Package com.io7m.ieee754b16

Class Binary64

java.lang.Object

com.io7m.ieee754b16.Binary64

public final class Binary64
extends Object

Utility functions related to the binary64 format specified in IEEE 754 2008.

Method Summary

Modifier and Type	Method	Description
static long	unpackGetExponentUnbiased(double d)	Extract and unbias the exponent of the given packed double value.
static long	unpackGetSign(double d)	Retrieve the sign bit of the given floating point value, as an integer.
static long	unpackGetSignificand(double d)	Return the significand of the given floating point value as an integer.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Details

unpackGetExponentUnbiased

public static long unpackGetExponentUnbiased(double d)

Extract and unbias the exponent of the given packed double value.

The exponent is encoded biased as a number in the range [0, 2047], with 0 indicating that the number is subnormal and [1, 2046] denoting the actual exponent plus BIAS. Infinite and NaN values always have a biased exponent of 2047.

This function will therefore return:

• 0 - BIAS = -1023 iff the input is a subnormal number.
• An integer in the range [1 - BIAS, 2046 - BIAS] = [-1022, 1023] iff the input is a normal number.
• 2047 - BIAS = 1024 iff the input is Double.POSITIVE_INFINITY, Double.NEGATIVE_INFINITY, or NaN.

Parameters:

d - A floating point value

Returns:

An unbiased exponent

unpackGetSign

public static long unpackGetSign(double d)

Retrieve the sign bit of the given floating point value, as an integer.

Parameters:

d - A floating point value

Returns:

An unpacked sign bit

unpackGetSignificand

public static long unpackGetSignificand(double d)

Return the significand of the given floating point value as an integer.

Parameters:

d - A floating point value

Returns:

An unpacked significand

See Also:

• Binary16.packSetSignificandUnchecked(int)