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From: graichen@julia.physik.fu-berlin.de (Thomas Graichen)
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Re: gcc: strong request for 8 byte alignment for double.
Date: 11 Nov 1995 09:37:53 GMT
Organization: Freie Universitaet Berlin
Lines: 31
Message-ID: <481qth$1a9@fu-berlin.de>
References: <47vo08$t62@nyx.eos.hokudai.ac.jp>
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Hiroshi Murakami (hiroshi@teine.chem2.hokudai.ac.jp) wrote:
: We found, that gcc-2.6.3 comes with FreeBSD2.1 pre-release
: does not honor the 8 byte alignment for double variables.
: On Pentium, which has 64bits bus, if the double alignment
: were not made, every load/store, fp arithmetics slows down
: in factor of about two. The users programs without any sign
: could be slow by this reason unless the address of variables
: or arrays are examined.
: Please let the compiler/linker/loader to honor this alignment,
: otherwise the performance is just wasted.
it's part of 2.7.0 - if you really need it:
* get gcc-2.7.0
* unpack it
* configure
* make
then you have it :-)
t
_______________________________________________________||_____________________
__||
Perfection is reached, not when there is no __|| thomas graichen
longer anything to add, but when there __|| freie universitaet berlin
is no longer anything to take away __|| fachbereich physik
__||
- Antoine de Saint-Exupery - __||
___________________________||____email: graichen@omega.physik.fu-berlin.de____