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cc65/libsrc/runtime/leasp.s

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;
; Ullrich von Bassewitz, 21.08.1998
;
; CC65 runtime: Load effective address with offset in Y relative to SP
;
.export leaasp, plea0sp, pleaysp
.import pushax
.importzp sp
leaasp: ldx sp+1 ; Get high byte
clc
adc sp
bcc @L1
inx
@L1: rts
plea0sp:
ldy #0
pleaysp:
tya
ldx sp+1 ; Get high byte
clc
adc sp
bcc L9
inx
L9: jmp pushax