From d8a47b34744be64db10a458991bf340328af8f9c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B6rn=20Gustavsson?= <bjorn@erlang.org>
Date: Thu, 16 Dec 2010 08:22:11 +0100
Subject: Introduce a few more variations of the move instructions

Frequency counts show that

  move Const x(1)
  move Const x(2)

are very common.
---
 erts/emulator/beam/beam_emu.c | 11 +++++++++++
 erts/emulator/beam/ops.tab    |  6 ++++++
 2 files changed, 17 insertions(+)

diff --git a/erts/emulator/beam/beam_emu.c b/erts/emulator/beam/beam_emu.c
index edb4d61ed2..16741aa2d7 100644
--- a/erts/emulator/beam/beam_emu.c
+++ b/erts/emulator/beam/beam_emu.c
@@ -1520,6 +1520,17 @@ void process_main(void)
      NextPF(1, next);
  }
 
+ OpCase(move_x1_c): {
+	x(1) = Arg(0);
+	Next(1);
+    }
+
+ OpCase(move_x2_c): {
+	x(2) = Arg(0);
+	Next(1);
+    }
+
+
  OpCase(return): {
     SET_I(c_p->cp);
     /*
diff --git a/erts/emulator/beam/ops.tab b/erts/emulator/beam/ops.tab
index ac63b352ef..e861f97e7a 100644
--- a/erts/emulator/beam/ops.tab
+++ b/erts/emulator/beam/ops.tab
@@ -291,6 +291,12 @@ move X1=x Y1=y | move X2=x Y2=y => move2 X1 Y1 X2 Y2
 move Y1=y X1=x | move Y2=y X2=x => move2 Y1 X1 Y2 X2
 move X1=x X2=x | move X3=x X4=x => move2 X1 X2 X3 X4
 
+move C=aiq X=x==1 => move_x1 C
+move C=aiq X=x==2 => move_x2 C
+
+move_x1 c
+move_x2 c
+
 %macro: move2 Move2 -pack
 move2 x y x y
 move2 y x y x
-- 
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