Function svqdmlslb_lane_s64 

pub fn svqdmlslb_lane_s64<const IMM_INDEX: i32>(
    op1: svint64_t,
    op2: svint32_t,
    op3: svint32_t,
) -> svint64_t

🔬This is a nightly-only experimental API. (stdarch_aarch64_sve #145052)

Available on (AArch64 or ARM64EC) and target feature sve and target feature sve2 only.

Saturating doubling multiply-subtract long (bottom) Arm’s documentation