This intrinsic inserts an SSUB16 instruction into the instruction stream generated by the compiler. It enables you to perform two 16-bit signed integer subtractions.

The GE bits in the APSR are set according to the results.

unsigned int __ssub16(unsigned int val1, unsigned int val2)

Where:

The __ssub16 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 subtract halfwords(unsigned int val1, unsigned int val2)
{
  unsigned int res;

    res = __ssub16(val1,val2); /* res[15:0] = val1[15:0] - val2[15:0]
                                  res[31:16] = val1[31:16] - val2[31:16]
                                */
    return res;
}