[Bug middle-end/43359] New: gas_dyn benchmark 230% slower when compiled with -fgraphite-identity

["howarth at nitro dot med dot uc dot edu" <gcc-bugzilla at gcc dot gnu dot org>]

The polyhedron 2005 benchmark gas_dyn executes 230% slower when compiled with
-fgraphite=identity and -ffast-math -funroll-loops -O3 on i686-apple-darwin10.
The majority of the slowdown is due to reduced optimizations in the EOS
subroutine of the benchmark. If that subroutine is compiled separately
without-fgraphite-identity, the gas_dyn benchmark only executes 57% slower.
Reduced optimizations in the CHOZDT subroutine by -fgraphite-identity is due
for this remaining 57% slowdown.


-- 
           Summary: gas_dyn benchmark 230% 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: i686-apple-darwin10
  GCC host triplet: i686-apple-darwin10
GCC target triplet: i686-apple-darwin10


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43359