Decimal and binary floating point rounding

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United States of America Patent

PATENT NO 9658828
SERIAL NO

14873450

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Abstract

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Arithmetic logic circuitry is provided for performing a floating point arithmetic add/subtract operation on first and second floating point numbers. The method includes: generating a guard digit for the first or second number by transforming the first and second numbers by a compressing function; determining a result depending on the arithmetic operation, a sum of the transformed floating point numbers, and first and second differences of the transformed floating point numbers, and determining a corresponding result plus one by additionally adding a value of one to the result; generating injection values for rounding the final result; generating injection carry values based on the transformed first and second numbers and the injection values; and selecting the final result from the result, the result plus one, and a least significant digit, based on the injection carry values and the end around carry signals.

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Patent Owner(s)

  • INTERNATIONAL BUSINESS MACHINES CORPORATION

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Carlough, Steven R Poughkeepsie, US 160 824
Kroener, Klaus M Boeblingen, DE 19 52
Leber, Petra Boeblingen, DE 41 105
Lichtenau, Cedric Boeblingen, DE 119 278
Mueller, Silvia M Boeblingen, DE 75 253

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