Re: [PATCH] mask ADT: bitmap and bitop tweaks [1/22]

From: Chris Friesen
Date: Tue Mar 30 2004 - 10:56:18 EST

William Lee Irwin III wrote:
On Mon, Mar 29, 2004 at 03:06:16PM -0800, Matthew Dobson wrote:
If we're
not assuming the unused bits are 0's, then we need to do this last word
special casing in bitmap_xor & bitmap_andnot, because they could set the
unused bits. Or am I confused?

No, not those two. xor of 0's is 0 again. and of 0 and anything is 0 again.

Huh? Xor of 0 and 1 is 1.

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