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