[Bug c++/64490] incorrect -O2 and -O3 optimization of the slightly different template functions

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64490

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |INVALID

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Anton Skidin from comment #0)
> Of course, there is an integer overflow in the code and theoretically its
> behaviour could depend on the hardware it is executed on.
> However, the compiler should at least produce the same results for the same
> command line argument and for the equivalent parts of the code.

No, the code has undefined behaviour so anything can happen, you are wrong to
expect the same results.