From: Bart Schaefer <schaefer@brasslantern.com>
To: zsh-users@zsh.org
Subject: Re: Determining the length of "long"?
Date: Fri, 12 Sep 2014 17:17:37 -0700 [thread overview]
Message-ID: <140912171737.ZM23818@torch.brasslantern.com> (raw)
In-Reply-To: <20140912234254.GA30434@gmx.de>
On Sep 13, 12:42am, Dominik Vogt wrote:
} Subject: Re: Determining the length of "long"?
}
} To clarify, on s390 (1 << 31) has the same result as (1 << 63) *if*
} the integer type is long (which I doubt, zsh probably uses long
} long).
Indeed, I wasn't aware (more accurately, forgot) that s390 has those
oddball 31-bit integers.
} The underlying assumption of the test that shifting an integer
} value to the left by its width in bits or more yields zero is
} wrong on some platforms.
That's not the underlying assumption, acctually. The assumption is
that shifting by (number of bits minus one) will yield a very long
binary number (the ${#:-"..."} in the test: lots of trailing zeroes),
whereas shifting by the number of bits or more yields a number with a
smaller footprint because multiple leading zeroes are not printed.
next prev parent reply other threads:[~2014-09-13 0:17 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-11 21:36 Dominik Vogt
2014-09-12 2:58 ` Kurtis Rader
2014-09-12 4:39 ` Bart Schaefer
2014-09-12 8:42 ` Dominik Vogt
2014-09-12 13:17 ` Kurtis Rader
2014-09-12 23:16 ` Bart Schaefer
2014-09-12 23:42 ` Dominik Vogt
2014-09-13 0:17 ` Bart Schaefer [this message]
2014-09-12 8:51 ` Peter Stephenson
2014-09-12 16:17 ` Roman Neuhauser
2014-09-12 17:04 ` Dominik Vogt
2014-09-12 18:10 ` Roman Neuhauser
2014-09-12 18:50 ` Dominik Vogt
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