59 lines
1.8 KiB
ArmAsm
59 lines
1.8 KiB
ArmAsm
; Copyright (C) 2017-2019 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
|