[Bug tree-optimization/115766] [12/13/14 Regression] wrong code at optimization levels -O2, -O3

[sjames at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115766

--- Comment #8 from Sam James <sjames at gcc dot gnu.org> ---
Are you sure the reduced one is accurate? For me, it behaves the same with
-O0..-O3 for GCC. For Clang, it has the same behaviour as GCC with -O0, and
"passes" with > -O0.