zend_mm_small_size_to_bit

Hi Dmitry, all,

I was looking through a few parts of the new MM last week (cool, thanks! I 
will try soon on my Windows XP), and wasn't sure about the function in the 
subject...

This:

/* higher set bit number (0->0, 1->1, 2->2, 4->3, 8->4, 127->7, 128->8 etc) 
*/
static zend_always_inline int zend_mm_small_size_to_bit(int size)
{
#if defined(__GNUC__)
 return (__builtin_clz(size) ^ 0x1f) + 1;

Will never return 0, right? (Against the comment...)  That's OK I guess 
since, for now, it's only called with size >= 8.

But in that case, this can be removed from the non-GCC version:

if (size == 0) return 0;

Shouldn't have just one version able to return 0? :-/  Unless I'm missing 
something!  Let me know...


Thanks,
Matt