[Bug middle-end/81376] unnecessary cast before comparison

[glisse at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81376

--- Comment #1 from Marc Glisse <glisse at gcc dot gnu.org> ---
Good timing, Yuri Gribov is working on PR57371 (the case where one side is a
constant), he might be interested.