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59 lines
962 B
ArmAsm
59 lines
962 B
ArmAsm
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; Ullrich von Bassewitz, 25.10.2000
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; CC65 runtime: Convert tos from int to long
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;
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.export tosulong, toslong
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.import decsp2
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.importzp sp
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; Convert TOS from int to long
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tosulong:
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pha
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jsr decsp2 ; Make room
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ldy #2
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lda (sp),y
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.ifpc02
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sta (sp) ; 65C02 version
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iny ; Y = 3
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.else
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ldy #0
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sta (sp),y
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ldy #3
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.endif
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lda (sp),y
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toslong1:
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ldy #1
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sta (sp),y
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lda #0 ; Zero extend
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toslong2:
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iny
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sta (sp),y
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iny
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sta (sp),y
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pla
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rts
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toslong:
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pha
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jsr decsp2 ; Make room
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ldy #2
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lda (sp),y
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.ifpc02
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sta (sp) ; 65C02 version
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iny ; Y = 3
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.else
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ldy #0
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sta (sp),y
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ldy #3
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.endif
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lda (sp),y
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bpl toslong1 ; Jump if positive, high word is zero
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ldy #1
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sta (sp),y
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lda #$FF
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bne toslong2 ; Branch always
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