is real an 80-bit type or not?

[Anders F Björklund]

Bill Baxter wrote:

> I read somewhere (won't say where ;-)) that someone is annoyed by D 
> "pretending that "real" is an 80-bit type".  Is it not?  real.sizeof 
> sure seems to return 10 for me.

It's an 80-bit type on all (make that "both") DMD platforms...
It varies on the platforms and architectures that GDC supports.

"int" is a fixed 32-bit type, everywhere. "real" varies in size.
It's 80-bit on Intel, 64 bits on PowerPC and 128 bits on SPARC ?

It's defined as the "largest hardware implemented" float type.
Basically since it maps directly onto the "long double" C type.

--anders

PS. real.sizeof varies between Intel too, due to padding.
     But it should be the same x87 format of the registers.

     GDC manual says: "On Win32, GDC allocates 12 bytes for
     the real type, while DMD allocates 10 bytes."