diff --git a/src/planner.rs b/src/planner.rs
new file mode 100644
index 0000000..e5d5a47
--- /dev/null
+++ b/src/planner.rs
@@ -0,0 +1,50 @@
+use crate::twiddles::{generate_twiddles, generate_twiddles_simd};
+
+pub struct Planner {
+    pub twiddles_re: Vec<f64>,
+    pub twiddles_im: Vec<f64>,
+}
+
+impl Planner {
+    /// Create a `Planner` for an FFT of size `num_points`
+    ///
+    /// # Panics
+    ///
+    /// Panics if `num_points` is less than 1
+    pub fn new(num_points: usize) -> Self {
+        assert!(num_points > 0);
+        if num_points <= 4 {
+            return Self {
+                twiddles_re: vec![],
+                twiddles_im: vec![],
+            };
+        }
+
+        let dist = num_points >> 1;
+        let (twiddles_re, twiddles_im) = if dist >= 8 * 2 {
+            generate_twiddles_simd(dist)
+        } else {
+            generate_twiddles(dist)
+        };
+
+        assert_eq!(twiddles_re.len(), twiddles_im.len());
+
+        Self {
+            twiddles_re,
+            twiddles_im,
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::planner::Planner;
+
+    #[test]
+    fn no_twiddles() {
+        for num_points in 2..=4 {
+            let planner = Planner::new(num_points);
+            assert!(planner.twiddles_im.is_empty() && planner.twiddles_re.is_empty());
+        }
+    }
+}