38 lines
716 B
ArmAsm
38 lines
716 B
ArmAsm
;
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; Ullrich von Bassewitz, 05.08.1998
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; Christian Krueger, 11-Mar-2017, added 65SC02 optimization
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;
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; CC65 runtime: sub ints reversed
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;
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.export tosrsuba0, tosrsubax
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.import addysp1
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.importzp spc, tmp1
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.macpack cpu
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;
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; AX = AX - TOS
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;
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tosrsuba0:
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ldx #0
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tosrsubax:
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sec
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.if (.cpu .bitand CPU_ISET_65SC02)
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sbc (spc)
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ldy #1
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.else
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ldy #0
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sbc (spc),y ; lo byte
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iny
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.endif
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sta tmp1 ; save lo byte
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txa
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sbc (spc),y ; hi byte
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tax
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lda tmp1
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jmp addysp1 ; drop TOS, set condition codes
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