43 lines
540 B
ArmAsm
43 lines
540 B
ArmAsm
.define .xor
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.sect .text
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.sect .rom
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.sect .data
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.sect .bss
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.sect .text
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! Any size exclusive-or.
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! Expects: size in de-registers
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! operands on stack
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! Yields: result on stack
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.xor: pop h
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shld .retadr
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mov h,b
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mov l,c
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shld .bcreg
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lxi h,0
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dad sp
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mov c,l
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mov b,h !now bc points to top of first operand
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dad d !and hl points to top of second operand
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push h !this will be the new stackpointer
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1: ldax b
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xra m
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mov m,a
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inx h
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inx b
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dcx d
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mov a,e
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ora d
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jnz 1b
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pop h
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sphl
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lhld .bcreg
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mov b,h
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mov c,l
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lhld .retadr
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pchl
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