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43 lines
904 B
ArmAsm
43 lines
904 B
ArmAsm
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; Ullrich von Bassewitz, 05.08.1998
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; CC65 runtime: long add
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.export tosadd0ax, tosaddeax
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.import addysp1
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.importzp c_sp, sreg, tmp1
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; EAX = TOS + EAX
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tosadd0ax:
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ldy #$00
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sty sreg
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sty sreg+1
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tosaddeax:
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clc
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.if .cap(CPU_HAS_ZPIND)
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adc (c_sp) ; 65SC02 version - saves 2 cycles
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ldy #1
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.else
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ldy #0
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adc (c_sp),y ; lo byte
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iny
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.endif
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sta tmp1 ; use as temp storage
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txa
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adc (c_sp),y ; byte 1
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tax
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iny
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lda sreg
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adc (c_sp),y ; byte 2
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sta sreg
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iny
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lda sreg+1
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adc (c_sp),y ; byte 3
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sta sreg+1
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lda tmp1 ; load byte 0
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jmp addysp1 ; drop TOS
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