Author: Sune Fischer
Date: 14:57:37 07/03/02
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On July 03, 2002 at 17:00:49, Robert Hyatt wrote: >On July 03, 2002 at 16:09:37, Sune Fischer wrote: > >>Hi quick question. >> >>// this one is "faulty": >>#define RANK64(r) (0x00000000000000FF<<(r<<3)) // r is 0-7 >> > >That long number is _not_ a 64 bit value. If you cast the hex constant >to 64 bits, the shift amount doesn't need to be cast (and it might well be >more efficient that way as well). Then it has to be because of the leading zeros, because usually it _is_ a 64 bit number. The same trick on the file worked great, but that number is 0x0101010101010101, which is then correctly read as a 64 bit type. -S.
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