[ECOS] Re: Ecos Port to PPC509/PPC555
Jonathan Larmour
jlarmour@cygnus.co.uk
Tue Sep 28 08:02:00 GMT 1999
Bart Veer wrote:
>
> >>>>> "Jifl" == Jonathan Larmour <jlarmour@cygnus.co.uk> writes:
> Jifl> But you can't rely on FP exceptions being generated - they
> Jifl> don't for normal code, so I don't believe this is a viable
> Jifl> option unless I've misunderstood you.
>
> On some architectures including the PPC (if I remember correctly), it
> is possible to disable the floating point unit. The first operation
> that attempts to access the floating point unit, even if it is just to
> access a floating point register, will cause a hardware exception.
> This is separate from normal floating point exceptions such as
> overflow.
Oops yes. I did misunderstand you :-). For what its worth, MIPS and x86 have
this as well IIRC.
Jifl
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