[Bug middle-end/81954] gcc8 too aggressively reorders memory access beyond condition

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81954

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Or this is a dup of PR81900 which is meanwhile fixed (but not in your version).