Function vbslq_s64 

pub fn vbslq_s64(a: uint64x2_t, b: int64x2_t, c: int64x2_t) -> int64x2_t

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

Bitwise Select. Arm’s documentation