This intrinsic inserts an SMLADX instruction into the instruction stream generated by the compiler. It enables you to exchange the halfwords of the second operand, perform two signed 16-bit multiplications, adding both results to a 32-bit accumulate operand. The Q bit is set if the addition overflows. Overflow cannot occur during the multiplications.

unsigned int __smladx(unsigned int val1, unsigned int val2, unsigned int val3)

Where:

The __smladx intrinsic returns the product of each multiplication added to the accumulate value, as a 32-bit integer.

Example:

unsigned int dual_multiply_accumulate(unsigned int val1, unsigned int val2, unsigned int val3)
{
  unsigned int res;

    res = __smladx(val1,val2,val3); /* p1 = val1[15:0] × val2[31:16]
                                       p2 = val1[31:16] × val2[15:0]
                                       res[31:0] = p1 + p2 + val3[31:0]
                                     */
    return res;
}