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|
;--------------------------------------------------------------------------
; _mullong.s
;
; Copyright (C) 2014, Ben Shi
;
; This library 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 2, or (at your option) any
; later version.
;
; This library 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 library; see the file COPYING. If not, write to the
; Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston,
; MA 02110-1301, USA.
;
; As a special exception, if you link this library with other files,
; some of which are compiled with SDCC, to produce an executable,
; this library does not by itself cause the resulting executable to
; be covered by the GNU General Public License. This exception does
; not however invalidate any other reasons why the executable file
; might be covered by the GNU General Public License.
;--------------------------------------------------------------------------
.globl __mullong
.area CODE
__mullong:
clrw x
pushw x
pushw x
__mullong_0:
ld a, (#10, sp)
ld xl, a
ld a, (#14, sp)
mul x, a
ldw (#3, sp), x
__mullong_1:
ld a, (#9, sp)
ld xl, a
ld a, (#14, sp)
mul x, a
addw x, (#2, sp)
ldw (#2, sp), x
clr a
adc a, #0
ld (#1, sp), a
ld a, (#10, sp)
ld xl, a
ld a, (#13, sp)
mul x, a
addw x, (#2, sp)
ldw (#2, sp), x
clr a
adc a, (#1, sp)
ld (#1, sp), a
__mullong_2:
ld a, (#10, sp)
ld xl, a
ld a, (#12, sp)
mul x, a
addw x, (#1, sp)
ldw (#1, sp), x
ld a, (#9, sp)
ld xl, a
ld a, (#13, sp)
mul x, a
addw x, (#1, sp)
ldw (#1, sp), x
ld a, (#8, sp)
ld xl, a
ld a, (#14, sp)
mul x, a
addw x, (#1, sp)
ldw (#1, sp), x
__mullong_3:
ld a, (#7, sp)
ld xl, a
ld a, (#14, sp)
mul x, a
ld a, xl
add a, (#1, sp)
ld (#1, sp), a
ld a, (#10, sp)
ld xl, a
ld a, (#11, sp)
mul x, a
ld a, xl
add a, (#1, sp)
ld (#1, sp), a
ld a, (#9, sp)
ld xl, a
ld a, (#12, sp)
mul x, a
ld a, xl
add a, (#1, sp)
ld (#1, sp), a
ld a, (#8, sp)
ld xl, a
ld a, (#13, sp)
mul x, a
ld a, xl
add a, (#1, sp)
ld (#1, sp), a
__mullong_4:
popw y
popw x
ret
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