Alias analysis is taking a long time now. I seem to have narrowed it down to this patch:
http://gcc.gnu.org/ml/gcc-patches/2006-01/msg00908.html running cpgram.ii shows a regression: before patch: tree alias analysis : 2.49 ( 7%) usr 0.25 ( 5%) sys 6.13 ( 5%) wall 4971 kB ( 1%) ggc TOTAL : 36.90 4.72 130.34 467341 kB after patch: tree alias analysis : 59.00 (63%) usr 0.40 ( 7%) sys 70.43 (36%) wall 4957 kB ( 1%) ggc TOTAL : 94.13 5.43 193.85 468339 kB on a 386 linux machine bootstrapped with checking disabled. cpgram.ii needs to be compiled with -fpermissive -O2 -- Summary: Alias Time explosion Product: gcc Version: 4.2.0 Status: UNCONFIRMED Severity: major Priority: P3 Component: tree-optimization AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: amacleod at redhat dot com GCC build triplet: i686-pc-linux-gnu GCC host triplet: i686-pc-linux-gnu GCC target triplet: i686-pc-linux-gnu http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26804
