Subject: Re: True 64bit OS ?
To: Jonathan Stone <>
From: Ted Lemon <>
List: current-users
Date: 07/07/1997 14:56:58
> Err, NT on Alpha is limited to 32-bit addressing.  It does use 64-bit
> registers, though.

Right, and IMHO that's what's most important to the average person.
Granted, Jason's group probably cares about having a 64-bit virtual address
space, but the average person can't afford to care about that.

> The FPU has a mode bit that says whether FPU registers are 32 or 64
> bits.  IEEE doubles always use 64 bits, but in 32-bit mode they use a
> register pair.  64-bit FPU mode can be turned on even when the integer
> CPU is used in 32-bit mode, and GCC has an option to generate code
> that uses this feature.

(grin) I know - I put it in, for NCD...