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Substantially hack on and clean up the release notes

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15416 91177308-0d34-0410-b5e6-96231b3b80d8
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Chris Lattner 2004-08-02 20:28:44 +00:00
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@ -71,15 +71,14 @@ href="http://llvm.cs.uiuc.edu/releases/">releases page</a>.</p>
<p>This is the fourth public release of the LLVM compiler infrastructure. This
release primarily improves the <a href="#codequality">performance of the
code</a> produced by all aspects of the LLVM compiler and adds many <a
href="#newfeatures">new features</a>, and <a href="#bugfix">fixes a few
bugs</a> as well.</p>
code</a> produced by all aspects of the LLVM compiler, adds many <a
href="#newfeatures">new features</a>, <a href="#bugfix">fixes a few
bugs</a>, and speeds up the compiler.</p>
<p> At this time, LLVM is known to correctly compile and run all C &amp; 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>
SPEC CPU95 &amp; 2000 benchmarks, the Olden benchmarks, and the Ptrdist
benchmarks, and <b>many</b> other programs. LLVM now also works
with a broad variety of C++ programs.</p>
</div>
@ -97,8 +96,8 @@ generators, and the interpreter.</li>
<li>Bugpoint can now narrow down code-generation bugs to a loop nest, where
before it could only narrow them down to a function being miscompiled.</li>
<li><a href="http://llvm.cs.uiuc.edu/PR40">Bugpoint can now debug arbitrary
modes of llc</a> and lli, by passing them command line flags (e.g.,
<tt>-regalloc=linearscan</tt>, <tt>-enable-correct-eh-support</tt>, etc.) </li>
modes of llc</a> and lli, by passing them command line flags (e.g.
<tt>-regalloc=linearscan</tt>).</li>
<li>The Control Flow Graph in the native code generators is no longer
constrained to be the same as the CFG for the LLVM input code.</li>
<li>The LLVM induction variable analysis routines have been rewritten.</li>
@ -108,8 +107,9 @@ replacement and exit value replacement optimizations.</li>
<li>LLVM now has first-class support for <a
href="GarbageCollection.html">Accurate Garbage Collection</a>, enabling the use
of aggressive copying and generational collectors.</li>
<li>LLVM now includes an implementation of Andersen's interprocedural alias
analysis algorithm.</li>
<li>LLVM now includes a simple implementation of <a
href="AliasAnalysis.html#anders-aa">Andersen's interprocedural alias
analysis</a> algorithm.</li>
<li>Bugpoint can <a href="http://llvm.cs.uiuc.edu/PR327">extract individual
basic blocks</a> to track down reduce miscompilation testcases.</li>
<li>LLVM and the C front-end now work under Win32 using the
@ -117,29 +117,35 @@ basic blocks</a> to track down reduce miscompilation testcases.</li>
This includes the JIT compiler.</li>
<li>The LLVM code generator is now being <a
href="CodeGenerator.html">documented</a>.</li>
<li>There is a new tool, llvm-bcanalyzer. This tool can compute basic
statistics and bytecode density statistics on a module or function basis and
also dump out bytecode in a textual format that is lower level than assembly
(values are not resolved from slot numbers). It should only be of interest to
(a) those who are working to improve the bytecode format and (b) those who
really want to understand or document the details of the bytecode format.</li>
<li>The <a href="BytecodeFormat.html">LLVM Bytecode file format</a> is now
<li>LLVM includes a new tool, <a
href="CommandGuide/html/llvm-bcanalyzer.html">llvm-bcanalyzer</a>, This tool
can compute various statistics and dump information about LLVM bytecode
encoding.</li>
<li>The <a href="BytecodeFormat.html">LLVM bytecode file format</a> is now
documented.</li>
<li>LLVM now provides an <a
href="LangRef.html#i_isunordered">llvm.isunordered</a> intrinsic for efficient
implementation of unordered floating point comparisons.</li>
<li>The llvmgcc front-end now supports the GCC builtins for ISO C99 floating
point comparison macros (e.g., <tt>__builtin_islessequal</tt>).</li>
<li>Now that there are more source files than can fit on a 32Kbyte command
line (Linux's limit), there's a new utility for searching the sources. The
llvmgrep tool in the utils directory combines an egrep and a find without
passing filenames through the command line. This improves performance
slightly. Simply run llvmgrep like you might egrep but leave off the file
names.</li>
<li>We now generate HTML documentation and man pages for the tools from a single
source (perl-style POD files).</li>
<li>We now generate <a href="CommandGuide/">HTML documentation and man pages</a>
for the tools from a single source (perl-style POD files).</li>
<li>The LLVM code generator can now dynamically load targets from shared
objects.</li>
<li>LLVM now includes a "skeleton" target, which makes it easier to get
started porting LLVM to new architectures.</li>
<li>The linear scan register allocator is now enabled by default in the
target-independent code generator.</li>
<li>LLVM now includes a dead store elimination pass.</li>
<li>Bugpoint can now debug miscompilations that lead to the program going
into an infinite loop.</li>
<li>LLVM now provides interfaces to support ML-style pattern matching on the
LLVM IR.</li>
<li>LLVM now includes a <a
href="AliasAnalysis.html#globalsmodref">context-sensitive mod/ref analysis</a>
for global variables, which is now enabled by default in gccld.</li>
<li>LLVM can now autogenerate assembly printers for code generators from the
tablegen description of the target (before they were hand coded).</li>
</ol>
</div>
@ -161,6 +167,10 @@ non-instruction entities, such as global constant initializer</a></li>
with 64-bit pointers.</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR290">Bugpoint doesn't support
uses of external fns by immediate constant exprs</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR407">Can't add function passes that
depend on immutable passes to the FunctionPassManager</a>.</li>
<li><a href="http://llvm.cs.uiuc.edu/PR308">Archive file reader doesn't
understand abbreviated names in headers</a></li>
</ol>
</div>
@ -189,6 +199,10 @@ Bytecode Reader</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR402">Bytecode Enhancements
Needed</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR404">[loopsimplify] Loop simplify is really slow on 252.eon</a></li>
<li><a href="Http://llvm.cs.uiuc.edu/PR122">[code-cleanup] SymbolTable
class cleanup, Type should not derive from Value, eliminate
ConstantPointerRef class</a>.</li>
<li>The memory footprint of the LLVM IR has been reduced substantially.</li>
</ol>
</div>
@ -231,7 +245,7 @@ hits the inlining threshold.</li>
<li>The -inline pass no longer misses obvious inlining opportunities just
because the callee eventually calls into an external function.</li>
<li>The -simplifycfg pass can now "if convert" simple statements into the new
<li>The -simplifycfg pass can now "if convert" simple statements into the
<tt>select</tt> instruction.</li>
<li>The -loopsimplify pass can now break <a
@ -245,6 +259,9 @@ memory.</li>
<li>The link-time optimizer now runs the -prune-eh pass (to remove unused
exception handlers).</li>
<li>The link-time optimizer now runs dead store elimination and uses a simple
interprocedural alias analysis.</li>
<li>The -simplifycfg pass can now eliminate simple correlated branches (such as
"<tt>if (A &lt; B &amp;&amp; A &lt; B)</tt>", and can turn short-circuiting
operators into the strict versions when useful (such as "<tt>if (A &lt; B || A
@ -254,16 +271,14 @@ operators into the strict versions when useful (such as "<tt>if (A &lt; B || A
propagation of function calls. It currently supports a few math library
functions like sqrt/sin/cos/etc.</li>
<li>The C backend now emits <a href="http://llvm.cs.uiuc.edu/PR334">Syntactic
<li>The C backend now emits <a href="http://llvm.cs.uiuc.edu/PR334">syntactic
loops</a> in the code to help C compilers whose optimizers do not recognize
loops formed from gotos (like GCC).</li>
<li>Fixed: <a href="http://llvm.cs.uiuc.edu/PR368">[sparcv9] null
often spilled to constant pool</a>.</li>
<li>The SparcV9 backend no longers <a
href="http://llvm.cs.uiuc.edu/PR368">spills the null constant to the constant
pool</a>.</li>
</ol>
<li>Fixed: <a href="Http://llvm.cs.uiuc.edu/PR122">[code-cleanup] SymbolTable
class cleanup, Type should not derive from Value, eliminate
ConstantPointerRef class</a>. All three changes have been made.
</div>
<!--=========================================================================-->
@ -274,7 +289,7 @@ were fixed:</a>
<div class="doc_text">
<p>Bugs in the LLVM Core:</p>
<p>Bugs fixed in the LLVM Core:</p>
<ol>
<li><a href="http://llvm.cs.uiuc.edu/PR306">[loopsimplify] Loop simplify
@ -283,8 +298,6 @@ incorrectly updates dominator information</a></li>
breaks SSA form</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR313">[X86] JIT miscompiles unsigned short
to floating point cast</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR315">[jit] abort, don't warn, when
missing external functions encountered</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR330">[vmcore] Linker causes erroneous
asssertion</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR332">[adce] Crash handling unreachable
@ -293,13 +306,8 @@ code that unwinds</a></li>
of the same name, both having constant pools</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR337">[livevar] Live variables missed
physical register use of aliased definition</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR340">Verifier misses malformed switch
instruction</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR365">[asmwriter] Asm writer aborts if
an instruction is not embedded into a function</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR369">[X86] stackifier crash on floating
point setcc X, X</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR407">Can't add LICM to FunctionPassManager</a></li>
</ol>
<p>Bugs in the C/C++ front-end:</p>
@ -354,22 +362,6 @@ are needed by the LLVM build process or test suite (e.g., /bin/time).</p>
</div>
<!--=========================================================================-->
<div class="doc_subsection">
In this release, the following portability problems were fixed:
</div>
<div class="doc_text">
<ol>
<li><a href="http://llvm.cs.uiuc.edu/PR304">warnings compiling Stacker compiler
on Mac OS X</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR308">Archive file reader doesn't
understand abbreviated names in headers</a></li>
</ol>
</div>
<!-- *********************************************************************** -->
<div class="doc_section">
<a name="knownproblems">Known Problems</a>
@ -635,14 +627,15 @@ Please report any bugs or problems.</p>
<ul>
<li>The C++ front-end inherits all problems afflicting the <a href="#c-fe">C
front-end</a>.</li>
</ul>
<p><b>IA64 note</b>: The C++ front-end does not use <a
href="http://llvm.cs.uiuc.edu/PR406">IA64 ABI compliant layout of vtables</a>.
<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.</p>
</ul>
</div>
<!-- _______________________________________________________________________ -->
@ -688,13 +681,7 @@ href="http://gcc.gnu.org/gcc-3.4/changes.html">GCC 3.4 release notes</a>.</li>
<div class="doc_text">
<ul>
<li>Optimized (Release) versions of LLVM built with GCC 3.3.2 or 3.3.3 will
produce an llc tool that always enters an infinite loop due to what
appears to be an optimization bug (-O2 and -O3) in those versions of GCC.
This problem does not happen in GCC 3.3.1 nor GCC 3.4.0 nor does it happen if
you build a Debug version of LLVM. You are cautioned not to use GCC 3.3.2 or
GCC 3.3.3 to build Optimized versions of LLVM. It is unclear whether this problem
affects other backends but it is unlikely.</li>
<li>none yet</li>
</ul>
</div>