[Bug tree-optimization/71026] Missing division optimizations

[wdijkstr at arm dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71026

--- Comment #3 from Wilco <wdijkstr at arm dot com> ---
(In reply to ktkachov from comment #2)
> The transforms
> 
> int f4(float x) { return (1.0f / x) < 0.0f; }         // -> x < 0.0f
> int f5(float x) { return (x / 2.0f) <= 0.0f; }        // -> x <= 0.0f
> 
> can be done as match.pd patterns, no?

Note f5 is already transformed to (x * 0.5f) <= 0.0f even with -O2. The more
general form for that one is (X * C0) <= C1 -> X <= C1/C0.