linux-kernel - Re: [lm-sensors] [PATCH 1/2] Create a DIV_ROUND_CLOSEST macro to do division with rounding

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Date:	Tue, 11 Nov 2008 18:50:21 -0500
From:	"Jochen Voß" <jochen.voss@...glemail.com>
To:	"Andrew Morton" <akpm@...ux-foundation.org>
Cc:	"Trent Piepho" <tpiepho@...escale.com>, djwong@...ibm.com,
	khali@...ux-fr.org, linux-kernel@...r.kernel.org,
	lm-sensors@...sensors.org
Subject: Re: [lm-sensors] [PATCH 1/2] Create a DIV_ROUND_CLOSEST macro to do division with rounding

Hi,

2008/11/11 Andrew Morton <akpm@...ux-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/
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