[Bug rtl-optimization/61657] Undefined behavior in loop-iv.c

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61657

--- Comment #9 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
Patch posted: https://gcc.gnu.org/ml/gcc-patches/2015-08/msg01308.html