Function vqrdmlshh_laneq_s16 

pub fn vqrdmlshh_laneq_s16(a: i16, b: i16, c: int16x8_t, const LANE: i32) -> i16

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

Signed saturating rounding doubling multiply subtract returning high half Arm’s documentation