From: Paul Eggert <eggert@cs.ucla.edu>
To: Alejandro Colomar <colomar.6.4.3@gmail.com>
Cc: Florian Weimer <fweimer@redhat.com>,
Alejandro Colomar via Libc-alpha <libc-alpha@sourceware.org>,
linux-man@vger.kernel.org, gcc-patches@gcc.gnu.org,
mtk.manpages@gmail.com
Subject: Re: [PATCH 1/4] system_data_types.7: Add '__int128'
Date: Fri, 2 Oct 2020 13:19:24 -0700 [thread overview]
Message-ID: <936422e4-d292-d435-6c3c-333b924b8ad0@cs.ucla.edu> (raw)
In-Reply-To: <be53c11a-1729-e895-e5a5-b9b6a42f29de@gmail.com>
On 10/2/20 1:03 PM, Alejandro Colomar wrote:
> I know it's not in stdint,
> but I mean that it behaves as any other stdint type.
It doesn't. There's no portable way to use scanf and printf on it. You can't
reliably convert it to intmax_t. It doesn't have the associated _MIN and _MAX
macros that the stdint types do. It's a completely different animal.
If all you need are a few bit-twiddling tricks on x86-64, it should work. But
watch out if you try to do something fancy, like multiply or divide or read or
print or atomics. There's a good reason it's excluded from intmax_t.
next prev parent reply other threads:[~2020-10-02 20:19 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-01 16:34 [PATCH 0/4] Document 128-bit types Alejandro Colomar
2020-10-01 16:34 ` [PATCH 1/4] system_data_types.7: Add '__int128' Alejandro Colomar
2020-10-02 11:47 ` Florian Weimer
2020-10-02 17:52 ` Paul Eggert
2020-10-02 19:01 ` Alejandro Colomar
2020-10-02 19:54 ` Paul Eggert
2020-10-02 20:03 ` Alejandro Colomar
2020-10-02 20:19 ` Paul Eggert [this message]
2020-10-02 23:44 ` Alejandro Colomar
2020-10-02 23:53 ` Paul Eggert
2020-10-05 7:12 ` Florian Weimer
2020-10-07 6:53 ` Michael Kerrisk (man-pages)
2020-10-07 6:57 ` Florian Weimer
2020-10-01 16:34 ` [PATCH 2/4] __int128.3: New link to system_data_types(7) Alejandro Colomar
2020-10-01 16:34 ` [PATCH 3/4] system_data_types.7: Add 'unsigned __int128' Alejandro Colomar
2020-10-01 16:34 ` [PATCH 4/4] unsigned-__int128.3: New link to system_data_types(7) Alejandro Colomar
2020-10-02 12:28 ` [PATCH v2 0/4] Document 128-bit types Alejandro Colomar
2020-10-02 12:28 ` [PATCH v2 1/4] system_data_types.7: Add '__int128' Alejandro Colomar
2020-10-02 12:28 ` [PATCH v2 2/4] __int128.3: New link to system_data_types(7) Alejandro Colomar
2020-10-02 12:28 ` [PATCH v2 3/4] system_data_types.7: Add 'unsigned __int128' Alejandro Colomar
2020-10-02 12:28 ` [PATCH v2 4/4] unsigned-__int128.3: New link to system_data_types(7) Alejandro Colomar
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=936422e4-d292-d435-6c3c-333b924b8ad0@cs.ucla.edu \
--to=eggert@cs.ucla.edu \
--cc=colomar.6.4.3@gmail.com \
--cc=fweimer@redhat.com \
--cc=gcc-patches@gcc.gnu.org \
--cc=libc-alpha@sourceware.org \
--cc=linux-man@vger.kernel.org \
--cc=mtk.manpages@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).