https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102989
--- Comment #1 from Alejandro Colomar <colomar.6.4.3 at gmail dot com> --- This also triggers the following wish: 'widthof(t)', which would be equivalent to 'sizeof(t) * CHAR_BIT' for normal types, but would be equal to N in the case of _ExtInt(N). It could also be used to mean the exact bit width of a bitfield. This is helpful to have a generic TYPE_MAX(t) macro (yet another wish, although this would be for glibc once widthof() is in GCC), which could be implemented as: #define ISSIGNED(t) (((t) - 1) < 0) #define __STYPE_MAX(t) (((((t) 1 << widthof(t) - 2)) - 1) << 1) + 1) #define __UTYPE_MAX(t) ((t) -1) #define TYPE_MAX(t) (ISSIGNED(t) ? __STYPE_MAX(t) : __UTYPE_MAX(t)) #define TYPE_MIN(t) ((t) ~TYPE_MAX(t)) These macros could be used for *any* integer type, including _ExtInt() and bitfields, if the compiler provided widthof().
