Synopsis

int16x2 __shasx(int16x2 val1,
                int16x2 val2);

Description

__shasx inserts a SHASX instruction. __shasx returns the 16-bit signed equivalent of

• res[0] = (val1[0] - val2[1])/2
• res[1] = (val1[1] + val2[0])/2
  
  where [0] is the lower 16 bits and [1] is the upper 16 bits.