[Bug tree-optimization/120443] [13/14/15 regression] wrong code at -O3 since r15-1809

[mikpelinux at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120443

--- Comment #9 from Mikael Pettersson <mikpelinux at gmail dot com> ---
(In reply to Mikael Pettersson from comment #8)
> The revised test case in #c2 stopped failing sometime earlier.

Correction: #c2 stopped failing at the same commit, I forgot that it required
the full -O3 and not just -O2 -funswitch-loops