Re: [Valgrind-users] posix_memalign is not handled in valgrind?

[Jeremy F. <je...@go...>]

On Thu, 2003-11-27 at 15:55, Tom Hughes wrote:
>     /* Test whether the SIZE argument is valid.  It must be a power of
>        two multiple of sizeof (void *).  */
>     if (size % sizeof (void *) != 0 || (size & (size - 1)) != 0)
>        return VKI_EINVAL /*22*/ /*EINVAL*/;
> Specifically by the second half of the or condition, which doesn't
> seem to make any sense to me.

N & (N-1) == 0 iff N is a power of 2 - it's the quick idiom to see if a
number is a power of 2 or not.

	J