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Some grammar fixes, and non-invasive format changes.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58237 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -98,28 +98,31 @@ generation support is far enough along to build many C applications. While not
yet production quality, it is progressing very nicely. In addition, C++
front-end work has started to make significant progress.</p>
Clang, in conjunction with the <tt>ccc</tt> driver, is now usable as a
replacement for gcc for building some small- to medium-sized C applications.
<p>Clang, in conjunction with the <tt>ccc</tt> driver, is now usable as a
replacement for gcc for building some small- to medium-sized C applications.
Additionally, Clang now has code generation support for Objective-C on Mac OS X
platform. Major highlights include:
platform. Major highlights include:</p>
<ul>
<li> Clang/ccc pass almost all of the LLVM test suite on Mac OS X and Linux
on the 32-bit x86 architecture. This includes significant C
applications such as <a href="http://www.sqlite.org">sqlite3</a>,
<a href="http://www.lua.org">lua</a>, and
<a href="http://www.clamav.net">Clam AntiVirus</a>.
<a href="http://www.clamav.net">Clam AntiVirus</a>. </li>
<li> Clang can build the majority of Objective-C examples shipped with the
Mac OS X Developer Tools.
Mac OS X Developer Tools. </li>
</ul>
Clang code generation still needs considerable testing and development, however.
Some areas under active development include:
<p>Clang code generation still needs considerable testing and development,
however. Some areas under active development include:</p>
<ul>
<li> Improved support for C and Objective-C features, for example
variable-length arrays, va_arg, exception handling (Obj-C), and garbage
collection (Obj-C).
<li> ABI compatibility, especially for platforms other than 32-bit x86.
<li> Improved support for C and Objective-C features, for example
variable-length arrays, va_arg, exception handling (Obj-C), and garbage
collection (Obj-C). </li>
<li> ABI compatibility, especially for platforms other than 32-bit
x86. </li>
</ul>
</div>
@ -145,15 +148,14 @@ has found in industrial-quality software on the order of thousands.</p>
the tool. While still early in development, the GUI illustrates some of the key
features of Clang: accurate source location information, which is used by the
GUI to highlight specific code expressions that relate to a bug (including those
that span multiple lines) and built-in knowledge of macros, which is used to
that span multiple lines); and built-in knowledge of macros, which is used to
perform inline expansion of macros within the GUI itself.</p>
<p>The set of checks performed by the static analyzer is gradually expanding,
and
future plans for the tool include full source-level inter-procedural analysis
and deeper checks such as buffer overrun detection. There are many opportunities
to extend and enhance the static analyzer, and anyone interested in working on
this project is encouraged to get involved!</p>
and future plans for the tool include full source-level inter-procedural
analysis and deeper checks such as buffer overrun detection. There are many
opportunities to extend and enhance the static analyzer, and anyone interested
in working on this project is encouraged to get involved!</p>
</div>
@ -174,15 +176,15 @@ bug fixes, cleanup and new features. The major changes are:</p>
<ul>
<li> Support for generics in the .Net virtual machine.
<li> Initial support for the Mono class libraries.
<li> Support for generics in the .Net virtual machine.</li>
<li> Initial support for the Mono class libraries. </li>
<li> Support for MacOSX/x86, following LLVM's support for exceptions in
JIT on MacOSX/x86.
<li> A new vmkit driver: a program to run java or .net applications. The
driver supports llvm command line arguments including the new "-fast" option.
JIT on MacOSX/x86. </li>
<li> A new vmkit driver: a program to run java or .net applications. The driver
supports llvm command line arguments including the new "-fast" option. </li>
<li> A new memory allocation scheme in the JVM that makes unloading a
class loader very fast.
<li> VMKit now follows the LLVM Makefile machinery.
class loader very fast. </li>
<li> VMKit now follows the LLVM Makefile machinery. </li>
</ul>
</div>
@ -196,7 +198,7 @@ class loader very fast.
<div class="doc_text">
<p>This release includes a huge number of bug fixes, performance tweaks and
<p>This release includes a huge number of bug fixes, performance tweaks, and
minor improvements. Some of the major improvements and new features are listed
in this section.
</p>
@ -214,24 +216,24 @@ in this section.
<ul>
<li><p>The most visible end-user change in LLVM 2.4 is that it includes many
optimizations and changes to make -O0 compile times much faster. You should see
improvements on the order of 30% (or more) faster than LLVM 2.3. There are many
pieces to this change, described in more detail below. The speedups and new
components can also be used for JIT compilers that want fast compilation as
well.</p></li>
improvements in speed on the order of 30% (or more) than in LLVM 2.3. There are
many pieces to this change described in more detail below. The speedups and new
components can also be used for JIT compilers that want fast
compilation.</p></li>
<li><p>The biggest change to the LLVM IR is that Multiple Return Values (which
were introduced in LLVM 2.3) have been generalized to full support for "First
Class Aggregate" values in LLVM 2.4. This means that LLVM IR supports using
structs and arrays as values in a function. This capability is mostly useful
for front-end authors, who prefer to treat things like complex numbers, simple
tuples, dope vectors, etc as Value*'s instead of as a tuple of Value*'s or as
tuples, dope vectors, etc., as Value*'s instead of as a tuple of Value*'s or as
memory values. Bitcode files from LLVM 2.3 will automatically migrate to the
general representation.</p></li>
<li><p>LLVM 2.4 also includes an initial port for the PIC16 microprocessor. This
is the LLVM target that only has support for 8 bit registers, and a number of
other crazy constraints. While the port is still in early development stages,
it shows some interesting things you can do with LLVM.</p></li>
target only has support for 8 bit registers, and a number of other crazy
constraints. While the port is still in early development stages, it shows some
interesting things you can do with LLVM.</p></li>
</ul>
@ -251,20 +253,20 @@ includes support for the C, C++, Objective-C, Ada, and Fortran front-ends.</p>
<ul>
<li>LLVM 2.4 supports the full set of atomic <tt>__sync_*</tt> builtins. LLVM
2.3 only supported those used by OpenMP, but 2.4 supports them all. While
llvm-gcc supports all of these builtins, note that not all targets do. X86
support them all in both 32-bit and 64-bit mode and PowerPC supports them all
except for the 64-bit operations when in 32-bit mode.</li>
2.3 only supported those used by OpenMP, but 2.4 supports them all. Note that
while llvm-gcc supports all of these builtins, not all targets do. X86 support
them all in both 32-bit and 64-bit mode and PowerPC supports them all except for
the 64-bit operations when in 32-bit mode.</li>
<li>llvm-gcc now supports an <tt>-flimited-precision</tt> option, which tells
the compiler that it is ok to use low-precision approximations of certain libm
functions (like tan, log, etc). This allows you to get high performance if you
only need (say) 14-bits of precision.</li>
the compiler that it is okay to use low-precision approximations of certain libm
functions (like <tt>exp</tt>, <tt>log</tt>, etc). This allows you to get high
performance if you only need (say) 12-bits of precision.</li>
<li>llvm-gcc now supports a C language extension known as "<a
href="http://lists.cs.uiuc.edu/pipermail/cfe-dev/2008-August/002670.html">Blocks</a>".
This feature is similar to nested functions and closures, but does not
require stack trampolines (with most ABIs) and supports returning closures
require stack trampolines (with most ABIs), and supports returning closures
from functions that define them. Note that actually <em>using</em> Blocks
requires a small runtime that is not included with llvm-gcc.</li>
@ -284,8 +286,7 @@ Previously, LTO could only be used with -O4, which implied optimizations in
</div>
<div class="doc_text">
<p>New features include:
</p>
<p>New features include:</p>
<ul>
<li>A major change to the <tt>Use</tt> class landed, which shrank it by 25%. Since
@ -298,14 +299,14 @@ nicely. They now print as "<tt>%3 = add i32 %A, 4</tt>" instead of
</li>
<li>LLVM 2.4 includes some changes for better vector support. First, the shift
operations (<tt>shl</tt>, <tt>ashr</tt>, <tt>lshr</tt>) now all support vectors
and do an element-by-element shift (shifts of the whole vector can be
accomplished by bitcasting the vector to &lt;1 x i128&gt; for example). Second,
there is initial support in development for vector comparisons with the
<a href="LangRef.html#i_fcmp">fcmp</a>/<a href="LangRef.html#i_icmp">icmp</a>
operations (<tt>shl</tt>, <tt>ashr</tt>, and <tt>lshr</tt>) now all support
vectors and do an element-by-element shift (shifts of the whole vector can be
accomplished by bitcasting the vector to &lt;1 x i128&gt;, for example). Second,
there is initial support in development for vector comparisons with the
<tt><a href="LangRef.html#i_fcmp">fcmp</a>/<a href="LangRef.html#i_icmp">icmp</a></tt>
instructions. These instructions compare two vectors and return a vector of
i1's for each result. Note that there is very little codegen support available
for any of these IR features though.</li>
<tt>i1</tt>'s for each result. Note that there is very little codegen support
available for any of these IR features though.</li>
<li>A new <tt>DebugInfoBuilder</tt> class is available, which makes it much
easier for front-ends to create debug info descriptors, similar to the way that
@ -317,11 +318,11 @@ constant folding. The <tt>NoFolder</tt> class does no constant folding at all,
useful when learning how LLVM works. The <tt>TargetFolder</tt> class folds the most,
doing target dependent constant folding.</li>
<li>LLVM now supports "function attributes", which allows us to separate return
<li>LLVM now supports "function attributes", which allow us to separate return
value attributes from function attributes. LLVM now supports attributes on a
function itself, a return value, and its parameters. New supported function
attributes include noinline/alwaysinline and the "opt-size" flag which says the
function should be optimized for code size.</li>
attributes include <tt>noinline/alwaysinline</tt> and the <tt>opt-size</tt> flag,
which says the function should be optimized for code size.</li>
<li>LLVM IR now directly represents "common" linkage, instead of
representing it as a form of weak linkage.</li>