Hi,
I'm trying to understand what goes on in "lib\system\atomics.nim". This is in
part because I'm missing atomicLoadN/atomicStoreN on Windows, and I'm trying to
work out how to implement that myself. I've just stumbled upon this declaration
(atomics.nim, line #220):
interlockedCompareExchange8(p: pointer; exchange, comparand: byte): byte
{.importc: "_InterlockedCompareExchange64", header: "<intrin.h>".}
At first, I though using __InterlockedCompareExchange64_ was a bug, but then I
found out that there is no __InterlockedCompareExchange8_.
So, I guess _exchange_ and _comparand_ get cast to __int64_, and the return
value just gets cast to _byte_. So far so good.
But __InterlockedCompareExchange64_ assumes _p_ points to a __int64_ value, and
so will overwrite the _8 bytes_ at that location.
How can that not go horribly wrong?
