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gerrit-public.fairphone.software / platform / external / llvm / 27aff8755b33bfa59a22126fcd7f700d0fdde8db / . / docs / ReleaseNotes.html
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Chris Lattner2b659ef2008-02-12 06:29:45 +0000[diff] [blame]8 <title>LLVM 2.3 Release Notes</title>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]9</head>
10<body>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]11
Chris Lattner2b659ef2008-02-12 06:29:45 +0000[diff] [blame]12<div class="doc_title">LLVM 2.3 Release Notes</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]13
14<ol>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]15 <li><a href="#intro">Introduction</a></li>
16 <li><a href="#whatsnew">What's New?</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
Chris Lattner77d29b12008-06-05 08:02:49 +0000[diff] [blame]27<!-- Done through Week-of-Mon-20080324.txt -->
28
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]29<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]30<div class="doc_section">
31 <a name="intro">Introduction</a>
32</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]33<!-- *********************************************************************** -->
34
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]35<div class="doc_text">
36
37<p>This document contains the release notes for the LLVM compiler
Chris Lattner2b659ef2008-02-12 06:29:45 +0000[diff] [blame]38infrastructure, release 2.3. Here we describe the status of LLVM, including
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]39major improvements from the previous release and any known problems. All LLVM
Chris Lattnercaf06342007-05-09 04:58:11 +0000[diff] [blame]40releases may be downloaded from the <a href="http://llvm.org/releases/">LLVM
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]41releases web site</a>.</p>
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]42
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame]43<p>For more information about LLVM, including information about the latest
Chris Lattnerc463b272005-10-29 07:07:09 +0000[diff] [blame]44release, please check out the <a href="http://llvm.org/">main LLVM
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]45web site</a>. If you have questions or comments, the <a
46href="http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVM developer's mailing
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]47list</a> is a good place to send them.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]48
Reid Spencer669ed452007-07-09 08:04:31 +0000[diff] [blame]49<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]50main LLVM web page, this document applies to the <i>next</i> release, not the
51current one. To see the release notes for a specific releases, please see the
52<a href="http://llvm.org/releases/">releases page</a>.</p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]53
54</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]55
56<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]57<div class="doc_section">
58 <a name="whatsnew">What's New?</a>
59</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]60<!-- *********************************************************************** -->
61
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]62<div class="doc_text">
63
Chris Lattner2b659ef2008-02-12 06:29:45 +0000[diff] [blame]64<p>This is the fourteenth public release of the LLVM Compiler Infrastructure.
Chris Lattner791f77b2008-06-05 06:25:56 +0000[diff] [blame]65It includes a large number of features and refinements from LLVM 2.2.</p>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]66
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]67</div>
68
Chris Lattner2b659ef2008-02-12 06:29:45 +0000[diff] [blame]69<!-- Unfinished features in 2.3:
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]70 Machine LICM
71 Machine Sinking
72 LegalizeDAGTypes
73 -->
74
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]75<!--=========================================================================-->
Chris Lattner8a458762005-05-15 05:44:51 +0000[diff] [blame]76<div class="doc_subsection">
Chris Lattner77d29b12008-06-05 08:02:49 +0000[diff] [blame]77<a name="changes">Major Changes in LLVM 2.3</a>
Chris Lattnerb4c68cd2008-02-10 07:04:35 +0000[diff] [blame]78</div>
79
80<div class="doc_text">
81
Chris Lattner2b659ef2008-02-12 06:29:45 +0000[diff] [blame]82<p>LLVM 2.2 was the last LLVM release to support llvm-gcc 4.0 and llvm-upgrade.
83llvm-gcc 4.0 has been replaced with llvm-gcc 4.2. llvm-upgrade was useful for
Chris Lattner791f77b2008-06-05 06:25:56 +0000[diff] [blame]84upgrading LLVM 1.9 files to LLVM 2.x syntax, but you can always use a previous
Gabor Greif96a89c72008-06-05 18:39:01 +0000[diff] [blame]85LLVM release to do this. One nice impact of this is that the LLVM regression
Chris Lattner791f77b2008-06-05 06:25:56 +0000[diff] [blame]86test suite no longer depends on llvm-upgrade, which makes it run faster.</p>
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]87
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]88<p>LLVM API Changes:</p>
Chris Lattner77d29b12008-06-05 08:02:49 +0000[diff] [blame]89
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]90<ul>
91<li>Several core LLVM IR classes have migrated to use 'FOOCLASS::Create(...)'
92 instead of 'new FOOCLASS(...)' (e.g. where FOOCLASS=BasicBlock). We hope to
93 standardize on FOOCLASS::Create for all IR classes in the future, but not
94 all of them have been moved over yet.</li>
95<li>LLVM 2.3 renames the LLVMBuilder and LLVMFoldingBuilder classes to
96 IRBuilder.</li>
97<li>MRegisterInfo was renamed to TargetRegisterInfo.</li>
98<li>The MappedFile class is gone, please use MemoryBuffer instead.</li>
Duncan Sands27aff872008-06-08 20:18:35 +0000[diff] [blame^]99<li>The '-enable-eh' flag to llc has been removed. Now code should encode
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]100 whether it is safe to not generate unwind information for a function by
101 tagging the Function object with the 'nounwind' attribute.</li>
102
103</ul>
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]104</div>
105
106<!--=========================================================================-->
107<div class="doc_subsection">
108<a name="majorfeatures">Major New Features</a>
109</div>
110
111<div class="doc_text">
112
Chris Lattner2b659ef2008-02-12 06:29:45 +0000[diff] [blame]113<p>LLVM 2.3 includes several major new capabilities:</p>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]114
115<ul>
Duncan Sands27aff872008-06-08 20:18:35 +0000[diff] [blame^]116<li>Multiple Return Value Support.</li>
Chris Lattnerbc5786b2008-06-05 06:57:39 +0000[diff] [blame]117
118
119<li><p>LLVM 2.3 includes a complete reimplementation of the "llvmc" tool. It is
Duncan Sands27aff872008-06-08 20:18:35 +0000[diff] [blame^]120designed to overcome several problems with the original llvmc and to provide a
121superset of the features of the 'gcc' driver.</p>
Chris Lattnerbc5786b2008-06-05 06:57:39 +0000[diff] [blame]122
123<p>The main features of llvmc2 is:</p>
124
125<ul>
126<li>Extended handling of command line options and smart rules for
127dispatching them to different tools.</li>
128<li>Flexible (and extensible) rules for defining different tools.</li>
129<li>The different intermediate steps performed by tools are represented
Gabor Greif96a89c72008-06-05 18:39:01 +0000[diff] [blame]130as edges in the abstract graph.</li>
Duncan Sands47eff2b2008-06-08 19:38:43 +0000[diff] [blame]131<li>The 'language' for driver behavior definition is tablegen and thus
Chris Lattnerbc5786b2008-06-05 06:57:39 +0000[diff] [blame]132it's relatively easy to add new features.</li>
133<li>The definition of driver is transformed into set of C++ classes, thus
134no runtime interpretation is needed.</li>
135</ul>
Chris Lattnerbc5786b2008-06-05 06:57:39 +0000[diff] [blame]136</li>
137
Gabor Greif96a89c72008-06-05 18:39:01 +0000[diff] [blame]138
Chris Lattner77d29b12008-06-05 08:02:49 +0000[diff] [blame]139<li>Reimplemented <a href="LinkTimeOptimization.html">LTO interface</a> in
140 C.</li>
Chris Lattnerbc5786b2008-06-05 06:57:39 +0000[diff] [blame]141
142
Duncan Sands27aff872008-06-08 20:18:35 +0000[diff] [blame^]143<li>Kaleidoscope tutorial in Ocaml.</li>
Chris Lattnerbc5786b2008-06-05 06:57:39 +0000[diff] [blame]144
Chris Lattner8170c102008-02-10 08:18:42 +0000[diff] [blame]145</ul>
146
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]147</div>
148
Chris Lattner791f77b2008-06-05 06:25:56 +0000[diff] [blame]149
150<!--=========================================================================-->
151<div class="doc_subsection">
152<a name="frontends">llvm-gcc 4.2 Improvements and Clang</a>
153</div>
154
155<div class="doc_text">
156
Duncan Sands27aff872008-06-08 20:18:35 +0000[diff] [blame^]157<p>LLVM 2.3 fully supports the llvm-gcc 4.2 front-end.</p>
Chris Lattner791f77b2008-06-05 06:25:56 +0000[diff] [blame]158
159<p>llvm-gcc 4.2 includes numerous fixes to better support the Objective-C
160front-end. Objective-C now works very well on Mac OS/X.</p>
161
162<p>llvm-gcc 4.2 includes many other fixes which improve conformance with the
163relevant parts of the GCC testsuite.</p>
164
165<p>The <a href="http://clang.llvm.org/">clang project</a> is an effort to build
166a set of new 'llvm native' front-end technologies for the LLVM optimizer
167and code generator. Currently, its C and Objective-C support is maturing
168nicely, and it has advanced source-to-source analysis and transformation
169capabilities. If you are interested in building source-level tools for C and
170Objective-C (and eventually C++), you should take a look. However, note that
171clang is not an official part of the LLVM 2.3 release. If you are interested in
172this project, please see its <a href="http://clang.llvm.org/">web site</a>.</p>
173
174</div>
175
176
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]177<!--=========================================================================-->
178<div class="doc_subsection">
Chris Lattnerf304ffc2008-02-10 08:17:19 +0000[diff] [blame]179<a name="coreimprovements">LLVM Core Improvements</a>
180</div>
181
182<div class="doc_text">
183<p>New features include:
184</p>
185
Chris Lattnerf304ffc2008-02-10 08:17:19 +0000[diff] [blame]186
Chris Lattner791f77b2008-06-05 06:25:56 +0000[diff] [blame]187Common linkage?
188
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]189Atomic operation support, Alpha, X86, X86-64, PowerPC. "__sync_synchronize",
Anton Korobeynikov0d176912008-06-08 10:23:46 +0000[diff] [blame]190"__sync_val_compare_and_swap", etc
Chris Lattner791f77b2008-06-05 06:25:56 +0000[diff] [blame]191
192<ul>
Gordon Henriksen1494bcc2008-06-05 12:51:50 +0000[diff] [blame]193<li>The C and Ocaml bindings have received additional improvements. The
194bindings now cover pass managers, several transformation passes, iteration
195over the LLVM IR, target data, and parameter attribute lists.</li>
Chris Lattnerf304ffc2008-02-10 08:17:19 +0000[diff] [blame]196</ul>
197
198</div>
199
200<!--=========================================================================-->
201<div class="doc_subsection">
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]202<a name="optimizer">Optimizer Improvements</a>
203</div>
204
205<div class="doc_text">
206
Chris Lattnerf304ffc2008-02-10 08:17:19 +0000[diff] [blame]207<p>In addition to a huge array of bug fixes and minor performance tweaks, the
Chris Lattner2b659ef2008-02-12 06:29:45 +0000[diff] [blame]208LLVM 2.3 optimizers support a few major enhancements:</p>
Chris Lattneracce85d2008-02-10 07:46:44 +0000[diff] [blame]209
210<ul>
211
Devang Patel83a15d72008-06-05 21:44:00 +0000[diff] [blame]212<li>Loop index set splitting on by default.<p>
213This transformation hoists conditions from loop bodies and reduces loop's
214iteration space to improve performance. For example, <p>
215<pre>
216for (i = LB; i < UB; ++i)
217 if (i <= NV)
218 LOOP_BODY
219</pre>
220is transformed into
221<pre>
222NUB = min(NV+1, UB)
223for (i = LB; i < NUB; ++i)
224 LOOP_BODY
225</pre>
226</li>
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]227
Duncan Sands27aff872008-06-08 20:18:35 +0000[diff] [blame^]228<li>LLVM includes a new <tt>memcpy</tt> optimization pass removes
229dead <tt>memcpy</tt> calls, unneeded copies of aggregates, and performs
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]230return slot optimization. The LLVM optimizer now notices long sequences of
Duncan Sands27aff872008-06-08 20:18:35 +0000[diff] [blame^]231consecutive stores and merges them into <tt>memcpy</tt>'s where profitable.</li>
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]232
Gabor Greif96a89c72008-06-05 18:39:01 +0000[diff] [blame]233<li>Alignment detection for vector memory references and for <tt>memcpy</tt> and
234<tt>memset</tt> is now more aggressive.</li>
Owen Anderson30073ff2008-06-06 16:23:15 +0000[diff] [blame]235
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]236<li>The aggressive dead code elimination (ADCE) optimization has been rewritten
237to make it both faster and safer in the presence of code containing infinite
238loops. Some of its prior functionality has been factored out into the loop
239deletion pass, which <em>is</em> safe for infinite loops.</li>
240
241<li>Several optimizations have been sped up, leading to faster code generation
242 with the same code quality.</li>
243
244<li>The 'SimplifyLibCalls' pass, which optimizes calls to libc and libm
245 functions for C-based languages, has been rewritten to be a FunctionPass
246 instead a ModulePass. This allows it to be run more often and to be
247 included at -O1 in llvm-gcc. It was also extended to include more
Duncan Sands27aff872008-06-08 20:18:35 +0000[diff] [blame^]248 optimizations and several corner case bugs were fixed.</li>
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]249
Duncan Sands47eff2b2008-06-08 19:38:43 +0000[diff] [blame]250<li>LLVM now includes a simple 'Jump Threading' pass, which attempts to simplify
Duncan Sands27aff872008-06-08 20:18:35 +0000[diff] [blame^]251 conditional branches using information about predecessor blocks, simplifying
252 the control flow graph. This pass is pretty basic at this point, but catches
253 some important cases and provides a foundation to build on.</li>
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]254</ul>
255
256</div>
257
258<!--=========================================================================-->
259<div class="doc_subsection">
260<a name="codegen">Code Generator Improvements</a>
261</div>
262
263<div class="doc_text">
264
265<p>We put a significant amount of work into the code generator infrastructure,
266which allows us to implement more aggressive algorithms and make it run
267faster:</p>
268
269<ul>
270<li>MemOperand in the code generator: describe me!.</li>
271
272<li>The target-independent code generator infrastructure now uses LLVM's APInt
273 class to handle integer values, which allows it to support integer types
274 larger than 64 bits. Note that support for such types is also dependent on
275 target-specific support. Use of APInt is also a step toward support for
276 non-power-of-2 integer sizes.</li>
277
278<li>Several compile time speedups for code with large basic blocks.</li>
279
280<li>Several improvements which make llc's <tt>--view-sunit-dags</tt>
281 visualization of scheduling dependency graphs easier to understand.</li>
282
283<li>The code generator allows targets to write patterns that generate subreg
284 references directly in .td files now.</li>
285
286<li><tt>memcpy</tt> lowering in the backend is more aggressive, particularly for
287 <tt>memcpy</tt> calls introduced by the code generator when handling
288 pass-by-value structure argument copies.</li>
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]289</ul>
290
291</div>
292
293
294<!--=========================================================================-->
295<div class="doc_subsection">
Chris Lattner77d29b12008-06-05 08:02:49 +0000[diff] [blame]296<a name="x86specific">X86/X86-64 Specific Improvements</a>
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]297</div>
Chris Lattner60893e52007-05-18 06:33:02 +0000[diff] [blame]298
Chris Lattner738bd302006-04-18 06:32:08 +0000[diff] [blame]299<div class="doc_text">
Chris Lattnerf304ffc2008-02-10 08:17:19 +0000[diff] [blame]300<p>New target-specific features include:
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]301</p>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]302
303<ul>
Chris Lattner791f77b2008-06-05 06:25:56 +0000[diff] [blame]304<li>llvm-gcc's X86-64 ABI conformance is far improved, particularly in the
Gabor Greif96a89c72008-06-05 18:39:01 +0000[diff] [blame]305 area of passing and returning structures by value. llvm-gcc compiled code
Chris Lattner791f77b2008-06-05 06:25:56 +0000[diff] [blame]306 now interoperates very well on X86-64 systems with other compilers.</li>
307
Duncan Sands47eff2b2008-06-08 19:38:43 +0000[diff] [blame]308<li>Support for Win64 was added. This includes code generation itself, JIT
Anton Korobeynikova6094be2008-06-08 10:24:13 +0000[diff] [blame]309 support and necessary changes to llvm-gcc.</li>
310
Chris Lattner791f77b2008-06-05 06:25:56 +0000[diff] [blame]311<li>The LLVM X86 backend now supports the support SSE 4.1 instruction set, and
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]312 the llvm-gcc 4.2 front-end supports the SSE 4.1 compiler builtins. Various
313 generic vector operations (insert/extract/shuffle) are much more efficient
314 when SSE 4.1 is enabled. The JIT automatically takes advantage of these
315 instructions, but llvm-gcc must be explicitly told to use them, e.g. with
316 <tt>-march=penryn</tt>.</li>
Anton Korobeynikova6094be2008-06-08 10:24:13 +0000[diff] [blame]317
Chris Lattner791f77b2008-06-05 06:25:56 +0000[diff] [blame]318<li>The X86 backend now does a number of optimizations that aim to avoid
319 converting numbers back and forth from SSE registers to the X87 floating
320 point stack.</li>
Anton Korobeynikova6094be2008-06-08 10:24:13 +0000[diff] [blame]321
Chris Lattnerbc5786b2008-06-05 06:57:39 +0000[diff] [blame]322<li>The X86 backend supports stack realignment, which is particularly useful for
323 vector code on OS's without 16-byte aligned stacks.</li>
Chris Lattner791f77b2008-06-05 06:25:56 +0000[diff] [blame]324
325<li>The X86 backend now supports the "sseregparm" options in GCC, which allow
326 functions to be tagged as passing floating point values in SSE
327 registers.</li>
328
329<li>Trampolines (taking the address of a nested function) now work on
Duncan Sands27aff872008-06-08 20:18:35 +0000[diff] [blame^]330 Linux/X86-64.</li>
Anton Korobeynikova6094be2008-06-08 10:24:13 +0000[diff] [blame]331
Chris Lattner77d29b12008-06-05 08:02:49 +0000[diff] [blame]332<li><tt>__builtin_prefetch</tt> is now compiled into the appropriate prefetch
333 instructions instead of being ignored.</li>
Chris Lattner791f77b2008-06-05 06:25:56 +0000[diff] [blame]334
Duncan Sands27aff872008-06-08 20:18:35 +0000[diff] [blame^]335<li>128-bit integers are now supported on X86-64 targets.</li>
Dan Gohman4e16d402008-06-05 16:15:39 +0000[diff] [blame]336
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]337<li>The register allocator can now rematerialize PIC-base computations.</li>
338
Chris Lattnerbfb17ab2007-05-17 21:41:31 +0000[diff] [blame]339</ul>
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]340
Chris Lattnerbfb17ab2007-05-17 21:41:31 +0000[diff] [blame]341</div>
Chris Lattnerc5d658a2006-03-03 00:34:26 +0000[diff] [blame]342
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]343<!--=========================================================================-->
344<div class="doc_subsection">
Chris Lattner77d29b12008-06-05 08:02:49 +0000[diff] [blame]345<a name="targetspecific">Other Target Specific Improvements</a>
346</div>
347
348<div class="doc_text">
349<p>New target-specific features include:
350</p>
351
352<ul>
Gabor Greif96a89c72008-06-05 18:39:01 +0000[diff] [blame]353<li>The LLVM C backend now supports vector code.</li>
Chris Lattner77d29b12008-06-05 08:02:49 +0000[diff] [blame]354
355
356</ul>
357
358</div>
359
360
361
362<!--=========================================================================-->
363<div class="doc_subsection">
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]364<a name="otherimprovements">Other Improvements</a>
365</div>
366
367<div class="doc_text">
368<p>New features include:
369</p>
370
371<ul>
Chris Lattnerbc5786b2008-06-05 06:57:39 +0000[diff] [blame]372<li>LLVM now builds with GCC 4.3.</li>
Chris Lattner0b832202008-06-08 02:45:07 +0000[diff] [blame]373<li><tt>llvm2cpp</tt> tool has been folded into llc, use
374 <tt>llc -march=cpp</tt></li>
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]375</ul>
376
377</div>
Chris Lattnerc5d658a2006-03-03 00:34:26 +0000[diff] [blame]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>
Gabor Greif96a89c72008-06-05 18:39:01 +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>
459 <li>The X86 backend generates inefficient floating point code when configured to
Chris Lattnerf304ffc2008-02-10 08:17:19 +0000[diff] [blame]460 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>
465 <a href="http://llvm.org/PR2257">bugs</a> in FP stackifier
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]466</ul>
467
468</div>
469
470<!-- ======================================================================= -->
471<div class="doc_subsection">
472 <a name="ppc-be">Known problems with the PowerPC back-end</a>
473</div>
474
475<div class="doc_text">
476
477<ul>
Nicolas Geoffraye4285dc2007-05-15 09:21:28 +0000[diff] [blame]478<li>The Linux PPC32/ABI support needs testing for the interpreter and static
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]479compilation, and lacks support for debug information.</li>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]480</ul>
481
482</div>
483
484<!-- ======================================================================= -->
485<div class="doc_subsection">
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]486 <a name="arm-be">Known problems with the ARM back-end</a>
487</div>
488
489<div class="doc_text">
490
491<ul>
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]492<li>Thumb mode works only on ARMv6 or higher processors. On sub-ARMv6
Duncan Sandsc90d68b2007-09-26 15:59:54 +0000[diff] [blame]493processors, thumb programs can crash or produce wrong
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]494results (<a href="http://llvm.org/PR1388">PR1388</a>).</li>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]495<li>Compilation for ARM Linux OABI (old ABI) is supported, but not fully tested.
496</li>
Chris Lattnerf304ffc2008-02-10 08:17:19 +0000[diff] [blame]497<li>There is a bug in QEMU-ARM (&lt;= 0.9.0) which causes it to incorrectly execute
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]498programs compiled with LLVM. Please use more recent versions of QEMU.</li>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]499</ul>
500
501</div>
502
503<!-- ======================================================================= -->
504<div class="doc_subsection">
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]505 <a name="sparc-be">Known problems with the SPARC back-end</a>
506</div>
507
508<div class="doc_text">
509
510<ul>
511<li>The SPARC backend only supports the 32-bit SPARC ABI (-m32), it does not
512 support the 64-bit SPARC ABI (-m64).</li>
513</ul>
514
515</div>
516
517<!-- ======================================================================= -->
518<div class="doc_subsection">
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]519 <a name="alpha-be">Known problems with the Alpha back-end</a>
520</div>
521
522<div class="doc_text">
523
524<ul>
525
526<li>On 21164s, some rare FP arithmetic sequences which may trap do not have the
527appropriate nops inserted to ensure restartability.</li>
528
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]529</ul>
530</div>
531
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]532<!-- ======================================================================= -->
533<div class="doc_subsection">
534 <a name="ia64-be">Known problems with the IA64 back-end</a>
535</div>
536
537<div class="doc_text">
538
539<ul>
540
541<li>C++ programs are likely to fail on IA64, as calls to <tt>setjmp</tt> are
542made where the argument is not 16-byte aligned, as required on IA64. (Strictly
543speaking this is not a bug in the IA64 back-end; it will also be encountered
544when building C++ programs using the C back-end.)</li>
545
546<li>The C++ front-end does not use <a href="http://llvm.org/PR406">IA64
547ABI compliant layout of v-tables</a>. In particular, it just stores function
548pointers instead of function descriptors in the vtable. This bug prevents
549mixing C++ code compiled with LLVM with C++ objects compiled by other C++
550compilers.</li>
551
552<li>There are a few ABI violations which will lead to problems when mixing LLVM
553output with code built with other compilers, particularly for floating-point
554programs.</li>
555
Duncan Sands47eff2b2008-06-08 19:38:43 +0000[diff] [blame]556<li>Defining vararg functions is not supported (but calling them is OK).</li>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]557
Chris Lattnercaf06342007-05-09 04:58:11 +0000[diff] [blame]558<li>The Itanium backend has bitrotted somewhat.</li>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]559</ul>
560
561</div>
562
563<!-- ======================================================================= -->
564<div class="doc_subsection">
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]565 <a name="c-be">Known problems with the C back-end</a>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]566</div>
567
568<div class="doc_text">
569
570<ul>
Chris Lattner5733b272008-06-05 06:35:40 +0000[diff] [blame]571<li><a href="http://llvm.org/PR802">The C backend has only basic support for
572 inline assembly code</a>.</li>
Chris Lattner725a0d82007-09-26 06:01:35 +0000[diff] [blame]573<li><a href="http://llvm.org/PR1658">The C backend violates the ABI of common
574 C++ programs</a>, preventing intermixing between C++ compiled by the CBE and
Duncan Sands27aff872008-06-08 20:18:35 +0000[diff] [blame^]575 C++ code compiled with llc or native compilers.</li>
Duncan Sandsf74c0cc2008-02-10 13:40:55 +0000[diff] [blame]576<li>The C backend does not support all exception handling constructs.</li>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]577</ul>
578
579</div>
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]580
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]581
582<!-- ======================================================================= -->
583<div class="doc_subsection">
Chris Lattner5733b272008-06-05 06:35:40 +0000[diff] [blame]584 <a name="c-fe">Known problems with the llvm-gcc C front-end</a>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]585</div>
Chris Lattner47588f92003-10-02 05:07:23 +0000[diff] [blame]586
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]587<!-- _______________________________________________________________________ -->
Chris Lattnerb40efb32003-12-14 05:03:43 +0000[diff] [blame]588<div class="doc_subsubsection">Bugs</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]589
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]590<div class="doc_text">
Chris Lattnerc5d658a2006-03-03 00:34:26 +0000[diff] [blame]591
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame]592<p>llvm-gcc does not currently support <a href="http://llvm.org/PR869">Link-Time
593Optimization</a> on most platforms "out-of-the-box". Please inquire on the
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]594llvmdev mailing list if you are interested.</p>
Chris Lattnerd9ea0172006-08-08 17:27:28 +0000[diff] [blame]595
Chris Lattner5733b272008-06-05 06:35:40 +0000[diff] [blame]596<p>The only major language feature of GCC not supported by llvm-gcc is
597 the <tt>__builtin_apply</tt> family of builtins. However, some extensions
598 are only supported on some targets. For example, trampolines are only
Duncan Sands27aff872008-06-08 20:18:35 +0000[diff] [blame^]599 supported on some targets (these are used when you take the address of a
600 nested function).</p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]601
Chris Lattner5733b272008-06-05 06:35:40 +0000[diff] [blame]602<p>If you run into GCC extensions which are not supported, please let us know.
603</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]604
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]605</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]606
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]607<!-- ======================================================================= -->
608<div class="doc_subsection">
Chris Lattner5733b272008-06-05 06:35:40 +0000[diff] [blame]609 <a name="c++-fe">Known problems with the llvm-gcc C++ front-end</a>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]610</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]611
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]612<div class="doc_text">
613
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]614<p>The C++ front-end is considered to be fully
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame]615tested and works for a number of non-trivial programs, including LLVM
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]616itself, Qt, Mozilla, etc.</p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]617
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]618<ul>
Chris Lattner5733b272008-06-05 06:35:40 +0000[diff] [blame]619<li>Exception handling works well on the X86 and PowerPC targets, including
Duncan Sands27aff872008-06-08 20:18:35 +0000[diff] [blame^]620X86-64 darwin. This works when linking to a libstdc++ compiled by GCC. It is
621supported on X86-64 linux, but that is disabled by default in this release.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]622</ul>
Chris Lattnerfcc54b32003-10-07 22:14:37 +0000[diff] [blame]623
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]624</div>
625
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]626
Chris Lattner2b659ef2008-02-12 06:29:45 +0000[diff] [blame]627<!-- ======================================================================= -->
628<div class="doc_subsection">
Chris Lattner5733b272008-06-05 06:35:40 +0000[diff] [blame]629 <a name="ada-fe">Known problems with the llvm-gcc Ada front-end</a>
Chris Lattner2b659ef2008-02-12 06:29:45 +0000[diff] [blame]630</div>
631
632<div class="doc_text">
633The llvm-gcc 4.2 Ada compiler works fairly well, however this is not a mature
634technology and problems should be expected.
635<ul>
Duncan Sands27aff872008-06-08 20:18:35 +0000[diff] [blame^]636<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]637to lack of trampoline support (pointers to nested functions) on other platforms,
Duncan Sands27aff872008-06-08 20:18:35 +0000[diff] [blame^]638however 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]639which does support trampolines.</li>
640<li>The Ada front-end <a href="http://llvm.org/PR2007">fails to bootstrap</a>.
641Workaround: configure with --disable-bootstrap.</li>
642<li>The c380004 and <a href="http://llvm.org/PR2010">c393010</a> ACATS tests
Duncan Sands27aff872008-06-08 20:18:35 +0000[diff] [blame^]643fail (c380004 also fails with gcc-4.2 mainline). When built at -O3, the
644<a href="http://llvm.org/PR2421">cxg2021</a> ACATS test also fails.</li>
645<li>Some gcc specific Ada tests continue to crash the compiler. The testsuite
646reports most tests as having failed even though they pass.</li>
Chris Lattner2b659ef2008-02-12 06:29:45 +0000[diff] [blame]647<li>The -E binder option (exception backtraces)
648<a href="http://llvm.org/PR1982">does not work</a> and will result in programs
649crashing if an exception is raised. Workaround: do not use -E.</li>
650<li>Only discrete types <a href="http://llvm.org/PR1981">are allowed to start
651or finish at a non-byte offset</a> in a record. Workaround: do not pack records
652or use representation clauses that result in a field of a non-discrete type
653starting or finishing in the middle of a byte.</li>
Gabor Greif96a89c72008-06-05 18:39:01 +0000[diff] [blame]654<li>The <tt>lli</tt> interpreter <a href="http://llvm.org/PR2009">considers 'main'
Chris Lattner2b659ef2008-02-12 06:29:45 +0000[diff] [blame]655as generated by the Ada binder to be invalid</a>.
Gabor Greif96a89c72008-06-05 18:39:01 +0000[diff] [blame]656Workaround: hand edit the file to use pointers for <tt>argv</tt> and <tt>envp</tt> rather than
Chris Lattner2b659ef2008-02-12 06:29:45 +0000[diff] [blame]657integers.</li>
Gabor Greif96a89c72008-06-05 18:39:01 +0000[diff] [blame]658<li>The <tt>-fstack-check</tt> option <a href="http://llvm.org/PR2008">is ignored</a>.</li>
Chris Lattner2b659ef2008-02-12 06:29:45 +0000[diff] [blame]659</ul>
660</div>
661
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]662<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]663<div class="doc_section">
664 <a name="additionalinfo">Additional Information</a>
665</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]666<!-- *********************************************************************** -->
667
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]668<div class="doc_text">
669
Chris Lattner416db102005-05-16 17:13:10 +0000[diff] [blame]670<p>A wide variety of additional information is available on the <a
Chris Lattnerb4b0ce72007-05-18 00:44:29 +0000[diff] [blame]671href="http://llvm.org">LLVM web page</a>, in particular in the <a
672href="http://llvm.org/docs/">documentation</a> section. The web page also
Reid Spencer669ed452007-07-09 08:04:31 +0000[diff] [blame]673contains versions of the API documentation which is up-to-date with the
674Subversion version of the source code.
Misha Brukman109d9e82005-03-30 19:14:24 +0000[diff] [blame]675You can access versions of these documents specific to this release by going
676into the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]677
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]678<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]679us via the <a href="http://llvm.org/docs/#maillist"> mailing
Chris Lattner5eccca42003-12-12 21:22:16 +0000[diff] [blame]680lists</a>.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]681
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]682</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]683
684<!-- *********************************************************************** -->
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]685
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