Function vmulq_laneq_f16 

pub fn vmulq_laneq_f16(
    a: float16x8_t,
    b: float16x8_t,
    const LANE: i32,
) -> float16x8_t

Available on target feature fp16 and target feature neon and (AArch64 or ARM64EC) only.

Floating-point multiply Arm’s documentation