[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 #6 from Daniel Richard G. <skunk at iskunk dot org> ---
Unfortunately, this GCC build does not have libsanitizer, as it is on an older
(Linux) system without the necessary system headers.

    $ gcc -O2 -fsanitize=undefined gcc9-opt-bug.c -o bug
    /usr/bin/ld: cannot find -lubsan
    collect2: error: ld returned 1 exit status

(I get a similar error on the Solaris system.)

Are you able to reproduce the -O1/-O2 split in behavior?