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annotate lib/alib/div16x16.a @ 2765:0bd16cca86b7

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Updated rules.mak for all the os9 format's to format the entire disk. People were having some issues with the disk images not being formatted to their full capacity and preventing some functions from working.
author drencor-xeen
date Thu, 17 Jan 2013 11:03:26 -0600
parents 7d70b7e1cb21
children aaba193af04f
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2474
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1 *********************************************
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2 * 16 x 16 bit integer divide
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3
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4 * OTHER MODULES NEEDED: none
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5
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6 * ENTRY: D = divisor
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7 * X = dividend
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8
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9 * EXIT: X = quotient
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10 * D = remainder
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11
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12 nam 16x16 bit Divide
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13 ttl Assembler Library Module
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14
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15
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16 psect DIV16,0,0,0,0,0
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17
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18 vsect
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19 negcount rmb 1
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20 endsect
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21
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22 * Signed Divide
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23 SDIV16:
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24 clr negcount,u
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25 PSHS D,X
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26 tst ,s
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27 bpl testquo
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28 ldd ,s
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29 comb
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30 coma
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31 addd #$0001
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32 std ,s
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33 inc negcount,u
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34 testquo
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35 tst 2,s
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36 bpl ok
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37 ldd 2,s
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38 comb
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39 coma
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40 addd #$0001
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41 std 2,s
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42 inc negcount,u
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43 ok
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44 puls d,x
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45 bsr DIV16
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46 dec negcount,u
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47 bne goforit
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48 pshs d,x
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49 ldd ,s
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50 coma
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51 comb
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52 addd #$0001
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53 std ,s
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54 ldd 2,s
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55 coma
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56 comb
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57 addd #$0001
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58 std 2,s
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59 puls d,x
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60 goforit
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61 rts
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62
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63
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64 * Unsigned Divide
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65 DIV16:
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66 PSHS D,X save divisor & dividend
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67 LDA #16 bit counter
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68 PSHS A
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69 CLRA initialize remainder
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70 CLRB
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71
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72 div1
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73 ASL 4,S shift dividend & quotient
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74 ROL 3,S
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75 ROLB shift dividend into B
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76 ROLA
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77 CMPD 1,S trial subtraction reqd?
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78 BLO div2
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79 SUBD 1,S yes, do subtraction
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80 INC 4,S increment quotient
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81
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82 div2
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83 DEC ,S count down another bit
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84 BNE div1
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85 LDX 3,S get quotient
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86 LEAS 5,S clean stack
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87 RTS
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88
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89 endsect
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90