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@ -3,13 +3,11 @@
<html>
<head>
<link rel="stylesheet" href="llvm.css" type="text/css">
<title>LLVM 1.2 Release Notes</title>
<title>LLVM 1.3 Release Notes</title>
</head>
<body>
<div class="doc_title">
LLVM 1.2 Release Notes
</div>
<div class="doc_title">LLVM 1.3 Release Notes</div>
<ol>
<li><a href="#intro">Introduction</a></li>
@ -18,7 +16,8 @@
<li><a href="#install-instructions">Installation Instructions</a></li>
<li><a href="#knownproblems">Known Problems</a>
<ul>
<li><a href="#experimental">Experimental features included with this release</a>
<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>
@ -42,10 +41,10 @@
<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
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/1.2/">LLVM 1.2 web site</a>. If you are
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>
@ -71,14 +70,7 @@ href="http://llvm.cs.uiuc.edu/releases/">releases page</a>.</p>
<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.
This is the fourth public release of the LLVM compiler infrastructure.
</p>
<p>
@ -95,45 +87,8 @@ the C front-end.
</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, includes a simple basic block reordering pass, and supports edge profiling as well as function and block-level profiling.</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 target-independent code generator got several 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 code basic blocks is more efficient and has
an easier to use interface.</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>
<li>LLVM now includes a new interprocedural optimization that converts small "by reference" arguments to "by value" arguments, which often improves the performance of C++ programs substantially.</li>
<li>Bugpoint can now do a better job reducing miscompilation problems by
reducing programs down to a particular loop nest, instead of just the function
being miscompiled.</li>
<li>The GCSE and LICM passes can now operate on side-effect-free function calls, for example hoisting calls to "<tt>strlen</tt>" and folding "<tt>cos</tt>" common subexpressions.</li>
<li>LLVM has early support for a new <a
href="LangRef.html#i_select"><tt>select</tt></a> instruction, though it is
currently only supported by the C backend.</li>
<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>
@ -143,13 +98,7 @@ In this release, the following missing features were implemented:
</div>
<ol>
<li><a href="http://llvm.cs.uiuc.edu/PR16">Exception handling in the X86
&amp; Sparc native code generators</a> is now supported</li>
<li>The C/C++ front-end now supports the GCC <tt>__builtin_return_address</tt> and <tt>__builtin_frame_address</tt> extensions. These are also supported by the X86 backend and by the C backend.</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>
<li>The C/C++ front-end <a href="http://llvm.cs.uiuc.edu/PR273">now supports</a>
the "<a href="http://gcc.gnu.org/onlinedocs/gcc/Labels-as-Values.html#Labels%20as%20Values">labels as values</a>" GCC extension, often used to build "threaded interpreters".</a></li>
<li></li>
</ol>
@ -159,18 +108,7 @@ the "<a href="http://gcc.gnu.org/onlinedocs/gcc/Labels-as-Values.html#Labels%20a
</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>
<li><a href="http://llvm.cs.uiuc.edu/PR275">[llvmgcc] Local array initializers are expanded into large amounts of code</a></li>
<li></li>
</ol>
<!--=========================================================================-->
@ -179,9 +117,7 @@ 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>
<li></li>
</ol>
<!--=========================================================================-->
@ -190,12 +126,7 @@ In this release, the following build problems were fixed:
</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>
<li></li>
</ol>
@ -207,31 +138,7 @@ use of powerful addressing modes and instructions.</li>
<p>Bugs in the LLVM Core:</p>
<ol>
<li><a href="http://llvm.cs.uiuc.edu/PR179">[licm] LICM promotes volatile memory
locations to registers</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR191">[licm] Memory read after free causes
infrequent crash</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR194">[indvars] Induction variable
canonicalization always makes 32-bit indvars</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR193">[constantmerge] Merging globals can
cause use of invalid pointers!</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR212">[bcreader] Bytecode reader misreads 'long -9223372036854775808'!</a></li>
<li><a href="http://llvm.cs.uiuc.edu/bugs/show_bug.cgi?id=174">Tail duplication does not update SSA form correctly.</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR218">VMCore mishandles double -0.0</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR219">[X86] X86 backend code generates -0.0 as +0.0</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR223">[loopsimplify] Loopsimplify incorrectly updates dominator information</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR225">[pruneeh] -pruneeh pass removes invoke instructions it shouldn't</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR228">[sparc] Boolean constants are emitted as true and false</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR234">[interpreter] va_list values silently corrupted by function calls</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR235">Tablegen aborts on errors</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR236">[inliner] Error inlining intrinsic calls into invoke instructions</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR245">Linking weak and strong global variables is dependent on link order</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR258">Variables used to define non-printable FP constants are externally visible</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR259">CBE gives linkonce functions wrong linkage semantics</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR274">[JIT] Programs cannot resolve the fstat function</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR284">[indvars] Induction variable analysis violates LLVM invariants</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR296">[execution engines] Unhandled cast constant expression</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR299">[Sparc] Code generator asserts on alloca of zero size type</a></li>
<li></li>
</ol>
@ -239,17 +146,7 @@ cause use of invalid pointers!</a></li>
<p>Bugs in the C/C++ front-end:</p>
<ol>
<li><a href="http://llvm.cs.uiuc.edu/PR186">Need weak linkage on memory
management functions in libc runtime to allow them to be overriden</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR202">[llvm-gcc] asserts when an extern inline function is redefined</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR204">[llvmg++] Dynamically initialized constants cannot be marked 'constant'</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR216">[llvmgcc] floating-point unary minus is incorrect for +0.0</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR221">[llvm-gcc] miscompilation of 'X = Y = Z' with aggregate values</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR272">[llvmgcc] Invalid code created for complex division operation</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR268">[llvmgcc] Incorrect code generation for pointer subtraction</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR261">[llvmg++] Crash assigning pointers-to-members with casted types</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR291">[llvm-g++] Cleanups and gotos don't mix properly</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR297">[llvmgcc] Crash on auto register variable with specific register specified</a></li>
<li></li>
</ol>
</div>