Synopsis

unsigned __rev16(unsigned val);

Description

__rev16 inserts a REV16 instruction. __rev16 returns the equivalent of

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