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gerrit-public.fairphone.software / toolchain / llvm-project / 8547c2d56f3944d368b16868af8d073eace76299 / . / llvm / docs / ReleaseNotes.html
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4<head>
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Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]6 <link rel="stylesheet" href="llvm.css" type="text/css">
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]7 <title>LLVM 2.4 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 Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]11<div class="doc_title">LLVM 2.4 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>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]19 <li><a href="#knownproblems">Known Problems</a>
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">
Chris Lattnera69595e2005-10-29 07:07:09 +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
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 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
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 Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]51
52</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]53
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]54<!-- Unfinished features in 2.4:
Chris Lattner2b8a52e2008-02-10 07:46:44 +0000[diff] [blame]55 Machine LICM
56 Machine Sinking
57 LegalizeDAGTypes
Chris Lattnerc4d68542008-10-12 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 Lattner2b8a52e2008-02-10 07:46:44 +0000[diff] [blame]60 -->
Mikhail Glushenkov024f7cf2008-10-13 02:08:34 +0000[diff] [blame]61
Chris Lattnerc4d68542008-10-12 19:47:48 +0000[diff] [blame]62 <!-- for announcement email:
63 mention dev mtg
Chris Lattnere3df07e2008-10-12 22:57:58 +0000[diff] [blame]64 Xcode 3.1 and 3.1.1.
Chris Lattnerc4d68542008-10-12 19:47:48 +0000[diff] [blame]65 -->
Chris Lattner2b8a52e2008-02-10 07:46:44 +0000[diff] [blame]66
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]67<!-- *********************************************************************** -->
68<div class="doc_section">
69 <a name="subproj">Sub-project Status Update</a>
Chris Lattner625a3d82008-06-08 21:34:41 +0000[diff] [blame]70</div>
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]71<!-- *********************************************************************** -->
Chris Lattner625a3d82008-06-08 21:34:41 +0000[diff] [blame]72
73<div class="doc_text">
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]74<p>
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]75The LLVM 2.4 distribution currently consists of code from the core LLVM
Chris Lattner44c09cd2008-10-13 18:11:54 +0000[diff] [blame]76repository (which roughly includes the LLVM optimizers, code generators and
Chris Lattnerc75fd522008-06-08 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 Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]79are the most actively developed are the <a href="#clang">Clang Project</a> and
Duncan Sandsb34d5902008-10-13 18:33:28 +0000[diff] [blame]80the <a href="#vmkit">vmkit Project</a>.
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]81</p>
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]82
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]83</div>
84
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]85
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]86<!--=========================================================================-->
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]87<div class="doc_subsection">
Chris Lattner44c09cd2008-10-13 18:11:54 +0000[diff] [blame]88<a name="clang">Clang: C/C++/Objective-C Frontend Toolkit</a>
Chris Lattnerc75fd522008-06-08 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 Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]101<p>Codegen progress/state
102</p>
103
Chris Lattner44c09cd2008-10-13 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 Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]114<a href="http://clang.llvm.org/StaticAnalysis.html">static analysis tool</a>
Chris Lattner44c09cd2008-10-13 18:11:54 +0000[diff] [blame]115.</p>
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]116
117</div>
118
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]119<!--=========================================================================-->
120<div class="doc_subsection">
Chris Lattner44c09cd2008-10-13 18:11:54 +0000[diff] [blame]121<a name="vmkit">vmkit: JVM/CLI Virtual Machine Implementation</a>
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]122</div>
123
124<div class="doc_text">
125<p>
Chris Lattner44c09cd2008-10-13 18:11:54 +0000[diff] [blame]126The <a href="http://vmkit.llvm.org/">vmkit project</a> is an implementation of
Chris Lattnerf5cd9862008-10-13 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 Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]134
135<!-- *********************************************************************** -->
136<div class="doc_section">
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]137 <a name="whatsnew">What's New in LLVM?</a>
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]138</div>
139<!-- *********************************************************************** -->
140
Chris Lattnerb7bc2aa2008-06-08 22:59:35 +0000[diff] [blame]141<div class="doc_text">
142
Chris Lattner1e4d5bc2008-10-13 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 Lattnerb7bc2aa2008-06-08 22:59:35 +0000[diff] [blame]146</p>
147</div>
148
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]149<!--=========================================================================-->
Chris Lattner625a3d82008-06-08 21:34:41 +0000[diff] [blame]150<div class="doc_subsection">
Chris Lattnercdc44ed2008-02-06 18:00:06 +0000[diff] [blame]151<a name="majorfeatures">Major New Features</a>
152</div>
153
154<div class="doc_text">
155
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]156<p>LLVM 2.4 includes several major new capabilities:</p>
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]157
158<ul>
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]159<li>
Chris Lattner63969522008-10-12 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 Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]162 </li>
163
Chris Lattnerc4d68542008-10-12 19:47:48 +0000[diff] [blame]164<li><p>-O0 compile times overall much faster</p></li>
Mikhail Glushenkov024f7cf2008-10-13 02:08:34 +0000[diff] [blame]165
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]166<li><p>Attrs changes?</p></li>
Chris Lattner618a99f2008-06-05 06:57:39 +0000[diff] [blame]167
Chris Lattner63969522008-10-12 18:30:33 +0000[diff] [blame]168
169<li><p>Initial PIC16 port</p></li>
170
Chris Lattnerc4d68542008-10-12 19:47:48 +0000[diff] [blame]171<li><p> Support the rest of the atomic __sync builtins</p></li>
Chris Lattner63969522008-10-12 18:30:33 +0000[diff] [blame]172
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]173<li><p>...</p></li>
Chris Lattner618a99f2008-06-05 06:57:39 +0000[diff] [blame]174
Chris Lattner458e79f2008-02-10 08:18:42 +0000[diff] [blame]175</ul>
176
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]177</div>
178
Chris Lattnerb7112222008-06-05 06:25:56 +0000[diff] [blame]179
180<!--=========================================================================-->
181<div class="doc_subsection">
Chris Lattner625a3d82008-06-08 21:34:41 +0000[diff] [blame]182<a name="llvm-gcc">llvm-gcc 4.2 Improvements</a>
Chris Lattnerb7112222008-06-05 06:25:56 +0000[diff] [blame]183</div>
184
185<div class="doc_text">
186
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]187<p>LLVM 2.4 fully supports the llvm-gcc 4.2 front-end, and includes support
Chris Lattnerb7bc2aa2008-06-08 22:59:35 +0000[diff] [blame]188for the C, C++, Objective-C, Ada, and Fortran front-ends.</p>
Chris Lattnerb7112222008-06-05 06:25:56 +0000[diff] [blame]189
Chris Lattnerb7bc2aa2008-06-08 22:59:35 +0000[diff] [blame]190<p>
191<ul>
Duncan Sandsb34d5902008-10-13 18:33:28 +0000[diff] [blame]192<li>block-pointers<li>
193<li>alpha?<li>
194<li>-flimited-precision</li>
195<li>-flto</li>
Chris Lattnerb7bc2aa2008-06-08 22:59:35 +0000[diff] [blame]196
Gabor Greif7f39fb52008-06-09 06:06:18 +0000[diff] [blame]197</ul>
Chris Lattnerb7112222008-06-05 06:25:56 +0000[diff] [blame]198
Chris Lattnerb7112222008-06-05 06:25:56 +0000[diff] [blame]199</div>
200
201
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]202<!--=========================================================================-->
203<div class="doc_subsection">
Chris Lattnerdd6acc02008-02-10 08:17:19 +0000[diff] [blame]204<a name="coreimprovements">LLVM Core Improvements</a>
205</div>
206
207<div class="doc_text">
208<p>New features include:
209</p>
210
Chris Lattnerb7112222008-06-05 06:25:56 +0000[diff] [blame]211<ul>
Chris Lattnere3df07e2008-10-12 22:57:58 +0000[diff] [blame]212<li>vector shifts in the IR: no codegen support yet</li>
Chris Lattner63969522008-10-12 18:30:33 +0000[diff] [blame]213<li>use diet patch landed: saved 15% IR memory footprint</li>
214<li>LLVM IR now directly represents "common" linkage, instead of
215 representing it as a form of weak linkage.</li>
Chris Lattnerc4d68542008-10-12 19:47:48 +0000[diff] [blame]216<li>DebugInfoBuilder</li>
Chris Lattnere3df07e2008-10-12 22:57:58 +0000[diff] [blame]217<li>.ll printing format change: %3 = add i32 4, 2</li>
Duncan Sandsb34d5902008-10-13 18:33:28 +0000[diff] [blame]218<li>opt-size, noinline, alwaysinline function attributes</li>
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]219<li>...</li>
Chris Lattnerdd6acc02008-02-10 08:17:19 +0000[diff] [blame]220</ul>
Mikhail Glushenkov024f7cf2008-10-13 02:08:34 +0000[diff] [blame]221
Chris Lattnerdd6acc02008-02-10 08:17:19 +0000[diff] [blame]222</div>
223
224<!--=========================================================================-->
225<div class="doc_subsection">
Chris Lattner2b8a52e2008-02-10 07:46:44 +0000[diff] [blame]226<a name="optimizer">Optimizer Improvements</a>
227</div>
228
229<div class="doc_text">
230
Mikhail Glushenkov024f7cf2008-10-13 02:08:34 +0000[diff] [blame]231<p>In addition to a huge array of bug fixes and minor performance tweaks, the
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]232LLVM 2.4 optimizers support a few major enhancements:</p>
Chris Lattner2b8a52e2008-02-10 07:46:44 +0000[diff] [blame]233
234<ul>
235
Chris Lattnerc4d68542008-10-12 19:47:48 +0000[diff] [blame]236<li>GVN now does local PRE?</li>
237
238<li>Matthijs' Dead argument elimination rewrite</li>
239
Chris Lattner63969522008-10-12 18:30:33 +0000[diff] [blame]240<li>Old-ADCE used control dependence and deleted output-free infinite loops.
241Added a new Loop deletion pass (for deleting output free provably-finite loops)
242and rewrote ADCE to be simpler faster, and not need control dependence.</li>
243
244<li>SparsePropagation framework for lattice-based dataflow solvers.</li>
245
Chris Lattnere3df07e2008-10-12 22:57:58 +0000[diff] [blame]246<li>Tail duplication was removed from the standard optimizer sequence.</li>
Chris Lattner63969522008-10-12 18:30:33 +0000[diff] [blame]247
Chris Lattnerc4d68542008-10-12 19:47:48 +0000[diff] [blame]248<li>Various helper functions (ComputeMaskedBits, ComputeNumSignBits, etc) were
249pulled out of instcombine and put into a new ValueTracking.h file, where they
250can be reused by other passes.</li>
251
Duncan Sands8547c2d2008-10-13 18:42:43 +0000[diff] [blame^]252<li>The new AddReadAttrs pass works out which functions are read-only or
253read-none (these correspond to 'pure' and 'const' in C) and marks them
254with the appropriate attribute.</li>
Chris Lattner7795ea92008-06-08 02:45:07 +0000[diff] [blame]255</ul>
256
257</div>
258
259<!--=========================================================================-->
260<div class="doc_subsection">
261<a name="codegen">Code Generator Improvements</a>
262</div>
263
264<div class="doc_text">
265
266<p>We put a significant amount of work into the code generator infrastructure,
267which allows us to implement more aggressive algorithms and make it run
268faster:</p>
269
270<ul>
Chris Lattnere3df07e2008-10-12 22:57:58 +0000[diff] [blame]271<li>asm writers split out to their own library to avoid JITs having to link
272 them in.</li>
273<li>Big asm writer refactoring + TargetAsmInfo</li>
274<li>2-addr pass and coalescer can now remat trivial insts to avoid a copy.</li>
Chris Lattnerc4d68542008-10-12 19:47:48 +0000[diff] [blame]275<li>spiller to commute instructions in order to fold a reload</li>
276<li>Stack slot coloring?</li>
277<li>Live intervals renumbering? Is this useful to external people?</li>
278<li>'is as cheap as a move' instruction flag</li>
279<li>Improvements to selection dag viewing</li>
280<li>fast isel</li>
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]281<li>Selection dag speedups</li>
Chris Lattnerc4d68542008-10-12 19:47:48 +0000[diff] [blame]282<li>asmwriter + raw_ostream -> fastah</li>
Chris Lattner3fc6e592008-10-13 17:12:51 +0000[diff] [blame]283<li>Partitioned Boolean Quadratic Programming (PBQP) based register
284allocator.</li>
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]285<li>...</li>
Chris Lattner7795ea92008-06-08 02:45:07 +0000[diff] [blame]286
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]287</ul>
288
289</div>
290
291
292<!--=========================================================================-->
293<div class="doc_subsection">
Chris Lattner6cb64032008-06-05 08:02:49 +0000[diff] [blame]294<a name="x86specific">X86/X86-64 Specific Improvements</a>
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]295</div>
Chris Lattner727c3742007-05-18 06:33:02 +0000[diff] [blame]296
Chris Lattner89e761c2006-04-18 06:32:08 +0000[diff] [blame]297<div class="doc_text">
Chris Lattnerdd6acc02008-02-10 08:17:19 +0000[diff] [blame]298<p>New target-specific features include:
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]299</p>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]300
301<ul>
Chris Lattnerc4d68542008-10-12 19:47:48 +0000[diff] [blame]302<li>Exception handling is supported by default on Linux/x86-64.</li>
Duncan Sands719f7782008-10-13 17:32:15 +0000[diff] [blame]303<li>Position Independent Code (PIC) is now supported on Linux/x86-64.</li>
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]304<li>...</li>
Chris Lattnerb076b002008-06-08 21:19:07 +0000[diff] [blame]305
Chris Lattner8ce1ba42007-05-17 21:41:31 +0000[diff] [blame]306</ul>
Mikhail Glushenkov024f7cf2008-10-13 02:08:34 +0000[diff] [blame]307
Chris Lattner8ce1ba42007-05-17 21:41:31 +0000[diff] [blame]308</div>
Chris Lattner72a269f2006-03-03 00:34:26 +0000[diff] [blame]309
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]310<!--=========================================================================-->
311<div class="doc_subsection">
Chris Lattner6cb64032008-06-05 08:02:49 +0000[diff] [blame]312<a name="targetspecific">Other Target Specific Improvements</a>
313</div>
314
315<div class="doc_text">
316<p>New target-specific features include:
317</p>
318
319<ul>
Chris Lattnere3df07e2008-10-12 22:57:58 +0000[diff] [blame]320<li>MIPS floating point support?</li>
Duncan Sands719f7782008-10-13 17:32:15 +0000[diff] [blame]321<li>PowerPC now supports trampolines.</li>
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]322<li>....</li>
Chris Lattner6cb64032008-06-05 08:02:49 +0000[diff] [blame]323</ul>
Chris Lattner6cb64032008-06-05 08:02:49 +0000[diff] [blame]324
Mikhail Glushenkov024f7cf2008-10-13 02:08:34 +0000[diff] [blame]325</div>
Chris Lattner6cb64032008-06-05 08:02:49 +0000[diff] [blame]326
327
328<!--=========================================================================-->
329<div class="doc_subsection">
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]330<a name="otherimprovements">Other Improvements</a>
331</div>
332
333<div class="doc_text">
334<p>New features include:
335</p>
336
337<ul>
Mikhail Glushenkovd3ec89e2008-10-13 02:46:01 +0000[diff] [blame]338<li><tt>llvmc2</tt> (the generic compiler driver) gained plugin
Mikhail Glushenkov024f7cf2008-10-13 02:08:34 +0000[diff] [blame]339 support. It is now easier to experiment with <tt>llvmc2</tt> and
340 build your own tools based on it. </li>
Chris Lattnerc4d68542008-10-12 19:47:48 +0000[diff] [blame]341<li>raw_ostream + formatting</li>
Chris Lattnere3df07e2008-10-12 22:57:58 +0000[diff] [blame]342<li>Recycler + pool allocation stuff?</li>
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]343<li>...</li>
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]344</ul>
Mikhail Glushenkov024f7cf2008-10-13 02:08:34 +0000[diff] [blame]345
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]346</div>
Chris Lattner72a269f2006-03-03 00:34:26 +0000[diff] [blame]347
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]348<!--=========================================================================-->
349<div class="doc_subsection">
350<a name="changes">Major Changes and Removed Features</a>
351</div>
352
353<div class="doc_text">
354
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]355<p>If you're already an LLVM user, this section lists some "gotchas" that you
356may run into upgrading from the previous release.</p>
357
Duncan Sandsb34d5902008-10-13 18:33:28 +0000[diff] [blame]358<p>The LLVM IR generated by llvm-gcc no longer names all instructions.
359 Use the instnamer pass if you want everything named.</p>
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]360
Duncan Sandsb34d5902008-10-13 18:33:28 +0000[diff] [blame]361<li>The LoadVN and GCSE passes have been removed.</li>
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]362
363
364<p>LLVM API Changes:</p>
365
366<ul>
367
368<li>... Attributes changes ... </li>
369
370<li>The <tt>DbgStopPointInst</tt> methods <tt>getDirectory</tt> and
371<tt>getFileName</tt> now return <tt>Value*</tt> instead of strings. These can be
372converted to strings using <tt>llvm::GetConstantStringInfo</tt> defined via
373"llvm/Analysis/ValueTracking.h".</li>
374
375<li>API change: BinaryOperator::create -> Create (CmpInst, CastInst too)</li>
376<li>Various header files like "llvm/ADT/iterator" were given a .h suffix.
377 Change your code to #include "llvm/ADT/iterator.h" instead.</li>
378
379</ul>
380
381</div>
382
383
384
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]385<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]386<div class="doc_section">
387 <a name="portability">Portability and Supported Platforms</a>
388</div>
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]389<!-- *********************************************************************** -->
390
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]391<div class="doc_text">
392
John Criswell64307722004-12-08 20:35:47 +0000[diff] [blame]393<p>LLVM is known to work on the following platforms:</p>
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]394
395<ul>
Mikhail Glushenkov024f7cf2008-10-13 02:08:34 +0000[diff] [blame]396<li>Intel and AMD machines (IA32) running Red Hat Linux, Fedora Core and FreeBSD
Reid Spencer9803b402005-05-17 02:47:27 +0000[diff] [blame]397 (and probably other unix-like systems).</li>
Chris Lattner7422bce2008-02-06 06:30:34 +0000[diff] [blame]398<li>PowerPC and X86-based Mac OS X systems, running 10.3 and above in 32-bit and
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]399 64-bit modes.</li>
Chris Lattnercdc44ed2008-02-06 18:00:06 +0000[diff] [blame]400<li>Intel and AMD machines running on Win32 using MinGW libraries (native).</li>
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]401<li>Intel and AMD machines running on Win32 with the Cygwin libraries (limited
402 support is available for native builds with Visual C++).</li>
Gabor Greif80ae8a72008-06-05 18:39:01 +0000[diff] [blame]403<li>Sun UltraSPARC workstations running Solaris 10.</li>
John Criswelld5234922005-05-13 20:28:15 +0000[diff] [blame]404<li>Alpha-based machines running Debian GNU/Linux.</li>
Gabor Greif80ae8a72008-06-05 18:39:01 +0000[diff] [blame]405<li>Itanium-based (IA64) machines running Linux and HP-UX.</li>
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]406</ul>
407
Chris Lattner618a99f2008-06-05 06:57:39 +0000[diff] [blame]408<p>The core LLVM infrastructure uses GNU autoconf to adapt itself
Brian Gaekee3e557e2004-05-09 05:28:35 +0000[diff] [blame]409to the machine and operating system on which it is built. However, minor
410porting may be required to get LLVM to work on new platforms. We welcome your
411portability patches and reports of successful builds or error messages.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]412
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]413</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]414
415<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]416<div class="doc_section">
417 <a name="knownproblems">Known Problems</a>
418</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]419<!-- *********************************************************************** -->
420
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]421<div class="doc_text">
422
423<p>This section contains all known problems with the LLVM system, listed by
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]424component. As new problems are discovered, they will be added to these
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]425sections. If you run into a problem, please check the <a
Chris Lattnera69595e2005-10-29 07:07:09 +0000[diff] [blame]426href="http://llvm.org/bugs/">LLVM bug database</a> and submit a bug if
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]427there isn't already one.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]428
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]429</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]430
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]431<!-- ======================================================================= -->
432<div class="doc_subsection">
433 <a name="experimental">Experimental features included with this release</a>
434</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]435
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]436<div class="doc_text">
437
Misha Brukmanfa50a222004-05-12 21:46:05 +0000[diff] [blame]438<p>The following components of this LLVM release are either untested, known to
439be broken or unreliable, or are in early development. These components should
440not be relied on, and bugs should not be filed against them, but they may be
441useful 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]442components, please contact us on the <a
443href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVMdev list</a>.</p>
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]444
445<ul>
Chris Lattnere38ac152008-02-12 06:29:45 +0000[diff] [blame]446<li>The MSIL, IA64, Alpha, SPU, and MIPS backends are experimental.</li>
Duncan Sands56448462008-06-08 20:18:35 +0000[diff] [blame]447<li>The llc "<tt>-filetype=asm</tt>" (the default) is the only supported
Chris Lattner7422bce2008-02-06 06:30:34 +0000[diff] [blame]448 value for this option.</li>
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]449</ul>
450
451</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]452
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]453<!-- ======================================================================= -->
454<div class="doc_subsection">
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]455 <a name="x86-be">Known problems with the X86 back-end</a>
John Criswell3bdbd302005-11-08 21:11:33 +0000[diff] [blame]456</div>
457
458<div class="doc_text">
459
460<ul>
Anton Korobeynikov486c7d32008-06-08 10:24:13 +0000[diff] [blame]461 <li>The X86 backend does not yet support
462 all <a href="http://llvm.org/PR879">inline assembly that uses the X86
463 floating point stack</a>. It supports the 'f' and 't' constraints, but not
464 'u'.</li>
Chris Lattnerb076b002008-06-08 21:19:07 +0000[diff] [blame]465 <li>The X86 backend generates inefficient floating point code when configured
466 to generate code for systems that don't have SSE2.</li>
Duncan Sands0bc15262008-06-08 19:38:43 +0000[diff] [blame]467 <li>Win64 code generation wasn't widely tested. Everything should work, but we
Anton Korobeynikov486c7d32008-06-08 10:24:13 +0000[diff] [blame]468 expect small issues to happen. Also, llvm-gcc cannot build mingw64 runtime
469 currently due
470 to <a href="http://llvm.org/PR2255">several</a>
Chris Lattner54d12102008-06-08 23:12:47 +0000[diff] [blame]471 <a href="http://llvm.org/PR2257">bugs</a> due to lack of support for the
472 'u' inline assembly constraint and X87 floating point inline assembly.</li>
Dan Gohman721b3722008-06-08 23:05:11 +0000[diff] [blame]473 <li>The X86-64 backend does not yet support the LLVM IR instruction
474 <tt>va_arg</tt>. Currently, the llvm-gcc front-end supports variadic
475 argument constructs on X86-64 by lowering them manually.</li>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]476</ul>
477
478</div>
479
480<!-- ======================================================================= -->
481<div class="doc_subsection">
482 <a name="ppc-be">Known problems with the PowerPC back-end</a>
483</div>
484
485<div class="doc_text">
486
487<ul>
Nicolas Geoffray77d99502007-05-15 09:21:28 +0000[diff] [blame]488<li>The Linux PPC32/ABI support needs testing for the interpreter and static
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]489compilation, and lacks support for debug information.</li>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]490</ul>
491
492</div>
493
494<!-- ======================================================================= -->
495<div class="doc_subsection">
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]496 <a name="arm-be">Known problems with the ARM back-end</a>
497</div>
498
499<div class="doc_text">
500
501<ul>
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]502<li>Thumb mode works only on ARMv6 or higher processors. On sub-ARMv6
Duncan Sands47fc0a22007-09-26 15:59:54 +0000[diff] [blame]503processors, thumb programs can crash or produce wrong
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]504results (<a href="http://llvm.org/PR1388">PR1388</a>).</li>
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]505<li>Compilation for ARM Linux OABI (old ABI) is supported, but not fully tested.
506</li>
Chris Lattnerb076b002008-06-08 21:19:07 +0000[diff] [blame]507<li>There is a bug in QEMU-ARM (&lt;= 0.9.0) which causes it to incorrectly
508 execute
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]509programs compiled with LLVM. Please use more recent versions of QEMU.</li>
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]510</ul>
511
512</div>
513
514<!-- ======================================================================= -->
515<div class="doc_subsection">
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]516 <a name="sparc-be">Known problems with the SPARC back-end</a>
517</div>
518
519<div class="doc_text">
520
521<ul>
522<li>The SPARC backend only supports the 32-bit SPARC ABI (-m32), it does not
523 support the 64-bit SPARC ABI (-m64).</li>
524</ul>
525
526</div>
527
528<!-- ======================================================================= -->
529<div class="doc_subsection">
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]530 <a name="alpha-be">Known problems with the Alpha back-end</a>
531</div>
532
533<div class="doc_text">
534
535<ul>
536
537<li>On 21164s, some rare FP arithmetic sequences which may trap do not have the
538appropriate nops inserted to ensure restartability.</li>
539
John Criswell3bdbd302005-11-08 21:11:33 +0000[diff] [blame]540</ul>
541</div>
542
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]543<!-- ======================================================================= -->
544<div class="doc_subsection">
545 <a name="ia64-be">Known problems with the IA64 back-end</a>
546</div>
547
548<div class="doc_text">
549
550<ul>
Chris Lattner54d12102008-06-08 23:12:47 +0000[diff] [blame]551<li>The Itanium backend is highly experimental, and has a number of known
552 issues. We are looking for a maintainer for the Itanium backend. If you
553 are interested, please contact the llvmdev mailing list.</li>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]554</ul>
555
556</div>
557
558<!-- ======================================================================= -->
559<div class="doc_subsection">
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]560 <a name="c-be">Known problems with the C back-end</a>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]561</div>
562
563<div class="doc_text">
564
565<ul>
Chris Lattnera1a4c9a2008-06-05 06:35:40 +0000[diff] [blame]566<li><a href="http://llvm.org/PR802">The C backend has only basic support for
567 inline assembly code</a>.</li>
Chris Lattner8e061162007-09-26 06:01:35 +0000[diff] [blame]568<li><a href="http://llvm.org/PR1658">The C backend violates the ABI of common
569 C++ programs</a>, preventing intermixing between C++ compiled by the CBE and
Duncan Sands56448462008-06-08 20:18:35 +0000[diff] [blame]570 C++ code compiled with llc or native compilers.</li>
Duncan Sandse09506a2008-02-10 13:40:55 +0000[diff] [blame]571<li>The C backend does not support all exception handling constructs.</li>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]572</ul>
573
574</div>
John Criswell3bdbd302005-11-08 21:11:33 +0000[diff] [blame]575
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]576
577<!-- ======================================================================= -->
578<div class="doc_subsection">
Chris Lattnera1a4c9a2008-06-05 06:35:40 +0000[diff] [blame]579 <a name="c-fe">Known problems with the llvm-gcc C front-end</a>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]580</div>
Chris Lattner178f3db2003-10-02 05:07:23 +0000[diff] [blame]581
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]582<div class="doc_text">
Chris Lattner72a269f2006-03-03 00:34:26 +0000[diff] [blame]583
Chris Lattnercdc44ed2008-02-06 18:00:06 +0000[diff] [blame]584<p>llvm-gcc does not currently support <a href="http://llvm.org/PR869">Link-Time
585Optimization</a> on most platforms "out-of-the-box". Please inquire on the
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]586llvmdev mailing list if you are interested.</p>
Chris Lattner44124232006-08-08 17:27:28 +0000[diff] [blame]587
Chris Lattnera1a4c9a2008-06-05 06:35:40 +0000[diff] [blame]588<p>The only major language feature of GCC not supported by llvm-gcc is
589 the <tt>__builtin_apply</tt> family of builtins. However, some extensions
590 are only supported on some targets. For example, trampolines are only
Duncan Sands56448462008-06-08 20:18:35 +0000[diff] [blame]591 supported on some targets (these are used when you take the address of a
592 nested function).</p>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]593
Chris Lattnera1a4c9a2008-06-05 06:35:40 +0000[diff] [blame]594<p>If you run into GCC extensions which are not supported, please let us know.
595</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]596
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]597</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]598
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]599<!-- ======================================================================= -->
600<div class="doc_subsection">
Chris Lattnera1a4c9a2008-06-05 06:35:40 +0000[diff] [blame]601 <a name="c++-fe">Known problems with the llvm-gcc C++ front-end</a>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]602</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]603
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]604<div class="doc_text">
605
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]606<p>The C++ front-end is considered to be fully
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]607tested and works for a number of non-trivial programs, including LLVM
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]608itself, Qt, Mozilla, etc.</p>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]609
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]610<ul>
Anton Korobeynikov28f08aa2008-10-11 18:27:16 +0000[diff] [blame]611<li>Exception handling works well on the X86 and PowerPC targets. Currently
612 only linux and darwin targets are supported (both 32 and 64 bit).</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]613</ul>
Chris Lattner46ecf612003-10-07 22:14:37 +0000[diff] [blame]614
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]615</div>
616
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]617
Chris Lattnere38ac152008-02-12 06:29:45 +0000[diff] [blame]618<!-- ======================================================================= -->
619<div class="doc_subsection">
Chris Lattnera1a4c9a2008-06-05 06:35:40 +0000[diff] [blame]620 <a name="ada-fe">Known problems with the llvm-gcc Ada front-end</a>
Chris Lattnere38ac152008-02-12 06:29:45 +0000[diff] [blame]621</div>
622
623<div class="doc_text">
624The llvm-gcc 4.2 Ada compiler works fairly well, however this is not a mature
625technology and problems should be expected.
626<ul>
Duncan Sands56448462008-06-08 20:18:35 +0000[diff] [blame]627<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]628to lack of trampoline support (pointers to nested functions) on other platforms,
Duncan Sands56448462008-06-08 20:18:35 +0000[diff] [blame]629however 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]630which does support trampolines.</li>
631<li>The Ada front-end <a href="http://llvm.org/PR2007">fails to bootstrap</a>.
632Workaround: configure with --disable-bootstrap.</li>
Duncan Sandsaef747f2008-10-13 17:27:23 +0000[diff] [blame]633<li>The c380004, <a href="http://llvm.org/PR2010">c393010</a>
634and <a href="http://llvm.org/PR2421">cxg2021</a> ACATS tests fail
635(c380004 also fails with gcc-4.2 mainline).</li>
636<li>Some gcc specific Ada tests continue to crash the compiler.</li>
Chris Lattnere38ac152008-02-12 06:29:45 +0000[diff] [blame]637<li>The -E binder option (exception backtraces)
638<a href="http://llvm.org/PR1982">does not work</a> and will result in programs
639crashing if an exception is raised. Workaround: do not use -E.</li>
640<li>Only discrete types <a href="http://llvm.org/PR1981">are allowed to start
641or finish at a non-byte offset</a> in a record. Workaround: do not pack records
642or use representation clauses that result in a field of a non-discrete type
643starting or finishing in the middle of a byte.</li>
Chris Lattnerb076b002008-06-08 21:19:07 +0000[diff] [blame]644<li>The <tt>lli</tt> interpreter <a href="http://llvm.org/PR2009">considers
645'main' as generated by the Ada binder to be invalid</a>.
646Workaround: hand edit the file to use pointers for <tt>argv</tt> and
647<tt>envp</tt> rather than integers.</li>
648<li>The <tt>-fstack-check</tt> option <a href="http://llvm.org/PR2008">is
649ignored</a>.</li>
Chris Lattnere38ac152008-02-12 06:29:45 +0000[diff] [blame]650</ul>
651</div>
652
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]653<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]654<div class="doc_section">
655 <a name="additionalinfo">Additional Information</a>
656</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]657<!-- *********************************************************************** -->
658
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]659<div class="doc_text">
660
Chris Lattnercb5596d2005-05-16 17:13:10 +0000[diff] [blame]661<p>A wide variety of additional information is available on the <a
Chris Lattnere0c1df42007-05-18 00:44:29 +0000[diff] [blame]662href="http://llvm.org">LLVM web page</a>, in particular in the <a
663href="http://llvm.org/docs/">documentation</a> section. The web page also
Reid Spencerc7f87f22007-07-09 08:04:31 +0000[diff] [blame]664contains versions of the API documentation which is up-to-date with the
665Subversion version of the source code.
Misha Brukman96158092005-03-30 19:14:24 +0000[diff] [blame]666You can access versions of these documents specific to this release by going
667into the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]668
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]669<p>If you have any questions or comments about LLVM, please feel free to contact
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