C++ to VB code help, bit shifting

[Geespot]

Hi

Im converting some c++ code to vb ( basically i dont know c++ well enough to do it in c++ )

and ive come to this line

x = (x<<13) ^ x;

where x is a 32bit integer ( long in vb )

Does anybody know how to convert this into a vb statement?

Thanks.

[Zaei]

Dim x As Long
x = (x * 26) Xor x

Should be correct.

Z.

[twanvl]

A bit shift should be translated as *2^n, but that is really slow. If the shift is fixed you can calculate it first:

x = (x * 8192) Xor x 'x = (x<<13) ^ x;

[Zaei]

Originally posted by twanvl
A bit shift should be translated as *2^n, but that is really slow. If the shift is fixed you can calculate it first:

x = (x * 8192) Xor x 'x = (x<<13) ^ x;

Duh, what was I thinking? -.-;;

Z.

[CornedBee]

Still far slower than a shift, but that cannot be helped. VB simply doesn't know shifts.

[Zaffir]

Makes me glad that almost every C/C++ compiler out there automatically interprets that kinda stuff as a shift - even if you code it as multiplication.

[kedaman]

makes me sick. They didn't include shifts in VB because they thought programmers shouldn't be concerned with lowlevel issues, and I agree with them, we'd all be stuck with machine code otherways. A programming language should be abstract and independent of the machine.