[PATCH] Re: New atomics not mentioned in /gcc-4.7/changes.html

[Andrew MacLeod]

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.

Is there no changelog for docs?

Andrew


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*************** mission statement</a>.</p>
*** 53,58 ****
--- 53,68 ----
  
  <dl class="news">
  
+ <dt><span>Atomic memory model support</span>
+     <span class="date">[2011-11-06]</span></dt>
+ <dd>C+11/C11 memory model 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 atomic wiki
+       <a href="http://gcc.gnu.org/wiki/Atomic/GCCMM";>here</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&lt;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.