[Bug c++/64410] gcc 25% slower than clang 3.5 for adding complex numbers

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64410

--- Comment #10 from Richard Biener <rguenth at gcc dot gnu.org> ---
Improves runtime from 8.3s to 6.5s (~25%).