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Since x > 0, the term $(1-2x_{i})<0$, so dividing gets:

${\begin{aligned}2\left[(x_{i}^{2}+y_{i}^{2}-r^{2})+(2y_{i}+1)\right]+(1-2x_{i})&>0\\2\left[RE(x_{i},y_{i})+Y_{\text{Change}}\right]+X_{\text{Change}}&>0\\\end{aligned}}$

Thus, the decision criterion changes from using floating-point operations to simple integer addition, subtraction, and bit shifting (for the multiply by 2 operations). If ⁠$2(RE+Y_{\text{Change}})+X_{\text{Change}}>0$⁠, then decrement the X value. If ⁠$2(RE+Y_{\text{Change}})+X_{\text{Change}}\leq 0$⁠, then keep the same X value. Again, by reflecting these points in all the octants, a full circle results.

We may reduce computation by only calculating the delta between the values of this condition formula from its value at the previous step. We start by assigning ⁠$E$⁠ as ⁠$3-2r$⁠ which is the initial value of the formula at ⁠${1}$⁠, then as above if ⁠$E>0$⁠ we update it as ⁠$E=E+2(5-2x+2y)$⁠ (and decrement X), otherwise ⁠$E=E+2(3+2y)$⁠ thence increment Y as usual.

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