Function vbsl_s64 

pub fn vbsl_s64(a: uint64x1_t, b: int64x1_t, c: int64x1_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.

Bitwise Select. Arm’s documentation