[Bug middle-end/576] gcc performs invalid optimization with float operations when different rounding mode.

[vincent-gcc at vinc17 dot net via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=576

--- Comment #7 from Vincent Lefèvre <vincent-gcc at vinc17 dot net> ---
(In reply to Andrew Pinski from comment #6)
> That is because the code is GNU C90 and not C++ .

I've used gcc, not g++. But this fails even with -std=gnu90.