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7 <title>LLVM 1.6 Release Notes</title>
11 <div class="doc_title">LLVM 1.6 Release Notes</div>
14 <li><a href="#intro">Introduction</a></li>
15 <li><a href="#whatsnew">What's New?</a></li>
16 <li><a href="GettingStarted.html">Installation Instructions</a></li>
17 <li><a href="#portability">Portability and Supported Platforms</a></li>
18 <li><a href="#knownproblems">Known Problems</a>
19 <li><a href="#additionalinfo">Additional Information</a></li>
22 <div class="doc_author">
23 <p>Written by the <a href="http://llvm.cs.uiuc.edu">LLVM Team</a><p>
26 <!-- *********************************************************************** -->
27 <div class="doc_section">
28 <a name="intro">Introduction</a>
30 <!-- *********************************************************************** -->
32 <div class="doc_text">
34 <p>This document contains the release notes for the LLVM compiler
35 infrastructure, release 1.6. Here we describe the status of LLVM, including any
36 known problems and major improvements from the previous release. The most
37 up-to-date version of this document can be found on the <a
38 href="http://llvm.cs.uiuc.edu/releases/1.6/">LLVM 1.6 web site</a>. If you are
39 not reading this on the LLVM web pages, you should probably go there because
40 this document may be updated after the release.</p>
42 <p>For more information about LLVM, including information about the latest
43 release, please check out the <a href="http://llvm.cs.uiuc.edu">main LLVM
44 web site</a>. If you have questions or comments, the <a
45 href="http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVM developer's mailing
46 list</a> is a good place to send them.</p>
48 <p>Note that if you are reading this file from CVS or the main LLVM web page,
49 this document applies to the <i>next</i> release, not the current one. To see
50 the release notes for the current or previous releases, see the <a
51 href="http://llvm.cs.uiuc.edu/releases/">releases page</a>.</p>
55 <!-- *********************************************************************** -->
56 <div class="doc_section">
57 <a name="whatsnew">What's New?</a>
59 <!-- *********************************************************************** -->
61 <div class="doc_text">
63 <p>This is the seventh public release of the LLVM Compiler Infrastructure.</p>
65 <p>LLVM 1.6 is known to correctly compile a wide range of C and C++ programs,
66 includes bug fixes for those problems found since the 1.5 release, and includes
67 a large number of new features and enhancements, described below.</p>
71 <!--=========================================================================-->
72 <div class="doc_subsection">
73 <a name="newfeatures">New Features in LLVM 1.6</a>
76 <div class="doc_text">
78 See <a href="/releases/1.5/docs/ReleaseNotes.html">LLVM 1.5 Release Notes</a>
82 <!--=========================================================================-->
83 <div class="doc_subsection">
84 <a name="codequality">Code Quality Improvements in LLVM 1.6</a>
87 <!--=========================================================================-->
88 <div class="doc_subsection">
89 <a name="codequality">Code Generator Improvements in LLVM 1.6</a>
92 <!--=========================================================================-->
93 <div class="doc_subsection">
94 <a name="bugfix">Significant Bugs Fixed in LLVM 1.6</a>
97 <!-- *********************************************************************** -->
98 <div class="doc_section">
99 <a name="portability">Portability and Supported Platforms</a>
101 <!-- *********************************************************************** -->
103 <div class="doc_text">
105 <p>LLVM is known to work on the following platforms:</p>
108 <li>Intel and AMD machines running Red Hat Linux, Fedora Core and FreeBSD
109 (and probably other unix-like systems).</li>
110 <li>Sun UltraSPARC workstations running Solaris 8.</li>
111 <li>Intel and AMD machines running on Win32 with the Cygwin libraries (limited
112 support is available for native builds with Visual C++).</li>
113 <li>PowerPC-based Mac OS X systems, running 10.2 and above.</li>
114 <li>Alpha-based machines running Debian GNU/Linux.</li>
115 <li>Itanium-based machines running Linux and HP-UX.</li>
118 <p>The core LLVM infrastructure uses
119 <a href="http://www.gnu.org/software/autoconf/">GNU autoconf</a> to adapt itself
120 to the machine and operating system on which it is built. However, minor
121 porting may be required to get LLVM to work on new platforms. We welcome your
122 portability patches and reports of successful builds or error messages.</p>
126 <!-- *********************************************************************** -->
127 <div class="doc_section">
128 <a name="knownproblems">Known Problems</a>
130 <!-- *********************************************************************** -->
132 <div class="doc_text">
134 <p>This section contains all known problems with the LLVM system, listed by
135 component. As new problems are discovered, they will be added to these
136 sections. If you run into a problem, please check the <a
137 href="http://llvm.cs.uiuc.edu/bugs/">LLVM bug database</a> and submit a bug if
138 there isn't already one.</p>
142 <!-- ======================================================================= -->
143 <div class="doc_subsection">
144 <a name="experimental">Experimental features included with this release</a>
147 <div class="doc_text">
149 <p>The following components of this LLVM release are either untested, known to
150 be broken or unreliable, or are in early development. These components should
151 not be relied on, and bugs should not be filed against them, but they may be
152 useful to some people. In particular, if you would like to work on one of these
153 components, please contact us on the llvmdev list.</p>
156 <li>The following passes are incomplete or buggy, and may be removed in future
157 releases: <tt>-cee, -branch-combine, -instloops, -paths, -pre</tt></li>
158 <li>The <tt>llvm-db</tt> tool is in a very early stage of development, but can
159 be used to step through programs and inspect the stack.</li>
160 <li>The "iterative scan" register allocator (enabled with
161 <tt>-regalloc=iterativescan</tt>) is not stable.</li>
162 <li>The SparcV8, Alpha, and IA64 code generators are experimental.</li>
167 <!-- ======================================================================= -->
168 <div class="doc_subsection">
169 <a name="core">Known problems with the LLVM Core</a>
172 <div class="doc_text">
175 <li>In the JIT, <tt>dlsym()</tt> on a symbol compiled by the JIT will not
177 <li>The JIT does not use mutexes to protect its internal data structures. As
178 such, execution of a threaded program could cause these data structures to be
181 <li><a href="http://llvm.cs.uiuc.edu/PR240">The lower-invoke pass does not
182 mark values live across a setjmp as volatile</a>. This missing feature
183 only affects targets whose setjmp/longjmp libraries do not save and restore
184 the entire register file.</li>
188 <!-- ======================================================================= -->
189 <div class="doc_subsection">
190 <a name="c-fe">Known problems with the C front-end</a>
193 <!-- _______________________________________________________________________ -->
194 <div class="doc_subsubsection">Bugs</div>
196 <div class="doc_text">
198 <li>C99 Variable sized arrays do not release stack memory when they go out of
199 scope. Thus, the following program may run out of stack space:
201 for (i = 0; i != 1000000; ++i) {
207 <li>Initialization of global union variables can only be done <a
208 href="http://llvm.cs.uiuc.edu/PR162">with the largest union member</a>.</li>
213 <!-- _______________________________________________________________________ -->
214 <div class="doc_subsubsection">
218 <div class="doc_text">
222 <li>Inline assembly is not yet supported.</li>
224 <li>"long double" is transformed by the front-end into "double". There is no
225 support for floating point data types of any size other than 32 and 64
228 <li>The following Unix system functionality has not been tested and may not
231 <li><tt>sigsetjmp</tt>, <tt>siglongjmp</tt> - These are not turned into the
232 appropriate <tt>invoke</tt>/<tt>unwind</tt> instructions. Note that
233 <tt>setjmp</tt> and <tt>longjmp</tt> <em>are</em> compiled correctly.
234 <li><tt>getcontext</tt>, <tt>setcontext</tt>, <tt>makecontext</tt>
235 - These functions have not been tested.
238 <li>Although many GCC extensions are supported, some are not. In particular,
239 the following extensions are known to <b>not be</b> supported:
241 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Local-Labels.html#Local%20Labels">Local Labels</a>: Labels local to a block.</li>
242 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Nested-Functions.html#Nested%20Functions">Nested Functions</a>: As in Algol and Pascal, lexical scoping of functions.</li>
243 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Constructing-Calls.html#Constructing%20Calls">Constructing Calls</a>: Dispatching a call to another function.</li>
244 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Extended-Asm.html#Extended%20Asm">Extended Asm</a>: Assembler instructions with C expressions as operands.</li>
245 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Constraints.html#Constraints">Constraints</a>: Constraints for asm operands.</li>
246 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Asm-Labels.html#Asm%20Labels">Asm Labels</a>: Specifying the assembler name to use for a C symbol.</li>
247 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Explicit-Reg-Vars.html#Explicit%20Reg%20Vars">Explicit Reg Vars</a>: Defining variables residing in specified registers.</li>
248 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Vector-Extensions.html#Vector%20Extensions">Vector Extensions</a>: Using vector instructions through built-in functions.</li>
249 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Target-Builtins.html#Target%20Builtins">Target Builtins</a>: Built-in functions specific to particular targets.</li>
250 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Thread_002dLocal.html">Thread-Local</a>: Per-thread variables.</li>
251 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Pragmas.html#Pragmas">Pragmas</a>: Pragmas accepted by GCC.</li>
254 <p>The following GCC extensions are <b>partially</b> supported. An ignored
255 attribute means that the LLVM compiler ignores the presence of the attribute,
256 but the code should still work. An unsupported attribute is one which is
257 ignored by the LLVM compiler and will cause a different interpretation of
261 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Length.html#Variable%20Length">Variable Length</a>:
262 Arrays whose length is computed at run time.<br>
263 Supported, but allocated stack space is not freed until the function returns (noted above).</li>
265 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html#Function%20Attributes">Function Attributes</a>:
267 Declaring that functions have no side effects or that they can never
270 <b>Supported:</b> <tt>format</tt>, <tt>format_arg</tt>, <tt>non_null</tt>,
271 <tt>noreturn</tt>, <tt>constructor</tt>, <tt>destructor</tt>,
273 <tt>deprecated</tt>, <tt>warn_unused_result</tt>, <tt>weak</tt><br>
275 <b>Ignored:</b> <tt>noinline</tt>,
276 <tt>always_inline</tt>, <tt>pure</tt>, <tt>const</tt>, <tt>nothrow</tt>,
277 <tt>malloc</tt>, <tt>no_instrument_function</tt>, <tt>cdecl</tt><br>
279 <b>Unsupported:</b> <tt>used</tt>, <tt>section</tt>, <tt>alias</tt>,
280 <tt>visibility</tt>, <tt>regparm</tt>, <tt>stdcall</tt>,
281 <tt>fastcall</tt>, all other target specific attributes</li>
283 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Attributes.html#Variable%20Attributes">Variable Attributes</a>:
284 Specifying attributes of variables.<br>
285 <b>Supported:</b> <tt>cleanup</tt>, <tt>common</tt>, <tt>nocommon</tt>,
286 <tt>deprecated</tt>, <tt>transparent_union</tt>,
287 <tt>unused</tt>, <tt>weak</tt><br>
289 <b>Unsupported:</b> <tt>aligned</tt>, <tt>mode</tt>, <tt>packed</tt>,
290 <tt>section</tt>, <tt>shared</tt>, <tt>tls_model</tt>,
291 <tt>vector_size</tt>, <tt>dllimport</tt>,
292 <tt>dllexport</tt>, all target specific attributes.</li>
294 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Type-Attributes.html#Type%20Attributes">Type Attributes</a>: Specifying attributes of types.<br>
295 <b>Supported:</b> <tt>transparent_union</tt>, <tt>unused</tt>,
296 <tt>deprecated</tt>, <tt>may_alias</tt><br>
298 <b>Unsupported:</b> <tt>aligned</tt>, <tt>packed</tt>,
299 all target specific attributes.</li>
301 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html#Other%20Builtins">Other Builtins</a>:
302 Other built-in functions.<br>
303 We support all builtins which have a C language equivalent (e.g.,
304 <tt>__builtin_cos</tt>), <tt>__builtin_alloca</tt>,
305 <tt>__builtin_types_compatible_p</tt>, <tt>__builtin_choose_expr</tt>,
306 <tt>__builtin_constant_p</tt>, and <tt>__builtin_expect</tt>
307 (currently ignored). We also support builtins for ISO C99 floating
308 point comparison macros (e.g., <tt>__builtin_islessequal</tt>),
309 <tt>__builtin_prefetch</tt>, <tt>__builtin_popcount[ll]</tt>,
310 <tt>__builtin_clz[ll]</tt>, and <tt>__builtin_ctz[ll]</tt>.</li>
313 <p>The following extensions <b>are</b> known to be supported:</p>
316 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Labels-as-Values.html#Labels%20as%20Values">Labels as Values</a>: Getting pointers to labels and computed gotos.</li>
317 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html#Statement%20Exprs">Statement Exprs</a>: Putting statements and declarations inside expressions.</li>
318 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Typeof.html#Typeof">Typeof</a>: <code>typeof</code>: referring to the type of an expression.</li>
319 <li><a href="http://gcc.gnu.org/onlinedocs/gcc-3.4.0/gcc/Lvalues.html#Lvalues">Lvalues</a>: Using <code>?:</code>, "<code>,</code>" and casts in lvalues.</li>
320 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Conditionals.html#Conditionals">Conditionals</a>: Omitting the middle operand of a <code>?:</code> expression.</li>
321 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Long-Long.html#Long%20Long">Long Long</a>: Double-word integers.</li>
322 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Complex.html#Complex">Complex</a>: Data types for complex numbers.</li>
323 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Hex-Floats.html#Hex%20Floats">Hex Floats</a>:Hexadecimal floating-point constants.</li>
324 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html#Zero%20Length">Zero Length</a>: Zero-length arrays.</li>
325 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Empty-Structures.html#Empty%20Structures">Empty Structures</a>: Structures with no members.</li>
326 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variadic-Macros.html#Variadic%20Macros">Variadic Macros</a>: Macros with a variable number of arguments.</li>
327 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Escaped-Newlines.html#Escaped%20Newlines">Escaped Newlines</a>: Slightly looser rules for escaped newlines.</li>
328 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Subscripting.html#Subscripting">Subscripting</a>: Any array can be subscripted, even if not an lvalue.</li>
329 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Pointer-Arith.html#Pointer%20Arith">Pointer Arith</a>: Arithmetic on <code>void</code>-pointers and function pointers.</li>
330 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Initializers.html#Initializers">Initializers</a>: Non-constant initializers.</li>
331 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Compound-Literals.html#Compound%20Literals">Compound Literals</a>: Compound literals give structures, unions,
332 or arrays as values.</li>
333 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Designated-Inits.html#Designated%20Inits">Designated Inits</a>: Labeling elements of initializers.</li>
334 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Cast-to-Union.html#Cast%20to%20Union">Cast to Union</a>: Casting to union type from any member of the union.</li>
335 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Case-Ranges.html#Case%20Ranges">Case Ranges</a>: `case 1 ... 9' and such.</li>
336 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Mixed-Declarations.html#Mixed%20Declarations">Mixed Declarations</a>: Mixing declarations and code.</li>
337 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Function-Prototypes.html#Function%20Prototypes">Function Prototypes</a>: Prototype declarations and old-style definitions.</li>
338 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/C_002b_002b-Comments.html#C_002b_002b-Comments">C++ Comments</a>: C++ comments are recognized.</li>
339 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Dollar-Signs.html#Dollar%20Signs">Dollar Signs</a>: Dollar sign is allowed in identifiers.</li>
340 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Character-Escapes.html#Character%20Escapes">Character Escapes</a>: <code>\e</code> stands for the character <ESC>.</li>
341 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Alignment.html#Alignment">Alignment</a>: Inquiring about the alignment of a type or variable.</li>
342 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Inline.html#Inline">Inline</a>: Defining inline functions (as fast as macros).</li>
343 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Alternate-Keywords.html#Alternate%20Keywords">Alternate Keywords</a>:<code>__const__</code>, <code>__asm__</code>, etc., for header files.</li>
344 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Incomplete-Enums.html#Incomplete%20Enums">Incomplete Enums</a>: <code>enum foo;</code>, with details to follow.</li>
345 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Function-Names.html#Function%20Names">Function Names</a>: Printable strings which are the name of the current function.</li>
346 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Return-Address.html#Return%20Address">Return Address</a>: Getting the return or frame address of a function.</li>
347 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Unnamed-Fields.html#Unnamed%20Fields">Unnamed Fields</a>: Unnamed struct/union fields within structs/unions.</li>
348 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Attribute-Syntax.html#Attribute%20Syntax">Attribute Syntax</a>: Formal syntax for attributes.</li>
353 <p>If you run into GCC extensions which have not been included in any of these
354 lists, please let us know (also including whether or not they work).</p>
358 <!-- ======================================================================= -->
359 <div class="doc_subsection">
360 <a name="c++-fe">Known problems with the C++ front-end</a>
363 <div class="doc_text">
365 <p>For this release, the C++ front-end is considered to be fully
366 tested and works for a number of non-trivial programs, including LLVM
371 <!-- _______________________________________________________________________ -->
372 <div class="doc_subsubsection">Bugs</div>
374 <div class="doc_text">
377 <li>The C++ front-end inherits all problems afflicting the <a href="#c-fe">C
384 <!-- _______________________________________________________________________ -->
385 <div class="doc_subsubsection">
389 <div class="doc_text">
393 <li>The C++ front-end is based on a pre-release of the GCC 3.4 C++ parser. This
394 parser is significantly more standards compliant (and picky) than prior GCC
395 versions. For more information, see the C++ section of the <a
396 href="http://gcc.gnu.org/gcc-3.4/changes.html">GCC 3.4 release notes</a>.</li>
398 <li>Destructors for local objects are not always run when a <tt>longjmp</tt> is
399 performed. In particular, destructors for objects in the <tt>longjmp</tt>ing
400 function and in the <tt>setjmp</tt> receiver function may not be run.
401 Objects in intervening stack frames will be destroyed, however (which is
402 better than most compilers).</li>
404 <li>The LLVM C++ front-end follows the <a
405 href="http://www.codesourcery.com/cxx-abi">Itanium C++ ABI</a>.
406 This document, which is not Itanium specific, specifies a standard for name
407 mangling, class layout, v-table layout, RTTI formats, and other C++
408 representation issues. Because we use this API, code generated by the LLVM
409 compilers should be binary compatible with machine code generated by other
410 Itanium ABI C++ compilers (such as G++, the Intel and HP compilers, etc).
411 <i>However</i>, the exception handling mechanism used by LLVM is very
412 different from the model used in the Itanium ABI, so <b>exceptions will not
413 interact correctly</b>. </li>
419 <!-- ======================================================================= -->
420 <div class="doc_subsection">
421 <a name="c-be">Known problems with the C back-end</a>
424 <div class="doc_text">
428 <li>The C back-end produces code that violates the ANSI C Type-Based Alias
429 Analysis rules. As such, special options may be necessary to compile the code
430 (for example, GCC requires the <tt>-fno-strict-aliasing</tt> option). This
431 problem probably cannot be fixed.</li>
433 <li><a href="http://llvm.cs.uiuc.edu/PR56">Zero arg vararg functions are not
434 supported</a>. This should not affect LLVM produced by the C or C++
441 <!-- ======================================================================= -->
442 <div class="doc_subsection">
443 <a name="x86-be">Known problems with the X86 back-end</a>
446 <div class="doc_text">
449 <li><a href="http://llvm.cs.uiuc.edu/PR566">Memory Mapped I/O Intrinsics do not fence memory</a></li>
454 <!-- ======================================================================= -->
455 <div class="doc_subsection">
456 <a name="ppc-be">Known problems with the PowerPC back-end</a>
459 <div class="doc_text">
467 <!-- ======================================================================= -->
468 <div class="doc_subsection">
469 <a name="sparcv9-be">Known problems with the SparcV9 back-end</a>
472 <div class="doc_text">
475 <li><a href="http://llvm.cs.uiuc.edu/PR60">[sparcv9] SparcV9 backend miscompiles
476 several programs in the LLVM test suite</a></li>
481 <!-- ======================================================================= -->
482 <div class="doc_subsection">
483 <a name="alpha-be">Known problems with the Alpha back-end</a>
486 <div class="doc_text">
490 <li>On 21164s, some rare FP arithmetic sequences which may trap do not have the
491 appropriate nops inserted to ensure restartability.</li>
493 <li>Defining vararg functions is not supported (but calling them is ok).</li>
495 <li>Due to the vararg problems, C++ exceptions do not work. Small changes are required to the CFE (which break correctness in the exception handler) to compile the exception handling library (and thus the C++ standard library).</li>
501 <!-- ======================================================================= -->
502 <div class="doc_subsection">
503 <a name="ia64-be">Known problems with the IA64 back-end</a>
506 <div class="doc_text">
510 <li>C++ programs are likely to fail on IA64, as calls to <tt>setjmp</tt> are
511 made where the argument is not 16-byte aligned, as required on IA64. (Strictly
512 speaking this is not a bug in the IA64 back-end; it will also be encountered
513 when building C++ programs using the C back-end.)</li>
515 <li>The C++ front-end does not use <a href="http://llvm.cs.uiuc.edu/PR406">IA64
516 ABI compliant layout of v-tables</a>. In particular, it just stores function
517 pointers instead of function descriptors in the vtable. This bug prevents
518 mixing C++ code compiled with LLVM with C++ objects compiled by other C++
521 <li>There are a few ABI violations which will lead to problems when mixing LLVM
522 output with code built with other compilers, particularly for floating-point
525 <li>Defining vararg functions is not supported (but calling them is ok).</li>
531 <!-- ======================================================================= -->
532 <div class="doc_subsection">
533 <a name="sparcv8">Known problems with the SPARC-V8 back-end</a>
536 <div class="doc_text">
539 <li>Many features are still missing (e.g. support for 64-bit integer
542 <li>This backend needs to be updated to use the SelectionDAG instruction
543 selection framework.</li>
548 <!-- *********************************************************************** -->
549 <div class="doc_section">
550 <a name="additionalinfo">Additional Information</a>
552 <!-- *********************************************************************** -->
554 <div class="doc_text">
556 <p>A wide variety of additional information is available on the <a
557 href="http://llvm.cs.uiuc.edu">LLVM web page</a>, including <a
558 href="http://llvm.cs.uiuc.edu/docs/">documentation</a> and <a
559 href="http://llvm.cs.uiuc.edu/pubs/">publications describing algorithms and
560 components implemented in LLVM</a>. The web page also contains versions of the
561 API documentation which is up-to-date with the CVS version of the source code.
562 You can access versions of these documents specific to this release by going
563 into the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p>
565 <p>If you have any questions or comments about LLVM, please feel free to contact
566 us via the <a href="http://llvm.cs.uiuc.edu/docs/#maillist"> mailing
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