GETARG_Bx
int b = (op == OP_LOADK) ? GETARG_Bx(i)
#define GETARG_sBx(i) (GETARG_Bx(i)-MAXARG_sBx)
(k + (GETARG_Bx(i) != 0 ? GETARG_Bx(i) - 1 : GETARG_Ax(*ci->u.l.savedpc++)))
TValue *rb = k + GETARG_Bx(i);
Proto *p = cl->p->p[GETARG_Bx(i)];