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|
;--------------------------------------------------------------------------
; __mulsint2slong.s
;
; Copyright (C) 2016, Philipp Klaus Krause
;
; 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 ___mulsint2slong
.globl ___muluint2ulong
.area CODE
___muluint2ulong:
clr a
ldw x, (5, sp)
jra right_nonneg
___mulsint2slong:
; Handle signed operands
clr a
ldw x, (3, sp)
jrpl left_nonneg
cpl a
negw x
ldw (3, sp), x
left_nonneg:
ldw x, (5, sp)
jrpl right_nonneg
cpl a
negw x
ldw (5, sp), x
right_nonneg:
sub sp, #4
push a
; Multiply lower bytes
ld a, (5+4, sp)
mul x, a
ldw (4, sp), x
; Multiply upper bytes
ldw x, (5+2, sp)
ld a, (5+5, sp)
mul x, a
ldw (2, sp), x
; Multiply middle bytes
ld a, (5+5, sp)
jreq skip_m1
ldw x, (5+3, sp)
mul x, a
addw x, (3, sp)
ldw (3, sp), x
ld a, (2, sp)
adc a, #0
ld (2, sp), a
skip_m1:
ld a, (5+3, sp)
jreq skip_m2
ldw x, (5+5, sp)
mul x, a
addw x, (3, sp)
ldw (3, sp), x
ld a, (2, sp)
adc a, #0
ld (2, sp), a
skip_m2:
; Handle signed result
pop a
popw y
popw x
tnz a
jrpl end
negw x
jrnc neg_y
incw y
neg_y:
negw y
end:
ret
|
