Re: [-mm patch] make kcalloc() a static inline

[Arjan van de Ven]

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)


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