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Return the position of the leftmost set bit in a 64bit value
Source position: systemh.inc line 1121
function BsrQWord( 
const AValue: QWord 
):Cardinal; 
BsfQWord scans the QWord AValue, starting at the leftmost position and working towards position 0, and returns the index of the first set bit. The position is measured from the 0th, rightmost bit.
When the input is 0, the result is 255 (unsigned equivalent of 1).

Return the position of the rightmost set bit in an 8bit value 


Return the position of the rightmost set bit in a 16bit value 


Return the position of the rightmost set bit in a 32bit value 


Return the position of the leftmost set bit in a 64bit value 