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Ball In A Box Productions
; *** Count the number of bits in DWORD bitCount proc STDCALL num:DWORD sub eax,eax ; clear a bit counter mov ecx,eax ; zero add ecx,num ; add the number to be bit counted je noBits ; jump and exit if no bits bitLp: inc eax ; count one bit mov ebx,ecx ; get number to bit count dec ebx ; invert all LSB's and ecx,ebx ; clear all the inverted bits jne bitLp ; loop if more bits noBits: ret ; return with bit count in eax bitCount endppseudocode
while number > 0
count = count + 1
number = ( number -1 ) and number
end while
count = count + 1
number = ( number -1 ) and number
end while
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