Re: 64-bit and N32 kernel interfaces

[Ralf Baechle <ralf@linux-mips.org>]

On Thu, Sep 05, 2002 at 05:10:51PM +0200, Maciej W. Rozycki wrote:

> > No - the point is that all data types have the same size in N32.  It
> > was created explicitly as a transitional sop for people who didn't want
> > to fix their code, but wanted a performance increase from their 64-bit
> > hardware.
> 
>  Well, what's the performance increase of n32 over o32?  The increased
> number of argument registers?  I doubt it's noticeable in most cases.

That's a minor optimization.  More important is the availability of
MIPS III/IV and MIPS64 instruction sets which means 64-bit integer registers
and 32 64-bit double precission fp registers.

  Ralf