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It's not because Y must equal zero on rts that we should'nt spare one byte and one cycle.
26 lines
760 B
ArmAsm
26 lines
760 B
ArmAsm
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; Christian Kruger, 20-May-2018
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; CC65 runtime: Pop 2 bytes from stack to ptr1.
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; X is untouched, low byte in A, Y is defined to be 0!
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.export popptr1
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.import incsp2
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.importzp sp, ptr1
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.macpack cpu
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.proc popptr1 ; 14 bytes (four usages = at least 2 bytes saved)
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ldy #1
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lda (sp),y ; get hi byte
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sta ptr1+1 ; into ptr hi
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dey ; dey even for for 65C02 here to have Y=0 at exit!
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.if (.cpu .bitand ::CPU_ISET_65SC02)
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lda (sp) ; get lo byte
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.else
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lda (sp),y ; get lo byte
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.endif
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sta ptr1 ; to ptr lo
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jmp incsp2
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.endproc
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