From 3fb87a73f05a34a943fc19d8535bd69b6dac08cb Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Eric=20Meadows-J=C3=B6nsson?=
 <eric.meadows.jonsson@gmail.com>
Date: Fri, 14 Aug 2026 14:29:22 +0200
Subject: [PATCH 1/2] Optimize comparison of parsed versions

---
 lib/elixir/lib/version.ex               | 11 +++++++++++
 lib/elixir/test/elixir/version_test.exs | 20 ++++++++++++++++++++
 2 files changed, 31 insertions(+)

diff --git a/lib/elixir/lib/version.ex b/lib/elixir/lib/version.ex
index 076964b3000..8dbaf264642 100644
--- a/lib/elixir/lib/version.ex
+++ b/lib/elixir/lib/version.ex
@@ -362,11 +362,22 @@ defmodule Version do
 
   """
   @spec compare(version, version) :: :gt | :eq | :lt
+  def compare(
+        %Version{major: major1, minor: minor1, patch: patch1, pre: pre1},
+        %Version{major: major2, minor: minor2, patch: patch2, pre: pre2}
+      ) do
+    do_compare(major1, minor1, patch1, pre1, major2, minor2, patch2, pre2)
+  end
+
   def compare(version1, version2) do
     do_compare(to_matchable(version1, true), to_matchable(version2, true))
   end
 
   defp do_compare({major1, minor1, patch1, pre1, _}, {major2, minor2, patch2, pre2, _}) do
+    do_compare(major1, minor1, patch1, pre1, major2, minor2, patch2, pre2)
+  end
+
+  defp do_compare(major1, minor1, patch1, pre1, major2, minor2, patch2, pre2) do
     cond do
       major1 > major2 -> :gt
       major1 < major2 -> :lt
diff --git a/lib/elixir/test/elixir/version_test.exs b/lib/elixir/test/elixir/version_test.exs
index 6de54b01eb5..3b7844a5c6e 100644
--- a/lib/elixir/test/elixir/version_test.exs
+++ b/lib/elixir/test/elixir/version_test.exs
@@ -38,6 +38,26 @@ defmodule VersionTest do
     assert Version.compare("1.5.0-rc.0", "1.5.0-rc0") == :lt
   end
 
+  test "compare/2 with Version structs" do
+    large_major = Bitwise.bsl(1, 256)
+    large_pre = Bitwise.bsl(1, 128)
+    left = %Version{major: large_major, minor: 2, patch: 3, pre: ["alpha", large_pre]}
+    right = %Version{major: large_major, minor: 2, patch: 3, pre: ["alpha", large_pre + 1]}
+
+    assert Version.compare(left, right) == :lt
+    assert Version.compare(right, left) == :gt
+    assert Version.compare(left, %{left | major: large_major + 1}) == :lt
+    assert Version.compare(%{left | minor: 1}, %{left | minor: 2}) == :lt
+    assert Version.compare(%{left | patch: 2}, %{left | patch: 3}) == :lt
+    assert Version.compare(%{left | pre: [1]}, %{left | pre: ["alpha"]}) == :lt
+    assert Version.compare(%{left | pre: ["alpha"]}, %{left | pre: ["alpha", 1]}) == :lt
+    assert Version.compare(%{left | pre: ["alpha"]}, %{left | pre: []}) == :lt
+    assert Version.compare(%{left | pre: []}, %{left | pre: ["alpha"]}) == :gt
+    assert Version.compare(%{left | build: "left"}, %{left | build: "right"}) == :eq
+    assert Version.compare(%{left | major: 1}, "2.0.0") == :lt
+    assert Version.compare("2.0.0", %{left | major: 1}) == :gt
+  end
+
   test "compare/2 with invalid versions" do
     assert_raise Version.InvalidVersionError, fn ->
       Version.compare("1.0", "1.0.0")

From cdfc35498b06f405c92531c43676e4c8fc077c00 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Eric=20Meadows-J=C3=B6nsson?=
 <eric.meadows.jonsson@gmail.com>
Date: Fri, 14 Aug 2026 15:45:38 +0200
Subject: [PATCH 2/2] Simplify version comparison fallback

---
 lib/elixir/lib/version.ex | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/lib/elixir/lib/version.ex b/lib/elixir/lib/version.ex
index 8dbaf264642..ec359f93d26 100644
--- a/lib/elixir/lib/version.ex
+++ b/lib/elixir/lib/version.ex
@@ -370,10 +370,9 @@ defmodule Version do
   end
 
   def compare(version1, version2) do
-    do_compare(to_matchable(version1, true), to_matchable(version2, true))
-  end
+    {major1, minor1, patch1, pre1, _} = to_matchable(version1, true)
+    {major2, minor2, patch2, pre2, _} = to_matchable(version2, true)
 
-  defp do_compare({major1, minor1, patch1, pre1, _}, {major2, minor2, patch2, pre2, _}) do
     do_compare(major1, minor1, patch1, pre1, major2, minor2, patch2, pre2)
   end