>> NULL is not guaranteed to be the stored as zeros

> Is that a real issue, though?

Of course, it's not, but that's one of those factoids that everyone learns at some point and feels like needing to rub it into everyone else's face assuming that these poor schmucks are as oblivious to it as they once were. A circle of life and all that.

Forgive me for encouraging the adoption of portable, compliant code to those who may not otherwise be aware of it. If you want to assume all the world’s an x86 that’s great but you should at least know what part of your code is going to be wrong elsewhere.

AMD GPUs use a non-zero NULL pointer[0].

[0] https://reviews.llvm.org/D26196

Interesting. And it isn't even always non-zero; sometimes it's 32-bit -1, sometimes it's 32-bit 0 and sometimes it's 64-bit 0:

https://llvm.org/docs/AMDGPUUsage.html#address-spaces