[Bug middle-end/82004] [8 Regression] SPEC CPU2017 628.pop2_s miscompare

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82004

--- Comment #37 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 43771
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43771&action=edit
gcc8-pr82004.patch

Untested hack.  With this it works even with -flto.  Though, the rounding
errors because we do 400 multiplications get perhaps way too high even for
-Ofast (the benchmark doesn't care that much except for the first iteration,
but I think it is too much).  So, as an alternative I'll just try to something
different.