[Bug c++/97433] New: C++20 Coroutines, Unexpected reordering of await_resume, return_value and yield_value

[davidledger at live dot com.au]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97433

            Bug ID: 97433
           Summary: C++20 Coroutines, Unexpected reordering of
                    await_resume, return_value and yield_value
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: davidledger at live dot com.au
  Target Milestone: ---

Critical components of c++20 coroutines are being reordered. This means that
for Task types that return values using co_return and co_yield there is likely
incorrect results.

LLVM does not have this issue.
MSVC behaves the same as GCC.

I've outlined this problem in detail here:
https://stackoverflow.com/questions/64348125/c20-coroutines-unexpected-reordering-of-await-resume-return-value-and-yield

The problem can be seen here, but the explaination is in the stack overflow
post:
https://godbolt.org/z/7rn5jz

(It let me format the post nicely)