http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53881
--- Comment #7 from David Binderman <dcb314 at hotmail dot com> 2012-07-22 19:01:50 UTC --- Created attachment 27854 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=27854 C source code Flag -O2 required. The compiler said ui.c:7157:1: internal compiler error: in emit_case_bit_tests, at tree-switch-conversion.c:340 } ^ Please submit a full bug report, with preprocessed source if appropriate. See <http://gcc.gnu.org/bugs.html> for instructions.