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To: Andreas Schwab <schwab@suse.de>
Cc: Jan Hubicka <jh@suse.cz>, Richard Henderson <rth@redhat.com>,
   gcc-patches@gcc.gnu.org, aj@suse.de
Subject: Re: Converting floor to rint
References: <20021106175441.GZ22059@kam.mff.cuni.cz> <20021106180930.GA22066@redhat.com> <20021106211059.GB1316@atrey.karlin.mff.cuni.cz> <m365va2xfl.fsf@soliton.integrable-solutions.net> <20021106222922.GH1316@atrey.karlin.mff.cuni.cz> <m365va1f5b.fsf@soliton.integrable-solutions.net> <20021107092112.GF7964@kam.mff.cuni.cz> <m3smydvi3z.fsf@soliton.integrable-solutions.net> <20021107100359.GI7964@kam.mff.cuni.cz> <m3isz9v93j.fsf@soliton.integrable-solutions.net> <20021107125643.GA11315@atrey.karlin.mff.cuni.cz> <jeu1itmsit.fsf@sykes.suse.de>
From: Gabriel Dos Reis <gdr@integrable-solutions.net>
In-Reply-To: Andreas Schwab's message of "Thu, 07 Nov 2002 14:14:02 +0100"
Organization: Integrable Solutions
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Date: Thu, 07 Nov 2002 05:27:00 -0000
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Andreas Schwab <schwab@suse.de> writes:

| |> But why the standard don't say that rint function will raise the
| |> interrupt?  I would interpred may as it can behave that way or don't
| |> have to.
| 
| Yes, rint is the weaker function.

Thanks.  I didn't understand Jan's question in that way.  Thanks
for clarifying.

| The implementation of nearbyint must
| make sure that no inexact exception is raised, whereas for rint this is
| not necessary.  That means that if you have a round instruction that never
| raises the exception it can be used to implement both functions.

Yes.  Or said differently, rint() may be implemented in terms of
nearbyint() (+ raising exception where appropriate).

-- Gaby