thakis added a comment.
In https://reviews.llvm.org/D50979#1206211, @rsmith wrote:
> I don't think this is NFC. Testcase:
>
> long long int a, b, c, d;
> unsigned char f() { return _InterlockedCompareExchange128(&(++a), ++b, ++c,
> &(++d)); }
>
>
> Today, Clang increments `a`, `b`, `c`, and `d` twice each in `f()`.
Thanks for pointing this out, good to hear that this even happens to find a bug
:-) I'll add some tests to document the progression.
https://reviews.llvm.org/D50979
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