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1 module dmd.expression.Div;
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2
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3 import dmd.common;
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4 import dmd.Type;
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5 import dmd.Expression;
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6 import dmd.Loc;
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7 import dmd.RealExp;
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8 import dmd.ComplexExp;
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9 import dmd.IntegerExp;
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10 import dmd.Complex;
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11
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12 Expression Div(Type type, Expression e1, Expression e2)
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13 {
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14 Expression e;
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15 Loc loc = e1.loc;
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16
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17 if (type.isfloating())
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18 {
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19 Complex!(real) c;
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20 real r;
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21
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22 //e1.type.print();
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23 //e2.type.print();
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24 if (e2.type.isreal())
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25 {
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26 if (e1.type.isreal())
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27 {
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28 e = new RealExp(loc, e1.toReal() / e2.toReal(), type);
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29 return e;
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30 }
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31
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32 //r = e2.toReal();
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33 //c = e1.toComplex();
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34 //printf("(%Lg + %Lgi) / %Lg\n", creall(c), cimagl(c), r);
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35 r = e2.toReal();
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36 c = e1.toComplex();
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37 c = Complex!(real)(c.re / r, c.im / r);
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38 }
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39 else if (e2.type.isimaginary())
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40 {
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41 //r = e2.toImaginary();
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42 //c = e1.toComplex();
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43 //printf("(%Lg + %Lgi) / %Lgi\n", creall(c), cimagl(c), r);
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44 r = e2.toImaginary();
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45 c = e1.toComplex();
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46 c = Complex!(real)(c.im / r, -c.re / r);
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47 }
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48 else
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49 {
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50 Complex!(real) c1 = e1.toComplex();
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51 Complex!(real) c2 = e2.toComplex();
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52
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53 real denumerator = c2.re*c2.re + c2.im*c2.im;
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54 real numerator_re = c1.re*c2.re + c1.im*c2.im;
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55 real numerator_im = c1.im*c2.re - c1.re*c2.im;
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56
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57 c = Complex!(real)(numerator_re / denumerator, numerator_im / denumerator);
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58 }
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59
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60 if (type.isreal())
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61 e = new RealExp(loc, c.re, type);
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62 else if (type.isimaginary())
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63 e = new RealExp(loc, c.im, type);
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64 else if (type.iscomplex())
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65 e = new ComplexExp(loc, c, type);
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66 else
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67 assert(0);
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68 }
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69 else
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70 {
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71 long n1;
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72 long n2;
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73 long n;
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74
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75 n1 = e1.toInteger();
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76 n2 = e2.toInteger();
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77
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78 if (n2 == 0)
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79 {
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80 e2.error("divide by 0");
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81 e2 = new IntegerExp(loc, 1, e2.type);
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82 n2 = 1;
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83 }
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84
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85 if (e1.type.isunsigned() || e2.type.isunsigned())
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86 n = (cast(ulong) n1) / (cast(ulong) n2);
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87 else
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88 n = n1 / n2;
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89
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90 e = new IntegerExp(loc, n, type);
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91 }
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92
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93 return e;
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94 } |
