Hi, looking into gcc source code, I noticed that in some structure definition 'bool' was used and in other ones bitfields were used. In some other cases there is also a mix of the two ! (for exemple in 'dwarf2out.c' - struct dw_fde_struct). Finaly, some even defined a BOOL_BITFIELD which looks like a bool but is an unsigned int !
In most common cases I think that bool or bitfield have the same functionality. Bitfields take less memory than bool but I think that bool are faster *in theory* (i.e. no masking needed but may also use more cache memory and result in slower code...) Is there a prefered version ? Do you think that looking deeper into would be interesting and would impove gcc ? Is there an *easy* way to compare memory consuption and execution time to figure out which version should be prefered ? Christophe Jaillet
