From: Stephen L Moshier <moshier@mediaone.net>
To: Joe Buck <jbuck@Synopsys.COM>
Cc: tprince@cat.e-mail.com, bosch@gnat.com, burley@gnu.org,
egcs@cygnus.com, hjstein@bfr.co.il
Subject: Re: /internet
Date: Wed, 16 Dec 1998 05:44:00 -0000 [thread overview]
Message-ID: <Pine.LNX.4.05.9812160811380.31180-100000@moshier.ne.mediaone.net> (raw)
In-Reply-To: <199812160320.TAA11586@atrus.synopsys.com>
> If I understand correctly, Jeff's proposal was to respect ordering when
> the user provides parentheses, but to leave the compiler free to do
> reordering when the user does not provide parentheses.
That would lead immediately to getting different answers on different
machines, or even different answers after slight code changes on the
same machine. The order of evaluation would be changed to suit each
particular machine's scheduling algorithm. It should not be permitted
as the normal behavior.
Since reordering can produce infinitely large numerical changes,
I have argued against allowing associative law optimization even
in fast-math mode. It ought to be well isolated with its own
command switch, -fvectorize or some such.
next prev parent reply other threads:[~1998-12-16 5:44 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
1998-12-15 15:06 /internet tprince
1998-12-15 19:12 ` /internet Stephen L Moshier
1998-12-15 19:21 ` /internet Joe Buck
1998-12-15 19:37 ` /internet Jeffrey A Law
1998-12-16 7:58 ` /internet Tim Hollebeek
1998-12-16 8:41 ` /internet Joe Buck
1998-12-16 11:45 ` /internet Stephen L Moshier
1998-12-16 11:59 ` /internet Joe Buck
1998-12-16 13:19 ` /internet Chip Salzenberg
1998-12-16 16:20 ` /internet Jeffrey A Law
1998-12-16 17:42 ` /internet Joern Rennecke
1998-12-17 9:46 ` /internet Horst von Brand
1998-12-16 16:37 ` /internet Jeffrey A Law
1998-12-16 16:56 ` /internet Per Bothner
1998-12-17 20:20 ` /internet Jeffrey A Law
1998-12-16 17:52 ` /internet Joern Rennecke
1998-12-17 4:43 ` /internet Sylvain Pion
1998-12-17 10:26 ` /internet Craig Burley
1998-12-15 23:08 ` /internet Matthias Urlichs
1998-12-16 9:33 ` /internet Craig Burley
1998-12-16 5:44 ` Stephen L Moshier [this message]
1998-12-16 9:37 ` /internet Craig Burley
-- strict thread matches above, loose matches on Subject: below --
1998-12-16 12:34 /internet Geert Bosch
1998-12-16 13:02 ` /internet Harvey J. Stein
1998-12-16 16:25 ` /internet Jeffrey A Law
1998-12-04 17:41 /internet tprince
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