SIZE_A
#define SIZE_Ax (SIZE_C + SIZE_B + SIZE_A)
#define POS_C (POS_A + SIZE_A)
#define MAXARG_A ((1<<SIZE_A)-1)
#define GETARG_A(i) getarg(i, POS_A, SIZE_A)
#define SETARG_A(i,v) setarg(i, v, POS_A, SIZE_A)