Gitiles
Code Review Sign In
gerrit-public.fairphone.software / toolchain / llvm-project / bfc17d0157015447489cb2e5aff3c379b217e7cd / . / llvm / docs / ReleaseNotes.html
blob: 01a39a7ce071a9c3d7338167de7b85eec5fe92d4 [file] [log] [blame]
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]1<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
2 "http://www.w3.org/TR/html4/strict.dtd">
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">
Dan Gohman62af9d22010-05-03 23:51:05 +0000[diff] [blame]7 <title>LLVM 2.8 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
Dan Gohman62af9d22010-05-03 23:51:05 +0000[diff] [blame]11<div class="doc_title">LLVM 2.8 Release Notes</div>
Mikhail Glushenkov024f7cf2008-10-13 02:08:34 +0000[diff] [blame]12
Chris Lattnerc871bac2010-03-17 04:02:39 +0000[diff] [blame]13<img align=right src="http://llvm.org/img/DragonSmall.png"
Gabor Greif27b166352010-04-22 10:21:43 +0000[diff] [blame]14 width="136" height="136" alt="LLVM Dragon Logo">
Chris Lattnerc871bac2010-03-17 04:02:39 +0000[diff] [blame]15
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]16<ol>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]17 <li><a href="#intro">Introduction</a></li>
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]18 <li><a href="#subproj">Sub-project Status Update</a></li>
Dan Gohman62af9d22010-05-03 23:51:05 +0000[diff] [blame]19 <li><a href="#externalproj">External Projects Using LLVM 2.8</a></li>
20 <li><a href="#whatsnew">What's New in LLVM 2.8?</a></li>
Chris Lattner77a51732004-04-30 22:17:12 +0000[diff] [blame]21 <li><a href="GettingStarted.html">Installation Instructions</a></li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]22 <li><a href="#portability">Portability and Supported Platforms</a></li>
Dan Gohmanad888912008-10-14 16:23:02 +0000[diff] [blame]23 <li><a href="#knownproblems">Known Problems</a></li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]24 <li><a href="#additionalinfo">Additional Information</a></li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]25</ol>
26
Chris Lattner020e1fc2004-05-23 21:07:27 +0000[diff] [blame]27<div class="doc_author">
Dan Gohmanad888912008-10-14 16:23:02 +0000[diff] [blame]28 <p>Written by the <a href="http://llvm.org">LLVM Team</a></p>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]29</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]30
Chris Lattner656db162010-04-22 05:41:35 +0000[diff] [blame]31<h1 style="color:red">These are in-progress notes for the upcoming LLVM 2.8
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]32release.<br>
33You may prefer the
Dan Gohman62af9d22010-05-03 23:51:05 +0000[diff] [blame]34<a href="http://llvm.org/releases/2.7/docs/ReleaseNotes.html">LLVM 2.7
35Release Notes</a>.</h1>
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]36
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]37<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]38<div class="doc_section">
39 <a name="intro">Introduction</a>
40</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]41<!-- *********************************************************************** -->
42
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]43<div class="doc_text">
44
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]45<p>This document contains the release notes for the LLVM Compiler
Dan Gohman3b763f42010-05-03 23:52:21 +0000[diff] [blame]46Infrastructure, release 2.8. Here we describe the status of LLVM, including
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]47major improvements from the previous release and significant known problems.
Mikhail Glushenkov25422542009-03-01 18:09:47 +0000[diff] [blame]48All LLVM releases may be downloaded from the <a
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]49href="http://llvm.org/releases/">LLVM releases web site</a>.</p>
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]50
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]51<p>For more information about LLVM, including information about the latest
Chris Lattnera69595e2005-10-29 07:07:09 +0000[diff] [blame]52release, please check out the <a href="http://llvm.org/">main LLVM
Chris Lattnere7525b52003-10-07 21:38:31 +0000[diff] [blame]53web site</a>. If you have questions or comments, the <a
Chris Lattner0b1c9a52010-03-17 04:41:49 +0000[diff] [blame]54href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVM Developer's
55Mailing List</a> is a good place to send them.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]56
Mikhail Glushenkov024f7cf2008-10-13 02:08:34 +0000[diff] [blame]57<p>Note that if you are reading this file from a Subversion checkout or the
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]58main LLVM web page, this document applies to the <i>next</i> release, not the
Gabor Greif355f81c2008-10-14 11:00:32 +0000[diff] [blame]59current one. To see the release notes for a specific release, please see the
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]60<a href="http://llvm.org/releases/">releases page</a>.</p>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]61
62</div>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]63
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]64
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]65<!--
66Almost dead code.
67 include/llvm/Analysis/LiveValues.h => Dan
68 lib/Transforms/IPO/MergeFunctions.cpp => consider for 2.8.
69 llvm/Analysis/PointerTracking.h => Edwin wants this, consider for 2.8.
Chris Lattner06971182010-04-13 06:37:00 +0000[diff] [blame]70 ABCD, GEPSplitterPass
Chris Lattner89ea59d2010-01-16 21:25:13 +0000[diff] [blame]71 MSIL backend?
Chris Lattner10a3cc42010-03-17 06:41:58 +0000[diff] [blame]72 lib/Transforms/Utils/SSI.cpp -> ABCD depends on it.
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]73-->
74
75
Dan Gohman62af9d22010-05-03 23:51:05 +0000[diff] [blame]76<!-- Features that need text if they're finished for 2.8:
Chris Lattnera67df2d2010-04-22 06:28:20 +0000[diff] [blame]77 combiner-aa?
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]78 strong phi elim
Chris Lattner87e04952010-04-21 05:17:40 +0000[diff] [blame]79 llvm.dbg.value: variable debug info for optimized code
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]80 loop dependence analysis
Chris Lattner2b8a52e2008-02-10 07:46:44 +0000[diff] [blame]81 -->
Mikhail Glushenkov024f7cf2008-10-13 02:08:34 +0000[diff] [blame]82
Chris Lattnerc4d68542008-10-12 19:47:48 +0000[diff] [blame]83 <!-- for announcement email:
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]84 Logo web page.
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]85 Many new papers added to /pubs/
Chris Lattnerd02da042009-02-25 06:34:50 +0000[diff] [blame]86 -->
Chris Lattner2b8a52e2008-02-10 07:46:44 +0000[diff] [blame]87
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]88<!-- *********************************************************************** -->
89<div class="doc_section">
90 <a name="subproj">Sub-project Status Update</a>
Chris Lattner625a3d82008-06-08 21:34:41 +0000[diff] [blame]91</div>
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]92<!-- *********************************************************************** -->
Chris Lattner625a3d82008-06-08 21:34:41 +0000[diff] [blame]93
94<div class="doc_text">
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]95<p>
Dan Gohman62af9d22010-05-03 23:51:05 +0000[diff] [blame]96The LLVM 2.8 distribution currently consists of code from the core LLVM
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]97repository (which roughly includes the LLVM optimizers, code generators
98and supporting tools), the Clang repository and the llvm-gcc repository. In
99addition to this code, the LLVM Project includes other sub-projects that are in
100development. Here we include updates on these subprojects.
Bill Wendlingf170d2e2009-03-02 04:28:57 +0000[diff] [blame]101</p>
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]102
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]103</div>
104
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]105
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]106<!--=========================================================================-->
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]107<div class="doc_subsection">
Chris Lattner44c09cd2008-10-13 18:11:54 +0000[diff] [blame]108<a name="clang">Clang: C/C++/Objective-C Frontend Toolkit</a>
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]109</div>
110
111<div class="doc_text">
112
Chris Lattner5de7f6e2010-04-26 17:42:18 +0000[diff] [blame]113<p><a href="http://clang.llvm.org/">Clang</a> is an LLVM front end for the C,
114C++, and Objective-C languages. Clang aims to provide a better user experience
115through expressive diagnostics, a high level of conformance to language
116standards, fast compilation, and low memory use. Like LLVM, Clang provides a
117modular, library-based architecture that makes it suitable for creating or
118integrating with other development tools. Clang is considered a
119production-quality compiler for C and Objective-C on x86 (32- and 64-bit).</p>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]120
Chris Lattnerb3fa6bf2010-07-21 15:57:40 +0000[diff] [blame]121<p>In the LLVM 2.8 time-frame, the Clang team has made many improvements:</p>
Bill Wendlingef362462008-10-27 09:27:33 +0000[diff] [blame]122
Daniel Dunbarc11b40f2008-10-14 23:25:09 +0000[diff] [blame]123<ul>
David Chisnall17dff472010-04-25 19:13:33 +0000[diff] [blame]124
Bill Wendling87adbe42009-03-02 04:28:18 +0000[diff] [blame]125</ul>
Chris Lattner44c09cd2008-10-13 18:11:54 +0000[diff] [blame]126</div>
127
128<!--=========================================================================-->
129<div class="doc_subsection">
130<a name="clangsa">Clang Static Analyzer</a>
131</div>
132
133<div class="doc_text">
134
Chris Lattner2284b6a2010-04-22 06:38:11 +0000[diff] [blame]135<p>The <a href="http://clang-analyzer.llvm.org/">Clang Static Analyzer</a>
136 project is an effort to use static source code analysis techniques to
137 automatically find bugs in C and Objective-C programs (and hopefully <a
138 href="http://clang-analyzer.llvm.org/dev_cxx.html">C++ in the
139 future</a>!). The tool is very good at finding bugs that occur on specific
140 paths through code, such as on error conditions.</p>
Chris Lattnerbcffa5a2008-10-14 00:52:49 +0000[diff] [blame]141
Chris Lattnerb3fa6bf2010-07-21 15:57:40 +0000[diff] [blame]142<p>In the LLVM 2.8 time-frame,
Chris Lattner2284b6a2010-04-22 06:38:11 +0000[diff] [blame]143</p>
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]144
145</div>
146
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]147<!--=========================================================================-->
148<div class="doc_subsection">
Nicolas Geoffraye5ec9322008-10-14 19:23:04 +0000[diff] [blame]149<a name="vmkit">VMKit: JVM/CLI Virtual Machine Implementation</a>
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]150</div>
151
152<div class="doc_text">
153<p>
Nicolas Geoffraye5ec9322008-10-14 19:23:04 +0000[diff] [blame]154The <a href="http://vmkit.llvm.org/">VMKit project</a> is an implementation of
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]155a JVM and a CLI Virtual Machine (Microsoft .NET is an
156implementation of the CLI) using LLVM for static and just-in-time
157compilation.</p>
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]158
Chris Lattnerb3fa6bf2010-07-21 15:57:40 +0000[diff] [blame]159<p>With the release of LLVM 2.8, ...</p>
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]160
161</div>
162
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]163
164<!--=========================================================================-->
165<div class="doc_subsection">
166<a name="compiler-rt">compiler-rt: Compiler Runtime Library</a>
167</div>
168
169<div class="doc_text">
170<p>
171The new LLVM <a href="http://compiler-rt.llvm.org/">compiler-rt project</a>
172is a simple library that provides an implementation of the low-level
173target-specific hooks required by code generation and other runtime components.
174For example, when compiling for a 32-bit target, converting a double to a 64-bit
175unsigned integer is compiled into a runtime call to the "__fixunsdfdi"
176function. The compiler-rt library provides highly optimized implementations of
177this and other low-level routines (some are 3x faster than the equivalent
178libgcc routines).</p>
179
180<p>
181All of the code in the compiler-rt project is available under the standard LLVM
Chris Lattnerb3fa6bf2010-07-21 15:57:40 +0000[diff] [blame]182License, a "BSD-style" license. New in LLVM 2.8:
183
184Soft float support
185</p>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]186
187</div>
188
189<!--=========================================================================-->
190<div class="doc_subsection">
Duncan Sands92452b92010-04-02 09:23:15 +0000[diff] [blame]191<a name="dragonegg">DragonEgg: llvm-gcc ported to gcc-4.5</a>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]192</div>
193
194<div class="doc_text">
195<p>
Duncan Sands92452b92010-04-02 09:23:15 +0000[diff] [blame]196<a href="http://dragonegg.llvm.org/">DragonEgg</a> is a port of llvm-gcc to
197gcc-4.5. Unlike llvm-gcc, which makes many intrusive changes to the underlying
198gcc-4.2 code, dragonegg in theory does not require any gcc-4.5 modifications
199whatsoever (currently one small patch is needed). This is thanks to the new
200<a href="http://gcc.gnu.org/wiki/plugins">gcc plugin architecture</a>, which
201makes it possible to modify the behaviour of gcc at runtime by loading a plugin,
202which is nothing more than a dynamic library which conforms to the gcc plugin
203interface. DragonEgg is a gcc plugin that causes the LLVM optimizers to be run
204instead of the gcc optimizers, and the LLVM code generators instead of the gcc
205code generators, just like llvm-gcc. To use it, you add
206"-fplugin=path/dragonegg.so" to the gcc-4.5 command line, and gcc-4.5 magically
207becomes llvm-gcc-4.5!
208</p>
209
210<p>
211DragonEgg is still a work in progress. Currently C works very well, while C++,
212Ada and Fortran work fairly well. All other languages either don't work at all,
213or only work poorly. For the moment only the x86-32 and x86-64 targets are
Duncan Sands4dd125e2010-04-20 19:40:58 +0000[diff] [blame]214supported, and only on linux and darwin (darwin needs an additional gcc patch).
Duncan Sands92452b92010-04-02 09:23:15 +0000[diff] [blame]215</p>
216
217<p>
Chris Lattnerb3fa6bf2010-07-21 15:57:40 +0000[diff] [blame]2182.8 status here.
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]219</p>
220
221</div>
222
223
224<!--=========================================================================-->
225<div class="doc_subsection">
226<a name="mc">llvm-mc: Machine Code Toolkit</a>
227</div>
228
229<div class="doc_text">
230<p>
Chris Lattner2284b6a2010-04-22 06:38:11 +0000[diff] [blame]231The LLVM Machine Code (aka MC) sub-project of LLVM was created to solve a number
232of problems in the realm of assembly, disassembly, object file format handling,
233and a number of other related areas that CPU instruction-set level tools work
234in. It is a sub-project of LLVM which provides it with a number of advantages
235over other compilers that do not have tightly integrated assembly-level tools.
236For a gentle introduction, please see the <a
237href="http://blog.llvm.org/2010/04/intro-to-llvm-mc-project.html">Intro to the
238LLVM MC Project Blog Post</a>.
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]239</p>
240
Chris Lattnerb3fa6bf2010-07-21 15:57:40 +0000[diff] [blame]241<p>2.8 status here</p>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]242</div>
243
244
Chris Lattner53e06f92009-02-26 22:33:38 +0000[diff] [blame]245<!-- *********************************************************************** -->
246<div class="doc_section">
Chris Lattnerb3fa6bf2010-07-21 15:57:40 +0000[diff] [blame]247 <a name="externalproj">External Open Source Projects Using LLVM 2.8</a>
Chris Lattner53e06f92009-02-26 22:33:38 +0000[diff] [blame]248</div>
249<!-- *********************************************************************** -->
250
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]251<div class="doc_text">
252
253<p>An exciting aspect of LLVM is that it is used as an enabling technology for
254 a lot of other language and tools projects. This section lists some of the
Chris Lattnerb3fa6bf2010-07-21 15:57:40 +0000[diff] [blame]255 projects that have already been updated to work with LLVM 2.8.</p>
Chris Lattnerdf85c892010-04-26 17:38:10 +0000[diff] [blame]256</div>
257
Chris Lattner64694df2010-04-22 21:34:16 +0000[diff] [blame]258
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]259<!-- *********************************************************************** -->
260<div class="doc_section">
Chris Lattnerb3fa6bf2010-07-21 15:57:40 +0000[diff] [blame]261 <a name="whatsnew">What's New in LLVM 2.8?</a>
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]262</div>
263<!-- *********************************************************************** -->
264
Chris Lattnerb7bc2aa2008-06-08 22:59:35 +0000[diff] [blame]265<div class="doc_text">
266
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]267<p>This release includes a huge number of bug fixes, performance tweaks and
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]268minor improvements. Some of the major improvements and new features are listed
269in this section.
Chris Lattnerb7bc2aa2008-06-08 22:59:35 +0000[diff] [blame]270</p>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]271
Chris Lattnera67df2d2010-04-22 06:28:20 +0000[diff] [blame]272</div>
273
274<!--=========================================================================-->
275<div class="doc_subsection">
276<a name="orgchanges">LLVM Community Changes</a>
277</div>
278
279<div class="doc_text">
280
Chris Lattnerb3fa6bf2010-07-21 15:57:40 +0000[diff] [blame]281<p>In addition to changes to the code, between LLVM 2.7 and 2.8, a number of
Chris Lattner87e04952010-04-21 05:17:40 +0000[diff] [blame]282organization changes have happened:
283</p>
284
285<ul>
Chris Lattner87e04952010-04-21 05:17:40 +0000[diff] [blame]286</ul>
Chris Lattnerb7bc2aa2008-06-08 22:59:35 +0000[diff] [blame]287</div>
288
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]289<!--=========================================================================-->
Chris Lattner625a3d82008-06-08 21:34:41 +0000[diff] [blame]290<div class="doc_subsection">
Chris Lattnercdc44ed2008-02-06 18:00:06 +0000[diff] [blame]291<a name="majorfeatures">Major New Features</a>
292</div>
293
294<div class="doc_text">
295
Chris Lattnerb3fa6bf2010-07-21 15:57:40 +0000[diff] [blame]296<p>LLVM 2.8 includes several major new capabilities:</p>
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]297
298<ul>
Chris Lattnerb3fa6bf2010-07-21 15:57:40 +0000[diff] [blame]299<li>.</li>
Chris Lattner458e79f2008-02-10 08:18:42 +0000[diff] [blame]300</ul>
Chris Lattner10a3cc42010-03-17 06:41:58 +0000[diff] [blame]301
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]302</div>
303
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]304<!--=========================================================================-->
305<div class="doc_subsection">
Chris Lattnerd1094e02009-03-02 02:37:32 +0000[diff] [blame]306<a name="coreimprovements">LLVM IR and Core Improvements</a>
Chris Lattnerdd6acc02008-02-10 08:17:19 +0000[diff] [blame]307</div>
308
309<div class="doc_text">
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]310<p>LLVM IR has several new features for better support of new targets and that
311expose new optimization opportunities:</p>
Chris Lattnerdd6acc02008-02-10 08:17:19 +0000[diff] [blame]312
Chris Lattnerb7112222008-06-05 06:25:56 +0000[diff] [blame]313<ul>
Gabor Greif4b17e652010-07-21 10:20:08 +0000[diff] [blame]314
315<li>LLVM 2.8 changes the internal order of operands in <a
316 href="http://llvm.org/doxygen/classllvm_1_1InvokeInst.html"><tt>InvokeInst</tt></a>
317 and <a href="http://llvm.org/doxygen/classllvm_1_1CallInst.html"><tt>CallInst</tt></a>.
318 To be portable across releases, resort to <tt>CallSite</tt> and the
Gabor Greif930894f2010-07-21 10:22:41 +0000[diff] [blame]319 high-level accessors, such as <tt>getCalledValue</tt> and <tt>setUnwindDest</tt>.
Gabor Greif4b17e652010-07-21 10:20:08 +0000[diff] [blame]320</li>
Gabor Greifed79dcb2010-07-26 18:48:07 +0000[diff] [blame]321<li>
322 You can no longer pass use_iterators directly to cast<> (and similar), because
323 these routines tend to perform costly dereference operations more than once. You
324 have to dereference the iterators yourself and pass them in.
325</li>
Gabor Greif4b17e652010-07-21 10:20:08 +0000[diff] [blame]326
Chris Lattnerdd6acc02008-02-10 08:17:19 +0000[diff] [blame]327</ul>
Mikhail Glushenkov024f7cf2008-10-13 02:08:34 +0000[diff] [blame]328
Chris Lattnerdd6acc02008-02-10 08:17:19 +0000[diff] [blame]329</div>
330
331<!--=========================================================================-->
332<div class="doc_subsection">
Chris Lattner2b8a52e2008-02-10 07:46:44 +0000[diff] [blame]333<a name="optimizer">Optimizer Improvements</a>
334</div>
335
336<div class="doc_text">
337
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]338<p>In addition to a large array of minor performance tweaks and bug fixes, this
Chris Lattner25879d72008-10-13 21:50:36 +0000[diff] [blame]339release includes a few major enhancements and additions to the optimizers:</p>
Chris Lattner2b8a52e2008-02-10 07:46:44 +0000[diff] [blame]340
341<ul>
342
Chris Lattnerb3fa6bf2010-07-21 15:57:40 +0000[diff] [blame]343<li></li>
Chris Lattnera668b452010-04-21 06:42:24 +0000[diff] [blame]344
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]345</ul>
Chris Lattnerd1094e02009-03-02 02:37:32 +0000[diff] [blame]346
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]347</div>
Chris Lattnerd1094e02009-03-02 02:37:32 +0000[diff] [blame]348
Chris Lattnerd1094e02009-03-02 02:37:32 +0000[diff] [blame]349
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]350<!--=========================================================================-->
351<div class="doc_subsection">
352<a name="executionengine">Interpreter and JIT Improvements</a>
353</div>
Chris Lattner25879d72008-10-13 21:50:36 +0000[diff] [blame]354
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]355<div class="doc_text">
356
357<ul>
Chris Lattnerb3fa6bf2010-07-21 15:57:40 +0000[diff] [blame]358<li></li>
Chris Lattner87e04952010-04-21 05:17:40 +0000[diff] [blame]359
Chris Lattner7795ea92008-06-08 02:45:07 +0000[diff] [blame]360</ul>
361
362</div>
363
364<!--=========================================================================-->
365<div class="doc_subsection">
Chris Lattnerd434bfb2009-03-02 03:24:11 +0000[diff] [blame]366<a name="codegen">Target Independent Code Generator Improvements</a>
Chris Lattner7795ea92008-06-08 02:45:07 +0000[diff] [blame]367</div>
368
369<div class="doc_text">
370
Mikhail Glushenkov25422542009-03-01 18:09:47 +0000[diff] [blame]371<p>We have put a significant amount of work into the code generator
372infrastructure, which allows us to implement more aggressive algorithms and make
373it run faster:</p>
Chris Lattner7795ea92008-06-08 02:45:07 +0000[diff] [blame]374
375<ul>
Chris Lattnerb3fa6bf2010-07-21 15:57:40 +0000[diff] [blame]376<li>MachO writer works.</li>
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]377</ul>
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]378</div>
379
Chris Lattnerd1094e02009-03-02 02:37:32 +0000[diff] [blame]380<!--=========================================================================-->
381<div class="doc_subsection">
382<a name="x86">X86-32 and X86-64 Target Improvements</a>
383</div>
384
385<div class="doc_text">
386<p>New features of the X86 target include:
387</p>
388
389<ul>
Chris Lattnerb3fa6bf2010-07-21 15:57:40 +0000[diff] [blame]390<li>The X86 backend now supports holding X87 floating point stack values
391 in registers across basic blocks, dramatically improving performance of code
392 that uses long double, and when targetting CPUs that don't support SSE.</li>
Chris Lattnerd434bfb2009-03-02 03:24:11 +0000[diff] [blame]393
Chris Lattnerd1094e02009-03-02 02:37:32 +0000[diff] [blame]394</ul>
395
Chris Lattnerd1094e02009-03-02 02:37:32 +0000[diff] [blame]396</div>
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]397
398<!--=========================================================================-->
399<div class="doc_subsection">
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]400<a name="ARM">ARM Target Improvements</a>
Chris Lattnerc92d7692009-03-01 02:30:21 +0000[diff] [blame]401</div>
402
403<div class="doc_text">
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]404<p>New features of the ARM target include:
405</p>
Chris Lattnerc92d7692009-03-01 02:30:21 +0000[diff] [blame]406
407<ul>
Chris Lattnerc92d7692009-03-01 02:30:21 +0000[diff] [blame]408
Chris Lattnerb3fa6bf2010-07-21 15:57:40 +0000[diff] [blame]409<li></li>
Jim Grosbach96284682010-04-22 18:33:31 +0000[diff] [blame]410
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]411</ul>
Chris Lattnerc92d7692009-03-01 02:30:21 +0000[diff] [blame]412
Chris Lattnerc92d7692009-03-01 02:30:21 +0000[diff] [blame]413
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]414</div>
Chris Lattnerc92d7692009-03-01 02:30:21 +0000[diff] [blame]415
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]416<!--=========================================================================-->
417<div class="doc_subsection">
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]418<a name="newapis">New Useful APIs</a>
419</div>
420
421<div class="doc_text">
422
423<p>This release includes a number of new APIs that are used internally, which
424 may also be useful for external clients.
425</p>
426
427<ul>
Chris Lattnerb3fa6bf2010-07-21 15:57:40 +0000[diff] [blame]428<li></li>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]429</ul>
430
431
432</div>
433
434<!--=========================================================================-->
435<div class="doc_subsection">
436<a name="otherimprovements">Other Improvements and New Features</a>
437</div>
438
439<div class="doc_text">
440<p>Other miscellaneous features include:</p>
441
442<ul>
Chris Lattnerb3fa6bf2010-07-21 15:57:40 +0000[diff] [blame]443<li></li>
Chris Lattnerc92d7692009-03-01 02:30:21 +0000[diff] [blame]444</ul>
445
446</div>
447
Chris Lattner6cb64032008-06-05 08:02:49 +0000[diff] [blame]448
449<!--=========================================================================-->
450<div class="doc_subsection">
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]451<a name="changes">Major Changes and Removed Features</a>
452</div>
453
454<div class="doc_text">
455
Chris Lattner934e2d42008-10-13 22:06:31 +0000[diff] [blame]456<p>If you're already an LLVM user or developer with out-of-tree changes based
Chris Lattnerb3fa6bf2010-07-21 15:57:40 +0000[diff] [blame]457on LLVM 2.7, this section lists some "gotchas" that you may run into upgrading
Chris Lattner934e2d42008-10-13 22:06:31 +0000[diff] [blame]458from the previous release.</p>
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]459
460<ul>
Chris Lattner87e04952010-04-21 05:17:40 +0000[diff] [blame]461
Chris Lattnerb3fa6bf2010-07-21 15:57:40 +0000[diff] [blame]462<li>.</li>
Chris Lattner87e04952010-04-21 05:17:40 +0000[diff] [blame]463</ul>
Chris Lattner934e2d42008-10-13 22:06:31 +0000[diff] [blame]464
465<p>In addition, many APIs have changed in this release. Some of the major LLVM
466API changes are:</p>
467
468<ul>
Devang Pateldbf83832008-10-14 20:03:43 +0000[diff] [blame]469</ul>
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]470
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]471</div>
472
473
474
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]475<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]476<div class="doc_section">
477 <a name="portability">Portability and Supported Platforms</a>
478</div>
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]479<!-- *********************************************************************** -->
480
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]481<div class="doc_text">
482
John Criswell64307722004-12-08 20:35:47 +0000[diff] [blame]483<p>LLVM is known to work on the following platforms:</p>
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]484
485<ul>
Mikhail Glushenkov25422542009-03-01 18:09:47 +0000[diff] [blame]486<li>Intel and AMD machines (IA32, X86-64, AMD64, EMT-64) running Red Hat
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]487 Linux, Fedora Core, FreeBSD and AuroraUX (and probably other unix-like
488 systems).</li>
Chris Lattnera67df2d2010-04-22 06:28:20 +0000[diff] [blame]489<li>PowerPC and X86-based Mac OS X systems, running 10.4 and above in 32-bit
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]490 and 64-bit modes.</li>
Chris Lattnercdc44ed2008-02-06 18:00:06 +0000[diff] [blame]491<li>Intel and AMD machines running on Win32 using MinGW libraries (native).</li>
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]492<li>Intel and AMD machines running on Win32 with the Cygwin libraries (limited
493 support is available for native builds with Visual C++).</li>
Chris Lattner51948622009-10-16 16:30:58 +0000[diff] [blame]494<li>Sun x86 and AMD64 machines running Solaris 10, OpenSolaris 0906.</li>
John Criswelld5234922005-05-13 20:28:15 +0000[diff] [blame]495<li>Alpha-based machines running Debian GNU/Linux.</li>
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]496</ul>
497
Chris Lattner618a99f2008-06-05 06:57:39 +0000[diff] [blame]498<p>The core LLVM infrastructure uses GNU autoconf to adapt itself
Brian Gaekee3e557e2004-05-09 05:28:35 +0000[diff] [blame]499to the machine and operating system on which it is built. However, minor
500porting may be required to get LLVM to work on new platforms. We welcome your
501portability patches and reports of successful builds or error messages.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]502
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]503</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]504
505<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]506<div class="doc_section">
507 <a name="knownproblems">Known Problems</a>
508</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]509<!-- *********************************************************************** -->
510
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]511<div class="doc_text">
512
Mikhail Glushenkov25422542009-03-01 18:09:47 +0000[diff] [blame]513<p>This section contains significant known problems with the LLVM system,
Chris Lattner2a092392008-11-10 05:40:34 +0000[diff] [blame]514listed by component. If you run into a problem, please check the <a
Chris Lattnera69595e2005-10-29 07:07:09 +0000[diff] [blame]515href="http://llvm.org/bugs/">LLVM bug database</a> and submit a bug if
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]516there isn't already one.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]517
Chris Lattner6aba4862010-03-17 17:25:49 +0000[diff] [blame]518<ul>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]519<li>LLVM will not correctly compile on Solaris and/or OpenSolaris
520using the stock GCC 3.x.x series 'out the box',
Chris Lattner6e41c792009-11-03 21:50:09 +0000[diff] [blame]521See: <a href="GettingStarted.html#brokengcc">Broken versions of GCC and other tools</a>.
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]522However, A <a href="http://pkg.auroraux.org/GCC">Modern GCC Build</a>
523for x86/x86-64 has been made available from the third party AuroraUX Project
524that has been meticulously tested for bootstrapping LLVM &amp; Clang.</li>
525</ul>
526
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]527</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]528
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]529<!-- ======================================================================= -->
530<div class="doc_subsection">
531 <a name="experimental">Experimental features included with this release</a>
532</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]533
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]534<div class="doc_text">
535
Misha Brukmanfa50a222004-05-12 21:46:05 +0000[diff] [blame]536<p>The following components of this LLVM release are either untested, known to
537be broken or unreliable, or are in early development. These components should
538not be relied on, and bugs should not be filed against them, but they may be
539useful to some people. In particular, if you would like to work on one of these
Chris Lattnere38ac152008-02-12 06:29:45 +0000[diff] [blame]540components, please contact us on the <a
541href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVMdev list</a>.</p>
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]542
543<ul>
Wesley Peck3aa84e52010-03-18 14:31:30 +0000[diff] [blame]544<li>The MSIL, Alpha, SPU, MIPS, PIC16, Blackfin, MSP430, SystemZ and MicroBlaze
545 backends are experimental.</li>
Chris Lattnera67df2d2010-04-22 06:28:20 +0000[diff] [blame]546<li><tt>llc</tt> "<tt>-filetype=asm</tt>" (the default) is the only
Chris Lattnerb3fa6bf2010-07-21 15:57:40 +0000[diff] [blame]547 supported value for this option. XXX Update me</li>
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]548</ul>
549
550</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]551
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]552<!-- ======================================================================= -->
553<div class="doc_subsection">
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]554 <a name="x86-be">Known problems with the X86 back-end</a>
John Criswell3bdbd302005-11-08 21:11:33 +0000[diff] [blame]555</div>
556
557<div class="doc_text">
558
559<ul>
Anton Korobeynikov486c7d32008-06-08 10:24:13 +0000[diff] [blame]560 <li>The X86 backend does not yet support
561 all <a href="http://llvm.org/PR879">inline assembly that uses the X86
562 floating point stack</a>. It supports the 'f' and 't' constraints, but not
563 'u'.</li>
Duncan Sands0bc15262008-06-08 19:38:43 +0000[diff] [blame]564 <li>Win64 code generation wasn't widely tested. Everything should work, but we
John Criswellea03c9d2009-03-02 15:28:15 +0000[diff] [blame]565 expect small issues to happen. Also, llvm-gcc cannot build the mingw64
Chris Lattnera67df2d2010-04-22 06:28:20 +0000[diff] [blame]566 runtime currently due to lack of support for the 'u' inline assembly
567 constraint and for X87 floating point inline assembly.</li>
Dan Gohman721b3722008-06-08 23:05:11 +0000[diff] [blame]568 <li>The X86-64 backend does not yet support the LLVM IR instruction
Chris Lattnera67df2d2010-04-22 06:28:20 +0000[diff] [blame]569 <tt>va_arg</tt>. Currently, front-ends support variadic
Dan Gohman721b3722008-06-08 23:05:11 +0000[diff] [blame]570 argument constructs on X86-64 by lowering them manually.</li>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]571</ul>
572
573</div>
574
575<!-- ======================================================================= -->
576<div class="doc_subsection">
577 <a name="ppc-be">Known problems with the PowerPC back-end</a>
578</div>
579
580<div class="doc_text">
581
582<ul>
Nicolas Geoffray77d99502007-05-15 09:21:28 +0000[diff] [blame]583<li>The Linux PPC32/ABI support needs testing for the interpreter and static
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]584compilation, and lacks support for debug information.</li>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]585</ul>
586
587</div>
588
589<!-- ======================================================================= -->
590<div class="doc_subsection">
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]591 <a name="arm-be">Known problems with the ARM back-end</a>
592</div>
593
594<div class="doc_text">
595
596<ul>
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]597<li>Thumb mode works only on ARMv6 or higher processors. On sub-ARMv6
Duncan Sands47fc0a22007-09-26 15:59:54 +0000[diff] [blame]598processors, thumb programs can crash or produce wrong
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]599results (<a href="http://llvm.org/PR1388">PR1388</a>).</li>
John Criswellea03c9d2009-03-02 15:28:15 +0000[diff] [blame]600<li>Compilation for ARM Linux OABI (old ABI) is supported but not fully tested.
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]601</li>
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]602</ul>
603
604</div>
605
606<!-- ======================================================================= -->
607<div class="doc_subsection">
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]608 <a name="sparc-be">Known problems with the SPARC back-end</a>
609</div>
610
611<div class="doc_text">
612
613<ul>
John Criswellea03c9d2009-03-02 15:28:15 +0000[diff] [blame]614<li>The SPARC backend only supports the 32-bit SPARC ABI (-m32); it does not
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]615 support the 64-bit SPARC ABI (-m64).</li>
616</ul>
617
618</div>
619
620<!-- ======================================================================= -->
621<div class="doc_subsection">
Bruno Cardoso Lopes24eb3de2008-10-25 14:56:26 +0000[diff] [blame]622 <a name="mips-be">Known problems with the MIPS back-end</a>
623</div>
624
625<div class="doc_text">
626
627<ul>
Bruno Cardoso Lopes24eb3de2008-10-25 14:56:26 +0000[diff] [blame]628<li>64-bit MIPS targets are not supported yet.</li>
629</ul>
630
631</div>
632
633<!-- ======================================================================= -->
634<div class="doc_subsection">
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]635 <a name="alpha-be">Known problems with the Alpha back-end</a>
636</div>
637
638<div class="doc_text">
639
640<ul>
641
642<li>On 21164s, some rare FP arithmetic sequences which may trap do not have the
643appropriate nops inserted to ensure restartability.</li>
644
John Criswell3bdbd302005-11-08 21:11:33 +0000[diff] [blame]645</ul>
646</div>
647
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]648<!-- ======================================================================= -->
649<div class="doc_subsection">
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]650 <a name="c-be">Known problems with the C back-end</a>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]651</div>
652
653<div class="doc_text">
654
655<ul>
Chris Lattnera1a4c9a2008-06-05 06:35:40 +0000[diff] [blame]656<li><a href="http://llvm.org/PR802">The C backend has only basic support for
657 inline assembly code</a>.</li>
Chris Lattner8e061162007-09-26 06:01:35 +0000[diff] [blame]658<li><a href="http://llvm.org/PR1658">The C backend violates the ABI of common
659 C++ programs</a>, preventing intermixing between C++ compiled by the CBE and
Gabor Greif75b2f762009-03-02 12:02:51 +0000[diff] [blame]660 C++ code compiled with <tt>llc</tt> or native compilers.</li>
Duncan Sandse09506a2008-02-10 13:40:55 +0000[diff] [blame]661<li>The C backend does not support all exception handling constructs.</li>
Duncan Sands3aa36732009-02-25 11:51:54 +0000[diff] [blame]662<li>The C backend does not support arbitrary precision integers.</li>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]663</ul>
664
665</div>
John Criswell3bdbd302005-11-08 21:11:33 +0000[diff] [blame]666
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]667
668<!-- ======================================================================= -->
669<div class="doc_subsection">
Chris Lattner0b1c9a52010-03-17 04:41:49 +0000[diff] [blame]670 <a name="c-fe">Known problems with the llvm-gcc C and C++ front-end</a>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]671</div>
Chris Lattner178f3db2003-10-02 05:07:23 +0000[diff] [blame]672
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]673<div class="doc_text">
Chris Lattner72a269f2006-03-03 00:34:26 +0000[diff] [blame]674
Chris Lattnera1a4c9a2008-06-05 06:35:40 +0000[diff] [blame]675<p>The only major language feature of GCC not supported by llvm-gcc is
676 the <tt>__builtin_apply</tt> family of builtins. However, some extensions
677 are only supported on some targets. For example, trampolines are only
Duncan Sands56448462008-06-08 20:18:35 +0000[diff] [blame]678 supported on some targets (these are used when you take the address of a
679 nested function).</p>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]680
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]681</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]682
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]683<!-- ======================================================================= -->
684<div class="doc_subsection">
Chris Lattner7292fb12008-10-30 03:58:13 +0000[diff] [blame]685 <a name="fortran-fe">Known problems with the llvm-gcc Fortran front-end</a>
686</div>
687
688<div class="doc_text">
Gabor Greife5f9d672008-11-04 21:50:59 +0000[diff] [blame]689<ul>
Chris Lattner7292fb12008-10-30 03:58:13 +0000[diff] [blame]690<li>Fortran support generally works, but there are still several unresolved bugs
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]691 in <a href="http://llvm.org/bugs/">Bugzilla</a>. Please see the
692 tools/gfortran component for details.</li>
Gabor Greife5f9d672008-11-04 21:50:59 +0000[diff] [blame]693</ul>
Chris Lattner7292fb12008-10-30 03:58:13 +0000[diff] [blame]694</div>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]695
Chris Lattnere38ac152008-02-12 06:29:45 +0000[diff] [blame]696<!-- ======================================================================= -->
697<div class="doc_subsection">
Chris Lattnera1a4c9a2008-06-05 06:35:40 +0000[diff] [blame]698 <a name="ada-fe">Known problems with the llvm-gcc Ada front-end</a>
Chris Lattnere38ac152008-02-12 06:29:45 +0000[diff] [blame]699</div>
700
701<div class="doc_text">
John Criswellea03c9d2009-03-02 15:28:15 +0000[diff] [blame]702The llvm-gcc 4.2 Ada compiler works fairly well; however, this is not a mature
703technology, and problems should be expected.
Chris Lattnere38ac152008-02-12 06:29:45 +0000[diff] [blame]704<ul>
Duncan Sands56448462008-06-08 20:18:35 +0000[diff] [blame]705<li>The Ada front-end currently only builds on X86-32. This is mainly due
John Criswellea03c9d2009-03-02 15:28:15 +0000[diff] [blame]706to lack of trampoline support (pointers to nested functions) on other platforms.
707However, it <a href="http://llvm.org/PR2006">also fails to build on X86-64</a>
Chris Lattnere38ac152008-02-12 06:29:45 +0000[diff] [blame]708which does support trampolines.</li>
709<li>The Ada front-end <a href="http://llvm.org/PR2007">fails to bootstrap</a>.
Duncan Sandsd34bf762009-02-25 11:59:06 +0000[diff] [blame]710This is due to lack of LLVM support for <tt>setjmp</tt>/<tt>longjmp</tt> style
711exception handling, which is used internally by the compiler.
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]712Workaround: configure with <tt>--disable-bootstrap</tt>.</li>
Duncan Sandsaef747f2008-10-13 17:27:23 +0000[diff] [blame]713<li>The c380004, <a href="http://llvm.org/PR2010">c393010</a>
714and <a href="http://llvm.org/PR2421">cxg2021</a> ACATS tests fail
Duncan Sandsd34bf762009-02-25 11:59:06 +0000[diff] [blame]715(c380004 also fails with gcc-4.2 mainline).
716If the compiler is built with checks disabled then <a href="http://llvm.org/PR2010">c393010</a>
717causes the compiler to go into an infinite loop, using up all system memory.</li>
Duncan Sands2dbb00e2009-03-02 16:35:57 +0000[diff] [blame]718<li>Some GCC specific Ada tests continue to crash the compiler.</li>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]719<li>The <tt>-E</tt> binder option (exception backtraces)
Chris Lattnere38ac152008-02-12 06:29:45 +0000[diff] [blame]720<a href="http://llvm.org/PR1982">does not work</a> and will result in programs
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]721crashing if an exception is raised. Workaround: do not use <tt>-E</tt>.</li>
Chris Lattnere38ac152008-02-12 06:29:45 +0000[diff] [blame]722<li>Only discrete types <a href="http://llvm.org/PR1981">are allowed to start
723or finish at a non-byte offset</a> in a record. Workaround: do not pack records
724or use representation clauses that result in a field of a non-discrete type
725starting or finishing in the middle of a byte.</li>
Chris Lattnerb076b002008-06-08 21:19:07 +0000[diff] [blame]726<li>The <tt>lli</tt> interpreter <a href="http://llvm.org/PR2009">considers
727'main' as generated by the Ada binder to be invalid</a>.
728Workaround: hand edit the file to use pointers for <tt>argv</tt> and
729<tt>envp</tt> rather than integers.</li>
730<li>The <tt>-fstack-check</tt> option <a href="http://llvm.org/PR2008">is
731ignored</a>.</li>
Chris Lattnere38ac152008-02-12 06:29:45 +0000[diff] [blame]732</ul>
733</div>
734
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]735<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]736<div class="doc_section">
737 <a name="additionalinfo">Additional Information</a>
738</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]739<!-- *********************************************************************** -->
740
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]741<div class="doc_text">
742
Chris Lattnercb5596d2005-05-16 17:13:10 +0000[diff] [blame]743<p>A wide variety of additional information is available on the <a
Chris Lattnere0c1df42007-05-18 00:44:29 +0000[diff] [blame]744href="http://llvm.org">LLVM web page</a>, in particular in the <a
745href="http://llvm.org/docs/">documentation</a> section. The web page also
Reid Spencerc7f87f22007-07-09 08:04:31 +0000[diff] [blame]746contains versions of the API documentation which is up-to-date with the
747Subversion version of the source code.
Misha Brukman96158092005-03-30 19:14:24 +0000[diff] [blame]748You can access versions of these documents specific to this release by going
749into the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]750
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]751<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]752us via the <a href="http://llvm.org/docs/#maillist"> mailing
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]753lists</a>.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]754
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]755</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]756
757<!-- *********************************************************************** -->
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]758
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]759<hr>
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]760<address>
Misha Brukman8834af92003-12-21 22:53:21 +0000[diff] [blame]761 <a href="http://jigsaw.w3.org/css-validator/check/referer"><img
Misha Brukman86242e12008-12-11 17:34:48 +0000[diff] [blame]762 src="http://jigsaw.w3.org/css-validator/images/vcss-blue" alt="Valid CSS"></a>
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]763 <a href="http://validator.w3.org/check/referer"><img
Misha Brukman86242e12008-12-11 17:34:48 +0000[diff] [blame]764 src="http://www.w3.org/Icons/valid-html401-blue" alt="Valid HTML 4.01"></a>
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]765
Chris Lattnere0c1df42007-05-18 00:44:29 +0000[diff] [blame]766 <a href="http://llvm.org/">LLVM Compiler Infrastructure</a><br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]767 Last modified: $Date$
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]768</address>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]769
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]770</body>
771</html>