发明申请
US20080104160A1 Operation Method and Apparatus 有权
操作方法与装置

  • 专利标题: Operation Method and Apparatus
  • 专利标题(中): 操作方法与装置
  • 申请号: US11661375
    申请日: 2005-04-14
  • 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
Operation Method and Apparatus
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.
信息查询
0/0