Re: FFT Speeds

Newsgroups	comp.arch.embedded
Date	2020-04-02 20:43 -0700
References	(7 earlier) <NvkhG.90905$yg4.62187@fx27.iad> <c815c99c-8feb-4770-8140-e5ad536150f2@googlegroups.com> <r65b5c$dvs$1@dont-email.me> <6f9ee452-1178-469e-ba92-b355e061dd59@googlegroups.com> <87eet5jlaa.fsf@nightsong.com>
Message-ID	<01c60db3-e7ea-428a-a370-67834e0802b3@googlegroups.com> (permalink)
Subject	Re: FFT Speeds
From	Rick C <gnuarm.deletethisbit@gmail.com>

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On Thursday, April 2, 2020 at 11:33:24 PM UTC-4, Paul Rubin wrote:
> Rick C <gnuarm.deletethisbit@gmail.com> writes:
> > Your mention of two's complement as if there were other choices
> 
> IEEE 754 floating point, relevant to this discussion, is sign-magnitude.

That's not the main data format on any machines I know of.  No one uses floating point for logic or flags.  It was an issue in Forth because of the way people perform logic using non-flags or math using flags.  A one's complement or a signed magnitude data format breaks any assumptions you make about mixing the two.  

Some people complain that the practice happens making programs potentially non-portable so it looks like they are going to standardize on two's complement so these programs will be compliant and the griping will stop.  No one is complaining the change will break anything. 

-- 

  Rick C.

  --- Get 1,000 miles of free Supercharging
  --- Tesla referral code - https://ts.la/richard11209

Thread

FFT Speeds Rick C <gnuarm.deletethisbit@gmail.com> - 2020-03-30 12:11 -0700
  Re: FFT Speeds David Brown <david.brown@hesbynett.no> - 2020-03-30 21:50 +0200
    Re: FFT Speeds Stef <stef33d@yahooI-N-V-A-L-I-D.com.invalid> - 2020-03-31 09:33 +0200
  Re: FFT Speeds dalai lamah <antonio12358@hotmail.com> - 2020-03-31 16:14 +0200
    Re: FFT Speeds Clifford Heath <no.spam@please.net> - 2020-04-01 12:07 +1100
      Re: FFT Speeds Paul Rubin <no.email@nospam.invalid> - 2020-03-31 18:41 -0700
        Re: FFT Speeds Clifford Heath <no.spam@please.net> - 2020-04-01 13:40 +1100
          Re: FFT Speeds Rick C <gnuarm.deletethisbit@gmail.com> - 2020-03-31 20:53 -0700
            Re: FFT Speeds Clifford Heath <no.spam@please.net> - 2020-04-01 18:45 +1100
            Re: FFT Speeds Clive Arthur <cliveta@nowaytoday.co.uk> - 2020-04-01 17:32 +0100
              Re: FFT Speeds Rick C <gnuarm.deletethisbit@gmail.com> - 2020-04-01 12:20 -0700
                Re: FFT Speeds Clive Arthur <cliveta@nowaytoday.co.uk> - 2020-04-02 09:40 +0100
                Re: FFT Speeds Rick C <gnuarm.deletethisbit@gmail.com> - 2020-04-02 02:00 -0700
                Re: FFT Speeds upsidedown@downunder.com - 2020-04-02 12:50 +0300
              Re: FFT Speeds Richard Damon <Richard@Damon-Family.org> - 2020-04-02 08:02 -0400
                Re: FFT Speeds Rick C <gnuarm.deletethisbit@gmail.com> - 2020-04-02 11:16 -0700
                Re: FFT Speeds Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2020-04-02 21:33 +0300
                Re: FFT Speeds Rick C <gnuarm.deletethisbit@gmail.com> - 2020-04-02 12:39 -0700
                Re: FFT Speeds Paul Rubin <no.email@nospam.invalid> - 2020-04-02 20:33 -0700
                Re: FFT Speeds Rick C <gnuarm.deletethisbit@gmail.com> - 2020-04-02 20:43 -0700
                Re: FFT Speeds upsidedown@downunder.com - 2020-04-03 09:34 +0300
                Re: FFT Speeds Rick C <gnuarm.deletethisbit@gmail.com> - 2020-04-03 01:29 -0700
                Re: FFT Speeds David Brown <david.brown@hesbynett.no> - 2020-04-03 12:23 +0200
                Re: FFT Speeds Clifford Heath <no.spam@please.net> - 2020-04-03 21:48 +1100
                Re: FFT Speeds Rick C <gnuarm.deletethisbit@gmail.com> - 2020-04-03 10:38 -0700
                Re: FFT Speeds Clive Arthur <cliveta@nowaytoday.co.uk> - 2020-04-04 11:50 +0100
                Re: FFT Speeds David Brown <david.brown@hesbynett.no> - 2020-04-03 09:12 +0200
                Re: FFT Speeds Rick C <gnuarm.deletethisbit@gmail.com> - 2020-04-03 01:30 -0700
                Re: FFT Speeds David Brown <david.brown@hesbynett.no> - 2020-04-03 12:39 +0200
          Re: FFT Speeds Paul Rubin <no.email@nospam.invalid> - 2020-04-01 10:43 -0700
            Re: FFT Speeds Clifford Heath <no.spam@please.net> - 2020-04-02 13:26 +1100
      Re: FFT Speeds Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2020-04-01 17:27 -0400

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