Messages in this thread |  | | Date | Mon, 7 May 2001 21:02:29 +0200 | From | "J . A . Magallon" <> | Subject | Re: page_launder() bug |
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On 05.07 Helge Hafting wrote: > Tobias Ringstrom wrote: > > > > On Sun, 6 May 2001, David S. Miller wrote: > > > It is the most straightforward way to make a '1' or '0' > > > integer from the NULL state of a pointer. > > > > But is it really specified in the C "standards" to be exctly zero or one, > > and not zero and non-zero? > > !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.
-- J.A. Magallon # Let the source be with you... mailto:jamagallon@able.es Linux Mandrake release 8.1 (Cooker) for i586 Linux werewolf 2.4.4-ac5 #1 SMP Sat May 5 01:17:07 CEST 2001 i686
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