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Scrub all LLVM 1.3 stuff, changing over to 1.4. Add info about PR419,

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which is now fixed.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15800 91177308-0d34-0410-b5e6-96231b3b80d8
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Chris Lattner 2004-08-16 00:20:18 +00:00
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@ -3,11 +3,11 @@
<html> <html>
<head> <head>
<link rel="stylesheet" href="llvm.css" type="text/css"> <link rel="stylesheet" href="llvm.css" type="text/css">
<title>LLVM 1.3 Release Notes</title> <title>LLVM 1.4 Release Notes</title>
</head> </head>
<body> <body>
<div class="doc_title">LLVM 1.3 Release Notes</div> <div class="doc_title">LLVM 1.4 Release Notes</div>
<ol> <ol>
<li><a href="#intro">Introduction</a></li> <li><a href="#intro">Introduction</a></li>
@ -41,10 +41,10 @@
<div class="doc_text"> <div class="doc_text">
<p>This document contains the release notes for the LLVM compiler <p>This document contains the release notes for the LLVM compiler
infrastructure, release 1.3. Here we describe the status of LLVM, including any infrastructure, release 1.4. Here we describe the status of LLVM, including any
known problems and bug fixes from the previous release. The most up-to-date known problems and bug fixes from the previous release. The most up-to-date
version of this document can be found on the <a 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 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 not reading this on the LLVM web pages, you should probably go there because
this document may be updated after the release.</p> this document may be updated after the release.</p>
@ -69,12 +69,7 @@ href="http://llvm.cs.uiuc.edu/releases/">releases page</a>.</p>
<div class="doc_text"> <div class="doc_text">
<p>This is the fourth public release of the LLVM compiler infrastructure. This <p>This is the fifth public release of the LLVM compiler infrastructure.</p>
release primarily improves the <a href="#codequality">performance of the
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>, speeds up the compiler, and introduces a new (experimental)
PowerPC code generator.</p>
<p> At this time, LLVM is known to correctly compile and run all C &amp; C++ <p> At this time, LLVM is known to correctly compile and run all C &amp; C++
SPEC CPU95 &amp; 2000 benchmarks, the Olden benchmarks, and the Ptrdist SPEC CPU95 &amp; 2000 benchmarks, the Olden benchmarks, and the Ptrdist
@ -91,67 +86,7 @@ with a broad variety of C++ programs.</p>
<div class="doc_text"> <div class="doc_text">
<ol> <ol>
<li>The LLVM <a href="LangRef.html#i_select"><tt>select</tt></a> instruction is <li></li>
now fully implemented and supported by all transformations, native code
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>).</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>
<li>LLVM now has new loop unrolling and loop unswitching passes.</li>
<li>The induction variable substitution pass performs linear function test
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 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
<a href="http://www.cygwin.com">Cygwin</a> runtime libraries.
This includes the JIT compiler.</li>
<li>The LLVM code generator is now being <a
href="CodeGenerator.html">documented</a>.</li>
<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>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>
<li>All LLVM tools will now respond to the
<a href="http://llvm.cs.uiuc.edu/PR413"><tt>--version</tt> option</a> which
will tell you the version of LLVM on which the tool is based.</li>
<li>An experimental PowerPC backend has been added, capable of compiling several
SPEC benchmarks.</li>
</ol> </ol>
</div> </div>
@ -165,18 +100,8 @@ In this release, the following missing features were implemented:
<div class="doc_text"> <div class="doc_text">
<ol> <ol>
<li><a href="http://llvm.cs.uiuc.edu/PR82">LLVM cannot handle structures with <li><a href="http://llvm.org/PR419">JIT interface should support arbitrary
more than 256 elements</a></li> calls</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR38">[bugpoint] External functions used in
non-instruction entities, such as global constant initializer</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR178">Stacker does not handle targets
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> </ol>
</div> </div>
@ -190,28 +115,7 @@ issues were fixed:</a>
<div class="doc_text"> <div class="doc_text">
<ol> <ol>
<li><a href="http://llvm.cs.uiuc.edu/PR305">LLVM tools will happily spew <li></li>
bytecode onto your terminal</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR329">[llvmgcc] type names are not emitted
for structure typedefs</a></li>
<li>All documentation is now conformant to the HTML 4.01 (Strict) level.</li>
<li>The spurious "WARNING: Found global types that are not compatible" warning
produced when linking C++ programs has been fixed.</li>
<li><a href="http://llvm.cs.uiuc.edu/PR391">lli Doesn't Handle Exceptions From
Bytecode Reader</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR392">Global Vars Have (Somewhat) Limited
Type Range</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR341">operator&lt;&lt; on a Value* now
prints the address of the object instead of its contents.</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>
<li>The LLVM linker and many core classes have been sped up substantially.</li>
</ol> </ol>
</div> </div>
@ -223,14 +127,7 @@ In this release, the following build problems were fixed:
<div class="doc_text"> <div class="doc_text">
<ol> <ol>
<li><a href="http://llvm.cs.uiuc.edu/PR301">Minor configure bugs with <li></li>
-disable/enable-povray and -disable-spec</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR289">shell scripts output by gccld don't
work if you change PATH</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR364">[llvmgcc] llvmgcc does not compile
with gcc 3.4</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR373">[llvmgcc] obstack.h relies on
obsolete casts-as-lvalues GCC extension</a></li>
</ol> </ol>
</div> </div>
@ -242,51 +139,7 @@ improvements:</a>
<div class="doc_text"> <div class="doc_text">
<ol> <ol>
<li>Fixed: <a href="http://llvm.cs.uiuc.edu/PR309">[vmcore] Code quality problem <li></li>
due to long operand of getelementptr</a></li>
<li>The X86 backend now generates substantially better code for 64-bit integer
and floating point operations.</li>
<li>The -inline pass no longer inlines mutually recursive functions until it
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
<tt>select</tt> instruction.</li>
<li>The -loopsimplify pass can now break <a
href="http://llvm.cs.uiuc.edu/PR35">natural loops with multiple backedges</a>
into multiple nested loops. This enables a variety of subsequent
optimizations.</li>
<li>The -adce pass can now eliminate calls to functions that do not not write to
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
&gt; C)</tt>" into "<tt>if (A &lt; B | A &gt; C)</tt>"</li>
<li>LLVM now has infrastructure for (simple and sparse conditional) constant
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
loops</a> in the code to help C compilers whose optimizers do not recognize
loops formed from gotos (like GCC).</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> </ol>
</div> </div>
@ -301,38 +154,13 @@ were fixed:</a>
<p>Bugs fixed in the LLVM Core:</p> <p>Bugs fixed in the LLVM Core:</p>
<ol> <ol>
<li><a href="http://llvm.cs.uiuc.edu/PR306">[loopsimplify] Loop simplify <li></li>
incorrectly updates dominator information</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR310">[tailduplicate] DemoteRegToStack
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/PR330">[vmcore] Linker causes erroneous
asssertion</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR332">[adce] Crash handling unreachable
code that unwinds</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR333">[sparcv9] LLC can't emit 2 functions
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/PR369">[X86] stackifier crash on floating
point setcc X, X</a></li>
</ol> </ol>
<p>Bugs in the C/C++ front-end:</p> <p>Bugs in the C/C++ front-end:</p>
<ol> <ol>
<li><a href="http://llvm.cs.uiuc.edu/PR298">[llvmgcc] Variable length array <li></li>
indexing miscompiled</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR326">[llvmgcc] Crash on use of undeclared
enum type</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR355">[llvmgcc] Errors handling function
prototypes that take opaque structs by-value</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR374">[llvmgcc] Crash compiling variable
length array of structures</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR377">[llvmgcc] miscompilation of staticly
initialized unsigned bitfields</a></li>
<li><a href="http://llvm.cs.uiuc.edu/PR396">[llvm-gcc] Crash casting function to void</a></li>
</ol> </ol>
</div> </div>