Synopsis

int __smusdx(int16x2 val1,
             int16x2 val2);

Description

__smusdx inserts a SMUSDX instruction. __smusdx returns the equivalent of

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