Jackson-core 2.16.0 · com.fasterxml.jackson.core.io.schubfach.MathUtils

Modifier and Type	Field and Description
private static final long	A_10
private static final long	C_10
private static final long	C_2
private static final long[]	g
pack-priv static final int	H
pack-priv static final int	K_MAX
pack-priv static final int	K_MIN
private static final long[]	pow10
private static final int	Q_10
private static final int	Q_2

Access	Constructor and Description
private	MathUtils()

Method Summary

Modifier and Type	Method and Description
pack-priv static int	Returns: ⌊log₁₀2^e⌋. flog10pow2(int The exponent of 2, which should meet \|`e`\| ≤ 5_456_721 for safe results. e) Returns the unique integer k such that 10^k ≤ 2^e < 10^k+1.
pack-priv static int	Returns: ⌊log₁₀(3/4 · 2^e)⌋. flog10threeQuartersPow2(int The exponent of 2, which should meet -2_956_395 ≤ `e` ≤ 2_500_325 for safe results. e) Returns the unique integer k such that 10^k ≤ 3/4 · 2^e < 10^k+1.
pack-priv static int	Returns: ⌊log₂10^e⌋. flog2pow10(int The exponent of 10, which should meet \|`e`\| ≤ 1_838_394 for safe results. e) Returns the unique integer k such that 2^k ≤ 10^e < 2^k+1.
pack-priv static long	Returns: g₀ as described in `g1(int)`. g0(int The exponent of 10, which must meet `K_MIN` ≤ `e` ≤ `K_MAX`. k) Returns g₀ as described in `g1(int)`.
pack-priv static long	Returns: g₁ as described above. g1(int The exponent of 10, which must meet `K_MIN` ≤ `e` ≤ `K_MAX`. k) Let 10^-k = β 2^r, for the unique pair of integer r and real β meeting 2¹²⁵ ≤ β < 2¹²⁶.
pack-priv static long	multiplyHigh(long x, long y)
pack-priv static long	Returns: 10^e. pow10(int The exponent which must meet 0 ≤ `e` ≤ `H`. e) Returns 10^e.

Inherited from java.lang.Object:: clone equals finalize getClass hashCode notify notifyAll toString wait wait wait

A_10	back to summary
private static final long A_10

C_10	back to summary
private static final long C_10

C_2	back to summary
private static final long C_2

g	back to summary
private static final long[] g

H	back to summary
pack-priv static final int H

K_MAX	back to summary
pack-priv static final int K_MAX

K_MIN	back to summary
pack-priv static final int K_MIN

pow10	back to summary
private static final long[] pow10

Q_10	back to summary
private static final int Q_10

Q_2	back to summary
private static final int Q_2

MathUtils	back to summary
private MathUtils()

Method Detail

flog10pow2 back to summary

flog10pow2	back to summary
pack-priv static int flog10pow2(int e) Returns the unique integer k such that 10^k ≤ 2^e < 10^k+1. The result is correct when \|`e`\| ≤ 5_456_721. Otherwise the result is undefined. Parameters e:int The exponent of 2, which should meet \|`e`\| ≤ 5_456_721 for safe results. Returns:int ⌊log₁₀2^e⌋.

pack-priv static int flog10pow2(int e)

Returns the unique integer k such that 10^k ≤ 2^e < 10^k+1.

The result is correct when |e| ≤ 5_456_721. Otherwise the result is undefined.

Parameters

e:int: The exponent of 2, which should meet |e| ≤ 5_456_721 for safe results.

Returns:int

⌊log₁₀2^e⌋.

flog10threeQuartersPow2 back to summary

flog10threeQuartersPow2	back to summary
pack-priv static int flog10threeQuartersPow2(int e) Returns the unique integer k such that 10^k ≤ 3/4 · 2^e < 10^k+1. The result is correct when -2_956_395 ≤ `e` ≤ 2_500_325. Otherwise the result is undefined. Parameters e:int The exponent of 2, which should meet -2_956_395 ≤ `e` ≤ 2_500_325 for safe results. Returns:int ⌊log₁₀(3/4 · 2^e)⌋.

pack-priv static int flog10threeQuartersPow2(int e)

Returns the unique integer k such that 10^k ≤ 3/4 · 2^e < 10^k+1.

The result is correct when -2_956_395 ≤ e ≤ 2_500_325. Otherwise the result is undefined.

Parameters

e:int: The exponent of 2, which should meet -2_956_395 ≤ e ≤ 2_500_325 for safe results.

Returns:int

⌊log₁₀(3/4 · 2^e)⌋.

flog2pow10 back to summary

flog2pow10	back to summary
pack-priv static int flog2pow10(int e) Returns the unique integer k such that 2^k ≤ 10^e < 2^k+1. The result is correct when \|`e`\| ≤ 1_838_394. Otherwise the result is undefined. Parameters e:int The exponent of 10, which should meet \|`e`\| ≤ 1_838_394 for safe results. Returns:int ⌊log₂10^e⌋.

pack-priv static int flog2pow10(int e)

Returns the unique integer k such that 2^k ≤ 10^e < 2^k+1.

The result is correct when |e| ≤ 1_838_394. Otherwise the result is undefined.

Parameters

e:int: The exponent of 10, which should meet |e| ≤ 1_838_394 for safe results.

Returns:int

⌊log₂10^e⌋.

g0 back to summary

g0	back to summary
pack-priv static long g0(int k) Returns g₀ as described in `g1(int)`. Parameters k:int The exponent of 10, which must meet `K_MIN` ≤ `e` ≤ `K_MAX`. Returns:long g₀ as described in `g1(int)`.

pack-priv static long g0(int k)

Returns g₀ as described in g1(int).

Parameters

k:int: The exponent of 10, which must meet K_MIN ≤ e ≤ K_MAX.

Returns:long

g₀ as described in g1(int).

g1 back to summary

g1	back to summary
pack-priv static long g1(int k) Let 10^-k = β 2^r, for the unique pair of integer r and real β meeting 2¹²⁵ ≤ β < 2¹²⁶. Further, let g = ⌊β⌋ + 1. Split g into the higher 63 bits g₁ and the lower 63 bits g₀. Thus, g₁ = ⌊g 2^-63⌋ and g₀ = g - g₁ 2⁶³. This method returns g₁ while `g0(int)` returns g₀. If needed, the exponent r can be computed as r = `flog2pow10(-k)` - 125 (see `flog2pow10(int)`). Parameters k:int The exponent of 10, which must meet `K_MIN` ≤ `e` ≤ `K_MAX`. Returns:long g₁ as described above.

pack-priv static long g1(int k)

Let 10^-k = β 2^r, for the unique pair of integer r and real β meeting 2¹²⁵ ≤ β < 2¹²⁶. Further, let g = ⌊β⌋ + 1. Split g into the higher 63 bits g₁ and the lower 63 bits g₀. Thus, g₁ = ⌊g 2^-63⌋ and g₀ = g - g₁ 2⁶³.

This method returns g₁ while g0(int) returns g₀.

If needed, the exponent r can be computed as r = flog2pow10(-k) - 125 (see flog2pow10(int)).

Parameters

k:int: The exponent of 10, which must meet K_MIN ≤ e ≤ K_MAX.

Returns:long

g₁ as described above.

multiplyHigh	back to summary
pack-priv static long multiplyHigh(long x, long y)

pow10 back to summary

pow10	back to summary
pack-priv static long pow10(int e) Returns 10^e. Parameters e:int The exponent which must meet 0 ≤ `e` ≤ `H`. Returns:long 10^e.

pack-priv static long pow10(int e)

Returns 10^e.

Parameters

e:int: The exponent which must meet 0 ≤ e ≤ H.

Returns:long

10^e.

pack-priv final Class MathUtils

Field Summary

Constructor Summary

Method Summary

Field Detail

Constructor Detail

Method Detail