# Function prefetch_write_data

Source

    pub unsafe fn prefetch_write_data<T>(data: *const T, locality: i32)

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

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.