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| <h1> words/mstar.asm </h1> |
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| <pre> |
| ; ( n1 n2 -- d) Arithmetics |
| ; R( -- ) |
| ; multiply 2 cells to a double cell |
| VE_MSTAR: |
| .db $02, "m*",0 |
| .dw VE_HEAD |
| .set VE_HEAD = VE_MSTAR |
| XT_MSTAR: |
| .dw PFA_MSTAR |
| PFA_MSTAR: |
| movw temp0, tosl |
| loadtos |
| ; result: (temp3*temp1)* 65536 + (temp3*temp0 + temp1*temp2) * 256 + (temp0 * temp2) |
| ; low bytes |
| mul tosl,temp0 |
| movw zl, r0 |
| clr temp2 |
| clr temp3 |
| ; middle bytes |
| mul tosh, temp0 |
| add zh, r0 |
| adc temp2, r1 |
| adc temp3, zeroh |
| |
| mul tosl, temp1 |
| add zh, r0 |
| adc temp2, r1 |
| adc temp3, zeroh |
| |
| mul tosh, temp1 |
| add temp2, r0 |
| adc temp3, r1 |
| movw tosl, temp2 |
| savetos |
| movw tosl, zl |
| jmp DO_NEXT |
| </pre> |
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