[Bug regression/71231] [7 Regression]: 300% runtime increase for rnflow

[ubizjak at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71231

--- Comment #14 from Uroš Bizjak <ubizjak at gmail dot com> ---
(In reply to rguenther@suse.de from comment #13)
> On Tue, 24 May 2016, glisse at gcc dot gnu.org wrote:
> 
> > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71231
> > 
> > --- Comment #12 from Marc Glisse <glisse at gcc dot gnu.org> ---
> > -fwrapv seems to fix it. As far as I can tell, the multiplication is done in 32
> > bits, VRP detects that the numbers are nonnegative, so zeroing the sign bit of
> > the result of the mult+add can be assumed to be a NOP.
> 
> Anyone have a patch to rnflow that I can apply to the tester(s) to fix
> the issue?

BTW: The log file at [1] seems corrupted after "protein" report, it doesn't
report "rnflow" failure at all.

[1] http://gcc.opensuse.org/c++bench/pb11/pb11-performance-latest