Wed, 8 Feb 2023 15:24:55 +0100

From: | Hans-Peter Diettrich <DrDiettrich1@netscape.net> |

Newsgroups: | comp.compilers |

Date: | Wed, 8 Feb 2023 15:24:55 +0100 |

Organization: | Compilers Central |

References: | 23-01-092 23-02-003 23-02-019 23-02-025 23-02-026 23-02-029 |

Injection-Info: | gal.iecc.com; posting-host="news.iecc.com:2001:470:1f07:1126:0:676f:7373:6970"; logging-data="12088"; mail-complaints-to="abuse@iecc.com" |

Keywords: | arithmetic |

Posted-Date: | 08 Feb 2023 11:50:16 EST |

In-Reply-To: | 23-02-029 |

On 2/7/23 2:31 PM, Hans-Peter Diettrich wrote:

*> On 2/6/23 10:26 PM, gah4 wrote:*

*>*

*>> Too bad for those CDC computers, and Unisys computers.*

*>> Last I know of sign-magnitude is the IBM 7090 and 7094.*

*>*

*> AFAIK use IEEE-754 floating point numbers still sign-magnitude*

*> representation.*

*> Then the same representation of integral numbers may have advantages in*

*> computations.*

*>*

*> DoDi*

*> [I presume the sign-magnitude is to enable the hidden bit trick,*

*> which doesn't apply in unscaled integers. -John]*

That's correct, the inprecise representation of FP numbers allows for

such tricks. The hidden bit trick can be used again with the FP

exponents, as I outlined in my Dynamic Floating Point Exponents proposal

<https://figshare.com/articles/preprint/Dynamic_Exponents_for_Floating_Point_Numbers-2022-04-07_pdf/19548187>.

DoDi

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