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: unassig...@gcc.gnu.org ReportedBy: t.ar...@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