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[bug-gnulib] Re: [bug-grep] Re: length of dec. representation of a numbe
From: |
Paul Jarc |
Subject: |
[bug-gnulib] Re: [bug-grep] Re: length of dec. representation of a number |
Date: |
Thu, 10 Mar 2005 14:34:31 -0500 |
User-agent: |
Gnus/5.110003 (No Gnus v0.3) Emacs/21.4 (gnu/linux) |
Stepan Kasal <address@hidden> wrote:
>> #define TYPE_MAXIMUM(t) \
>> ((t) (! TYPE_SIGNED (t) \
>> ? (t) -1 \
>> : ~ (~ (t) 0 << (sizeof (t) * CHAR_BIT - 1))))
>
> For unsigned types on signed magnitude hosts, ((t) -1) is wrong.
No, the standard explicitly says it's correct, for any representation.
Conversion of an out-of-range value to an unsigned type works by
reducing the value module <type>_MAX+1, so (type)-1==<type>_MAX.
paul
- [bug-gnulib] Re: [bug-grep] length of dec. representation of a number, (continued)
- [bug-gnulib] Re: [bug-grep] length of dec. representation of a number, Jim Meyering, 2005/03/08
- Re: [bug-gnulib] Re: [bug-grep] length of dec. representation of a number, Stepan Kasal, 2005/03/09
- Re: [bug-gnulib] Re: [bug-grep] length of dec. representation of a number, Paul Jarc, 2005/03/09
- [bug-gnulib] Re: length of dec. representation of a number, Paul Eggert, 2005/03/09
- [bug-gnulib] Re: length of dec. representation of a number, Paul Jarc, 2005/03/10
- [bug-gnulib] Re: [bug-grep] Re: length of dec. representation of a number, Jim Meyering, 2005/03/10
- Re: length of dec. representation of a number [bug-grep] [bug-gnulib], Stepan Kasal, 2005/03/10
- [bug-gnulib] Re: [bug-grep] Re: length of dec. representation of a number, Paul Jarc, 2005/03/10
- [bug-gnulib] Re: [bug-grep] Re: length of dec. representation of a number, Jim Meyering, 2005/03/10
- [bug-gnulib] Re: [bug-grep] Re: length of dec. representation of a number, Stepan Kasal, 2005/03/10
- [bug-gnulib] Re: [bug-grep] Re: length of dec. representation of a number,
Paul Jarc <=
- [bug-gnulib] Re: [bug-grep] Re: length of dec. representation of a number, Paul Eggert, 2005/03/10