From: Andrew Haley <aph@redhat.com>
To: gcc-help@gcc.gnu.org
Subject: Re: Is it OK that gcc optimizes away overflow check?
Date: Tue, 26 Jul 2011 17:31:00 -0000 [thread overview]
Message-ID: <4E2EED47.2010806@redhat.com> (raw)
In-Reply-To: <4E2E9873.7060902@redhat.com>
On 07/26/2011 11:35 AM, Andrew Haley wrote:
> Consider
>
> for (i = 0; i < limit; i++)
> f(i * 2);
>
> which can be rewritten to
>
> tmp = limit * 2;
> for (i = 0; i < tmp; i++)
> f(i);
duh.
int tmp = limit * 2;
for (i = 0; i < tmp; i += 2)
f(i);
Andrew.
next prev parent reply other threads:[~2011-07-26 17:31 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-23 20:14 Agner Fog
2011-07-23 21:06 ` Jeffrey Walton
2011-07-25 6:07 ` Ian Lance Taylor
2011-07-25 6:04 ` Ian Lance Taylor
2011-07-25 8:32 ` Agner Fog
2011-07-25 17:18 ` me22
2011-07-25 17:50 ` Ian Lance Taylor
2011-07-26 9:39 ` Agner Fog
2011-07-26 10:35 ` Andrew Haley
2011-07-26 17:31 ` Andrew Haley [this message]
2011-07-27 15:03 ` Agner Fog
2011-07-26 14:55 ` Jeffrey Walton
[not found] ` <4E2E6CC6.3040106@agner.org>
2011-07-26 14:44 ` Ian Lance Taylor
2011-07-26 16:24 ` Agner Fog
2011-07-26 18:17 ` Ian Lance Taylor
2011-07-25 9:43 ` Andrew Haley
2011-07-25 15:38 ` Agner Fog
2011-07-25 16:22 ` Andrew Haley
2011-07-30 23:30 ` Vincent Lefevre
2011-08-01 8:59 ` Andrew Haley
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