Aurelien Buhrig <aurelien.buhrig.gcc@xxxxxxxxx> writes: > When I add a pointer (PSImode) with an int (HImode) (ex: sp-=cnt) , > gcc expands the signed int by zero_extend'ing the int and then adding > both PSI values (instead of sign extending). > How should I fix this ? > POINTERS_EXTEND_UNSIGNED is 0. > > And what is the difference between ptr_mode and Pmode ? ptr_mode is the integer mode that corresponds to POINTER_SIZE. POINTER_SIZE is the size of a pointer as stored in a register or in memory. Pmode is the mode to use for a pointer. Pmode may be larger than ptr_mode on unusual machines. As far as I know the int will be converted to SIZE_TYPE before being added to the pointer. Converting a signed int to SIZE_TYPE should sign extend if SIZE_TYPE is larger than int. I don't know why you are not seeing that. Ian
