The function move_by_pieces in expr.c enters to endless loop when the backend defines the sizes of all data types to be the same size (aka CHAR_TYPE_SIZE = SHORT_TYPE_SIZE = INT_TYPE_SIZE = anyvalue ).
The loop itself occurs in this code section - while (max_size > 1) { for (tmode = GET_CLASS_NARROWEST_MODE (MODE_INT); tmode != VOIDmode; tmode = GET_MODE_WIDER_MODE (tmode)) if (GET_MODE_SIZE (tmode) < max_size) mode = tmode; if (mode == VOIDmode) break; icode = mov_optab->handlers[(int) mode].insn_code; if (icode != CODE_FOR_nothing && align >= GET_MODE_ALIGNMENT (mode)) move_by_pieces_1 (GEN_FCN (icode), mode, &data); max_size = GET_MODE_SIZE (mode); } The idea here is to decrease the sizes of copying insn, or something like that, But what if it isnt decreasing? Thanks. -- Summary: move_by_pieces in expr.c function bug Product: gcc Version: 4.1.1 Status: UNCONFIRMED Severity: major Priority: P3 Component: c AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: omer dot medan at gmail dot com http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31469