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<h1> words/umslashmod.asm </h1> |
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<pre> |
; ( ud u2 -- rem quot) Arithmetics |
; R( -- ) |
; unsigned division ud / u2 with remainder |
VE_UMSLASHMOD: |
.db $06, "um/mod",0 |
.dw VE_HEAD |
.set VE_HEAD = VE_UMSLASHMOD |
XT_UMSLASHMOD: |
.dw PFA_UMSLASHMOD |
PFA_UMSLASHMOD: |
movw temp4, tosl |
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ld temp0, Y+ |
ld temp1, Y+ |
ld temp2, Y+ |
ld temp3, Y+ |
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;; unsigned 32/16 -> 16r16 divide |
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PFA_UMSLASHMODmod: |
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; set loop counter |
ldi temp6,$10 |
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PFA_UMSLASHMODmod_loop: |
; shift left, saving high bit |
clr temp7 |
lsl temp0 |
rol temp1 |
rol temp2 |
rol temp3 |
rol temp7 |
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; try subtracting divisor |
cp temp2, temp4 |
cpc temp3, temp5 |
cpc temp7,zerol |
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brcs PFA_UMSLASHMODmod_loop_control |
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PFA_UMSLASHMODmod_subtract: |
; dividend is large enough |
; do the subtraction for real |
; and set lowest bit |
inc temp0 |
sub temp2, temp4 |
sbc temp3, temp5 |
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PFA_UMSLASHMODmod_loop_control: |
dec temp6 |
brne PFA_UMSLASHMODmod_loop |
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PFA_UMSLASHMODmod_done: |
; put remainder on stack |
st -Y,temp3 |
st -Y,temp2 |
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; put quotient on stack |
movw tosl, temp0 |
jmp DO_NEXT |
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