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gerrit-public.fairphone.software / fp2-dev / platform / external / llvm / fb97b2dd340494ef7c2159d47aa202f9209a0ad4 / . / docs / ReleaseNotes.html
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Chris Lattner857fb132008-10-11 18:18:28 +0000[diff] [blame]7 <title>LLVM 2.4 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 Lattner857fb132008-10-11 18:18:28 +0000[diff] [blame]11<div class="doc_title">LLVM 2.4 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>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]19 <li><a href="#knownproblems">Known Problems</a>
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">
Chris Lattnerc463b272005-10-29 07:07:09 +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
36Infrastructure, release 2.4. Here we describe the status of LLVM, including
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
49current one. To see the release notes for a specific releases, please see the
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 Lattner857fb132008-10-11 18:18:28 +0000[diff] [blame]54<!-- Unfinished features in 2.4:
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]55 Machine LICM
56 Machine Sinking
57 LegalizeDAGTypes
Chris Lattner547a3912008-10-12 19:47:48 +0000[diff] [blame]58 llc -enable-value-prop, propagation of value info (sign/zero ext info) from
59 one MBB to another
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]60 -->
Mikhail Glushenkovea65d7d2008-10-13 02:08:34 +0000[diff] [blame]61
Chris Lattner547a3912008-10-12 19:47:48 +0000[diff] [blame]62 <!-- for announcement email:
63 mention dev mtg
Chris Lattnercdb0e4c2008-10-12 22:57:58 +0000[diff] [blame]64 Xcode 3.1 and 3.1.1.
Chris Lattner547a3912008-10-12 19:47:48 +0000[diff] [blame]65 -->
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]66
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]67<!-- *********************************************************************** -->
68<div class="doc_section">
69 <a name="subproj">Sub-project Status Update</a>
Chris Lattnerea34f642008-06-08 21:34:41 +0000[diff] [blame]70</div>
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]71<!-- *********************************************************************** -->
Chris Lattnerea34f642008-06-08 21:34:41 +0000[diff] [blame]72
73<div class="doc_text">
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]74<p>
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]75The LLVM 2.4 distribution currently consists of code from the core LLVM
Chris Lattnerfb97b2d2008-10-13 18:11:54 +0000[diff] [blame^]76repository (which roughly includes the LLVM optimizers, code generators and
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]77supporting tools) and the llvm-gcc repository. In addition to this code, the
78LLVM Project includes other sub-projects that are in development. The two which
Chris Lattner857fb132008-10-11 18:18:28 +0000[diff] [blame]79are the most actively developed are the <a href="#clang">Clang Project</a> and
Mikhail Glushenkovea65d7d2008-10-13 02:08:34 +0000[diff] [blame]80<a href="#vmkit">vmkit Project</a>.
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]81</p>
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]82
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]83</div>
84
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]85
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]86<!--=========================================================================-->
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]87<div class="doc_subsection">
Chris Lattnerfb97b2d2008-10-13 18:11:54 +0000[diff] [blame^]88<a name="clang">Clang: C/C++/Objective-C Frontend Toolkit</a>
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]89</div>
90
91<div class="doc_text">
92
93<p>The <a href="http://clang.llvm.org/">Clang project</a> is an effort to build
94a set of new 'LLVM native' front-end technologies for the LLVM optimizer
95and code generator. Clang is continuing to make major strides forward in all
96areas. Its C and Objective-C parsing support is very solid, and the code
97generation support is far enough along to build many C applications. While not
98yet production quality, it is progressing very nicely. In addition, C++
99front-end work has started to make significant progress.</p>
100
Chris Lattner857fb132008-10-11 18:18:28 +0000[diff] [blame]101<p>Codegen progress/state
102</p>
103
Chris Lattnerfb97b2d2008-10-13 18:11:54 +0000[diff] [blame^]104</div>
105
106<!--=========================================================================-->
107<div class="doc_subsection">
108<a name="clangsa">Clang Static Analyzer</a>
109</div>
110
111<div class="doc_text">
112
113<p>The
Chris Lattner857fb132008-10-11 18:18:28 +0000[diff] [blame]114<a href="http://clang.llvm.org/StaticAnalysis.html">static analysis tool</a>
Chris Lattnerfb97b2d2008-10-13 18:11:54 +0000[diff] [blame^]115.</p>
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]116
117</div>
118
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]119<!--=========================================================================-->
120<div class="doc_subsection">
Chris Lattnerfb97b2d2008-10-13 18:11:54 +0000[diff] [blame^]121<a name="vmkit">vmkit: JVM/CLI Virtual Machine Implementation</a>
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]122</div>
123
124<div class="doc_text">
125<p>
Chris Lattnerfb97b2d2008-10-13 18:11:54 +0000[diff] [blame^]126The <a href="http://vmkit.llvm.org/">vmkit project</a> is an implementation of
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]127a JVM and a CLI Virtual Machines (Microsoft .NET is an
128implementation of the CLI) using the Just-In-Time compiler of LLVM.</p>
129
130<p>...</p>
131
132</div>
133
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]134
135<!-- *********************************************************************** -->
136<div class="doc_section">
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]137 <a name="whatsnew">What's New in LLVM?</a>
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]138</div>
139<!-- *********************************************************************** -->
140
Chris Lattnerf8e0b4e2008-06-08 22:59:35 +0000[diff] [blame]141<div class="doc_text">
142
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]143<p>This release includes a huge number of bug fixes, performance tweaks and
144minor improvements. Some of the major improvements and new features are listed
145in this section.
Chris Lattnerf8e0b4e2008-06-08 22:59:35 +0000[diff] [blame]146</p>
147</div>
148
Chris Lattner8348b472008-06-08 21:58:17 +0000[diff] [blame]149<!--=========================================================================-->
Chris Lattnerea34f642008-06-08 21:34:41 +0000[diff] [blame]150<div class="doc_subsection">
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]151<a name="majorfeatures">Major New Features</a>
152</div>
153
154<div class="doc_text">
155
Chris Lattner857fb132008-10-11 18:18:28 +0000[diff] [blame]156<p>LLVM 2.4 includes several major new capabilities:</p>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]157
158<ul>
Chris Lattner857fb132008-10-11 18:18:28 +0000[diff] [blame]159<li>
Chris Lattnercce6d4b2008-10-12 18:30:33 +0000[diff] [blame]160 <p>MRVs got generalized to FCAs. getresult is gone, ret with multiple values
161 is gone.</p>
Chris Lattner857fb132008-10-11 18:18:28 +0000[diff] [blame]162 </li>
163
Chris Lattner547a3912008-10-12 19:47:48 +0000[diff] [blame]164<li><p>-O0 compile times overall much faster</p></li>
Mikhail Glushenkovea65d7d2008-10-13 02:08:34 +0000[diff] [blame]165
Chris Lattner857fb132008-10-11 18:18:28 +0000[diff] [blame]166<li><p>Attrs changes?</p></li>
Chris Lattnerbc5786b2008-06-05 06:57:39 +0000[diff] [blame]167
Chris Lattnercce6d4b2008-10-12 18:30:33 +0000[diff] [blame]168
169<li><p>Initial PIC16 port</p></li>
170
Chris Lattner547a3912008-10-12 19:47:48 +0000[diff] [blame]171<li><p> Support the rest of the atomic __sync builtins</p></li>
Chris Lattnercce6d4b2008-10-12 18:30:33 +0000[diff] [blame]172
Chris Lattner857fb132008-10-11 18:18:28 +0000[diff] [blame]173<li><p>...</p></li>
Chris Lattnerbc5786b2008-06-05 06:57:39 +0000[diff] [blame]174
Chris Lattner8170c102008-02-10 08:18:42 +0000[diff] [blame]175</ul>
176
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]177</div>
178
Chris Lattner791f77b2008-06-05 06:25:56 +0000[diff] [blame]179
180<!--=========================================================================-->
181<div class="doc_subsection">
Chris Lattnerea34f642008-06-08 21:34:41 +0000[diff] [blame]182<a name="llvm-gcc">llvm-gcc 4.2 Improvements</a>
Chris Lattner791f77b2008-06-05 06:25:56 +0000[diff] [blame]183</div>
184
185<div class="doc_text">
186
Chris Lattner857fb132008-10-11 18:18:28 +0000[diff] [blame]187<p>LLVM 2.4 fully supports the llvm-gcc 4.2 front-end, and includes support
Chris Lattnerf8e0b4e2008-06-08 22:59:35 +0000[diff] [blame]188for the C, C++, Objective-C, Ada, and Fortran front-ends.</p>
Chris Lattner791f77b2008-06-05 06:25:56 +0000[diff] [blame]189
Chris Lattnerf8e0b4e2008-06-08 22:59:35 +0000[diff] [blame]190<p>
191<ul>
Chris Lattner857fb132008-10-11 18:18:28 +0000[diff] [blame]192<li>...</li>
Chris Lattnerf8e0b4e2008-06-08 22:59:35 +0000[diff] [blame]193
Gabor Greifa3bd11d2008-06-09 06:06:18 +0000[diff] [blame]194</ul>
Chris Lattner791f77b2008-06-05 06:25:56 +0000[diff] [blame]195
Chris Lattner791f77b2008-06-05 06:25:56 +0000[diff] [blame]196</div>
197
198
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]199<!--=========================================================================-->
200<div class="doc_subsection">
Chris Lattnerf304ffc2008-02-10 08:17:19 +0000[diff] [blame]201<a name="coreimprovements">LLVM Core Improvements</a>
202</div>
203
204<div class="doc_text">
205<p>New features include:
206</p>
207
Chris Lattner791f77b2008-06-05 06:25:56 +0000[diff] [blame]208<ul>
Chris Lattnercdb0e4c2008-10-12 22:57:58 +0000[diff] [blame]209<li>vector shifts in the IR: no codegen support yet</li>
Chris Lattnercce6d4b2008-10-12 18:30:33 +0000[diff] [blame]210<li>use diet patch landed: saved 15% IR memory footprint</li>
211<li>LLVM IR now directly represents "common" linkage, instead of
212 representing it as a form of weak linkage.</li>
Chris Lattner547a3912008-10-12 19:47:48 +0000[diff] [blame]213<li>DebugInfoBuilder</li>
Chris Lattnercdb0e4c2008-10-12 22:57:58 +0000[diff] [blame]214<li>.ll printing format change: %3 = add i32 4, 2</li>
Chris Lattner857fb132008-10-11 18:18:28 +0000[diff] [blame]215<li>...</li>
Chris Lattnerf304ffc2008-02-10 08:17:19 +0000[diff] [blame]216</ul>
Mikhail Glushenkovea65d7d2008-10-13 02:08:34 +0000[diff] [blame]217
Chris Lattnerf304ffc2008-02-10 08:17:19 +0000[diff] [blame]218</div>
219
220<!--=========================================================================-->
221<div class="doc_subsection">
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]222<a name="optimizer">Optimizer Improvements</a>
223</div>
224
225<div class="doc_text">
226
Mikhail Glushenkovea65d7d2008-10-13 02:08:34 +0000[diff] [blame]227<p>In addition to a huge array of bug fixes and minor performance tweaks, the
Chris Lattner857fb132008-10-11 18:18:28 +0000[diff] [blame]228LLVM 2.4 optimizers support a few major enhancements:</p>
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]229
230<ul>
231
Chris Lattner547a3912008-10-12 19:47:48 +0000[diff] [blame]232<li>GVN now does local PRE?</li>
233
234<li>Matthijs' Dead argument elimination rewrite</li>
235
Chris Lattnercce6d4b2008-10-12 18:30:33 +0000[diff] [blame]236<li>Old-ADCE used control dependence and deleted output-free infinite loops.
237Added a new Loop deletion pass (for deleting output free provably-finite loops)
238and rewrote ADCE to be simpler faster, and not need control dependence.</li>
239
240<li>SparsePropagation framework for lattice-based dataflow solvers.</li>
241
Chris Lattnercdb0e4c2008-10-12 22:57:58 +0000[diff] [blame]242<li>Tail duplication was removed from the standard optimizer sequence.</li>
Chris Lattnercce6d4b2008-10-12 18:30:33 +0000[diff] [blame]243
Chris Lattner547a3912008-10-12 19:47:48 +0000[diff] [blame]244<li>Various helper functions (ComputeMaskedBits, ComputeNumSignBits, etc) were
245pulled out of instcombine and put into a new ValueTracking.h file, where they
246can be reused by other passes.</li>
247
Chris Lattnercdb0e4c2008-10-12 22:57:58 +0000[diff] [blame]248<li>MarkModRef etc</li>
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]249</ul>
250
251</div>
252
253<!--=========================================================================-->
254<div class="doc_subsection">
255<a name="codegen">Code Generator Improvements</a>
256</div>
257
258<div class="doc_text">
259
260<p>We put a significant amount of work into the code generator infrastructure,
261which allows us to implement more aggressive algorithms and make it run
262faster:</p>
263
264<ul>
Chris Lattnercdb0e4c2008-10-12 22:57:58 +0000[diff] [blame]265<li>asm writers split out to their own library to avoid JITs having to link
266 them in.</li>
267<li>Big asm writer refactoring + TargetAsmInfo</li>
268<li>2-addr pass and coalescer can now remat trivial insts to avoid a copy.</li>
Chris Lattner547a3912008-10-12 19:47:48 +0000[diff] [blame]269<li>spiller to commute instructions in order to fold a reload</li>
270<li>Stack slot coloring?</li>
271<li>Live intervals renumbering? Is this useful to external people?</li>
272<li>'is as cheap as a move' instruction flag</li>
273<li>Improvements to selection dag viewing</li>
274<li>fast isel</li>
Chris Lattner857fb132008-10-11 18:18:28 +0000[diff] [blame]275<li>Selection dag speedups</li>
Chris Lattner547a3912008-10-12 19:47:48 +0000[diff] [blame]276<li>asmwriter + raw_ostream -> fastah</li>
Chris Lattner59b5ce42008-10-13 17:12:51 +0000[diff] [blame]277<li>Partitioned Boolean Quadratic Programming (PBQP) based register
278allocator.</li>
Chris Lattner857fb132008-10-11 18:18:28 +0000[diff] [blame]279<li>...</li>
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]280
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]281</ul>
282
283</div>
284
285
286<!--=========================================================================-->
287<div class="doc_subsection">
Chris Lattner77d29b12008-06-05 08:02:49 +0000[diff] [blame]288<a name="x86specific">X86/X86-64 Specific Improvements</a>
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]289</div>
Chris Lattner60893e52007-05-18 06:33:02 +0000[diff] [blame]290
Chris Lattner738bd302006-04-18 06:32:08 +0000[diff] [blame]291<div class="doc_text">
Chris Lattnerf304ffc2008-02-10 08:17:19 +0000[diff] [blame]292<p>New target-specific features include:
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]293</p>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]294
295<ul>
Chris Lattner547a3912008-10-12 19:47:48 +0000[diff] [blame]296<li>Exception handling is supported by default on Linux/x86-64.</li>
Duncan Sandsbbf379a2008-10-13 17:32:15 +0000[diff] [blame]297<li>Position Independent Code (PIC) is now supported on Linux/x86-64.</li>
Chris Lattner857fb132008-10-11 18:18:28 +0000[diff] [blame]298<li>...</li>
Chris Lattnere6e1b352008-06-08 21:19:07 +0000[diff] [blame]299
Chris Lattnerbfb17ab2007-05-17 21:41:31 +0000[diff] [blame]300</ul>
Mikhail Glushenkovea65d7d2008-10-13 02:08:34 +0000[diff] [blame]301
Chris Lattnerbfb17ab2007-05-17 21:41:31 +0000[diff] [blame]302</div>
Chris Lattnerc5d658a2006-03-03 00:34:26 +0000[diff] [blame]303
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]304<!--=========================================================================-->
305<div class="doc_subsection">
Chris Lattner77d29b12008-06-05 08:02:49 +0000[diff] [blame]306<a name="targetspecific">Other Target Specific Improvements</a>
307</div>
308
309<div class="doc_text">
310<p>New target-specific features include:
311</p>
312
313<ul>
Chris Lattnercdb0e4c2008-10-12 22:57:58 +0000[diff] [blame]314<li>MIPS floating point support?</li>
Duncan Sandsbbf379a2008-10-13 17:32:15 +0000[diff] [blame]315<li>PowerPC now supports trampolines.</li>
Chris Lattner857fb132008-10-11 18:18:28 +0000[diff] [blame]316<li>....</li>
Chris Lattner77d29b12008-06-05 08:02:49 +0000[diff] [blame]317</ul>
Chris Lattner77d29b12008-06-05 08:02:49 +0000[diff] [blame]318
Mikhail Glushenkovea65d7d2008-10-13 02:08:34 +0000[diff] [blame]319</div>
Chris Lattner77d29b12008-06-05 08:02:49 +0000[diff] [blame]320
321
322<!--=========================================================================-->
323<div class="doc_subsection">
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]324<a name="otherimprovements">Other Improvements</a>
325</div>
326
327<div class="doc_text">
328<p>New features include:
329</p>
330
331<ul>
Mikhail Glushenkov49feb452008-10-13 02:46:01 +0000[diff] [blame]332<li><tt>llvmc2</tt> (the generic compiler driver) gained plugin
Mikhail Glushenkovea65d7d2008-10-13 02:08:34 +0000[diff] [blame]333 support. It is now easier to experiment with <tt>llvmc2</tt> and
334 build your own tools based on it. </li>
Chris Lattner547a3912008-10-12 19:47:48 +0000[diff] [blame]335<li>raw_ostream + formatting</li>
Chris Lattnercdb0e4c2008-10-12 22:57:58 +0000[diff] [blame]336<li>Recycler + pool allocation stuff?</li>
Chris Lattner857fb132008-10-11 18:18:28 +0000[diff] [blame]337<li>...</li>
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]338</ul>
Mikhail Glushenkovea65d7d2008-10-13 02:08:34 +0000[diff] [blame]339
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]340</div>
Chris Lattnerc5d658a2006-03-03 00:34:26 +0000[diff] [blame]341
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]342<!--=========================================================================-->
343<div class="doc_subsection">
344<a name="changes">Major Changes and Removed Features</a>
345</div>
346
347<div class="doc_text">
348
Chris Lattner96a445e2008-10-13 18:01:01 +0000[diff] [blame]349<p>If you're already an LLVM user, this section lists some "gotchas" that you
350may run into upgrading from the previous release.</p>
351
Chris Lattnerf6662f92008-10-13 17:57:36 +0000[diff] [blame]352<p>The LLVM IR generated by llvm-gcc now doesn't name instructions. Use the
353 instnamer pass if you want them.</p>
354
355<li>LoadVN and GCSE are completely gone.</li>
356
357
358<p>LLVM API Changes:</p>
359
360<ul>
361
362<li>... Attributes changes ... </li>
363
364<li>The <tt>DbgStopPointInst</tt> methods <tt>getDirectory</tt> and
365<tt>getFileName</tt> now return <tt>Value*</tt> instead of strings. These can be
366converted to strings using <tt>llvm::GetConstantStringInfo</tt> defined via
367"llvm/Analysis/ValueTracking.h".</li>
368
369<li>API change: BinaryOperator::create -> Create (CmpInst, CastInst too)</li>
370<li>Various header files like "llvm/ADT/iterator" were given a .h suffix.
371 Change your code to #include "llvm/ADT/iterator.h" instead.</li>
372
373</ul>
374
375</div>
376
377
378
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]379<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]380<div class="doc_section">
381 <a name="portability">Portability and Supported Platforms</a>
382</div>
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]383<!-- *********************************************************************** -->
384
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]385<div class="doc_text">
386
John Criswell0b5b5e92004-12-08 20:35:47 +0000[diff] [blame]387<p>LLVM is known to work on the following platforms:</p>
Chris Lattner4654bdb2004-06-01 18:22:41 +0000[diff] [blame]388
389<ul>
Mikhail Glushenkovea65d7d2008-10-13 02:08:34 +0000[diff] [blame]390<li>Intel and AMD machines (IA32) running Red Hat Linux, Fedora Core and FreeBSD
Reid Spencer00812e22005-05-17 02:47:27 +0000[diff] [blame]391 (and probably other unix-like systems).</li>
Chris Lattner000c73b2008-02-06 06:30:34 +0000[diff] [blame]392<li>PowerPC and X86-based Mac OS X systems, running 10.3 and above in 32-bit and
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]393 64-bit modes.</li>
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]394<li>Intel and AMD machines running on Win32 using MinGW libraries (native).</li>
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]395<li>Intel and AMD machines running on Win32 with the Cygwin libraries (limited
396 support is available for native builds with Visual C++).</li>
Gabor Greif96a89c72008-06-05 18:39:01 +0000[diff] [blame]397<li>Sun UltraSPARC workstations running Solaris 10.</li>
John Criswell9321fa82005-05-13 20:28:15 +0000[diff] [blame]398<li>Alpha-based machines running Debian GNU/Linux.</li>
Gabor Greif96a89c72008-06-05 18:39:01 +0000[diff] [blame]399<li>Itanium-based (IA64) machines running Linux and HP-UX.</li>
Chris Lattner4654bdb2004-06-01 18:22:41 +0000[diff] [blame]400</ul>
401
Chris Lattnerbc5786b2008-06-05 06:57:39 +0000[diff] [blame]402<p>The core LLVM infrastructure uses GNU autoconf to adapt itself
Brian Gaekeb0fd7612004-05-09 05:28:35 +0000[diff] [blame]403to the machine and operating system on which it is built. However, minor
404porting may be required to get LLVM to work on new platforms. We welcome your
405portability patches and reports of successful builds or error messages.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]406
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]407</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]408
409<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]410<div class="doc_section">
411 <a name="knownproblems">Known Problems</a>
412</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]413<!-- *********************************************************************** -->
414
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]415<div class="doc_text">
416
417<p>This section contains all known problems with the LLVM system, listed by
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]418component. As new problems are discovered, they will be added to these
Chris Lattner5eccca42003-12-12 21:22:16 +0000[diff] [blame]419sections. If you run into a problem, please check the <a
Chris Lattnerc463b272005-10-29 07:07:09 +0000[diff] [blame]420href="http://llvm.org/bugs/">LLVM bug database</a> and submit a bug if
Chris Lattner5eccca42003-12-12 21:22:16 +0000[diff] [blame]421there isn't already one.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]422
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]423</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]424
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]425<!-- ======================================================================= -->
426<div class="doc_subsection">
427 <a name="experimental">Experimental features included with this release</a>
428</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]429
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]430<div class="doc_text">
431
Misha Brukman6df9e2c2004-05-12 21:46:05 +0000[diff] [blame]432<p>The following components of this LLVM release are either untested, known to
433be broken or unreliable, or are in early development. These components should
434not be relied on, and bugs should not be filed against them, but they may be
435useful 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]436components, please contact us on the <a
437href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVMdev list</a>.</p>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]438
439<ul>
Chris Lattner2b659ef2008-02-12 06:29:45 +0000[diff] [blame]440<li>The MSIL, IA64, Alpha, SPU, and MIPS backends are experimental.</li>
Duncan Sands27aff872008-06-08 20:18:35 +0000[diff] [blame]441<li>The llc "<tt>-filetype=asm</tt>" (the default) is the only supported
Chris Lattner000c73b2008-02-06 06:30:34 +0000[diff] [blame]442 value for this option.</li>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]443</ul>
444
445</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]446
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]447<!-- ======================================================================= -->
448<div class="doc_subsection">
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]449 <a name="x86-be">Known problems with the X86 back-end</a>
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]450</div>
451
452<div class="doc_text">
453
454<ul>
Anton Korobeynikova6094be2008-06-08 10:24:13 +0000[diff] [blame]455 <li>The X86 backend does not yet support
456 all <a href="http://llvm.org/PR879">inline assembly that uses the X86
457 floating point stack</a>. It supports the 'f' and 't' constraints, but not
458 'u'.</li>
Chris Lattnere6e1b352008-06-08 21:19:07 +0000[diff] [blame]459 <li>The X86 backend generates inefficient floating point code when configured
460 to generate code for systems that don't have SSE2.</li>
Duncan Sands47eff2b2008-06-08 19:38:43 +0000[diff] [blame]461 <li>Win64 code generation wasn't widely tested. Everything should work, but we
Anton Korobeynikova6094be2008-06-08 10:24:13 +0000[diff] [blame]462 expect small issues to happen. Also, llvm-gcc cannot build mingw64 runtime
463 currently due
464 to <a href="http://llvm.org/PR2255">several</a>
Chris Lattner04af7cb2008-06-08 23:12:47 +0000[diff] [blame]465 <a href="http://llvm.org/PR2257">bugs</a> due to lack of support for the
466 'u' inline assembly constraint and X87 floating point inline assembly.</li>
Dan Gohman8207ba92008-06-08 23:05:11 +0000[diff] [blame]467 <li>The X86-64 backend does not yet support the LLVM IR instruction
468 <tt>va_arg</tt>. Currently, the llvm-gcc front-end supports variadic
469 argument constructs on X86-64 by lowering them manually.</li>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]470</ul>
471
472</div>
473
474<!-- ======================================================================= -->
475<div class="doc_subsection">
476 <a name="ppc-be">Known problems with the PowerPC back-end</a>
477</div>
478
479<div class="doc_text">
480
481<ul>
Nicolas Geoffraye4285dc2007-05-15 09:21:28 +0000[diff] [blame]482<li>The Linux PPC32/ABI support needs testing for the interpreter and static
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]483compilation, and lacks support for debug information.</li>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]484</ul>
485
486</div>
487
488<!-- ======================================================================= -->
489<div class="doc_subsection">
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]490 <a name="arm-be">Known problems with the ARM back-end</a>
491</div>
492
493<div class="doc_text">
494
495<ul>
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]496<li>Thumb mode works only on ARMv6 or higher processors. On sub-ARMv6
Duncan Sandsc90d68b2007-09-26 15:59:54 +0000[diff] [blame]497processors, thumb programs can crash or produce wrong
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]498results (<a href="http://llvm.org/PR1388">PR1388</a>).</li>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]499<li>Compilation for ARM Linux OABI (old ABI) is supported, but not fully tested.
500</li>
Chris Lattnere6e1b352008-06-08 21:19:07 +0000[diff] [blame]501<li>There is a bug in QEMU-ARM (&lt;= 0.9.0) which causes it to incorrectly
502 execute
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]503programs compiled with LLVM. Please use more recent versions of QEMU.</li>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]504</ul>
505
506</div>
507
508<!-- ======================================================================= -->
509<div class="doc_subsection">
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]510 <a name="sparc-be">Known problems with the SPARC back-end</a>
511</div>
512
513<div class="doc_text">
514
515<ul>
516<li>The SPARC backend only supports the 32-bit SPARC ABI (-m32), it does not
517 support the 64-bit SPARC ABI (-m64).</li>
518</ul>
519
520</div>
521
522<!-- ======================================================================= -->
523<div class="doc_subsection">
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]524 <a name="alpha-be">Known problems with the Alpha back-end</a>
525</div>
526
527<div class="doc_text">
528
529<ul>
530
531<li>On 21164s, some rare FP arithmetic sequences which may trap do not have the
532appropriate nops inserted to ensure restartability.</li>
533
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]534</ul>
535</div>
536
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]537<!-- ======================================================================= -->
538<div class="doc_subsection">
539 <a name="ia64-be">Known problems with the IA64 back-end</a>
540</div>
541
542<div class="doc_text">
543
544<ul>
Chris Lattner04af7cb2008-06-08 23:12:47 +0000[diff] [blame]545<li>The Itanium backend is highly experimental, and has a number of known
546 issues. We are looking for a maintainer for the Itanium backend. If you
547 are interested, please contact the llvmdev mailing list.</li>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]548</ul>
549
550</div>
551
552<!-- ======================================================================= -->
553<div class="doc_subsection">
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]554 <a name="c-be">Known problems with the C back-end</a>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]555</div>
556
557<div class="doc_text">
558
559<ul>
Chris Lattner5733b272008-06-05 06:35:40 +0000[diff] [blame]560<li><a href="http://llvm.org/PR802">The C backend has only basic support for
561 inline assembly code</a>.</li>
Chris Lattner725a0d82007-09-26 06:01:35 +0000[diff] [blame]562<li><a href="http://llvm.org/PR1658">The C backend violates the ABI of common
563 C++ programs</a>, preventing intermixing between C++ compiled by the CBE and
Duncan Sands27aff872008-06-08 20:18:35 +0000[diff] [blame]564 C++ code compiled with llc or native compilers.</li>
Duncan Sandsf74c0cc2008-02-10 13:40:55 +0000[diff] [blame]565<li>The C backend does not support all exception handling constructs.</li>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]566</ul>
567
568</div>
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]569
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]570
571<!-- ======================================================================= -->
572<div class="doc_subsection">
Chris Lattner5733b272008-06-05 06:35:40 +0000[diff] [blame]573 <a name="c-fe">Known problems with the llvm-gcc C front-end</a>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]574</div>
Chris Lattner47588f92003-10-02 05:07:23 +0000[diff] [blame]575
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]576<div class="doc_text">
Chris Lattnerc5d658a2006-03-03 00:34:26 +0000[diff] [blame]577
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]578<p>llvm-gcc does not currently support <a href="http://llvm.org/PR869">Link-Time
579Optimization</a> on most platforms "out-of-the-box". Please inquire on the
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]580llvmdev mailing list if you are interested.</p>
Chris Lattnerd9ea0172006-08-08 17:27:28 +0000[diff] [blame]581
Chris Lattner5733b272008-06-05 06:35:40 +0000[diff] [blame]582<p>The only major language feature of GCC not supported by llvm-gcc is
583 the <tt>__builtin_apply</tt> family of builtins. However, some extensions
584 are only supported on some targets. For example, trampolines are only
Duncan Sands27aff872008-06-08 20:18:35 +0000[diff] [blame]585 supported on some targets (these are used when you take the address of a
586 nested function).</p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]587
Chris Lattner5733b272008-06-05 06:35:40 +0000[diff] [blame]588<p>If you run into GCC extensions which are not supported, please let us know.
589</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]590
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]591</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]592
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]593<!-- ======================================================================= -->
594<div class="doc_subsection">
Chris Lattner5733b272008-06-05 06:35:40 +0000[diff] [blame]595 <a name="c++-fe">Known problems with the llvm-gcc C++ front-end</a>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]596</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]597
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]598<div class="doc_text">
599
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]600<p>The C++ front-end is considered to be fully
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame]601tested and works for a number of non-trivial programs, including LLVM
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]602itself, Qt, Mozilla, etc.</p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]603
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]604<ul>
Anton Korobeynikov0021fc12008-10-11 18:27:16 +0000[diff] [blame]605<li>Exception handling works well on the X86 and PowerPC targets. Currently
606 only linux and darwin targets are supported (both 32 and 64 bit).</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]607</ul>
Chris Lattnerfcc54b32003-10-07 22:14:37 +0000[diff] [blame]608
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]609</div>
610
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]611
Chris Lattner2b659ef2008-02-12 06:29:45 +0000[diff] [blame]612<!-- ======================================================================= -->
613<div class="doc_subsection">
Chris Lattner5733b272008-06-05 06:35:40 +0000[diff] [blame]614 <a name="ada-fe">Known problems with the llvm-gcc Ada front-end</a>
Chris Lattner2b659ef2008-02-12 06:29:45 +0000[diff] [blame]615</div>
616
617<div class="doc_text">
618The llvm-gcc 4.2 Ada compiler works fairly well, however this is not a mature
619technology and problems should be expected.
620<ul>
Duncan Sands27aff872008-06-08 20:18:35 +0000[diff] [blame]621<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]622to lack of trampoline support (pointers to nested functions) on other platforms,
Duncan Sands27aff872008-06-08 20:18:35 +0000[diff] [blame]623however 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]624which does support trampolines.</li>
625<li>The Ada front-end <a href="http://llvm.org/PR2007">fails to bootstrap</a>.
626Workaround: configure with --disable-bootstrap.</li>
Duncan Sands978bcee2008-10-13 17:27:23 +0000[diff] [blame]627<li>The c380004, <a href="http://llvm.org/PR2010">c393010</a>
628and <a href="http://llvm.org/PR2421">cxg2021</a> ACATS tests fail
629(c380004 also fails with gcc-4.2 mainline).</li>
630<li>Some gcc specific Ada tests continue to crash the compiler.</li>
Chris Lattner2b659ef2008-02-12 06:29:45 +0000[diff] [blame]631<li>The -E binder option (exception backtraces)
632<a href="http://llvm.org/PR1982">does not work</a> and will result in programs
633crashing if an exception is raised. Workaround: do not use -E.</li>
634<li>Only discrete types <a href="http://llvm.org/PR1981">are allowed to start
635or finish at a non-byte offset</a> in a record. Workaround: do not pack records
636or use representation clauses that result in a field of a non-discrete type
637starting or finishing in the middle of a byte.</li>
Chris Lattnere6e1b352008-06-08 21:19:07 +0000[diff] [blame]638<li>The <tt>lli</tt> interpreter <a href="http://llvm.org/PR2009">considers
639'main' as generated by the Ada binder to be invalid</a>.
640Workaround: hand edit the file to use pointers for <tt>argv</tt> and
641<tt>envp</tt> rather than integers.</li>
642<li>The <tt>-fstack-check</tt> option <a href="http://llvm.org/PR2008">is
643ignored</a>.</li>
Chris Lattner2b659ef2008-02-12 06:29:45 +0000[diff] [blame]644</ul>
645</div>
646
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]647<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]648<div class="doc_section">
649 <a name="additionalinfo">Additional Information</a>
650</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]651<!-- *********************************************************************** -->
652
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]653<div class="doc_text">
654
Chris Lattner416db102005-05-16 17:13:10 +0000[diff] [blame]655<p>A wide variety of additional information is available on the <a
Chris Lattnerb4b0ce72007-05-18 00:44:29 +0000[diff] [blame]656href="http://llvm.org">LLVM web page</a>, in particular in the <a
657href="http://llvm.org/docs/">documentation</a> section. The web page also
Reid Spencer669ed452007-07-09 08:04:31 +0000[diff] [blame]658contains versions of the API documentation which is up-to-date with the
659Subversion version of the source code.
Misha Brukman109d9e82005-03-30 19:14:24 +0000[diff] [blame]660You can access versions of these documents specific to this release by going
661into the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]662
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]663<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]664us via the <a href="http://llvm.org/docs/#maillist"> mailing
Chris Lattner5eccca42003-12-12 21:22:16 +0000[diff] [blame]665lists</a>.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]666
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]667</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]668
669<!-- *********************************************************************** -->
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]670
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