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

[glisse at gcc dot gnu.org]

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

--- Comment #15 from Marc Glisse <glisse at gcc dot gnu.org> ---
(In reply to rguenther@suse.de from comment #13)
> Anyone have a patch to rnflow that I can apply to the tester(s) to fix
> the issue?

It is easy enough to create a jsee_long of type integer(kind=8) and do the
multiplication and addition on it, but we are missing the narrowing pass to
turn (int32_t)((int64_t)x*cst+cst) back into an operation on uint32_t, so that
would pessimize the code.