问题
I have:
mov ecx, r
.if ecx < 0
mov cl, 0
.elseif ecx > 255
mov cl, 255
.endif
mov [eax + 2], cl
r is signed integer. I want it to cap it within byte limit. But problem is when "r" is negative. It is treated as if it is unsigned.
Input -> Expected output
r = 300 -> 255
r = 12 -> 12
r = -134 -> 0
What actually happenes:
r = 300 -> 255
r = 12 -> 12
r = -134 -> 255 <--------- Here it gets treated as if -134 is bigger than 255
How to fix it?
回答1:
Shortest solution:
.if SDWORD PTR ecx < 0
来源：https://stackoverflow.com/questions/26535786/masm-if-with-signed-numbers-comparison