From 4ecd26b3651fd3069cfd65055d654afb8e9d554c Mon Sep 17 00:00:00 2001
From: Charles Cooper <cooper.charles.m@gmail.com>
Date: Wed, 7 Feb 2024 04:34:16 -0800
Subject: [PATCH] perf: reimplement `IRnode.__deepcopy__` (#3761)

`deepcopy` is a hotspot for compile time. this commit results in a 16%
improvement in compile time.
---
 vyper/codegen/ir_node.py | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/vyper/codegen/ir_node.py b/vyper/codegen/ir_node.py
index 45d93f3067..b1a71021c8 100644
--- a/vyper/codegen/ir_node.py
+++ b/vyper/codegen/ir_node.py
@@ -1,4 +1,5 @@
 import contextlib
+import copy
 import re
 from enum import Enum, auto
 from functools import cached_property
@@ -392,6 +393,14 @@ def __init__(
             raise CompilerPanic(f"Invalid value for IR AST node: {self.value}")
         assert isinstance(self.args, list)
 
+    # deepcopy is a perf hotspot; it pays to optimize it a little
+    def __deepcopy__(self, memo):
+        cls = self.__class__
+        ret = cls.__new__(cls)
+        ret.__dict__ = self.__dict__.copy()
+        ret.args = [copy.deepcopy(arg) for arg in ret.args]
+        return ret
+
     # TODO would be nice to rename to `gas_estimate` or `gas_bound`
     @property
     def gas(self):