tmp3 = (signed long) tmp1 * (signed long) tmp2;
This instruction multiplies the lower-order 16 bits of src by the lower-order 16 bits of src2, and stores the result in the accumulator (ACC). When the result is stored, the least significant bit of the result corresponds to bit 16 of ACC, and the section corresponding to bits 63 to 48 of ACC is sign-extended. Moreover, bits 15 to 0 of ACC are cleared to 0. The lower-order 16 bits of src and the lower-order 16 bits of src2 are treated as signed integers. |