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<head>
<link rel="stylesheet" href="llvm.css" type="text/css">
- <title>LLVM 1.3 Release Notes</title>
+ <title>LLVM 1.4 Release Notes</title>
</head>
<body>
-<div class="doc_title">LLVM 1.3 Release Notes</div>
+<div class="doc_title">LLVM 1.4 Release Notes</div>
<ol>
<li><a href="#intro">Introduction</a></li>
<div class="doc_text">
<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
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
this document may be updated after the release.</p>
<div class="doc_text">
-<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>
+<p>This is the fifth public release of the LLVM compiler infrastructure.</p>
<p> 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>
+SPEC CPU95 & 2000 benchmarks, the Olden benchmarks, and the Ptrdist
+benchmarks, and <b>many</b> other C and C++ programs.</p>
</div>
<div class="doc_text">
<ol>
-<li>The LLVM <a href="LangRef.html#i_select"><tt>select</tt></a> instruction is
-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>, <tt>-enable-correct-eh-support</tt>, etc.) </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 an implementation of Andersen's interprocedural alias
-analysis 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>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
-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>The LLVM code generator can now dynamically load targets from shared
-objects.</li>
+ <li>The test/Programs hierarchy <a href="http://llvm.cs.uiuc.edu/PR257">has
+ been moved out of the main LLVM tree</a> into a separate CVS repo and
+ tarball.</li>
+ <li>LLVM now optimizes global variables significantly more than it did
+ before.</li>
+ <li>LLVM now includes the new '<tt>undef</tt>' value and <a
+ href="LangRef.html#i_unreachable"><tt>unreachable</tt></a> instruction,
+ which give the optimizer more information about the behavior of the
+ program.</li>
</ol>
</div>
<div class="doc_text">
<ol>
-<li><a href="http://llvm.cs.uiuc.edu/PR82">LLVM cannot handle structures with
-more than 256 elements</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/PR419">JIT interface should support
+ arbitrary calls</a></li>
</ol>
</div>
<div class="doc_text">
<ol>
-<li><a href="http://llvm.cs.uiuc.edu/PR305">LLVM tools will happily spew
-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/PR341">operator<< on a Value* now prints the address of the object instead of its contents.</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/PR426">[llvmg++] Tons of warnings are spewed when
+ linking to libstdc++</a></li>
+<li><a href="http://llvm.cs.uiuc.edu/PR352">include/{Support,Config} ->
+ include/llvm/{Support,Config}</a></li>
</ol>
</div>
<div class="doc_text">
<ol>
-<li><a href="http://llvm.cs.uiuc.edu/PR301">Minor configure bugs with
--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>
+<li></li>
</ol>
</div>
<div class="doc_text">
<ol>
-<li>Fixed: <a href="http://llvm.cs.uiuc.edu/PR309">[vmcore] Code quality problem
-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 new
-<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 -simplifycfg pass can now eliminate simple correlated branches (such as
-"<tt>if (A < B && A < B)</tt>", and can turn short-circuiting
-operators into the strict versions when useful (such as "<tt>if (A < B || A
-> C)</tt>" into "<tt>if (A < B | A > 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>Fixed: <a href="http://llvm.cs.uiuc.edu/PR368">[sparcv9] null
-often spilled to constant pool</a>.</li>
+<li><a href="http://llvm.cs.uiuc.edu/PR362">Ugly code generated for
+ std::min/std::max</a></li>
</ol>
</div>
<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
-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/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
-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/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/PR420">[licm] LICM invalidates alias analysis info
+ and uses broken information</a> (optimizer crash)</li>
+<li><a href="http://llvm.cs.uiuc.edu/PR422">[asmwriter] Asmwriter is really slow for
+ functions with lots of values</a></li>
+<li><a href="http://llvm.cs.uiuc.edu/PR423">[anders-aa] Andersen's AA is completely
+ broken in LLVM 1.3</a></li>
+<li><a href="http://llvm.cs.uiuc.edu/PR430">[bcwriter] Empty compaction tables
+ defined</a></li>
</ol>
<p>Bugs in the C/C++ front-end:</p>
<ol>
-<li><a href="http://llvm.cs.uiuc.edu/PR298">[llvmgcc] Variable length array
-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>
+<li><a href="http://llvm.cs.uiuc.edu/PR445">[llvmg++] not enough templates are instantiated</a></li>
+<li><a href="http://llvm.cs.uiuc.edu/PR450">[llvmg++] Extern const globals cannot be
+marked 'constant' if they have nontrivial ctors or dtors</a></li>
+</ol>
+
+<p>Bugs fixed in the Sparc V9 back-end:</p>
+
+<ol>
+<li><a href="http://llvm.cs.uiuc.edu/PR428">[sparcv9] regalloc assertion
+ failure with certain indirect calls</a></li>
</ol>
+
</div>
<!-- *********************************************************************** -->
<li>Intel and AMD machines running Red Hat Linux and FreeBSD (and probably
other unix-like systems).</li>
<li>Sun UltraSPARC workstations running Solaris 8.</li>
-<li>PowerPC-based Mac OS X boxes, running 10.3 and above (C backend and
- interpreter only, no native codegen is available yet).</li>
<li>Intel and AMD machines running on Win32 with the Cygwin libraries.</li>
+<li>PowerPC-based Mac OS X boxes, running 10.2 and above. Note that no JIT
+support is available yet, and LLC support is beta. The C backend can be used
+to produce stable code for this platform.</li>
</ul>
-
<p>The core LLVM infrastructure uses
<a href="http://www.gnu.org/software/autoconf/">GNU autoconf</a> to adapt itself
to the machine and operating system on which it is built. However, minor
LLVM and the C frontend out of a top-level directory without spaces (e.g.,
<tt>/cygdrive/c/llvm</tt>). Also, make sure to install <b>all</b> of the
cygwin packages. By default, many important tools are not installed that
-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>
+are needed by the LLVM build process or test suite (e.g., /bin/time). Finally,
+please make sure that there are no directories with spaces in them in your
+PATH environment variable.</p>
</div>
components, please contact us on the llvmdev list.</p>
<ul>
+<li>The PowerPC backend is incomplete and is known to miscompile several SPEC
+benchmarks. The file <tt>llvm/lib/Target/PowerPC/README.txt</tt> has
+details.</li>
<li>The following passes are incomplete or buggy: <tt>-pgmdep, -memdep,
- -ipmodref, -cee</tt></li>
-
+ -ipmodref, -cee, -branch-combine, -instloops, -paths</tt></li>
<li>The <tt>-pre</tt> pass is incomplete (there are cases it doesn't handle that
it should) and not thoroughly tested.</li>
<li>The <tt>llvm-ar</tt> tool is incomplete and probably buggy.</li>
such, execution of a threaded program could cause these data structures to be
corrupted.</li>
-<li>It is not possible to <tt>dlopen</tt> an LLVM bytecode file in the JIT.</li>
-
-<li>Linking in static archive files (.a files) is very slow (there is no symbol
+<li>Linking in static archive files (.a files) is slow (there is no symbol
table in the archive).</li>
<li>The gccld program <a href="http://llvm.cs.uiuc.edu/PR139">does not link
<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>
+LLVM with C++ objects compiled by other C++ compilers.</li>
+
+</ul>
</div>
<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>
projects / oota-llvm.git / blobdiff