This intrinsic inserts an SMUSDX instruction into the instruction stream generated by the compiler. It enables you to perform two 16-bit signed multiplications, subtracting one of the products from the other. The halfwords of the second operand are exchanged before performing the arithmetic. This produces top × bottom and bottom × top multiplication.

unsigned int__smusdx(unsigned int val1, unsigned int val2)

Where:

The __smusdx intrinsic returns the difference of the products of the two 16-bit signed multiplications.

Example:

unsigned int dual_multiply_prods(unsigned int val1, unsigned int val2)
{
  unsigned int res;

    res = __smuad(val1,val2); /* p1 = val1[15:0] × val2[31:16]
                                 p2 = val1[31:16] × val2[15:0]
                                 res[31:0] = p1 - p2
                               */
    return res;
}