Function vmla_n_s16 

pub fn vmla_n_s16(a: int16x4_t, b: int16x4_t, c: i16) -> int16x4_t

Available on (AArch64 or ARM64EC) and (AArch64 or ARM64EC or target feature v7) and (ARM or AArch64 or ARM64EC) and target feature neon only.

Vector multiply accumulate with scalar Arm’s documentation