prog8/examples/arithmetic/bitshift.p8

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%import c64utils
%zeropage basicsafe
main {
byte bb
ubyte ub
word ww
uword uw
&ubyte membyte=9999
&uword memword=9999
ubyte[] ubarray = [8,8,8]
uword[] uwarray = [8200, 8200, 8200]
byte[] bbarray = [8,8,8]
word[] wwarray = [8200, 8200, 8200]
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sub unimplemented() {
; TODO implement these asm routines
lsr(ubarray[1])
lsl(ubarray[1])
ror(ubarray[1])
rol(ubarray[1])
ror2(ubarray[1])
rol2(ubarray[1])
lsr(bbarray[1])
lsl(bbarray[1])
lsr(uwarray[1])
lsl(uwarray[1])
ror(uwarray[1])
rol(uwarray[1])
ror2(uwarray[1])
rol2(uwarray[1])
lsr(wwarray[1])
lsl(wwarray[1])
}
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sub start() {
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; TODO call this too: unimplemented()
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lsr(A)
lsl(A)
ror(A)
rol(A)
ror2(A)
rol2(A)
lsr(Y)
lsl(Y)
ror(Y)
rol(Y)
ror2(Y)
rol2(Y)
lsr(bb)
lsl(bb)
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lsr(membyte)
lsl(membyte)
ror(membyte)
rol(membyte)
ror2(membyte)
rol2(membyte)
lsr(memword)
lsl(memword)
ror(memword)
rol(memword)
ror2(memword)
rol2(memword)
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lsl(@(9999))
lsr(@(9999))
ror(@(9999))
rol(@(9999))
ror2(@(9999))
rol2(@(9999))
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lsl(@(9999+A))
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lsr(@(9999+A))
ror(@(9999+A))
rol(@(9999+A))
ror2(@(9999+A))
rol2(@(9999+A))
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bb /= 2
bb >>= 1
bb *= 4
bb <<= 2
ub /= 2
ub >>= 1
ub *= 4
ub <<= 2
rol(ub)
ror(ub)
rol2(ub)
ror2(ub)
ww /= 2
ww >>= 1
ww *= 4
ww <<= 2
uw /= 2
uw >>= 1
uw *= 4
uw <<= 2
rol(uw)
ror(uw)
rol2(uw)
ror2(uw)
check_eval_stack()
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}
sub check_eval_stack() {
c64scr.print("x=")
c64scr.print_ub(X)
if X==255
c64scr.print(" ok\n")
else
c64scr.print(" error!\n")
}
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}