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gerrit-public.fairphone.software / toolchain / llvm-project / 8ecaa456254cc090367df26fcc76164f6caf7d4a / . / 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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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">
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">
Chris Lattner64d9d2b2005-01-22 18:45:35 +0000[diff] [blame]79 Interprocedural Sparse Conditional Constant Propagation</a> pass, named
Chris Lattner7bf2e542004-12-11 06:10:52 +0000[diff] [blame]80 -ipsccp, which is run by default at link-time.</li>
Chris Lattnerf87e05b2005-02-01 01:33:52 +0000[diff] [blame]81 <li>LLVM 1.5 is now about 15% faster than LLVM 1.4 and its core data structures
Chris Lattnere14babd2005-02-13 22:27:24 +0000[diff] [blame]82 use about 30% less memory.</li>
Misha Brukmanf12594d2005-03-18 00:48:56 +0000[diff] [blame]83 <li>LLVM includes new experimental native code generators for SparcV8,
84 Alpha, and IA64.</li>
Chris Lattnere14babd2005-02-13 22:27:24 +0000[diff] [blame]85 <li>Support for Microsoft Visual Studio is improved, and <a
Chris Lattnerbe895ed2005-02-14 22:58:38 +0000[diff] [blame]86 href="GettingStartedVS.html">now documented</a>.</li>
Reid Spencer51efcef2005-04-22 20:27:33 +0000[diff] [blame]87 <li>Configuring LLVM to build targets selectively is now implemented, via the
88 <tt>--enable-targets=</tt> option. This feature is documented
89 <a href="GettingStarted.html#config">here</a>.</li>
Chris Lattnerc792eb32005-05-06 23:08:23 +0000[diff] [blame]90 <li>LLVM now supports <a href="LangRef.html#callingconv">custom and
91 target-specific calling conventions</a>.</li>
Chris Lattner592db402003-11-19 22:05:38 +0000[diff] [blame]92</ol>
Chris Lattner4491de62003-11-08 04:28:55 +0000[diff] [blame]93
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]94</div>
95
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]96
97<!--=========================================================================-->
98<div class="doc_subsubsection">
99In this release, the following missing features were implemented:
100</div>
Chris Lattner4491de62003-11-08 04:28:55 +0000[diff] [blame]101
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]102<div class="doc_text">
103
Chris Lattner4491de62003-11-08 04:28:55 +0000[diff] [blame]104<ol>
Chris Lattner81c1dd22005-02-28 16:52:28 +0000[diff] [blame]105 <li>LLVM can now create native shared libraries with '<tt>llvm-gcc ...
106 -shared -Wl,-native</tt>' (or with <tt>-Wl,-native-cbe</tt>).</li>
Chris Lattnerdb302f82005-03-11 06:16:26 +0000[diff] [blame]107 <li>LLVM now supports a new "<a href="LangRef.html#i_prefetch">llvm.prefetch
108 </a>" intrinsic, and llvm-gcc now supports __builtin_prefetch.
Chris Lattnerb34b2732005-05-07 02:21:21 +0000[diff] [blame]109 <li>LLVM now supports intrinsics for <a href="LangRef.html#int_count">bit
110 counting</a> and llvm-gcc now implements the GCC
111 <tt>__builtin_popcount</tt>, <tt>__builtin_ctz</tt>, and
112 <tt>__builtin_clz</tt> builtins.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]113</ol>
Chris Lattnere7525b52003-10-07 21:38:31 +0000[diff] [blame]114
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]115</div>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]116
117<!--=========================================================================-->
118<div class="doc_subsubsection">
Misha Brukman017f2f32004-04-19 02:56:49 +0000[diff] [blame]119<a name="qualityofimp">In this release, the following Quality of Implementation
120issues were fixed:</a>
Chris Lattner4df78f02003-12-20 03:42:11 +0000[diff] [blame]121</div>
122
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]123<div class="doc_text">
124
Chris Lattner4df78f02003-12-20 03:42:11 +0000[diff] [blame]125<ol>
Chris Lattner64d9d2b2005-01-22 18:45:35 +0000[diff] [blame]126 <li><a href="http://llvm.cs.uiuc.edu/PR448">Building LLVM in optimized mode
127 should no longer cause GCC to hit swap in the PowerPC backend.</a></li>
Brian Gaeke8b05e4f2004-01-16 21:55:04 +0000[diff] [blame]128</ol>
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]129</div>
Brian Gaeke8b05e4f2004-01-16 21:55:04 +0000[diff] [blame]130
131<!--=========================================================================-->
132<div class="doc_subsubsection">
Chris Lattner2ad48782004-05-02 04:19:15 +0000[diff] [blame]133<a name="codequality">This release includes the following Code Quality
134improvements:</a>
Chris Lattner23257062004-05-23 20:42:08 +0000[diff] [blame]135</div>
Chris Lattner639579c2003-10-27 17:06:39 +0000[diff] [blame]136
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]137<div class="doc_text">
Chris Lattner639579c2003-10-27 17:06:39 +0000[diff] [blame]138<ol>
Andrew Lenharth2e18c622005-05-03 16:59:09 +0000[diff] [blame]139 <li>Transition code for 1.0 style varargs was removed. </li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]140</ol>
Reid Spencer3e58f582004-05-23 17:23:13 +0000[diff] [blame]141</div>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]142
143<!--=========================================================================-->
144<div class="doc_subsubsection">
Misha Brukman017f2f32004-04-19 02:56:49 +0000[diff] [blame]145<a name="bugfix">In this release, the following bugs in the previous release
146were fixed:</a>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]147</div>
148
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]149<div class="doc_text">
150
Chris Lattnere7525b52003-10-07 21:38:31 +0000[diff] [blame]151
Chris Lattner1c75b252005-02-14 16:57:55 +0000[diff] [blame]152<p>Bugs fixed in the LLVM Core:</p>
Chris Lattnere7525b52003-10-07 21:38:31 +0000[diff] [blame]153<ol>
Chris Lattnerb5c253a2004-12-29 04:39:50 +0000[diff] [blame]154 <li><a href="http://llvm.cs.uiuc.edu/PR491">[dse] DSE deletes stores that
155 are partially overwritten by smaller stores</a></li>
Chris Lattner181c8182005-04-19 06:08:04 +0000[diff] [blame]156 <li><a href="http://llvm.cs.uiuc.edu/PR548">[instcombine] miscompilation of
157 setcc or setcc in one case</a></li>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]158</ol>
159
Chris Lattner1c75b252005-02-14 16:57:55 +0000[diff] [blame]160<p>Code Generator Bugs:</p>
161<ol>
162 <li><a href="http://llvm.cs.uiuc.edu/PR490">[cbackend] Logical constant
163 expressions (and/or/xor) not implemented</a></li>
164 <li><a href="http://llvm.cs.uiuc.edu/PR511">[cbackend] C backend does not
165 respect 'volatile'</a></li>
166</ol>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]167
Chris Lattner1c75b252005-02-14 16:57:55 +0000[diff] [blame]168<p>Bugs in the C/C++ front-end:</p>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]169<ol>
Chris Lattnere1329f42005-01-03 04:20:21 +0000[diff] [blame]170 <li><a href="http://llvm.cs.uiuc.edu/PR487">[llvmgcc] llvm-gcc incorrectly
171 rejects some constant initializers involving the addresses of array
172 elements</a></li>
Chris Lattner2a38aea2005-02-11 19:29:52 +0000[diff] [blame]173 <li><a href="http://llvm.cs.uiuc.edu/PR501">[llvm-g++] Crash compiling
174 anonymous union</a></li>
Chris Lattner1c75b252005-02-14 16:57:55 +0000[diff] [blame]175 <li><a href="http://llvm.cs.uiuc.edu/PR509">[llvm-g++] Do not use dynamic
176 initialization where static init will do</a></li>
Chris Lattner1f031b22005-02-15 05:28:06 +0000[diff] [blame]177 <li><a href="http://llvm.cs.uiuc.edu/PR510">[llvmgcc] Field offset
178 miscalculated for some structure fields following bit fields</a></li>
Chris Lattner385a4732005-02-15 07:02:12 +0000[diff] [blame]179 <li><a href="http://llvm.cs.uiuc.edu/PR513">[llvm-g++] Temporary lifetimes
180 incorrect for short circuit logical operations</a></li>
Chris Lattner48c23142005-02-19 07:29:25 +0000[diff] [blame]181 <li><a href="http://llvm.cs.uiuc.edu/PR517">[llvm-gcc] Crash compiling
182 bitfield &lt;-&gt; aggregate assignment</a></li>
Chris Lattner6a3ae642005-02-19 17:13:20 +0000[diff] [blame]183 <li><a href="http://llvm.cs.uiuc.edu/PR520">[llvm-g++] Error compiling
Chris Lattner3d6194f2005-02-19 17:17:32 +0000[diff] [blame]184 virtual function thunk with an unnamed argument</a></li>
Chris Lattner3a8f68e2005-02-20 23:31:49 +0000[diff] [blame]185 <li><a href="http://llvm.cs.uiuc.edu/PR522">[llvm-gcc] Crash on certain
186 C99 complex number routines</a></li>
Chris Lattnerc6e33802005-02-27 19:31:02 +0000[diff] [blame]187 <li><a href="http://llvm.cs.uiuc.edu/PR529">[llvm-g++] Crash using placement
188 new on an array type</a></li>
Brian Gaeke730d8d62004-08-24 07:43:48 +0000[diff] [blame]189</ol>
190
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]191</div>
Reid Spencer3e58f582004-05-23 17:23:13 +0000[diff] [blame]192
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]193<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]194<div class="doc_section">
195 <a name="portability">Portability and Supported Platforms</a>
196</div>
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]197<!-- *********************************************************************** -->
198
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]199<div class="doc_text">
200
John Criswell64307722004-12-08 20:35:47 +0000[diff] [blame]201<p>LLVM is known to work on the following platforms:</p>
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]202
203<ul>
204<li>Intel and AMD machines running Red Hat Linux and FreeBSD (and probably
205 other unix-like systems).</li>
206<li>Sun UltraSPARC workstations running Solaris 8.</li>
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]207<li>Intel and AMD machines running on Win32 with the Cygwin libraries (limited
208 support is available for native builds with Visual C++).</li>
209<li>PowerPC-based Mac OS X systems, running 10.2 and above.</li>
John Criswelld5234922005-05-13 20:28:15 +0000[diff] [blame]210<li>Alpha-based machines running Debian GNU/Linux.</li>
211<li>Itanium-based machines running Linux and HP-UX.</li>
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]212</ul>
213
Brian Gaekee3e557e2004-05-09 05:28:35 +0000[diff] [blame]214<p>The core LLVM infrastructure uses
215<a href="http://www.gnu.org/software/autoconf/">GNU autoconf</a> to adapt itself
216to the machine and operating system on which it is built. However, minor
217porting may be required to get LLVM to work on new platforms. We welcome your
218portability patches and reports of successful builds or error messages.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]219
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]220</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]221
222<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]223<div class="doc_section">
224 <a name="knownproblems">Known Problems</a>
225</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]226<!-- *********************************************************************** -->
227
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]228<div class="doc_text">
229
230<p>This section contains all known problems with the LLVM system, listed by
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]231component. As new problems are discovered, they will be added to these
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]232sections. If you run into a problem, please check the <a
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]233href="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]234there isn't already one.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]235
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]236</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]237
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]238<!-- ======================================================================= -->
239<div class="doc_subsection">
240 <a name="experimental">Experimental features included with this release</a>
241</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]242
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]243<div class="doc_text">
244
Misha Brukmanfa50a222004-05-12 21:46:05 +0000[diff] [blame]245<p>The following components of this LLVM release are either untested, known to
246be broken or unreliable, or are in early development. These components should
247not be relied on, and bugs should not be filed against them, but they may be
248useful to some people. In particular, if you would like to work on one of these
249components, please contact us on the llvmdev list.</p>
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]250
251<ul>
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]252<li>The following passes are incomplete or buggy, and may be removed in future
Chris Lattner38389b12005-01-28 06:13:52 +0000[diff] [blame]253 releases: <tt>-cee, -branch-combine, -instloops, -paths, -pre</tt></li>
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]254<li>The <tt>llvm-db</tt> tool is in a very early stage of development, but can
255 be used to step through programs and inspect the stack.</li>
Misha Brukman96158092005-03-30 19:14:24 +0000[diff] [blame]256<li>The "iterative scan" register allocator (enabled with
257 <tt>-regalloc=iterativescan</tt>) is not stable.</li>
John Criswelld5234922005-05-13 20:28:15 +0000[diff] [blame]258<li>The SparcV8, Alpha, and IA64 code generators are experimental.</li>
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]259</ul>
260
261</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]262
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]263<!-- ======================================================================= -->
264<div class="doc_subsection">
265 <a name="core">Known problems with the LLVM Core</a>
266</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]267
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]268<div class="doc_text">
269
270<ul>
Misha Brukman96158092005-03-30 19:14:24 +0000[diff] [blame]271 <li>In the JIT, <tt>dlsym()</tt> on a symbol compiled by the JIT will not
272 work.</li>
Reid Spencer493d9c22004-11-25 22:38:30 +0000[diff] [blame]273 <li>The JIT does not use mutexes to protect its internal data structures. As
274 such, execution of a threaded program could cause these data structures to be
275 corrupted.
276 </li>
Reid Spencer493d9c22004-11-25 22:38:30 +0000[diff] [blame]277 <li><a href="http://llvm.cs.uiuc.edu/PR240">The lower-invoke pass does not
278 mark values live across a setjmp as volatile</a>. This missing feature
279 only affects targets whose setjmp/longjmp libraries do not save and restore
280 the entire register file.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]281</ul>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]282</div>
283
284<!-- ======================================================================= -->
285<div class="doc_subsection">
286 <a name="c-fe">Known problems with the C front-end</a>
287</div>
Chris Lattner178f3db2003-10-02 05:07:23 +0000[diff] [blame]288
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]289<!-- _______________________________________________________________________ -->
Chris Lattner5a8a7282003-12-14 05:03:43 +0000[diff] [blame]290<div class="doc_subsubsection">Bugs</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]291
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]292<div class="doc_text">
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]293<ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]294<li>C99 Variable sized arrays do not release stack memory when they go out of
295 scope. Thus, the following program may run out of stack space:
296<pre>
297 for (i = 0; i != 1000000; ++i) {
298 int X[n];
299 foo(X);
300 }
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]301</pre></li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]302
Misha Brukmanfa50a222004-05-12 21:46:05 +0000[diff] [blame]303<li>Initialization of global union variables can only be done <a
Misha Brukman68ef9a92004-12-04 00:45:09 +0000[diff] [blame]304href="http://llvm.cs.uiuc.edu/PR162">with the largest union member</a>.</li>
Chris Lattner1ab58dd2004-03-16 21:39:04 +0000[diff] [blame]305
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]306</ul>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]307</div>
308
309<!-- _______________________________________________________________________ -->
310<div class="doc_subsubsection">
311 Notes
312</div>
313
314<div class="doc_text">
315
316<ul>
317
318<li>Inline assembly is not yet supported.</li>
Chris Lattnerd2a74272003-10-27 18:30:37 +0000[diff] [blame]319
320<li>"long double" is transformed by the front-end into "double". There is no
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]321support for floating point data types of any size other than 32 and 64
322bits.</li>
323
324<li>The following Unix system functionality has not been tested and may not
325work:
Misha Brukman7cb4e382003-11-22 01:00:11 +0000[diff] [blame]326 <ol>
327 <li><tt>sigsetjmp</tt>, <tt>siglongjmp</tt> - These are not turned into the
328 appropriate <tt>invoke</tt>/<tt>unwind</tt> instructions. Note that
329 <tt>setjmp</tt> and <tt>longjmp</tt> <em>are</em> compiled correctly.
330 <li><tt>getcontext</tt>, <tt>setcontext</tt>, <tt>makecontext</tt>
331 - These functions have not been tested.
332 </ol></li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]333
334<li>Although many GCC extensions are supported, some are not. In particular,
335 the following extensions are known to <b>not be</b> supported:
336 <ol>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]337 <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]338 <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>
339 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Constructing-Calls.html#Constructing%20Calls">Constructing Calls</a>: Dispatching a call to another function.</li>
340 <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]341 <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]342 <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>
343 <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]344 <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>
345 <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]346 <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]347 <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]348 </ol>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]349
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]350 <p>The following GCC extensions are <b>partially</b> supported. An ignored
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]351 attribute means that the LLVM compiler ignores the presence of the attribute,
352 but the code should still work. An unsupported attribute is one which is
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]353 ignored by the LLVM compiler and will cause a different interpretation of
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]354 the program.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]355
356 <ol>
357 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Length.html#Variable%20Length">Variable Length</a>:
358 Arrays whose length is computed at run time.<br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]359 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]360
361 <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]362
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]363 Declaring that functions have no side effects or that they can never
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]364 return.<br>
365
366 <b>Supported:</b> <tt>format</tt>, <tt>format_arg</tt>, <tt>non_null</tt>,
John Criswell64307722004-12-08 20:35:47 +0000[diff] [blame]367 <tt>noreturn</tt>, <tt>constructor</tt>, <tt>destructor</tt>,
368 <tt>unused</tt>,
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]369 <tt>deprecated</tt>, <tt>warn_unused_result</tt>, <tt>weak</tt><br>
370
John Criswell64307722004-12-08 20:35:47 +0000[diff] [blame]371 <b>Ignored:</b> <tt>noinline</tt>,
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]372 <tt>always_inline</tt>, <tt>pure</tt>, <tt>const</tt>, <tt>nothrow</tt>,
373 <tt>malloc</tt>, <tt>no_instrument_function</tt>, <tt>cdecl</tt><br>
374
375 <b>Unsupported:</b> <tt>used</tt>, <tt>section</tt>, <tt>alias</tt>,
376 <tt>visibility</tt>, <tt>regparm</tt>, <tt>stdcall</tt>,
377 <tt>fastcall</tt>, all other target specific attributes</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]378
379 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Attributes.html#Variable%20Attributes">Variable Attributes</a>:
380 Specifying attributes of variables.<br>
381 <b>Supported:</b> <tt>cleanup</tt>, <tt>common</tt>, <tt>nocommon</tt>,
382 <tt>deprecated</tt>, <tt>transparent_union</tt>,
383 <tt>unused</tt>, <tt>weak</tt><br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]384
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]385 <b>Unsupported:</b> <tt>aligned</tt>, <tt>mode</tt>, <tt>packed</tt>,
386 <tt>section</tt>, <tt>shared</tt>, <tt>tls_model</tt>,
387 <tt>vector_size</tt>, <tt>dllimport</tt>,
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]388 <tt>dllexport</tt>, all target specific attributes.</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]389
Misha Brukman8395d732003-12-12 04:37:31 +0000[diff] [blame]390 <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]391 <b>Supported:</b> <tt>transparent_union</tt>, <tt>unused</tt>,
Misha Brukman8395d732003-12-12 04:37:31 +0000[diff] [blame]392 <tt>deprecated</tt>, <tt>may_alias</tt><br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]393
394 <b>Unsupported:</b> <tt>aligned</tt>, <tt>packed</tt>,
395 all target specific attributes.</li>
396
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]397 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html#Other%20Builtins">Other Builtins</a>:
398 Other built-in functions.<br>
399 We support all builtins which have a C language equivalent (e.g.,
400 <tt>__builtin_cos</tt>), <tt>__builtin_alloca</tt>,
401 <tt>__builtin_types_compatible_p</tt>, <tt>__builtin_choose_expr</tt>,
Chris Lattnerb7c4bac2004-06-18 06:26:29 +0000[diff] [blame]402 <tt>__builtin_constant_p</tt>, and <tt>__builtin_expect</tt>
403 (currently ignored). We also support builtins for ISO C99 floating
Chris Lattnerb34b2732005-05-07 02:21:21 +0000[diff] [blame]404 point comparison macros (e.g., <tt>__builtin_islessequal</tt>),
405 <tt>__builtin_prefetch</tt>, <tt>__builtin_popcount[ll]</tt>,
406 <tt>__builtin_clz[ll]</tt>, and <tt>__builtin_ctz[ll]</tt>.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]407 </ol>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]408
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]409 <p>The following extensions <b>are</b> known to be supported:</p>
410
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]411 <ol>
Chris Lattnerd3dc8502004-03-16 08:54:07 +0000[diff] [blame]412 <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]413 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html#Statement%20Exprs">Statement Exprs</a>: Putting statements and declarations inside expressions.</li>
414 <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]415 <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]416 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Conditionals.html#Conditionals">Conditionals</a>: Omitting the middle operand of a <code>?:</code> expression.</li>
417 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Long-Long.html#Long%20Long">Long Long</a>: Double-word integers.</li>
418 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Complex.html#Complex">Complex</a>: Data types for complex numbers.</li>
419 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Hex-Floats.html#Hex%20Floats">Hex Floats</a>:Hexadecimal floating-point constants.</li>
420 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html#Zero%20Length">Zero Length</a>: Zero-length arrays.</li>
421 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Empty-Structures.html#Empty%20Structures">Empty Structures</a>: Structures with no members.</li>
422 <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>
423 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Escaped-Newlines.html#Escaped%20Newlines">Escaped Newlines</a>: Slightly looser rules for escaped newlines.</li>
424 <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]425 <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]426 <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]427 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Compound-Literals.html#Compound%20Literals">Compound Literals</a>: Compound literals give structures, unions,
428or arrays as values.</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]429 <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]430 <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]431 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Case-Ranges.html#Case%20Ranges">Case Ranges</a>: `case 1 ... 9' and such.</li>
432 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Mixed-Declarations.html#Mixed%20Declarations">Mixed Declarations</a>: Mixing declarations and code.</li>
433 <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]434 <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]435 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Dollar-Signs.html#Dollar%20Signs">Dollar Signs</a>: Dollar sign is allowed in identifiers.</li>
436 <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>
437 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Alignment.html#Alignment">Alignment</a>: Inquiring about the alignment of a type or variable.</li>
438 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Inline.html#Inline">Inline</a>: Defining inline functions (as fast as macros).</li>
439 <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>
440 <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>
441 <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]442 <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]443 <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>
444 <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]445 </ol></li>
446
447</ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]448
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]449<p>If you run into GCC extensions which have not been included in any of these
450lists, please let us know (also including whether or not they work).</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]451
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]452</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]453
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]454<!-- ======================================================================= -->
455<div class="doc_subsection">
456 <a name="c++-fe">Known problems with the C++ front-end</a>
457</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]458
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]459<div class="doc_text">
460
Reid Spencer55684c32004-12-07 08:39:08 +0000[diff] [blame]461<p>For this release, the C++ front-end is considered to be fully
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]462tested and works for a number of non-trivial programs, including LLVM
463itself.</p>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]464
465</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]466
467<!-- _______________________________________________________________________ -->
Chris Lattner141ebb62004-02-14 04:12:41 +0000[diff] [blame]468<div class="doc_subsubsection">Bugs</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]469
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]470<div class="doc_text">
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]471
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]472<ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]473<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]474 front-end</a>.</li>
Chris Lattner041e6c92004-07-17 02:04:41 +0000[diff] [blame]475
Chris Lattner5cd40922004-08-02 20:28:44 +0000[diff] [blame]476<li><b>IA-64 specific</b>: The C++ front-end does not use <a
477href="http://llvm.cs.uiuc.edu/PR406">IA64 ABI compliant layout of v-tables</a>.
Chris Lattner041e6c92004-07-17 02:04:41 +0000[diff] [blame]478In particular, it just stores function pointers instead of function
479descriptors in the vtable. This bug prevents mixing C++ code compiled with
Chris Lattner2fd93492004-08-02 20:29:51 +0000[diff] [blame]480LLVM with C++ objects compiled by other C++ compilers.</li>
Chris Lattner041e6c92004-07-17 02:04:41 +0000[diff] [blame]481
Chris Lattner5cd40922004-08-02 20:28:44 +0000[diff] [blame]482</ul>
483
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]484</div>
485
486<!-- _______________________________________________________________________ -->
487<div class="doc_subsubsection">
488 Notes
489</div>
490
491<div class="doc_text">
492
493<ul>
Chris Lattnerd2a74272003-10-27 18:30:37 +0000[diff] [blame]494
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]495<li>The C++ front-end is based on a pre-release of the GCC 3.4 C++ parser. This
496parser is significantly more standards compliant (and picky) than prior GCC
497versions. For more information, see the C++ section of the <a
Chris Lattnere76e9ab2003-12-12 04:25:33 +0000[diff] [blame]498href="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]499
500<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]501 performed. In particular, destructors for objects in the <tt>longjmp</tt>ing
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]502 function and in the <tt>setjmp</tt> receiver function may not be run.
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]503 Objects in intervening stack frames will be destroyed, however (which is
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]504 better than most compilers).</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]505
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]506<li>The LLVM C++ front-end follows the <a
507 href="http://www.codesourcery.com/cxx-abi">Itanium C++ ABI</a>.
508 This document, which is not Itanium specific, specifies a standard for name
509 mangling, class layout, v-table layout, RTTI formats, and other C++
510 representation issues. Because we use this API, code generated by the LLVM
511 compilers should be binary compatible with machine code generated by other
512 Itanium ABI C++ compilers (such as G++, the Intel and HP compilers, etc).
513 <i>However</i>, the exception handling mechanism used by LLVM is very
514 different from the model used in the Itanium ABI, so <b>exceptions will not
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]515 interact correctly</b>. </li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]516
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]517</ul>
Chris Lattner46ecf612003-10-07 22:14:37 +0000[diff] [blame]518
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]519</div>
520
521<!-- ======================================================================= -->
522<div class="doc_subsection">
523 <a name="x86-be">Known problems with the X86 back-end</a>
524</div>
525
526<div class="doc_text">
527
528<ul>
John Criswelld5234922005-05-13 20:28:15 +0000[diff] [blame]529 <li>None yet</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]530</ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]531
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]532</div>
533
534<!-- ======================================================================= -->
535<div class="doc_subsection">
Misha Brukmana516e992004-07-12 16:55:41 +0000[diff] [blame]536 <a name="sparcv9-be">Known problems with the SparcV9 back-end</a>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]537</div>
538
539<div class="doc_text">
540
541<ul>
Misha Brukmana516e992004-07-12 16:55:41 +0000[diff] [blame]542<li><a href="http://llvm.cs.uiuc.edu/PR60">[sparcv9] SparcV9 backend miscompiles
543several programs in the LLVM test suite</a></li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]544</ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]545
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]546</div>
547
548<!-- ======================================================================= -->
549<div class="doc_subsection">
Chris Lattnerdf925ce2004-11-07 01:55:32 +0000[diff] [blame]550 <a name="ppc-be">Known problems with the PowerPC back-end</a>
551</div>
552
553<div class="doc_text">
554
555<ul>
John Criswelld5234922005-05-13 20:28:15 +0000[diff] [blame]556<li>None yet</li>
Chris Lattnerdf925ce2004-11-07 01:55:32 +0000[diff] [blame]557</ul>
558
559</div>
560
561<!-- ======================================================================= -->
562<div class="doc_subsection">
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]563 <a name="c-be">Known problems with the C back-end</a>
564</div>
565
566<div class="doc_text">
567
568<ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]569
570<li>The C back-end produces code that violates the ANSI C Type-Based Alias
571Analysis rules. As such, special options may be necessary to compile the code
572(for example, GCC requires the <tt>-fno-strict-aliasing</tt> option). This
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]573problem probably cannot be fixed.</li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]574
Chris Lattnerc679fbb2003-11-04 20:06:53 +0000[diff] [blame]575<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]576supported</a>. This should not affect LLVM produced by the C or C++
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]577frontends.</li>
Chris Lattnerb28c3282003-10-24 04:03:19 +0000[diff] [blame]578
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]579</ul>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]580
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]581</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]582
Andrew Lenharth2e18c622005-05-03 16:59:09 +0000[diff] [blame]583<!-- ======================================================================= -->
584<div class="doc_subsection">
585 <a name="alpha-be">Known problems with the Alpha back-end</a>
586</div>
587
588<div class="doc_text">
589
590<ul>
591
592<li>On 21164s, some rare FP arithmatic sequences which may trap do not have the appropriate nops inserted to ensure restartability.</li>
593
594<li>Vararg functions are not supported.</li>
595
Andrew Lenharth8ecaa452005-05-14 17:43:00 +0000[diff] [blame^]596<li>Due to the vararg problems, C++ exceptions do not work. Small changes are required to the CFE (which break correctness in the exception handler) to compile the exception handling library (and thus the C++ standard library).</li>
597
Andrew Lenharth2e18c622005-05-03 16:59:09 +0000[diff] [blame]598</ul>
599
600</div>
601
Duraid Madina9a449002005-05-14 05:48:13 +0000[diff] [blame]602<!-- ======================================================================= -->
603<div class="doc_subsection">
604 <a name="ia64-be">Known problems with the IA64 back-end</a>
605</div>
606
607<div class="doc_text">
608
609<ul>
610
611<li>C++ programs are likely to fail on IA64, as calls to <tt>setjmp</tt> are
612made where the argument is not 16-byte aligned, as required on IA64. (Strictly
613speaking this is not a bug in the IA64 back-end; it will also be encountered
614when building C++ programs using the C back-end.)</li>
615
616<li>There are a few ABI violations which will lead to problems
617when mixing LLVM output with code built with other compilers,
618particularly for C++ and floating-point programs.</li>
619
620<li>Vararg functions are not supported.</li>
621
622</ul>
623
624</div>
625
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]626<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]627<div class="doc_section">
628 <a name="additionalinfo">Additional Information</a>
629</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]630<!-- *********************************************************************** -->
631
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]632<div class="doc_text">
633
634<p>A wide variety of additional information is available on the LLVM web page,
Misha Brukman96158092005-03-30 19:14:24 +0000[diff] [blame]635including <a href="http://llvm.cs.uiuc.edu/docs/#maillist">mailing lists</a> and
636<a href="http://llvm.cs.uiuc.edu/pubs/">publications describing algorithms and
637components implemented in LLVM</a>. The web page also contains versions of the
638API documentation which is up-to-date with the CVS version of the source code.
639You can access versions of these documents specific to this release by going
640into the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]641
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]642<p>If you have any questions or comments about LLVM, please feel free to contact
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]643us via the <a href="http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev">mailing
644lists</a>.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]645
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]646</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]647
648<!-- *********************************************************************** -->
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]649
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]650<hr>
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]651<address>
Misha Brukman8834af92003-12-21 22:53:21 +0000[diff] [blame]652 <a href="http://jigsaw.w3.org/css-validator/check/referer"><img
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]653 src="http://jigsaw.w3.org/css-validator/images/vcss" alt="Valid CSS!"></a>
654 <a href="http://validator.w3.org/check/referer"><img
655 src="http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01!" /></a>
656
Misha Brukman7cb4e382003-11-22 01:00:11 +0000[diff] [blame]657 <a href="http://llvm.cs.uiuc.edu">The LLVM Compiler Infrastructure</a><br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]658 Last modified: $Date$
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]659</address>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]660
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]661</body>
662</html>