Messages in this thread |  | | | Subject | Re: [PATCH] Fix CPU bitmask truncation | | From | Andreas Schwab <> | | Date | Fri, 20 Dec 2002 21:00:23 +0100 |
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Jeremy Fitzhardinge <jeremy@goop.org> writes:
|> On Fri, 2002-12-20 at 04:17, Andreas Schwab wrote: |> > This is useless. Assigning -1 to any unsigned type is garanteed to give |> > you all bits one, and with two's complement this also holds for any signed |> > type. |> |> Only if the -1 is the same size as the unsigned type. Otherwise it will |> be 0-extended.
Wrong. Unsigned arithmetics is defined as modulo MAX+1, and -1 equals MAX modulo MAX+1 for every MAX.
Andreas.
-- Andreas Schwab, SuSE Labs, schwab@suse.de SuSE Linux AG, Deutschherrnstr. 15-19, D-90429 Nürnberg Key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5 "And now for something completely different." - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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