From 3398cc02c91e5231b2552ae92a75b9dd2c05be29 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B6rn=20Gustavsson?= <bjorn@erlang.org>
Date: Mon, 18 Mar 2019 05:41:31 +0100
Subject: Remove the move_dup instruction

move_dup is used very infrequently.
---
 erts/emulator/beam/instrs.tab | 4 ----
 erts/emulator/beam/ops.tab    | 7 -------
 2 files changed, 11 deletions(-)

(limited to 'erts')

diff --git a/erts/emulator/beam/instrs.tab b/erts/emulator/beam/instrs.tab
index 590a55eb9d..3cb12dba4a 100644
--- a/erts/emulator/beam/instrs.tab
+++ b/erts/emulator/beam/instrs.tab
@@ -500,10 +500,6 @@ move3(S1, D1, S2, D2, S3, D3) {
     $D3 = $S3;
 }
 
-move_dup(Src, D1, D2) {
-    $D1 = $D2 = $Src;
-}
-
 move2_par(S1, D1, S2, D2) {
     Eterm V1, V2;
     V1 = $S1;
diff --git a/erts/emulator/beam/ops.tab b/erts/emulator/beam/ops.tab
index 649d861c80..b405999f2a 100644
--- a/erts/emulator/beam/ops.tab
+++ b/erts/emulator/beam/ops.tab
@@ -369,13 +369,6 @@ swap_temp x x x
 swap xy x
 swap y y
 
-# move_dup
-
-move Src=x D1=x | move Src=x D2=x => move_dup Src D1 D2
-move Src=x SD=x | move SD=x  D=x  => move_dup Src SD D
-
-move_dup x x x
-
 # move_shift
 
 move SD=x    D=x | move Src=cxy SD=x  | distinct(D, Src) => move_shift Src SD D
-- 
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