Synopsis

int __smusd(int16x2 val1,
            int16x2 val2);

Description

__smusd inserts a SMUSD instruction. __smusd returns the equivalent of

• res = val1[0] * val2[0] - val1[1] * val2[1]
  
  where [0] is the lower 16 bits and [1] is the upper 16 bits.