[Bug tree-optimization/40874] Function object abstraction penalty with inline functions.

[rguenther at suse dot de]

------- Comment #14 from rguenther at suse dot de  2009-07-29 10:57 -------
Subject: Re:  Function object abstraction penalty
 with inline functions.

On Wed, 29 Jul 2009, jamborm at gcc dot gnu dot org wrote:

> ------- Comment #13 from jamborm at gcc dot gnu dot org  2009-07-29 10:16 -------
> (In reply to comment #12)
> > ... at least scheduling FRE is still on the list of possible things
> > todo (can you check if that fixes 3713 as well?)
> > 
> 
> No, it doesn't (unlike the testcase above, for which FRE is enough).
> We have to remove the if-statement in (foo is a function):
> 
>   p$__pfn_25 = foo;
>   D.1739_3 = (int) p$__pfn_25;
>   D.1740_4 = D.1739_3 & 1;
>   if (D.1740_4 != 0)
>     goto <bb 3>;
>   else
>     goto <bb 4>;
> 
> Not even FRE combined with a subsequent fwprop (in their current form)
> can make this happen :-/

FRE has to be teached the & 1 simplification via looking through the
int cast.

Richard.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40874