发明授权
US08671129B2 System and method of bypassing unrounded results in a multiply-add pipeline unit
有权
在多重加法管道单元中绕过未包围结果的系统和方法
- 专利标题: System and method of bypassing unrounded results in a multiply-add pipeline unit
- 专利标题(中): 在多重加法管道单元中绕过未包围结果的系统和方法
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申请号: US13043101申请日: 2011-03-08
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公开(公告)号: US08671129B2公开(公告)日: 2014-03-11
- 发明人: Jeffrey S. Brooks , Christopher H. Olson
- 申请人: Jeffrey S. Brooks , Christopher H. Olson
- 申请人地址: US CA Redwood City
- 专利权人: Oracle International Corporation
- 当前专利权人: Oracle International Corporation
- 当前专利权人地址: US CA Redwood City
- 代理机构: Meyertons, Hood, Kivlin, Kowert & Goetzel, P.C.
- 代理商 Rory D. Rankin
- 主分类号: G06F7/32
- IPC分类号: G06F7/32
摘要:
A processing unit, system, and method for performing a multiply operation in a multiply-add pipeline. To reduce the pipeline latency, the unrounded result of a multiply-add operation is bypassed to the inputs of the multiply-add pipeline for use in a subsequent operation. If it is determined that rounding is required for the prior operation, then the rounding will occur during the subsequent operation. During the subsequent operation, a Booth encoder not utilized by the multiply operation will output a rounding correction factor as a selection input to a Booth multiplexer not utilized by the multiply operation. When the Booth multiplexer receives the rounding correction factor, the Booth multiplexer will output a rounding correction value to a carry save adder (CSA) tree, and the CSA tree will generate the correct sum from the rounding correction value and the other partial products.
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