[wwwdocs] gcc-8/changes.html additions
Martin Sebor
msebor@gmail.com
Wed Apr 4 15:57:00 GMT 2018
On 04/04/2018 01:43 AM, Jakub Jelinek wrote:
> Hi!
>
> Following patch documents store merging improvements, -fsanitize=builtin,
> -fsanitize=pointer-overflow and C++2A progress.
>
> Ok for wwwdocs?
>
> --- changes.html 3 Apr 2018 06:52:04 -0000 1.51
> +++ changes.html 4 Apr 2018 07:41:06 -0000
> @@ -113,6 +113,21 @@ a work-in-progress.</h2>
> possible for the user to have a finer-grained control over the loop
> unrolling optimization.
> </li>
> + <li>
> + The store merging pass has been enhanced to handle bitfields and not
Just a minor nit: I believe the established spelling is bit-fields
(as you used in the last hunk below).
Martin
> + just constant stores, but also data copying from adjacent memory
> + locations into other adjacent memory locations, including bitwise
> + logical operations on the data. The pass can also handle byte swapping
> + into memory locations.
> + </li>
> + <li>
> + The undefined behavior sanitizer gained two new options included in
> + <code>-fsanitize=undefined</code>: <code>-fsanitize=builtin</code> which
> + diagnoses at runtime invalid arguments to <code>__builtin_clz</code> or
> + <code>__builtin_ctz</code> prefixed builtins, and
> + <code>-fsanitize=pointer-overflow</code> which performs cheap runtime
> + tests for pointer wrapping.
> + </li>
> </ul>
>
>
> @@ -187,7 +202,17 @@ a work-in-progress.</h2>
>
> <h3 id="cxx">C++</h3>
> <ul>
> - <li></li>
> + <li>
> + The C++ front end has experimental support for some of the upcoming C++2a
> + draft features with the <code>-std=c++2a</code> or <code>-std=gnu++2a</code>
> + flags, including designated initializers, default member initializers for
> + bit-fields, <code>__VA_OPT__</code> (except that
> + <code>#__VA_OPT__</code> is unsupported), lambda <code>[=, this]</code>
> + captures, etc.
> + For a full list of new features,
> + see <a href="https://gcc.gnu.org/projects/cxx-status.html#cxx2a">the C++
> + status page</a>.
> + </li>
> </ul>
>
> <h3 id="fortran">Fortran</h3>
>
> Jakub
>
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