On Thu, 9 Feb 2023, Jakub Jelinek wrote: > Martin Liska mentioned that porting_to.html doesn't mention > the C++ excess precision changes. Not really sure if porting_to > should document those, but I think changes.html certainly should.
Do you think this is a widely spread issue for existing software? Did it materialize a couple of times building/testing Fedora with GCC 13 snapshots (assuming you have done so as in the past)? > Ok for wwwdocs? Yes, thank you! Two minor suggestions/questions below: > --- a/htdocs/gcc-13/changes.html > +++ b/htdocs/gcc-13/changes.html > + <code>-fexcess-precision=fast</code>. The option affects mainly Here I'd say "mainly affects". > + IA-32/x86-64 where when defaulting to x87 math and in some cases on > + Motorola 68000 <code>float</code> and <code>double</code> expressions > + are evaluated in <code>long double</code> precision and S/390, System > z, > + IBM z Systems where <code>float</code> expressions are evaluated in > + <code>double</code> precision. The "where when" part proved a bit tricky for my brain. :-) I think it is precise, but am wondering whether ...IA-32/x64 using x87 math and in some cases on Motorola 68000, where <code>float</code> and <code>double</code> expressions are evaluated... might work? What do you think? Gerald
