[Bug rtl-optimization/99930] Failure to optimize floating point -abs(x) in nontrivial code at -O2/3

[segher at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99930

--- Comment #8 from Segher Boessenkool <segher at gcc dot gnu.org> ---
That patch is no good.  The combination is not allowed because it is not
known what the "use"s are *for*.  Checking if something is from the constant
pools is not enough at all.