Synopsis

int8x4 __qsub8(int8x4 val1,
               int8x4 val2);

Description

__qsub8 inserts a QSUB8 instruction. __qsub8 returns the 8-bit signed saturated 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.