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Re: expand and truncate and 387
- To: law at cygnus dot com, Jan Hubicka <hubicka at atrey dot karlin dot mff dot cuni dot cz>
- Subject: Re: expand and truncate and 387
- From: Richard Henderson <rth at cygnus dot com>
- Date: Thu, 26 Nov 1998 00:38:55 -0800
- Cc: moshier at mediaone dot net, egcs at cygnus dot com, Marc Lehmann <pcg at goof dot com>
- References: <19981123175442.47382@atrey.karlin.mff.cuni.cz> <25384.911840364@hurl.cygnus.com>
- Reply-To: Richard Henderson <rth at cygnus dot com>
On Mon, Nov 23, 1998 at 09:59:24AM -0700, Jeffrey A Law wrote:
> In message <19981123175442.47382@atrey.karlin.mff.cuni.cz>you write:
> > We can IMO ignore extensions, since there is no way to do them anyway (it
> > is not neccesary, since all values are already extended).
> That is *NOT* the impression I've gotten from the other messages on this
> thread.
As I understand it, all values in fp registers exist in the 80-bit
extended double format. One may twiddle fpcr bits to change where
rounding happens, but that does not affect the overall format.
I believe extensions to be a no-op.
r~