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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/56812] Simple loop is not SLP-vectorized after r196872
Date: Tue, 02 Apr 2013 13:20:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56812

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |WAITING
   Last reconfirmed|                            |2013-04-02
     Ever Confirmed|0                           |1

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> 2013-04-02 13:20:47 UTC ---
It should not make a difference ... I see that vectorization is determined
to be not profitable though:

t.C:11: note: === vect_update_slp_costs_according_to_vf ===cost model: prologue
peel iters set to vf/2.cost model: epilogue peel iters set to vf/2 because
peeling for alignment is unknown.
t.C:11: note: Cost model analysis:
  Vector inside of loop cost: 1
  Vector prologue cost: 11
  Vector epilogue cost: 2
  Scalar iteration cost: 1
  Scalar outside cost: 0
  Vector outside cost: 13
  prologue iterations: 2
  epilogue iterations: 2
  Calculated minimum iters for profitability: 17

but it's not vectorized with 4.8 either.  -fno-vect-cost-model fixes this.

Are you sure you attached the correct testcase?