Subject: Re: Problem and fix for systat/top/ps
To: der Mouse <mouse@Rodents.Montreal.QC.CA>
From: Johnny Billquist <bqt@softjar.se>
List: port-vax
Date: 03/14/2007 17:06:52
der Mouse wrote:
>>Having looked a bit more, I'd say yes. Also, the encode functions
>>don't code NaNs the way DEC is saying either.
>
>>I wonder if they have chosen another representation of NaN on a VAX?
>>They seem to code a NaN the same way they code an INF, which don't
>>even exist as a representation on the VAX.
>
> Neither do NaNs. VAXen don't have NaNs. The closest things the VAX
> has to IEEE NaNs are reserved operands, which are mostly rather like
> IEEE signaling NaNs. The VAX does not have anything like IEEE quiet
> NaNs or infinities. (I think it doesn't have denormalized numbers,
> either, but I'm less sure of that.)
Hmm, you might be right. How does IEEE units behave when an operation on
a NaN is performed then?
Johnny