Arithmetic or logical operation tree computation.

A with a at least one n parallel processing the microprocessor for calculating the operation or a logic operation at least one first and second tree method. The method comprises: a) is n processing element to synchronize parallel to said the first tree n arithmetics or a logic operations of the first iteration the (48), and b) is a on a calculating the processing elements of the first iterative of n processing unit uses, parallel executing the arithmetics or a logic operations on the first iteration's results of (66); and n-m processing element is a used in computer of the second iteration. Instrument and first tree the calculating of the second iteration parallel, the method comprises: Using are used for k processing element for calculating the first tree n-m the processing unit of the second iteration of the parallel, performing second tree arithmetics k or a logic operations of (66).