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Scrub all LLVM 1.3 stuff, changing over to 1.4. Add info about PR419,
which is now fixed. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15800 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
parent
cc22e9f406
commit
5c3389a084
@ -3,11 +3,11 @@
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<html>
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<head>
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<link rel="stylesheet" href="llvm.css" type="text/css">
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<title>LLVM 1.3 Release Notes</title>
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<title>LLVM 1.4 Release Notes</title>
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</head>
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<body>
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<div class="doc_title">LLVM 1.3 Release Notes</div>
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<div class="doc_title">LLVM 1.4 Release Notes</div>
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<ol>
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<li><a href="#intro">Introduction</a></li>
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@ -41,10 +41,10 @@
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<div class="doc_text">
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<p>This document contains the release notes for the LLVM compiler
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infrastructure, release 1.3. Here we describe the status of LLVM, including any
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infrastructure, release 1.4. Here we describe the status of LLVM, including any
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known problems and bug fixes from the previous release. The most up-to-date
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version of this document can be found on the <a
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href="http://llvm.cs.uiuc.edu/releases/1.3/">LLVM 1.3 web site</a>. If you are
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href="http://llvm.cs.uiuc.edu/releases/1.4/">LLVM 1.4 web site</a>. If you are
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not reading this on the LLVM web pages, you should probably go there because
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this document may be updated after the release.</p>
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@ -69,12 +69,7 @@ href="http://llvm.cs.uiuc.edu/releases/">releases page</a>.</p>
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<div class="doc_text">
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<p>This is the fourth public release of the LLVM compiler infrastructure. This
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release primarily improves the <a href="#codequality">performance of the
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code</a> produced by all aspects of the LLVM compiler, adds many <a
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href="#newfeatures">new features</a>, <a href="#bugfix">fixes a few
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bugs</a>, speeds up the compiler, and introduces a new (experimental)
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PowerPC code generator.</p>
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<p>This is the fifth public release of the LLVM compiler infrastructure.</p>
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<p> At this time, LLVM is known to correctly compile and run all C & C++
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SPEC CPU95 & 2000 benchmarks, the Olden benchmarks, and the Ptrdist
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@ -91,67 +86,7 @@ with a broad variety of C++ programs.</p>
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<div class="doc_text">
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<ol>
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<li>The LLVM <a href="LangRef.html#i_select"><tt>select</tt></a> instruction is
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now fully implemented and supported by all transformations, native code
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generators, and the interpreter.</li>
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<li>Bugpoint can now narrow down code-generation bugs to a loop nest, where
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before it could only narrow them down to a function being miscompiled.</li>
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<li><a href="http://llvm.cs.uiuc.edu/PR40">Bugpoint can now debug arbitrary
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modes of llc</a> and lli, by passing them command line flags (e.g.
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<tt>-regalloc=linearscan</tt>).</li>
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<li>The Control Flow Graph in the native code generators is no longer
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constrained to be the same as the CFG for the LLVM input code.</li>
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<li>The LLVM induction variable analysis routines have been rewritten.</li>
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<li>LLVM now has new loop unrolling and loop unswitching passes.</li>
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<li>The induction variable substitution pass performs linear function test
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replacement and exit value replacement optimizations.</li>
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<li>LLVM now has first-class support for <a
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href="GarbageCollection.html">Accurate Garbage Collection</a>, enabling the use
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of aggressive copying and generational collectors.</li>
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<li>LLVM now includes a simple implementation of <a
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href="AliasAnalysis.html#anders-aa">Andersen's interprocedural alias
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analysis</a> algorithm.</li>
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<li>Bugpoint can <a href="http://llvm.cs.uiuc.edu/PR327">extract individual
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basic blocks</a> to track down reduce miscompilation testcases.</li>
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<li>LLVM and the C front-end now work under Win32 using the
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<a href="http://www.cygwin.com">Cygwin</a> runtime libraries.
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This includes the JIT compiler.</li>
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<li>The LLVM code generator is now being <a
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href="CodeGenerator.html">documented</a>.</li>
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<li>LLVM includes a new tool, <a
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href="CommandGuide/html/llvm-bcanalyzer.html">llvm-bcanalyzer</a>, This tool
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can compute various statistics and dump information about LLVM bytecode
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encoding.</li>
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<li>The <a href="BytecodeFormat.html">LLVM bytecode file format</a> is now
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documented.</li>
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<li>LLVM now provides an <a
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href="LangRef.html#i_isunordered">llvm.isunordered</a> intrinsic for efficient
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implementation of unordered floating point comparisons.</li>
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<li>The llvmgcc front-end now supports the GCC builtins for ISO C99 floating
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point comparison macros (e.g., <tt>__builtin_islessequal</tt>).</li>
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<li>We now generate <a href="CommandGuide/">HTML documentation and man pages</a>
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for the tools from a single source (perl-style POD files).</li>
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<li>The LLVM code generator can now dynamically load targets from shared
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objects.</li>
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<li>LLVM now includes a "skeleton" target, which makes it easier to get
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started porting LLVM to new architectures.</li>
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<li>The linear scan register allocator is now enabled by default in the
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target-independent code generator.</li>
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<li>LLVM now includes a dead store elimination pass.</li>
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<li>Bugpoint can now debug miscompilations that lead to the program going
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into an infinite loop.</li>
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<li>LLVM now provides interfaces to support ML-style pattern matching on the
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LLVM IR.</li>
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<li>LLVM now includes a <a
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href="AliasAnalysis.html#globalsmodref">context-sensitive mod/ref analysis</a>
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for global variables, which is now enabled by default in gccld.</li>
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<li>LLVM can now autogenerate assembly printers for code generators from the
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tablegen description of the target (before they were hand coded).</li>
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<li>All LLVM tools will now respond to the
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<a href="http://llvm.cs.uiuc.edu/PR413"><tt>--version</tt> option</a> which
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will tell you the version of LLVM on which the tool is based.</li>
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<li>An experimental PowerPC backend has been added, capable of compiling several
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SPEC benchmarks.</li>
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<li></li>
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</ol>
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</div>
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@ -165,18 +100,8 @@ In this release, the following missing features were implemented:
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<div class="doc_text">
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<ol>
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<li><a href="http://llvm.cs.uiuc.edu/PR82">LLVM cannot handle structures with
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more than 256 elements</a></li>
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<li><a href="http://llvm.cs.uiuc.edu/PR38">[bugpoint] External functions used in
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non-instruction entities, such as global constant initializer</a></li>
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<li><a href="http://llvm.cs.uiuc.edu/PR178">Stacker does not handle targets
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with 64-bit pointers.</a></li>
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<li><a href="http://llvm.cs.uiuc.edu/PR290">Bugpoint doesn't support
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uses of external fns by immediate constant exprs</a></li>
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<li><a href="http://llvm.cs.uiuc.edu/PR407">Can't add function passes that
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depend on immutable passes to the FunctionPassManager</a>.</li>
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<li><a href="http://llvm.cs.uiuc.edu/PR308">Archive file reader doesn't
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understand abbreviated names in headers</a></li>
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<li><a href="http://llvm.org/PR419">JIT interface should support arbitrary
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calls</a></li>
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</ol>
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</div>
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@ -190,28 +115,7 @@ issues were fixed:</a>
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<div class="doc_text">
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<ol>
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<li><a href="http://llvm.cs.uiuc.edu/PR305">LLVM tools will happily spew
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bytecode onto your terminal</a></li>
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<li><a href="http://llvm.cs.uiuc.edu/PR329">[llvmgcc] type names are not emitted
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for structure typedefs</a></li>
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<li>All documentation is now conformant to the HTML 4.01 (Strict) level.</li>
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<li>The spurious "WARNING: Found global types that are not compatible" warning
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produced when linking C++ programs has been fixed.</li>
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<li><a href="http://llvm.cs.uiuc.edu/PR391">lli Doesn't Handle Exceptions From
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Bytecode Reader</a></li>
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<li><a href="http://llvm.cs.uiuc.edu/PR392">Global Vars Have (Somewhat) Limited
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Type Range</a></li>
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<li><a href="http://llvm.cs.uiuc.edu/PR341">operator<< on a Value* now
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prints the address of the object instead of its contents.</a></li>
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<li><a href="http://llvm.cs.uiuc.edu/PR402">Bytecode Enhancements
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Needed</a></li>
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<li><a href="http://llvm.cs.uiuc.edu/PR404">[loopsimplify] Loop simplify is
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really slow on 252.eon</a></li>
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<li><a href="Http://llvm.cs.uiuc.edu/PR122">[code-cleanup] SymbolTable class
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cleanup, Type should not derive from Value, eliminate ConstantPointerRef
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class</a>.</li>
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<li>The memory footprint of the LLVM IR has been reduced substantially.</li>
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<li>The LLVM linker and many core classes have been sped up substantially.</li>
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<li></li>
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</ol>
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</div>
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@ -223,14 +127,7 @@ In this release, the following build problems were fixed:
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<div class="doc_text">
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<ol>
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<li><a href="http://llvm.cs.uiuc.edu/PR301">Minor configure bugs with
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-disable/enable-povray and -disable-spec</a></li>
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<li><a href="http://llvm.cs.uiuc.edu/PR289">shell scripts output by gccld don't
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work if you change PATH</a></li>
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<li><a href="http://llvm.cs.uiuc.edu/PR364">[llvmgcc] llvmgcc does not compile
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with gcc 3.4</a></li>
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<li><a href="http://llvm.cs.uiuc.edu/PR373">[llvmgcc] obstack.h relies on
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obsolete casts-as-lvalues GCC extension</a></li>
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<li></li>
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</ol>
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</div>
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@ -242,51 +139,7 @@ improvements:</a>
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<div class="doc_text">
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<ol>
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<li>Fixed: <a href="http://llvm.cs.uiuc.edu/PR309">[vmcore] Code quality problem
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due to long operand of getelementptr</a></li>
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<li>The X86 backend now generates substantially better code for 64-bit integer
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and floating point operations.</li>
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<li>The -inline pass no longer inlines mutually recursive functions until it
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hits the inlining threshold.</li>
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<li>The -inline pass no longer misses obvious inlining opportunities just
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because the callee eventually calls into an external function.</li>
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<li>The -simplifycfg pass can now "if convert" simple statements into the
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<tt>select</tt> instruction.</li>
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<li>The -loopsimplify pass can now break <a
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href="http://llvm.cs.uiuc.edu/PR35">natural loops with multiple backedges</a>
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into multiple nested loops. This enables a variety of subsequent
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optimizations.</li>
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<li>The -adce pass can now eliminate calls to functions that do not not write to
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memory.</li>
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<li>The link-time optimizer now runs the -prune-eh pass (to remove unused
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exception handlers).</li>
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<li>The link-time optimizer now runs dead store elimination and uses a simple
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interprocedural alias analysis.</li>
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<li>The -simplifycfg pass can now eliminate simple correlated branches (such as
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"<tt>if (A < B && A < B)</tt>", and can turn short-circuiting
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operators into the strict versions when useful (such as "<tt>if (A < B || A
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> C)</tt>" into "<tt>if (A < B | A > C)</tt>"</li>
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<li>LLVM now has infrastructure for (simple and sparse conditional) constant
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propagation of function calls. It currently supports a few math library
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functions like sqrt/sin/cos/etc.</li>
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<li>The C backend now emits <a href="http://llvm.cs.uiuc.edu/PR334">syntactic
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loops</a> in the code to help C compilers whose optimizers do not recognize
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loops formed from gotos (like GCC).</li>
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<li>The SparcV9 backend no longers <a
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href="http://llvm.cs.uiuc.edu/PR368">spills the null constant to the constant
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pool</a>.</li>
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<li></li>
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</ol>
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</div>
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@ -301,38 +154,13 @@ were fixed:</a>
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<p>Bugs fixed in the LLVM Core:</p>
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<ol>
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<li><a href="http://llvm.cs.uiuc.edu/PR306">[loopsimplify] Loop simplify
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incorrectly updates dominator information</a></li>
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<li><a href="http://llvm.cs.uiuc.edu/PR310">[tailduplicate] DemoteRegToStack
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breaks SSA form</a></li>
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<li><a href="http://llvm.cs.uiuc.edu/PR313">[X86] JIT miscompiles unsigned short
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to floating point cast</a></li>
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<li><a href="http://llvm.cs.uiuc.edu/PR330">[vmcore] Linker causes erroneous
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asssertion</a></li>
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<li><a href="http://llvm.cs.uiuc.edu/PR332">[adce] Crash handling unreachable
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code that unwinds</a></li>
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<li><a href="http://llvm.cs.uiuc.edu/PR333">[sparcv9] LLC can't emit 2 functions
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of the same name, both having constant pools</a></li>
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<li><a href="http://llvm.cs.uiuc.edu/PR337">[livevar] Live variables missed
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physical register use of aliased definition</a></li>
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<li><a href="http://llvm.cs.uiuc.edu/PR369">[X86] stackifier crash on floating
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point setcc X, X</a></li>
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<li></li>
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</ol>
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<p>Bugs in the C/C++ front-end:</p>
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<ol>
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<li><a href="http://llvm.cs.uiuc.edu/PR298">[llvmgcc] Variable length array
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indexing miscompiled</a></li>
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<li><a href="http://llvm.cs.uiuc.edu/PR326">[llvmgcc] Crash on use of undeclared
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enum type</a></li>
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<li><a href="http://llvm.cs.uiuc.edu/PR355">[llvmgcc] Errors handling function
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prototypes that take opaque structs by-value</a></li>
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<li><a href="http://llvm.cs.uiuc.edu/PR374">[llvmgcc] Crash compiling variable
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length array of structures</a></li>
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<li><a href="http://llvm.cs.uiuc.edu/PR377">[llvmgcc] miscompilation of staticly
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initialized unsigned bitfields</a></li>
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<li><a href="http://llvm.cs.uiuc.edu/PR396">[llvm-gcc] Crash casting function to void</a></li>
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<li></li>
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</ol>
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</div>
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