> The problem was that we had some optimzations added to the
> reload_cse_move2add pass that would attempt transformations with
> multi-hard-register registers, without keeping track of the validity of the
> values in all hard registers involved.
That's not clear to me: for example in move2add_note_store, we reset the info
about any multi hard-register; moveover 5 arrays are supposed to be maintained
for each hard-register:
for (i = FIRST_PSEUDO_REGISTER - 1; i >= 0; i--)
{
reg_set_luid[i] = 0;
reg_offset[i] = 0;
reg_base_reg[i] = 0;
reg_symbol_ref[i] = NULL_RTX;
reg_mode[i] = VOIDmode;
}
so I'm not sure whether we really properly handle multi hard-registers. So
what about explicitly punting for multi hard-registers in reload_cse_move2add?
Do you think that this would pessimize too much in practice?
--
Eric Botcazou
