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52 lines
1.0 KiB
ArmAsm
52 lines
1.0 KiB
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: long sub reversed
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;
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;
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; EAX = EAX - TOS
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;
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.export tosrsub0ax, tosrsubeax
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.import addysp1
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.importzp sp, sreg, tmp1
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.macpack cpu
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tosrsub0ax:
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.if (.cpu .bitand ::CPU_ISET_65SC02)
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stz sreg
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stz sreg+1
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.else
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ldy #$00
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sty sreg
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sty sreg+1
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.endif
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tosrsubeax:
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sec
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.if (.cpu .bitand ::CPU_ISET_65SC02)
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sbc (sp)
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ldy #1
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.else
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ldy #0
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sbc (sp),y ; byte 0
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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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sbc (sp),y ; byte 1
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tax
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iny
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lda sreg
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sbc (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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sbc (sp),y ; byte 3
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sta sreg+1
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lda tmp1
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jmp addysp1 ; drop TOS
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