Return instruction for the gameboy cpu emulator I'm writing

gistfile1.cpp

void Instructions::doReturn(CPU* cpu, BYTE pOpcode) {
  if (pOpcode == 0xc9
	|| (pOpcode == 0xc0 && cpu->reg->getFlagZ() == 0)
	|| (pOpcode == 0xc8 && cpu->reg->getFlagZ() == 1)
	|| (pOpcode == 0xd0 && cpu->reg->getFlagC() == 0)
	|| (pOpcode == 0xd8 && cpu->reg->getFlagC() == 1)) {
		cpu->reg->setPC((WORD)((cpu->mem.readByte(cpu->reg->getSP() + 1) << 8) | cpu->mem.readByte(cpu->reg->getSP())));
		cpu->reg->incSP(2);
		cpu->clock.m += 5;
		cpu->clock.t += 20;
	}
	else {
		cpu->clock.m += 2;
		cpu->clock.t += 8;
	}
}