<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<link rel="stylesheet" href="llvm.css" type="text/css">
- <title>LLVM 1.5 Release Notes</title>
+ <title>LLVM 1.7cvs Release Notes</title>
</head>
<body>
-<div class="doc_title">LLVM 1.5 Release Notes</div>
+<div class="doc_title">LLVM 1.7 Release Notes</div>
<ol>
<li><a href="#intro">Introduction</a></li>
</ol>
<div class="doc_author">
- <p>Written by the <a href="http://llvm.cs.uiuc.edu">LLVM Team</a><p>
+ <p>Written by the <a href="http://llvm.org">LLVM Team</a><p>
</div>
<!-- *********************************************************************** -->
<div class="doc_text">
<p>This document contains the release notes for the LLVM compiler
-infrastructure, release 1.5. Here we describe the status of LLVM, including any
+infrastructure, release 1.7. Here we describe the status of LLVM, including any
known problems and major improvements from the previous release. The most
up-to-date version of this document can be found on the <a
-href="http://llvm.cs.uiuc.edu/releases/1.5/">LLVM 1.5 web site</a>. If you are
+href="http://llvm.org/releases/">LLVM releases web site</a>. If you are
not reading this on the LLVM web pages, you should probably go there because
this document may be updated after the release.</p>
<p>For more information about LLVM, including information about the latest
-release, please check out the <a href="http://llvm.cs.uiuc.edu">main LLVM
+release, please check out the <a href="http://llvm.org/">main LLVM
web site</a>. If you have questions or comments, the <a
href="http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVM developer's mailing
list</a> is a good place to send them.</p>
<p>Note that if you are reading this file from CVS or the main LLVM web page,
this document applies to the <i>next</i> release, not the current one. To see
the release notes for the current or previous releases, see the <a
-href="http://llvm.cs.uiuc.edu/releases/">releases page</a>.</p>
+href="http://llvm.org/releases/">releases page</a>.</p>
</div>
<div class="doc_text">
-<p>This is the sixth public release of the LLVM Compiler Infrastructure.</p>
-
-<p> At this time, LLVM is known to correctly compile a wide range of C and C++
-programs, including the SPEC CPU95 & 2000 suite. It includes bug fixes for
-those problems found since the 1.4 release and a large number of new features
-and enhancements, described below.</p>
+<p>This is the seventh public release of the LLVM Compiler Infrastructure. This
+release incorporates a large number of enhancements and additions (primarily in
+the code generator), which combine to improve the quality of the code generated
+by LLVM by up to 30% in some cases. This release is also the first release to
+have first-class support for Mac OS X: all of the major bugs have been shaken
+out and it is now as well supported as Linux on X86.</p>
</div>
<!--=========================================================================-->
<div class="doc_subsection">
-<a name="newfeatures">New Features in LLVM 1.5</a>
+<a name="newfeatures">New Features in LLVM 1.7cvs</a>
</div>
-<!--_________________________________________________________________________-->
-<div class="doc_subsubsection"><a name="newcg">New Native Code
-Generators</a></div>
-
<div class="doc_text">
-<p>
-This release includes new native code generators for <a
-href="#alpha-be">Alpha</a>, <a href="#ia64-be">IA-64</a>, and <a
-href="#sparcv8">SPARC-V8</a> (32-bit SPARC). These code generators are still
-beta quality, but are progressing rapidly. The Alpha backend is implemented
-with an eye towards being compatible with the widely used SimpleScalar
-simulator.
-</p>
-</div>
-
-<!--_________________________________________________________________________-->
-<div class="doc_subsubsection"><a name="selectiondag">New Instruction
-Selector Framework</a></div>
-
-<div class="doc_text">
-<p>This release includes a <a href="CodeGenerator.html#instselect">new framework
-for building instruction selectors</a>, which has long been the hardest part of
-building a new LLVM target. This framework handles a lot of the mundane (but
-easy to get wrong) details of writing the instruction selector, such as
-generating efficient code for <a
-href="LangRef.html#i_getelementptr">getelementptr</a> instructions, promoting
-small integer types to larger types (e.g. for RISC targets with one size of
-integer registers), expanding 64-bit integer operations for 32-bit hosts, etc.
-Currently, the X86, PowerPC, Alpha, and IA-64 backends use this framework. The
-SPARC backends will be migrated when time permits.
-</p>
-</div>
-
-<!--_________________________________________________________________________-->
-<div class="doc_subsubsection"><a name="customccs">New Support for Per-Function
-Calling Conventions</a></div>
-
-<div class="doc_text">
-<p>LLVM 1.5 adds supports for <a href="LangRef.html#callingconv">per-function
-calling conventions</a>. Traditionally, the LLVM code generators match the
-native C calling conventions for a target. This is important for compatibility,
-but is not very flexible. This release allows custom calling conventions to be
-established for functions, and defines three target-independent conventions (<a
-href="LangRef.html#callingconv">C call, fast call, and cold call</a>) which may
-be supported by code generators. When possible, the LLVM optimizer promotes C
-functions to use the "fastcc" convention, allowing the use of more efficient
-calling sequences (e.g., parameters are passed in registers in the X86 target).
-</p>
-
-<p>Targets may now also define target-specific calling conventions, allowing
-LLVM to fully support calling convention altering options (e.g. GCC's
-<tt>-mregparm</tt> flag) and well-defined target conventions (e.g. stdcall and
-fastcall on X86).</p>
-</div>
-
-<!--_________________________________________________________________________-->
-<div class="doc_subsubsection"><a name="tailcalls">New Support for
-Proper Tail Calls</a></div>
-
-<div class="doc_text">
-<p>The release now includes support for <a
-href="http://doi.acm.org/10.1145/277650.277719">proper tail calls</a>, as
-required to implement languages like Scheme. Tail calls make use of two
-features: custom calling conventions (described above), which allow the code
-generator to emit code for the caller to deallocate its own stack when it
-returns. The second feature is a flag on the <a href="LangRef.html#i_call">call
-instruction</a>, which indicates that the callee does not access the caller's
-stack frame (indicating that it is acceptable to deallocate the caller stack
-before invoking the callee). LLVM proper tail calls run on the system stack (as
-do normal calls), supports indirect tail calls, tail calls with arbitrary
-numbers of arguments, tail calls where the callee requires more argument space
-than the caller, etc. The only case not supported are varargs calls, but that
-could be added if desired.
-</p>
-
-<p>In order for a front-end to get guaranteed tail call, it must mark functions
-as "fastcc", mark calls with the 'tail' marker, and follow the call with a
-return of the called value (or void). The optimizer and code generator attempt
-to handle more general cases, but the simple case will always work if the code
-generator supports tail calls. Here is a simple example:</p>
-
-<pre>
- fastcc int %bar(int %X, int(double, int)* %FP) { ;<i> fastcc</i>
- %Y = tail call fastcc int %FP(double 0.0, int %X) ;<i> tail, fastcc</i>
- ret int %Y
- }
-</pre>
-
-<p>In LLVM 1.5, the X86 code generator is the only target that has been enhanced
-to support proper tail calls (other targets will be enhanced in future).
-Further, because this support was added very close to the release, it is
-disabled by default. Pass <tt>-enable-x86-fastcc</tt> to llc to enable it (this
-will be enabled by default in the next release). The example above compiles to:
-</p>
-
-<pre>
- bar:
- sub ESP, 8 # Callee uses more space than the caller
- mov ECX, DWORD PTR [ESP + 8] # Get the old return address
- mov DWORD PTR [ESP + 4], 0 # First half of 0.0
- mov DWORD PTR [ESP + 8], 0 # Second half of 0.0
- mov DWORD PTR [ESP], ECX # Put the return address where it belongs
- jmp EDX # Tail call "FP"
-</pre>
-
-<p>
-With fastcc on X86, the first two integer arguments are passed in EAX/EDX, the
-callee pops its arguments off the stack, and the argument area is always a
-multiple of 8 bytes in size.
-</p>
-
-</div>
-
-<!--_________________________________________________________________________-->
-<div class="doc_subsubsection">Other New Features</div>
-
-<div class="doc_text">
-<ol>
- <li>LLVM now includes an <a href="http://llvm.cs.uiuc.edu/PR415">
- Interprocedural Sparse Conditional Constant Propagation</a> pass, named
- -ipsccp, which is run by default at link-time.</li>
- <li>LLVM 1.5 is now about 15% faster than LLVM 1.4 and its core data
- structures use about 30% less memory.</li>
- <li>Support for Microsoft Visual Studio is improved, and <a
- href="GettingStartedVS.html">now documented</a>.</li>
- <li><a href="GettingStarted.html#config">Configuring LLVM to build a subset
- of the available targets</a> is now implemented, via the
- <tt>--enable-targets=</tt> option.</li>
- <li>LLVM can now create native shared libraries with '<tt>llvm-gcc ...
- -shared -Wl,-native</tt>' (or with <tt>-Wl,-native-cbe</tt>).</li>
- <li>LLVM now supports a new "<a href="LangRef.html#i_prefetch">llvm.prefetch
- </a>" intrinsic, and llvm-gcc now supports __builtin_prefetch.
- <li>LLVM now supports intrinsics for <a href="LangRef.html#int_count">bit
- counting</a> and llvm-gcc now implements the GCC
- <tt>__builtin_popcount</tt>, <tt>__builtin_ctz</tt>, and
- <tt>__builtin_clz</tt> builtins.</li>
- <li>LLVM now mostly builds on HP-UX with the HP aCC Compiler.</li>
- <li>The LLVM X86 backend can now emit Cygwin-compatible .s files.</li>
- <li>LLVM now includes workarounds in the code generator generator which
- reduces the likelyhood of <a href="http://llvm.cs.uiuc.edu/PR448">GCC
- hitting swap during optimized builds</a>.</li>
- <li>The PowerPC backend generates far better code than in LLVM 1.4.</li>
-</ol>
+<ul>
+<li>New C front-end.</li>
+<li>New SPARC backend.</li>
+<li>Inline assembly support.</li>
+</ul>
</div>
<!--=========================================================================-->
<div class="doc_subsection">
-<a name="codequality">Code Quality Improvements in LLVM 1.5</a>
+<a name="changes">Significant changes in LLVM 1.7cvs</a>
</div>
<div class="doc_text">
-<ol>
-<li>The -globalopt pass now promotes non-address-taken static globals that are
-only accessed in main to SSA registers.</li>
-
-<li>The new -simplify-libcalls pass improves code generated for well-known
-library calls. The pass optimizes calls to many of the string, memory, and
-standard I/O functions (e.g. replace the calls with simpler/faster calls) when
-possible, given information known statically about the arguments to the call.
-</li>
-
-<li>Loops with trip counts based on array pointer comparisons (e.g. "<tt>for (i
-= 0; &A[i] != &A[100]; ++i) ...</tt>") are optimized better than before,
-which primarily helps iterator-intensive C++ codes.</li>
-
-<li>The code generator now uses information about takes advantage of commutative
-two-address instructions when performing register allocation.</li>
-
-<li>The optimizer now eliminates simple cases where redundant conditions exist
-between neighboring blocks.</li>
-
-<li>The reassociation pass (which turns (1+X+3) into (X+1+3) among other
-things), is more aggressive an intelligent.</li>
-
-</ol>
-</div>
-
-<!--=========================================================================-->
-<div class="doc_subsection">
-<a name="bugfix">Significant Bugs Fixed in LLVM 1.5</a>
+<ul>
+<li>Removed the llvm.readport/llvm.writeport/llvm.readio/llvm.writeio
+ intrinsics.</li>
+<li>Separated the other intrinsics based on type.</li>
+</ul>
</div>
-<div class="doc_text">
-
-
-<p>Bugs fixed in the LLVM Core:</p>
-<ol>
- <li><a href="http://llvm.cs.uiuc.edu/PR491">[dse] DSE deletes stores that
- are partially overwritten by smaller stores</a></li>
- <li><a href="http://llvm.cs.uiuc.edu/PR548">[instcombine] miscompilation of
- setcc or setcc in one case</a></li>
- <li>Transition code for LLVM 1.0 style varargs was removed from the .ll file
- parser. LLVM 1.0 bytecode files are still supported. </li>
-</ol>
-
-<p>Code Generator Bugs:</p>
-<ol>
- <li><a href="http://llvm.cs.uiuc.edu/PR490">[cbackend] Logical constant
- expressions (and/or/xor) not implemented</a>.</li>
- <li><a href="http://llvm.cs.uiuc.edu/PR511">[cbackend] C backend does not
- respect 'volatile'</a>.</li>
- <li>The JIT sometimes miscompiled globals and constant pool entries for
- 64-bit integer constants on 32-bit hosts.</li>
-</ol>
-
-<p>Bugs in the C/C++ front-end:</p>
-<ol>
- <li><a href="http://llvm.cs.uiuc.edu/PR487">[llvmgcc] llvm-gcc incorrectly
- rejects some constant initializers involving the addresses of array
- elements</a></li>
- <li><a href="http://llvm.cs.uiuc.edu/PR501">[llvm-g++] Crash compiling
- anonymous union</a></li>
- <li><a href="http://llvm.cs.uiuc.edu/PR509">[llvm-g++] Do not use dynamic
- initialization where static init will do</a></li>
- <li><a href="http://llvm.cs.uiuc.edu/PR510">[llvmgcc] Field offset
- miscalculated for some structure fields following bit fields</a></li>
- <li><a href="http://llvm.cs.uiuc.edu/PR513">[llvm-g++] Temporary lifetimes
- incorrect for short circuit logical operations</a></li>
- <li><a href="http://llvm.cs.uiuc.edu/PR517">[llvm-gcc] Crash compiling
- bitfield <-> aggregate assignment</a></li>
- <li><a href="http://llvm.cs.uiuc.edu/PR520">[llvm-g++] Error compiling
- virtual function thunk with an unnamed argument</a></li>
- <li><a href="http://llvm.cs.uiuc.edu/PR522">[llvm-gcc] Crash on certain
- C99 complex number routines</a></li>
- <li><a href="http://llvm.cs.uiuc.edu/PR529">[llvm-g++] Crash using placement
- new on an array type</a></li>
-</ol>
-
-</div>
<!-- *********************************************************************** -->
<div class="doc_section">
<p>LLVM is known to work on the following platforms:</p>
<ul>
-<li>Intel and AMD machines running Red Hat Linux and FreeBSD (and probably
- other unix-like systems).</li>
+ <li>Intel and AMD machines running Red Hat Linux, Fedora Core and FreeBSD
+ (and probably other unix-like systems).</li>
<li>Sun UltraSPARC workstations running Solaris 8.</li>
<li>Intel and AMD machines running on Win32 with the Cygwin libraries (limited
support is available for native builds with Visual C++).</li>
-<li>PowerPC-based Mac OS X systems, running 10.2 and above.</li>
+<li>PowerPC and X86-based Mac OS X systems, running 10.2 and above.</li>
<li>Alpha-based machines running Debian GNU/Linux.</li>
<li>Itanium-based machines running Linux and HP-UX.</li>
</ul>
<p>This section contains all known problems with the LLVM system, listed by
component. As new problems are discovered, they will be added to these
sections. If you run into a problem, please check the <a
-href="http://llvm.cs.uiuc.edu/bugs/">LLVM bug database</a> and submit a bug if
+href="http://llvm.org/bugs/">LLVM bug database</a> and submit a bug if
there isn't already one.</p>
</div>
<ul>
<li>The following passes are incomplete or buggy, and may be removed in future
- releases: <tt>-cee, -branch-combine, -instloops, -paths, -pre</tt></li>
+ releases: <tt>-cee</tt></li>
<li>The <tt>llvm-db</tt> tool is in a very early stage of development, but can
be used to step through programs and inspect the stack.</li>
-<li>The "iterative scan" register allocator (enabled with
- <tt>-regalloc=iterativescan</tt>) is not stable.</li>
-<li>The SparcV8, Alpha, and IA64 code generators are experimental.</li>
+<li>The IA64 code generator is experimental.</li>
+<li>The Alpha JIT is experimental.</li>
</ul>
</div>
+<!-- ======================================================================= -->
+<div class="doc_subsection">
+ <a name="build">Known problems with the Build System</a>
+</div>
+
+<div class="doc_text">
+
+<ul>
+ <li>The <a href="http://llvm.org/PR656">configure script sometimes fails on Solaris/Sparc</a>. A work around is documented in <a href="http://llvm.org/PR656">PR656.</a></li>
+</ul>
+</div>
+
+
<!-- ======================================================================= -->
<div class="doc_subsection">
<a name="core">Known problems with the LLVM Core</a>
<ul>
<li>In the JIT, <tt>dlsym()</tt> on a symbol compiled by the JIT will not
work.</li>
- <li>The JIT does not use mutexes to protect its internal data structures. As
- such, execution of a threaded program could cause these data structures to be
- corrupted.
- </li>
- <li><a href="http://llvm.cs.uiuc.edu/PR240">The lower-invoke pass does not
- mark values live across a setjmp as volatile</a>. This missing feature
- only affects targets whose setjmp/longjmp libraries do not save and restore
- the entire register file.</li>
</ul>
</div>
<div class="doc_subsubsection">Bugs</div>
<div class="doc_text">
+
+These bugs are known for the old front-end. The new GCC-4-based C front-end
+suffers from none of these.
+
<ul>
<li>C99 Variable sized arrays do not release stack memory when they go out of
scope. Thus, the following program may run out of stack space:
</pre></li>
<li>Initialization of global union variables can only be done <a
-href="http://llvm.cs.uiuc.edu/PR162">with the largest union member</a>.</li>
+href="http://llvm.org/PR162">with the largest union member</a>.</li>
</ul>
</div>
<ul>
-<li>Inline assembly is not yet supported.</li>
-
<li>"long double" is transformed by the front-end into "double". There is no
support for floating point data types of any size other than 32 and 64
bits.</li>
<b>Supported:</b> <tt>format</tt>, <tt>format_arg</tt>, <tt>non_null</tt>,
<tt>noreturn</tt>, <tt>constructor</tt>, <tt>destructor</tt>,
- <tt>unused</tt>,
+ <tt>unused</tt>, <tt>used</tt>,
<tt>deprecated</tt>, <tt>warn_unused_result</tt>, <tt>weak</tt><br>
<b>Ignored:</b> <tt>noinline</tt>,
<tt>always_inline</tt>, <tt>pure</tt>, <tt>const</tt>, <tt>nothrow</tt>,
<tt>malloc</tt>, <tt>no_instrument_function</tt>, <tt>cdecl</tt><br>
- <b>Unsupported:</b> <tt>used</tt>, <tt>section</tt>, <tt>alias</tt>,
+ <b>Unsupported:</b> <tt>section</tt>, <tt>alias</tt>,
<tt>visibility</tt>, <tt>regparm</tt>, <tt>stdcall</tt>,
<tt>fastcall</tt>, all other target specific attributes</li>
Specifying attributes of variables.<br>
<b>Supported:</b> <tt>cleanup</tt>, <tt>common</tt>, <tt>nocommon</tt>,
<tt>deprecated</tt>, <tt>transparent_union</tt>,
- <tt>unused</tt>, <tt>weak</tt><br>
+ <tt>unused</tt>, <tt>used</tt>, <tt>weak</tt><br>
<b>Unsupported:</b> <tt>aligned</tt>, <tt>mode</tt>, <tt>packed</tt>,
<tt>section</tt>, <tt>shared</tt>, <tt>tls_model</tt>,
<li>The C++ front-end inherits all problems afflicting the <a href="#c-fe">C
front-end</a>.</li>
-<li><b>IA-64 specific</b>: The C++ front-end does not use <a
-href="http://llvm.cs.uiuc.edu/PR406">IA64 ABI compliant layout of v-tables</a>.
-In particular, it just stores function pointers instead of function
-descriptors in the vtable. This bug prevents mixing C++ code compiled with
-LLVM with C++ objects compiled by other C++ compilers.</li>
-
</ul>
</div>
<!-- ======================================================================= -->
<div class="doc_subsection">
- <a name="x86-be">Known problems with the X86 back-end</a>
+ <a name="c-be">Known problems with the C back-end</a>
</div>
<div class="doc_text">
<ul>
- <li>None yet</li>
+
+<li>The C back-end produces code that violates the ANSI C Type-Based Alias
+Analysis rules. As such, special options may be necessary to compile the code
+(for example, GCC requires the <tt>-fno-strict-aliasing</tt> option). This
+problem probably cannot be fixed.</li>
+
+<li><a href="http://llvm.org/PR56">Zero arg vararg functions are not
+supported</a>. This should not affect LLVM produced by the C or C++
+frontends.</li>
+
</ul>
</div>
<!-- ======================================================================= -->
<div class="doc_subsection">
- <a name="sparcv9-be">Known problems with the SparcV9 back-end</a>
+ <a name="x86-be">Known problems with the X86 back-end</a>
</div>
<div class="doc_text">
<ul>
-<li><a href="http://llvm.cs.uiuc.edu/PR60">[sparcv9] SparcV9 backend miscompiles
-several programs in the LLVM test suite</a></li>
+<li>None yet</li>
</ul>
</div>
<!-- ======================================================================= -->
<div class="doc_subsection">
- <a name="c-be">Known problems with the C back-end</a>
+ <a name="sparcv9-be">Known problems with the SparcV9 back-end</a>
</div>
<div class="doc_text">
<ul>
-
-<li>The C back-end produces code that violates the ANSI C Type-Based Alias
-Analysis rules. As such, special options may be necessary to compile the code
-(for example, GCC requires the <tt>-fno-strict-aliasing</tt> option). This
-problem probably cannot be fixed.</li>
-
-<li><a href="http://llvm.cs.uiuc.edu/PR56">Zero arg vararg functions are not
-supported</a>. This should not affect LLVM produced by the C or C++
-frontends.</li>
-
+<li><a href="http://llvm.org/PR60">[sparcv9] SparcV9 backend miscompiles
+several programs in the LLVM test suite</a></li>
</ul>
</div>
<ul>
-<li>On 21164s, some rare FP arithmatic sequences which may trap do not have the appropriate nops inserted to ensure restartability.</li>
-
-<li>Vararg functions are not supported.</li>
-
-<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>
+<li>On 21164s, some rare FP arithmetic sequences which may trap do not have the
+appropriate nops inserted to ensure restartability.</li>
</ul>
speaking this is not a bug in the IA64 back-end; it will also be encountered
when building C++ programs using the C back-end.)</li>
-<li>There are a few ABI violations which will lead to problems
-when mixing LLVM output with code built with other compilers,
-particularly for C++ and floating-point programs.</li>
+<li>The C++ front-end does not use <a href="http://llvm.org/PR406">IA64
+ABI compliant layout of v-tables</a>. In particular, it just stores function
+pointers instead of function descriptors in the vtable. This bug prevents
+mixing C++ code compiled with LLVM with C++ objects compiled by other C++
+compilers.</li>
-<li>Vararg functions are not supported.</li>
+<li>There are a few ABI violations which will lead to problems when mixing LLVM
+output with code built with other compilers, particularly for floating-point
+programs.</li>
+
+<li>Defining vararg functions is not supported (but calling them is ok).</li>
</ul>
<!-- ======================================================================= -->
<div class="doc_subsection">
- <a name="sparcv8">Known problems with the SPARC-V8 back-end</a>
+ <a name="sparc">Known problems with the SPARC back-end</a>
</div>
<div class="doc_text">
<ul>
-<li>Many features are still missing (e.g. support for 64-bit integer
-arithmetic).</li>
-
-<li>This backend needs to be updated to use the SelectionDAG instruction
-selection framework.</li>
+<li>None yet.</li>
</ul>
-
</div>
<!-- *********************************************************************** -->
<div class="doc_text">
-<p>A wide variety of additional information is available on the LLVM web page,
-including <a href="http://llvm.cs.uiuc.edu/docs/#maillist">mailing lists</a> and
-<a href="http://llvm.cs.uiuc.edu/pubs/">publications describing algorithms and
+<p>A wide variety of additional information is available on the <a
+href="http://llvm.org">LLVM web page</a>, including <a
+href="http://llvm.org/docs/">documentation</a> and <a
+href="http://llvm.org/pubs/">publications describing algorithms and
components implemented in LLVM</a>. The web page also contains versions of the
API documentation which is up-to-date with the CVS version of the source code.
You can access versions of these documents specific to this release by going
into the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p>
<p>If you have any questions or comments about LLVM, please feel free to contact
-us via the <a href="http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev">mailing
+us via the <a href="http://llvm.org/docs/#maillist"> mailing
lists</a>.</p>
</div>
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- <a href="http://llvm.cs.uiuc.edu">The LLVM Compiler Infrastructure</a><br>
+ <a href="http://llvm.org/">The LLVM Compiler Infrastructure</a><br>
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