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gerrit-public.fairphone.software / toolchain / llvm-project / c52af453045285f38db199d91dbb4b0e2f21a780 / . / llvm / docs / ReleaseNotes.html
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Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]1<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
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4<head>
Reid Spencere4190fa2004-11-18 18:38:58 +0000[diff] [blame]5 <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]6 <link rel="stylesheet" href="llvm.css" type="text/css">
Chris 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>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]12
13<ol>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]14 <li><a href="#intro">Introduction</a></li>
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]15 <li><a href="#changes">Major Changes and Sub-project Status</a></li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]16 <li><a href="#whatsnew">What's New?</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
35<p>This document contains the release notes for the LLVM compiler
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]36infrastructure, release 2.4. Here we describe the status of LLVM, including
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]37major improvements from the previous release and any known problems. All LLVM
Chris Lattner98a33492007-05-09 04:58:11 +0000[diff] [blame]38releases may be downloaded from the <a href="http://llvm.org/releases/">LLVM
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]39releases 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
44href="http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVM developer's mailing
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]45list</a> is a good place to send them.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]46
Reid Spencerc7f87f22007-07-09 08:04:31 +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
54<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]55<div class="doc_section">
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]56 <a name="changes">Major Changes and Sub-project Status</a>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]57</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]58<!-- *********************************************************************** -->
59
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]60<div class="doc_text">
61
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]62<p>This is the fifteenth public release of the LLVM Compiler Infrastructure.
63It includes a large number of features and refinements from LLVM 2.3.</p>
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]64
Chris Lattner21a90402004-05-24 04:50:25 +0000[diff] [blame]65</div>
66
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]67<!-- Unfinished features in 2.4:
Chris Lattner2b8a52e2008-02-10 07:46:44 +0000[diff] [blame]68 Machine LICM
69 Machine Sinking
70 LegalizeDAGTypes
Chris Lattnerc4d68542008-10-12 19:47:48 +0000[diff] [blame]71 llc -enable-value-prop, propagation of value info (sign/zero ext info) from
72 one MBB to another
Chris Lattner2b8a52e2008-02-10 07:46:44 +0000[diff] [blame]73 -->
Chris Lattnerc4d68542008-10-12 19:47:48 +0000[diff] [blame]74
75 <!-- for announcement email:
76 mention dev mtg
Chris Lattnere3df07e2008-10-12 22:57:58 +0000[diff] [blame]77 Xcode 3.1 and 3.1.1.
Chris Lattnerc4d68542008-10-12 19:47:48 +0000[diff] [blame]78 -->
Chris Lattner2b8a52e2008-02-10 07:46:44 +0000[diff] [blame]79
Chris Lattnerba7bd472003-12-06 20:22:41 +0000[diff] [blame]80<!--=========================================================================-->
Chris Lattner406bddf2005-05-15 05:44:51 +0000[diff] [blame]81<div class="doc_subsection">
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]82<a name="changes">Major Changes in LLVM 2.4</a>
Chris Lattnera2735862008-02-10 07:04:35 +0000[diff] [blame]83</div>
84
85<div class="doc_text">
86
Chris Lattnerc4d68542008-10-12 19:47:48 +0000[diff] [blame]87<p>The LLVM IR generated by llvm-gcc now doesn't name instructions. Use the
88 instnamer pass if you want them.</p>
89
Chris Lattnere3df07e2008-10-12 22:57:58 +0000[diff] [blame]90<li>LoadVN and GCSE are completely gone.</li>
Chris Lattnerc4d68542008-10-12 19:47:48 +0000[diff] [blame]91
Chris Lattnerb076b002008-06-08 21:19:07 +0000[diff] [blame]92
Chris Lattner7795ea92008-06-08 02:45:07 +0000[diff] [blame]93<p>LLVM API Changes:</p>
Chris Lattner6cb64032008-06-05 08:02:49 +0000[diff] [blame]94
Chris Lattner7795ea92008-06-08 02:45:07 +0000[diff] [blame]95<ul>
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]96<li>....</li>
Daniel Dunbara4a08132008-10-11 21:26:56 +0000[diff] [blame]97
98<li>... Attributes changes ... </li>
99
Chris Lattner63969522008-10-12 18:30:33 +0000[diff] [blame]100<li>The <tt>DbgStopPointInst</tt> methods <tt>getDirectory</tt> and
101<tt>getFileName</tt> now return <tt>Value*</tt> instead of strings. These can be
102converted to strings using <tt>llvm::GetConstantStringInfo</tt> defined via
103"llvm/Analysis/ValueTracking.h".</li>
Daniel Dunbara4a08132008-10-11 21:26:56 +0000[diff] [blame]104
Chris Lattner63969522008-10-12 18:30:33 +0000[diff] [blame]105<li>API change: BinaryOperator::create -> Create (CmpInst, CastInst too)</li>
Chris Lattnerc4d68542008-10-12 19:47:48 +0000[diff] [blame]106<li>Various header files like "llvm/ADT/iterator" were given a .h suffix.
107 Change your code to #include "llvm/ADT/iterator.h" instead.</li>
Chris Lattnere3df07e2008-10-12 22:57:58 +0000[diff] [blame]108
Chris Lattner7795ea92008-06-08 02:45:07 +0000[diff] [blame]109</ul>
Chris Lattnere3df07e2008-10-12 22:57:58 +0000[diff] [blame]110
Chris Lattnercdc44ed2008-02-06 18:00:06 +0000[diff] [blame]111</div>
112
113<!--=========================================================================-->
114<div class="doc_subsection">
Chris Lattner625a3d82008-06-08 21:34:41 +0000[diff] [blame]115<a name="otherprojects">Other LLVM Sub-Projects</a>
116</div>
117
118<div class="doc_text">
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]119<p>
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]120The core LLVM 2.4 distribution currently consists of code from the core LLVM
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]121repository (which roughly contains the LLVM optimizer, code generators and
122supporting tools) and the llvm-gcc repository. In addition to this code, the
123LLVM Project includes other sub-projects that are in development. The two which
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]124are the most actively developed are the <a href="#clang">Clang Project</a> and
125<a href="#vmkit">vmkit Project</a>.
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]126</p>
127</div>
128
129<!--=========================================================================-->
130<div class="doc_subsubsection">
131<a name="vmkit">vmkit</a>
132</div>
133
134<div class="doc_text">
135<p>
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]136The <a href="http://vmkit.llvm.org/">"vmkit" project</a> is an implementation of
137a JVM and a CLI Virtual Machines (Microsoft .NET is an
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]138implementation of the CLI) using the Just-In-Time compiler of LLVM.</p>
139
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]140<p>...</p>
Chris Lattner625a3d82008-06-08 21:34:41 +0000[diff] [blame]141
142</div>
143
144<!--=========================================================================-->
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]145<div class="doc_subsubsection">
146<a name="clang">Clang</a>
147</div>
148
149<div class="doc_text">
150
151<p>The <a href="http://clang.llvm.org/">Clang project</a> is an effort to build
152a set of new 'LLVM native' front-end technologies for the LLVM optimizer
153and code generator. Clang is continuing to make major strides forward in all
154areas. Its C and Objective-C parsing support is very solid, and the code
155generation support is far enough along to build many C applications. While not
156yet production quality, it is progressing very nicely. In addition, C++
157front-end work has started to make significant progress.</p>
158
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]159<p>Codegen progress/state
160</p>
161
162<p>
163<a href="http://clang.llvm.org/StaticAnalysis.html">static analysis tool</a>
164</p>
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]165
166</div>
167
168
169<!-- *********************************************************************** -->
170<div class="doc_section">
171 <a name="whatsnew">What's New?</a>
172</div>
173<!-- *********************************************************************** -->
174
Chris Lattnerb7bc2aa2008-06-08 22:59:35 +0000[diff] [blame]175<div class="doc_text">
176
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]177<p>LLVM 2.4 includes a huge number of bug fixes, performance tweaks and minor
Chris Lattnerb7bc2aa2008-06-08 22:59:35 +0000[diff] [blame]178improvements. Some of the major improvements and new features are listed in
179this section.
180</p>
181</div>
182
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]183<!--=========================================================================-->
Chris Lattner625a3d82008-06-08 21:34:41 +0000[diff] [blame]184<div class="doc_subsection">
Chris Lattnercdc44ed2008-02-06 18:00:06 +0000[diff] [blame]185<a name="majorfeatures">Major New Features</a>
186</div>
187
188<div class="doc_text">
189
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]190<p>LLVM 2.4 includes several major new capabilities:</p>
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]191
192<ul>
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]193<li>
Chris Lattner63969522008-10-12 18:30:33 +0000[diff] [blame]194 <p>MRVs got generalized to FCAs. getresult is gone, ret with multiple values
195 is gone.</p>
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]196 </li>
197
Chris Lattnerc4d68542008-10-12 19:47:48 +0000[diff] [blame]198<li><p>-O0 compile times overall much faster</p></li>
Chris Lattner625a3d82008-06-08 21:34:41 +0000[diff] [blame]199
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]200<li><p>Attrs changes?</p></li>
Chris Lattner618a99f2008-06-05 06:57:39 +0000[diff] [blame]201
Chris Lattner63969522008-10-12 18:30:33 +0000[diff] [blame]202
203<li><p>Initial PIC16 port</p></li>
204
Chris Lattnerc4d68542008-10-12 19:47:48 +0000[diff] [blame]205<li><p> Support the rest of the atomic __sync builtins</p></li>
Chris Lattner63969522008-10-12 18:30:33 +0000[diff] [blame]206
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]207<li><p>...</p></li>
Chris Lattner618a99f2008-06-05 06:57:39 +0000[diff] [blame]208
Chris Lattner458e79f2008-02-10 08:18:42 +0000[diff] [blame]209</ul>
210
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]211</div>
212
Chris Lattnerb7112222008-06-05 06:25:56 +0000[diff] [blame]213
214<!--=========================================================================-->
215<div class="doc_subsection">
Chris Lattner625a3d82008-06-08 21:34:41 +0000[diff] [blame]216<a name="llvm-gcc">llvm-gcc 4.2 Improvements</a>
Chris Lattnerb7112222008-06-05 06:25:56 +0000[diff] [blame]217</div>
218
219<div class="doc_text">
220
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]221<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]222for the C, C++, Objective-C, Ada, and Fortran front-ends.</p>
Chris Lattnerb7112222008-06-05 06:25:56 +0000[diff] [blame]223
Chris Lattnerb7bc2aa2008-06-08 22:59:35 +0000[diff] [blame]224<p>
225<ul>
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]226<li>...</li>
Chris Lattnerb7bc2aa2008-06-08 22:59:35 +0000[diff] [blame]227
Gabor Greif7f39fb52008-06-09 06:06:18 +0000[diff] [blame]228</ul>
Chris Lattnerb7112222008-06-05 06:25:56 +0000[diff] [blame]229
Chris Lattnerb7112222008-06-05 06:25:56 +0000[diff] [blame]230</div>
231
232
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]233<!--=========================================================================-->
234<div class="doc_subsection">
Chris Lattnerdd6acc02008-02-10 08:17:19 +0000[diff] [blame]235<a name="coreimprovements">LLVM Core Improvements</a>
236</div>
237
238<div class="doc_text">
239<p>New features include:
240</p>
241
Chris Lattnerb7112222008-06-05 06:25:56 +0000[diff] [blame]242<ul>
Chris Lattnere3df07e2008-10-12 22:57:58 +0000[diff] [blame]243<li>vector shifts in the IR: no codegen support yet</li>
Chris Lattner63969522008-10-12 18:30:33 +0000[diff] [blame]244<li>use diet patch landed: saved 15% IR memory footprint</li>
245<li>LLVM IR now directly represents "common" linkage, instead of
246 representing it as a form of weak linkage.</li>
Chris Lattnerc4d68542008-10-12 19:47:48 +0000[diff] [blame]247<li>DebugInfoBuilder</li>
Chris Lattnere3df07e2008-10-12 22:57:58 +0000[diff] [blame]248<li>.ll printing format change: %3 = add i32 4, 2</li>
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]249<li>...</li>
Chris Lattnerdd6acc02008-02-10 08:17:19 +0000[diff] [blame]250</ul>
251
252</div>
253
254<!--=========================================================================-->
255<div class="doc_subsection">
Chris Lattner2b8a52e2008-02-10 07:46:44 +0000[diff] [blame]256<a name="optimizer">Optimizer Improvements</a>
257</div>
258
259<div class="doc_text">
260
Chris Lattnerdd6acc02008-02-10 08:17:19 +0000[diff] [blame]261<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]262LLVM 2.4 optimizers support a few major enhancements:</p>
Chris Lattner2b8a52e2008-02-10 07:46:44 +0000[diff] [blame]263
264<ul>
265
Chris Lattnerc4d68542008-10-12 19:47:48 +0000[diff] [blame]266<li>GVN now does local PRE?</li>
267
268<li>Matthijs' Dead argument elimination rewrite</li>
269
Chris Lattner63969522008-10-12 18:30:33 +0000[diff] [blame]270<li>Old-ADCE used control dependence and deleted output-free infinite loops.
271Added a new Loop deletion pass (for deleting output free provably-finite loops)
272and rewrote ADCE to be simpler faster, and not need control dependence.</li>
273
274<li>SparsePropagation framework for lattice-based dataflow solvers.</li>
275
Chris Lattnere3df07e2008-10-12 22:57:58 +0000[diff] [blame]276<li>Tail duplication was removed from the standard optimizer sequence.</li>
Chris Lattner63969522008-10-12 18:30:33 +0000[diff] [blame]277
Chris Lattnerc4d68542008-10-12 19:47:48 +0000[diff] [blame]278<li>Various helper functions (ComputeMaskedBits, ComputeNumSignBits, etc) were
279pulled out of instcombine and put into a new ValueTracking.h file, where they
280can be reused by other passes.</li>
281
Chris Lattnere3df07e2008-10-12 22:57:58 +0000[diff] [blame]282<li>MarkModRef etc</li>
Chris Lattner7795ea92008-06-08 02:45:07 +0000[diff] [blame]283</ul>
284
285</div>
286
287<!--=========================================================================-->
288<div class="doc_subsection">
289<a name="codegen">Code Generator Improvements</a>
290</div>
291
292<div class="doc_text">
293
294<p>We put a significant amount of work into the code generator infrastructure,
295which allows us to implement more aggressive algorithms and make it run
296faster:</p>
297
298<ul>
Chris Lattnere3df07e2008-10-12 22:57:58 +0000[diff] [blame]299<li>asm writers split out to their own library to avoid JITs having to link
300 them in.</li>
301<li>Big asm writer refactoring + TargetAsmInfo</li>
302<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]303<li>spiller to commute instructions in order to fold a reload</li>
304<li>Stack slot coloring?</li>
305<li>Live intervals renumbering? Is this useful to external people?</li>
306<li>'is as cheap as a move' instruction flag</li>
307<li>Improvements to selection dag viewing</li>
308<li>fast isel</li>
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]309<li>Selection dag speedups</li>
Chris Lattnerc4d68542008-10-12 19:47:48 +0000[diff] [blame]310<li>asmwriter + raw_ostream -> fastah</li>
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]311<li>...</li>
Chris Lattner7795ea92008-06-08 02:45:07 +0000[diff] [blame]312
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]313</ul>
314
315</div>
316
317
318<!--=========================================================================-->
319<div class="doc_subsection">
Chris Lattner6cb64032008-06-05 08:02:49 +0000[diff] [blame]320<a name="x86specific">X86/X86-64 Specific Improvements</a>
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]321</div>
Chris Lattner727c3742007-05-18 06:33:02 +0000[diff] [blame]322
Chris Lattner89e761c2006-04-18 06:32:08 +0000[diff] [blame]323<div class="doc_text">
Chris Lattnerdd6acc02008-02-10 08:17:19 +0000[diff] [blame]324<p>New target-specific features include:
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]325</p>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]326
327<ul>
Chris Lattnerc4d68542008-10-12 19:47:48 +0000[diff] [blame]328<li>Exception handling is supported by default on Linux/x86-64.</li>
329<li>Position Independent Code (PIC) is now support on Linux/x86-64.</li>
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]330<li>...</li>
Chris Lattnerb076b002008-06-08 21:19:07 +0000[diff] [blame]331
Chris Lattner8ce1ba42007-05-17 21:41:31 +0000[diff] [blame]332</ul>
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]333
Chris Lattner8ce1ba42007-05-17 21:41:31 +0000[diff] [blame]334</div>
Chris Lattner72a269f2006-03-03 00:34:26 +0000[diff] [blame]335
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]336<!--=========================================================================-->
337<div class="doc_subsection">
Chris Lattner6cb64032008-06-05 08:02:49 +0000[diff] [blame]338<a name="targetspecific">Other Target Specific Improvements</a>
339</div>
340
341<div class="doc_text">
342<p>New target-specific features include:
343</p>
344
345<ul>
Chris Lattnere3df07e2008-10-12 22:57:58 +0000[diff] [blame]346<li>MIPS floating point support?</li>
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]347<li>....</li>
Chris Lattner6cb64032008-06-05 08:02:49 +0000[diff] [blame]348</ul>
349
350</div>
351
352
353
354<!--=========================================================================-->
355<div class="doc_subsection">
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]356<a name="otherimprovements">Other Improvements</a>
357</div>
358
359<div class="doc_text">
360<p>New features include:
361</p>
362
363<ul>
Chris Lattnerc4d68542008-10-12 19:47:48 +0000[diff] [blame]364<li>raw_ostream + formatting</li>
Chris Lattnere3df07e2008-10-12 22:57:58 +0000[diff] [blame]365<li>Recycler + pool allocation stuff?</li>
Chris Lattnerd8b33e02008-10-11 18:18:28 +0000[diff] [blame]366<li>...</li>
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]367</ul>
368
369</div>
Chris Lattner72a269f2006-03-03 00:34:26 +0000[diff] [blame]370
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]371<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]372<div class="doc_section">
373 <a name="portability">Portability and Supported Platforms</a>
374</div>
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]375<!-- *********************************************************************** -->
376
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]377<div class="doc_text">
378
John Criswell64307722004-12-08 20:35:47 +0000[diff] [blame]379<p>LLVM is known to work on the following platforms:</p>
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]380
381<ul>
Gabor Greif80ae8a72008-06-05 18:39:01 +0000[diff] [blame]382<li>Intel and AMD machines (IA32) running Red Hat Linux, Fedora Core and FreeBSD
Reid Spencer9803b402005-05-17 02:47:27 +0000[diff] [blame]383 (and probably other unix-like systems).</li>
Chris Lattner7422bce2008-02-06 06:30:34 +0000[diff] [blame]384<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]385 64-bit modes.</li>
Chris Lattnercdc44ed2008-02-06 18:00:06 +0000[diff] [blame]386<li>Intel and AMD machines running on Win32 using MinGW libraries (native).</li>
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]387<li>Intel and AMD machines running on Win32 with the Cygwin libraries (limited
388 support is available for native builds with Visual C++).</li>
Gabor Greif80ae8a72008-06-05 18:39:01 +0000[diff] [blame]389<li>Sun UltraSPARC workstations running Solaris 10.</li>
John Criswelld5234922005-05-13 20:28:15 +0000[diff] [blame]390<li>Alpha-based machines running Debian GNU/Linux.</li>
Gabor Greif80ae8a72008-06-05 18:39:01 +0000[diff] [blame]391<li>Itanium-based (IA64) machines running Linux and HP-UX.</li>
Chris Lattner2c7b0872004-06-01 18:22:41 +0000[diff] [blame]392</ul>
393
Chris Lattner618a99f2008-06-05 06:57:39 +0000[diff] [blame]394<p>The core LLVM infrastructure uses GNU autoconf to adapt itself
Brian Gaekee3e557e2004-05-09 05:28:35 +0000[diff] [blame]395to the machine and operating system on which it is built. However, minor
396porting may be required to get LLVM to work on new platforms. We welcome your
397portability patches and reports of successful builds or error messages.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]398
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]399</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]400
401<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]402<div class="doc_section">
403 <a name="knownproblems">Known Problems</a>
404</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]405<!-- *********************************************************************** -->
406
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]407<div class="doc_text">
408
409<p>This section contains all known problems with the LLVM system, listed by
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]410component. As new problems are discovered, they will be added to these
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]411sections. If you run into a problem, please check the <a
Chris Lattnera69595e2005-10-29 07:07:09 +0000[diff] [blame]412href="http://llvm.org/bugs/">LLVM bug database</a> and submit a bug if
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]413there isn't already one.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]414
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]415</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]416
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]417<!-- ======================================================================= -->
418<div class="doc_subsection">
419 <a name="experimental">Experimental features included with this release</a>
420</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]421
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]422<div class="doc_text">
423
Misha Brukmanfa50a222004-05-12 21:46:05 +0000[diff] [blame]424<p>The following components of this LLVM release are either untested, known to
425be broken or unreliable, or are in early development. These components should
426not be relied on, and bugs should not be filed against them, but they may be
427useful 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]428components, please contact us on the <a
429href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVMdev list</a>.</p>
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]430
431<ul>
Chris Lattnere38ac152008-02-12 06:29:45 +0000[diff] [blame]432<li>The MSIL, IA64, Alpha, SPU, and MIPS backends are experimental.</li>
Duncan Sands56448462008-06-08 20:18:35 +0000[diff] [blame]433<li>The llc "<tt>-filetype=asm</tt>" (the default) is the only supported
Chris Lattner7422bce2008-02-06 06:30:34 +0000[diff] [blame]434 value for this option.</li>
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]435</ul>
436
437</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]438
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]439<!-- ======================================================================= -->
440<div class="doc_subsection">
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]441 <a name="x86-be">Known problems with the X86 back-end</a>
John Criswell3bdbd302005-11-08 21:11:33 +0000[diff] [blame]442</div>
443
444<div class="doc_text">
445
446<ul>
Anton Korobeynikov486c7d32008-06-08 10:24:13 +0000[diff] [blame]447 <li>The X86 backend does not yet support
448 all <a href="http://llvm.org/PR879">inline assembly that uses the X86
449 floating point stack</a>. It supports the 'f' and 't' constraints, but not
450 'u'.</li>
Chris Lattnerb076b002008-06-08 21:19:07 +0000[diff] [blame]451 <li>The X86 backend generates inefficient floating point code when configured
452 to generate code for systems that don't have SSE2.</li>
Duncan Sands0bc15262008-06-08 19:38:43 +0000[diff] [blame]453 <li>Win64 code generation wasn't widely tested. Everything should work, but we
Anton Korobeynikov486c7d32008-06-08 10:24:13 +0000[diff] [blame]454 expect small issues to happen. Also, llvm-gcc cannot build mingw64 runtime
455 currently due
456 to <a href="http://llvm.org/PR2255">several</a>
Chris Lattner54d12102008-06-08 23:12:47 +0000[diff] [blame]457 <a href="http://llvm.org/PR2257">bugs</a> due to lack of support for the
458 'u' inline assembly constraint and X87 floating point inline assembly.</li>
Dan Gohman721b3722008-06-08 23:05:11 +0000[diff] [blame]459 <li>The X86-64 backend does not yet support the LLVM IR instruction
460 <tt>va_arg</tt>. Currently, the llvm-gcc front-end supports variadic
461 argument constructs on X86-64 by lowering them manually.</li>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]462</ul>
463
464</div>
465
466<!-- ======================================================================= -->
467<div class="doc_subsection">
468 <a name="ppc-be">Known problems with the PowerPC back-end</a>
469</div>
470
471<div class="doc_text">
472
473<ul>
Nicolas Geoffray77d99502007-05-15 09:21:28 +0000[diff] [blame]474<li>The Linux PPC32/ABI support needs testing for the interpreter and static
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]475compilation, and lacks support for debug information.</li>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]476</ul>
477
478</div>
479
480<!-- ======================================================================= -->
481<div class="doc_subsection">
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]482 <a name="arm-be">Known problems with the ARM back-end</a>
483</div>
484
485<div class="doc_text">
486
487<ul>
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]488<li>Thumb mode works only on ARMv6 or higher processors. On sub-ARMv6
Duncan Sands47fc0a22007-09-26 15:59:54 +0000[diff] [blame]489processors, thumb programs can crash or produce wrong
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]490results (<a href="http://llvm.org/PR1388">PR1388</a>).</li>
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]491<li>Compilation for ARM Linux OABI (old ABI) is supported, but not fully tested.
492</li>
Chris Lattnerb076b002008-06-08 21:19:07 +0000[diff] [blame]493<li>There is a bug in QEMU-ARM (&lt;= 0.9.0) which causes it to incorrectly
494 execute
Chris Lattnerbee7b322007-05-23 04:39:32 +0000[diff] [blame]495programs compiled with LLVM. Please use more recent versions of QEMU.</li>
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]496</ul>
497
498</div>
499
500<!-- ======================================================================= -->
501<div class="doc_subsection">
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]502 <a name="sparc-be">Known problems with the SPARC back-end</a>
503</div>
504
505<div class="doc_text">
506
507<ul>
508<li>The SPARC backend only supports the 32-bit SPARC ABI (-m32), it does not
509 support the 64-bit SPARC ABI (-m64).</li>
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="alpha-be">Known problems with the Alpha back-end</a>
517</div>
518
519<div class="doc_text">
520
521<ul>
522
523<li>On 21164s, some rare FP arithmetic sequences which may trap do not have the
524appropriate nops inserted to ensure restartability.</li>
525
John Criswell3bdbd302005-11-08 21:11:33 +0000[diff] [blame]526</ul>
527</div>
528
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]529<!-- ======================================================================= -->
530<div class="doc_subsection">
531 <a name="ia64-be">Known problems with the IA64 back-end</a>
532</div>
533
534<div class="doc_text">
535
536<ul>
Chris Lattner54d12102008-06-08 23:12:47 +0000[diff] [blame]537<li>The Itanium backend is highly experimental, and has a number of known
538 issues. We are looking for a maintainer for the Itanium backend. If you
539 are interested, please contact the llvmdev mailing list.</li>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]540</ul>
541
542</div>
543
544<!-- ======================================================================= -->
545<div class="doc_subsection">
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]546 <a name="c-be">Known problems with the C back-end</a>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]547</div>
548
549<div class="doc_text">
550
551<ul>
Chris Lattnera1a4c9a2008-06-05 06:35:40 +0000[diff] [blame]552<li><a href="http://llvm.org/PR802">The C backend has only basic support for
553 inline assembly code</a>.</li>
Chris Lattner8e061162007-09-26 06:01:35 +0000[diff] [blame]554<li><a href="http://llvm.org/PR1658">The C backend violates the ABI of common
555 C++ programs</a>, preventing intermixing between C++ compiled by the CBE and
Duncan Sands56448462008-06-08 20:18:35 +0000[diff] [blame]556 C++ code compiled with llc or native compilers.</li>
Duncan Sandse09506a2008-02-10 13:40:55 +0000[diff] [blame]557<li>The C backend does not support all exception handling constructs.</li>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]558</ul>
559
560</div>
John Criswell3bdbd302005-11-08 21:11:33 +0000[diff] [blame]561
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]562
563<!-- ======================================================================= -->
564<div class="doc_subsection">
Chris Lattnera1a4c9a2008-06-05 06:35:40 +0000[diff] [blame]565 <a name="c-fe">Known problems with the llvm-gcc C front-end</a>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]566</div>
Chris Lattner178f3db2003-10-02 05:07:23 +0000[diff] [blame]567
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]568<div class="doc_text">
Chris Lattner72a269f2006-03-03 00:34:26 +0000[diff] [blame]569
Chris Lattnercdc44ed2008-02-06 18:00:06 +0000[diff] [blame]570<p>llvm-gcc does not currently support <a href="http://llvm.org/PR869">Link-Time
571Optimization</a> on most platforms "out-of-the-box". Please inquire on the
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]572llvmdev mailing list if you are interested.</p>
Chris Lattner44124232006-08-08 17:27:28 +0000[diff] [blame]573
Chris Lattnera1a4c9a2008-06-05 06:35:40 +0000[diff] [blame]574<p>The only major language feature of GCC not supported by llvm-gcc is
575 the <tt>__builtin_apply</tt> family of builtins. However, some extensions
576 are only supported on some targets. For example, trampolines are only
Duncan Sands56448462008-06-08 20:18:35 +0000[diff] [blame]577 supported on some targets (these are used when you take the address of a
578 nested function).</p>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]579
Chris Lattnera1a4c9a2008-06-05 06:35:40 +0000[diff] [blame]580<p>If you run into GCC extensions which are not supported, please let us know.
581</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]582
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]583</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]584
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]585<!-- ======================================================================= -->
586<div class="doc_subsection">
Chris Lattnera1a4c9a2008-06-05 06:35:40 +0000[diff] [blame]587 <a name="c++-fe">Known problems with the llvm-gcc C++ front-end</a>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]588</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]589
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]590<div class="doc_text">
591
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]592<p>The C++ front-end is considered to be fully
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]593tested and works for a number of non-trivial programs, including LLVM
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]594itself, Qt, Mozilla, etc.</p>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]595
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]596<ul>
Anton Korobeynikov28f08aa2008-10-11 18:27:16 +0000[diff] [blame]597<li>Exception handling works well on the X86 and PowerPC targets. Currently
598 only linux and darwin targets are supported (both 32 and 64 bit).</li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]599</ul>
Chris Lattner46ecf612003-10-07 22:14:37 +0000[diff] [blame]600
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]601</div>
602
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]603
Chris Lattnere38ac152008-02-12 06:29:45 +0000[diff] [blame]604<!-- ======================================================================= -->
605<div class="doc_subsection">
Chris Lattnera1a4c9a2008-06-05 06:35:40 +0000[diff] [blame]606 <a name="ada-fe">Known problems with the llvm-gcc Ada front-end</a>
Chris Lattnere38ac152008-02-12 06:29:45 +0000[diff] [blame]607</div>
608
609<div class="doc_text">
610The llvm-gcc 4.2 Ada compiler works fairly well, however this is not a mature
611technology and problems should be expected.
612<ul>
Duncan Sands56448462008-06-08 20:18:35 +0000[diff] [blame]613<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]614to lack of trampoline support (pointers to nested functions) on other platforms,
Duncan Sands56448462008-06-08 20:18:35 +0000[diff] [blame]615however 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]616which does support trampolines.</li>
617<li>The Ada front-end <a href="http://llvm.org/PR2007">fails to bootstrap</a>.
618Workaround: configure with --disable-bootstrap.</li>
619<li>The c380004 and <a href="http://llvm.org/PR2010">c393010</a> ACATS tests
Duncan Sands56448462008-06-08 20:18:35 +0000[diff] [blame]620fail (c380004 also fails with gcc-4.2 mainline). When built at -O3, the
621<a href="http://llvm.org/PR2421">cxg2021</a> ACATS test also fails.</li>
622<li>Some gcc specific Ada tests continue to crash the compiler. The testsuite
623reports most tests as having failed even though they pass.</li>
Chris Lattnere38ac152008-02-12 06:29:45 +0000[diff] [blame]624<li>The -E binder option (exception backtraces)
625<a href="http://llvm.org/PR1982">does not work</a> and will result in programs
626crashing if an exception is raised. Workaround: do not use -E.</li>
627<li>Only discrete types <a href="http://llvm.org/PR1981">are allowed to start
628or finish at a non-byte offset</a> in a record. Workaround: do not pack records
629or use representation clauses that result in a field of a non-discrete type
630starting or finishing in the middle of a byte.</li>
Chris Lattnerb076b002008-06-08 21:19:07 +0000[diff] [blame]631<li>The <tt>lli</tt> interpreter <a href="http://llvm.org/PR2009">considers
632'main' as generated by the Ada binder to be invalid</a>.
633Workaround: hand edit the file to use pointers for <tt>argv</tt> and
634<tt>envp</tt> rather than integers.</li>
635<li>The <tt>-fstack-check</tt> option <a href="http://llvm.org/PR2008">is
636ignored</a>.</li>
Chris Lattnere38ac152008-02-12 06:29:45 +0000[diff] [blame]637</ul>
638</div>
639
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]640<!-- *********************************************************************** -->
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]641<div class="doc_section">
642 <a name="additionalinfo">Additional Information</a>
643</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]644<!-- *********************************************************************** -->
645
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]646<div class="doc_text">
647
Chris Lattnercb5596d2005-05-16 17:13:10 +0000[diff] [blame]648<p>A wide variety of additional information is available on the <a
Chris Lattnere0c1df42007-05-18 00:44:29 +0000[diff] [blame]649href="http://llvm.org">LLVM web page</a>, in particular in the <a
650href="http://llvm.org/docs/">documentation</a> section. The web page also
Reid Spencerc7f87f22007-07-09 08:04:31 +0000[diff] [blame]651contains versions of the API documentation which is up-to-date with the
652Subversion version of the source code.
Misha Brukman96158092005-03-30 19:14:24 +0000[diff] [blame]653You can access versions of these documents specific to this release by going
654into the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]655
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]656<p>If you have any questions or comments about LLVM, please feel free to contact
Chris Lattnera69595e2005-10-29 07:07:09 +0000[diff] [blame]657us via the <a href="http://llvm.org/docs/#maillist"> mailing
Chris Lattnerb84f3322003-12-12 21:22:16 +0000[diff] [blame]658lists</a>.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]659
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]660</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]661
662<!-- *********************************************************************** -->
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]663
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]664<hr>
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]665<address>
Misha Brukman8834af92003-12-21 22:53:21 +0000[diff] [blame]666 <a href="http://jigsaw.w3.org/css-validator/check/referer"><img
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