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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/62283] basic-block vectorization fails
Date: Wed, 27 Aug 2014 12:00:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62283

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |missed-optimization
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2014-08-27
             Blocks|                            |53947
           Assignee|unassigned at gcc dot gnu.org      |rguenth at gcc dot gnu.org
            Summary|SSE optimization fails      |basic-block vectorization
                   |                            |fails
     Ever confirmed|0                           |1

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed.  This is because SLP analysis sees a load from *alpha which it
doesn't
consider handling as extern def as it handles parameters.

Let me see if I can easily fix this.