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BigInteger shifting mapped to constants for an improved performance.

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mlemanczyk committed 2026-01-22 19:01:03 +01:00
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commit dfd3f71f5d
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PerfectNumbers.Core/Pow2Provider.cs
+146
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using System.Numerics;
namespace PerfectNumbers.Core
{
public static class Pow2Provider
{
public static BigInteger BigInteger(int i) => i switch
{
0 => System.Numerics.BigInteger.One,
1 => BigIntegerNumbers.Two,
2 => BigIntegerNumbers.Pow2Exact2,
3 => BigIntegerNumbers.Pow2Exact3,
4 => BigIntegerNumbers.Pow2Exact4,
5 => BigIntegerNumbers.Pow2Exact5,
6 => BigIntegerNumbers.Pow2Exact6,
7 => BigIntegerNumbers.Pow2Exact7,
8 => BigIntegerNumbers.Pow2Exact8,
9 => BigIntegerNumbers.Pow2Exact9,
10 => BigIntegerNumbers.Pow2Exact10,
11 => BigIntegerNumbers.Pow2Exact11,
12 => BigIntegerNumbers.Pow2Exact12,
13 => BigIntegerNumbers.Pow2Exact13,
14 => BigIntegerNumbers.Pow2Exact14,
15 => BigIntegerNumbers.Pow2Exact15,
16 => BigIntegerNumbers.Pow2Exact16,
17 => BigIntegerNumbers.Pow2Exact17,
18 => BigIntegerNumbers.Pow2Exact18,
19 => BigIntegerNumbers.Pow2Exact19,
20 => BigIntegerNumbers.Pow2Exact20,
21 => BigIntegerNumbers.Pow2Exact21,
22 => BigIntegerNumbers.Pow2Exact22,
23 => BigIntegerNumbers.Pow2Exact23,
24 => BigIntegerNumbers.Pow2Exact24,
25 => BigIntegerNumbers.Pow2Exact25,
26 => BigIntegerNumbers.Pow2Exact26,
27 => BigIntegerNumbers.Pow2Exact27,
28 => BigIntegerNumbers.Pow2Exact28,
29 => BigIntegerNumbers.Pow2Exact29,
30 => BigIntegerNumbers.Pow2Exact30,
31 => BigIntegerNumbers.Pow2Exact31,
32 => BigIntegerNumbers.Pow2Exact32,
33 => BigIntegerNumbers.Pow2Exact33,
34 => BigIntegerNumbers.Pow2Exact34,
35 => BigIntegerNumbers.Pow2Exact35,
36 => BigIntegerNumbers.Pow2Exact36,
37 => BigIntegerNumbers.Pow2Exact37,
38 => BigIntegerNumbers.Pow2Exact38,
39 => BigIntegerNumbers.Pow2Exact39,
40 => BigIntegerNumbers.Pow2Exact40,
41 => BigIntegerNumbers.Pow2Exact41,
42 => BigIntegerNumbers.Pow2Exact42,
43 => BigIntegerNumbers.Pow2Exact43,
44 => BigIntegerNumbers.Pow2Exact44,
45 => BigIntegerNumbers.Pow2Exact45,
46 => BigIntegerNumbers.Pow2Exact46,
47 => BigIntegerNumbers.Pow2Exact47,
48 => BigIntegerNumbers.Pow2Exact48,
49 => BigIntegerNumbers.Pow2Exact49,
50 => BigIntegerNumbers.Pow2Exact50,
51 => BigIntegerNumbers.Pow2Exact51,
52 => BigIntegerNumbers.Pow2Exact52,
53 => BigIntegerNumbers.Pow2Exact53,
54 => BigIntegerNumbers.Pow2Exact54,
55 => BigIntegerNumbers.Pow2Exact55,
56 => BigIntegerNumbers.Pow2Exact56,
57 => BigIntegerNumbers.Pow2Exact57,
58 => BigIntegerNumbers.Pow2Exact58,
59 => BigIntegerNumbers.Pow2Exact59,
60 => BigIntegerNumbers.Pow2Exact60,
61 => BigIntegerNumbers.Pow2Exact61,
62 => BigIntegerNumbers.Pow2Exact62,
63 => BigIntegerNumbers.Pow2Exact63,
_ => throw new ArgumentOutOfRangeException(nameof(i), $"Parameter value {i} is incorrect"),
};
public static BigInteger BigIntegerMinusOne(int i) => i switch
{
0 => System.Numerics.BigInteger.Zero,
1 => BigIntegerNumbers.Pow2MinusOne1,
2 => BigIntegerNumbers.Pow2MinusOne2,
3 => BigIntegerNumbers.Pow2MinusOne3,
4 => BigIntegerNumbers.Pow2MinusOne4,
5 => BigIntegerNumbers.Pow2MinusOne5,
6 => BigIntegerNumbers.Pow2MinusOne6,
7 => BigIntegerNumbers.Pow2MinusOne7,
8 => BigIntegerNumbers.Pow2MinusOne8,
9 => BigIntegerNumbers.Pow2MinusOne9,
10 => BigIntegerNumbers.Pow2MinusOne10,
11 => BigIntegerNumbers.Pow2MinusOne11,
12 => BigIntegerNumbers.Pow2MinusOne12,
13 => BigIntegerNumbers.Pow2MinusOne13,
14 => BigIntegerNumbers.Pow2MinusOne14,
15 => BigIntegerNumbers.Pow2MinusOne15,
16 => BigIntegerNumbers.Pow2MinusOne16,
17 => BigIntegerNumbers.Pow2MinusOne17,
18 => BigIntegerNumbers.Pow2MinusOne18,
19 => BigIntegerNumbers.Pow2MinusOne19,
20 => BigIntegerNumbers.Pow2MinusOne20,
21 => BigIntegerNumbers.Pow2MinusOne21,
22 => BigIntegerNumbers.Pow2MinusOne22,
23 => BigIntegerNumbers.Pow2MinusOne23,
24 => BigIntegerNumbers.Pow2MinusOne24,
25 => BigIntegerNumbers.Pow2MinusOne25,
26 => BigIntegerNumbers.Pow2MinusOne26,
27 => BigIntegerNumbers.Pow2MinusOne27,
28 => BigIntegerNumbers.Pow2MinusOne28,
29 => BigIntegerNumbers.Pow2MinusOne29,
30 => BigIntegerNumbers.Pow2MinusOne30,
31 => BigIntegerNumbers.Pow2MinusOne31,
32 => BigIntegerNumbers.Pow2MinusOne32,
33 => BigIntegerNumbers.Pow2MinusOne33,
34 => BigIntegerNumbers.Pow2MinusOne34,
35 => BigIntegerNumbers.Pow2MinusOne35,
36 => BigIntegerNumbers.Pow2MinusOne36,
37 => BigIntegerNumbers.Pow2MinusOne37,
38 => BigIntegerNumbers.Pow2MinusOne38,
39 => BigIntegerNumbers.Pow2MinusOne39,
40 => BigIntegerNumbers.Pow2MinusOne40,
41 => BigIntegerNumbers.Pow2MinusOne41,
42 => BigIntegerNumbers.Pow2MinusOne42,
43 => BigIntegerNumbers.Pow2MinusOne43,
44 => BigIntegerNumbers.Pow2MinusOne44,
45 => BigIntegerNumbers.Pow2MinusOne45,
46 => BigIntegerNumbers.Pow2MinusOne46,
47 => BigIntegerNumbers.Pow2MinusOne47,
48 => BigIntegerNumbers.Pow2MinusOne48,
49 => BigIntegerNumbers.Pow2MinusOne49,
50 => BigIntegerNumbers.Pow2MinusOne50,
51 => BigIntegerNumbers.Pow2MinusOne51,
52 => BigIntegerNumbers.Pow2MinusOne52,
53 => BigIntegerNumbers.Pow2MinusOne53,
54 => BigIntegerNumbers.Pow2MinusOne54,
55 => BigIntegerNumbers.Pow2MinusOne55,
56 => BigIntegerNumbers.Pow2MinusOne56,
57 => BigIntegerNumbers.Pow2MinusOne57,
58 => BigIntegerNumbers.Pow2MinusOne58,
59 => BigIntegerNumbers.Pow2MinusOne59,
60 => BigIntegerNumbers.Pow2MinusOne60,
61 => BigIntegerNumbers.Pow2MinusOne61,
62 => BigIntegerNumbers.Pow2MinusOne62,
63 => BigIntegerNumbers.Pow2MinusOne63,
1024 => BigIntegerNumbers.Pow2MinusOne1024,
_ => throw new ArgumentOutOfRangeException(nameof(i), $"Parameter value {i} is incorrect"),
};
}
}