From mboxrd@z Thu Jan  1 00:00:00 1970
From: Richard Henderson <rth@cygnus.com>
To: moshier@mediaone.net, Richard Henderson <rth@cygnus.com>
Cc: Jan Hubicka <hubicka@atrey.karlin.mff.cuni.cz>, law@cygnus.com, egcs@cygnus.com, Marc Lehmann <pcg@goof.com>
Subject: Re: expand and truncate and 387
Date: Mon, 30 Nov 1998 23:25:00 -0000
Message-id: <19981130192827.A26735@dot.cygnus.com>
References: <19981130171931.A22081@dot.cygnus.com> <Pine.LNX.4.05.9811302127001.6760-100000@moshier.ne.mediaone.net>
X-SW-Source: 1998-12/msg00007.html

On Mon, Nov 30, 1998 at 09:30:41PM -0500, Stephen L Moshier wrote:
> 
>     Therefore no additional signaling is
>     required when the value is already in a register.
> 
> Therefore?  Suppose the value was loaded for some other operation,
> then the user clears the IEEE flags, then calls for a conversion operation
> on the value that is still in the register.  Mustn't there be
> another exception, on the conversion?

I sure _hope_ the user ain't fooling aroung with exception flags
behind my back with asms. 

If they do things properly, they'll be making a function call
to feclearexcept (iso c9x <fenv.h>).  And since all fp regs
are call-clobbered, there will be no values live in registers.


r~