The following program take about 30 seconds to compile on IA64 with -O3 and trunk, but took less than a second with 4.2. On x86_x86 it take about 3 seconds.
(sid)[EMAIL PROTECTED]:~$ time /usr/lib/gcc-snapshot/bin/gcc -c -O3 slow.c real 0m32.572s user 0m18.838s sys 0m0.049s (sid)[EMAIL PROTECTED]:~$ time gcc-4.2 -c -O3 slow.c real 0m0.696s user 0m0.062s sys 0m0.022s (sid)[EMAIL PROTECTED]:~$ -- Summary: [4.3 Regression] slow compilation on ia64 Product: gcc Version: 4.3.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: tree-optimization AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: tbm at cyrius dot com GCC target triplet: ia64-linux-gnu http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33922