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gerrit-public.fairphone.software / fp2-dev / platform / external / llvm / c1771e3539453126036de28a45ef9797a118b58f / . / docs / ReleaseNotes.html
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3<html>
4<head>
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Chris Lattner38ab04c2009-02-25 04:41:31 +0000[diff] [blame]7 <title>LLVM 2.5 Release Notes</title>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]8</head>
9<body>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]10
Chris Lattner38ab04c2009-02-25 04:41:31 +0000[diff] [blame]11<div class="doc_title">LLVM 2.5 Release Notes</div>
Mikhail Glushenkovea65d7d2008-10-13 02:08:34 +0000[diff] [blame]12
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]13<ol>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]14 <li><a href="#intro">Introduction</a></li>
Chris Lattner96a445e2008-10-13 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 Lattner4b538b92004-04-30 22:17:12 +0000[diff] [blame]17 <li><a href="GettingStarted.html">Installation Instructions</a></li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]18 <li><a href="#portability">Portability and Supported Platforms</a></li>
Dan Gohman44aa9212008-10-14 16:23:02 +0000[diff] [blame]19 <li><a href="#knownproblems">Known Problems</a></li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]20 <li><a href="#additionalinfo">Additional Information</a></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]21</ol>
22
Chris Lattner7911ce22004-05-23 21:07:27 +0000[diff] [blame]23<div class="doc_author">
Dan Gohman44aa9212008-10-14 16:23:02 +0000[diff] [blame]24 <p>Written by the <a href="http://llvm.org">LLVM Team</a></p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]25</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]26
27<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]28<div class="doc_section">
29 <a name="intro">Introduction</a>
30</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]31<!-- *********************************************************************** -->
32
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]33<div class="doc_text">
34
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]35<p>This document contains the release notes for the LLVM Compiler
Chris Lattner38ab04c2009-02-25 04:41:31 +0000[diff] [blame]36Infrastructure, release 2.5. Here we describe the status of LLVM, including
Chris Lattnerf6662f92008-10-13 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 Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]40
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame]41<p>For more information about LLVM, including information about the latest
Chris Lattnerc463b272005-10-29 07:07:09 +0000[diff] [blame]42release, please check out the <a href="http://llvm.org/">main LLVM
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]43web site</a>. If you have questions or comments, the <a
Chris Lattnerf6662f92008-10-13 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 Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]46
Mikhail Glushenkovea65d7d2008-10-13 02:08:34 +0000[diff] [blame]47<p>Note that if you are reading this file from a Subversion checkout or the
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]48main LLVM web page, this document applies to the <i>next</i> release, not the
Gabor Greiffa933f82008-10-14 11:00:32 +0000[diff] [blame]49current one. To see the release notes for a specific release, please see the
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]50<a href="http://llvm.org/releases/">releases page</a>.</p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]51
52</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]53
Chris Lattner38ab04c2009-02-25 04:41:31 +0000[diff] [blame]54<!-- Unfinished features in 2.5:
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]55 Machine LICM
56 Machine Sinking
Chris Lattner74c80df2009-02-25 06:34:50 +0000[diff] [blame]57 target-specific intrinsics
58 gold lto plugin
Chris Lattner99f375b2009-02-25 07:32:53 +0000[diff] [blame]59 pre-alloc splitter, strong phi elim
Chris Lattner547a3912008-10-12 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 Lattner74c80df2009-02-25 06:34:50 +0000[diff] [blame]62 debug info for optimized code
Chris Lattnerc1771e32009-02-26 07:29:17 +0000[diff] [blame^]63 interpreter + libffi
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]64 -->
Mikhail Glushenkovea65d7d2008-10-13 02:08:34 +0000[diff] [blame]65
Chris Lattner547a3912008-10-12 19:47:48 +0000[diff] [blame]66 <!-- for announcement email:
Chris Lattner74c80df2009-02-25 06:34:50 +0000[diff] [blame]67 -->
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]68
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]69<!-- *********************************************************************** -->
70<div class="doc_section">
71 <a name="subproj">Sub-project Status Update</a>
Chris Lattnerea34f642008-06-08 21:34:41 +0000[diff] [blame]72</div>
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]73<!-- *********************************************************************** -->
Chris Lattnerea34f642008-06-08 21:34:41 +0000[diff] [blame]74
75<div class="doc_text">
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]76<p>
Chris Lattner38ab04c2009-02-25 04:41:31 +0000[diff] [blame]77The LLVM 2.5 distribution currently consists of code from the core LLVM
Chris Lattnerfb97b2d2008-10-13 18:11:54 +0000[diff] [blame]78repository (which roughly includes the LLVM optimizers, code generators and
Chris Lattner8348b472008-06-08 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 Lattner857fb132008-10-11 18:18:28 +0000[diff] [blame]81are the most actively developed are the <a href="#clang">Clang Project</a> and
Nicolas Geoffray99a4d302008-10-14 19:23:04 +0000[diff] [blame]82the <a href="#vmkit">VMKit Project</a>.
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]83</p>
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]84
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]85</div>
86
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]87
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]88<!--=========================================================================-->
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]89<div class="doc_subsection">
Chris Lattnerfb97b2d2008-10-13 18:11:54 +0000[diff] [blame]90<a name="clang">Clang: C/C++/Objective-C Frontend Toolkit</a>
Chris Lattner8348b472008-06-08 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 Lattnerf40c40b2009-02-25 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 Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]104
Chris Lattnerf40c40b2009-02-25 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 Lattner74c80df2009-02-25 06:34:50 +0000[diff] [blame]108by <a href="http://clang.llvm.org/get_started.html">building from mainline</a>
Chris Lattnerf40c40b2009-02-25 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 Wendling741748a2008-10-27 09:27:33 +0000[diff] [blame]114
Daniel Dunbar13739432008-10-14 23:25:09 +0000[diff] [blame]115<ul>
Chris Lattnerf40c40b2009-02-25 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 Lattnerfb97b2d2008-10-13 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 Kremenek3c3ec0c2008-10-14 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 Lattnerc702d162008-10-14 06:02:29 +0000[diff] [blame]135of checks to find bugs that occur on a specific path within a program. Examples
Ted Kremenek3c3ec0c2008-10-14 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 Lattnerc702d162008-10-14 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 Lattnercc042612008-10-14 00:52:49 +0000[diff] [blame]141
Ted Kremenek3c3ec0c2008-10-14 05:14:21 +0000[diff] [blame]142<p>The tool also provides a simple web GUI to inspect potential bugs found by
Chris Lattnerc702d162008-10-14 06:02:29 +0000[diff] [blame]143the tool. While still early in development, the GUI illustrates some of the key
Ted Kremenek3c3ec0c2008-10-14 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 Wendling741748a2008-10-27 09:27:33 +0000[diff] [blame]146that span multiple lines); and built-in knowledge of macros, which is used to
Ted Kremenek3c3ec0c2008-10-14 05:14:21 +0000[diff] [blame]147perform inline expansion of macros within the GUI itself.</p>
148
Chris Lattnerc702d162008-10-14 06:02:29 +0000[diff] [blame]149<p>The set of checks performed by the static analyzer is gradually expanding,
Bill Wendling741748a2008-10-27 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 Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]154
155</div>
156
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]157<!--=========================================================================-->
158<div class="doc_subsection">
Nicolas Geoffray99a4d302008-10-14 19:23:04 +0000[diff] [blame]159<a name="vmkit">VMKit: JVM/CLI Virtual Machine Implementation</a>
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]160</div>
161
162<div class="doc_text">
163<p>
Nicolas Geoffray99a4d302008-10-14 19:23:04 +0000[diff] [blame]164The <a href="http://vmkit.llvm.org/">VMKit project</a> is an implementation of
Chris Lattner96a445e2008-10-13 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 Lattner1f859862009-02-25 05:45:05 +0000[diff] [blame]168<p>Following LLVM 2.5, VMKit has its first release ? that you can find on its
Nicolas Geoffray56d313d2008-10-15 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 Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]171
Nicolas Geoffray99a4d302008-10-14 19:23:04 +0000[diff] [blame]172<ul>
173
Chris Lattner75e26ca2009-02-26 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 Geoffray99a4d302008-10-14 19:23:04 +0000[diff] [blame]187
188</ul>
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]189</div>
190
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]191
192<!-- *********************************************************************** -->
193<div class="doc_section">
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]194 <a name="whatsnew">What's New in LLVM?</a>
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]195</div>
196<!-- *********************************************************************** -->
197
Chris Lattnerf8e0b4e2008-06-08 22:59:35 +0000[diff] [blame]198<div class="doc_text">
199
Bill Wendling741748a2008-10-27 09:27:33 +0000[diff] [blame]200<p>This release includes a huge number of bug fixes, performance tweaks, and
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]201minor improvements. Some of the major improvements and new features are listed
202in this section.
Chris Lattnerf8e0b4e2008-06-08 22:59:35 +0000[diff] [blame]203</p>
204</div>
205
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]206<!--=========================================================================-->
Chris Lattnerea34f642008-06-08 21:34:41 +0000[diff] [blame]207<div class="doc_subsection">
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]208<a name="majorfeatures">Major New Features</a>
209</div>
210
211<div class="doc_text">
212
Chris Lattner38ab04c2009-02-25 04:41:31 +0000[diff] [blame]213<p>LLVM 2.5 includes several major new capabilities:</p>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]214
215<ul>
Duncan Sands8524cb92009-02-25 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 Lattner74c80df2009-02-25 06:34:50 +0000[diff] [blame]225
226<!--
227Random stuff:
228
Chris Lattnerc1771e32009-02-26 07:29:17 +0000[diff] [blame^]229Pure project: http://code.google.com/p/pure-lang/
230
231
Chris Lattner99f375b2009-02-25 07:32:53 +0000[diff] [blame]232xcore backend!
233fortran on darwin!
234
Chris Lattnerc1771e32009-02-26 07:29:17 +0000[diff] [blame^]235.ll parser rewrite, caret diags, better errors, less fragile (less likely to
236 crash on strange things). No longer depends on flex/bison.
Chris Lattnerd838fcd2009-02-26 06:47:09 +0000[diff] [blame]237GCC inliner off, llvm handles always-inline.
Chris Lattner74c80df2009-02-25 06:34:50 +0000[diff] [blame]238cmake mature?
Chris Lattnerc1771e32009-02-26 07:29:17 +0000[diff] [blame^]239x86 backend GS segment -> addr space 256 (r62980)
Chris Lattner74c80df2009-02-25 06:34:50 +0000[diff] [blame]240nocapture
Chris Lattnerd838fcd2009-02-26 06:47:09 +0000[diff] [blame]241memdep (used by GVN and memcpyopt) is faster / more aggressive.
Chris Lattner99f375b2009-02-25 07:32:53 +0000[diff] [blame]242how to write a backend doc docs/WritingAnLLVMBackend.html
Chris Lattner74c80df2009-02-25 06:34:50 +0000[diff] [blame]243fastisel + exception handling
244vector widening <3 x float> -> <4 x float>
Chris Lattner99f375b2009-02-25 07:32:53 +0000[diff] [blame]245arm port improvements? arm jit encoding stuff, constant island support?
Chris Lattner75e26ca2009-02-26 05:20:36 +0000[diff] [blame]246JIT TLS support on x86-32.
Chris Lattner99f375b2009-02-25 07:32:53 +0000[diff] [blame]247mem2reg now faster on code with huge basic blocks
248stack protectors/stack canaries, -fstack-protector, controllable on a
249 per-function basis with attributes.
250shufflevector is generalized to allow different shuffle mask width than its
251 input vectors.
252loop optimizer improves floating point induction variables
253llvm/Analysis/DebugInfo.h classes, llvm-gcc and clang and codegen use them.
Chris Lattnerc1771e32009-02-26 07:29:17 +0000[diff] [blame^]254 DebugInfoBuilder gone.
Chris Lattner99f375b2009-02-25 07:32:53 +0000[diff] [blame]255asmprinters seperate from targets for jits
Chris Lattner75e26ca2009-02-26 05:20:36 +0000[diff] [blame]256PBQP register allocator now supports register coalescing.
Chris Lattnerd838fcd2009-02-26 06:47:09 +0000[diff] [blame]257JIT supports exceptions on linux/x86-64.
258integer overflow intrinsics for [us](add/sub/mul). Supported on all targets,
259 but only generates efficient code on x86.
260X86 backend now supports -disable-mmx.
261noalias attribute on return value indicates that function returns new memory
262 (e.g. malloc).
Chris Lattnerc1771e32009-02-26 07:29:17 +0000[diff] [blame^]263postalloc scheduler: anti dependence breaking, hazard recognizer?
Chris Lattnerd838fcd2009-02-26 06:47:09 +0000[diff] [blame]264llvmc2 renamed to llvmc
265Jump threading more powerful: it is iterative, handles threading based on values
266 with fully redundant and partially redundant loads.
267LSR improvements?
268ARM debug info support?
269unit test framework based on Google Test.
270
271vector shift support + X86 backend.
Chris Lattnerc1771e32009-02-26 07:29:17 +0000[diff] [blame^]272x86 JIT now detects core i7 and atom, autoconfiguring itself appropriately.
273SROA is more aggressive about promoting unions.
274non-zero __builtin_return_address values on X86.
275x86-64 now uses red zone (unless -mno-red-zone option is specified).
276private linkage.
Chris Lattner75e26ca2009-02-26 05:20:36 +0000[diff] [blame]277
Chris Lattnerc1771e32009-02-26 07:29:17 +0000[diff] [blame^]278llvm-gcc defaults to -fno-math-errno on all x86 targets.
279
280initial support for debug line numbers when optimization enabled, not useful in
281 2.5 but will be for 2.6.
Chris Lattner74c80df2009-02-25 06:34:50 +0000[diff] [blame]282-->
Chris Lattnerbc5786b2008-06-05 06:57:39 +0000[diff] [blame]283
Chris Lattner8170c102008-02-10 08:18:42 +0000[diff] [blame]284</ul>
285
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]286</div>
287
Chris Lattner791f77b2008-06-05 06:25:56 +0000[diff] [blame]288
289<!--=========================================================================-->
290<div class="doc_subsection">
Chris Lattnerea34f642008-06-08 21:34:41 +0000[diff] [blame]291<a name="llvm-gcc">llvm-gcc 4.2 Improvements</a>
Chris Lattner791f77b2008-06-05 06:25:56 +0000[diff] [blame]292</div>
293
294<div class="doc_text">
295
Chris Lattnerb82eb062008-10-13 20:47:20 +0000[diff] [blame]296<p>LLVM fully supports the llvm-gcc 4.2 front-end, which marries the GCC
297front-ends and driver with the LLVM optimizer and code generator. It currently
298includes support for the C, C++, Objective-C, Ada, and Fortran front-ends.</p>
Chris Lattner791f77b2008-06-05 06:25:56 +0000[diff] [blame]299
Chris Lattnerf8e0b4e2008-06-08 22:59:35 +0000[diff] [blame]300<ul>
Chris Lattner38ab04c2009-02-25 04:41:31 +0000[diff] [blame]301<li>?</li>
Gabor Greifa3bd11d2008-06-09 06:06:18 +0000[diff] [blame]302</ul>
Chris Lattner791f77b2008-06-05 06:25:56 +0000[diff] [blame]303
Chris Lattner791f77b2008-06-05 06:25:56 +0000[diff] [blame]304</div>
305
306
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]307<!--=========================================================================-->
308<div class="doc_subsection">
Chris Lattnerf304ffc2008-02-10 08:17:19 +0000[diff] [blame]309<a name="coreimprovements">LLVM Core Improvements</a>
310</div>
311
312<div class="doc_text">
Bill Wendling741748a2008-10-27 09:27:33 +0000[diff] [blame]313<p>New features include:</p>
Chris Lattnerf304ffc2008-02-10 08:17:19 +0000[diff] [blame]314
Chris Lattner791f77b2008-06-05 06:25:56 +0000[diff] [blame]315<ul>
Chris Lattner38ab04c2009-02-25 04:41:31 +0000[diff] [blame]316<li>?</li>
Chris Lattner7752d1a2008-10-13 20:59:32 +0000[diff] [blame]317
Chris Lattnerf304ffc2008-02-10 08:17:19 +0000[diff] [blame]318</ul>
Mikhail Glushenkovea65d7d2008-10-13 02:08:34 +0000[diff] [blame]319
Chris Lattnerf304ffc2008-02-10 08:17:19 +0000[diff] [blame]320</div>
321
322<!--=========================================================================-->
323<div class="doc_subsection">
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]324<a name="optimizer">Optimizer Improvements</a>
325</div>
326
327<div class="doc_text">
328
Chris Lattnerf3013872008-10-13 21:50:36 +0000[diff] [blame]329<p>In addition to a huge array of bug fixes and minor performance tweaks, this
330release includes a few major enhancements and additions to the optimizers:</p>
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]331
332<ul>
333
Chris Lattner38ab04c2009-02-25 04:41:31 +0000[diff] [blame]334<li>?</li>
Chris Lattnerf3013872008-10-13 21:50:36 +0000[diff] [blame]335
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]336</ul>
337
338</div>
339
340<!--=========================================================================-->
341<div class="doc_subsection">
342<a name="codegen">Code Generator Improvements</a>
343</div>
344
345<div class="doc_text">
346
Gabor Greifa8b84902008-10-14 11:31:14 +0000[diff] [blame]347<p>We have put a significant amount of work into the code generator infrastructure,
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]348which allows us to implement more aggressive algorithms and make it run
349faster:</p>
350
351<ul>
Duncan Sands07636ea2009-02-25 11:50:08 +0000[diff] [blame]352<li>The type legalization logic has been completely rewritten, and is now
353more powerful (it supports arbitrary precision integer types for example)
354and hopefully more correct.
355The type legalizer converts operations on types that are not natively
356supported by the target machine into equivalent code sequences that only use
357natively supported types.
358The old type legalizer is still available and will be used if
359<tt>-disable-legalize-types</tt> is passed to <tt>llc</tt>.
360</li>
Chris Lattner38ab04c2009-02-25 04:41:31 +0000[diff] [blame]361<li>?</li>
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]362
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]363</ul>
364
365</div>
366
367
368<!--=========================================================================-->
369<div class="doc_subsection">
Chris Lattnereeb4da02008-10-13 22:06:31 +0000[diff] [blame]370<a name="targetspecific">Target Specific Improvements</a>
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]371</div>
Chris Lattner60893e52007-05-18 06:33:02 +0000[diff] [blame]372
Chris Lattner738bd302006-04-18 06:32:08 +0000[diff] [blame]373<div class="doc_text">
Chris Lattnerf304ffc2008-02-10 08:17:19 +0000[diff] [blame]374<p>New target-specific features include:
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]375</p>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]376
377<ul>
Chris Lattner38ab04c2009-02-25 04:41:31 +0000[diff] [blame]378<li>?</li>
Chris Lattner77d29b12008-06-05 08:02:49 +0000[diff] [blame]379</ul>
Chris Lattner77d29b12008-06-05 08:02:49 +0000[diff] [blame]380
Mikhail Glushenkovea65d7d2008-10-13 02:08:34 +0000[diff] [blame]381</div>
Chris Lattner77d29b12008-06-05 08:02:49 +0000[diff] [blame]382
383
384<!--=========================================================================-->
385<div class="doc_subsection">
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]386<a name="otherimprovements">Other Improvements</a>
387</div>
388
389<div class="doc_text">
390<p>New features include:
391</p>
392
393<ul>
Chris Lattner38ab04c2009-02-25 04:41:31 +0000[diff] [blame]394<li>?</li>
Tanya Lattnera7ec7062008-11-04 18:40:27 +0000[diff] [blame]395
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]396</ul>
Mikhail Glushenkovea65d7d2008-10-13 02:08:34 +0000[diff] [blame]397
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]398</div>
Chris Lattnerc5d658a2006-03-03 00:34:26 +0000[diff] [blame]399
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]400<!--=========================================================================-->
401<div class="doc_subsection">
402<a name="changes">Major Changes and Removed Features</a>
403</div>
404
405<div class="doc_text">
406
Chris Lattnereeb4da02008-10-13 22:06:31 +0000[diff] [blame]407<p>If you're already an LLVM user or developer with out-of-tree changes based
Chris Lattner38ab04c2009-02-25 04:41:31 +0000[diff] [blame]408on LLVM 2.4, this section lists some "gotchas" that you may run into upgrading
Chris Lattnereeb4da02008-10-13 22:06:31 +0000[diff] [blame]409from the previous release.</p>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]410
411<ul>
412
Chris Lattner38ab04c2009-02-25 04:41:31 +0000[diff] [blame]413<li>?</li>
Chris Lattnereeb4da02008-10-13 22:06:31 +0000[diff] [blame]414</ul>
415
416
417<p>In addition, many APIs have changed in this release. Some of the major LLVM
418API changes are:</p>
419
420<ul>
Chris Lattner38ab04c2009-02-25 04:41:31 +0000[diff] [blame]421<li>?</li>
Devang Patelb34dd132008-10-14 20:03:43 +0000[diff] [blame]422</ul>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]423
Chris Lattner38ab04c2009-02-25 04:41:31 +0000[diff] [blame]424<li>?</li>
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]425</ul>
426
427</div>
428
429
430
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]431<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]432<div class="doc_section">
433 <a name="portability">Portability and Supported Platforms</a>
434</div>
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]435<!-- *********************************************************************** -->
436
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]437<div class="doc_text">
438
John Criswell0b5b5e92004-12-08 20:35:47 +0000[diff] [blame]439<p>LLVM is known to work on the following platforms:</p>
Chris Lattner4654bdb2004-06-01 18:22:41 +0000[diff] [blame]440
441<ul>
Chris Lattnere18b32e2008-11-10 05:40:34 +0000[diff] [blame]442<li>Intel and AMD machines (IA32, X86-64, AMD64, EMT-64) running Red Hat
443Linux, Fedora Core and FreeBSD (and probably other unix-like systems).</li>
444<li>PowerPC and X86-based Mac OS X systems, running 10.3 and above in 32-bit
445and 64-bit modes.</li>
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]446<li>Intel and AMD machines running on Win32 using MinGW libraries (native).</li>
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]447<li>Intel and AMD machines running on Win32 with the Cygwin libraries (limited
448 support is available for native builds with Visual C++).</li>
Gabor Greif96a89c72008-06-05 18:39:01 +0000[diff] [blame]449<li>Sun UltraSPARC workstations running Solaris 10.</li>
John Criswell9321fa82005-05-13 20:28:15 +0000[diff] [blame]450<li>Alpha-based machines running Debian GNU/Linux.</li>
Gabor Greif96a89c72008-06-05 18:39:01 +0000[diff] [blame]451<li>Itanium-based (IA64) machines running Linux and HP-UX.</li>
Chris Lattner4654bdb2004-06-01 18:22:41 +0000[diff] [blame]452</ul>
453
Chris Lattnerbc5786b2008-06-05 06:57:39 +0000[diff] [blame]454<p>The core LLVM infrastructure uses GNU autoconf to adapt itself
Brian Gaekeb0fd7612004-05-09 05:28:35 +0000[diff] [blame]455to the machine and operating system on which it is built. However, minor
456porting may be required to get LLVM to work on new platforms. We welcome your
457portability patches and reports of successful builds or error messages.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]458
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]459</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]460
461<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]462<div class="doc_section">
463 <a name="knownproblems">Known Problems</a>
464</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]465<!-- *********************************************************************** -->
466
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]467<div class="doc_text">
468
Chris Lattnere18b32e2008-11-10 05:40:34 +0000[diff] [blame]469<p>This section contains significant known problems with the LLVM system,
470listed by component. If you run into a problem, please check the <a
Chris Lattnerc463b272005-10-29 07:07:09 +0000[diff] [blame]471href="http://llvm.org/bugs/">LLVM bug database</a> and submit a bug if
Chris Lattner5eccca42003-12-12 21:22:16 +0000[diff] [blame]472there isn't already one.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]473
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]474</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]475
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]476<!-- ======================================================================= -->
477<div class="doc_subsection">
478 <a name="experimental">Experimental features included with this release</a>
479</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]480
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]481<div class="doc_text">
482
Misha Brukman6df9e2c2004-05-12 21:46:05 +0000[diff] [blame]483<p>The following components of this LLVM release are either untested, known to
484be broken or unreliable, or are in early development. These components should
485not be relied on, and bugs should not be filed against them, but they may be
486useful to some people. In particular, if you would like to work on one of these
Chris Lattner2b659ef2008-02-12 06:29:45 +0000[diff] [blame]487components, please contact us on the <a
488href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVMdev list</a>.</p>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]489
490<ul>
Gabor Greifa8b84902008-10-14 11:31:14 +0000[diff] [blame]491<li>The MSIL, IA64, Alpha, SPU, MIPS, and PIC16 backends are experimental.</li>
Duncan Sands27aff872008-06-08 20:18:35 +0000[diff] [blame]492<li>The llc "<tt>-filetype=asm</tt>" (the default) is the only supported
Chris Lattner000c73b2008-02-06 06:30:34 +0000[diff] [blame]493 value for this option.</li>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]494</ul>
495
496</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]497
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]498<!-- ======================================================================= -->
499<div class="doc_subsection">
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]500 <a name="x86-be">Known problems with the X86 back-end</a>
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]501</div>
502
503<div class="doc_text">
504
505<ul>
Anton Korobeynikova6094be2008-06-08 10:24:13 +0000[diff] [blame]506 <li>The X86 backend does not yet support
507 all <a href="http://llvm.org/PR879">inline assembly that uses the X86
508 floating point stack</a>. It supports the 'f' and 't' constraints, but not
509 'u'.</li>
Chris Lattnere6e1b352008-06-08 21:19:07 +0000[diff] [blame]510 <li>The X86 backend generates inefficient floating point code when configured
511 to generate code for systems that don't have SSE2.</li>
Duncan Sands47eff2b2008-06-08 19:38:43 +0000[diff] [blame]512 <li>Win64 code generation wasn't widely tested. Everything should work, but we
Anton Korobeynikova6094be2008-06-08 10:24:13 +0000[diff] [blame]513 expect small issues to happen. Also, llvm-gcc cannot build mingw64 runtime
514 currently due
515 to <a href="http://llvm.org/PR2255">several</a>
Chris Lattner04af7cb2008-06-08 23:12:47 +0000[diff] [blame]516 <a href="http://llvm.org/PR2257">bugs</a> due to lack of support for the
517 'u' inline assembly constraint and X87 floating point inline assembly.</li>
Dan Gohman8207ba92008-06-08 23:05:11 +0000[diff] [blame]518 <li>The X86-64 backend does not yet support the LLVM IR instruction
519 <tt>va_arg</tt>. Currently, the llvm-gcc front-end supports variadic
520 argument constructs on X86-64 by lowering them manually.</li>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]521</ul>
522
523</div>
524
525<!-- ======================================================================= -->
526<div class="doc_subsection">
527 <a name="ppc-be">Known problems with the PowerPC back-end</a>
528</div>
529
530<div class="doc_text">
531
532<ul>
Nicolas Geoffraye4285dc2007-05-15 09:21:28 +0000[diff] [blame]533<li>The Linux PPC32/ABI support needs testing for the interpreter and static
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]534compilation, and lacks support for debug information.</li>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]535</ul>
536
537</div>
538
539<!-- ======================================================================= -->
540<div class="doc_subsection">
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]541 <a name="arm-be">Known problems with the ARM back-end</a>
542</div>
543
544<div class="doc_text">
545
546<ul>
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]547<li>Thumb mode works only on ARMv6 or higher processors. On sub-ARMv6
Duncan Sandsc90d68b2007-09-26 15:59:54 +0000[diff] [blame]548processors, thumb programs can crash or produce wrong
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]549results (<a href="http://llvm.org/PR1388">PR1388</a>).</li>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]550<li>Compilation for ARM Linux OABI (old ABI) is supported, but not fully tested.
551</li>
Chris Lattnere6e1b352008-06-08 21:19:07 +0000[diff] [blame]552<li>There is a bug in QEMU-ARM (&lt;= 0.9.0) which causes it to incorrectly
553 execute
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]554programs compiled with LLVM. Please use more recent versions of QEMU.</li>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]555</ul>
556
557</div>
558
559<!-- ======================================================================= -->
560<div class="doc_subsection">
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]561 <a name="sparc-be">Known problems with the SPARC back-end</a>
562</div>
563
564<div class="doc_text">
565
566<ul>
567<li>The SPARC backend only supports the 32-bit SPARC ABI (-m32), it does not
568 support the 64-bit SPARC ABI (-m64).</li>
569</ul>
570
571</div>
572
573<!-- ======================================================================= -->
574<div class="doc_subsection">
Bruno Cardoso Lopesb7e1a4f2008-10-25 14:56:26 +0000[diff] [blame]575 <a name="mips-be">Known problems with the MIPS back-end</a>
576</div>
577
578<div class="doc_text">
579
580<ul>
581<li>The O32 ABI is not fully supported.</li>
582<li>64-bit MIPS targets are not supported yet.</li>
583</ul>
584
585</div>
586
587<!-- ======================================================================= -->
588<div class="doc_subsection">
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]589 <a name="alpha-be">Known problems with the Alpha back-end</a>
590</div>
591
592<div class="doc_text">
593
594<ul>
595
596<li>On 21164s, some rare FP arithmetic sequences which may trap do not have the
597appropriate nops inserted to ensure restartability.</li>
598
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]599</ul>
600</div>
601
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]602<!-- ======================================================================= -->
603<div class="doc_subsection">
604 <a name="ia64-be">Known problems with the IA64 back-end</a>
605</div>
606
607<div class="doc_text">
608
609<ul>
Chris Lattner04af7cb2008-06-08 23:12:47 +0000[diff] [blame]610<li>The Itanium backend is highly experimental, and has a number of known
611 issues. We are looking for a maintainer for the Itanium backend. If you
Gabor Greif3bd3a262008-10-15 10:47:24 +0000[diff] [blame]612 are interested, please contact the LLVMdev mailing list.</li>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]613</ul>
614
615</div>
616
617<!-- ======================================================================= -->
618<div class="doc_subsection">
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]619 <a name="c-be">Known problems with the C back-end</a>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]620</div>
621
622<div class="doc_text">
623
624<ul>
Chris Lattner5733b272008-06-05 06:35:40 +0000[diff] [blame]625<li><a href="http://llvm.org/PR802">The C backend has only basic support for
626 inline assembly code</a>.</li>
Chris Lattner725a0d82007-09-26 06:01:35 +0000[diff] [blame]627<li><a href="http://llvm.org/PR1658">The C backend violates the ABI of common
628 C++ programs</a>, preventing intermixing between C++ compiled by the CBE and
Duncan Sands27aff872008-06-08 20:18:35 +0000[diff] [blame]629 C++ code compiled with llc or native compilers.</li>
Duncan Sandsf74c0cc2008-02-10 13:40:55 +0000[diff] [blame]630<li>The C backend does not support all exception handling constructs.</li>
Duncan Sands50723a92009-02-25 11:51:54 +0000[diff] [blame]631<li>The C backend does not support arbitrary precision integers.</li>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]632</ul>
633
634</div>
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]635
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]636
637<!-- ======================================================================= -->
638<div class="doc_subsection">
Chris Lattner5733b272008-06-05 06:35:40 +0000[diff] [blame]639 <a name="c-fe">Known problems with the llvm-gcc C front-end</a>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]640</div>
Chris Lattner47588f92003-10-02 05:07:23 +0000[diff] [blame]641
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]642<div class="doc_text">
Chris Lattnerc5d658a2006-03-03 00:34:26 +0000[diff] [blame]643
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]644<p>llvm-gcc does not currently support <a href="http://llvm.org/PR869">Link-Time
645Optimization</a> on most platforms "out-of-the-box". Please inquire on the
Gabor Greif3bd3a262008-10-15 10:47:24 +0000[diff] [blame]646LLVMdev mailing list if you are interested.</p>
Chris Lattnerd9ea0172006-08-08 17:27:28 +0000[diff] [blame]647
Chris Lattner5733b272008-06-05 06:35:40 +0000[diff] [blame]648<p>The only major language feature of GCC not supported by llvm-gcc is
649 the <tt>__builtin_apply</tt> family of builtins. However, some extensions
650 are only supported on some targets. For example, trampolines are only
Duncan Sands27aff872008-06-08 20:18:35 +0000[diff] [blame]651 supported on some targets (these are used when you take the address of a
652 nested function).</p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]653
Chris Lattner5733b272008-06-05 06:35:40 +0000[diff] [blame]654<p>If you run into GCC extensions which are not supported, please let us know.
655</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]656
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]657</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]658
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]659<!-- ======================================================================= -->
660<div class="doc_subsection">
Chris Lattner5733b272008-06-05 06:35:40 +0000[diff] [blame]661 <a name="c++-fe">Known problems with the llvm-gcc C++ front-end</a>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]662</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]663
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]664<div class="doc_text">
665
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]666<p>The C++ front-end is considered to be fully
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame]667tested and works for a number of non-trivial programs, including LLVM
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]668itself, Qt, Mozilla, etc.</p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]669
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]670<ul>
Anton Korobeynikov0021fc12008-10-11 18:27:16 +0000[diff] [blame]671<li>Exception handling works well on the X86 and PowerPC targets. Currently
Chris Lattnere18b32e2008-11-10 05:40:34 +0000[diff] [blame]672 only Linux and Darwin targets are supported (both 32 and 64 bit).</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]673</ul>
Chris Lattnerfcc54b32003-10-07 22:14:37 +0000[diff] [blame]674
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]675</div>
676
Chris Lattner1eb4df62008-10-30 03:58:13 +0000[diff] [blame]677<!-- ======================================================================= -->
678<div class="doc_subsection">
679 <a name="fortran-fe">Known problems with the llvm-gcc Fortran front-end</a>
680</div>
681
682<div class="doc_text">
Gabor Greifba10fe02008-11-04 21:50:59 +0000[diff] [blame]683<ul>
Chris Lattner1eb4df62008-10-30 03:58:13 +0000[diff] [blame]684<li>Fortran support generally works, but there are still several unresolved bugs
685 in Bugzilla. Please see the tools/gfortran component for details.</li>
686
687<li>The Fortran front-end currently does not build on Darwin (without tweaks)
688 due to unresolved dependencies on the C front-end.</li>
Gabor Greifba10fe02008-11-04 21:50:59 +0000[diff] [blame]689</ul>
Chris Lattner1eb4df62008-10-30 03:58:13 +0000[diff] [blame]690</div>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]691
Chris Lattner2b659ef2008-02-12 06:29:45 +0000[diff] [blame]692<!-- ======================================================================= -->
693<div class="doc_subsection">
Chris Lattner5733b272008-06-05 06:35:40 +0000[diff] [blame]694 <a name="ada-fe">Known problems with the llvm-gcc Ada front-end</a>
Chris Lattner2b659ef2008-02-12 06:29:45 +0000[diff] [blame]695</div>
696
697<div class="doc_text">
698The llvm-gcc 4.2 Ada compiler works fairly well, however this is not a mature
699technology and problems should be expected.
700<ul>
Duncan Sands27aff872008-06-08 20:18:35 +0000[diff] [blame]701<li>The Ada front-end currently only builds on X86-32. This is mainly due
Chris Lattner2b659ef2008-02-12 06:29:45 +0000[diff] [blame]702to lack of trampoline support (pointers to nested functions) on other platforms,
Duncan Sands27aff872008-06-08 20:18:35 +0000[diff] [blame]703however it <a href="http://llvm.org/PR2006">also fails to build on X86-64</a>
Chris Lattner2b659ef2008-02-12 06:29:45 +0000[diff] [blame]704which does support trampolines.</li>
705<li>The Ada front-end <a href="http://llvm.org/PR2007">fails to bootstrap</a>.
Duncan Sands326a4982009-02-25 11:59:06 +0000[diff] [blame]706This is due to lack of LLVM support for <tt>setjmp</tt>/<tt>longjmp</tt> style
707exception handling, which is used internally by the compiler.
Chris Lattner2b659ef2008-02-12 06:29:45 +0000[diff] [blame]708Workaround: configure with --disable-bootstrap.</li>
Duncan Sands978bcee2008-10-13 17:27:23 +0000[diff] [blame]709<li>The c380004, <a href="http://llvm.org/PR2010">c393010</a>
710and <a href="http://llvm.org/PR2421">cxg2021</a> ACATS tests fail
Duncan Sands326a4982009-02-25 11:59:06 +0000[diff] [blame]711(c380004 also fails with gcc-4.2 mainline).
712If the compiler is built with checks disabled then <a href="http://llvm.org/PR2010">c393010</a>
713causes the compiler to go into an infinite loop, using up all system memory.</li>
Duncan Sands978bcee2008-10-13 17:27:23 +0000[diff] [blame]714<li>Some gcc specific Ada tests continue to crash the compiler.</li>
Chris Lattner2b659ef2008-02-12 06:29:45 +0000[diff] [blame]715<li>The -E binder option (exception backtraces)
716<a href="http://llvm.org/PR1982">does not work</a> and will result in programs
717crashing if an exception is raised. Workaround: do not use -E.</li>
718<li>Only discrete types <a href="http://llvm.org/PR1981">are allowed to start
719or finish at a non-byte offset</a> in a record. Workaround: do not pack records
720or use representation clauses that result in a field of a non-discrete type
721starting or finishing in the middle of a byte.</li>
Chris Lattnere6e1b352008-06-08 21:19:07 +0000[diff] [blame]722<li>The <tt>lli</tt> interpreter <a href="http://llvm.org/PR2009">considers
723'main' as generated by the Ada binder to be invalid</a>.
724Workaround: hand edit the file to use pointers for <tt>argv</tt> and
725<tt>envp</tt> rather than integers.</li>
726<li>The <tt>-fstack-check</tt> option <a href="http://llvm.org/PR2008">is
727ignored</a>.</li>
Chris Lattner2b659ef2008-02-12 06:29:45 +0000[diff] [blame]728</ul>
729</div>
730
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]731<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]732<div class="doc_section">
733 <a name="additionalinfo">Additional Information</a>
734</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]735<!-- *********************************************************************** -->
736
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]737<div class="doc_text">
738
Chris Lattner416db102005-05-16 17:13:10 +0000[diff] [blame]739<p>A wide variety of additional information is available on the <a
Chris Lattnerb4b0ce72007-05-18 00:44:29 +0000[diff] [blame]740href="http://llvm.org">LLVM web page</a>, in particular in the <a
741href="http://llvm.org/docs/">documentation</a> section. The web page also
Reid Spencer669ed452007-07-09 08:04:31 +0000[diff] [blame]742contains versions of the API documentation which is up-to-date with the
743Subversion version of the source code.
Misha Brukman109d9e82005-03-30 19:14:24 +0000[diff] [blame]744You can access versions of these documents specific to this release by going
745into the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]746
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]747<p>If you have any questions or comments about LLVM, please feel free to contact
Chris Lattnerc463b272005-10-29 07:07:09 +0000[diff] [blame]748us via the <a href="http://llvm.org/docs/#maillist"> mailing
Chris Lattner5eccca42003-12-12 21:22:16 +0000[diff] [blame]749lists</a>.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]750
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]751</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]752
753<!-- *********************************************************************** -->
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]754
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]755<hr>
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Chris Lattnerb4b0ce72007-05-18 00:44:29 +0000[diff] [blame]762 <a href="http://llvm.org/">LLVM Compiler Infrastructure</a><br>
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