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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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