From b1766c8ff90638f85d6993e5c2986c39792737c3 Mon Sep 17 00:00:00 2001
From: Daniel Kukula <daniel.kuku@gmail.com>
Date: Thu, 27 Aug 2026 23:03:07 +0200
Subject: [PATCH 1/2] Cache common indentation for small binaries

Inline newlines at break call sites and generate function heads for common indentation widths.

Assisted-by: Gemini 3.8 Flash
---
 lib/elixir/lib/inspect/algebra.ex | 22 ++++++++++++++++------
 1 file changed, 16 insertions(+), 6 deletions(-)

diff --git a/lib/elixir/lib/inspect/algebra.ex b/lib/elixir/lib/inspect/algebra.ex
index 34ff70e4ae..a6f3073435 100644
--- a/lib/elixir/lib/inspect/algebra.ex
+++ b/lib/elixir/lib/inspect/algebra.ex
@@ -1295,7 +1295,7 @@ defmodule Inspect.Algebra do
     do: format(w, k, t, acc)
 
   defp format(w, _, i, _, doc_line(), t, acc),
-    do: format(w, i, t, <<acc::binary, indent(i)::binary>>)
+    do: format(w, i, t, <<acc::binary, @newline, spaces(i)::binary>>)
 
   defp format(w, k, i, m, doc_cons(x, y), t, acc),
     do: format(w, k, i, m, x, [{i, m, y} | t], acc)
@@ -1325,14 +1325,14 @@ defmodule Inspect.Algebra do
     if w == :infinity or m == :flat or fits?(w, k, true, t) do
       format(w, k, t, <<acc::binary, s::binary>>)
     else
-      format(w, i, t, <<acc::binary, indent(i)::binary>>)
+      format(w, i, t, <<acc::binary, @newline, spaces(i)::binary>>)
     end
   end
 
   # Strict breaks are conditional to the mode
   defp format(w, k, i, mode, doc_break(s, :strict), t, acc) do
     if mode == :break do
-      format(w, i, t, <<acc::binary, indent(i)::binary>>)
+      format(w, i, t, <<acc::binary, @newline, spaces(i)::binary>>)
     else
       format(w, k + byte_size(s), t, <<acc::binary, s::binary>>)
     end
@@ -1388,9 +1388,14 @@ defmodule Inspect.Algebra do
   end
 
   defp collapse(t, max, count, i) do
-    [:binary.copy("\n", min(max, count)), :binary.copy(" ", i) | t]
+    [newlines(min(max, count)), spaces(i) | t]
   end
 
+  defp newlines(0), do: ""
+  defp newlines(1), do: @newline
+  defp newlines(2), do: @newline <> @newline
+  defp newlines(n), do: :binary.copy(@newline, n)
+
   defp strip_whitespace(" " <> rest), do: strip_whitespace(rest)
   defp strip_whitespace(rest), do: rest
 
@@ -1398,6 +1403,11 @@ defmodule Inspect.Algebra do
   defp apply_nesting(_, _, :reset), do: 0
   defp apply_nesting(i, _, j), do: i + j
 
-  defp indent(0), do: @newline
-  defp indent(i), do: @newline <> :binary.copy(" ", i)
+  for i <- 0..64 do
+    defp spaces(unquote(i)) do
+      unquote(:binary.copy(" ", i))
+    end
+  end
+
+  defp spaces(i), do: :binary.copy(" ", i)
 end

From b54acbb79fde079c3950e47e58c4dca20f1c9735 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jos=C3=A9=20Valim?= <jose.valim@gmail.com>
Date: Sat, 26 Sep 2026 22:23:19 +0200
Subject: [PATCH 2/2] Update lib/elixir/lib/inspect/algebra.ex

---
 lib/elixir/lib/inspect/algebra.ex | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/elixir/lib/inspect/algebra.ex b/lib/elixir/lib/inspect/algebra.ex
index a6f3073435..5afeb393a3 100644
--- a/lib/elixir/lib/inspect/algebra.ex
+++ b/lib/elixir/lib/inspect/algebra.ex
@@ -1403,7 +1403,7 @@ defmodule Inspect.Algebra do
   defp apply_nesting(_, _, :reset), do: 0
   defp apply_nesting(i, _, j), do: i + j
 
-  for i <- 0..64 do
+  for i <- 0..16 do
     defp spaces(unquote(i)) do
       unquote(:binary.copy(" ", i))
     end