iir: fmt [nfc]
@@ -164,7 +164,8 @@ impl IIR {
// `xy` contains x0 x1 y0 y1 y2
// Increment time x1 x2 y1 y2 y3
// Shift x1 x1 x2 y1 y2
- xy.copy_within(0..n - 1, 1); // unrolls better than xy.rotate_right(1)
+ // This unrolls better than xy.rotate_right(1)
+ xy.copy_within(0..n - 1, 1);
// Store x0 x0 x1 x2 y1 y2
xy[0] = x0;
// Compute y0 by multiply-accumulate
