Messages in this thread | | | Date | Fri, 3 Nov 2006 18:36:09 +0100 | Subject | Re: New filesystem for Linux | From | Oleg Verych <> |
| |
On Fri, Nov 03, 2006 at 06:09:39PM +0100, Mikulas Patocka wrote: > >In gmane.linux.kernel, you wrote: > >[] > >>From: Andrew Morton <akpm@osdl.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 ____ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |