Hi, I'm (still) porting GCC to a 16 bit microcontroller, and I'm having a few issues with the way it handles memory accesses: this microcontroller can function in two modes: in one of them the pointers are on 16 bit (a full register), in the second one the pointers are on 32 bit and are stored in two following registers (N and N+1).
I did implement a GCC option to select between the two modes, and I'm using this option to select the size of the pointers and Pmode: #define Pmode ((TARGET_16) ? HImode : SImode) #define POINTER_SIZE ((TARGET_16) ? 16 : 32) Do I need to define movsi3(), addsi3() etc. patterns manually or should GCC figure those by itself ? Is there something special I need to do to express the relationship between the two registers N and N+1 composing a pointer, or does GCC automatically allocate two subsequent HI registers when it needs a SI one ? Thanks. -- Stelian Pop <stel...@popies.net>
