by Tobias Muelle » Sat, 23 May 1998 04:00:00
I need to control the direction of rounding for floating point
operations under Linux according to the ieee 754 standard. I couldn'd
find any function in the Linux libraries to do that. Does anyone have an
idea?
Please reply also by mail.
Cheers
-- Tobias
-------------------------------------------------
Tobias Mller, http://www.ps.uni-sb.de/~tmueller/
by Ben Pfaf » Sat, 23 May 1998 04:00:00
I need to control the direction of rounding for floating point
operations under Linux according to the ieee 754 standard. I couldn'd
find any function in the Linux libraries to do that. Does anyone have an
idea?
__setfpucw
by Ulrich Dreppe » Sat, 23 May 1998 04:00:00
-- Uli
---------------. drepper at gnu.org ,-. 1325 Chesapeake Terrace
Ulrich Drepper \ ,-------------------' \ Sunnyvale, CA 94089 USA
Cygnus Solutions `--' drepper at cygnus.com `------------------------
by Bill Metzenth » Mon, 25 May 1998 04:00:00
>> __setfpucw
>Better don't propagate this function too much. glibc 2.1 will provide
>the functionality from ISO C 9x to control must IEEE features of the
>FPU. This seems to work already for all the platforms we are
>supporting.
--
---------------------------------------------------------------------------
Bill Metzenthen | See http://www.suburbia.net/~billm/ for information
Melbourne, Australia | the floating point environment on 80x86 Linux.
---------------------------------------------------------------------------
1. Network standard for floating point numbers? [summary]
[ I'm sorry I couldn't thread this to my original posting, but it
expired on our news server. ]
I would like to thank everyone who replied. The nearly unanimous
gave the best summary:
The xdr library seems to be available on every machine that supports
nfs and rpc -- just about everybody these days. xdr uses the IEEE-754
standard for floating point, so the conversion from double is a no-op
for most machines.
Given the near universal usage of IEEE-754 representation, a fact I
was previously unaware of, I have decided to use it directly in my
protocol. To keep things simple, I have decided not to use the xdr
library until such time as a conversion to IEEE-754 is actually
required.
Peter Johansson
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