Help/Support Need help understanding arm64 Instruction

[asianqueen 2.9k iPhone 13 Pro Max 15.0]

We're going to use this example:

LDR             X8, [SP,#0x90+var_70]
LDR             X8, [X8,#0x478]
LDR             X8, [X8,#0x10]
 LDR             W8, [X8,#0x44]
 SUBS            W8, W8, #2
CSET            W8, NE
TBNZ            W8, #0, loc_100132CEC
 B               loc_100132C40

Can someone explain what is CSET? I know it's a condition set, but it doesn't make any sense to me. It has nothing to compare against. Based on my understanding, If W8 is not equal to; but what is it not equal to? What are we comparing against? Any help is much appreciated.

[Saitama 32.2k iPhone 6s Plus 15.7.9]

such said documentation - before must be any compare

also try look into decompiled version of code

*pseudo-code