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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 1.2 Release Notes</title>
</head>
<body>
<div class="doc_title">
LLVM 1.2 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="#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 1.2. 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/1.2/">LLVM 1.2 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 third public release of the LLVM compiler infrastructure. This
release incorporates several <a href="#newfeatures">new features</a> (including
exception handling support for the native code generators, the start of a
source-level debugger, and profile guided optimizer components), many <a
href="#qualityofimp">speedups</a> and <a href="#codequality">code quality</a>
improvements, documentation improvements, and a small collection of important <a
href="bugfix">bug fixes</a>. Overall, this is our highest quality release to
date, and we encourage you to upgrade if you are using LLVM 1.0 or 1.1.
</p>
<p><B> FIXME: UPDATE: </b>
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><a href="SourceLevelDebugging.html">A new LLVM source-level debugger has been started.</a></li>
<li>LLVM 1.2 encodes bytecode files for large programs in 10-30% less space.</li>
<li>LLVM can now feed profile information back into optimizers for Profile Guided Optimization, and includes a simple basic block reordering pass.</li>
<li>The LLVM JIT lazily initializes global variables, reducing startup time for programs with lots of globals (like C++ programs).</li>
<li>The build and installation infrastructure in this release is dramatically
improved. There is now an <a
href="http://llvm.cs.uiuc.edu/PR105"><tt>autoconf/AutoRegen.sh</tt> script</a>
that you can run to rebuild the <tt>configure</tt> script and its associated
files as well as beta support for "<a
href="http://llvm.cs.uiuc.edu/PR208">make</a> <a
href="http://llvm.cs.uiuc.edu/PR220">install</a>" and <a
href="http://llvm.cs.uiuc.edu/PR203">RPM package generation</a>.</li>
<li>The "tblgen" tool is <a href="TableGenFundamentals.html">now documented</a>.</li>
<li>The LLVM code generator got a multitude of improvements:
<ul>
<li>It can now fold spill code into instructions on targets that support it.</li>
<li>A generic machine code spiller/rewriter was added. It provides an API for
global register allocators to eliminate virtual registers and add the
appropriate spill code.</li>
<li>The represenation of machine basic blocks got cleaned up and improved to
allow easier development and more efficient implementation.</li>
</ul>
</li>
<li><a href="http://llvm.cs.uiuc.edu/PR253">LLVM now no longer depends on the boost library</a>.</li>
<li>The X86 backend now generates <b>substantially</b> better native code, and is faster.</li>
<li>The C backend has been turned moved from the "llvm-dis" tool to the "llc"
tool. You can activate it with "<tt>llc -march=c foo.bc -o foo.c</tt>".</li>
<li>LLVM includes a new interprocedural optimization that marks global variables
"constant" when they are provably never written to.</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/PR16">Exception handling support in the X86
& Sparc native code generators</a></li>
<li>The C/C++ front-end now support the GCC <tt>__builtin_return_address</tt> and <tt>__builtin_frame_address</tt> extensions.</li>
<li><a href="http://llvm.cs.uiuc.edu/PR249">[X86] Missing cast from ULong -> Double, cast FP -> bool and support for -9223372036854775808</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/PR135">JIT should lazily initialize global variables</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR192">[X86] X86 Backend never releases memory for machine code structures</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR196">[vmcore] OpaqueType objects memory leak</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR182">[llvmgcc] C front-end does not compile "extern inline" into linkonce</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR73">Bytecode format inconsistent</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR209">[loadvn/inline/scalarrepl] Slow optimizations with extremely large basic blocks</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR224">[asmparser] Really slow parsing of types with complex upreferences</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR205">[llvmgcc] C front-end does not emit 'zeroinitializer' when possible</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR233">[llvmgcc] Structure copies result in a LOT of code</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR239">LLVM is now much more memory efficient when handling large zero initialized arrays</a></li>
</ol>
<!--=========================================================================-->
<div class="doc_subsubsection">
In this release, the following build problems were fixed:
</div>
<ol>
<li><a href="http://llvm.cs.uiuc.edu/PR210">[build] Makefiles break if C frontend target string has unexpected value</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR214">[build] hard-wired assumption that shared-library extension is ".so"</a></li>
<li><A href="http://llvm.cs.uiuc.edu/PR222">make tools-only doesn't make lib/Support</a></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/PR187">[loopsimplify] Many pointless phi nodes are created</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR237">[x86] wierd stack/frame pointer manipulation</a></li>
<li>The X86 backend now generate <tt>fchs</tt> to negate floating point numbers,
compiles memcpy() into the <tt>rep movs</tt> instruction, and makes much better
use of powerful addressing modes and instructions.</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=&
|
