Messages in this thread |  | | Subject | Re: [-mm patch] make kcalloc() a static inline | From | Arjan van de Ven <> | Date | Mon, 15 Aug 2005 11:41:57 +0200 |
| |
On Mon, 2005-08-15 at 12:33 +0300, Denis Vlasenko wrote:
> gcc can optimize that away with non-const n?! I don't think so.
due to the wonders of "value range propagation" it actually can, if the check is done sufficiently before...
gcc keeps track of the range a variable can have at each point, so if the check is done before, the "possible range" will be such that the divide should be optimizable.
(Note: this is a relatively new feature in gcc though)
- 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/
|  |