公开(公告)号：US20030169077A1

公开(公告)日：2003-09-11

申请号：US10360831

申请日：2003-02-07

Applicant: STMicroelectronics S.A.

Inventor： Benoit Dupont De Dinechin

IPC: H03K019/20

CPC classification number: G06F7/509 ,  G06F7/49921 ,  G06F7/5443

Abstract: A method for determining, by means of a circuit, a result sknull2 of an operation of the type 1 s k + 2 = ( s k null + null null a k ) null + null null a k + 1 where sk, ak, and aknull1 are fractional signed operands and symbol 2 + null represents a saturating addition operation, comprising: a step of calculation of three sums representative of a possible value of the result, and a step of selection of one of said three sums according to overflows having occurred in the sum calculation. At least one step of the method uses the positive part and the negative part of at least one of the operands.