[Bug rtl-optimization/69570] [6 Regression] if-conversion bug on i?86

[bernds at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69570

--- Comment #13 from Bernd Schmidt <bernds at gcc dot gnu.org> ---
Or, you know, operate on integers. Skip the / 255.0 step where it is
unnecessary.