Function getHalfNegative11

src/backend/oneapi/kernel/random_engine_write.hpp:90–97

Generates rationals in (-1, 1]

// Generates rationals in (-1, 1]
sycl::half getHalfNegative11(uint num, uint index) {
    sycl::half v = static_cast<sycl::half>(min(MAX_INT_BEFORE_INFINITY,
                       static_cast<ushort>(num >> (16U * (index & 1U)) & 0x0000ffff)));

    const sycl::half signed_half_factor{3.05e-5}; // (1 / (SHRT_MAX + 1))
    const sycl::half signed_half_half_factor{1.526e-5}; // (0.5 * signed_half_factor)
    return sycl::fma(v, signed_half_factor, signed_half_half_factor);
}

namespace {
template<typename T>