http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53950
Bug #: 53950 Summary: 1.5 times slowdown from 4.4.0 to 4.7.0 Classification: Unclassified Product: gcc Version: 4.7.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: fortran AssignedTo: unassig...@gcc.gnu.org ReportedBy: kapo...@yahoo.com Created attachment 27784 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=27784 Demonstration of slowdown I'm using MinGW GCC 4.4.0 to work with C/C++/Fortran project. Some days ago I've downloaded web installer and switched to GCC 4.7.0. Unfortunately I noticed a dramatic performance regression. I attach a minimal program that demonstrates the slowdown to the ticket. Compiled with "gfortran -o test_self.exe -O3 test_self.f90" I get on my Core i7: GCC 4.4.0: Time of operation was 1.2012070 seconds GCC 4.7.0: Time of operation was 1.85641098 seconds Yury Kapoyko, Russia