[Bug tree-optimization/91555] [9.2 regression] Optimizer bug

[skunk at iskunk dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91555

--- Comment #4 from Daniel Richard G. <skunk at iskunk dot org> ---
Yes, that is the case:

    $ gcc -O2 gcc9-opt-bug.c -o bug
    $ ./bug
    WRONG 13
    result: t = 18446744073709551615 (wrong)

    $ gcc -O2 -fwrapv gcc9-opt-bug.c -o bug
    $ ./bug
    result: t = 1009489458 (correct)