I've committed this patch to add release notes for the _FloatN, _FloatNx support.
Index: gcc-7/changes.html =================================================================== RCS file: /cvs/gcc/wwwdocs/htdocs/gcc-7/changes.html,v retrieving revision 1.9 diff -u -r1.9 changes.html --- gcc-7/changes.html 26 Aug 2016 10:04:15 -0000 1.9 +++ gcc-7/changes.html 26 Aug 2016 12:06:51 -0000 @@ -111,11 +111,40 @@ </ul> <h3 id="c">C</h3> -<!-- <ul> - <li></li> + <li><p>The C front end now supports type + names <code>_Float<i>N</i></code> for floating-point types with IEEE + interchange formats and <code>_Float<i>N</i>x</code> for + floating-point types with IEEE extended formats. These type names + come from ISO/IEC TS 18661-3:2015.</p> + <p>The set of types supported depends on the target for which GCC is + configured. Most targets + support <code>_Float32</code>, <code>_Float32x</code> + and <code>_Float64</code>. <code>_Float128</code> is supported on + targets where IEEE binary128 encoding was already supported + as <code>long double</code> + or <code>__float128</code>. <code>_Float64x</code> is supported on + targets where a type with either binary128 or Intel extended + precision format is available.</p> + <p>Constants with these types are supported using + suffixes <code>f<i>N</i></code>, <code>F<i>N</i></code>, + <code>f<i>N</i>x</code> and <code>F<i>N</i>x</code> + (e.g., <code>1.2f128</code> or <code>2.3F64x</code>). Macros such + as <code>FLT128_MAX</code> are defined + in <code><float.h></code> + if <code>__STDC_WANT_IEC_60559_TYPES_EXT__</code> is defined before + it is included.</p> + <p>These new types are always distinct from each other and + from <code>float</code>, <code>double</code> and <code>long + double</code>, even if they have the same encoding. Complex types + such as <code>_Complex _Float128</code> are also supported.</p> + <p>Type-generic built-in functions such + as <code>__builtin_isinf</code> support the new types, and the + following type-specific built-in functions have versions + (suffixed <code>f<i>N</i></code> or <code>f<i>N</i>x</code>) for the + new + types: <code>__builtin_copysign</code>, <code>__builtin_fabs</code>, <code>__builtin_huge_val</code>, <code>__builtin_inf</code>, <code>__builtin_nan</code>, <code>__builtin_nans</code>.</p></li> </ul> ---> <h3 id="cxx">C++</h3> <ul> -- Joseph S. Myers jos...@codesourcery.com
