Synopsis

int16x2 __sxtb16(int8x4 val);

Description

__sxtb16 inserts a SXTB16 instruction. __sxtb16 returns the 16-bit signed equivalent of

• res[0] = (short)val[0]
• res[1] = (short)val[2]
  
  where res[0] is the lower 16 bits, res[1] is the upper 16 bits, val[0] is the lower 8 bits and val[2] is the 8 bits starting at bit position 16.