GETARG_sBx
int offset = GETARG_sBx(fs->f->code[pc]);
int b = GETARG_sBx(i);
ci->u.l.savedpc += GETARG_sBx(i) + e; }
ci->u.l.savedpc += GETARG_sBx(i); /* jump back */
ci->u.l.savedpc += GETARG_sBx(i);
ci->u.l.savedpc += GETARG_sBx(i); /* jump back */