On 02/08/2012 04:30 PM, Jonathan Wakely wrote:
On 08/02/2012, Andrew MacLeod wrote:
On 02/08/2012 04:59 AM, Jonathan Wakely wrote:
Should they be?
How's this look for a news item and the changes file? Formatting seems
fine.
The news item is missing a + in C++
It's not critical for the changes.html page since it's not likely to
be printed, but it's better hyperlink style to say "see the [atomic
wiki]" rather than "see the atomic wiki [here]"
That's what I get for following the same pattern as those TM jokers.
OK, hows this look? I added a link in the news as well.
Andrew
? K
? gcc-4.7/K
Index: index.html
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*************** mission statement</a>.</p>
*** 53,58 ****
--- 53,69 ----
<dl class="news">
+ <dt><span>Atomic memory model support</span>
+ <span class="date">[2011-11-06]</span></dt>
+ <dd>C++11/C11 <a href="http://gcc.gnu.org/wiki/Atomic/GCCMM";>memory model</a>
+ support has been added through a new set of built-in __atomic functions.
+ These new functions allow a memory model to be specified for an
+ operation and some targets may produce more efficient barriers and
+ synchronization code. Generic atomic support has also been added to allow
+ arbitrary sized data to be treated as atomic, and in turn the C++ atomic
+ class has been updated to allow atomic classes to be any size.
+ </dd>
+
<dt><span>Transactional memory support</span>
<span class="date">[2011-11-15]</span></dt>
<dd>An implementation of the
Index: gcc-4.7/changes.html
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*************** void foo (char *a, const char *b, const
*** 223,228 ****
--- 223,249 ----
see <a href="http://gcc.gnu.org/wiki/TransactionalMemory";>here</a>.
</p>
</li>
+
+ <li>
+ <p>
+ Support for atomic operations specifying the C++11/C11 memory model
have
+ been added. These new __atomic routines replace the existing __sync
+ built-in routines.
+ </p>
+ <p>
+ Atomic support is also available for memory blocks. Lock free
+ instructions will be used if a memory block is the same size and
+ alignment as a supported integer type. Atomic operations which do not
+ have lock free support are left as function calls. A set of library
+ functions are available on the GCC atomic wiki in the "External
+ Atomics Library" section.
+ </p>
+ <p>
+ For more details on the memory models and features, see the
+ <a href="http://gcc.gnu.org/wiki/Atomic/GCCMM";>atomic wiki</a>.
+ </p>
+ </li>
+
<li>When a binary operation performed on vector types and one of the
operands
is a uniform vector it is possible to replace the vector with the
generating element. For example:
*************** struct A {
*** 330,335 ****
--- 351,366 ----
A(): A(42) { } // delegate to the A(int) constructor
};</pre></blockquote></li>
+ <li>G++ now fully implements C++11 atomic classes rather than just integer
+ derived classes.
+ <blockquote><pre>
+ class POD {
+ int a;
+ int b;
+ };
+ std::atomic<POD> my_atomic_POD;
+ </pre></blockquote></li>
+
<li>G++ now sets the predefined macro <code>__cplusplus</code> to the
correct value, <code>199711L</code> for C++98/03,
and <code>201103L</code> for C++11.
