On Mon, 27 Jun 2022, Jakub Jelinek via Gcc-patches wrote: > On Sun, Jun 26, 2022 at 08:45:28PM +0200, Mikael Morin wrote: > > I don’t like the _Float128 vs __float128 business, it’s confusing. > > And accordinog to https://gcc.gnu.org/onlinedocs/gcc/Floating-Types.html > > they seem to be basically the same thing, so it’s also redundant. > > I thought __float128 and _Float128 are distinct and incompatible in the FEs > and equivalent in middle-end and back-end, but apparently they are > considered equivalent even for _Generic.
Yes, when both are supported, they are the same type. The main differences (not relevant for this patch, I think) are: * _Float128 is supported on systems where long double has the IEEE binary128 format (as a distinct type from long double even when they have the same format); __float128 generally isn't supported on such systems. * __float128 is supported in C++, _Float128 isn't (though we've discussed adding support for _FloatN type names and corresponding fN constant suffixes in C++; see the thread on the gcc list in March 2021). -- Joseph S. Myers jos...@codesourcery.com
