From: Glynn Clements <glynn@gclements.plus.com>
To: Steve Graegert <graegerts@gmail.com>
Cc: linux-c-programming@vger.kernel.org
Subject: Re: Disadvantage of using long long int
Date: Wed, 22 Feb 2006 18:55:24 +0000 [thread overview]
Message-ID: <17404.45980.455312.5228@cerise.gclements.plus.com> (raw)
In-Reply-To: <6a00c8d50602220954h324b36a4i2ed432ad5616c65d@mail.gmail.com>
Steve Graegert wrote:
> > In terms of performance and raw speed, is there any disadvantage of using
> > "long long int" instead of "long int", "long double" instead of "double" on
> > 32-bit machine ? Are there any other disadvantage that I should consider?
>
> On 32-bit Intel machines a long long int (64 bits) is usually not the
> same as a long int (32 bits), the same is true for double (64 bits,
> IEEE754) and long double (96 bits, IEEE845).
In C99 (ISO-IEC 9899:1999), long double is supposed to be one of the
two ISO-IEC 60559 extended formats, which are 80 or 128 bits. On x86,
it's usually 80 bits.
> BTW long long int is a GNU extension and subject to portability.
long long int is part of the C99 standard.
--
Glynn Clements <glynn@gclements.plus.com>
next prev parent reply other threads:[~2006-02-22 18:55 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-02-22 17:35 Disadvantage of using long long int Reuben D. Budiardja
2006-02-22 17:46 ` Glynn Clements
2006-02-22 17:54 ` Steve Graegert
2006-02-22 18:55 ` Glynn Clements [this message]
2006-02-22 19:09 ` Steve Graegert
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