F_IF
if (ACCESS_FLAG(F_IF))
if (ACCESS_FLAG(F_IF))
!ACCESS_FLAG(F_IF)) {
CLEAR_FLAG(F_IF);
CLEAR_FLAG(F_IF);
SET_FLAG(F_IF);
CLEAR_FLAG(F_IF);
CLEAR_FLAG(F_IF);
CLEAR_FLAG(F_IF);
CLEAR_FLAG(F_IF);