Re: old floating point, C arithmetic, was Software proofs, was Are there different

From	gah4 <gah4@u.washington.edu>
Newsgroups	comp.compilers
Subject	Re: old floating point, C arithmetic, was Software proofs, was Are there different
Date	2023-02-11 22:48 -0800
Organization	Compilers Central
Message-ID	<23-02-042@comp.compilers> (permalink)
References	(5 earlier) <23-02-029@comp.compilers> <23-02-033@comp.compilers> <23-02-037@comp.compilers> <23-02-038@comp.compilers> <23-02-040@comp.compilers>

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(our moderator wrote)

> [Oh, right, I forgot about Zuse. He invented a lot of stuff that other
> people reinvented later. Squinting at my VAX architecture handbook, the
> formats have the same layout as IEEE but the exponents are excess 128 and
> 1024 rather than 127 and 1023 and there's no infinities or denormals. -John]

I always forget the difference between them.

VAX has the binary point to the left of the hidden one, and IEEE to the right.
So that makes up for the one difference in exponent bias.

But no infinity and NaN means that the actual exponent can be one higher.

I think that is the way it works.

I never had problems reading S/360 format from hex dumps, where
the exponent is in whole hexdecimal digits, and no hidden one.

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Re: Are there different programming languages that are compiled to the same intermediate language? Martin Ward <mwardgkc@gmail.com> - 2023-01-31 14:04 +0000
  Re: Are there different programming languages that are compiled to the same intermediate language? arnold@freefriends.org (Aharon Robbins) - 2023-02-01 08:07 +0000
    Re: Software proofs, was Are there different programming languages that are compiled to the same intermediate language? Spiros Bousbouras <spibou@gmail.com> - 2023-02-05 15:14 +0000
      Re: C arithmetic, was Software proofs, was Are there different Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2023-02-05 16:14 -0800
        Re: C arithmetic, was Software proofs, was Are there different gah4 <gah4@u.washington.edu> - 2023-02-06 13:26 -0800
          Re: C arithmetic, was Software proofs, was Are there different Hans-Peter Diettrich <DrDiettrich1@netscape.net> - 2023-02-07 14:31 +0100
            Re: C arithmetic, was Software proofs, was Are there different gah4 <gah4@u.washington.edu> - 2023-02-08 01:10 -0800
              Re: C arithmetic, was Software proofs, was Are there different gah4 <gah4@u.washington.edu> - 2023-02-09 00:26 -0800
                Re: C arithmetic, was Software proofs, was Are there different gah4 <gah4@u.washington.edu> - 2023-02-11 00:01 -0800
                Re: C arithmetic, was Software proofs, was Are there different drb@ihatespam.msu.edu (Dennis Boone) - 2023-02-12 04:37 +0000
            Re: C arithmetic, was Software proofs, was Are there different anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2023-02-08 10:19 +0000
              Re: C arithmetic, was Software proofs, was Are there different Hans-Peter Diettrich <DrDiettrich1@netscape.net> - 2023-02-10 19:11 +0100
                Re: C arithmetic, was Software proofs, was Are there different gah4 <gah4@u.washington.edu> - 2023-02-10 23:47 -0800
                Re: C arithmetic, was Software proofs, was Are there different anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2023-02-11 22:34 +0000
                Re: old floating point, C arithmetic, was Software proofs, was Are there different gah4 <gah4@u.washington.edu> - 2023-02-11 22:48 -0800
            Re: C arithmetic, was Software proofs, was Are there different Hans-Peter Diettrich <DrDiettrich1@netscape.net> - 2023-02-08 15:24 +0100
              Re: C arithmetic, was Software proofs, was Are there different gah4 <gah4@u.washington.edu> - 2023-02-09 00:37 -0800

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