https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71034
--- Comment #2 from Marc Glisse <glisse at gcc dot gnu.org> --- (In reply to Andrew Pinski from comment #1) > I think this is the optimizations that should be done: > abs(x) < 0 -> x != x for x=NaN, abs(x) is NaN, and NaN<0 is false. So the current simplification to false seems correct. > abs(x) >= 0 -> x u== x x == x. I'd like to canonicalize it to x ord x, but that's a different issue. > abs(x) == 0 -> x == 0 > abs(x) <= 0 -> x == 0 (since this is an ordered comparison) ok > abs(x) u< 0 -> false > abs(x) u>= 0 -> false u<, u>= are true if an argument is NaN... u< can simplify to x unord x, and u>= is always true. > abs(x) u== 0 -> x == 0 x u== 0
