You copied the Doc URL to your clipboard.

__smusdx intrinsic

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)



holds the first halfword operands for each multiplication


holds the second halfword operands for each multiplication.

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


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;

See also