hash calculating

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Abyx

Joined: 17 Apr 2008
Posts: 9

Abyx 26 Oct 2008, 09:20

Code:

macro h name {
      virtual at 1
          db `name
          hash= 0
          repeat $-$$
              load C byte from %
              display C,13,10    ;debug
              hash= hash*5+C  ;<<<error here
          end repeat
      end virtual
      dd hash }

h 0123456789abcdefghijklmnopqrstuvxyz_______________________

This code generates compile-time error "value out of range".
If unroll cycle, all the same.

What's wrong?

26 Oct 2008, 09:20

baldr

Joined: 19 Mar 2008
Posts: 1651

baldr 26 Oct 2008, 10:39

Abyx,

hash value grows too big to fit in 64 bits used by fasm for constants.

Code:

h 0123456789abcdefghijklmno

fails on dd hash for the same reason.

26 Oct 2008, 10:39

Abyx

Joined: 17 Apr 2008
Posts: 9

Abyx 26 Oct 2008, 10:43

So "hash= (hash*5+C)and 0xFFFFFFFF"...
thanks, baldr

26 Oct 2008, 10:43

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