Compare the last binary digit to 1 in MIPS assembly

Asked Dec 07 '12 at 23:17

Active Dec 07 '12 at 23:17

Viewed 1,303 times

I have to check if a number is even or odd.

My strategy:

How do I compare the last digit of a register value to a 0 or to a 1 ?

I tried:

andi $t7, $t0, 0 # where $t0 = 3 in decimal so should be 0b11

it doesnt work :( Any hint?

asked Dec 07 '12 at 23:17

piggyback

3

what about `andi $t7, $t0, 1`? – John Dvorak Dec 07 '12 at 23:27
shouldnt be the same thing? – piggyback Dec 07 '12 at 23:38
2

Of course it won't be the same. Do you expect a result other than 0 after ANDing something with 0? – Jeff Dec 08 '12 at 00:28
1

In general (I don't know MIPS assembly) you would and with a bit mask of `0x00000001` and then see if your number was 1 or 0. – Linuxios Dec 08 '12 at 14:43
if you write this as an answer I can mark this as correct. – piggyback Dec 08 '12 at 15:33

0 Answers0