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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<link rel="stylesheet" href="llvm.css" type="text/css">
<title>LLVM 1.4 Release Notes</title>
</head>
<body>
<div class="doc_title">LLVM 1.4 Release Notes</div>
<ol>
<li><a href="#intro">Introduction</a></li>
<li><a href="#whatsnew">What's New?</a></li>
<li><a href="GettingStarted.html">Installation Instructions</a></li>
<li><a href="#portability">Portability and Supported Platforms</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="#sparcv9-be">Known problems with the SparcV9 Back-end</a>
<li><a href="#ppc-be">Known problems with the PowerPC 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_author">
<p>Written by the <a href="http://llvm.cs.uiuc.edu">LLVM team</a><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 1.4. Here we describe the status of LLVM, including any
known problems and 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/1.4/">LLVM 1.4 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
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 fifth public release of the LLVM compiler infrastructure.</p>
<p> At this time, LLVM is known to correctly compile on a broad range of
C and C++ programs, including the SPEC CPU95 & 2000 suite. This release
includes several major enhancements to the LLVM system, including a new
PowerPC JIT, enhancements to the C/C++ front-end to provide source line number
information in LLVM, a new <a href="CommandGuide/html/llvmc.html">compiler
driver</a>, and several other enhancements listed below. It also includes
bug fixes for those problems found since the 1.3 release.</p>
<p>Note that this release seperates the LLVM Program Testsuite out of the
main LLVM distribution into a seperate CVS repository and tarball. This
reduces the size of the main LLVM distribution. Also note that LLVM now
builds tools into llvm/Debug/bin by default instead of llvm/tools/Debug.</p>
</div>
<!--=========================================================================-->
<div class="doc_subsubsection">
<a name="newfeatures">This release implements the following new features:</a>
</div>
<div class="doc_text">
<ol>
<li>LLVM now includes a Just-In-Time compiler for the PowerPC target.</li>
<li>llvmgcc and llvmg++ now emit source line number information when '-g' is
passed in, making it possible to map from LLVM code back to source.
This information is currently used by llvm-db and can be used with other
tools and passes.</li>
<li>The test/Programs hierarchy <a href="http://llvm.cs.uiuc.edu/PR257">has
been moved out of the main LLVM tree</a> into a separate CVS repository and
tarball. This shrinks the distribution size of LLVM itself significantly.
</li>
<li>LLVM now optimizes global variables more aggressively than it did
before.</li>
<li>LLVM now includes the new '<tt>undef</tt>' value and
<a href="LangRef.html#i_unreachable"><tt>unreachable</tt></a> instruction,
which give the optimizer more information about the behavior of the
program.
</li>
<li>Bytecode compression with bzip2 has been implemented. All bytecode files
generated by LLVM will now be compressed by default. Compression can be
disabled with the <tt>-disable-compression</tt> option to the tools that can
generate bytecode files.
</li>
<li>A generic <a href="CommandGuide/html/llvmc.html">compiler driver</a>
(llvmc) and
an associated <a href="CommandGuide/html/llvm-ld.html">generic linker</a>
(llvm-ld) have been added. The compiler driver is generic because it can be
configured
to pre-process, translate, optimize, assemble, and link code from any source
language with an LLVM front-end. This makes it easier for compiler writers
to hide the multiple steps required to compile a program (compiling,
optimizing, linking runtime libraries, etc) in one simple command.
</li>
<li>The <a href="http://llvm.cs.uiuc.edu/PR263">dependent libraries</a>
feature has been implemented. This allows front end compilers to indicate in
the bytecode which libraries the bytecode needs to be linked with. Both the
C/C++ and Stacker front ends support generating the required dependencies.
The linker now supports using this information to ensure required libaries are
linked into the module. This minimizes the need to use the <tt>-l</tt> option
when using <a href="CommandGuide/html/llvmc.html"><tt>llvmc</tt></a>.
</li>
<li>The LLVM makefiles have been improved to build LLVM much faster and
includes new targets (like dist-check, uninstall). One important user-visible
change is that libraries and tools will now be built into
<tt>$builddir/Debug/{bin,lib}</tt>
instead of <tt>$builddir/tools/Debug</tt> and <tt>$builddir/lib/Debug</tt>
(Similarly for <tt>Release</tt> and <tt>Profile</tt> builds).
</li>
<li>The LLVM source code is much more compatible with Microsoft Visual C++,
including the JIT and runtime-code generation, though the entire system
may not work with it.
</li>
<li>The JIT-Target interfaces <a href="http://llvm.cs.uiuc.edu/PR283">are
now much simpler</a> and more powerful.
</li>
<li>LLVM now provides llvm-ar and llvm-ranlib tools for working with archives
of LLVM bytecode files.</li>
<li>zlib and libpng are <a href="http://llvm.cs.uiuc.edu/PR417">no longer
included in the main LLVM tarball</a>.</li>
<li>The LLVM code generator now automatically generates assembly code writers
from an abstract target descriptions, eliminating the need to write
assembly printers manually.</li>
<li>LLVM regression and feature tests now use DejaGNU instead of QMTest.</li>
</ol>
</div>
<!--=========================================================================-->
<div class="doc_subsubsection">
In this release, the following missing features were implemented:
</div>
<div class="doc_text">
<ol>
<li><a href="http://llvm.cs.uiuc.edu/PR419">JIT interface should support
arbitrary calls</a>
</li>
<li>The <tt>llvm-ar</tt> tool was previously incomplete and didn't properly
support other ar(1) implementations. This has been corrected. <tt>llvm-ar</tt>
now fully supports all archive editing functions, table of contents listing,
extraction, and printing. It can also read BSD4.4/MacOSX and SVR4 style
archives. See <a href="CommandGuide/html/llvm-ar.html">llvm-ar</a> for
details.
</li>
</ol>
</div>
<!--=========================================================================-->
<div class="doc_subsubsection">
<a name="qualityofimp">In this release, the following Quality of Implementation
issues were fixed:</a>
</div>
<div class="doc_text">
<ol>
<li>The linker no longer <a href="http://llvm.cs.uiuc.edu/PR426">emits many
useless warnings</a> when linking C++ programs.
</li>
<li>The LLVM <a href="http://llvm.cs.uiuc.edu/PR352">#include namespace</a>
has been made consistent. Files in <tt>llvm/include/{Support,Config}</tt>
are now located in <tt>llvm/include/llvm/{Support,Config}</tt>.
</li>
<li>The names of the libraries generated by compiling LLVM source have been
changed to ensure they do not conflict with other packages upon installation.
Each LLVM library is now prefixed with LLVM and uses mixed clase. For example,
the library <tt>libasmparser.a</tt> in 1.3 has become
<tt>libLLVMAsmParser.a</tt> in release 1.4.
</li>
<li>The C++ frontend no longer expands and emits <a
href="http://llvm.cs.uiuc.edu/PR459">all inline functions, even if they
are unused</a>. It now properly tracks which functions are needed and
only compiles those.</li>
<li>Many improvements in the <a href="http://llvm.cs.uiuc.edu/PR256">autoconf
and makefile systems</a> have been implemented.</li>
</ol>
|
