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From: "Jochen Voß" <jochen.voss@googlemail.com>
To: "Andrew Morton" <akpm@linux-foundation.org>
Cc: "Trent Piepho" <tpiepho@freescale.com>,
	djwong@us.ibm.com, khali@linux-fr.org,
	linux-kernel@vger.kernel.org, lm-sensors@lm-sensors.org
Subject: Re: [lm-sensors] [PATCH 1/2] Create a DIV_ROUND_CLOSEST macro to do division with rounding
Date: Tue, 11 Nov 2008 18:50:21 -0500	[thread overview]
Message-ID: <ef1cd66f0811111550x52d4bf1fv23c6e33c8a4b623d@mail.gmail.com> (raw)
In-Reply-To: <20081111152007.ff508e26.akpm@linux-foundation.org>

Hi,

2008/11/11 Andrew Morton <akpm@linux-foundation.org>:
> yup.  I wonder why the compiler doesn't do that for itself - is there a
> case where it will generate a different result?

The test program

    #include <stdio.h>
    int
    main()
    {
        signed int x = -1;
        printf("%d %d\n", x/2, x>>1);
        return 0;
    }

says

    0 -1

so it seems to make a difference.

All the best,
Jochen
-- 
http://seehuhn.de/

  parent reply	other threads:[~2008-11-11 23:58 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-11-11  1:01 Darrick J. Wong
2008-11-11  1:01 ` [PATCH 2/2] adt74{62, 70, 73}: Use DIV_ROUND_CLOSEST for rounded division Darrick J. Wong
2008-11-11 10:04 ` [PATCH 1/2] Create a DIV_ROUND_CLOSEST macro to do division with rounding Jean Delvare
2008-11-11 17:07   ` Andrew Morton
2008-11-11 17:11     ` Jean Delvare
2008-11-11 18:51     ` Joe Perches
2008-11-11 23:05 ` [lm-sensors] " Trent Piepho
2008-11-11 23:20   ` Andrew Morton
2008-11-11 23:42     ` Trent Piepho
2008-11-12  0:08       ` Andrew Morton
2008-11-14 21:46         ` Trent Piepho
2008-11-14 22:24           ` Andrew Morton
2008-11-11 23:50     ` Jochen Voß [this message]
2009-08-03 11:57 ` Peter Zijlstra
2009-08-03 12:21   ` Jean Delvare
2009-08-03 12:27     ` Peter Zijlstra

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