I’ve been trying to debug a program I’m working on and have managed to narrow it down to a single not statement. I fail to understand how this could fail. My current suspicion is the fact that I’m using a 16 bit (aka short) register. Should I even be using this?
Before not di |
1101111110000000 |
Expected after not di |
0010000001111111 |
Actually after not di |
10000001111111 |
Code
.certain:
not di ; ← this line is the problem
bsf ax, di
GDB output
(gdb) p/t (short) $di $4 = 1101111110000000
(gdb) nexti
(gdb) p/t (short) $di $5 = 10000001111111
Your result is correct, is just not displaying the leading zeros.
Do you perhaps know how to show the leading zeros?
I’m not great with gdb but I think using the x cmd shows them.
Yes, but that doesn’t seem to work with registers
Thanks, I somehow completely missed that.