[Bug tree-optimization/81245] [8 Regression] ICE building calculix with -Ofast

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81245

--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
Not sure if it's good to introduce copysign here anyway (do we actually
vectorize this w/o target support?)