[Cfp-interest 2054] Re: Subnormals

[Steve (Numerics) Canon]

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
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.oakapple.net/pipermail/cfp-interest/attachments/20210706/0b09ed14/attachment.htm>