const float cPi = 3.14159265; // 3.14159274
const float4 ePi = float4(
	3.14159e-00,
	2.65358e-06,
	9.79323e-12,
	8.46264e-18
);

const float getPi_dp24() {
    float rPi;
    rPi = ePi[3] +
          ePi[2] +
          ePi[1] +
          ePi[0] ;
    return rPi;
}

const float getPi_dp18() {
    float rPi;
    rPi = ePi[2] +
          ePi[1] +
          ePi[0] ;
    return rPi;
}

const float getPi_dp12() {
    volatile float rPi;
    rPi = ePi[1] +
          ePi[0] ;
    return rPi;
}

float4 main( ) : COLOR0 {
    return float4( cPi, cPi, cPi, cPi ); // ~0.5 instructions :P
    return float4( getPi_dp12(), getPi_dp12(), getPi_dp12(), getPi_dp12() ); // 1 instructions
    return float4( getPi_dp18(), getPi_dp18(), getPi_dp18(), getPi_dp18() ); // 2 instructions
    return float4( getPi_dp24(), getPi_dp24(), getPi_dp24(), getPi_dp24() ); // 3 instructions
}