Negative zero on Cyber 170's.

[kjm at ut-ngp.UUCP]

[]
>    Try evaluating (unsigned) -1 on a one's complement machine!  A word
>containing all ones in such a machine (e.g. CDC Cyber machines) is 
>taken to be "negative zero", which is really an illegal representation.
>
>[Ben Mejia]

Nonsense.  Negative zero is a perfectly good number on Cybers, and,
I suspect, on any other 1's complement machine.  It is not an illegal
operand, although it can behave in subtly different ways than positive
zero.

--
The above viewpoints are mine.  They are unrelated to
those of anyone else, including my cat and my employer.

Kenneth J. Montgomery  "Shredder-of-hapless-smurfs"
kjm at ngp.{ARPA, UTEXAS.EDU, CC.UTEXAS.EDU}  [Old, New, and Very New Internet]
Coming soon: ccaj001 at dinosaur.CC.UTEXAS.EDU  [Dual Cyber 170]