[Bug tree-optimization/71261] [7 Regression] Trunk GCC hangs on knl and broadwell targets

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71261

--- Comment #8 from Richard Biener <rguenth at gcc dot gnu.org> ---
Oh, it's quite "obvious" that unrolling exposes a lot of redundancies and
bool pattern fixup will unshare stuff exponentially ...