Function vmulx_lane_f16 

pub fn vmulx_lane_f16(
    a: float16x4_t,
    b: float16x4_t,
    const LANE: i32,
) -> float16x4_t

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

Floating-point multiply extended Arm’s documentation