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cc65/libsrc/runtime/neg.s
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ArmAsm

;
; Ullrich von Bassewitz, 05.08.1998
;
; CC65 runtime: negation on ints
;
.export negax
negax: clc
eor #$FF
adc #1
pha
txa
eor #$FF
adc #0
tax
pla
rts