69
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]70<!--=========================================================================-->
Chris Lattner406bddf2005-05-15 05:44:51 +0000[diff] [blame]71<div class="doc_subsection">
Reid Spencer09c440c2006-11-01 16:15:04 +0000[diff] [blame^]72<a name="newfeatures">New Features in LLVM 1.9</a>
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]73</div>
Brian Gaeke8b05e4f2004-01-16 21:55:04 +0000[diff] [blame]74
Chris Lattner9f871732006-04-18 06:18:36 +0000[diff] [blame]75<!--_________________________________________________________________________-->
Reid Spencer09c440c2006-11-01 16:15:04 +0000[diff] [blame^]76<div class="doc_subsubsection"><a name="elfdwarf">DWARF debugging
77support for X86/ELF</a></div>
Chris Lattner9f871732006-04-18 06:18:36 +0000[diff] [blame]78<div class="doc_text">
Reid Spencer09c440c2006-11-01 16:15:04 +0000[diff] [blame^]79<p>The llvm-gcc4 C front-end now generates debugging info for C and C++ for
80X86/ELF platforms (Linux). This extends the PPC/Darwin and X86/Darwin debugging
81support available in release 18.8 DWARF is a standard debugging format used on
82many platforms.</p>
Chris Lattner9f871732006-04-18 06:18:36 +0000[diff] [blame]83</div>
84
85<!--_________________________________________________________________________-->
Reid Spencer09c440c2006-11-01 16:15:04 +0000[diff] [blame^]86<div class="doc_subsubsection"><a name="signedinst">Signed Instructions</a></div>
Chris Lattner9f871732006-04-18 06:18:36 +0000[diff] [blame]87<div class="doc_text">
Reid Spencer09c440c2006-11-01 16:15:04 +0000[diff] [blame^]88<p>As a step towards making LLVM's integer types signless, several new
89instructions have been added to LLVM. The DIV instruction has become UDIV, SDIV,
90and FDIV. The REM instruction has become UREM, SREM and FREM. The SHR
91instruction has become ASHR and LSHR. See the <a href="LangRef.html">Language
92 Reference</a> for details on these new instructions.</p>
Chris Lattner9f871732006-04-18 06:18:36 +0000[diff] [blame]93</div>
94
95<!--_________________________________________________________________________-->
Reid Spencer09c440c2006-11-01 16:15:04 +0000[diff] [blame^]96<div class="doc_subsubsection"><a name="featureA">New Feature C</a></div>
Chris Lattner9f871732006-04-18 06:18:36 +0000[diff] [blame]97<div class="doc_text">
Reid Spencer09c440c2006-11-01 16:15:04 +0000[diff] [blame^]98<p>Describe feature C here.</p>
Chris Lattner9f871732006-04-18 06:18:36 +0000[diff] [blame]99</div>
100
Chris Lattner89e761c2006-04-18 06:32:08 +0000[diff] [blame]101<!--_________________________________________________________________________-->
Reid Spencer09c440c2006-11-01 16:15:04 +0000[diff] [blame^]102<div class="doc_subsubsection"><a name="featureB">New Feature D</a></div>
Chris Lattner89e761c2006-04-18 06:32:08 +0000[diff] [blame]103<div class="doc_text">
Reid Spencer09c440c2006-11-01 16:15:04 +0000[diff] [blame^]104<p>Describe feature D here.</p>
Chris Lattner89e761c2006-04-18 06:32:08 +0000[diff] [blame]105</div>
106
Chris Lattner0b7fd712006-04-19 04:02:47 +0000[diff] [blame]107<!--_________________________________________________________________________-->
Reid Spencer09c440c2006-11-01 16:15:04 +0000[diff] [blame^]108<div class="doc_subsubsection"><a name="jitrelease">New Feature E</a></div>
Chris Lattner0b7fd712006-04-19 04:02:47 +0000[diff] [blame]109<div class="doc_text">
Reid Spencer09c440c2006-11-01 16:15:04 +0000[diff] [blame^]110<p>Describe feature E here.</p>
Chris Lattner0b7fd712006-04-19 04:02:47 +0000[diff] [blame]111</div>
Chris Lattner9f871732006-04-18 06:18:36 +0000[diff] [blame]112
113<!--_________________________________________________________________________-->
Chris Lattner44124232006-08-08 17:27:28 +0000[diff] [blame]114<div class="doc_subsubsection"><a name="other">Other Improvements</a></div>
Chris Lattnera38fe5f2006-02-05 06:39:36 +0000[diff] [blame]115<div class="doc_text">
Chris Lattner44124232006-08-08 17:27:28 +0000[diff] [blame]116<p>This release includes many other improvements, including improvements to
117 the optimizers and code generators (improving the generated code) changes to
118 speed up the compiler in many ways (improving algorithms and fine tuning
119 code), and changes to reduce the code size of the compiler itself.</p>
120
121<p>More specific changes include:</p>
122
Chris Lattnera38fe5f2006-02-05 06:39:36 +0000[diff] [blame]123<ul>
Chris Lattner44124232006-08-08 17:27:28 +0000[diff] [blame]124<li>LLVM 1.8 includes an initial ARM backend. This backend is in early
125 development stages.</li>
126<li>LLVM 1.8 now includes significantly better support for mingw and
127 cygwin.</li>
128<li>The <a href="CommandGuide/html/llvm-config.html">llvm-config</a> tool is
129 now built by default and has several new features.</li>
130<li>The X86 and PPC backends now use the correct platform ABI for passing
131 vectors as arguments to functions.</li>
132<li>The X86 backend now includes support for the Microsoft ML assembler
133 ("MASM").</li>
134<li>The PowerPC backend now pattern matches the 'rlwimi' instruction more
135 aggressively.</li>
136<li>Most of LLVM is now built with "-pedantic", ensuring better portability
137 to more C++ Compilers.</li>
138<li>The PowerPC backend now includes initial 64-bit support. The JIT is not
139 complete, and the static compiler has a couple of known bugs, but support
140 is mostly in place. LLVM 1.9 will include completed PPC-64 support. </li>
Chris Lattner89e761c2006-04-18 06:32:08 +0000[diff] [blame]141
Chris Lattnera38fe5f2006-02-05 06:39:36 +0000[diff] [blame]142</ul>
143</div>
John Criswell51e2a482005-06-29 16:22:34 +0000[diff] [blame]144
Chris Lattner72a269f2006-03-03 00:34:26 +0000[diff] [blame]145<!--=========================================================================-->
146<div class="doc_subsection">
Chris Lattner44124232006-08-08 17:27:28 +0000[diff] [blame]147<a name="changes">Significant Changes in LLVM 1.8</a>
Chris Lattner72a269f2006-03-03 00:34:26 +0000[diff] [blame]148</div>
149
150<div class="doc_text">
151<ul>
Chris Lattner44124232006-08-08 17:27:28 +0000[diff] [blame]152<li>The LLVM "SparcV9" backend (deprecated in LLVM 1.7) has been removed in
153LLVM 1.8. The LLVM "Sparc" backend replaces it.</li>
154<li>The --version option now prints more useful information, including the
155 build configuration for the tool.</li>
Chris Lattner72a269f2006-03-03 00:34:26 +0000[diff] [blame]156</ul>
157</div>
158
159
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]160<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]161<div class="doc_section">
162 <a name="portability">Portability and Supported Platforms</a>
163</div>
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]164<!-- *********************************************************************** -->
165
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]166<div class="doc_text">
167
John Criswell64307722004-12-08 20:35:47 +0000[diff] [blame]168<p>LLVM is known to work on the following platforms:</p>
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]169
170<ul>
Reid Spencer9803b402005-05-17 02:47:27 +0000[diff] [blame]171 <li>Intel and AMD machines running Red Hat Linux, Fedora Core and FreeBSD
172 (and probably other unix-like systems).</li>
Chris Lattner4d918bb2006-08-09 04:10:32 +0000[diff] [blame]173<li>Intel and AMD machines running on Win32 using MinGW libraries (native)</li>
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]174<li>Sun UltraSPARC workstations running Solaris 8.</li>
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]175<li>Intel and AMD machines running on Win32 with the Cygwin libraries (limited
176 support is available for native builds with Visual C++).</li>
Chris Lattner8ad30362005-10-29 05:14:01 +0000[diff] [blame]177<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]178<li>Alpha-based machines running Debian GNU/Linux.</li>
179<li>Itanium-based machines running Linux and HP-UX.</li>
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]180</ul>
181
Brian Gaekee3e557e2004-05-09 05:28:35 +0000[diff] [blame]182<p>The core LLVM infrastructure uses
183<a href="http://www.gnu.org/software/autoconf/">GNU autoconf</a> to adapt itself
184to the machine and operating system on which it is built. However, minor
185porting may be required to get LLVM to work on new platforms. We welcome your
186portability patches and reports of successful builds or error messages.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]187
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]188</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]189
190<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]191<div class="doc_section">
192 <a name="knownproblems">Known Problems</a>
193</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]194<!-- *********************************************************************** -->
195
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]196<div class="doc_text">
197
198<p>This section contains all known problems with the LLVM system, listed by
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]199component. As new problems are discovered, they will be added to these
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]200sections. If you run into a problem, please check the <a
Chris Lattnera69595e2005-10-29 07:07:09 +0000[diff] [blame]201href="http://llvm.org/bugs/">LLVM bug database</a> and submit a bug if
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]202there isn't already one.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]203
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]204</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]205
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]206<!-- ======================================================================= -->
207<div class="doc_subsection">
208 <a name="experimental">Experimental features included with this release</a>
209</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]210
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]211<div class="doc_text">
212
Misha Brukmanfa50a222004-05-12 21:46:05 +0000[diff] [blame]213<p>The following components of this LLVM release are either untested, known to
214be broken or unreliable, or are in early development. These components should
215not be relied on, and bugs should not be filed against them, but they may be
216useful to some people. In particular, if you would like to work on one of these
Chris Lattner05a225b2006-08-09 04:08:52 +0000[diff] [blame]217components, please contact us on the <a href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVMdev list</a>.</p>
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]218
219<ul>
Chris Lattner9f871732006-04-18 06:18:36 +0000[diff] [blame]220<li>The <tt>-cee</tt> pass is known to be buggy, and may be removed in in a
221 future release.</li>
Chris Lattnera38fe5f2006-02-05 06:39:36 +0000[diff] [blame]222<li>The IA64 code generator is experimental.</li>
Chris Lattnera69595e2005-10-29 07:07:09 +0000[diff] [blame]223<li>The Alpha JIT is experimental.</li>
Chris Lattner9f871732006-04-18 06:18:36 +0000[diff] [blame]224<li>"<tt>-filetype=asm</tt>" (the default) is the only supported value for the
225 <tt>-filetype</tt> llc option.</li>
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]226</ul>
227
228</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]229
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]230<!-- ======================================================================= -->
231<div class="doc_subsection">
John Criswell3bdbd302005-11-08 21:11:33 +0000[diff] [blame]232 <a name="build">Known problems with the Build System</a>
233</div>
234
235<div class="doc_text">
236
237<ul>
Chris Lattner64006062006-04-20 04:24:28 +0000[diff] [blame]238<li>none yet</li>
John Criswell3bdbd302005-11-08 21:11:33 +0000[diff] [blame]239</ul>
240</div>
241
242
243<!-- ======================================================================= -->
244<div class="doc_subsection">
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]245 <a name="core">Known problems with the LLVM Core</a>
246</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">
249
250<ul>
Misha Brukman96158092005-03-30 19:14:24 +0000[diff] [blame]251 <li>In the JIT, <tt>dlsym()</tt> on a symbol compiled by the JIT will not
252 work.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]253</ul>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]254</div>
255
256<!-- ======================================================================= -->
257<div class="doc_subsection">
258 <a name="c-fe">Known problems with the C front-end</a>
259</div>
Chris Lattner178f3db2003-10-02 05:07:23 +0000[diff] [blame]260
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]261<!-- _______________________________________________________________________ -->
Chris Lattner5a8a7282003-12-14 05:03:43 +0000[diff] [blame]262<div class="doc_subsubsection">Bugs</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]263
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]264<div class="doc_text">
Chris Lattner72a269f2006-03-03 00:34:26 +0000[diff] [blame]265
Chris Lattner9f871732006-04-18 06:18:36 +0000[diff] [blame]266<p>
Chris Lattner44124232006-08-08 17:27:28 +0000[diff] [blame]267llvm-gcc3 has many significant problems that are fixed by llvm-gcc4.
Chris Lattnerc3e92b52006-04-19 04:12:01 +0000[diff] [blame]268Two major ones include:</p>
Chris Lattner72a269f2006-03-03 00:34:26 +0000[diff] [blame]269
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]270<ul>
Chris Lattner9f871732006-04-18 06:18:36 +0000[diff] [blame]271<li>With llvm-gcc3,
272 C99 variable sized arrays do not release stack memory when they go out of
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]273 scope. Thus, the following program may run out of stack space:
274<pre>
275 for (i = 0; i != 1000000; ++i) {
276 int X[n];
277 foo(X);
278 }
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]279</pre></li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]280
Chris Lattner9f871732006-04-18 06:18:36 +0000[diff] [blame]281<li>With llvm-gcc3, Initialization of global union variables can only be done <a
Chris Lattnera69595e2005-10-29 07:07:09 +0000[diff] [blame]282href="http://llvm.org/PR162">with the largest union member</a>.</li>
Chris Lattner1ab58dd2004-03-16 21:39:04 +0000[diff] [blame]283
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]284</ul>
Chris Lattner44124232006-08-08 17:27:28 +0000[diff] [blame]285
286<p>llvm-gcc4 is far more stable and produces better code than llvm-gcc3, but
287does not currently support Link-Time-Optimization or C++ Exception Handling,
288which llvm-gcc3 does.</p>
289
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]290</div>
291
292<!-- _______________________________________________________________________ -->
293<div class="doc_subsubsection">
294 Notes
295</div>
296
297<div class="doc_text">
298
299<ul>
300
Chris Lattnerd2a74272003-10-27 18:30:37 +0000[diff] [blame]301<li>"long double" is transformed by the front-end into "double". There is no
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]302support for floating point data types of any size other than 32 and 64
303bits.</li>
304
305<li>The following Unix system functionality has not been tested and may not
306work:
Misha Brukman7cb4e382003-11-22 01:00:11 +0000[diff] [blame]307 <ol>
308 <li><tt>sigsetjmp</tt>, <tt>siglongjmp</tt> - These are not turned into the
309 appropriate <tt>invoke</tt>/<tt>unwind</tt> instructions. Note that
310 <tt>setjmp</tt> and <tt>longjmp</tt> <em>are</em> compiled correctly.
311 <li><tt>getcontext</tt>, <tt>setcontext</tt>, <tt>makecontext</tt>
312 - These functions have not been tested.
313 </ol></li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]314
315<li>Although many GCC extensions are supported, some are not. In particular,
316 the following extensions are known to <b>not be</b> supported:
317 <ol>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]318 <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]319 <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>
320 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Constructing-Calls.html#Constructing%20Calls">Constructing Calls</a>: Dispatching a call to another function.</li>
321 <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]322 <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]323 <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>
324 <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]325 <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>
326 <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]327 <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]328 <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]329 </ol>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]330
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]331 <p>The following GCC extensions are <b>partially</b> supported. An ignored
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]332 attribute means that the LLVM compiler ignores the presence of the attribute,
333 but the code should still work. An unsupported attribute is one which is
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]334 ignored by the LLVM compiler and will cause a different interpretation of
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]335 the program.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]336
337 <ol>
338 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Length.html#Variable%20Length">Variable Length</a>:
339 Arrays whose length is computed at run time.<br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]340 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]341
342 <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]343
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]344 Declaring that functions have no side effects or that they can never
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]345 return.<br>
346
347 <b>Supported:</b> <tt>format</tt>, <tt>format_arg</tt>, <tt>non_null</tt>,
John Criswell64307722004-12-08 20:35:47 +0000[diff] [blame]348 <tt>noreturn</tt>, <tt>constructor</tt>, <tt>destructor</tt>,
Chris Lattnerca18d192005-12-05 05:23:06 +0000[diff] [blame]349 <tt>unused</tt>, <tt>used</tt>,
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]350 <tt>deprecated</tt>, <tt>warn_unused_result</tt>, <tt>weak</tt><br>
351
John Criswell64307722004-12-08 20:35:47 +0000[diff] [blame]352 <b>Ignored:</b> <tt>noinline</tt>,
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]353 <tt>always_inline</tt>, <tt>pure</tt>, <tt>const</tt>, <tt>nothrow</tt>,
354 <tt>malloc</tt>, <tt>no_instrument_function</tt>, <tt>cdecl</tt><br>
355
Chris Lattnerca18d192005-12-05 05:23:06 +0000[diff] [blame]356 <b>Unsupported:</b> <tt>section</tt>, <tt>alias</tt>,
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]357 <tt>visibility</tt>, <tt>regparm</tt>, <tt>stdcall</tt>,
358 <tt>fastcall</tt>, all other target specific attributes</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]359
360 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Attributes.html#Variable%20Attributes">Variable Attributes</a>:
361 Specifying attributes of variables.<br>
362 <b>Supported:</b> <tt>cleanup</tt>, <tt>common</tt>, <tt>nocommon</tt>,
363 <tt>deprecated</tt>, <tt>transparent_union</tt>,
Chris Lattnerca18d192005-12-05 05:23:06 +0000[diff] [blame]364 <tt>unused</tt>, <tt>used</tt>, <tt>weak</tt><br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]365
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]366 <b>Unsupported:</b> <tt>aligned</tt>, <tt>mode</tt>, <tt>packed</tt>,
367 <tt>section</tt>, <tt>shared</tt>, <tt>tls_model</tt>,
368 <tt>vector_size</tt>, <tt>dllimport</tt>,
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]369 <tt>dllexport</tt>, all target specific attributes.</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]370
Misha Brukman8395d732003-12-12 04:37:31 +0000[diff] [blame]371 <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]372 <b>Supported:</b> <tt>transparent_union</tt>, <tt>unused</tt>,
Misha Brukman8395d732003-12-12 04:37:31 +0000[diff] [blame]373 <tt>deprecated</tt>, <tt>may_alias</tt><br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]374
375 <b>Unsupported:</b> <tt>aligned</tt>, <tt>packed</tt>,
376 all target specific attributes.</li>
377
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]378 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html#Other%20Builtins">Other Builtins</a>:
379 Other built-in functions.<br>
380 We support all builtins which have a C language equivalent (e.g.,
381 <tt>__builtin_cos</tt>), <tt>__builtin_alloca</tt>,
382 <tt>__builtin_types_compatible_p</tt>, <tt>__builtin_choose_expr</tt>,
Chris Lattnerb7c4bac2004-06-18 06:26:29 +0000[diff] [blame]383 <tt>__builtin_constant_p</tt>, and <tt>__builtin_expect</tt>
384 (currently ignored). We also support builtins for ISO C99 floating
Chris Lattnerb34b2732005-05-07 02:21:21 +0000[diff] [blame]385 point comparison macros (e.g., <tt>__builtin_islessequal</tt>),
386 <tt>__builtin_prefetch</tt>, <tt>__builtin_popcount[ll]</tt>,
387 <tt>__builtin_clz[ll]</tt>, and <tt>__builtin_ctz[ll]</tt>.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]388 </ol>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]389
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]390 <p>The following extensions <b>are</b> known to be supported:</p>
391
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]392 <ol>
Chris Lattnerd3dc8502004-03-16 08:54:07 +0000[diff] [blame]393 <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]394 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html#Statement%20Exprs">Statement Exprs</a>: Putting statements and declarations inside expressions.</li>
395 <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]396 <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]397 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Conditionals.html#Conditionals">Conditionals</a>: Omitting the middle operand of a <code>?:</code> expression.</li>
398 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Long-Long.html#Long%20Long">Long Long</a>: Double-word integers.</li>
399 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Complex.html#Complex">Complex</a>: Data types for complex numbers.</li>
400 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Hex-Floats.html#Hex%20Floats">Hex Floats</a>:Hexadecimal floating-point constants.</li>
401 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html#Zero%20Length">Zero Length</a>: Zero-length arrays.</li>
402 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Empty-Structures.html#Empty%20Structures">Empty Structures</a>: Structures with no members.</li>
403 <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>
404 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Escaped-Newlines.html#Escaped%20Newlines">Escaped Newlines</a>: Slightly looser rules for escaped newlines.</li>
405 <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]406 <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]407 <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]408 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Compound-Literals.html#Compound%20Literals">Compound Literals</a>: Compound literals give structures, unions,
409or arrays as values.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]410 <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]411 <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]412 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Case-Ranges.html#Case%20Ranges">Case Ranges</a>: `case 1 ... 9' and such.</li>
413 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Mixed-Declarations.html#Mixed%20Declarations">Mixed Declarations</a>: Mixing declarations and code.</li>
414 <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]415 <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]416 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Dollar-Signs.html#Dollar%20Signs">Dollar Signs</a>: Dollar sign is allowed in identifiers.</li>
417 <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>
418 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Alignment.html#Alignment">Alignment</a>: Inquiring about the alignment of a type or variable.</li>
419 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Inline.html#Inline">Inline</a>: Defining inline functions (as fast as macros).</li>
420 <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>
421 <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>
422 <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]423 <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]424 <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>
425 <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]426 </ol></li>
427
428</ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]429
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]430<p>If you run into GCC extensions which have not been included in any of these
431lists, please let us know (also including whether or not they work).</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]432
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]433</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]434
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]435<!-- ======================================================================= -->
436<div class="doc_subsection">
437 <a name="c++-fe">Known problems with the C++ front-end</a>
438</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]439
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]440<div class="doc_text">
441
Reid Spencer55684c32004-12-07 08:39:08 +0000[diff] [blame]442<p>For this release, the C++ front-end is considered to be fully
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]443tested and works for a number of non-trivial programs, including LLVM
444itself.</p>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]445
446</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]447
448<!-- _______________________________________________________________________ -->
Chris Lattner141ebb62004-02-14 04:12:41 +0000[diff] [blame]449<div class="doc_subsubsection">Bugs</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]450
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]451<div class="doc_text">
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]452
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]453<ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]454<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]455 front-end</a>.</li>
Chris Lattner041e6c92004-07-17 02:04:41 +0000[diff] [blame]456
Chris Lattner5cd40922004-08-02 20:28:44 +0000[diff] [blame]457</ul>
458
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]459</div>
460
461<!-- _______________________________________________________________________ -->
462<div class="doc_subsubsection">
463 Notes
464</div>
465
466<div class="doc_text">
467
468<ul>
Chris Lattnerd2a74272003-10-27 18:30:37 +0000[diff] [blame]469
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]470<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]471 performed. In particular, destructors for objects in the <tt>longjmp</tt>ing
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]472 function and in the <tt>setjmp</tt> receiver function may not be run.
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]473 Objects in intervening stack frames will be destroyed, however (which is
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]474 better than most compilers).</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]475
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]476<li>The LLVM C++ front-end follows the <a
477 href="http://www.codesourcery.com/cxx-abi">Itanium C++ ABI</a>.
478 This document, which is not Itanium specific, specifies a standard for name
479 mangling, class layout, v-table layout, RTTI formats, and other C++
480 representation issues. Because we use this API, code generated by the LLVM
481 compilers should be binary compatible with machine code generated by other
482 Itanium ABI C++ compilers (such as G++, the Intel and HP compilers, etc).
483 <i>However</i>, the exception handling mechanism used by LLVM is very
484 different from the model used in the Itanium ABI, so <b>exceptions will not
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]485 interact correctly</b>. </li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]486
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]487</ul>
Chris Lattner46ecf612003-10-07 22:14:37 +0000[diff] [blame]488
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]489</div>
490
491<!-- ======================================================================= -->
492<div class="doc_subsection">
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]493 <a name="c-be">Known problems with the C back-end</a>
494</div>
495
496<div class="doc_text">
497
498<ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]499
500<li>The C back-end produces code that violates the ANSI C Type-Based Alias
501Analysis rules. As such, special options may be necessary to compile the code
502(for example, GCC requires the <tt>-fno-strict-aliasing</tt> option). This
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]503problem probably cannot be fixed.</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]504
Chris Lattnera69595e2005-10-29 07:07:09 +0000[diff] [blame]505<li><a href="http://llvm.org/PR56">Zero arg vararg functions are not
Chris Lattnerb28c3282003-10-24 04:03:19 +0000[diff] [blame]506supported</a>. This should not affect LLVM produced by the C or C++
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]507frontends.</li>
Chris Lattnerb28c3282003-10-24 04:03:19 +0000[diff] [blame]508
Chris Lattner9f871732006-04-18 06:18:36 +0000[diff] [blame]509<li>The C backend does not correctly implement the <a
510href="LangRef.html#i_stacksave"><tt>llvm.stacksave</tt></a> or
511<a href="LangRef.html#i_stackrestore"><tt>llvm.stackrestore</tt></a>
512intrinsics. This means that some code compiled by it can run out of stack
513space if they depend on these (e.g. C99 varargs).</li>
514
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]515</ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]516
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]517</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]518
Andrew Lenharth2e18c622005-05-03 16:59:09 +0000[diff] [blame]519<!-- ======================================================================= -->
520<div class="doc_subsection">
Chris Lattner683a8472005-05-16 17:06:29 +0000[diff] [blame]521 <a name="x86-be">Known problems with the X86 back-end</a>
522</div>
523
524<div class="doc_text">
525
526<ul>
Chris Lattner44124232006-08-08 17:27:28 +0000[diff] [blame]527<li>none yet.</li>
Chris Lattner683a8472005-05-16 17:06:29 +0000[diff] [blame]528</ul>
529
530</div>
531
532<!-- ======================================================================= -->
533<div class="doc_subsection">
534 <a name="ppc-be">Known problems with the PowerPC back-end</a>
535</div>
536
537<div class="doc_text">
538
539<ul>
Chris Lattner9f871732006-04-18 06:18:36 +0000[diff] [blame]540<li><a href="http://llvm.org/PR642">PowerPC backend does not correctly
541implement ordered FP comparisons</a>.</li>
Chris Lattner683a8472005-05-16 17:06:29 +0000[diff] [blame]542</ul>
543
544</div>
545
546<!-- ======================================================================= -->
547<div class="doc_subsection">
Andrew Lenharth2e18c622005-05-03 16:59:09 +0000[diff] [blame]548 <a name="alpha-be">Known problems with the Alpha back-end</a>
549</div>
550
551<div class="doc_text">
552
553<ul>
554
Chris Lattner683a8472005-05-16 17:06:29 +0000[diff] [blame]555<li>On 21164s, some rare FP arithmetic sequences which may trap do not have the
556appropriate nops inserted to ensure restartability.</li>
Andrew Lenharth2e18c622005-05-03 16:59:09 +0000[diff] [blame]557
Andrew Lenharth2e18c622005-05-03 16:59:09 +0000[diff] [blame]558</ul>
559
560</div>
561
Duraid Madina9a449002005-05-14 05:48:13 +0000[diff] [blame]562<!-- ======================================================================= -->
563<div class="doc_subsection">
564 <a name="ia64-be">Known problems with the IA64 back-end</a>
565</div>
566
567<div class="doc_text">
568
569<ul>
570
571<li>C++ programs are likely to fail on IA64, as calls to <tt>setjmp</tt> are
572made where the argument is not 16-byte aligned, as required on IA64. (Strictly
573speaking this is not a bug in the IA64 back-end; it will also be encountered
574when building C++ programs using the C back-end.)</li>
575
Chris Lattnera69595e2005-10-29 07:07:09 +0000[diff] [blame]576<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]577ABI compliant layout of v-tables</a>. In particular, it just stores function
578pointers instead of function descriptors in the vtable. This bug prevents
579mixing C++ code compiled with LLVM with C++ objects compiled by other C++
580compilers.</li>
Duraid Madina9a449002005-05-14 05:48:13 +0000[diff] [blame]581
Chris Lattner683a8472005-05-16 17:06:29 +0000[diff] [blame]582<li>There are a few ABI violations which will lead to problems when mixing LLVM
583output with code built with other compilers, particularly for floating-point
584programs.</li>
585
586<li>Defining vararg functions is not supported (but calling them is ok).</li>
Duraid Madina9a449002005-05-14 05:48:13 +0000[diff] [blame]587
588</ul>
589
590</div>
591
Chris Lattnerb62a5f02005-05-15 16:01:20 +0000[diff] [blame]592<!-- ======================================================================= -->
593<div class="doc_subsection">
Chris Lattner9f871732006-04-18 06:18:36 +0000[diff] [blame]594 <a name="sparc-be">Known problems with the SPARC back-end</a>
Chris Lattnerb62a5f02005-05-15 16:01:20 +0000[diff] [blame]595</div>
596
597<div class="doc_text">
598
599<ul>
Chris Lattnere9e46a72006-04-19 04:05:21 +0000[diff] [blame]600<li>The SPARC backend only supports the 32-bit SPARC ABI (-m32), it does not
601 support the 64-bit SPARC ABI (-m64).</li>
Chris Lattnerb62a5f02005-05-15 16:01:20 +0000[diff] [blame]602</ul>
Chris Lattner9f871732006-04-18 06:18:36 +0000[diff] [blame]603
604</div>
605
Chris Lattner9f871732006-04-18 06:18:36 +0000[diff] [blame]606<!-- ======================================================================= -->
607<div class="doc_subsection">
Chris Lattner44124232006-08-08 17:27:28 +0000[diff] [blame]608 <a name="arm-be">Known problems with the ARM back-end</a>
Chris Lattner9f871732006-04-18 06:18:36 +0000[diff] [blame]609</div>
610
611<div class="doc_text">
612
613<ul>
Chris Lattner44124232006-08-08 17:27:28 +0000[diff] [blame]614<li>The ARM backend is currently in early development stages, it is not
615ready for production use.</li>
Chris Lattner9f871732006-04-18 06:18:36 +0000[diff] [blame]616</ul>
617
Chris Lattnerb62a5f02005-05-15 16:01:20 +0000[diff] [blame]618</div>
619
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]620<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]621<div class="doc_section">
622 <a name="additionalinfo">Additional Information</a>
623</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]624<!-- *********************************************************************** -->
625
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]626<div class="doc_text">
627
Chris Lattnercb5596d2005-05-16 17:13:10 +0000[diff] [blame]628<p>A wide variety of additional information is available on the <a
Chris Lattnera69595e2005-10-29 07:07:09 +0000[diff] [blame]629href="http://llvm.org">LLVM web page</a>, including <a
630href="http://llvm.org/docs/">documentation</a> and <a
631href="http://llvm.org/pubs/">publications describing algorithms and
Misha Brukman96158092005-03-30 19:14:24 +0000[diff] [blame]632components implemented in LLVM</a>. The web page also contains versions of the
633API documentation which is up-to-date with the CVS version of the source code.
634You can access versions of these documents specific to this release by going
635into the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]636
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]637<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]638us via the <a href="http://llvm.org/docs/#maillist"> mailing
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]639lists</a>.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]640
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]641</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]642
643<!-- *********************************************************************** -->
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]644
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]645<hr>
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]646<address>
Misha Brukman8834af92003-12-21 22:53:21 +0000[diff] [blame]647 <a href="http://jigsaw.w3.org/css-validator/check/referer"><img
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649 <a href="http://validator.w3.org/check/referer"><img
650 src="http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01!" /></a>
651
Chris Lattnera69595e2005-10-29 07:07:09 +0000[diff] [blame]652 <a href="http://llvm.org/">The LLVM Compiler Infrastructure</a><br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]653 Last modified: $Date$
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]654</address>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]655
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]656</body>
657</html>