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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<link rel="stylesheet" href="llvm.css" type="text/css">
<title>LLVM 1.3 Release Notes</title>
</head>
<body>
<div class="doc_title">LLVM 1.3 Release Notes</div>
<ol>
<li><a href="#intro">Introduction</a></li>
<li><a href="#whatsnew">What's New?</a></li>
<li><a href="#portability">Portability and Supported Platforms</a></li>
<li><a href="#install-instructions">Installation Instructions</a></li>
<li><a href="#knownproblems">Known Problems</a>
<ul>
<li><a href="#experimental">Experimental features included in this
release</a>
<li><a href="#core">Known problems with the LLVM Core</a>
<li><a href="#c-fe">Known problems with the C Front-end</a>
<li><a href="#c++-fe">Known problems with the C++ Front-end</a>
<li><a href="#x86-be">Known problems with the X86 Back-end</a>
<li><a href="#sparc-be">Known problems with the Sparc Back-end</a>
<li><a href="#c-be">Known problems with the C back-end</a>
</ul></li>
<li><a href="#additionalinfo">Additional Information</a></li>
</ol>
<div class="doc_text">
<p><b>Written by the <a href="http://llvm.cs.uiuc.edu">LLVM team</a></b><p>
</div>
<!-- *********************************************************************** -->
<div class="doc_section">
<a name="intro">Introduction</a>
</div>
<!-- *********************************************************************** -->
<div class="doc_text">
<p>This document contains the release notes for the LLVM compiler
infrastructure, release 1.3. Here we describe the status of LLVM, including any
known problems and bug fixes 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/1.3/">LLVM 1.3 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 potentially more
current releases, please check out the <a href="http://llvm.cs.uiuc.edu">main
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, 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>
</div>
<!-- *********************************************************************** -->
<div class="doc_section">
<a name="whatsnew">What's New?</a>
</div>
<!-- *********************************************************************** -->
<div class="doc_text">
<p>
This is the fourth public release of the LLVM compiler infrastructure.
</p>
<p>
At this time, LLVM is known to correctly compile and run all C & C++ SPEC
CPU2000 benchmarks, the Olden benchmarks, and the Ptrdist benchmarks. It has
also been used to compile <b>many</b> other programs. LLVM now also works with
a broad variety of C++ programs, though it has still received less testing than
the C front-end.
</p>
<!--=========================================================================-->
<div class="doc_subsubsection">
<a name="newfeatures">This release implements the following new features:</a>
</div>
<ol>
<li>The LLVM <a href="LangRef.html#i_select"><tt>select</tt></a> instruction is
now fully implemented and supported by all targets.</li>
</ol>
<!--=========================================================================-->
<div class="doc_subsubsection">
In this release, the following missing features were implemented:
</div>
<ol>
<li><a href="http://llvm.cs.uiuc.edu/PR82">LLVM cannot handle structures with more than 256 elements</a></li>
</ol>
<!--=========================================================================-->
<div class="doc_subsubsection">
<a name="qualityofimp">In this release, the following Quality of Implementation issues were fixed:</a>
</div>
<ol>
<li><a href="http://llvm.cs.uiuc.edu/PR305">LLVM tools will happily spew bytecode onto your terminal</a></li>
</ol>
<!--=========================================================================-->
<div class="doc_subsubsection">
In this release, the following build problems were fixed:
</div>
<ol>
<li></li>
</ol>
<!--=========================================================================-->
<div class="doc_subsubsection">
<a name="codequality">In this release, the following Code Quality issues were fixed:</a>
</div>
<ol>
<li><a href="http://llvm.cs.uiuc.edu/PR309">[vmcore] Code quality problem due to long operand of getelementptr</a></li>
</ol>
<!--=========================================================================-->
<div class="doc_subsubsection">
<a name="bugfix">In this release, the following bugs in the previous release were fixed:</a>
</div>
<p>Bugs in the LLVM Core:</p>
<ol>
<li><a href="http://llvm.cs.uiuc.edu/PR306">[loopsimplify] Loop simplify incorrectly updates dominator information</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR310">[tailduplicate] DemoteRegToStack breaks SSA form</a></li>
</ol>
<p>Bugs in the C/C++ front-end:</p>
<ol>
<li></li>
</ol>
</div>
<!-- *********************************************************************** -->
<div class="doc_section">
<a name="portability">Portability and Supported Platforms</a>
</div>
<!-- *********************************************************************** -->
<div class="doc_text">
<p>LLVM has been extensively tested on Intel and AMD machines running Red
Hat Linux and FreeBSD. It has also been tested on Sun UltraSPARC workstations running Solaris 8.
Additionally,
LLVM works on Mac OS X 10.3 and above, but only with the C backend or
interpreter (no native backend for the PowerPC is available yet).
The core LLVM infrastructure uses "autoconf" for portability, so hopefully we
work on more platforms than that. However, it is likely that we
missed something and that minor porting is required to get LLVM to work on
new platforms. We welcome portability patches and error messages.</p>
</div>
<!-- *********************************************************************** -->
<div class="doc_section">
<a name="knownproblems">Known Problems</a>
</div>
<!-- *********************************************************************** -->
<div class="doc_text">
<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
there isn't already one.</p>
</div>
<!-- ======================================================================= -->
<div class="doc_subsection">
<a name="experimental">Experimental features included with this release</a>
</div>
<div class="doc_text">
<p>
The following components of this LLVM release are either untested, known to be
broken or unreliable, or are in early development. These components should not
be relied on, and bugs should not be filed against them, but they may be useful
to some people. In particular, if you would like to work on one of these
components, please contact us on the llvmdev list.
</p>
<ul>
<li>The following passes are incomplete or buggy: <tt>-pgmdep, -memdep,
-ipmodref, -sortstructs, -swapstructs, -cee</tt></li>
<li>The <tt>-pre</tt> pass is incomplete (there are cases it doesn't handle that
it should) and not thoroughly tested.</li>
<li>The <tt>llvm-ar</tt> tool is incomplete and probably buggy.</li>
<li>The <tt>llvm-db</tt> tool is in a very early stage of development.</li>
</ul>
</div>
<!-- ======================================================================= -->
<div class="doc_subsection">
<a name="core">Known problems with the LLVM Core</a>
</div>
<div class="doc_text">
<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>It is not possible to <tt>dlopen</tt> an LLVM bytecode file in the JIT.</li>
<li>Linking in static archive files (.a files) is very slow (there is no symbol
table in the archive).</li>
<li>The gccld program <a href="http://llvm.cs.uiuc.edu/PR139">does not link objects/archives in the order specified on the command line.</a></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_subsection">
<a name="c-fe">Known problems with the C front-end</a>
</div>
<!-- _______________________________________________________________________ -->
<div class="doc_subsubsection">Bugs</div>
<div class="doc_text">
<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>
for (i = 0; i != 1000000; ++i) {
int X[n];
foo(X);
}
</pre></li>
<li>
Initialization of global union variables can only be done
<a href="http://llvm.cs.uiuc.edu/bugs/show_bug.cgi?id=162">with the largest
union member</a>.
</li>
<li><a href="http://llvm.cs.uiuc.edu/PR244">[llvm-gcc] Error when an implicitly external function is re-declared as static</a></li>
</ul>
</div>
<!-- _______________________________________________________________________ -->
<div class="doc_subsubsection">
Notes
</div>
<div class="doc_text">
<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>
<li>The following Unix system functionality has not been tested and may not
work:
<ol>
<li><tt>sigsetjmp</tt>, <tt>siglongjmp</tt> - These are not turned into the
appropriate <tt
|
