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Re: Trick to knowing hex address alignment?

From Keith Thompson <Keith.S.Thompson+u@gmail.com>
Newsgroups comp.lang.c
Subject Re: Trick to knowing hex address alignment?
Date 2020-10-11 14:11 -0700
Organization None to speak of
Message-ID <87a6ws79jc.fsf@nosuchdomain.example.com> (permalink)
References <5%6gH.106678$tL.55004@fx15.iad> <rlsnk5$1ndm$1@gioia.aioe.org> <87lfgd7leh.fsf@nosuchdomain.example.com> <rlupeo$14a6$2@gioia.aioe.org>

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Christian Hanné <the.hanne@gmail.com> writes:
>> Convert to unintptr_t and check the low-order bits.
>
> The conversion is ultimately slow.

I wrote the text you quoted.  Please leave attributions in place.

I'm not sure just what you mean by "The conversion is ultimately
slow", but it's almost certainly incorrect.  Conversion between
same-sized integer and pointer types is likely to be free, or
nearly so.  Note that my suggestion was a reply to your claim that
calling sprintf() and checking the last character is "the most
efficient solution".

Are you serious?

-- 
Keith Thompson (The_Other_Keith) Keith.S.Thompson+u@gmail.com
Working, but not speaking, for Philips Healthcare
void Void(void) { Void(); } /* The recursive call of the void */

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Thread

Trick to knowing hex address alignment? dfs <nospam@dfs.com> - 2020-10-09 20:11 -0400
  Re: Trick to knowing hex address alignment? Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2020-10-09 18:43 -0600
    Re: Trick to knowing hex address alignment? dfs <nospam@dfs.com> - 2020-10-09 22:14 -0400
  Re: Trick to knowing hex address alignment? Kaz Kylheku <793-849-0957@kylheku.com> - 2020-10-10 01:10 +0000
    Re: Trick to knowing hex address alignment? dfs <nospam@dfs.com> - 2020-10-09 22:15 -0400
  Re: Trick to knowing hex address alignment? "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2020-10-10 01:30 -0400
    Re: Trick to knowing hex address alignment? BGB <cr88192@gmail.com> - 2020-10-10 01:30 -0500
      Re: Trick to knowing hex address alignment? "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2020-10-12 16:58 -0400
        Re: Trick to knowing hex address alignment? BGB <cr88192@gmail.com> - 2020-10-14 16:04 -0500
  Re: Trick to knowing hex address alignment? Christian Hanné <the.hanne@gmail.com> - 2020-10-10 18:31 +0200
    Re: Trick to knowing hex address alignment? Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2020-10-10 09:46 -0700
      Re: Trick to knowing hex address alignment? Christian Hanné <the.hanne@gmail.com> - 2020-10-10 19:50 +0200
        Re: Trick to knowing hex address alignment? Jorgen Grahn <grahn+nntp@snipabacken.se> - 2020-10-10 18:45 +0000
          Re: Trick to knowing hex address alignment? James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-10-10 15:05 -0400
        Re: Trick to knowing hex address alignment? "james...@alumni.caltech.edu" <jameskuyper@alumni.caltech.edu> - 2020-10-10 12:34 -0700
          Re: Trick to knowing hex address alignment? Christian Hanné <the.hanne@gmail.com> - 2020-10-11 08:10 +0200
            Re: Trick to knowing hex address alignment? Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2020-10-11 02:29 -0700
              Re: Trick to knowing hex address alignment? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2020-10-11 12:08 +0100
              Re: Trick to knowing hex address alignment? Christian Hanné <the.hanne@gmail.com> - 2020-10-11 13:13 +0200
                Re: Trick to knowing hex address alignment? Richard Damon <Richard@Damon-Family.org> - 2020-10-11 15:06 -0400
              Re: Trick to knowing hex address alignment? James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-10-11 15:27 -0400
                Re: Trick to knowing hex address alignment? Christian Hanné <the.hanne@gmail.com> - 2020-10-12 07:18 +0200
                Re: Trick to knowing hex address alignment? Christian Hanné <the.hanne@gmail.com> - 2020-10-12 08:19 +0200
                Re: Trick to knowing hex address alignment? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-10-12 00:43 -0700
                Re: Trick to knowing hex address alignment? David Brown <david.brown@hesbynett.no> - 2020-10-12 12:03 +0200
                Re: Trick to knowing hex address alignment? Christian Hanné <the.hanne@gmail.com> - 2020-10-12 13:14 +0200
                Re: Trick to knowing hex address alignment? Richard Damon <Richard@Damon-Family.org> - 2020-10-12 08:33 -0400
                Re: Trick to knowing hex address alignment? Christian Hanné <the.hanne@gmail.com> - 2020-10-12 16:21 +0200
                Re: Trick to knowing hex address alignment? "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2020-10-12 14:07 -0700
                Re: Trick to knowing hex address alignment? Christian Hanné <the.hanne@gmail.com> - 2020-10-13 06:58 +0200
                Re: Trick to knowing hex address alignment? "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2020-10-13 00:10 -0700
                Re: Trick to knowing hex address alignment? Christian Hanné <the.hanne@gmail.com> - 2020-10-13 09:53 +0200
                Re: Trick to knowing hex address alignment? "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2020-10-13 01:25 -0700
                Re: Trick to knowing hex address alignment? "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2020-10-13 01:31 -0700
                Re: Trick to knowing hex address alignment? Christian Hanné <the.hanne@gmail.com> - 2020-10-13 10:34 +0200
                Re: Trick to knowing hex address alignment? "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2020-10-13 01:47 -0700
                Re: Trick to knowing hex address alignment? Kaz Kylheku <793-849-0957@kylheku.com> - 2020-10-13 15:39 +0000
                Re: Trick to knowing hex address alignment? "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2020-10-13 16:16 -0700
                Re: Trick to knowing hex address alignment? scott@slp53.sl.home (Scott Lurndal) - 2020-10-12 14:32 +0000
                Re: Trick to knowing hex address alignment? "james...@alumni.caltech.edu" <jameskuyper@alumni.caltech.edu> - 2020-10-12 07:13 -0700
                Re: Trick to knowing hex address alignment? David Brown <david.brown@hesbynett.no> - 2020-10-12 19:16 +0200
                Re: Trick to knowing hex address alignment? Vir Campestris <vir.campestris@invalid.invalid> - 2020-10-12 21:26 +0100
                Re: Trick to knowing hex address alignment? "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2020-10-12 14:08 -0700
                Re: Trick to knowing hex address alignment? Christian Hanné <the.hanne@gmail.com> - 2020-10-13 06:50 +0200
        Re: Trick to knowing hex address alignment? Vir Campestris <vir.campestris@invalid.invalid> - 2020-10-11 21:16 +0100
          Re: Trick to knowing hex address alignment? Christian Hanné <the.hanne@gmail.com> - 2020-10-12 07:18 +0200
            Re: Trick to knowing hex address alignment? arnold@hooterville.invalid (Arnold Ziffel) - 2020-10-13 11:44 +0000
              Re: Trick to knowing hex address alignment? Christian Hanné <the.hanne@gmail.com> - 2020-10-13 14:21 +0200
                Re: Trick to knowing hex address alignment? arnold@hooterville.invalid (Arnold Ziffel) - 2020-10-13 13:18 +0000
                Re: Trick to knowing hex address alignment? Christian Hanné <the.hanne@gmail.com> - 2020-10-13 18:19 +0200
        Re: Trick to knowing hex address alignment? "james...@alumni.caltech.edu" <jameskuyper@alumni.caltech.edu> - 2020-10-11 14:12 -0700
          Re: Trick to knowing hex address alignment? Christian Hanné <the.hanne@gmail.com> - 2020-10-12 07:20 +0200
            Re: Trick to knowing hex address alignment? "james...@alumni.caltech.edu" <jameskuyper@alumni.caltech.edu> - 2020-10-12 07:09 -0700
            Re: Trick to knowing hex address alignment? scott@slp53.sl.home (Scott Lurndal) - 2020-10-12 14:35 +0000
              Re: Trick to knowing hex address alignment? Christian Hanné <the.hanne@gmail.com> - 2020-10-12 16:37 +0200
                Re: Trick to knowing hex address alignment? Bart <bc@freeuk.com> - 2020-10-12 15:51 +0100
                Re: Trick to knowing hex address alignment? Christian Hanné <the.hanne@gmail.com> - 2020-10-12 17:07 +0200
                Re: Trick to knowing hex address alignment? Bart <bc@freeuk.com> - 2020-10-12 16:45 +0100
                Re: Trick to knowing hex address alignment? Christian Hanné <the.hanne@gmail.com> - 2020-10-12 17:47 +0200
                Re: Trick to knowing hex address alignment? Bart <bc@freeuk.com> - 2020-10-12 17:05 +0100
                Re: Trick to knowing hex address alignment? Christian Hanné <the.hanne@gmail.com> - 2020-10-13 06:46 +0200
                Re: Trick to knowing hex address alignment? "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2020-10-12 14:19 -0700
                Re: Trick to knowing hex address alignment? arnold@hooterville.invalid (Arnold Ziffel) - 2020-10-13 11:48 +0000
                Re: Trick to knowing hex address alignment? Christian Hanné <the.hanne@gmail.com> - 2020-10-13 14:22 +0200
                Re: Trick to knowing hex address alignment? "james...@alumni.caltech.edu" <jameskuyper@alumni.caltech.edu> - 2020-10-13 06:25 -0700
                Re: Trick to knowing hex address alignment? Christian Hanné <the.hanne@gmail.com> - 2020-10-13 18:20 +0200
                Re: Trick to knowing hex address alignment?, speciall Richard Damon <Richard@Damon-Family.org> - 2020-10-13 12:38 -0400
                Re: Trick to knowing hex address alignment?, speciall James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-10-13 12:51 -0400
                Re: Trick to knowing hex address alignment? Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2020-10-12 11:11 -0600
                Re: Trick to knowing hex address alignment? scott@slp53.sl.home (Scott Lurndal) - 2020-10-12 18:50 +0000
                Re: Trick to knowing hex address alignment? Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2020-10-12 13:03 -0600
                Re: Trick to knowing hex address alignment? scott@slp53.sl.home (Scott Lurndal) - 2020-10-12 19:30 +0000
                Re: Trick to knowing hex address alignment? Christian Hanné <the.hanne@gmail.com> - 2020-10-13 06:47 +0200
                Re: Trick to knowing hex address alignment? arnold@hooterville.invalid (Arnold Ziffel) - 2020-10-13 11:52 +0000
                Re: Trick to knowing hex address alignment? Christian Hanné <the.hanne@gmail.com> - 2020-10-13 14:23 +0200
                Re: Trick to knowing hex address alignment? Bart <bc@freeuk.com> - 2020-10-13 14:43 +0100
                Re: Trick to knowing hex address alignment? Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2020-10-13 08:57 -0600
                Re: Trick to knowing hex address alignment? Christian Hanné <the.hanne@gmail.com> - 2020-10-13 18:21 +0200
                Re: Trick to knowing hex address alignment? Bart <bc@freeuk.com> - 2020-10-13 17:38 +0100
                Re: Trick to knowing hex address alignment? Christian Hanné <the.hanne@gmail.com> - 2020-10-13 19:03 +0200
                Re: Trick to knowing hex address alignment? Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2020-10-13 11:20 -0600
                Re: Trick to knowing hex address alignment? Christian Hanné <the.hanne@gmail.com> - 2020-10-13 19:23 +0200
                Re: Trick to knowing hex address alignment? Bart <bc@freeuk.com> - 2020-10-13 18:28 +0100
                Re: Trick to knowing hex address alignment? Christian Hanné <the.hanne@gmail.com> - 2020-10-13 19:30 +0200
                Re: Trick to knowing hex address alignment? arnold@hooterville.invalid (Arnold Ziffel) - 2020-10-14 09:24 +0000
                Re: Trick to knowing hex address alignment? James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-10-14 09:35 -0400
                Re: Trick to knowing hex address alignment? Christian Hanné <the.hanne@gmail.com> - 2020-10-15 09:29 +0200
                Re: Trick to knowing hex address alignment? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-10-13 10:24 -0700
                Re: Trick to knowing hex address alignment? Christian Hanné <the.hanne@gmail.com> - 2020-10-13 19:31 +0200
                Re: Trick to knowing hex address alignment? "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2020-10-13 14:47 -0700
                Re: Trick to knowing hex address alignment? Richard Damon <Richard@Damon-Family.org> - 2020-10-12 21:48 -0400
                Re: Trick to knowing hex address alignment? Christian Hanné <the.hanne@gmail.com> - 2020-10-13 06:49 +0200
                Re: Trick to knowing hex address alignment? scott@slp53.sl.home (Scott Lurndal) - 2020-10-13 15:24 +0000
                Re: Trick to knowing hex address alignment? Richard Damon <Richard@Damon-Family.org> - 2020-10-13 12:32 -0400
                Re: Trick to knowing hex address alignment? Vir Campestris <vir.campestris@invalid.invalid> - 2020-10-13 21:55 +0100
                Re: Trick to knowing hex address alignment? Vir Campestris <vir.campestris@invalid.invalid> - 2020-10-13 22:00 +0100
                Re: Trick to knowing hex address alignment? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-10-13 14:13 -0700
                Re: Trick to knowing hex address alignment? David Brown <david.brown@hesbynett.no> - 2020-10-14 13:13 +0200
                Re: Trick to knowing hex address alignment? scott@slp53.sl.home (Scott Lurndal) - 2020-10-14 15:59 +0000
                Re: Trick to knowing hex address alignment? Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2020-10-14 11:31 -0600
                Re: Trick to knowing hex address alignment? scott@slp53.sl.home (Scott Lurndal) - 2020-10-14 19:03 +0000
                Re: Trick to knowing hex address alignment? Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2020-10-13 09:50 -0600
                Re: Trick to knowing hex address alignment? Kaz Kylheku <793-849-0957@kylheku.com> - 2020-10-13 17:41 +0000
                Re: Trick to knowing hex address alignment? Christian Hanné <the.hanne@gmail.com> - 2020-10-13 20:07 +0200
                Re: Trick to knowing hex address alignment? Kaz Kylheku <793-849-0957@kylheku.com> - 2020-10-15 00:38 +0000
                Re: Trick to knowing hex address alignment? Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2020-10-14 21:23 -0600
          Re: Trick to knowing hex address alignment? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2020-10-12 11:20 +0100
            Re: Trick to knowing hex address alignment? James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-10-12 10:19 -0400
    Re: Trick to knowing hex address alignment? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-10-10 15:42 -0700
      Re: Trick to knowing hex address alignment? Christian Hanné <the.hanne@gmail.com> - 2020-10-11 13:14 +0200
        Re: Trick to knowing hex address alignment? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-10-11 14:11 -0700
          Re: Trick to knowing hex address alignment? Christian Hanné <the.hanne@gmail.com> - 2020-10-12 07:20 +0200
            Re: Trick to knowing hex address alignment? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-10-12 00:42 -0700
              Re: Trick to knowing hex address alignment? Christian Hanné <the.hanne@gmail.com> - 2020-10-12 13:16 +0200
                Re: Trick to knowing hex address alignment? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-10-12 07:22 -0700
                Re: Trick to knowing hex address alignment? Christian Hanné <the.hanne@gmail.com> - 2020-10-12 16:23 +0200
              Re: Trick to knowing hex address alignment? scott@slp53.sl.home (Scott Lurndal) - 2020-10-12 14:35 +0000
                Re: Trick to knowing hex address alignment? Christian Hanné <the.hanne@gmail.com> - 2020-10-12 16:40 +0200
                Re: Trick to knowing hex address alignment? "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2020-10-12 14:09 -0700
          Re: Trick to knowing hex address alignment? David Brown <david.brown@hesbynett.no> - 2020-10-12 08:26 +0200
            Re: Trick to knowing hex address alignment? Öö Tiib <ootiib@hot.ee> - 2020-10-12 03:19 -0700
              Re: Trick to knowing hex address alignment? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-10-12 07:22 -0700
              Re: Trick to knowing hex address alignment? arnold@hooterville.invalid (Arnold Ziffel) - 2020-10-13 11:59 +0000
                Re: Trick to knowing hex address alignment? Christian Hanné <the.hanne@gmail.com> - 2020-10-13 14:25 +0200
                Re: Trick to knowing hex address alignment? scott@slp53.sl.home (Scott Lurndal) - 2020-10-13 15:26 +0000
                Re: Trick to knowing hex address alignment? DFS <nospam@dfs.com> - 2020-10-13 11:33 -0400
                Re: Trick to knowing hex address alignment? Christian Hanné <the.hanne@gmail.com> - 2020-10-13 18:23 +0200
    Re: Trick to knowing hex address alignment? Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2020-10-11 09:47 -0600
  Re: Trick to knowing hex address alignment? Elias Schwerdtfeger <nachtwaechter@tamagothi.de> - 2020-10-10 18:45 +0200
    Re: Trick to knowing hex address alignment? Barry Schwarz <schwarzb@delq.com> - 2020-10-10 10:32 -0700
    Re: Trick to knowing hex address alignment? "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2020-10-10 14:01 -0700

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