After recent SYCL-CTS change, we've noticed that here we're calling sycl::vec::as<bool> for different sycl::vec<T>, where T is char, int, float and so on, like:

auto inputVec = sycl::vec<char, 8>(0, 1, 2, 3, 4, 5, 6, 7);
auto asVec = inputVec.as<sycl::vec<bool, 8>>();

Looks like it's not legal. SYCL2020 defines template <typename asT> asT as() const method as:

Bitwise reinterprets this SYCL vec as a SYCL vec of a different element type and number of elements specified by asT. The new SYCL vec type must have the same storage size in bytes as this SYCL vec.

According to https://en.cppreference.com/w/cpp/numeric/bit_cast:
If there is no value of type To corresponding to the value representation produced, the behavior is undefined.

So, it looks like as<bool> should be prohibited as it's UB.