Function vmull_n_s16 

pub fn vmull_n_s16(a: int16x4_t, b: i16) -> int32x4_t

🔬This is a nightly-only experimental API. (stdarch_arm_neon_intrinsics #111800)

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

Vector long multiply with scalar Arm’s documentation