Function SqrtF

rEFIt_UEFI/libeg/FloatLib.cpp:16–43

we will assume sqrt(abs(x))

//we will assume sqrt(abs(x))
float SqrtF(float X)
{
	/*
  struct FloatInt {
    union {
      INT32 i;
      float f;
    } fi;
  };
  */
  if (X == 0.0f) {
    return 0.0f;
  } else if (X < 0.0f) {
    X = -X;
  }
//  struct FloatInt Y;
  float Yf;
  Yf = X * 0.3f;
//  Y.i = Y.i >> 1; // dirty hack - first iteration
  //do six iterations
  Yf = Yf * 0.5f + X / (Yf * 2.0f);
  Yf = Yf * 0.5f + X / (Yf * 2.0f);
  Yf = Yf * 0.5f + X / (Yf * 2.0f);
  Yf = Yf * 0.5f + X / (Yf * 2.0f);
  Yf = Yf * 0.5f + X / (Yf * 2.0f);
  Yf = Yf * 0.5f + X / (Yf * 2.0f);
  return Yf;
}

float CosF(float X);