Synopsis

int8x4 __shadd8(int8x4 val1,
                int8x4 val2);

Description

__shadd8 inserts a SHADD8 instruction. __shadd8 returns the 8-bit signed equivalent of

• res[0] = (val1[0] + val2[0])/2
• res[1] = (val1[1] + val2[1])/2
• res[2] = (val1[2] + val2[2])/2
• res[3] = (val1[3] + val2[3])/2
  
  where [0] is the lower 8 bits and [3] is the upper 8 bits.