73 lines
904 B
ArmAsm
73 lines
904 B
ArmAsm
|
.define .mli4
|
||
|
|
|
||
|
|
! 32 bits signed and unsigned integer multiply routine
|
||
|
|
! Expects operands on stack
|
||
|
|
! Yields product on stack
|
||
|
|
|
||
|
|
.mli4: pop h
|
||
|
|
shld .retadr
|
||
|
|
mov h,b
|
||
|
|
mov l,c
|
||
|
|
shld .bcreg
|
||
|
|
|
||
|
|
pop h ! store multiplier
|
||
|
|
shld block1
|
||
|
|
pop h
|
||
|
|
shld block1+2
|
||
|
|
pop h ! store multiplicand
|
||
|
|
shld block2
|
||
|
|
pop h
|
||
|
|
shld block2+2
|
||
|
|
lxi h,0
|
||
|
|
shld block3 ! product = 0
|
||
|
|
shld block3+2
|
||
|
|
lxi b,0
|
||
|
|
lp1: lxi h,block1
|
||
|
|
dad b
|
||
|
|
mov a,m ! get next byte of multiplier
|
||
|
|
mvi b,8
|
||
|
|
lp2: rar
|
||
|
|
jnc 2f
|
||
|
|
lhld block2 ! add multiplicand to product
|
||
|
|
xchg
|
||
|
|
lhld block3
|
||
|
|
dad d
|
||
|
|
shld block3
|
||
|
|
lhld block2+2
|
||
|
|
jnc 1f
|
||
|
|
inx h
|
||
|
|
1: xchg
|
||
|
|
lhld block3+2
|
||
|
|
dad d
|
||
|
|
shld block3+2
|
||
|
|
|
||
|
|
2: lhld block2 ! shift multiplicand left
|
||
|
|
dad h
|
||
|
|
shld block2
|
||
|
|
lhld block2+2
|
||
|
|
jnc 3f
|
||
|
|
dad h
|
||
|
|
inx h
|
||
|
|
jmp 4f
|
||
|
|
3: dad h
|
||
|
|
4: shld block2+2
|
||
|
|
|
||
|
|
dcr b
|
||
|
|
jnz lp2
|
||
|
|
|
||
|
|
inr c
|
||
|
|
mov a,c
|
||
|
|
cpi 4
|
||
|
|
jnz lp1
|
||
|
|
|
||
|
|
lhld block3+2
|
||
|
|
push h
|
||
|
|
lhld block3
|
||
|
|
push h
|
||
|
|
|
||
|
|
lhld .bcreg
|
||
|
|
mov b,h
|
||
|
|
mov c,l
|
||
|
|
lhld .retadr
|
||
|
|
pchl
|