Synopsis

long long __smlsldx(int16x2 val1,
                    int16x2 val2,
                    long long val3);

Description

__smlsldx inserts a SMLSLDX instruction. __smlsldx returns the equivalent of

• res = val1[0] * val2[1] - val1[1] * val2[0] + val3
  
  where [0] is the lower 16 bits and [1] is the upper 16 bits.