[Bug middle-end/85633] reorders function ignoring fpu exception state

[jtaylor.debian at googlemail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85633

--- Comment #2 from Julian Taylor <jtaylor.debian at googlemail dot com> ---
changing the fpu state does not count as a side effect?
This doesn't seem plausible, this type of code is one the reasons the fpu
exception state exists.
There is a lot of code written with this in mind which worked for decades and
now not anymore. I think that classifies as a regression.