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Re: isnanl, printf, and non-IEEE values
From: |
Ben Pfaff |
Subject: |
Re: isnanl, printf, and non-IEEE values |
Date: |
Mon, 18 Jun 2012 13:14:19 -0700 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/23.2 (gnu/linux) |
Rich Felker <address@hidden> writes:
> On Mon, Jun 18, 2012 at 10:21:34AM -0700, Ben Pfaff wrote:
>> Bruno Haible <address@hidden> writes:
>>
>> > In theory you would be right that data should be validated at the
>> > boundaries
>> > of the program, that is, when they are read from outside sources. But no
>> > program I know of does this for unconstrained floating-point numbers.
>>
>> That's an interesting point. GNU PSPP reads unconstrained
>> "double"s from SPSS data files without validating them[*], since
>
> This is not a problem. As long as you're assuming IEEE, all 64-bit
> patterns are valid long double values. The issue only occurs for long
> double, a type that's very different in both arithmetic properties and
> representation between systems. On typical systems, it has padding
> bits (which might or might not be required to be all-zero) as well as
> bit combinations that are completely invalid.
OK, thanks for the information. Never mind, then.
- Re: isnanl, printf, and non-IEEE values, (continued)
- Re: isnanl, printf, and non-IEEE values, Paul Eggert, 2012/06/18
- Re: isnanl, printf, and non-IEEE values, John Spencer, 2012/06/19
- Re: isnanl, printf, and non-IEEE values, Eric Blake, 2012/06/19
- Re: isnanl, printf, and non-IEEE values, Jim Meyering, 2012/06/19
- Re: isnanl, printf, and non-IEEE values, Paul Eggert, 2012/06/19
- Re: isnanl, printf, and non-IEEE values, Bruno Haible, 2012/06/17
- Re: isnanl, printf, and non-IEEE values, Ben Pfaff, 2012/06/18
- Re: isnanl, printf, and non-IEEE values, Rich Felker, 2012/06/18
- Re: isnanl, printf, and non-IEEE values,
Ben Pfaff <=
- Re: musl printf bugs, Bruno Haible, 2012/06/17
- Re: musl printf bugs, Rich Felker, 2012/06/17
- Re: musl printf bugs, Bruno Haible, 2012/06/17
- Re: getopt.m4 test, Bruno Haible, 2012/06/19
- Re: getopt.m4 test, Bruno Haible, 2012/06/23
- Re: getopt.m4 test, Paul Eggert, 2012/06/23
- Re: getopt.m4 test, Bruno Haible, 2012/06/26
Re: stdioext on musl, Bruno Haible, 2012/06/17