38 lines
441 B
ArmAsm
38 lines
441 B
ArmAsm
|
.define .sbi4
|
||
|
|
|
||
|
|
! Subtract two 32 bits signed or unsigned integers.
|
||
|
|
! Expects operands on stack
|
||
|
|
! Yields result on stack
|
||
|
|
|
||
|
|
.sbi4:
|
||
|
|
pop h
|
||
|
|
shld .retadr
|
||
|
|
mov h,b
|
||
|
|
mov l,c
|
||
|
|
shld .bcreg
|
||
|
|
|
||
|
|
lxi h,0
|
||
|
|
dad sp !now hl points to the first operand
|
||
|
|
mov d,h
|
||
|
|
mov e,l
|
||
|
|
inx d
|
||
|
|
inx d
|
||
|
|
inx d
|
||
|
|
inx d !and de points to the second.
|
||
|
|
mvi b,4
|
||
|
|
xra a
|
||
|
|
1: ldax d
|
||
|
|
sbb m
|
||
|
|
stax d
|
||
|
|
inx d
|
||
|
|
inx h
|
||
|
|
dcr b
|
||
|
|
jnz 1b
|
||
|
|
sphl
|
||
|
|
|
||
|
|
lhld .bcreg
|
||
|
|
mov b,h
|
||
|
|
mov c,l
|
||
|
|
lhld .retadr
|
||
|
|
pchl
|