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ST20C2 数据表(PDF) 149 Page - STMicroelectronics |
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ST20C2 数据表(HTML) 149 Page - STMicroelectronics |
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149 / 212 page  roundsn 149/212 ® roundsn round single length floating point number Code: 26 FD Description: Round an unpacked result of a floating point oper ation into Areg. Rounding is performed in round-to-nearest mode, as defined b y IEEE-754. Initially the post-normalised guardword, fractionword and exponent are in Areg, Breg, and Creg, as left by the instruction postnormsn. This instruction is only intended to be used in the single length rounding code sequence immediately after postnormsn. Definition: Areg ′← rounded and packed fp number Breg ′← undefined Creg ′← undefined Error signals: none Comments: Secondary instruction. See also: postnormsn unpacksn |
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