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cc65/libsrc/runtime/lcompl.s
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ArmAsm

;
; Ullrich von Bassewitz, 06.08.1998
;
; CC65 runtime: long complement
;
.export compleax
.importzp sreg
; eax = ~eax
compleax:
eor #$FF
pha
txa
eor #$FF
tax
lda sreg
eor #$FF
sta sreg
lda sreg+1
eor #$FF
sta sreg+1
pla
rts