发明申请
- 专利标题: Operation Method and Apparatus
- 专利标题(中): 操作方法与装置
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申请号: US11661375申请日: 2005-04-14
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公开(公告)号: US20080104160A1公开(公告)日: 2008-05-01
- 发明人: Kohei Kodama
- 申请人: Kohei Kodama
- 优先权: JP2004-248395 20040827
- 国际申请: PCT/JP05/07250 WO 20050414
- 主分类号: G06F7/485
- IPC分类号: G06F7/485
摘要:
Precision of arithmetic operations on floating-point numbers is improved while also preventing an increase in the amount of processing. A second converter converts an exponent included in an exponent field according to an exponent conversion rule defined in accordance with a function. A storage stores in a table a value obtained by converting a mantissa field according to a mantissa conversion rule defined in accordance with the function. A retrieving unit derives an index of the table, by extracting the most significant 8 bits from the 23 bits constituting the mantissa field. The retrieving unit adds 1 to the mantissa field approximated by the most significant 8 bits so as to derive a second index. A deriving unit derives a tentative return value A and a tentative return value B. Further, the deriving unit interpolates between the tentative return value A and the tentative return value B so as to derive a return value of the function.
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