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Message-ID:	<3510DDA6.4C010E27@pfh.research.philips.com>
Date:	Thu, 19 Mar 1998 09:56:06 +0100
From:	Thomas Koehler <T DOT Koehler AT pfh DOT research DOT philips DOT com>
Organization:	Philips
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To:	Marc Lehmann <pcg AT goof DOT com>
CC:	beastium-list AT desk DOT nl
Subject:	Re: paranoia & extra precision [was -fno-float-store in pgcc]
References:	<Pine DOT SOL DOT 3 DOT 96 DOT 980313133308 DOT 249A-100000 AT stekt10> <35094C21 DOT 6B3F0566 AT pfh DOT research DOT philips DOT com> <19980314021923 DOT 32075 AT cerebro DOT laendle>
Sender:	Marc Lehmann <pcg AT goof DOT com>
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Marc Lehmann wrote:
> 
> On Fri, Mar 13, 1998 at 04:09:21PM +0100, Thomas Koehler wrote:
> 
> > so what is the difference between the behaviour of programs compiled
> > with -ffloat-store compared to setting the FPU-rounding mode to double
> > via __setfpucw? (except that the -ffloat-store variante is much slower).
> 
> you can still program ansi c.

I think you mean that I can program platform independent (which ansi c
rule is violated if I use __setfpucw in my programs?)

> 
> with setfpucw, you have to store the cw on almost every fpu operation.
> gcc already does this for integer concersions (for other reasons).

Interesting. If I set the fpucw on startup in main using __setfpucw
(e.g. because I want to get SIGFPE's), is it ensured that the rest of
the program is executed with this fpucw?

-- 



Thomas Koehler
Philips Research Laboratories
Division Technical Systems
Roentgenstrasse 24-26
D-22335 Hamburg
Germany

phone:  +40/5078-2103
e-mail: T DOT Koehler AT PFH DOT Research DOT Philips DOT com

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