cp r

• cp r - set flags as if A - r

unsigned integers

• If A == r, then Z flag is set.
• If A != r, then Z flag is reset.
• If A < r, then C flag is set.
• If A >= r, then C flag is reset.

signed integers

• If A == r, then Z flag is set.
• If A != r, then Z flag is reset.
• If A < r, then S and P/V are different.
• If A >= r, then S and P/V are the same.

source: z80 heaven