PSR_N
if (frame->tf_spsr & PSR_N) {
match = (spsr & PSR_N) != 0;
match = (!(spsr & PSR_N) == !(spsr & PSR_V));
match = !(spsr & PSR_Z) && (!(spsr & PSR_N) == !(spsr & PSR_V));
res = (frame->tf_spsr & PSR_N) != 0;
res = ((frame->tf_spsr & PSR_N) != 0) ==
(((frame->tf_spsr & PSR_N) != 0) ==