From 99410eab8d647954ba9b253ef4d686578e048dd3 Mon Sep 17 00:00:00 2001
From: "Mayeul@Zama" <69792125+mayeul-zama@users.noreply.github.com>
Date: Wed, 9 Oct 2024 10:23:43 +0200
Subject: [PATCH] doc(core): add comment on PolynomialSize::log2

---
 tfhe/src/core_crypto/commons/parameters.rs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tfhe/src/core_crypto/commons/parameters.rs b/tfhe/src/core_crypto/commons/parameters.rs
index 6e648d234b..0eeb5cac3a 100644
--- a/tfhe/src/core_crypto/commons/parameters.rs
+++ b/tfhe/src/core_crypto/commons/parameters.rs
@@ -137,8 +137,9 @@ pub struct PolynomialSize(pub usize);
 
 impl PolynomialSize {
     /// Return the associated [`PolynomialSizeLog`].
+    /// If the polynomial size is not a power of 2, returns the floor of its log2
     pub fn log2(&self) -> PolynomialSizeLog {
-        PolynomialSizeLog((self.0 as f64).log2().ceil() as usize)
+        PolynomialSizeLog(self.0.ilog2() as usize)
     }
 
     pub fn to_fourier_polynomial_size(&self) -> FourierPolynomialSize {