Messages in this thread | | | Subject | Re: [PATCH] likely cleanup: remove unlikely for kfree(NULL) | From | Arjan van de Ven <> | Date | Wed, 26 Apr 2006 13:03:34 +0200 |
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On Wed, 2006-04-26 at 13:57 +0300, Pekka J Enberg wrote: > On Wed, 26 April 2006 10:27:18 +0200, Arjan van de Ven wrote: > > > > what I would like is kfree to become an inline wrapper that does the > > > > null check inline, that way gcc can optimize it out (and it will in 4.1 > > > > with the VRP pass) if gcc can prove it's not NULL. > > On Wed, 2006-04-26 at 12:05 +0200, Jörn Engel wrote: > > > How well can gcc optimize this case? > > On Wed, 26 Apr 2006, Arjan van de Ven wrote: > > if you deref'd the pointer it'll optimize it away (assuming a new enough > > gcc, like 4.1) > > Here are the numbers for allyesconfig on my setup. > > Pekka > > gcc version 3.4.5 (Gentoo 3.4.5-r1, ssp-3.4.5-1.0, pie-8.7.9)
this is an ancient gcc without VRP so yeah the growth is expected ;)
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