Synopsis

int __smlabb(int16x2 val1,
             int16x2 val2,
             int val3);

Description

__smlabb inserts a SMLABB instruction. __smlabb returns the equivalent of

• res = val1[0] * val2[0] + val3
  
  where [0] is the lower 16 bits and [1] is the upper 16 bits. This operation sets the Q flag if overflow occurs on the addition.