<html>
<head>
<link rel="stylesheet" href="llvm.css" type="text/css">
- <title>LLVM 1.1 Release Notes</title>
+ <title>LLVM 1.2 Release Notes</title>
</head>
<body>
<div class="doc_title">
- LLVM 1.1 Release Notes
+ LLVM 1.2 Release Notes
</div>
<ol>
<li><a href="#install-instructions">Installation Instructions</a></li>
<li><a href="#knownproblems">Known Problems</a>
<ul>
-<!-- <li><a href="#portabilityprobs">Portability Problems</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>
</ol>
<div class="doc_text">
- <p><b>Written by
<a href="mailto:sabre@nondot.org">Chris Lattner</a></b><p>
+ <p><b>Written by
the <a href="http://llvm.cs.uiuc.edu">LLVM team</a></b><p>
</div>
<!-- *********************************************************************** -->
<div class="doc_text">
<p>This document contains the release notes for the LLVM compiler
-infrastructure, release 1.1. Here we describe the status of LLVM, including any
-known problems, and bug fixes from the previous release. The most up-to-date
+infrastructure, release 1.2. 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/1.1/">LLVM 1.1 web site</a>. If you are
-not reading this on the LLVM web pages, you should probably go there, because
+href="http://llvm.cs.uiuc.edu/releases/1.2/">LLVM 1.2 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>
<p>For more information about LLVM, including information about potentially more
<div class="doc_text">
-<p>This is the second public release of the LLVM compiler infrastructure. This
-release is primarily a bugfix release, dramatically improving the C/C++
-front-end, and improving support for C++ in the LLVM core. This release also
-includes a few new features, such as a simple profiler, support for Mac OS/X,
-better interoperability with external source bases, a new example language
-front-end, and improvements in a few optimizations.</p>
-
-<p>At this time, LLVM is known to correctly compile the C & C++ SPEC CPU2000
-benchmarks with the C backend (X86 only), 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 much less testing than the C
-front-end.
+<p>This is the third public release of the LLVM compiler infrastructure.
</p>
-<p>
-Note that the Sparc and X86 backends do not currently support exception throwing
-or long jumping (including 253.perlbmk in SPEC). For these programs, you must
-use the C backend. Support for unwinding will be added in a future release.
+<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>
</div>
<ol>
-<li><a
-href="http://mail.cs.uiuc.edu/pipermail/llvmdev/2003-November/000528.html">A new
-LLVM profiler, similar to gprof</a> is available</li>
-
-<li>LLVM and the C/C++ front-end now compile on Mac OS/X! Mac OS/X users can
-now explore the LLVM optimizer with the C backend and interpreter. Note that
-LLVM requires GCC 3.3 on Mac OS/X.</li>
-
-<li>LLVM has been <a
-href="http://mail.cs.uiuc.edu/pipermail/llvmdev/2003-November/000554.html">moved
-into an 'llvm' C++ namespace</a>, for easier integration with third-party
-code. Note that due to lack of namespace support in GDB 5.x, you will probably
-want to upgrade to GDB 6 or better to debug LLVM code.</li>
-
-<li>
-The build system now copies Makefiles dynamically from the source tree to the
-object tree as subdirectories are built. This means that:
- <ol>
- <li>
- New directories can be added to the source tree, and the build will
- automatically pick them up (i.e. no need to re-run <tt>configure</tt>).
- </li>
-
- <li>
- You will need to build LLVM from the top of the object tree once to ensure
- that all of the Makefiles are copied into the object tree subdirectories.
- </li>
- </ol>
-</li>
-
-<li>A front-end for "Stacker" (a simple Forth-like language) is now
- <a href="http://llvm.cs.uiuc.edu/PR136">included in the main LLVM tree</a>.
- Additionally, Reid Spencer, the author, contributed a document <a href="Stacker.html">describing his experiences writing Stacker, and the language itself</a>. This document is invaluable for others writing front-ends targetting LLVM.</li>
-
-<li>The <tt>configure</tt> script will now configure all projects placed in the
-<tt>llvm/projects</tt> directory.</li>
-
-<li>The <tt>-tailcallelim</tt> pass can now introduce "accumulator" variables
- to transform functions in many common cases that it could not before.</li>
-
-<li>The <tt>-licm</tt> pass can now sink instructions out the bottom of loops
-in addition to being able to hoist them out the top.</li>
-
-<li>The <tt>-basicaa</tt> pass (the default alias analysis) has been upgraded
-to be <a href="http://llvm.cs.uiuc.edu/PR86">significantly more
-precise</a>.</li>
-
-<li>LLVM 1.1 implements a simple size optimization for LLVM bytecode files.
- This means that the 1.1 files are smaller than 1.0, but that 1.0 won't
- read 1.1 bytecode files.</li>
-
-<li><a href="http://llvm.cs.uiuc.edu/PR140">The gccld program produces a runner script that includes command-line options to load the necessary shared objects.</a></li>
+<li><a href="SourceLevelDebugging.html">A new LLVM source-level debugger has been started.</a></li>
+<li></li>
</ol>
</div>
<ol>
-<li><a href="http://llvm.cs.uiuc.edu/PR88">The interpreter does not support
-invoke or unwind</a></li>
-
-<li><a href="http://llvm.cs.uiuc.edu/PR99">Interpreter does not support the
-<tt>vaarg</tt> instruction</a></li>
-
-<li><a href="http://llvm.cs.uiuc.edu/PR117">llvm-nm cannot read archive
-files</a></li>
-
-<li><a href="http://llvm.cs.uiuc.edu/PR146">Interpreter does not handle
-setne constant expression</a></li>
+<li><a href="http://llvm.cs.uiuc.edu/PR16">Exception handling support in the X86
+& Sparc native code generators</a></li>
</ol>
<!--=========================================================================-->
<div class="doc_subsubsection">
-In this release, the following Quality of Implementation issues were
-fixed:
+In this release, the following Quality of Implementation issues were fixed:
</div>
<ol>
-<li>The C++ front-end now compiles functions to
- <a href="http://llvm.cs.uiuc.edu/PR29">use the linkonce linkage type</a>
- more, giving the optimizer more freedom.</a></li>
-
-<li>The C front-end now <a href="http://llvm.cs.uiuc.edu/PR84">generates
- type-safe code</a> in several cases that it did not before, which prevented
- some important optimizations.</li>
-
-<li>The LLVM build system has been taught to catch some common configuration
- problems that <a href="http://llvm.cs.uiuc.edu/PR96">caused it to get
- horribly confused</a> before.</li>
-
-<li>The LLVM header files are now
- <a href="http://llvm.cs.uiuc.edu/PR114">-Wold-style-cast clean</a>.</li>
-
-<li>The LLVM bytecode reader has been <a
-href="http://llvm.cs.uiuc.edu/PR127">sped up a lot</a> (up to 4x in some
-cases).</li>
+<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>
+</ol>
-<li>In C++, methods and functions in anonymous namespaces <a href="http://llvm.cs.uiuc.edu/PR85">now get internal linkage</a>.</li>
+<!--=========================================================================-->
+<div class="doc_subsubsection">
+LLVM gained several improvements to its build and installation
+infrastructure in this release. There is now
+a <tt>autoconf/AutoRegen.sh</tt> script that you can run to rebuild the
+<tt>configure</tt> script and its associated files
+(<a href="http://llvm.cs.uiuc.edu/PR105">Bug 105</a>) as well as beta support
+for "make install" (<a href="http://llvm.cs.uiuc.edu/PR208">Bug 208</a> and
+<a href="http://llvm.cs.uiuc.edu/PR220">Bug 220</a>) and RPM package generation
+(<a href="http://llvm.cs.uiuc.edu/PR203">Bug 203</a>).
+Additionally, in this release, the following build problems were fixed:
+</div>
-<li>Constant initializers now generate loops instead of potentially <a href="http://llvm.cs.uiuc.edu/PR75">huge amounts of straight-line code</a>.</li>
+<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>
+</ol>
-<li>Code for running C++ destructors is now properly shared when possible. Before, the C++ front-end
-<a href="http://llvm.cs.uiuc.edu/PR11">generated N^2 amounts of duplicated cleanup code</a> in some cases.</li>
+<!--=========================================================================-->
+<div class="doc_subsubsection">
+In this release, the following Code Quality issues were fixed:
+</div>
-<li>The JIT used to <a href="http://llvm.cs.uiuc.edu/PR177">generate code for
- all functions pointed to by globals</a> immediately, before the program
- started execution, but now it waits until the first time they are called to
- compile them. This dramatically speeds up short runs of large C++ programs,
- which often have large numbers of functions pointed to by vtables.</li>
+<ol>
+<li><a href="http://llvm.cs.uiuc.edu/PR187">[loopsimplify] Many pointless phi nodes are created</a></li>
+<li>The X86 backend didn't generate <tt>fchs</tt> to negate floating point numbers</li>
+<li>The X86 backend didn't expand memcpy() into the <tt>rep movs</tt> instruction</li>
</ol>
<p>Bugs in the LLVM Core:</p>
<ol>
-<li><a href="http://llvm.cs.uiuc.edu/PR57">[inliner] Inlining invoke with PHI in unwind target is broken</a></li>
-<li><a href="http://llvm.cs.uiuc.edu/PR58">[linker] linkonce globals should link successfully to external globals</a></li>
-<li><a href="http://llvm.cs.uiuc.edu/PR64">[constmerge] Constant merging pass merges constants with external linkage</a></li>
-<li><a href="http://llvm.cs.uiuc.edu/PR66">[scalarrepl] Scalar Replacement of aggregates is decimating structures it shouldn't be</a></li>
-<li><a href="http://llvm.cs.uiuc.edu/PR70">[instcombine] Resolving invoke inserts cast after terminator</a></li>
-<li><a href="http://llvm.cs.uiuc.edu/PR71">llvm-as crashes when labels are used in phi nodes</a></li>
-<li><a href="http://llvm.cs.uiuc.edu/PR72">[build problem] Callgraph.cpp not pulled in from libipa.a</a></li>
-<li><a href="http://llvm.cs.uiuc.edu/PR77">Variables in scope of output setjmp
-calls should be volatile</a> (Note that this does not effect correctness on
-many platforms, such as X86).</li>
-<li><a href="http://llvm.cs.uiuc.edu/PR83">[X86] Emission of global bool initializers broken</a></li>
-<li><a href="http://llvm.cs.uiuc.edu/PR91">[gccld] The -r (relinking) option does not work correctly</a></li>
-<li><a href="http://llvm.cs.uiuc.edu/PR92">[bcreader] Cannot read shift constant expressions from bytecode file</a></li>
-<li><a href="http://llvm.cs.uiuc.edu/PR93">[lowersetjmp] Lowersetjmp pass breaks dominance properties!</a></li>
-<li><a href="http://llvm.cs.uiuc.edu/PR95">SymbolTable::getUniqueName is very inefficient</a></li>
-<li><a href="http://llvm.cs.uiuc.edu/PR97">bugpoint must not pass -R<directory> to Mach-O linker</a></li>
-<li><a href="http://llvm.cs.uiuc.edu/PR98">[buildscripts] Building into objdir with .o in it fails</a></li>
-<li><a href="http://llvm.cs.uiuc.edu/PR101">[setjmp/longjmp] Linking C programs which use setjmp/longjmp sometimes fail with references to the C++ runtime library!</a></li>
-<li><a href="http://llvm.cs.uiuc.edu/PR107">AsmParser Misses Symbol Redefinition Error</a></li>
-<li><a href="http://llvm.cs.uiuc.edu/PR108">gccld -Lfoo -lfoo fails to find ./foo/libfoo.a</a></li>
-<li><a href="http://llvm.cs.uiuc.edu/PR110">[bcreader] Incorrect cast causes misread forward constant references</a></li>
-<li><a href="http://llvm.cs.uiuc.edu/PR116">[adce] ADCE considers blocks without postdominators to be unreachable</a></li>
-<li><a href="http://llvm.cs.uiuc.edu/PR123">[X86] div and rem constant exprs invalidate iterators!</a></li>
-<li><a href="http://llvm.cs.uiuc.edu/PR130">[vmcore] Symbol table doesn't rename colliding variables during type resolution</a></li>
-<li><a href="http://llvm.cs.uiuc.edu/PR138">Archive reader does not understand 4.4BSD/Mac OS X long filenames</a></li>
-<li><a href="http://llvm.cs.uiuc.edu/PR30">[llvm-ar] Command line arguments have funny syntax</a></li>
+<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/PR235">Tablegen aborts on errors</a></li>
</ol>
+
<p>Bugs in the C/C++ front-end:</p>
<ol>
-<li><a href="http://llvm.cs.uiuc.edu/PR59">C++ frontend can crash when compiling virtual base classes</a></li>
-<li><a href="http://llvm.cs.uiuc.edu/PR62">C backend fails on constant cast expr to ptr-to-anonymous struct</a></li>
-<li><a href="http://llvm.cs.uiuc.edu/PR63">#ident is not recognized by C frontend</a></li>
-<li><a href="http://llvm.cs.uiuc.edu/PR65">C front-end miscompiles the builtin_expect intrinsic!</a></li>
-<li><a href="http://llvm.cs.uiuc.edu/PR67">1.0 precompiled libstdc++ does not include wchar_t support</a></li>
-<li><a href="http://llvm.cs.uiuc.edu/PR68">llvmgcc asserts when compiling functions renamed with asm's</a></li>
-<li><a href="http://llvm.cs.uiuc.edu/PR69">C frontend crashes on some programs with lots of types.</a></li>
-<li><a href="http://llvm.cs.uiuc.edu/PR79">llvm-gcc crashes compiling global union initializer</a></li>
-<li><a href="http://llvm.cs.uiuc.edu/PR80">C front-end crash on empty structure</a></li>
-<li><a href="http://llvm.cs.uiuc.edu/PR81">CFrontend crashes when compiling C99 compound expressions</a></li>
-<li><a href="http://llvm.cs.uiuc.edu/PR87">llvm-gcc infinite loops on "case MAXINT:"</a></li>
-<li><a href="http://llvm.cs.uiuc.edu/PR89">[C++] Catch blocks make unparsable labels</a></li>
-<li><a href="http://llvm.cs.uiuc.edu/PR90">[C++] Initializing array with constructable objects fail</a></li>
-<li><a href="http://llvm.cs.uiuc.edu/PR94">llvm-gcc tries to add bools</a></li>
-<li><a href="http://llvm.cs.uiuc.edu/PR104">[c++] C++ Frontend lays out superclasses like anonymous bitfields!</a></li>
-<li><a href="http://llvm.cs.uiuc.edu/PR54">C front-end miscompiles unsigned enums whose LLVM types are signed</a></li>
-<li><a href="http://llvm.cs.uiuc.edu/PR112">Casting a string constant to void crashes llvm-gcc</a></li>
-<li><a href="http://llvm.cs.uiuc.edu/PR125">[llvmg++] Enum types are incorrectly shrunk to smaller than 'int' size</a></li>
-<li><a href="http://llvm.cs.uiuc.edu/PR128">[llvmg++] Cannot use pointer to member to initialize global</a></li>
-<li><a href="http://llvm.cs.uiuc.edu/PR131">[llvm-gcc] ?: operator as lvalue not implemented</a></li>
-<li><a href="http://llvm.cs.uiuc.edu/PR133">[C/C++] Bogus warning about taking the address of 'register' variable</a></li>
-<li><a href="http://llvm.cs.uiuc.edu/PR113">crash assigning into an array in a struct which contains a bitfield</a>.</li>
-<li><a href="http://llvm.cs.uiuc.edu/PR6">Oversized integer bitfields cause crash</a></li>
-<li><a href="http://llvm.cs.uiuc.edu/PR141">[llvm-gcc] Bitfields & large array don't mix well</a></li>
-<li><a href="http://llvm.cs.uiuc.edu/PR132">[llvm-gcc] Complex division is not supported</a></li>
-<li><a href="http://llvm.cs.uiuc.edu/PR143">[llvm-gcc] Illegal union field reference</a></li>
-<li><a href="http://llvm.cs.uiuc.edu/PR148">[llvmg++] Front-end attempts to return structure by value</a></li>
-<li><a href="http://llvm.cs.uiuc.edu/PR152">[llvmg++] Pointer to member initializers not supported in constructors</a></li>
-<li><a href="http://llvm.cs.uiuc.edu/PR155">[llvm-gcc] crash on union initialization</a></li>
-<li><a href="http://llvm.cs.uiuc.edu/PR124">[llvm-g++] ?: expressions do not run correct number of destructors!</a></li>
-<li><a href="http://llvm.cs.uiuc.edu/PR157">[llvm-gcc] Pointer & constant results in invalid shift</a></li>
-<li><a href="http://llvm.cs.uiuc.edu/PR165">[llvmg++] call through array of pointers to member functions causes assertion</a></li>
+<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/PR233">[llvmgcc] Structure copies result in a LOT of code</a></li>
</ol>
</div>
<div class="doc_text">
<p>LLVM has been extensively tested on Intel and AMD machines running Red
-Hat Linux and has been tested on Sun UltraSPARC workstations running Solaris 8.
+Hat Linux and FreeBSD. It has also been tested on Sun UltraSPARC workstations running Solaris 8.
Additionally,
-LLVM works on Mac OS/X 10.3 and above, but only with the C backend or
+LLVM works on Mac OS X 10.3 and above, but only with the C backend or
interpreter (no native backend for the PowerPC is available yet).
The core LLVM infrastructure uses "autoconf" for portability, so hopefully we
work on more platforms than that. However, it is likely that we
-missed something, and that minor porting is required to get LLVM to work on
+missed something and that minor porting is required to get LLVM to work on
new platforms. We welcome portability patches and error messages.</p>
</div>
<p>This section contains all known problems with the LLVM system, listed by
component. As new problems are discovered, they will be added to these
sections. If you run into a problem, please check the <a
-href="http://llvm.cs.uiuc.edu/bugs/">LLVM bug database</a>, and submit a bug if
+href="http://llvm.cs.uiuc.edu/bugs/">LLVM bug database</a> and submit a bug if
there isn't already one.</p>
</div>
<li><a href="http://llvm.cs.uiuc.edu/PR82">LLVM cannot handle structures with
more than 256 elements</a>.</li>
+<li>
+The gccld program
+<a href="http://llvm.cs.uiuc.edu/bugs/show_bug.cgi?id=139">
+does not link objects/archives in the order specified on the command line.
+</a>
+</li>
</ul>
-
</div>
<!-- ======================================================================= -->
</div>
<!-- _______________________________________________________________________ -->
-<div class="doc_subsubsection">
- Bugs
-</div>
+<div class="doc_subsubsection">Bugs</div>
<div class="doc_text">
-
<ul>
-
<li>C99 Variable sized arrays do not release stack memory when they go out of
scope. Thus, the following program may run out of stack space:
<pre>
}
</pre></li>
+<li>
+Initialization of global union variables can only be done
+<a href="http://llvm.cs.uiuc.edu/bugs/show_bug.cgi?id=162">with the largest
+union member</a>.
+</li>
</ul>
-
</div>
<!-- _______________________________________________________________________ -->
the following extensions are known to <b>not be</b> supported:
<ol>
<li><a href="http://gcc.gnu.org/onlinedocs/gcc/Local-Labels.html#Local%20Labels">Local Labels</a>: Labels local to a block.</li>
- <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Labels-as-Values.html#Labels%20as%20Values">Labels as Values</a>: Getting pointers to labels, and computed gotos.</li>
+ <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Labels-as-Values.html#Labels%20as%20Values">Labels as Values</a>: Getting pointers to labels and computed gotos.</li>
<li><a href="http://gcc.gnu.org/onlinedocs/gcc/Nested-Functions.html#Nested%20Functions">Nested Functions</a>: As in Algol and Pascal, lexical scoping of functions.</li>
<li><a href="http://gcc.gnu.org/onlinedocs/gcc/Constructing-Calls.html#Constructing%20Calls">Constructing Calls</a>: Dispatching a call to another function.</li>
<li><a href="http://gcc.gnu.org/onlinedocs/gcc/Extended-Asm.html#Extended%20Asm">Extended Asm</a>: Assembler instructions with C expressions as operands.</li>
- <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Constraints.html#Constraints">Constraints</a>: Constraints for asm operands</li>
+ <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Constraints.html#Constraints">Constraints</a>: Constraints for asm operands.</li>
<li><a href="http://gcc.gnu.org/onlinedocs/gcc/Asm-Labels.html#Asm%20Labels">Asm Labels</a>: Specifying the assembler name to use for a C symbol.</li>
<li><a href="http://gcc.gnu.org/onlinedocs/gcc/Explicit-Reg-Vars.html#Explicit%20Reg%20Vars">Explicit Reg Vars</a>: Defining variables residing in specified registers.</li>
<li><a href="http://gcc.gnu.org/onlinedocs/gcc/Return-Address.html#Return%20Address">Return Address</a>: Getting the return or frame address of a function.</li>
<p>The following GCC extensions are <b>partially</b> supported. An ignored
attribute means that the LLVM compiler ignores the presence of the attribute,
but the code should still work. An unsupported attribute is one which is
- ignored by the LLVM compiler, which will cause a different interpretation of
+ ignored by the LLVM compiler and will cause a different interpretation of
the program.</p>
<ol>
<li><a href="http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html#Function%20Attributes">Function Attributes</a>:
- Declaring that functions have no side effects, or that they can never
+ Declaring that functions have no side effects or that they can never
return.<br>
<b>Supported:</b> <tt>format</tt>, <tt>format_arg</tt>, <tt>non_null</tt>,
<li><a href="http://gcc.gnu.org/onlinedocs/gcc/Subscripting.html#Subscripting">Subscripting</a>: Any array can be subscripted, even if not an lvalue.</li>
<li><a href="http://gcc.gnu.org/onlinedocs/gcc/Pointer-Arith.html#Pointer%20Arith">Pointer Arith</a>: Arithmetic on <code>void</code>-pointers and function pointers.</li>
<li><a href="http://gcc.gnu.org/onlinedocs/gcc/Initializers.html#Initializers">Initializers</a>: Non-constant initializers.</li>
- <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Compound-Literals.html#Compound%20Literals">Compound Literals</a>: Compound literals give structures, unions or arrays as values.</li>
+ <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Compound-Literals.html#Compound%20Literals">Compound Literals</a>: Compound literals give structures, unions,
+or arrays as values.</li>
<li><a href="http://gcc.gnu.org/onlinedocs/gcc/Designated-Inits.html#Designated%20Inits">Designated Inits</a>: Labeling elements of initializers.</li>
<li><a href="http://gcc.gnu.org/onlinedocs/gcc/Cast-to-Union.html#Cast%20to%20Union">Cast to Union</a>: Casting to union type from any member of the union.</li>
<li><a href="http://gcc.gnu.org/onlinedocs/gcc/Case-Ranges.html#Case%20Ranges">Case Ranges</a>: `case 1 ... 9' and such.</li>
<div class="doc_text">
-<p>For this release, the C++ front-end is considered to be fully functional, but
+<p>For this release, the C++ front-end is considered to be fully functional but
has not been tested as thoroughly as the C front-end. It has been tested and
works for a number of non-trivial programs, but there may be lurking bugs.
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>
+ front-end</a>.</li>
</ul>
-
</div>
<!-- _______________________________________________________________________ -->
<li>Destructors for local objects are not always run when a <tt>longjmp</tt> is
performed. In particular, destructors for objects in the <tt>longjmp</tt>ing
function and in the <tt>setjmp</tt> receiver function may not be run.
- Objects in intervening stack frames will be destroyed however (which is
+ Objects in intervening stack frames will be destroyed, however (which is
better than most compilers).</li>
<li>The LLVM C++ front-end follows the <a
<div class="doc_text">
<ul>
-
-<li>The X86 code generator <a
-href="http://llvm.cs.uiuc.edu/PR16">does not currently
-support the <tt>unwind</tt> instruction</a>, so code that throws a C++ exception
-or calls the C <tt>longjmp</tt> function will abort.</li>
-
+<li>None so far.
</ul>
</div>
<div class="doc_text">
<ul>
-
-<li>The Sparc code generator <a
-href="http://llvm.cs.uiuc.edu/PR15">does not currently
-support the <tt>unwind</tt> instruction</a>, so code that throws a C++ exception
-or calls the C <tt>longjmp</tt> function will abort.</li>
-
+<li>None so far.
</ul>
</div>
<div class="doc_text">
<p>A wide variety of additional information is available on the LLVM web page,
-including mailing lists publications describing algorithms and components
+including mailing lists and publications describing algorithms and components
implemented in LLVM. The web page also contains versions of the API
documentation which is up-to-date with the CVS version of the source code. You
can access versions of these documents specific to this release by going into
<hr>
<address>
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