29 lines
426 B
ArmAsm
29 lines
426 B
ArmAsm
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.define Rmi4
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! This subroutine returns the remainder of a fourbyte division.
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Rmi4:
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ldy #0
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sty NBYTES ! for the sign of the result
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ldy #0
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sty UNSIGN ! it is signed arithmetic
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jsr Div4
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lsr ARTH+11
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ror ARTH+10
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ror ARTH+9
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ror ARTH+8 ! result must be shifted one time
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ldy NBYTES
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beq 1f ! result is positive
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lda #0
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ldx #ARTH+8
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jsr Ngi4
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1: lda ARTH+11
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ldx ARTH+10
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jsr Push
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lda ARTH+9
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ldx ARTH+8
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jmp Push
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