Index: gcc/config/rl78/rl78.c
===================================================================
--- gcc/config/rl78/rl78.c	(revision 226548)
+++ gcc/config/rl78/rl78.c	(working copy)
@@ -608,13 +608,6 @@
   int did = 0;
   rtx temp_reg = NULL;
 
-  /* As an exception, we allow two far operands if they're identical
-     and the third operand is not a MEM.  This allows global variables
-     to be incremented, for example.  */
-  if (rtx_equal_p (operands[0], operands[1])
-      && ! MEM_P (operands[2]))
-    return 0;
-
   /* FIXME: Likewise.  */
   if (rl78_far_p (operands[1]))
     {
--- /dev/null	2015-08-04 08:05:06.160754276 +0100
+++ gcc/testsuite/gcc.target/rl78/rl78.exp	2015-08-04 14:03:20.759389085 +0100
@@ -0,0 +1,43 @@
+# Copyright (C) 2015 Free Software Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+# 
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+# 
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  
+
+# GCC testsuite that uses the `dg.exp' driver.
+
+# Exit immediately if this isn't the right target.
+if { ![istarget rl78-*-*] } then {
+  return
+}
+
+# Load support procs.
+load_lib gcc-dg.exp
+
+# If a testcase doesn't have special options, use these.
+global DEFAULT_CFLAGS
+if ![info exists DEFAULT_CFLAGS] then {
+    set DEFAULT_CFLAGS ""
+}
+
+# Initialize `dg'.
+dg-init
+
+# Find all tests
+set tests [lsort [find $srcdir/$subdir *.\[cS\]]]
+
+# Main loop.
+gcc-dg-runtest $tests "" $DEFAULT_CFLAGS
+
+# All done.
+dg-finish
--- /dev/null	2015-08-04 08:05:06.160754276 +0100
+++ gcc/testsuite/gcc.target/rl78/test_addm3.c	2015-08-04 15:12:53.509456677 +0100
@@ -0,0 +1,100 @@
+/* Remove `-ansi' from options to enable the use of __far and long long.  */
+/* { dg-options "" } */
+
+#define ADD(TYPE, name)			\
+  TYPE						\
+  add##name(TYPE a, TYPE b)			\
+  {						\
+    return a + b;				\
+  }						\
+  
+#define ADDIMM(TYPE, name)			\
+  TYPE						\
+  addimm##name(TYPE a)				\
+  {						\
+    return a + 50;				\
+  }						\
+
+#define ADDFAR(TYPE, name)			\
+  TYPE __far gf##name;				\
+  void						\
+  addfar##name(TYPE __far *pa, TYPE b)		\
+  {						\
+    gf##name += b;				\
+    *pa += 50;					\
+  }						\
+  
+
+ADD (char, qi3)
+ADD (int, hi3)
+ADD (long, si3)
+ADD (long long, di3)
+ADD (float, sf3)
+ADD (double, df3)
+
+ADDIMM (char, qi3)
+ADDIMM (int, hi3)
+ADDIMM (long, si3)
+ADDIMM (long long, di3)
+ADDIMM (float, sf3)
+ADDIMM (double, df3)
+
+ADDFAR (char, qi3)
+ADDFAR (int, hi3)
+ADDFAR (long, si3)
+ADDFAR (long long, di3)
+ADDFAR (float, sf3)
+ADDFAR (double, df3)
+
+char aqi1, aqi2;
+int ahi1, ahi2;
+long asi1, asi2;
+long long adi1, adi2;
+float af1, af2;
+double ad1, ad2;
+
+void
+testglobal (void)
+{
+  aqi1 += aqi2;
+  ahi1 += ahi2;
+  asi1 += asi2;
+  adi1 += adi2;
+  af1 += af2;
+  ad1 += ad2;
+}
+
+void
+testglobal2 (void)
+{
+  aqi1 += 10;
+  ahi1 += 11;
+  asi1 += 12;
+  adi1 += 13;
+  af1 += 2.0;
+  ad1 += 4.0;
+}
+
+void
+testptr (char *aqi1, int *ahi1, long *asi1, long long *adi1, float *af1, double *ad1, 
+	 char *aqi2, int *ahi2, long *asi2, long long *adi2, float *af2, double *ad2)
+{
+  *aqi1 += *aqi2;
+  *ahi1 += *ahi2;
+  *asi1 += *asi2;
+  *adi1 += *adi2;
+  *af1 += *af2;
+  *ad1 += *ad2;
+}
+
+void
+testptr2 (char *aqi1, int *ahi1, long *asi1, long long *adi1, float *af1, double *ad1)
+{
+  *aqi1 += 5;
+  *ahi1 += 10;
+  *asi1 += 11;
+  *adi1 += 12;
+  *af1 += 4.5;
+  *ad1 += 5.5;
+}
+