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2 <html><head><title>LLVM 1.1 Release Notes</title></head>
5 <table width="100%" bgcolor="#330077" border=0 cellpadding=4 cellspacing=0>
6 <tr><td> <font size=+3 color="#EEEEFF" face="Georgia,Palatino,Times,Roman"><b>LLVM 1.1 Release Notes</b></font></td>
10 <li><a href="#intro">Introduction</a>
11 <li><a href="#whatsnew">What's New?</a>
12 <li><a href="#portability">Portability and Supported Platforms</a>
13 <li><a href="#install-instructions">Installation Instructions</a>
14 <li><a href="#knownproblems">Known Problems</a>
16 <!-- <li><a href="#portabilityprobs">Portability Problems</a> -->
17 <li><a href="#core">Known problems with the LLVM Core</a>
18 <li><a href="#c-fe">Known problems with the C Front-end</a>
19 <li><a href="#c++-fe">Known problems with the C++ Front-end</a>
20 <li><a href="#x86-be">Known problems with the X86 Back-end</a>
21 <li><a href="#sparc-be">Known problems with the Sparc Back-end</a>
22 <li><a href="#c-be">Known problems with the C back-end</a>
24 <li><a href="#additionalinfo">Additional Information</a>
27 <p><b>Written by <a href="mailto:sabre@nondot.org">Chris Lattner</a></b><p>
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32 <table width="100%" bgcolor="#330077" border=0 cellpadding=4 cellspacing=0>
33 <tr><td align=center><font color="#EEEEFF" size=+2 face="Georgia,Palatino"><b>
34 <a name="intro">Introduction
35 </b></font></td></tr></table><ul>
36 <!-- *********************************************************************** -->
38 This document contains the release notes for the LLVM compiler infrastructure,
39 release 1.1. Here we describe the status of LLVM, including any known problems,
40 and bug fixes from the previous release. The most up-to-date version of this
41 document can be found on the <a
42 href="http://llvm.cs.uiuc.edu/releases/1.1/">LLVM 1.1 web site</a>. If you are
43 not reading this on the LLVM web pages, you should probably go there, because
44 this document may be updated after the release.<p>
46 For more information about LLVM, including information about potentially more
47 current releases, please check out the <a href="http://llvm.cs.uiuc.edu">main
48 web site</a>. If you have questions or comments, the <a
49 href="http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVM developer's mailing
50 list</a> is a good place to send them.<p>
52 Note that if you are reading this file from CVS, that this document applies to
53 the <i>next</i> release, not the previous one. To see the release notes for the
54 previous release, see the <a href="http://llvm.cs.uiuc.edu/releases/">releases
57 <!-- *********************************************************************** -->
58 </ul><table width="100%" bgcolor="#330077" border=0 cellpadding=4 cellspacing=0>
59 <tr><td align=center><font color="#EEEEFF" size=+2 face="Georgia,Palatino"><b>
60 <a name="whatsnew">What's New?
61 </b></font></td></tr></table><ul>
62 <!-- *********************************************************************** -->
64 This is the second public release of the LLVM compiler infrastructure. This
65 release implements the following new features:<p>
73 In this release, the following Quality of Implementation issues were fixed:<p>
76 <li><a href="http://llvm.cs.uiuc.edu/PR29">C++ front-end is not generating linkonce linkage type when it can</a></li>
79 In this release, the following bugs in the previous release were fixed:<p>
82 <li><a href="http://llvm.cs.uiuc.edu/PR57">[inliner] Inlining invoke with PHI in unwind target is broken</a></li>
83 <li><a href="http://llvm.cs.uiuc.edu/PR58">[linker] linkonce globals should link successfully to external globals</a></li>
84 <li><a href="http://llvm.cs.uiuc.edu/PR59">C++ frontend can crash when compiling virtual base classes</a></li>
85 <li><a href="http://llvm.cs.uiuc.edu/PR62">C backend fails on constant cast expr to ptr-to-anonymous struct</a></li>
86 <li><a href="http://llvm.cs.uiuc.edu/PR63">#ident is not recognized by C frontend</a></li>
87 <li><a href="http://llvm.cs.uiuc.edu/PR64">[constmerge] Constant merging pass merges constants with external linkage</a></li>
88 <li><a href="http://llvm.cs.uiuc.edu/PR65">C front-end miscompiles the builtin_expect intrinsic!</a></li>
89 <li><a href="http://llvm.cs.uiuc.edu/PR66">[scalarrepl] Scalar Replacement of aggregates is decimating structures it shouldn't be</a></li>
90 <li><a href="http://llvm.cs.uiuc.edu/PR67">1.0 precompiled libstdc++ does not include wchar_t support</a></li>
91 <li><a href="http://llvm.cs.uiuc.edu/PR68">llvmgcc asserts when compiling functions renamed with asm's</a></li>
92 <li><a href="http://llvm.cs.uiuc.edu/PR69">C frontend crashes on some programs with lots of types.</a></li>
93 <li><a href="http://llvm.cs.uiuc.edu/PR70">[instcombine] Resolving invoke inserts cast after terminator</a></li>
96 At this time, LLVM is known to work properly with SPEC CPU 2000, the Olden
97 benchmarks, and the Ptrdist benchmarks among many other programs. Note however
98 that the Sparc and X86 backends do not currently support exception throwing or
99 long jumping (including 253.perlbmk in SPEC). For these programs you must use
103 <!-- *********************************************************************** -->
104 </ul><table width="100%" bgcolor="#330077" border=0 cellpadding=4 cellspacing=0>
105 <tr><td align=center><font color="#EEEEFF" size=+2 face="Georgia,Palatino"><b>
106 <a name="portability">Portability and Supported Platforms
107 </b></font></td></tr></table><ul>
108 <!-- *********************************************************************** -->
110 LLVM has only been extensively tested on Intel and AMD machines running Red
111 Hat Linux, and Sun UltraSPARC workstations running Solaris 8.
112 The core LLVM infrastructure uses "autoconf" for portability, so hopefully we
113 work on more platforms than that. However, it is extremely likely that we
114 missed something. We welcome portability patches and error messages.<p>
117 <!-- *********************************************************************** -->
118 </ul><table width="100%" bgcolor="#330077" border=0 cellpadding=4 cellspacing=0>
119 <tr><td align=center><font color="#EEEEFF" size=+2 face="Georgia,Palatino"><b>
120 <a name="knownproblems">Known Problems
121 </b></font></td></tr></table><ul>
122 <!-- *********************************************************************** -->
124 This section contains all known problems with the LLVM system, listed by
125 component. As new problems are discovered, they will be added to these
129 <!-- _______________________________________________________________________ -->
131 </ul><h4><a name="portability"><hr size=0>Portability Problems</h4><ul>
135 <!-- _______________________________________________________________________ -->
136 </ul><h4><a name="core"><hr size=0>Known problems with the LLVM Core</h4><ul>
138 <li>In the JIT, <tt>dlsym</tt> on a symbol compiled by the JIT will not work.<p>
140 <li>The JIT does not use mutexes to protect its internal data structures. As
141 such, execution of a threaded program could cause these data structures to
144 <li>It is not possible to <tt>dlopen</tt> an LLVM bytecode file in the JIT.<p>
146 <li>Linking in static archive files (.a files) is very slow (there is no symbol
147 table in the archive).
149 <!-- _______________________________________________________________________ -->
150 </ul><h4><a name="c-fe"><hr size=0>Known problems with the C front-end</h4><ul>
152 </ul><b>Bugs:</b><ul><p>
154 <li><a href="http://llvm.cs.uiuc.edu/PR6">Oversized integer bitfields cause crash</a>.<p>
156 <li>C99 Variable sized arrays do not release stack memory when they go out of
157 scope. Thus, the following program may run out of stack space:
159 for (i = 0; i != 1000000; ++i) {
165 </ul><b>Notes:</b><ul><p>
167 <li>Inline assembly is not yet supported.<p>
169 <li>"long double" is transformed by the front-end into "double". There is no
170 support for floating point data types of any size other than 32 and 64 bits.
173 <li>The following Unix system functionality has not been tested and may not work:
175 <li><tt>sigsetjmp</tt>, <tt>siglongjmp</tt> - These are not turned into the
176 appropriate <tt>invoke</tt>/<tt>unwind</tt> instructions. Note that
177 <tt>setjmp</tt> and <tt>longjmp</tt> <em>are</em> compiled correctly.
178 <li><tt>getcontext</tt>, <tt>setcontext</tt>, <tt>makecontext</tt>
179 - These functions have not been tested.
182 <li>Although many GCC extensions are supported, some are not. In particular,
183 the following extensions are known to <b>not be</b> supported:
185 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Local-Labels.html#Local%20Labels">Local Labels</a>: Labels local to a block.
186 <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.
187 <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.
188 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Constructing-Calls.html#Constructing%20Calls">Constructing Calls</a>: Dispatching a call to another function.
189 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Extended-Asm.html#Extended%20Asm">Extended Asm</a>: Assembler instructions with C expressions as operands.
190 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Constraints.html#Constraints">Constraints</a>: Constraints for asm operands
191 <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.
192 <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.
193 <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.
194 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Vector-Extensions.html#Vector%20Extensions">Vector Extensions</a>: Using vector instructions through built-in functions.
195 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Target-Builtins.html#Target%20Builtins">Target Builtins</a>: Built-in functions specific to particular targets.
196 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Thread-Local.html#Thread-Local">Thread-Local</a>: Per-thread variables.
197 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Pragmas.html#Pragmas">Pragmas</a>: Pragmas accepted by GCC.
200 The following GCC extensions are <b>partially</b> supported. An ignored
201 attribute means that the LLVM compiler ignores the presence of the attribute,
202 but the code should still work. An unsupported attribute is one which is
203 ignored by the LLVM compiler, which will cause a different interpretation of
207 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Length.html#Variable%20Length">Variable Length</a>:
208 Arrays whose length is computed at run time.<br>
209 Supported, but allocated stack space is not freed until the function returns (noted above).
211 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html#Function%20Attributes">Function Attributes</a>:
212 Declaring that functions have no side effects, or that they can never return.<br>
213 <b>Supported:</b> <tt>format</tt>, <tt>format_arg</tt>, <tt>non_null</tt>, <tt>constructor</tt>, <tt>destructor</tt>, <tt>unused</tt>, <tt>deprecated</tt>,
214 <tt>warn_unused_result</tt>, <tt>weak</tt><br>
215 <b>Ignored:</b> <tt>noreturn</tt>, <tt>noinline</tt>, <tt>always_inline</tt>, <tt>pure</tt>, <tt>const</tt>, <tt>nothrow</tt>, <tt>malloc</tt>
216 <tt>no_instrument_function</tt>, <tt>cdecl</tt><br>
217 <b>Unsupported:</b> <tt>used</tt>, <tt>section</tt>, <tt>alias</tt>, <tt>visibility</tt>, <tt>regparm</tt>, <tt>stdcall</tt>,
218 <tt>fastcall</tt>, all other target specific attributes
220 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Attributes.html#Variable%20Attributes">Variable Attributes</a>:
221 Specifying attributes of variables.<br>
222 <b>Supported:</b> <tt>cleanup</tt>, <tt>common</tt>, <tt>nocommon</tt>,
223 <tt>deprecated</tt>, <tt>transparent_union</tt>,
224 <tt>unused</tt>, <tt>weak</tt><br>
225 <b>Unsupported:</b> <tt>aligned</tt>, <tt>mode</tt>, <tt>packed</tt>,
226 <tt>section</tt>, <tt>shared</tt>, <tt>tls_model</tt>,
227 <tt>vector_size</tt>, <tt>dllimport</tt>,
228 <tt>dllexport</tt>, all target specific attributes.<br>
230 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Type-Attributes.html#Type%20Attributes">Type Attributes</a>: Specifying attributes of types.
231 <b>Supported:</b> <tt>transparent_union</tt>, <tt>unused</tt>,
232 <tt>deprecated</tt>, <tt>may_alias</tt>
233 <b>Unsupported:</b> <tt>aligned</tt>, <tt>packed</tt>
234 all target specific attributes.<br>
235 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html#Other%20Builtins">Other Builtins</a>:
236 Other built-in functions.<br>
237 We support all builtins which have a C language equivalent (e.g.,
238 <tt>__builtin_cos</tt>), <tt>__builtin_alloca</tt>,
239 <tt>__builtin_types_compatible_p</tt>, <tt>__builtin_choose_expr</tt>,
240 <tt>__builtin_constant_p</tt>, and <tt>__builtin_expect</tt> (ignored).
244 The following extensions <b>are</b> known to be supported:
246 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html#Statement%20Exprs">Statement Exprs</a>: Putting statements and declarations inside expressions.
247 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Typeof.html#Typeof">Typeof</a>: <code>typeof</code>: referring to the type of an expression.
248 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Lvalues.html#Lvalues">Lvalues</a>: Using <code>?:</code>, "<code>,</code>" and casts in lvalues.
249 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Conditionals.html#Conditionals">Conditionals</a>: Omitting the middle operand of a <code>?:</code> expression.
250 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Long-Long.html#Long%20Long">Long Long</a>: Double-word integers.
251 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Complex.html#Complex">Complex</a>: Data types for complex numbers.
252 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Hex-Floats.html#Hex%20Floats">Hex Floats</a>:Hexadecimal floating-point constants.
253 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html#Zero%20Length">Zero Length</a>: Zero-length arrays.
254 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Empty-Structures.html#Empty%20Structures">Empty Structures</a>: Structures with no members.
255 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variadic-Macros.html#Variadic%20Macros">Variadic Macros</a>: Macros with a variable number of arguments.
256 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Escaped-Newlines.html#Escaped%20Newlines">Escaped Newlines</a>: Slightly looser rules for escaped newlines.
257 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Subscripting.html#Subscripting">Subscripting</a>: Any array can be subscripted, even if not an lvalue.
258 <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.
259 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Initializers.html#Initializers">Initializers</a>: Non-constant initializers.
260 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Compound-Literals.html#Compound%20Literals">Compound Literals</a>: Compound literals give structures, unions or arrays as values.
261 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Designated-Inits.html#Designated%20Inits">Designated Inits</a>: Labeling elements of initializers.
263 <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.
264 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Case-Ranges.html#Case%20Ranges">Case Ranges</a>: `case 1 ... 9' and such.
265 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Mixed-Declarations.html#Mixed%20Declarations">Mixed Declarations</a>: Mixing declarations and code.
267 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Function-Prototypes.html#Function%20Prototypes">Function Prototypes</a>: Prototype declarations and old-style definitions.
268 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/C---Comments.html#C++%20Comments">C++ Comments</a>: C++ comments are recognized.
269 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Dollar-Signs.html#Dollar%20Signs">Dollar Signs</a>: Dollar sign is allowed in identifiers.
270 <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>.
271 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Alignment.html#Alignment">Alignment</a>: Inquiring about the alignment of a type or variable.
272 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Inline.html#Inline">Inline</a>: Defining inline functions (as fast as macros).
273 <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.
274 <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.
275 <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.
276 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Unnamed-Fields.html#Unnamed%20Fields">Unnamed Fields</a>: Unnamed struct/union fields within structs/unions.
277 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Attribute-Syntax.html#Attribute%20Syntax">Attribute Syntax</a>: Formal syntax for attributes.
280 If you run into GCC extensions which have not been included in any of these
281 lists, please let us know (also including whether or not they work).
284 <!-- _______________________________________________________________________ -->
285 </ul><h4><a name="c++-fe"><hr size=0>Known problems with the C++ front-end</h4><ul>
287 For this release, the C++ front-end is considered to be fully functional but
288 of <b>beta</b> quality. It has been tested and works for a number of simple programs that collectively exercise most of the language. Nevertheless, it has not been in use as long as the C front-end. Please report any bugs or problems.<p>
290 </ul><b>Bugs</b>:<ul><p>
292 <li>The C++ front-end inherits all problems afflicting the <a href="#c-fe">C
295 </ul><b>Notes</b>:<ul><p>
297 <li>The C++ front-end is based on a pre-release of the GCC 3.4 C++ parser. This
298 parser is significantly more standards compliant (and picky) than prior GCC
299 versions. For more information, see the C++ section of the <a
300 href="http://gcc.gnu.org/gcc-3.4/changes.html">GCC 3.4 release notes</a>.<p>
302 <li>Destructors for local objects are not always run when a <tt>longjmp</tt> is
303 performed. In particular, destructors for objects in the <tt>longjmp</tt>ing
304 function and in the <tt>setjmp</tt> receiver function may not be run.
305 Objects in intervening stack frames will be destroyed however (which is
306 better than most compilers).<p>
308 <li>The LLVM C++ front-end follows the <a
309 href="http://www.codesourcery.com/cxx-abi">Itanium C++ ABI</a>.
310 This document, which is not Itanium specific, specifies a standard for name
311 mangling, class layout, v-table layout, RTTI formats, and other C++
312 representation issues. Because we use this API, code generated by the LLVM
313 compilers should be binary compatible with machine code generated by other
314 Itanium ABI C++ compilers (such as G++, the Intel and HP compilers, etc).
315 <i>However</i>, the exception handling mechanism used by LLVM is very
316 different from the model used in the Itanium ABI, so <b>exceptions will not
317 interact correctly</b> .
319 <li><a href="http://llvm.cs.uiuc.edu/PR11">Code for executing destructors when
320 unwinding is not shared</a> (this is a quality of implementation problem,
321 which does not effect functionality).<p>
324 <!-- _______________________________________________________________________ -->
325 </ul><h4><a name="x86-be"><hr size=0>Known problems with the X86 back-end</h4><ul>
327 <li>The X86 code generator <a
328 href="http://llvm.cs.uiuc.edu/PR16">does not currently
329 support the <tt>unwind</tt> instruction</a>, so code that throws a C++ exception
330 or calls the C <tt>longjmp</tt> function will abort.<p>
333 <!-- _______________________________________________________________________ -->
334 </ul><h4><a name="sparc-be"><hr size=0>Known problems with the Sparc back-end</h4><ul>
336 <li>The Sparc code generator <a
337 href="http://llvm.cs.uiuc.edu/PR15">does not currently
338 support the <tt>unwind</tt> instruction</a>, so code that throws a C++ exception
339 or calls the C <tt>longjmp</tt> function will abort.<p>
342 <!-- _______________________________________________________________________ -->
343 </ul><h4><a name="c-be"><hr size=0>Known problems with the C back-end</h4><ul>
345 <li>The C back-end produces code that violates the ANSI C Type-Based Alias
346 Analysis rules. As such, special options may be necessary to compile the code
347 (for example, GCC requires the <tt>-fno-strict-aliasing</tt> option). This
348 problem probably cannot be fixed.<p>
350 <li><a href="http://llvm.cs.uiuc.edu/PR33">Initializers for global variables</a>
351 cannot include special floating point numbers like Not-A-Number or Infinity.<p>
353 <li><a href="http://zion.cs.uiuc.edu/PR56">Zero arg vararg functions are not
354 supported</a>. This should not affect LLVM produced by the C or C++
357 <li>The code produces by the C back-end has only been tested with the Sun CC and
358 GCC compilers. It is possible that it will have to be adjusted to support other
363 <!-- *********************************************************************** -->
364 </ul><table width="100%" bgcolor="#330077" border=0 cellpadding=4 cellspacing=0>
365 <tr><td align=center><font color="#EEEEFF" size=+2 face="Georgia,Palatino"><b>
366 <a name="additionalinfo">Additional Information
367 </b></font></td></tr></table><ul>
368 <!-- *********************************************************************** -->
370 A wide variety of additional information is available on the LLVM web page,
371 including mailing lists publications describing algorithms and components
372 implemented in LLVM. The web page also contains versions of the API
373 documentation which is up-to-date with the CVS version of the source code. You
374 can access versions of these documents specific to this release by going into
375 the "<tt>llvm/doc/</tt>" directory in the LLVM tree.<p>
377 If you have any questions or comments about LLVM, please feel free to contact us
378 via the mailing lists.<p>
381 <!-- *********************************************************************** -->
383 <!-- *********************************************************************** -->
387 Maintained By: <a href="http://llvm.cs.uiuc.edu/">The LLVM Team</a><br>
388 <!-- Created: Wed Oct 1 17:38:54 CDT 2003 -->
390 Last modified: Wed Oct 29 19:18:55 CST 2003