v0.5.8: fix codehash phase

Author: lispc

zkevm-circuits/src/evm_circuit/util.rs

@@ -199,14 +199,14 @@ impl<'r, 'b, F: FieldExt> CachedRegion<'r, 'b, F> {
     }
 
     pub fn code_hash(&self, n: U256) -> Value<F> {
-        self.challenges.evm_word().map(|r| {
-            if cfg!(feature = "poseidon-codehash") {
-                // only FieldExt is not enough for ToScalar trait so we have to make workaround
-                rlc::value(&n.to_le_bytes(), F::from(256u64))
-            } else {
-                rlc::value(&n.to_le_bytes(), r)
-            }
-        })
+        if cfg!(feature = "poseidon-codehash") {
+            // only FieldExt is not enough for ToScalar trait so we have to make workaround
+            Value::known(rlc::value(&n.to_le_bytes(), F::from(256u64)))
+        } else {
+            self.challenges
+                .evm_word()
+                .map(|r| rlc::value(&n.to_le_bytes(), r))
+        }
     }
 
     pub fn keccak_rlc(&self, le_bytes: &[u8]) -> Value<F> {