himada-dispatch 0.1.0

Adaptive SIMD dispatch for Himada — auto-selects fastest kernel at runtime
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fn main() {
    // Declare all possible build-time cfgs so the compiler doesn't warn.
    for cfg in [
        "himada_force_scalar",
        "himada_force_sse",
        "himada_force_avx2",
        "himada_force_neon",
    ] {
        println!("cargo:rustc-check-cfg=cfg({})", cfg);
    }

    // Build-time dispatch: emit cfg flags for forced SIMD ISAs.
    // These are used to conditionally compile only the requested kernels.
    for (feat, cfg) in [
        ("force-scalar", "himada_force_scalar"),
        ("force-sse", "himada_force_sse"),
        ("force-avx2", "himada_force_avx2"),
        ("force-neon", "himada_force_neon"),
    ] {
        let key = format!(
            "CARGO_FEATURE_{}",
            feat.to_uppercase().replace('-', "_")
        );
        if std::env::var(key).is_ok() {
            println!("cargo:rustc-cfg={}", cfg);
        }
    }
}