[Bug middle-end/40979] New: induct benchmark 60% slower when compiled with -fgraphite-identity

[howarth at nitro dot med dot uc dot edu]

The Polyhedron 2005 induct benchmark averages 12.44 seconds run-time when
compiled with...

gfortran -ffast-math -funroll-loops -msse3 -O3 induct.f90 -o induct

but averages 20.2 seconds when compiled with -fgraphite-identity added to the
compilation flags.
This issue remains after...

http://gcc.gnu.org/ml/gcc-patches/2009-08/msg00220.html
http://gcc.gnu.org/ml/gcc-patches/2009-08/msg00294.html

are applied to r150500.


-- 
           Summary: induct benchmark 60% slower when compiled with -
                    fgraphite-identity
           Product: gcc
           Version: 4.5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: howarth at nitro dot med dot uc dot edu
 GCC build triplet: x86_64-apple-darwin10
  GCC host triplet: x86_64-apple-darwin10
GCC target triplet: x86_64-apple-darwin10


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40979