Function vpaddl_s32 

pub fn vpaddl_s32(a: int32x2_t) -> int64x1_t

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

Signed Add and Accumulate Long Pairwise. Arm’s documentation