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Initial commit
author korDen
date Sat, 24 Oct 2009 08:42:06 +0400
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children e28b18c23469
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-1:000000000000 0:10317f0c89a5
1 module dmd.expression.Min;
2
3 import dmd.Expression;
4 import dmd.Type;
5 import dmd.Loc;
6 import dmd.RealExp;
7 import dmd.ComplexExp;
8 import dmd.IntegerExp;
9 import dmd.TOK;
10 import dmd.SymOffExp;
11 import dmd.Complex;
12
13 Expression Min(Type type, Expression e1, Expression e2)
14 {
15 Expression e;
16 Loc loc = e1.loc;
17
18 if (type.isreal())
19 {
20 e = new RealExp(loc, e1.toReal() - e2.toReal(), type);
21 }
22 else if (type.isimaginary())
23 {
24 e = new RealExp(loc, e1.toImaginary() - e2.toImaginary(), type);
25 }
26 else if (type.iscomplex())
27 {
28 // This rigamarole is necessary so that -0.0 doesn't get
29 // converted to +0.0 by doing an extraneous add with +0.0
30 Complex!(real) c1;
31 real r1;
32 real i1;
33
34 Complex!(real) c2;
35 real r2;
36 real i2;
37
38 Complex!(real) v;
39 int x;
40
41 if (e1.type.isreal())
42 {
43 r1 = e1.toReal();
44 x = 0;
45 }
46 else if (e1.type.isimaginary())
47 {
48 i1 = e1.toImaginary();
49 x = 3;
50 }
51 else
52 {
53 c1 = e1.toComplex();
54 x = 6;
55 }
56
57 if (e2.type.isreal())
58 {
59 r2 = e2.toReal();
60 }
61 else if (e2.type.isimaginary())
62 {
63 i2 = e2.toImaginary();
64 x += 1;
65 }
66 else
67 {
68 c2 = e2.toComplex();
69 x += 2;
70 }
71
72 switch (x)
73 {
74 case 0+0: v = Complex!(real)(r1 - r2, 0); break;
75 case 0+1: v = Complex!(real)(r1, -i2); break;
76 case 0+2: v = Complex!(real)(r1 - c2.re, -c2.im); break;
77 case 3+0: v = Complex!(real)(-r2, i1); break;
78 case 3+1: v = Complex!(real)(0, i1 - i2); break;
79 case 3+2: v = Complex!(real)(c2.re, i1 - c2.im); break;
80 case 6+0: v = Complex!(real)(c1.re - r2, c1.im); break;
81 case 6+1: v = Complex!(real)(c1.re, c1.im - i2); break;
82 case 6+2: v = Complex!(real)(c1.re - c2.re, c1.im - c2.im); break;
83 }
84 e = new ComplexExp(loc, v, type);
85 }
86 else if (e1.op == TOK.TOKsymoff)
87 {
88 SymOffExp soe = cast(SymOffExp)e1;
89 e = new SymOffExp(loc, soe.var, soe.offset - cast(uint)e2.toInteger());
90 e.type = type;
91 }
92 else
93 {
94 e = new IntegerExp(loc, e1.toInteger() - e2.toInteger(), type);
95 }
96 return e;
97 }