This intrinsic inserts a UQSAX instruction into the instruction stream generated by the compiler. It enables you to exchange the halfwords of the second operand and perform one unsigned 16-bit integer subtraction and one unsigned 16-bit addition, saturating the results to the 16-bit unsigned integer range 0 ≤ x ≤ 2¹⁶ - 1.

unsigned int __uqsax(unsigned int val1, unsigned int val2)

where:

The __uqsax intrinsic returns:

The results are saturated to the 16-bit unsigned integer range 0 ≤ x ≤ 2¹⁶ - 1.

Example:

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

    res = __uqsax(val1,val2); /* res[15:0] = val1[15:0] + val2[31:16]
                                 res[31:16] = val1[31:16] - val2[15:0]
                               */
    return res;
}