From 745bec8d4cec329e9720418f74922637da4e8fd1 Mon Sep 17 00:00:00 2001
From: Daniel Lubarov <daniel@lubarov.com>
Date: Fri, 17 Feb 2023 07:19:27 -0800
Subject: [PATCH] Skip log_kernel_instruction if debug logs disabled

---
 evm/src/witness/transition.rs | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/evm/src/witness/transition.rs b/evm/src/witness/transition.rs
index 689dbdd1..d233655c 100644
--- a/evm/src/witness/transition.rs
+++ b/evm/src/witness/transition.rs
@@ -1,4 +1,5 @@
 use itertools::Itertools;
+use log::log_enabled;
 use plonky2::field::types::Field;
 
 use crate::cpu::columns::CpuColumnsView;
@@ -257,8 +258,12 @@ fn try_perform_instruction<F: Field>(state: &mut GenerationState<F>) -> Result<(
 }
 
 fn log_kernel_instruction<F: Field>(state: &mut GenerationState<F>, op: Operation) {
+    // The logic below is a bit costly, so skip it if debug logs aren't enabled.
+    if !log_enabled!(log::Level::Debug) {
+        return;
+    }
+
     let pc = state.registers.program_counter;
-    // TODO: This is affecting performance...
     let is_interesting_offset = KERNEL
         .offset_label(pc)
         .filter(|label| !label.starts_with("halt_pc"))