From 3694076f5a68cc78e9ccd6c67651bc0f761fc94f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B6rn=20Gustavsson?= <bjorn@erlang.org>
Date: Tue, 7 Dec 2010 13:57:24 +0100
Subject: Eliminate use of GetArg2() in the i_element instruction

Use separate instructions for each register type.
---
 erts/emulator/beam/beam_emu.c  | 48 ++++++++++++++++++++++++++----------------
 erts/emulator/beam/beam_load.c |  6 +++---
 erts/emulator/beam/ops.tab     |  4 +++-
 3 files changed, 36 insertions(+), 22 deletions(-)

(limited to 'erts/emulator')

diff --git a/erts/emulator/beam/beam_emu.c b/erts/emulator/beam/beam_emu.c
index bdc730e6c1..fdb7d86c78 100644
--- a/erts/emulator/beam/beam_emu.c
+++ b/erts/emulator/beam/beam_emu.c
@@ -1467,24 +1467,36 @@ void process_main(void)
      goto find_func_info;
  }
 
- OpCase(i_element_jssd): {
-     Eterm index;
-     Eterm tuple;
-
-     /*
-      * Inlined version of element/2 for speed.
-      */
-     GetArg2(1, index, tuple);
-     if (is_small(index) && is_tuple(tuple)) {
-	 Eterm* tp = tuple_val(tuple);
-
-	 if ((signed_val(index) >= 1) &&
-	     (signed_val(index) <= arityval(*tp))) {
-	     Eterm result = tp[signed_val(index)];
-	     StoreBifResult(3, result);
-	 }
-     }
- }
+    {
+	Eterm element_index;
+	Eterm element_tuple;
+
+    OpCase(i_element_xjsd):
+	element_tuple = xb(Arg(0));
+	I++;
+	goto do_element;
+
+    OpCase(i_element_yjsd):
+	element_tuple = yb(Arg(0));
+	I++;
+	goto do_element;
+
+    OpCase(i_element_rjsd):
+	element_tuple = r(0);
+	/* Fall through */
+
+    do_element:
+	GetArg1(1, element_index);
+	if (is_small(element_index) && is_tuple(element_tuple)) {
+	    Eterm* tp = tuple_val(element_tuple);
+
+	    if ((signed_val(element_index) >= 1) &&
+		(signed_val(element_index) <= arityval(*tp))) {
+		Eterm result = tp[signed_val(element_index)];
+		StoreBifResult(2, result);
+	    }
+	}
+    }
  /* Fall through */
 
  OpCase(badarg_j):
diff --git a/erts/emulator/beam/beam_load.c b/erts/emulator/beam/beam_load.c
index 4233e26f54..02aef95a52 100644
--- a/erts/emulator/beam/beam_load.c
+++ b/erts/emulator/beam/beam_load.c
@@ -2321,9 +2321,9 @@ gen_element(LoaderState* stp, GenOpArg Fail, GenOpArg Index,
 	op->a[3] = Dst;
     } else {
 	op->op = genop_i_element_4;
-	op->a[0] = Fail;
-	op->a[1] = Index;
-	op->a[2] = Tuple;
+	op->a[0] = Tuple;
+	op->a[1] = Fail;
+	op->a[2] = Index;
 	op->a[3] = Dst;
     }
 
diff --git a/erts/emulator/beam/ops.tab b/erts/emulator/beam/ops.tab
index 491f8f1d90..edc44f966b 100644
--- a/erts/emulator/beam/ops.tab
+++ b/erts/emulator/beam/ops.tab
@@ -924,7 +924,9 @@ i_fast_element r j I d
 i_fast_element x j I d
 i_fast_element y j I d
 
-i_element j s s d
+i_element r j s d
+i_element x j s d
+i_element y j s d
 
 bif1 f b s d
 bif1_body b s d
-- 
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