needed // First reduction step ADDS acc0<<32, acc1, acc1 LSR $32, acc0, t0 MUL acc0, const1, t1 UMULH acc0, const1, acc0 ADCS t0, acc2 ADCS t1, acc3 ADC $0, acc0 // Second reduction step ADDS acc1<<32, acc2, acc2 LSR $32, acc1, t0 MUL acc1, const1, t1 UMULH acc1, const1, acc1 ADCS t0, acc3 ADCS t1, acc0 ADC $0, acc1 // Third reduction step ADDS acc2<<32, acc3, acc3 LSR $32, acc2, t0 MUL acc2, const1, t1 UMULH acc2, const1, acc2 ADCS t0, acc0 ADCS t1, acc1 ADC $0, acc2 // Last reduction step ADDS acc3<<32,...