From: Paolo Bonzini <bonzini@gnu.org>
To: gcc-patches@gcc.gnu.org
Cc: Eric Botcazou <ebotcazou@adacore.com>,
gcc-patches@gcc.gnu.org, Arnaud Charlet <charlet@adacore.com>
Subject: Re: [PATCH] Keep lattice abstract in the SSA propagator, substitue lattice values at defs
Date: Sun, 08 Aug 2010 12:12:00 -0000 [thread overview]
Message-ID: <4C5E9E67.7090004@gnu.org> (raw)
Message-ID: <20100808121200.FYWWkmY8Y6z3HSVn0OSQi1CmsGz4OdlgRiWn75aegsQ@z> (raw)
In-Reply-To: <alpine.LNX.2.00.1008081039350.25856@zhemvz.fhfr.qr>
On 08/08/2010 04:44 AM, Richard Guenther wrote:
> arithmetic. But - we can do so if reassociating constants only
> as in the example above. Because if (L43b_216 - 1) - 2147483648
> doesn't overflow then L43b_216 + 2147483647 doesn't either.
Huh?
a - 1 - 2147483648 is valid if a >= 1.
a + 2147483647 is valid if a < 1.
Paolo
next prev parent reply other threads:[~2010-08-08 12:09 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-08-04 12:22 Richard Guenther
2010-08-04 12:26 ` Arnaud Charlet
2010-08-04 12:29 ` Richard Guenther
2010-08-04 12:31 ` Arnaud Charlet
2010-08-04 12:49 ` Richard Guenther
2010-08-04 12:57 ` Eric Botcazou
2010-08-04 12:58 ` Richard Guenther
2010-08-04 13:27 ` Eric Botcazou
2010-08-08 8:01 ` Eric Botcazou
2010-08-08 8:44 ` Richard Guenther
2010-08-08 12:09 ` Paolo Bonzini [this message]
2010-08-08 12:12 ` Paolo Bonzini
2010-08-08 12:28 ` Richard Guenther
2010-08-08 12:37 ` Richard Guenther
2010-08-08 13:36 ` Richard Guenther
2010-08-08 22:46 ` Eric Botcazou
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