These two files taken from linux kernel (hashes.c) and zlib (infcodes.c) hashes.c:
3.4.4 4.0.0 delta -O0 0.045 0.049 9% -O1 0.067 0.144 115% -O2 0.108 0.177 64% infcodes.c: 3.4.4 4.0.0 delta -O0 0.080 0.086 7% -O1 0.120 0.223 86% -O2 0.196 0.295 51% -- Summary: [4.0 Regression] ~50% compile time regression Product: gcc Version: 4.0.0 Status: UNCONFIRMED Keywords: compile-time-hog Severity: normal Priority: P2 Component: tree-optimization AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: belyshev at lubercy dot com CC: gcc-bugs at gcc dot gnu dot org BugsThisDependsOn: 15678 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18687