From b58b4718012cfb848dad3106b2ab22c08997c639 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B6rn-Egil=20Dahlberg?= <egil@erlang.org>
Date: Thu, 23 Apr 2015 19:21:34 +0200
Subject: erts: Specialize rem instruction for common case

* i_rem specialization on x registers
---
 erts/emulator/beam/beam_emu.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'erts/emulator/beam/beam_emu.c')

diff --git a/erts/emulator/beam/beam_emu.c b/erts/emulator/beam/beam_emu.c
index aca340db6b..f369d7b632 100644
--- a/erts/emulator/beam/beam_emu.c
+++ b/erts/emulator/beam/beam_emu.c
@@ -2902,6 +2902,19 @@ do {								\
         goto lb_Cl_error;                \
     } while(0)
 
+ OpCase(i_rem_jIxxd):
+ {
+     Eterm result;
+
+     if (xb(Arg(3)) == SMALL_ZERO) {
+	 goto badarith;
+     } else if (is_both_small(xb(Arg(2)), xb(Arg(3)))) {
+	 result = make_small(signed_val(xb(Arg(2))) % signed_val(xb(Arg(3))));
+         StoreBifResult(4, result);
+     }
+     DO_BIG_ARITH(ARITH_FUNC(int_rem),xb(Arg(2)),xb(Arg(3)));
+ }
+
  OpCase(i_rem_jId):
  {
      Eterm result;
-- 
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