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; Copyright (C) 2017-2020 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
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