[Bug c++/84816] [7.2.0/8.0.1 x86_64] Incorrect code generation if signed overflow

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84816

--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Dmitry Lesnikov from comment #4)
> (In reply to Andrew Pinski from comment #1)
> > signed overflow is undefined behavior at runtime.
> 
> for(int i=0; i<10; i++)
> 
> this loop is correct.

But there is an overflow with the variable a when i is 6.