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24 lines
571 B
ArmAsm
24 lines
571 B
ArmAsm
;
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; Ullrich von Bassewitz, 07.08.1998
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; CC65 runtime: modulo operation for signed ints
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;
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; When negating values, we will ignore the possibility here, that one of the
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; values if $8000, in which case the negate will fail.
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.export tosmoda0, tosmodax
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.import popsargs, udiv16, adjsres
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.importzp ptr1
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tosmoda0:
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ldx #0
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tosmodax:
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jsr popsargs ; Get arguments from stack, adjust sign
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jsr udiv16 ; Do the division
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lda ptr1 ; Result is in sreg, remainder in ptr1
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ldx ptr1+1
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jmp adjsres ; Adjust the sign of the result if needed
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