rl78.c (rl78_addsi3_internal): New function.

	* config/rl78/rl78.c (rl78_addsi3_internal): New function.
	Optimizes the case where -mes0 is active and a constant symbolic
	address is used.
	* config/rl78/rl78-protos.h: Prototype the new function.
	* config/rl78/rl78.md (addsi3_internal_real): Call new function.

From-SVN: r226306

gcc/ChangeLog

+2015-07-28  Nick Clifton  <nickc@redhat.com>
+
+	* config/rl78/rl78.c (rl78_addsi3_internal): New function.
+	Optimizes the case where -mes0 is active and a constant symbolic
+	address is used.
+	* config/rl78/rl78-protos.h: Prototype the new function.
+	* config/rl78/rl78.md (addsi3_internal_real): Call new function.
+
 2015-07-28  Tom de Vries  <tom@codesourcery.com>
 
 	* tree-parloops.c (reduc_stmt_res): New function.

gcc/config/rl78/rl78-protos.h

@@ -18,6 +18,7 @@
    along with GCC; see the file COPYING3.  If not see
    <http://www.gnu.org/licenses/>.  */
 
+const char *    rl78_addsi3_internal (rtx *, unsigned int);
 void		rl78_emit_eh_epilogue (rtx);
 void		rl78_expand_compare (rtx *);
 void		rl78_expand_movsi (rtx *);

gcc/config/rl78/rl78.c

@@ -357,6 +357,9 @@ rl78_option_override (void)
 
   if (TARGET_ES0
       && strcmp (lang_hooks.name, "GNU C")
+      && strcmp (lang_hooks.name, "GNU C11")
+      && strcmp (lang_hooks.name, "GNU C89")
+      && strcmp (lang_hooks.name, "GNU C99")
       /* Compiling with -flto results in a language of GNU GIMPLE being used... */
       && strcmp (lang_hooks.name, "GNU GIMPLE"))
     /* Address spaces are currently only supported by C.  */
@@ -4638,6 +4641,33 @@ rl78_flags_already_set (rtx op, rtx operand)
 
   return res;
 }
+
+const char *
+rl78_addsi3_internal (rtx * operands, unsigned int alternative)
+{
+  /* If we are adding in a constant symbolic address when -mes0
+     is active then we know that the address must be <64K and
+     that it is invalid to access anything above 64K relative to
+     this address.  So we can skip adding in the high bytes.  */
+  if (TARGET_ES0
+      && GET_CODE (operands[2]) == SYMBOL_REF
+      && TREE_CODE (SYMBOL_REF_DECL (operands[2])) == VAR_DECL
+      && TREE_READONLY (SYMBOL_REF_DECL (operands[2]))
+      && ! TREE_SIDE_EFFECTS (SYMBOL_REF_DECL (operands[2])))
+    return "movw ax, %h1\n\taddw ax, %h2\n\tmovw %h0, ax";
+
+  switch (alternative)
+    {
+    case 0:
+    case 1:
+      return "movw ax, %h1\n\taddw ax, %h2\n\tmovw %h0, ax\n\tmovw ax, %H1\n\tsknc\n\tincw ax\n\taddw ax, %H2\n\tmovw %H0, ax";
+    case 2:
+      return "movw ax, %h1\n\taddw ax,%h2\n\tmovw bc, ax\n\tmovw ax, %H1\n\tsknc\n\tincw ax\n\taddw ax, %H2\n\tmovw %H0, ax\n\tmovw ax, bc\n\tmovw %h0, ax";
+    default:
+      gcc_unreachable ();
+    }
+}
+
 
 #undef  TARGET_PREFERRED_RELOAD_CLASS
 #define TARGET_PREFERRED_RELOAD_CLASS rl78_preferred_reload_class

gcc/config/rl78/rl78.md

@@ -243,10 +243,7 @@
    (clobber (reg:HI BC_REG))
    ]
   "rl78_real_insns_ok ()"
-  "@
-   movw ax,%h1 \;addw ax,%h2 \;movw %h0, ax \;movw ax,%H1 \;sknc \;incw ax \;addw ax,%H2 \;movw %H0,ax
-   movw ax,%h1 \;addw ax,%h2 \;movw %h0, ax \;movw ax,%H1 \;sknc \;incw ax \;addw ax,%H2 \;movw %H0,ax
-   movw ax,%h1 \;addw ax,%h2 \;movw bc,  ax \;movw ax,%H1 \;sknc \;incw ax \;addw ax,%H2 \;movw %H0,ax \;movw ax,bc \;movw %h0, ax"
+  { return rl78_addsi3_internal (operands, which_alternative); }
   [(set_attr "valloc" "macax")]
 )