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SubjectRe: page_launder() bug

On Mon, 7 May 2001, J . A . Magallon wrote:

>
> On 05.07 Helge Hafting wrote:
> >
> > !0 is 1. !(anything else) is 0. It is zero and one, not
> > zero and "non-zero". So a !! construction gives zero if you have
> > zero, and one if you had anything else. There's no doubt about it.
> > >
>
> Isn't this asking for trouble with the optimizer ? It could kill both
> !!. Using that is like trusting on a certain struct padding-alignment.
>

It isn't, or rather it can't. Because !!x is not x unless x is one or
zero.

Anuradha

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