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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 |
| |
| ld temp0, Y+ |
| ld temp1, Y+ |
| ld temp2, Y+ |
| ld temp3, Y+ |
| |
| ;; unsigned 32/16 -> 16r16 divide |
| |
| PFA_UMSLASHMODmod: |
| |
| ; set loop counter |
| ldi temp6,$10 |
| |
| PFA_UMSLASHMODmod_loop: |
| ; shift left, saving high bit |
| clr temp7 |
| lsl temp0 |
| rol temp1 |
| rol temp2 |
| rol temp3 |
| rol temp7 |
| |
| ; try subtracting divisor |
| cp temp2, temp4 |
| cpc temp3, temp5 |
| cpc temp7,zerol |
| |
| brcs PFA_UMSLASHMODmod_loop_control |
| |
| PFA_UMSLASHMODmod_subtract: |
| ; dividend is large enough |
| ; do the subtraction for real |
| ; and set lowest bit |
| inc temp0 |
| sub temp2, temp4 |
| sbc temp3, temp5 |
| |
| PFA_UMSLASHMODmod_loop_control: |
| dec temp6 |
| brne PFA_UMSLASHMODmod_loop |
| |
| PFA_UMSLASHMODmod_done: |
| ; put remainder on stack |
| st -Y,temp3 |
| st -Y,temp2 |
| |
| ; put quotient on stack |
| movw tosl, temp0 |
| jmp DO_NEXT |
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