linux-kernel - Re: New filesystem for Linux

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Message-ID: <20061103173609.GA17080@flower.upol.cz>
Date:	Fri, 3 Nov 2006 18:36:09 +0100
From:	Oleg Verych <olecom@...wer.upol.cz>
To:	Mikulas Patocka <mikulas@...ax.karlin.mff.cuni.cz>
Cc:	Andrew Morton <akpm@...l.org>,
	Gabriel C <nix.or.die@...glemail.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: New filesystem for Linux

On Fri, Nov 03, 2006 at 06:09:39PM +0100, Mikulas Patocka wrote:
> >In gmane.linux.kernel, you wrote:
> >[]
> >>From: Andrew Morton <akpm@...l.org>
> >>
> >>As Mikulas points out, (1 << anything) won't be evaluating to zero.
> >
> >How about integer overflow ?
> 
> C standard defines that shifts by more bits than size of a type are 
> undefined (in fact 1<<32 produces 1 on i386, because processor uses only 5 
> bits of a count).
,--
|#include <stdio.h>
|int main(void) {
|	unsigned int b = 1;
|
|	printf("%u\n", (1 << 33));
|	printf("%u\n", (b << 33));
|	return 0;
|}
|$ gcc bit.c && ./a.out
`--

There *is* difference, isn't it?

> Mikulas
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