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cc65/libsrc/runtime/incsp6.s

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;
; Ullrich von Bassewitz, 2003-05-04
;
; CC65 runtime: Increment the stackpointer by 6
;
.export incsp6
.importzp sp
.proc incsp6
lda sp
clc
adc #6
sta sp
bcs @L1
rts
@L1: inc sp+1
rts
.endproc