[Bug middle-end/37150] basic-block vectorization misses some unrolled loops

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=37150

--- Comment #22 from Richard Biener <rguenth at gcc dot gnu.org> ---
Not costing redundant permutations (using a too trival implementation but good
enough for this case):

t.f90:158:0: note: Cost model analysis:
  Vector inside of basic block cost: 984
  Vector prologue cost: 0
  Vector epilogue cost: 0
  Scalar cost of basic block: 616
t.f90:158:0: note: not vectorized: vectorization is not profitable.