[Bug rtl-optimization/78634] [7 Regression] 30% performance drop after r242832.

[bernds at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78634

--- Comment #1 from Bernd Schmidt <bernds at gcc dot gnu.org> ---
Patch and discussion here.

https://gcc.gnu.org/ml/gcc-patches/2016-12/msg00212.html