# [−][src]Function core::intrinsics::prefetch_read_data

    pub unsafe extern "rust-intrinsic" fn prefetch_read_data<T>(
        data: *const T,
        locality: i32
    )

🔬 This is a nightly-only experimental API. (`core_intrinsics`)

intrinsics are unlikely to ever be stabilized, instead they should be used through stabilized interfaces in the rest of the standard library

The `prefetch` intrinsic is a hint to the code generator to insert a prefetch instruction if supported; otherwise, it is a no-op. Prefetches have no effect on the behavior of the program but can change its performance characteristics.

The `locality` argument must be a constant integer and is a temporal locality specifier ranging from (0) - no locality, to (3) - extremely local keep in cache.

This intrinsic does not have a stable counterpart.