Octuple-precision floating-point format: Difference between revisions

Revision as of 21:09, 8 June 2015

Revision as of 21:50, 8 June 2015

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== IEEE 754 octuple-precision binary floating-point format: binary256 ==

In its 2008 revision, the [[IEEE 754]] standard specifies a '''binary 256binary256''' format among the ''interchange formats'' (it is not a basic format), as having:

* [[Sign bit]]: 1 bit

* [[Exponent]] width: 19 bits

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The bits are laid out as follows:

[[File:Octuple persision visual demontration.png|1200px1000px|OctupleLayout persisionof visualoctuple demontrationprecision floating point format]]

=== Exponent encoding ===

The octuple-precision binary floating-point exponent is encoded using an [[offset binary]] representation, with the zero offset being 262143; also known as exponent bias in the IEEE  754 standard.

* E_min = −262142