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Groups > comp.lang.c > #155484 > unrolled thread

Trick to knowing hex address alignment?

Started bydfs <nospam@dfs.com>
First post2020-10-09 20:11 -0400
Last post2020-10-10 14:01 -0700
Articles 11 on this page of 131 — 23 participants

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  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

Page 7 of 7 — ← Prev page 1 2 3 4 5 6 [7]

#155560

FromÖö Tiib <ootiib@hot.ee>
Date2020-10-12 03:19 -0700
Message-ID<9a42eb24-0e4d-485d-bd10-4022272590beo@googlegroups.com>
In reply to#155556
On Monday, 12 October 2020 09:26:56 UTC+3, David Brown  wrote:
> On 11/10/2020 23:11, Keith Thompson wrote:
> > 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?
> > 
> 
> I think it is clear that Christian Hanné is serious about trolling
> people.  No one can possibly be as completely wrong and muddled as his
> posts have suggested (and we've seen a few wrong and muddled people in
> c.l.c. over the years).  He is trolling.  The only reason to reply to
> his posts would be if you think he might be confusing other people.

It seems to be same poster who deliberately wrote similar falsehoods
under "Scott Newman" until September or so. Perhaps people stopped to
respond and so it turned into "Christian Hanné" in September.

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#155569

FromKeith Thompson <Keith.S.Thompson+u@gmail.com>
Date2020-10-12 07:22 -0700
Message-ID<87k0vv5xth.fsf@nosuchdomain.example.com>
In reply to#155560
Öö Tiib <ootiib@hot.ee> writes:
[...]
> It seems to be same poster who deliberately wrote similar falsehoods
> under "Scott Newman" until September or so. Perhaps people stopped to
> respond and so it turned into "Christian Hanné" in September.

Perhaps, but I suggest not wasting time speculating on whether they're
the same person or not.  It doesn't matter.

-- 
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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#155613

Fromarnold@hooterville.invalid (Arnold Ziffel)
Date2020-10-13 11:59 +0000
Message-ID<c0503a7a-540d-4deb-bd44-fd9fbe68c405@hooterville.invalid>
In reply to#155560
Öö Tiib <ootiib@hot.ee> wrote:

> It seems to be same poster who deliberately wrote similar falsehoods
> under "Scott Newman" until September or so. Perhaps people stopped to
> respond and so it turned into "Christian Hanné" in September.

Scott Newman and Bonita Montero. Headers don't lie.

-- 
The person who snores the loudest will fall asleep first.

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#155617

FromChristian Hanné <the.hanne@gmail.com>
Date2020-10-13 14:25 +0200
Message-ID<rm46b3$t36$4@gioia.aioe.org>
In reply to#155613
>> It seems to be same poster who deliberately wrote similar falsehoods
>> under "Scott Newman" until September or so. Perhaps people stopped to
>> respond and so it turned into "Christian Hanné" in September.

> Scott Newman and Bonita Montero. Headers don't lie.

Sorry, my headers are different. I use an open Usenet-server whereas
this Boni-whatever uses a Usenet-server which needs registration.

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#155623

Fromscott@slp53.sl.home (Scott Lurndal)
Date2020-10-13 15:26 +0000
Message-ID<zGjhH.127958$MQ.66465@fx14.iad>
In reply to#155617
=?UTF-8?Q?Christian_Hann=c3=a9?= <the.hanne@gmail.com> writes:
>>> It seems to be same poster who deliberately wrote similar falsehoods
>>> under "Scott Newman" until September or so. Perhaps people stopped to
>>> respond and so it turned into "Christian Hanné" in September.
>
>> Scott Newman and Bonita Montero. Headers don't lie.
>
>Sorry, my headers are different. I use an open Usenet-server whereas
>this Boni-whatever uses a Usenet-server which needs registration.
>

You must thing everyone else is as stupid as you are.

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#155624

FromDFS <nospam@dfs.com>
Date2020-10-13 11:33 -0400
Message-ID<JQjhH.380555$0W4.104101@fx42.iad>
In reply to#155617
On 10/13/2020 8:25 AM, Christian Hanné wrote:
>>> It seems to be same poster who deliberately wrote similar falsehoods
>>> under "Scott Newman" until September or so. Perhaps people stopped to
>>> respond and so it turned into "Christian Hanné" in September.
> 
>> Scott Newman and Bonita Montero. Headers don't lie.
> 
> Sorry, my headers are different. I use an open Usenet-server whereas
> this Boni-whatever uses a Usenet-server which needs registration.


Say "I love the C language much more than C++".

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#155630

FromChristian Hanné <the.hanne@gmail.com>
Date2020-10-13 18:23 +0200
Message-ID<rm4k93$1tpe$4@gioia.aioe.org>
In reply to#155624
> Say "I love the C language much more than C++".

???

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#155517

FromJoe Pfeiffer <pfeiffer@cs.nmsu.edu>
Date2020-10-11 09:47 -0600
Message-ID<1b1ri4hii2.fsf@pfeifferfamily.net>
In reply to#155491
Christian Hanné <the.hanne@gmail.com> writes:

>> Is there a trick to quickly figuring the alignment?
>
> Do a sprintf and identify the 16-bit-aligned adresses by checking if
> the last digit is 0, the 32-bit-aligned addresses by checking if the
> last digit is 0 and the second last digit is even. That's the most
> efficient solution.

Given that the original question included the addresses he was asking
about, there's no need to discuss how to obtain the addresses.

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#155492

FromElias Schwerdtfeger <nachtwaechter@tamagothi.de>
Date2020-10-10 18:45 +0200
Message-ID<rlsoft$qrg$1@dont-email.me>
In reply to#155484
Am 10.10.20 um 02:11 schrieb dfs:

> Is there a trick to quickly figuring the alignment?

In C? Oh yes, of course:

#define _ALIGNED_HELPER(ADDR, N) ((ADDR) & ((1UL << (N)) - 1) == 0)
#define TWO_BIT_ALIGNED(ADDR) _ALIGNED_HELPER((ADDR), 1)
#define FOUR_BIT_ALIGNED(ADDR) _ALIGNED_HELPER((ADDR), 2)
#define EIGHT_BIT_ALIGNED(ADDR) _ALIGNED_HELPER((ADDR), 3)
#define SIXTEEN_BIT_ALIGNED(ADDR) _ALIGNED_HELPER((ADDR), 4)
/* etc... */

Beware of the side-effects in using macros.

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#155494

FromBarry Schwarz <schwarzb@delq.com>
Date2020-10-10 10:32 -0700
Message-ID<c0s3oftivjgfbu09v823mrj6rqedrle4et@4ax.com>
In reply to#155492
On Sat, 10 Oct 2020 18:45:49 +0200, Elias Schwerdtfeger
<nachtwaechter@tamagothi.de> wrote:

>Am 10.10.20 um 02:11 schrieb dfs:
>
>> Is there a trick to quickly figuring the alignment?
>
>In C? Oh yes, of course:
>
>#define _ALIGNED_HELPER(ADDR, N) ((ADDR) & ((1UL << (N)) - 1) == 0)

The operands of the & operator must be integers.  If ADDR is a
pointer, this is a constraint violation.

>#define TWO_BIT_ALIGNED(ADDR) _ALIGNED_HELPER((ADDR), 1)
>#define FOUR_BIT_ALIGNED(ADDR) _ALIGNED_HELPER((ADDR), 2)
>#define EIGHT_BIT_ALIGNED(ADDR) _ALIGNED_HELPER((ADDR), 3)
>#define SIXTEEN_BIT_ALIGNED(ADDR) _ALIGNED_HELPER((ADDR), 4)
>/* etc... */
>
>Beware of the side-effects in using macros.

-- 
Remove del for email

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#155500

From"Chris M. Thomasson" <chris.m.thomasson.1@gmail.com>
Date2020-10-10 14:01 -0700
Message-ID<rlt7et$fp4$2@gioia.aioe.org>
In reply to#155492
On 10/10/2020 9:45 AM, Elias Schwerdtfeger wrote:
> Am 10.10.20 um 02:11 schrieb dfs:
> 
>> Is there a trick to quickly figuring the alignment?
> 
> In C? Oh yes, of course:
> 
> #define _ALIGNED_HELPER(ADDR, N) ((ADDR) & ((1UL << (N)) - 1) == 0)
> #define TWO_BIT_ALIGNED(ADDR) _ALIGNED_HELPER((ADDR), 1)
> #define FOUR_BIT_ALIGNED(ADDR) _ALIGNED_HELPER((ADDR), 2)
> #define EIGHT_BIT_ALIGNED(ADDR) _ALIGNED_HELPER((ADDR), 3)
> #define SIXTEEN_BIT_ALIGNED(ADDR) _ALIGNED_HELPER((ADDR), 4)
> /* etc... */
> 
> Beware of the side-effects in using macros.
> 

This might be of interest here:

https://pastebin.com/raw/f37a23918

____________________
#define RALLOC_ALIGN_UP(mp_ptr, mp_align) \
   ((void*)( \
     (((ralloc_uintptr_type)(mp_ptr)) + ((mp_align) - 1)) \
     & ~(((mp_align) - 1)) \
   ))


#define RALLOC_ALIGN_ASSERT(mp_ptr, mp_align) \
   (((void*)(mp_ptr)) == RALLOC_ALIGN_UP(mp_ptr, mp_align))
____________________


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