Method for reducing the number of bits needed for the representation of constant values in a data processing device

Method for reducing the number of bits needed for the representation of constant values in a data processing device

A method for reducing the number of bits needed to represent constant values in a data processing device. A group of constant values is defined by selecting them as a function of their statistical frequency of use. Each constant value of this group in the instructions is represented by means of a sh...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: SANTINOLI, DAVIDE, COSTA, RAFFAELE
Format: Patent
Sprache:eng
Schlagworte:
BASIC ELECTRONIC CIRCUITRY
CALCULATING
CODE CONVERSION IN GENERAL
CODING
COMPUTING
COUNTING
DECODING
ELECTRIC DIGITAL DATA PROCESSING
ELECTRICITY
PHYSICS
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Beschreibung
Zusammenfassung:A method for reducing the number of bits needed to represent constant values in a data processing device. A group of constant values is defined by selecting them as a function of their statistical frequency of use. Each constant value of this group in the instructions is represented by means of a shorter coded operand field and a current instruction is loaded from a bus in an instruction register. A corresponding operand field is derived from the coded operand field of the current instruction by expansion means, and a bus and an output of the expansion means are selectively connected as input to an arithmetic logic unit.