Invention Grant
US07444366B2 Faster shift value calculation using modified carry-lookahead adder
失效
使用改进的进位前瞻加法器更快地移位值计算
- Patent Title: Faster shift value calculation using modified carry-lookahead adder
- Patent Title (中): 使用改进的进位前瞻加法器更快地移位值计算
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Application No.: US10853518Application Date: 2004-05-26
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Publication No.: US07444366B2Publication Date: 2008-10-28
- Inventor: Paul R. Thayer , Sanjay Kumar
- Applicant: Paul R. Thayer , Sanjay Kumar
- Applicant Address: US TX Houston US CA Santa Clara
- Assignee: Hewlett-Packard Development Company, L.P.,Intel Corporation
- Current Assignee: Hewlett-Packard Development Company, L.P.,Intel Corporation
- Current Assignee Address: US TX Houston US CA Santa Clara
- Main IPC: G06F7/38
- IPC: G06F7/38 ; G06F7/50

Abstract:
Circuitry for reducing propagation delays in calculation of a value for use in a floating point multiply-accumulate operation. In the circuitry, a carry-save adder receives values of three input operands from three latches. A carry-lookahead adder receives the outputs from the carry-save adder and implements an XOR operation on a most-significant bit along with its own logic operation to produce the value for the floating point multiply-accumulate operation. Modification of the carry-lookahead adder to perform the XOR operation results in elimination of an entire stage of logic.
Public/Granted literature
- US20040220991A1 Faster shift value calculation using modified carry-lookahead adder Public/Granted day:2004-11-04
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