[Cfp-interest 2055] Re: Subnormals

[David Chen]

Thanks!

On Tue, Jul 6, 2021 at 10:30 AM Steve (Numerics) Canon <scanon at apple.com>
wrote:

> On Jul 6, 2021, at 1:24 PM, David Chen <dave.h.chen at gmail.com> wrote:
>
> The effects of the FZ bit in the ARM FPCR are defined by the FPUnpack()
> and FPRound() operations in ARM’s pseudocode documentation. If the encoded
> exponent of an input is zero and fpcr.FZ is 1, then the unpacked input
> value is zero. If a result is tiny and fpcr.FZ is 1, then the result is
> zero.
>
>
> How about the sign bit?  Does fpcr.FZ affect the sign bit in these cases?
>
>
> The sign bit is defined to be preserved by both FPUnpack( ) and FPRound(
> ), regardless of the value of fpcr.FZ.
>
> – Steve
>


-- 
Best Regards,
David.

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