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test_djs.spin
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test_djs.spin
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dat
orgh 0
org 0
andn outb, ##$FFFF
or dirb, ##$FFFF
call #test1 ' Normal decrement from large non-negative
call #test2 ' Decrement starting at zero
call #test3 ' Decrement starting from 1
.end jmp #.end
'-------------------------------------------------------------------------------
test1 setcz #%00 wc, wz
mov d, ##$80_00_00_01
mov c, #0
.loop add c, #1
djs d, #.loop ' TEST INSTRUCTION
setbc cz, #1
setbz cz, #0
cmp d, ##$7F_FF_FF_FF wz
if_nz jmp #.end
cmp c, #2 wz
if_nz jmp #.end
cmp cz, #%00 wz
if_nz jmp #.end
setb outb, #0
.end ret
'-------------------------------------------------------------------------------
test2 setcz #%01 wc, wz
mov d, #0
mov c, #11
.loop sub c, #1
tjz c, #.continue
djs d, #.loop ' TEST INSTRUCTION
.continue setbc cz, #1
setbz cz, #0
cmp d, ##-10 wz
if_nz jmp #.end
cmp c, #0 wz
if_nz jmp #.end
cmp cz, #%01 wz
if_nz jmp #.end
setb outb, #1
.end ret
'-------------------------------------------------------------------------------
test3 setcz #%10 wc, wz
mov d, #1
mov c, #0
.loop add c, #1
djs d, #.loop ' TEST INSTRUCTION
setbc cz, #1
setbz cz, #0
cmp d, #0 wz
if_nz jmp #.end
cmp c, #1 wz
if_nz jmp #.end
cmp cz, #%10 wz
if_nz jmp #.end
setb outb, #2
.end ret
'-------------------------------------------------------------------------------
d res 1
c res 1
cz res 1
r res 1
rc res 1
rcz res 1