On Fri, Apr 22, 2016 at 11:26:11AM +0200, Thomas Schwinge wrote: > Index: htdocs/gcc-6/changes.html > =================================================================== > RCS file: /cvs/gcc/wwwdocs/htdocs/gcc-6/changes.html,v > retrieving revision 1.75 > diff -u -p -r1.75 changes.html
LGTM. > --- htdocs/gcc-6/changes.html 21 Apr 2016 15:57:43 -0000 1.75 > +++ htdocs/gcc-6/changes.html 22 Apr 2016 09:22:19 -0000 > @@ -124,6 +124,52 @@ For more information, see the > <!-- .................................................................. --> > <h2 id="languages">New Languages and Language specific improvements</h2> > > +<!-- <ul> > + <li> -->Compared to GCC 5, the GCC 6 release series includes a much > improved > + implementation of the <a href="http://www.openacc.org/";>OpenACC 2.0a > + specification</a>. Highlights are: > + <ul> > + <li>In addition to single-threaded host-fallback execution, offloading > is > + supported for nvptx (Nvidia GPUs) on x86_64 and PowerPC 64-bit > + little-endian GNU/Linux host systems. For nvptx offloading, with the > + OpenACC parallel construct, the execution model allows for an arbitrary > + number of gangs, up to 32 workers, and 32 vectors.</li> > + <li>Initial support for parallelized execution of OpenACC kernels > + constructs: > + <ul> > + <li>Parallelization of a kernels region is switched on > + by <code>-fopenacc</code> combined with <code>-O2</code> or > + higher.</li> > + <li>Code is offloaded onto multiple gangs, but executes with just one > + worker, and a vector length of 1.</li> > + <li>Directives inside a kernels region are not supported.</li> > + <li>Loops with reductions can be parallelized.</li> > + <li>Only kernels regions with one loop nest are parallelized.</li> > + <li>Only the outer-most loop of a loop nest can be parallelized.</li> > + <li>Loop nests containing sibling loops are not parallelized.</li> > + </ul> > + Typically, using the OpenACC parallel construct gives much better > + performance, compared to the initial support of the OpenACC kernels > + construct. > + <li>The <code>device_type</code> clause is not supported. > + The <code>bind</code> and <code>nohost</code> clauses are not > + supported. The <code>host_data</code> directive is not supported in > + Fortran.</li> > + <li>Nested parallelism (cf. CUDA dynamic parallelism) is not > + supported.</li> > + <li>Usage of OpenACC constructs inside multithreaded contexts (such as > + created by OpenMP, or pthread programming) is not supported.</li> > + <li>If a call to the <code>acc_on_device</code> function has a > + compile-time constant argument, the function call evaluates to a > + compile-time constant value only for C and C++ but not for > + Fortran.</li> > + </ul> > + See the <a href="https://gcc.gnu.org/wiki/OpenACC";>OpenACC</a> > + and <a href="https://gcc.gnu.org/wiki/Offloading";>Offloading</a> wiki > pages > + for further information. > + <!-- </li> > +</ul> --> > + > <!-- <h3 id="ada">Ada</h3> --> > > <h3 id="c-family">C family</h3> Jakub
