Synopsis

uint8x4 __usub8(uint8x4 val1,
                uint8x4 val2);

Description

__usub8 inserts a USUB8 instruction. __usub8 returns the 8-bit unsigned equivalent of

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