File 2301-beam_dict-Simplify-the-internal-format-of-the-lambda.patch of Package erlang

From 04e7370eabd3e36345c032139ab185ea64f169ac Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B6rn=20Gustavsson?= <bjorn@erlang.org>
Date: Wed, 14 Dec 2016 12:55:13 +0100
Subject: [PATCH 01/21] beam_dict: Simplify the internal format of the lambda
 table

Since Index =:= OldIndex and OldUniq =:= 0, there is no need to
store OldIndex and OldUniq in the internal data structure for the
lambda table.
---
 lib/compiler/src/beam_dict.erl | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/lib/compiler/src/beam_dict.erl b/lib/compiler/src/beam_dict.erl
index 9565ab74c..98e0506ba 100644
--- a/lib/compiler/src/beam_dict.erl
+++ b/lib/compiler/src/beam_dict.erl
@@ -148,10 +148,7 @@ string(Str, Dict) when is_list(Str) ->
 lambda(Lbl, NumFree, #asm{lambdas={OldIndex,Lambdas0}}=Dict) ->
     %% Set Index the same as OldIndex.
     Index = OldIndex,
-    %% Initialize OldUniq to 0. It will be set to an unique value
-    %% based on the MD5 checksum of the BEAM code for the module.
-    OldUniq = 0,
-    Lambdas = [{Lbl,{OldIndex,Lbl,Index,NumFree,OldUniq}}|Lambdas0],
+    Lambdas = [{Lbl,{Index,Lbl,NumFree}}|Lambdas0],
     {OldIndex,Dict#asm{lambdas={OldIndex+1,Lambdas}}}.
 
 %% Returns the index for a literal (adding it to the literal table if necessary).
@@ -239,8 +236,11 @@ lambda_table(#asm{locals=Loc0,lambdas={NumLambdas,Lambdas0}}) ->
     Lambdas1 = sofs:relation(Lambdas0),
     Loc = sofs:relation([{Lbl,{F,A}} || {F,A,Lbl} <- Loc0]),
     Lambdas2 = sofs:relative_product1(Lambdas1, Loc),
+    %% Initialize OldUniq to 0. It will be set to an unique value
+    %% based on the MD5 checksum of the BEAM code for the module.
+    OldUniq = 0,
     Lambdas = [<<F:32,A:32,Lbl:32,Index:32,NumFree:32,OldUniq:32>> ||
-		  {{_,Lbl,Index,NumFree,OldUniq},{F,A}} <- sofs:to_external(Lambdas2)],
+		  {{Index,Lbl,NumFree},{F,A}} <- sofs:to_external(Lambdas2)],
     {NumLambdas,Lambdas}.
 
 %% Returns the literal table.
-- 
2.11.0