Invention Grant
US08812575B2 Decimal floating-point square-root unit using Newton-Raphson iterations
有权
使用牛顿 - 拉夫逊迭代的十进制浮点平方根单位
- Patent Title: Decimal floating-point square-root unit using Newton-Raphson iterations
- Patent Title (中): 使用牛顿 - 拉夫逊迭代的十进制浮点平方根单位
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Application No.: US13177488Application Date: 2011-07-06
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Publication No.: US08812575B2Publication Date: 2014-08-19
- Inventor: Ramy Raafat , Amira Mohamed , Hossam Ali Hassan Fahmy , Yasmeen Farouk , Mostafa Elkhouly , Tarek Eldeeb , Rodina Samy
- Applicant: Ramy Raafat , Amira Mohamed , Hossam Ali Hassan Fahmy , Yasmeen Farouk , Mostafa Elkhouly , Tarek Eldeeb , Rodina Samy
- Applicant Address: EG Cairo
- Assignee: SilMinds, LLC, Egypt
- Current Assignee: SilMinds, LLC, Egypt
- Current Assignee Address: EG Cairo
- Agency: Osha Liang LLP
- Main IPC: G06F7/552
- IPC: G06F7/552

Abstract:
A system including: an input processing unit configured to: extract a significant and a bias exponent from the decimal floating-point radicand; and calculate a normalized significand; a square root unit configured to: calculate, using a FMA unit, a refined reciprocal square-root of the normalized significand; calculate an unrounded square-root of the normalized significand by multiplying the refined reciprocal square-root by the normalized significand; and generate a rounded square-root based on a first difference between the normalized significand and a square of the unrounded square-root; a master control unit operatively connected to the input processing hardware unit and the square-root hardware unit and configured to calculate an exponent for the unrounded square-root based on the number of leading zeros and a precision of the decimal floating-point radicand; and an output formulation unit configured to output a decimal floating-point square-root of the radicand based on the rounded square-root and the exponent.
Public/Granted literature
- US20120011182A1 DECIMAL FLOATING-POINT SQUARE-ROOT UNIT USING NEWTON-RAPHSON ITERATIONS Public/Granted day:2012-01-12
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