Forgot to add the new file :-P 2017-10-13 Sebastian Perta <sebastian.perta@renesas.com>

Forgot to add the new file :-P
2017-10-13  Sebastian Perta  <sebastian.perta@renesas.com>
* config/rl78/adddi3.S: New assembly file.
* config/rl78/t-rl78: Added adddi3.S to LIB2ADD.

From-SVN: r254016

libgcc/config/rl78/adddi3.S

+;   Copyright (C) 2017 Free Software Foundation, Inc.
+;   Contributed by Sebastian Perta.
+;
+; This file 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, or (at your option) any
+; later version.
+;
+; This file 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.
+;
+; Under Section 7 of GPL version 3, you are granted additional
+; permissions described in the GCC Runtime Library Exception, version
+; 3.1, as published by the Free Software Foundation.
+;
+; You should have received a copy of the GNU General Public License and
+; a copy of the GCC Runtime Library Exception along with this program;
+; see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+; <http://www.gnu.org/licenses/>.
+
+
+#include "vregs.h"
+
+    .text
+
+START_FUNC ___adddi3
+
+    movw  hl, sp       ; use HL-based addressing (allows for direct addw)
+
+    movw  ax, [hl+4]
+    addw  ax, [hl+12]
+    movw  r8, ax
+
+    mov   a, [hl+6]    ; middle bytes of the result are determined using 8-bit
+    addc  a, [hl+14]   ; ADDC insns which both account for and update the carry bit
+    mov   r10, a       ; (no ADDWC instruction is available)
+    mov   a, [hl+7]
+    addc  a, [hl+15]
+    mov   r11, a
+
+    mov   a, [hl+8]
+    addc  a, [hl+16]
+    mov   r12, a
+    mov   a, [hl+9]
+    addc  a, [hl+17]
+    mov   r13, a
+
+    movw  ax, [hl+10]
+    sknc               ; account for the possible carry from the
+    incw  ax           ; latest 8-bit operation
+    addw  ax, [hl+18]
+    movw  r14, ax
+
+    ret
+
+END_FUNC ___adddi3