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单词 carry-lookahead
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carry-lookahead
2. Computing. More fully carry-lookahead. A method in computational arithmetic whereby the individual elements of an adder (adder n.2 3) are capable of determining when addition performed by preceding stages will generate output which has to be carried to subsequent stages; an implementation of this method. Frequently attributive.
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1959 Proc. Eastern Joint Computer Conf. 52/1 This carry look-ahead results in a delay time of 150 mμsec for 96-bit binary number additions.
1963 I. Flores Logic Computer Arithm. v. 83 Let us examine an adder which performs the carry function with a lookahead on several levels.
1971 IEEE Trans. Computers 20 863/1 The method of obtaining carries simultaneously using the well known technique for binary adders of carry look-ahead is easily extended.
1989 IEEE Jrnl. Solid-state Circuits 24 358/1 The use of the carry lookahead..principle..for high-speed arithmetic units remains dominant.
2002 G. R. Wilson Embedded Syst. & Computer Archit. iv. 60 Even though there are now several layers of look-ahead logic, this adder has a substantial advantage in speed of operation.
extracted from lookaheadn.adj.
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