In almost any nontrivial C project, using GCC 4.4 SVN (rev 144432) results in an ICE when building with any nonzero value of -O and -floop-interchange.
-- Summary: ICE when compiling with -O[s123] -floop-interchange Product: gcc Version: 4.4.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: il dot basso dot buffo at gmail dot com GCC host triplet: x86_64-pc-linux-gnu GCC target triplet: x86_64-pc-linux-gnu http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39308