//! Common utilities for CRC computation.
//!
//! This module provides:
//! - Bitwise reference implementations for correctness verification
//! - Portable slice-by-N implementations for all CRC widths
//! - Const-fn lookup table generation for all CRC sizes
//! - GF(2) matrix operations for `combine()` implementation
//! - Generic kernel selection and dispatch infrastructure
//! - Generic test harnesses for CRC property testing
//! - PCLMULQDQ/PMULL folding constants for hardware acceleration
//! - Software prefetch helpers for optimal memory access patterns
// CLMUL folding constants and helpers (used by SIMD CRC backends).