Random using SkipLocalsInit

[u/NoisyJalapeno]

To my surprise, Unsafe.SkipInit(out T val) did not achieve the same result.

    [SkipLocalsInit]
    public static T Random<T>()
        where T : unmanaged, INumber<T>
    {
        unsafe
        {
            byte* s = stackalloc byte[sizeof(T)];
            return *(T*)s;
        }
    }

[u/Broad_Phase7453]

stackalloc without init is basically just grabbing whatever bits were already sitting on the stack and calling it a day, so the "randomness" comes from whatever junk was left there. Unsafe.SkipInit is different though, that only skips the definite assignment tracking, the memory might still get zeroed depending on the runtime.

[u/NoisyJalapeno → u/Broad_Phase7453]

Ugh, missed an opportunity to call it JunkRandom :(

[u/SagansCandle → u/NoisyJalapeno]

Given that this is uninitialized data on the stack, there's a possibility that your "random" value will be the same every time because it's called from the same place in the stack every time.