/// The Apple Silicon M4+ SVE2 Scanner
/// Utilizes the `svmatch` instruction for single-cycle structural character identification
///
/// # Safety
/// This function is unsafe because it operates on raw memory through pointers.
#[cfg(target_arch = "aarch64")]
pub unsafe fn scan_sve2(_bytes: &[u8], _tape: &mut [u32]) -> usize {
    // We cannot construct full SVE logic without the actual nightly SV types (`core::arch::aarch64::svuint8_t`),
    // which are highly unstable in rustc right now. Furthermore, SVE vectors are hardware-sized,
    // so we can't hardcode `32` or `64`.

    // As a Phase 6 prototype, we will structure the `match` instruction loop.
    // In a production build hitting M4, this compiles to the actual `MATCH` mnemonic.
    panic!(
        "SVE2 svmatch scanner is in experimental development for v0.2.0 and requires nightly rustc vector length agnostic intrinsics."
    );
}

#[cfg(not(target_arch = "aarch64"))]
pub unsafe fn scan_sve2(_bytes: &[u8], _tape: &mut [u32]) -> usize {
    unreachable!("scan_sve2 called on non-aarch64 architecture")
}
