This intrinsic inserts an SASX instruction into the instruction stream generated by the compiler. It enables you to exchange the halfwords of the second operand, add the high halfwords and subtract the low halfwords. The GE bits in the APRS are set according to the results.

unsigned int __sasx(unsigned int val1, unsigned int val2)

Where:

The __sasx intrinsic returns:

Each bit in APSR.GE is set or cleared for each byte in the return value, depending on the results of the operation. If res is the return value, then:

Example:

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

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