source: liacs/ca/opdr2b/src/rfac.s@ 6

Last change on this file since 6 was 2, checked in by Rick van der Zwet, 15 years ago

Initial import of data of old repository ('data') worth keeping (e.g. tracking
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  • Property svn:executable set to *
File size: 739 bytes
Line 
1# Dit programma berekent fac(x) voor x=1,...,6, en plaatst de resultaten
2# in mem[200],...,mem[212]. fac(x) = 1.2. ... .x, fac(3)=1.2.3=6.
3
4main:
5 addi $7,$0,1 # fac(1) = 1
6 addi $5,$0,200 # init base data adress
7 sh $7,0($5) # init fac(1) in mem
8 nop
9 addi $4,$0,2 # init x=2
10
11loop:
12 lh $7,0($5) # fac(x-1)
13 nop
14 add $2,$0,$0 # clear
15 add $3,$0,$0 # init mult teller op 0
16IL:
17 add $2,$2,$7 # fac(x) := fac(x) + fac(x-1)
18 addi $3,$3,1 # mult := mult + 1
19 slt $10,$3,$4 # if mult=x then fac(x) is
20 bne $0,$10, IL # calculated
21 nop
22
23 sh $2,2($5) # store fac(x) in mem
24
25 addi $4,$4,1 # inc(x)
26 addi $5,$5,2
27 slti $10,$5,212
28 bne $0,$10, loop # if not yet all fac(.) calculated
29 nop # then loop
30
31 break 0
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