From: Massimiliano Cialdi <cialdi@firenze.net>
To: linux-c-programming <linux-c-programming@vger.kernel.org>
Cc: wwp <subscript@free.fr>
Subject: Re: bitfield array
Date: Mon, 12 Jan 2004 11:56:43 +0100 [thread overview]
Message-ID: <20040112115643.0000382e.cialdi@firenze.net> (raw)
In-Reply-To: <20040112112926.4e5794e3@tethys>
On Mon, 12 Jan 2004 11:29:26 +0100
wwp <subscript@free.fr> wrote:
> AFAIK, bitfields are stored in memory block which can only be
> allocated with 1-byte minimum.. Try to allocate 1 bit in memory,
> sounds not possible :-).
I know but I don't want to allocate a single bit. Since I need an array
of binary flag, I thought that the compiler could help me. 10 bits could
be placed in 2 bytes. Else I need 10 bytes (80% of space lost).
> IOW, if you use a 1-bit bitfield, it will still be require an amount
> of memory counted in bytes. That's partly why bitfields are not so
> used for optimization, 'cause following the compiler you don't gaim
> memory space not cpu time.
I work with a (very) limited memory embedded system. I need to save
memory, no matter in cpu time.
thanks
--
Massimiliano Cialdi
cialdi@firenze.net
m.cialdi@oksys.it
next prev parent reply other threads:[~2004-01-12 10:56 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-01-12 10:10 bitfield array Massimiliano Cialdi
2004-01-12 10:29 ` wwp
2004-01-12 10:56 ` Massimiliano Cialdi [this message]
2004-01-12 13:40 ` Mariano Moreyra
2004-01-13 1:02 ` James Stevenson
2004-01-12 21:06 ` Glynn Clements
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