On Wed, Aug 26, 2015 at 8:22 AM, Jonathan Wakely <jwakely.gcc@xxxxxxxxx> wrote: > On 26 August 2015 at 12:04, Kostas Savvidis wrote: >> The online documentation contains the attached passage as part of the "C-Extensions” chapter. There are no actual machines which have an " integer mode wide enough to hold 128 bits” as the document puts it. > > It's not talking about machine integers, it's talking about GCC > integer modes. Several targets support that. > >> This would be a harmless confusion if it didn’t go on to say “… long long integer less than 128 bits wide” (???!!!) Whereas in reality "long long int” is 64 bits everywhere i have seen. > > > Read it more carefully, it says you can't express an integer constant > of type __int128 on such platforms. Is there a way to detect the presence or availability of __int128 via preprocessor macros? Jeff
