[Bug tree-optimization/78114] [7 regression] gfortran.dg/vect/fast-math-mgrid-resid.f FAILs

amker at gcc dot gnu.org gcc-bugzilla@gcc.gnu.org
Thu Nov 10 16:25:00 GMT 2016


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78114

--- Comment #7 from amker at gcc dot gnu.org ---
Here is the reason failing with haswell.
The loop is vectorized by vf=4, but iteration distance for all possible
predictive commoning chains are at most 2 (by iterations), so after vf=4
vectorization, there is no predictive commoning opportunities.


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