checkasm helper for rust

It is a port of the dav1d checkasm harness to rust.

Usage

#[cfg(test)]
mod test {
    use checkasm::declare_fn;
    use std::ffi::c_void;

    extern fn variant_avx2(a: *mut u8, len: usize);
    extern fn variant_avx512(a: *mut u8, len: usize);

    declare_fn { check_variant(a: *mut u8, len: usize) };

    #[test]
    fn variant() {
        let mut buf = vec![0u8; 128];

        check_variant(variant_avx512 as *mut c_void, buf.as_mut_ptr(), buf.len());
    }
}

Status

• builds
• reports errors on stderr
• panics correctly