From: Andreas Schwab <schwab@suse.de>
To: Hilfinger@CS.Berkeley.EDU
Cc: gdb-patches@sources.redhat.com
Subject: Re: [RFA] Setting long long bitfields
Date: Mon, 01 Nov 2004 02:48:00 -0000 [thread overview]
Message-ID: <je8y9mb83i.fsf@sykes.suse.de> (raw)
In-Reply-To: <200410312304.i9VN3xLF022057@tully.CS.Berkeley.EDU> (Paul Hilfinger's message of "Sun, 31 Oct 2004 15:03:59 -0800")
Paul Hilfinger <hilfingr@EECS.Berkeley.EDU> writes:
> > > One possible tweak, several of us have an aversion to "?:", it would be
> > > nice if it wasn't there :-)
> >
> > Like this perhaps:
> >
> > + ULONGEST mask = (ULONGEST) -1 >> (8 * sizeof (ULONGEST) - bitsize);
>
> Andreas,
>
> I had considered exactly that line, but unfortunately ran across the
> following really irritating provision in the C standard:
>
> "If the value of the right operand is negative or is
> *greater than or equal to* the width of the promoted left
> operand, the behavior is undefined."
That cannot happen, because bitsize will never be zero.
Andreas.
--
Andreas Schwab, SuSE Labs, schwab@suse.de
SuSE Linux AG, Maxfeldstraße 5, 90409 Nürnberg, Germany
Key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5
"And now for something completely different."
next prev parent reply other threads:[~2004-11-01 2:48 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-10-31 9:08 Paul Hilfinger
2004-10-31 18:13 ` Andrew Cagney
2004-10-31 18:43 ` Andreas Schwab
2004-10-31 23:04 ` Paul Hilfinger
2004-11-01 2:48 ` Andreas Schwab [this message]
2004-11-01 11:17 ` Paul Hilfinger
2004-11-01 9:42 Paul N. Hilfinger
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=je8y9mb83i.fsf@sykes.suse.de \
--to=schwab@suse.de \
--cc=Hilfinger@CS.Berkeley.EDU \
--cc=gdb-patches@sources.redhat.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