From: Dale Johannesen <dalej@apple.com>
To: Robert Dewar <dewar@gnat.com>
Cc: Luchezar Belev <l_belev@yahoo.com>,
gcc@gcc.gnu.org, Dale Johannesen <dalej@apple.com>,
"Timothy J.Wood" <tjw@omnigroup.com>
Subject: Re: why not consfold sin(const)
Date: Mon, 20 Sep 2004 05:44:00 -0000 [thread overview]
Message-ID: <4BC4FB65-0A9F-11D9-A1E5-000A95D7D16C@apple.com> (raw)
In-Reply-To: <414E24E0.40108@gnat.com>
On Sep 19, 2004, at 5:31 PM, Robert Dewar wrote:
>> Yes; but someone (I forget who) early in this thread said it was
>> "impossible" since you couldn't simulate target-specific elementary
>> functions (presumably they were assuming that the target would have
>> ill-defined or buggy routines).
>
> Ah, now I see the discussion. This thread is actually specifically
> about the possibility of doing this in -ffast-math mode. My
> "impossible" comment was a note about doing it without this
> mode being turned on, and yes it is impossible to simulate
> target routines and precompute at compile-time the exact
> values you will get at run-time (because the algorithms are
> not documented -- which is not quite the same as ill-defined :-)
Well, they *could* be reverse engineered, as there are a finite
number of possible inputs. You'd have to want this an awful lot
to attempt it, though.
next prev parent reply other threads:[~2004-09-20 0:54 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-09-19 16:02 Luchezar Belev
2004-09-19 18:00 ` Robert Dewar
2004-09-19 19:17 ` Luchezar Belev
2004-09-19 19:31 ` Robert Dewar
2004-09-19 19:55 ` Luchezar Belev
2004-09-19 20:25 ` Robert Dewar
2004-09-19 20:34 ` Luchezar Belev
2004-09-19 20:56 ` Zack Weinberg
2004-09-20 8:15 ` Kai Henningsen
2004-09-19 21:12 ` Robert Dewar
2004-09-19 20:53 ` Timothy J.Wood
2004-09-19 22:41 ` Robert Dewar
2004-09-20 0:31 ` Timothy J.Wood
2004-09-20 4:27 ` Robert Dewar
2004-09-20 5:44 ` Dale Johannesen [this message]
2004-09-20 19:43 ` Toon Moene
2004-09-20 20:34 ` Kaveh R. Ghazi
2004-09-20 23:31 ` Robert Dewar
2004-09-21 0:13 ` Scott Robert Ladd
2004-09-21 5:18 ` Steven Bosscher
2004-09-21 5:55 ` Scott Robert Ladd
2004-09-23 11:35 Bradley Lucier
2004-09-23 23:04 ` Toon Moene
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