[Bug rtl-optimization/63375] [4.8/4.9/5 Regression] reordering of reads across fences

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63375

--- Comment #14 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
How is that observable (other than looking at the assembly)?
val1 is an automatic variable whose address doesn't escape to other threads,
and isn't volatile either.  Why do you care?