From 44b548e3d9eb7d265ecdefe6e3b52180a6eb4521 Mon Sep 17 00:00:00 2001
From: Charles Cooper <cooper.charles.m@gmail.com>
Date: Thu, 31 Mar 2022 22:05:38 +0000
Subject: [PATCH] only loop if left and right are not literals

---
 vyper/codegen/core.py | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/vyper/codegen/core.py b/vyper/codegen/core.py
index 7b76b5e9b7..d1c0b0b39c 100644
--- a/vyper/codegen/core.py
+++ b/vyper/codegen/core.py
@@ -815,7 +815,13 @@ def _complex_make_setter(left, right):
         assert _len == left.typ.storage_size_in_words * 32  # only the paranoid survive
         return copy_bytes(left, right, _len, _len)
 
-    if isinstance(left.typ, SArrayType) and left.typ.count > ROLL_ARRAY_TUNING:
+    should_loop = (
+        isinstance(left.typ, SArrayType)
+        and left.typ.count > ROLL_ARRAY_TUNING
+        and not left.is_literal
+        and not right.is_literal
+    )
+    if should_loop:
         n = left.typ.count
 
         i = IRnode.from_list(_freshname("copy_sarray_ix"), typ="uint256")