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cc65/libsrc/runtime/lswap.s

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;
; Ullrich von Bassewitz, 29.12.1999
;
; CC65 runtime: Exchange lo and hi part of eax
;
.export swapeax
.importzp sreg
swapeax:
ldy sreg
sta sreg
lda sreg+1
stx sreg+1
tax
tya
rts