From d1beb92790cb6d0cd82e8ebe4cc7bfcde50af399 Mon Sep 17 00:00:00 2001
From: Jonathan Wang <31040440+jonathanpwang@users.noreply.github.com>
Date: Fri, 21 Jul 2023 19:34:12 -0400
Subject: [PATCH] chore: make `bit_length` const function

---
 halo2-base/src/utils/mod.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/halo2-base/src/utils/mod.rs b/halo2-base/src/utils/mod.rs
index 2117b1ee..0000a408 100644
--- a/halo2-base/src/utils/mod.rs
+++ b/halo2-base/src/utils/mod.rs
@@ -121,7 +121,7 @@ pub(crate) fn decompose_u64_digits_to_limbs(
 }
 
 /// Returns the number of bits needed to represent the value of `x`.
-pub fn bit_length(x: u64) -> usize {
+pub const fn bit_length(x: u64) -> usize {
     (u64::BITS - x.leading_zeros()) as usize
 }