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gerrit-public.fairphone.software / toolchain / llvm-project / 7354ec4303856a957cb7b261a5e5226461fdddd7 / . / llvm / docs / ReleaseNotes.html
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Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]1<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
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3<html>
4<head>
Reid Spencere4190fa2004-11-18 18:38:58 +0000[diff] [blame]5 <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]6 <link rel="stylesheet" href="llvm.css" type="text/css">
Chris Lattner7fad44b2009-02-25 04:41:31 +0000[diff] [blame]7 <title>LLVM 2.5 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 Lattner7fad44b2009-02-25 04:41:31 +0000[diff] [blame]11<div class="doc_title">LLVM 2.5 Release Notes</div>
Mikhail Glushenkov024f7cf2008-10-13 02:08:34 +0000[diff] [blame]12
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]13<ol>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]14 <li><a href="#intro">Introduction</a></li>
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]15 <li><a href="#subproj">Sub-project Status Update</a></li>
16 <li><a href="#whatsnew">What's New in LLVM?</a></li>
Chris Lattner77a51732004-04-30 22:17:12 +0000[diff] [blame]17 <li><a href="GettingStarted.html">Installation Instructions</a></li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]18 <li><a href="#portability">Portability and Supported Platforms</a></li>
Dan Gohmanad888912008-10-14 16:23:02 +0000[diff] [blame]19 <li><a href="#knownproblems">Known Problems</a></li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]20 <li><a href="#additionalinfo">Additional Information</a></li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]21</ol>
22
Chris Lattner020e1fc2004-05-23 21:07:27 +0000[diff] [blame]23<div class="doc_author">
Dan Gohmanad888912008-10-14 16:23:02 +0000[diff] [blame]24 <p>Written by the <a href="http://llvm.org">LLVM Team</a></p>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]25</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]26
27<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]28<div class="doc_section">
29 <a name="intro">Introduction</a>
30</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]31<!-- *********************************************************************** -->
32
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]33<div class="doc_text">
34
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]35<p>This document contains the release notes for the LLVM Compiler
Chris Lattner7fad44b2009-02-25 04:41:31 +0000[diff] [blame]36Infrastructure, release 2.5. Here we describe the status of LLVM, including
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]37major improvements from the previous release and significant known problems.
38All LLVM releases may be downloaded from the <a
39href="http://llvm.org/releases/">LLVM releases web site</a>.</p>
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]40
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]41<p>For more information about LLVM, including information about the latest
Chris Lattnera69595e2005-10-29 07:07:09 +0000[diff] [blame]42release, please check out the <a href="http://llvm.org/">main LLVM
Chris Lattnere7525b52003-10-07 21:38:31 +0000[diff] [blame]43web site</a>. If you have questions or comments, the <a
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]44href="http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVM Developer's Mailing
45List</a> is a good place to send them.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]46
Mikhail Glushenkov024f7cf2008-10-13 02:08:34 +0000[diff] [blame]47<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]48main LLVM web page, this document applies to the <i>next</i> release, not the
Gabor Greif355f81c2008-10-14 11:00:32 +0000[diff] [blame]49current one. To see the release notes for a specific release, please see the
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]50<a href="http://llvm.org/releases/">releases page</a>.</p>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]51
52</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]53
Chris Lattner7fad44b2009-02-25 04:41:31 +0000[diff] [blame]54<!-- Unfinished features in 2.5:
Chris Lattner2b8a52e2008-02-10 07:46:44 +0000[diff] [blame]55 Machine LICM
56 Machine Sinking
Chris Lattnerd02da042009-02-25 06:34:50 +0000[diff] [blame]57 target-specific intrinsics
58 gold lto plugin
Chris Lattner3ab27b72009-02-25 07:32:53 +0000[diff] [blame]59 pre-alloc splitter, strong phi elim
Chris Lattnerc4d68542008-10-12 19:47:48 +0000[diff] [blame]60 llc -enable-value-prop, propagation of value info (sign/zero ext info) from
61 one MBB to another
Chris Lattnerd02da042009-02-25 06:34:50 +0000[diff] [blame]62 debug info for optimized code
Chris Lattner3ab27b72009-02-25 07:32:53 +0000[diff] [blame]63
Chris Lattner2b8a52e2008-02-10 07:46:44 +0000[diff] [blame]64 -->
Mikhail Glushenkov024f7cf2008-10-13 02:08:34 +0000[diff] [blame]65
Chris Lattnerc4d68542008-10-12 19:47:48 +0000[diff] [blame]66 <!-- for announcement email:
Chris Lattnerd02da042009-02-25 06:34:50 +0000[diff] [blame]67 -->
Chris Lattner2b8a52e2008-02-10 07:46:44 +0000[diff] [blame]68
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]69<!-- *********************************************************************** -->
70<div class="doc_section">
71 <a name="subproj">Sub-project Status Update</a>
Chris Lattner625a3d82008-06-08 21:34:41 +0000[diff] [blame]72</div>
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]73<!-- *********************************************************************** -->
Chris Lattner625a3d82008-06-08 21:34:41 +0000[diff] [blame]74
75<div class="doc_text">
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]76<p>
Chris Lattner7fad44b2009-02-25 04:41:31 +0000[diff] [blame]77The LLVM 2.5 distribution currently consists of code from the core LLVM
Chris Lattner44c09cd2008-10-13 18:11:54 +0000[diff] [blame]78repository (which roughly includes the LLVM optimizers, code generators and
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]79supporting tools) and the llvm-gcc repository. In addition to this code, the
80LLVM Project includes other sub-projects that are in development. The two which
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]81are the most actively developed are the <a href="#clang">Clang Project</a> and
Nicolas Geoffraye5ec9322008-10-14 19:23:04 +0000[diff] [blame]82the <a href="#vmkit">VMKit Project</a>.
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]83</p>
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]84
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]85</div>
86
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]87
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]88<!--=========================================================================-->
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]89<div class="doc_subsection">
Chris Lattner44c09cd2008-10-13 18:11:54 +0000[diff] [blame]90<a name="clang">Clang: C/C++/Objective-C Frontend Toolkit</a>
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]91</div>
92
93<div class="doc_text">
94
95<p>The <a href="http://clang.llvm.org/">Clang project</a> is an effort to build
96a set of new 'LLVM native' front-end technologies for the LLVM optimizer
Chris Lattnerf70a0242009-02-25 05:09:54 +0000[diff] [blame]97and code generator. While Clang is not included in the LLVM 2.5 release, it
98is continuing to make major strides forward in all areas. Its C and Objective-C
99parsing and code generation support is now very solid. For example, it is
100capable of successfully building many real applications for X86-32 and X86-64,
101including the FreeBSD kernel. C++ is also making <a
102href="http://clang.llvm.org/cxx_status.html">incredible progress</a>, and work
103on templates has recently started.</p>
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]104
Chris Lattnerf70a0242009-02-25 05:09:54 +0000[diff] [blame]105<p>While Clang is not yet production quality, it is progressing very nicely and
106is quite usable for building many C and Objective-C applications. If you are
107interested in fast compiles and good diagnostics, we encourage you to try it out
Chris Lattnerd02da042009-02-25 06:34:50 +0000[diff] [blame]108by <a href="http://clang.llvm.org/get_started.html">building from mainline</a>
Chris Lattnerf70a0242009-02-25 05:09:54 +0000[diff] [blame]109and reporting any issues you hit to the <a
110href="http://lists.cs.uiuc.edu/mailman/listinfo/cfe-dev">Clang front-end mailing
111list</a>.</p>
112
113<p>In the LLVM 2.5 time-frame, the Clang team has made many improvements:</p>
Bill Wendlingef362462008-10-27 09:27:33 +0000[diff] [blame]114
Daniel Dunbarc11b40f2008-10-14 23:25:09 +0000[diff] [blame]115<ul>
Chris Lattnerf70a0242009-02-25 05:09:54 +0000[diff] [blame]116<li>Clang now has a new driver, which is focused on providing a GCC-compatible
117 interface.</li>
118<li>The X86-64 ABI is now supported.</li>
119<li>Precompiled header support is now implemented.</li>
120<li>Objective-C support is significantly improved beyond LLVM 2.4, supporting
121 many features, such as Objective-C Garbage Collection.</li>
122<li>Many many bugs are fixed.</li>
Chris Lattner44c09cd2008-10-13 18:11:54 +0000[diff] [blame]123</div>
124
125<!--=========================================================================-->
126<div class="doc_subsection">
127<a name="clangsa">Clang Static Analyzer</a>
128</div>
129
130<div class="doc_text">
131
Ted Kremenek3db01842008-10-14 05:14:21 +0000[diff] [blame]132<p>The Clang project also includes an early stage static source code analysis
133tool for <a href="http://clang.llvm.org/StaticAnalysis.html">automatically
134finding bugs</a> in C and Objective-C programs. The tool performs a growing set
Chris Lattner05972292008-10-14 06:02:29 +0000[diff] [blame]135of checks to find bugs that occur on a specific path within a program. Examples
Ted Kremenek3db01842008-10-14 05:14:21 +0000[diff] [blame]136of bugs the tool finds include logic errors such as null dereferences,
137violations of various API rules, dead code, and potential memory leaks in
Chris Lattner05972292008-10-14 06:02:29 +0000[diff] [blame]138Objective-C programs. Since its inception, public feedback on the tool has been
139extremely positive, and conservative estimates put the number of real bugs it
140has found in industrial-quality software on the order of thousands.</p>
Chris Lattnerbcffa5a2008-10-14 00:52:49 +0000[diff] [blame]141
Ted Kremenek3db01842008-10-14 05:14:21 +0000[diff] [blame]142<p>The tool also provides a simple web GUI to inspect potential bugs found by
Chris Lattner05972292008-10-14 06:02:29 +0000[diff] [blame]143the tool. While still early in development, the GUI illustrates some of the key
Ted Kremenek3db01842008-10-14 05:14:21 +0000[diff] [blame]144features of Clang: accurate source location information, which is used by the
145GUI to highlight specific code expressions that relate to a bug (including those
Bill Wendlingef362462008-10-27 09:27:33 +0000[diff] [blame]146that span multiple lines); and built-in knowledge of macros, which is used to
Ted Kremenek3db01842008-10-14 05:14:21 +0000[diff] [blame]147perform inline expansion of macros within the GUI itself.</p>
148
Chris Lattner05972292008-10-14 06:02:29 +0000[diff] [blame]149<p>The set of checks performed by the static analyzer is gradually expanding,
Bill Wendlingef362462008-10-27 09:27:33 +0000[diff] [blame]150and future plans for the tool include full source-level inter-procedural
151analysis and deeper checks such as buffer overrun detection. There are many
152opportunities to extend and enhance the static analyzer, and anyone interested
153in working on this project is encouraged to get involved!</p>
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]154
155</div>
156
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]157<!--=========================================================================-->
158<div class="doc_subsection">
Nicolas Geoffraye5ec9322008-10-14 19:23:04 +0000[diff] [blame]159<a name="vmkit">VMKit: JVM/CLI Virtual Machine Implementation</a>
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]160</div>
161
162<div class="doc_text">
163<p>
Nicolas Geoffraye5ec9322008-10-14 19:23:04 +0000[diff] [blame]164The <a href="http://vmkit.llvm.org/">VMKit project</a> is an implementation of
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]165a JVM and a CLI Virtual Machines (Microsoft .NET is an
166implementation of the CLI) using the Just-In-Time compiler of LLVM.</p>
167
Chris Lattnerb39faaa2009-02-25 05:45:05 +0000[diff] [blame]168<p>Following LLVM 2.5, VMKit has its first release ? that you can find on its
Nicolas Geoffray54efd492008-10-15 20:25:04 +0000[diff] [blame]169<a href="http://vmkit.llvm.org/releases/">webpage</a>. The release includes
170bug fixes, cleanup and new features. The major changes are:</p>
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]171
Nicolas Geoffraye5ec9322008-10-14 19:23:04 +0000[diff] [blame]172<ul>
173
Chris Lattnerd38d5e82009-02-26 05:20:36 +0000[diff] [blame]174<li>Ahead of Time compiler: compiles .class files to llvm .bc. VMKit uses this
175functionality to native compile the standard classes (eg java.lang.String).
176Users can compile AOT .class files into dynamic libraries and run them with the
177help of VMKit.</li>
178
179<li>New exception model: the dwarf exception model is very slow for
180exception-intensive applications, so the JVM has had a new implementation of
181exceptions which check at each function call if an exception happened. There is
182a low performance penalty on applications without exceptions, but it is a big
183gain for exception-intensive applications. For example the jack benchmark in
184Spec JVM98 is 6x faster (performance gain of 83%).</li>
185
186<li>New support for OSX/X64, Linux/X64 (with the Boehm GC), Linux/ppc32.</li>
Nicolas Geoffraye5ec9322008-10-14 19:23:04 +0000[diff] [blame]187
188</ul>
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]189</div>
190
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]191
192<!-- *********************************************************************** -->
193<div class="doc_section">
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]194 <a name="whatsnew">What's New in LLVM?</a>
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]195</div>
196<!-- *********************************************************************** -->
197
Chris Lattnerb7bc2aa2008-06-08 22:59:35 +0000[diff] [blame]198<div class="doc_text">
199
Bill Wendlingef362462008-10-27 09:27:33 +0000[diff] [blame]200<p>This release includes a huge number of bug fixes, performance tweaks, and
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]201minor improvements. Some of the major improvements and new features are listed
202in this section.
Chris Lattnerb7bc2aa2008-06-08 22:59:35 +0000[diff] [blame]203</p>
204</div>
205
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]206<!--=========================================================================-->
Chris Lattner625a3d82008-06-08 21:34:41 +0000[diff] [blame]207<div class="doc_subsection">
Chris Lattnercdc44ed2008-02-06 18:00:06 +0000[diff] [blame]208<a name="majorfeatures">Major New Features</a>
209</div>
210
211<div class="doc_text">
212
Chris Lattner7fad44b2009-02-25 04:41:31 +0000[diff] [blame]213<p>LLVM 2.5 includes several major new capabilities:</p>
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]214
215<ul>
Duncan Sandsd9c35572009-02-25 11:37:39 +0000[diff] [blame]216<li><p>The code generator now supports arbitrary precision integers.
217Types like <tt>i33</tt> have long been valid in the LLVM IR, but previously
218could only be used with the interpreter.
219Now IR using such types can be compiled to native code on all targets.
220All operations are supported if the integer is not bigger than twice the
221target machine word size.
222Simple operations like loads, stores and shifts by a constant amount are
223supported for integers of any size.
224</p></li>
Chris Lattnerd02da042009-02-25 06:34:50 +0000[diff] [blame]225
226<!--
227Random stuff:
228
Chris Lattner3ab27b72009-02-25 07:32:53 +0000[diff] [blame]229xcore backend!
230fortran on darwin!
231
Chris Lattnerd02da042009-02-25 06:34:50 +0000[diff] [blame]232.ll parser rewrite.
Chris Lattner7354ec42009-02-26 06:47:09 +0000[diff] [blame^]233GCC inliner off, llvm handles always-inline.
Chris Lattnerd02da042009-02-25 06:34:50 +0000[diff] [blame]234cmake mature?
235x86 backend FS/GS segment address spaces?
236nocapture
Chris Lattner7354ec42009-02-26 06:47:09 +0000[diff] [blame^]237memdep (used by GVN and memcpyopt) is faster / more aggressive.
Chris Lattner3ab27b72009-02-25 07:32:53 +0000[diff] [blame]238how to write a backend doc docs/WritingAnLLVMBackend.html
Chris Lattnerd02da042009-02-25 06:34:50 +0000[diff] [blame]239fastisel + exception handling
240vector widening <3 x float> -> <4 x float>
Chris Lattner3ab27b72009-02-25 07:32:53 +0000[diff] [blame]241arm port improvements? arm jit encoding stuff, constant island support?
Chris Lattnerd38d5e82009-02-26 05:20:36 +0000[diff] [blame]242JIT TLS support on x86-32.
Chris Lattner3ab27b72009-02-25 07:32:53 +0000[diff] [blame]243mem2reg now faster on code with huge basic blocks
244stack protectors/stack canaries, -fstack-protector, controllable on a
245 per-function basis with attributes.
246shufflevector is generalized to allow different shuffle mask width than its
247 input vectors.
248loop optimizer improves floating point induction variables
249llvm/Analysis/DebugInfo.h classes, llvm-gcc and clang and codegen use them.
250asmprinters seperate from targets for jits
Chris Lattnerd38d5e82009-02-26 05:20:36 +0000[diff] [blame]251PBQP register allocator now supports register coalescing.
Chris Lattner7354ec42009-02-26 06:47:09 +0000[diff] [blame^]252JIT supports exceptions on linux/x86-64.
253integer overflow intrinsics for [us](add/sub/mul). Supported on all targets,
254 but only generates efficient code on x86.
255X86 backend now supports -disable-mmx.
256noalias attribute on return value indicates that function returns new memory
257 (e.g. malloc).
258postalloc scheduler: anti dependence breaking?
259llvmc2 renamed to llvmc
260Jump threading more powerful: it is iterative, handles threading based on values
261 with fully redundant and partially redundant loads.
262LSR improvements?
263ARM debug info support?
264unit test framework based on Google Test.
265
266vector shift support + X86 backend.
Chris Lattnerd38d5e82009-02-26 05:20:36 +0000[diff] [blame]267
Chris Lattnerd02da042009-02-25 06:34:50 +0000[diff] [blame]268-->
Chris Lattner618a99f2008-06-05 06:57:39 +0000[diff] [blame]269
Chris Lattner458e79f2008-02-10 08:18:42 +0000[diff] [blame]270</ul>
271
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]272</div>
273
Chris Lattnerb7112222008-06-05 06:25:56 +0000[diff] [blame]274
275<!--=========================================================================-->
276<div class="doc_subsection">
Chris Lattner625a3d82008-06-08 21:34:41 +0000[diff] [blame]277<a name="llvm-gcc">llvm-gcc 4.2 Improvements</a>
Chris Lattnerb7112222008-06-05 06:25:56 +0000[diff] [blame]278</div>
279
280<div class="doc_text">
281
Chris Lattner591ef272008-10-13 20:47:20 +0000[diff] [blame]282<p>LLVM fully supports the llvm-gcc 4.2 front-end, which marries the GCC
283front-ends and driver with the LLVM optimizer and code generator. It currently
284includes support for the C, C++, Objective-C, Ada, and Fortran front-ends.</p>
Chris Lattnerb7112222008-06-05 06:25:56 +0000[diff] [blame]285
Chris Lattnerb7bc2aa2008-06-08 22:59:35 +0000[diff] [blame]286<ul>
Chris Lattner7fad44b2009-02-25 04:41:31 +0000[diff] [blame]287<li>?</li>
Gabor Greif7f39fb52008-06-09 06:06:18 +0000[diff] [blame]288</ul>
Chris Lattnerb7112222008-06-05 06:25:56 +0000[diff] [blame]289
Chris Lattnerb7112222008-06-05 06:25:56 +0000[diff] [blame]290</div>
291
292
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]293<!--=========================================================================-->
294<div class="doc_subsection">
Chris Lattnerdd6acc02008-02-10 08:17:19 +0000[diff] [blame]295<a name="coreimprovements">LLVM Core Improvements</a>
296</div>
297
298<div class="doc_text">
Bill Wendlingef362462008-10-27 09:27:33 +0000[diff] [blame]299<p>New features include:</p>
Chris Lattnerdd6acc02008-02-10 08:17:19 +0000[diff] [blame]300
Chris Lattnerb7112222008-06-05 06:25:56 +0000[diff] [blame]301<ul>
Chris Lattner7fad44b2009-02-25 04:41:31 +0000[diff] [blame]302<li>?</li>
Chris Lattner0327f0b2008-10-13 20:59:32 +0000[diff] [blame]303
Chris Lattnerdd6acc02008-02-10 08:17:19 +0000[diff] [blame]304</ul>
Mikhail Glushenkov024f7cf2008-10-13 02:08:34 +0000[diff] [blame]305
Chris Lattnerdd6acc02008-02-10 08:17:19 +0000[diff] [blame]306</div>
307
308<!--=========================================================================-->
309<div class="doc_subsection">
Chris Lattner2b8a52e2008-02-10 07:46:44 +0000[diff] [blame]310<a name="optimizer">Optimizer Improvements</a>
311</div>
312
313<div class="doc_text">
314
Chris Lattner25879d72008-10-13 21:50:36 +0000[diff] [blame]315<p>In addition to a huge array of bug fixes and minor performance tweaks, this
316release includes a few major enhancements and additions to the optimizers:</p>
Chris Lattner2b8a52e2008-02-10 07:46:44 +0000[diff] [blame]317
318<ul>
319
Chris Lattner7fad44b2009-02-25 04:41:31 +0000[diff] [blame]320<li>?</li>
Chris Lattner25879d72008-10-13 21:50:36 +0000[diff] [blame]321
Chris Lattner7795ea92008-06-08 02:45:07 +0000[diff] [blame]322</ul>
323
324</div>
325
326<!--=========================================================================-->
327<div class="doc_subsection">
328<a name="codegen">Code Generator Improvements</a>
329</div>
330
331<div class="doc_text">
332
Gabor Greif20564a02008-10-14 11:31:14 +0000[diff] [blame]333<p>We have put a significant amount of work into the code generator infrastructure,
Chris Lattner7795ea92008-06-08 02:45:07 +0000[diff] [blame]334which allows us to implement more aggressive algorithms and make it run
335faster:</p>
336
337<ul>
Duncan Sands966fd262009-02-25 11:50:08 +0000[diff] [blame]338<li>The type legalization logic has been completely rewritten, and is now
339more powerful (it supports arbitrary precision integer types for example)
340and hopefully more correct.
341The type legalizer converts operations on types that are not natively
342supported by the target machine into equivalent code sequences that only use
343natively supported types.
344The old type legalizer is still available and will be used if
345<tt>-disable-legalize-types</tt> is passed to <tt>llc</tt>.
346</li>
Chris Lattner7fad44b2009-02-25 04:41:31 +0000[diff] [blame]347<li>?</li>
Chris Lattner7795ea92008-06-08 02:45:07 +0000[diff] [blame]348
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]349</ul>
350
351</div>
352
353
354<!--=========================================================================-->
355<div class="doc_subsection">
Chris Lattner934e2d42008-10-13 22:06:31 +0000[diff] [blame]356<a name="targetspecific">Target Specific Improvements</a>
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]357</div>
Chris Lattner727c3742007-05-18 06:33:02 +0000[diff] [blame]358
Chris Lattner89e761c2006-04-18 06:32:08 +0000[diff] [blame]359<div class="doc_text">
Chris Lattnerdd6acc02008-02-10 08:17:19 +0000[diff] [blame]360<p>New target-specific features include:
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]361</p>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]362
363<ul>
Chris Lattner7fad44b2009-02-25 04:41:31 +0000[diff] [blame]364<li>?</li>
Chris Lattner6cb64032008-06-05 08:02:49 +0000[diff] [blame]365</ul>
Chris Lattner6cb64032008-06-05 08:02:49 +0000[diff] [blame]366
Mikhail Glushenkov024f7cf2008-10-13 02:08:34 +0000[diff] [blame]367</div>
Chris Lattner6cb64032008-06-05 08:02:49 +0000[diff] [blame]368
369
370<!--=========================================================================-->
371<div class="doc_subsection">
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]372<a name="otherimprovements">Other Improvements</a>
373</div>
374
375<div class="doc_text">
376<p>New features include:
377</p>
378
379<ul>
Chris Lattner7fad44b2009-02-25 04:41:31 +0000[diff] [blame]380<li>?</li>
Tanya Lattner81edfc12008-11-04 18:40:27 +0000[diff] [blame]381
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]382</ul>
Mikhail Glushenkov024f7cf2008-10-13 02:08:34 +0000[diff] [blame]383
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]384</div>
Chris Lattner72a269f2006-03-03 00:34:26 +0000[diff] [blame]385
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]386<!--=========================================================================-->
387<div class="doc_subsection">
388<a name="changes">Major Changes and Removed Features</a>
389</div>
390
391<div class="doc_text">
392
Chris Lattner934e2d42008-10-13 22:06:31 +0000[diff] [blame]393<p>If you're already an LLVM user or developer with out-of-tree changes based
Chris Lattner7fad44b2009-02-25 04:41:31 +0000[diff] [blame]394on LLVM 2.4, this section lists some "gotchas" that you may run into upgrading
Chris Lattner934e2d42008-10-13 22:06:31 +0000[diff] [blame]395from the previous release.</p>
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]396
397<ul>
398
Chris Lattner7fad44b2009-02-25 04:41:31 +0000[diff] [blame]399<li>?</li>
Chris Lattner934e2d42008-10-13 22:06:31 +0000[diff] [blame]400</ul>
401
402
403<p>In addition, many APIs have changed in this release. Some of the major LLVM
404API changes are:</p>
405
406<ul>
Chris Lattner7fad44b2009-02-25 04:41:31 +0000[diff] [blame]407<li>?</li>
Devang Pateldbf83832008-10-14 20:03:43 +0000[diff] [blame]408</ul>
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]409
Chris Lattner7fad44b2009-02-25 04:41:31 +0000[diff] [blame]410<li>?</li>
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]411</ul>
412
413</div>
414
415
416
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]417<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]418<div class="doc_section">
419 <a name="portability">Portability and Supported Platforms</a>
420</div>
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]421<!-- *********************************************************************** -->
422
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]423<div class="doc_text">
424
John Criswell64307722004-12-08 20:35:47 +0000[diff] [blame]425<p>LLVM is known to work on the following platforms:</p>
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]426
427<ul>
Chris Lattner2a092392008-11-10 05:40:34 +0000[diff] [blame]428<li>Intel and AMD machines (IA32, X86-64, AMD64, EMT-64) running Red Hat
429Linux, Fedora Core and FreeBSD (and probably other unix-like systems).</li>
430<li>PowerPC and X86-based Mac OS X systems, running 10.3 and above in 32-bit
431and 64-bit modes.</li>
Chris Lattnercdc44ed2008-02-06 18:00:06 +0000[diff] [blame]432<li>Intel and AMD machines running on Win32 using MinGW libraries (native).</li>
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]433<li>Intel and AMD machines running on Win32 with the Cygwin libraries (limited
434 support is available for native builds with Visual C++).</li>
Gabor Greif80ae8a72008-06-05 18:39:01 +0000[diff] [blame]435<li>Sun UltraSPARC workstations running Solaris 10.</li>
John Criswelld5234922005-05-13 20:28:15 +0000[diff] [blame]436<li>Alpha-based machines running Debian GNU/Linux.</li>
Gabor Greif80ae8a72008-06-05 18:39:01 +0000[diff] [blame]437<li>Itanium-based (IA64) machines running Linux and HP-UX.</li>
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]438</ul>
439
Chris Lattner618a99f2008-06-05 06:57:39 +0000[diff] [blame]440<p>The core LLVM infrastructure uses GNU autoconf to adapt itself
Brian Gaekee3e557e2004-05-09 05:28:35 +0000[diff] [blame]441to the machine and operating system on which it is built. However, minor
442porting may be required to get LLVM to work on new platforms. We welcome your
443portability patches and reports of successful builds or error messages.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]444
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]445</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]446
447<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]448<div class="doc_section">
449 <a name="knownproblems">Known Problems</a>
450</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]451<!-- *********************************************************************** -->
452
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]453<div class="doc_text">
454
Chris Lattner2a092392008-11-10 05:40:34 +0000[diff] [blame]455<p>This section contains significant known problems with the LLVM system,
456listed by component. If you run into a problem, please check the <a
Chris Lattnera69595e2005-10-29 07:07:09 +0000[diff] [blame]457href="http://llvm.org/bugs/">LLVM bug database</a> and submit a bug if
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]458there isn't already one.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]459
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]460</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]461
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]462<!-- ======================================================================= -->
463<div class="doc_subsection">
464 <a name="experimental">Experimental features included with this release</a>
465</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]466
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]467<div class="doc_text">
468
Misha Brukmanfa50a222004-05-12 21:46:05 +0000[diff] [blame]469<p>The following components of this LLVM release are either untested, known to
470be broken or unreliable, or are in early development. These components should
471not be relied on, and bugs should not be filed against them, but they may be
472useful 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]473components, please contact us on the <a
474href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVMdev list</a>.</p>
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]475
476<ul>
Gabor Greif20564a02008-10-14 11:31:14 +0000[diff] [blame]477<li>The MSIL, IA64, Alpha, SPU, MIPS, and PIC16 backends are experimental.</li>
Duncan Sands56448462008-06-08 20:18:35 +0000[diff] [blame]478<li>The llc "<tt>-filetype=asm</tt>" (the default) is the only supported
Chris Lattner7422bce2008-02-06 06:30:34 +0000[diff] [blame]479 value for this option.</li>
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]480</ul>
481
482</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]483
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]484<!-- ======================================================================= -->
485<div class="doc_subsection">
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]486 <a name="x86-be">Known problems with the X86 back-end</a>
John Criswell3bdbd302005-11-08 21:11:33 +0000[diff] [blame]487</div>
488
489<div class="doc_text">
490
491<ul>
Anton Korobeynikov486c7d32008-06-08 10:24:13 +0000[diff] [blame]492 <li>The X86 backend does not yet support
493 all <a href="http://llvm.org/PR879">inline assembly that uses the X86
494 floating point stack</a>. It supports the 'f' and 't' constraints, but not
495 'u'.</li>
Chris Lattnerb076b002008-06-08 21:19:07 +0000[diff] [blame]496 <li>The X86 backend generates inefficient floating point code when configured
497 to generate code for systems that don't have SSE2.</li>
Duncan Sands0bc15262008-06-08 19:38:43 +0000[diff] [blame]498 <li>Win64 code generation wasn't widely tested. Everything should work, but we
Anton Korobeynikov486c7d32008-06-08 10:24:13 +0000[diff] [blame]499 expect small issues to happen. Also, llvm-gcc cannot build mingw64 runtime
500 currently due
501 to <a href="http://llvm.org/PR2255">several</a>
Chris Lattner54d12102008-06-08 23:12:47 +0000[diff] [blame]502 <a href="http://llvm.org/PR2257">bugs</a> due to lack of support for the
503 'u' inline assembly constraint and X87 floating point inline assembly.</li>
Dan Gohman721b3722008-06-08 23:05:11 +0000[diff] [blame]504 <li>The X86-64 backend does not yet support the LLVM IR instruction
505 <tt>va_arg</tt>. Currently, the llvm-gcc front-end supports variadic
506 argument constructs on X86-64 by lowering them manually.</li>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]507</ul>
508
509</div>
510
511<!-- ======================================================================= -->
512<div class="doc_subsection">
513 <a name="ppc-be">Known problems with the PowerPC back-end</a>
514</div>
515
516<div class="doc_text">
517
518<ul>
Nicolas Geoffray77d99502007-05-15 09:21:28 +0000[diff] [blame]519<li>The Linux PPC32/ABI support needs testing for the interpreter and static
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]520compilation, and lacks support for debug information.</li>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]521</ul>
522
523</div>
524
525<!-- ======================================================================= -->
526<div class="doc_subsection">
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]527 <a name="arm-be">Known problems with the ARM back-end</a>
528</div>
529
530<div class="doc_text">
531
532<ul>
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]533<li>Thumb mode works only on ARMv6 or higher processors. On sub-ARMv6
Duncan Sands47fc0a22007-09-26 15:59:54 +0000[diff] [blame]534processors, thumb programs can crash or produce wrong
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]535results (<a href="http://llvm.org/PR1388">PR1388</a>).</li>
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]536<li>Compilation for ARM Linux OABI (old ABI) is supported, but not fully tested.
537</li>
Chris Lattnerb076b002008-06-08 21:19:07 +0000[diff] [blame]538<li>There is a bug in QEMU-ARM (&lt;= 0.9.0) which causes it to incorrectly
539 execute
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]540programs compiled with LLVM. Please use more recent versions of QEMU.</li>
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]541</ul>
542
543</div>
544
545<!-- ======================================================================= -->
546<div class="doc_subsection">
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]547 <a name="sparc-be">Known problems with the SPARC back-end</a>
548</div>
549
550<div class="doc_text">
551
552<ul>
553<li>The SPARC backend only supports the 32-bit SPARC ABI (-m32), it does not
554 support the 64-bit SPARC ABI (-m64).</li>
555</ul>
556
557</div>
558
559<!-- ======================================================================= -->
560<div class="doc_subsection">
Bruno Cardoso Lopes24eb3de2008-10-25 14:56:26 +0000[diff] [blame]561 <a name="mips-be">Known problems with the MIPS back-end</a>
562</div>
563
564<div class="doc_text">
565
566<ul>
567<li>The O32 ABI is not fully supported.</li>
568<li>64-bit MIPS targets are not supported yet.</li>
569</ul>
570
571</div>
572
573<!-- ======================================================================= -->
574<div class="doc_subsection">
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]575 <a name="alpha-be">Known problems with the Alpha back-end</a>
576</div>
577
578<div class="doc_text">
579
580<ul>
581
582<li>On 21164s, some rare FP arithmetic sequences which may trap do not have the
583appropriate nops inserted to ensure restartability.</li>
584
John Criswell3bdbd302005-11-08 21:11:33 +0000[diff] [blame]585</ul>
586</div>
587
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]588<!-- ======================================================================= -->
589<div class="doc_subsection">
590 <a name="ia64-be">Known problems with the IA64 back-end</a>
591</div>
592
593<div class="doc_text">
594
595<ul>
Chris Lattner54d12102008-06-08 23:12:47 +0000[diff] [blame]596<li>The Itanium backend is highly experimental, and has a number of known
597 issues. We are looking for a maintainer for the Itanium backend. If you
Gabor Greife4544f72008-10-15 10:47:24 +0000[diff] [blame]598 are interested, please contact the LLVMdev mailing list.</li>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]599</ul>
600
601</div>
602
603<!-- ======================================================================= -->
604<div class="doc_subsection">
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]605 <a name="c-be">Known problems with the C back-end</a>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]606</div>
607
608<div class="doc_text">
609
610<ul>
Chris Lattnera1a4c9a2008-06-05 06:35:40 +0000[diff] [blame]611<li><a href="http://llvm.org/PR802">The C backend has only basic support for
612 inline assembly code</a>.</li>
Chris Lattner8e061162007-09-26 06:01:35 +0000[diff] [blame]613<li><a href="http://llvm.org/PR1658">The C backend violates the ABI of common
614 C++ programs</a>, preventing intermixing between C++ compiled by the CBE and
Duncan Sands56448462008-06-08 20:18:35 +0000[diff] [blame]615 C++ code compiled with llc or native compilers.</li>
Duncan Sandse09506a2008-02-10 13:40:55 +0000[diff] [blame]616<li>The C backend does not support all exception handling constructs.</li>
Duncan Sands3aa36732009-02-25 11:51:54 +0000[diff] [blame]617<li>The C backend does not support arbitrary precision integers.</li>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]618</ul>
619
620</div>
John Criswell3bdbd302005-11-08 21:11:33 +0000[diff] [blame]621
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]622
623<!-- ======================================================================= -->
624<div class="doc_subsection">
Chris Lattnera1a4c9a2008-06-05 06:35:40 +0000[diff] [blame]625 <a name="c-fe">Known problems with the llvm-gcc C front-end</a>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]626</div>
Chris Lattner178f3db2003-10-02 05:07:23 +0000[diff] [blame]627
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]628<div class="doc_text">
Chris Lattner72a269f2006-03-03 00:34:26 +0000[diff] [blame]629
Chris Lattnercdc44ed2008-02-06 18:00:06 +0000[diff] [blame]630<p>llvm-gcc does not currently support <a href="http://llvm.org/PR869">Link-Time
631Optimization</a> on most platforms "out-of-the-box". Please inquire on the
Gabor Greife4544f72008-10-15 10:47:24 +0000[diff] [blame]632LLVMdev mailing list if you are interested.</p>
Chris Lattner44124232006-08-08 17:27:28 +0000[diff] [blame]633
Chris Lattnera1a4c9a2008-06-05 06:35:40 +0000[diff] [blame]634<p>The only major language feature of GCC not supported by llvm-gcc is
635 the <tt>__builtin_apply</tt> family of builtins. However, some extensions
636 are only supported on some targets. For example, trampolines are only
Duncan Sands56448462008-06-08 20:18:35 +0000[diff] [blame]637 supported on some targets (these are used when you take the address of a
638 nested function).</p>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]639
Chris Lattnera1a4c9a2008-06-05 06:35:40 +0000[diff] [blame]640<p>If you run into GCC extensions which are not supported, please let us know.
641</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]642
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]643</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]644
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]645<!-- ======================================================================= -->
646<div class="doc_subsection">
Chris Lattnera1a4c9a2008-06-05 06:35:40 +0000[diff] [blame]647 <a name="c++-fe">Known problems with the llvm-gcc C++ front-end</a>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]648</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]649
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]650<div class="doc_text">
651
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]652<p>The C++ front-end is considered to be fully
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]653tested and works for a number of non-trivial programs, including LLVM
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]654itself, Qt, Mozilla, etc.</p>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]655
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]656<ul>
Anton Korobeynikov28f08aa2008-10-11 18:27:16 +0000[diff] [blame]657<li>Exception handling works well on the X86 and PowerPC targets. Currently
Chris Lattner2a092392008-11-10 05:40:34 +0000[diff] [blame]658 only Linux and Darwin targets are supported (both 32 and 64 bit).</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]659</ul>
Chris Lattner46ecf612003-10-07 22:14:37 +0000[diff] [blame]660
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]661</div>
662
Chris Lattner7292fb12008-10-30 03:58:13 +0000[diff] [blame]663<!-- ======================================================================= -->
664<div class="doc_subsection">
665 <a name="fortran-fe">Known problems with the llvm-gcc Fortran front-end</a>
666</div>
667
668<div class="doc_text">
Gabor Greife5f9d672008-11-04 21:50:59 +0000[diff] [blame]669<ul>
Chris Lattner7292fb12008-10-30 03:58:13 +0000[diff] [blame]670<li>Fortran support generally works, but there are still several unresolved bugs
671 in Bugzilla. Please see the tools/gfortran component for details.</li>
672
673<li>The Fortran front-end currently does not build on Darwin (without tweaks)
674 due to unresolved dependencies on the C front-end.</li>
Gabor Greife5f9d672008-11-04 21:50:59 +0000[diff] [blame]675</ul>
Chris Lattner7292fb12008-10-30 03:58:13 +0000[diff] [blame]676</div>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]677
Chris Lattnere38ac152008-02-12 06:29:45 +0000[diff] [blame]678<!-- ======================================================================= -->
679<div class="doc_subsection">
Chris Lattnera1a4c9a2008-06-05 06:35:40 +0000[diff] [blame]680 <a name="ada-fe">Known problems with the llvm-gcc Ada front-end</a>
Chris Lattnere38ac152008-02-12 06:29:45 +0000[diff] [blame]681</div>
682
683<div class="doc_text">
684The llvm-gcc 4.2 Ada compiler works fairly well, however this is not a mature
685technology and problems should be expected.
686<ul>
Duncan Sands56448462008-06-08 20:18:35 +0000[diff] [blame]687<li>The Ada front-end currently only builds on X86-32. This is mainly due
Chris Lattnere38ac152008-02-12 06:29:45 +0000[diff] [blame]688to lack of trampoline support (pointers to nested functions) on other platforms,
Duncan Sands56448462008-06-08 20:18:35 +0000[diff] [blame]689however 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]690which does support trampolines.</li>
691<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]692This is due to lack of LLVM support for <tt>setjmp</tt>/<tt>longjmp</tt> style
693exception handling, which is used internally by the compiler.
Chris Lattnere38ac152008-02-12 06:29:45 +0000[diff] [blame]694Workaround: configure with --disable-bootstrap.</li>
Duncan Sandsaef747f2008-10-13 17:27:23 +0000[diff] [blame]695<li>The c380004, <a href="http://llvm.org/PR2010">c393010</a>
696and <a href="http://llvm.org/PR2421">cxg2021</a> ACATS tests fail
Duncan Sandsd34bf762009-02-25 11:59:06 +0000[diff] [blame]697(c380004 also fails with gcc-4.2 mainline).
698If the compiler is built with checks disabled then <a href="http://llvm.org/PR2010">c393010</a>
699causes the compiler to go into an infinite loop, using up all system memory.</li>
Duncan Sandsaef747f2008-10-13 17:27:23 +0000[diff] [blame]700<li>Some gcc specific Ada tests continue to crash the compiler.</li>
Chris Lattnere38ac152008-02-12 06:29:45 +0000[diff] [blame]701<li>The -E binder option (exception backtraces)
702<a href="http://llvm.org/PR1982">does not work</a> and will result in programs
703crashing if an exception is raised. Workaround: do not use -E.</li>
704<li>Only discrete types <a href="http://llvm.org/PR1981">are allowed to start
705or finish at a non-byte offset</a> in a record. Workaround: do not pack records
706or use representation clauses that result in a field of a non-discrete type
707starting or finishing in the middle of a byte.</li>
Chris Lattnerb076b002008-06-08 21:19:07 +0000[diff] [blame]708<li>The <tt>lli</tt> interpreter <a href="http://llvm.org/PR2009">considers
709'main' as generated by the Ada binder to be invalid</a>.
710Workaround: hand edit the file to use pointers for <tt>argv</tt> and
711<tt>envp</tt> rather than integers.</li>
712<li>The <tt>-fstack-check</tt> option <a href="http://llvm.org/PR2008">is
713ignored</a>.</li>
Chris Lattnere38ac152008-02-12 06:29:45 +0000[diff] [blame]714</ul>
715</div>
716
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]717<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]718<div class="doc_section">
719 <a name="additionalinfo">Additional Information</a>
720</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]721<!-- *********************************************************************** -->
722
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]723<div class="doc_text">
724
Chris Lattnercb5596d2005-05-16 17:13:10 +0000[diff] [blame]725<p>A wide variety of additional information is available on the <a
Chris Lattnere0c1df42007-05-18 00:44:29 +0000[diff] [blame]726href="http://llvm.org">LLVM web page</a>, in particular in the <a
727href="http://llvm.org/docs/">documentation</a> section. The web page also
Reid Spencerc7f87f22007-07-09 08:04:31 +0000[diff] [blame]728contains versions of the API documentation which is up-to-date with the
729Subversion version of the source code.
Misha Brukman96158092005-03-30 19:14:24 +0000[diff] [blame]730You can access versions of these documents specific to this release by going
731into the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]732
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]733<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]734us via the <a href="http://llvm.org/docs/#maillist"> mailing
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]735lists</a>.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]736
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]737</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]738
739<!-- *********************************************************************** -->
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]740
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]741<hr>
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