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45 lines
722 B
ArmAsm

;
; Ullrich von Bassewitz, 05.08.1998
;
; CC65 runtime: long add
;
.export tosadd0ax, tosaddeax
.import addysp1
.importzp sp, sreg, tmp1
.macpack cpu
; EAX = TOS + EAX
tosadd0ax:
ldy #$00
sty sreg
sty sreg+1
tosaddeax:
clc
.if (.cpu .bitand CPU_ISET_65SC02)
adc (sp) ; 65SC02 version - saves 2 cycles
ldy #1
.else
ldy #0
adc (sp),y ; lo byte
iny
.endif
sta tmp1 ; use as temp storage
txa
adc (sp),y ; byte 1
tax
iny
lda sreg
adc (sp),y ; byte 2
sta sreg
iny
lda sreg+1
adc (sp),y ; byte 3
sta sreg+1
lda tmp1 ; load byte 0
jmp addysp1 ; drop TOS