Function svext_f64 

pub fn svext_f64<const IMM3: i32>(
    op1: svfloat64_t,
    op2: svfloat64_t,
) -> svfloat64_t

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

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

Extract vector from pair of vectors Arm’s documentation