[Bug tree-optimization/54135] New: Dhrystone 2 test performance has seriously decreased in recent GCC releases

[t.artem at mailcity dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54135

             Bug #: 54135
           Summary: Dhrystone 2 test performance has seriously decreased
                    in recent GCC releases
    Classification: Unclassified
           Product: gcc
           Version: 4.7.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: t.artem@mailcity.com


According to Phoronix Test Suite 4, Dhrystone 2 test from BYTE Unix Benchmark
has become significantly slower in recent GCC releases.

GCC 4.4.6 ~ 28 000 000 marks
GCC 4.7.1 ~ 23 000 000 marks

I.e. ~ 22% slower.

Presumably the following GCC flags were used: -O2 -march=native

Hardware platform: x86-64, Intel Core i7 3960X

Benchmark sources: http://www.tux.org/~mayer/linux/bmark.html

Test results:
http://openbenchmarking.org/prospect/1207296-SU-ARCHLINUX98/eeca68961a90e60898a774766ed28402c20eea75