That was the old x87 stack, that has been (almost) completely replaced by SSE and other vector instruction sets that operate on 32/64 sized elements. Unless you

That was the old x87 stack, that has been (almost) completely replaced by SSE and other vector instruction sets that operate on 32/64 sized elements. Unless you need 80 bit floats or have a mountain of ancient 32 bit intel CPUs without SSE support lying around you should get the expected rounding behavior by default.