[Bug target/86828] [7 Regression] wrong-code bug with "-march=knl -Ofast" (invalid memory reference)

[ubizjak at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86828

--- Comment #10 from Uroš Bizjak <ubizjak at gmail dot com> ---
(In reply to janus from comment #9)
> (In reply to Richard Biener from comment #8)
> > More details are needed here.
> 
> What exactly do you need?

Can you try with valgrind?