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"Floating point numbers may generally be either 32 bits long (C "float"
type), or 64 bits long (C "double" type). However, in order to reduce
round-off errors, the FPU stack registers are all 80 bits wide."

The 80-bit wide FPU stack registers are long double.

On Fri, 2009-03-06 at 09:57 -0500, Javier Guerra wrote:
> On Fri, Mar 6, 2009 at 9:43 AM, Gabríel A. Pétursson <> wrote:
> > The x86_64 and x86 do support long doubles in hardware. Other
> > architectures do not.
> [citation requested]
> :-)