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cc65/libsrc/runtime/bneg.s

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;
; Ullrich von Bassewitz, 05.08.1998
;
; CC65 runtime: boolean negation
;
.export bnega, bnegax
.import return0, return1
bnegax: cpx #0
bne L0
bnega: tax
bne L0
L1: lda #1 ; Zero already in X
rts
L0: ldx #0
txa
rts