[Bug tree-optimization/85971] Really Simple "If" with one function call inside is not optimized efficiently

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85971

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #2)
> I think this is actually two different bugs.
> One where cstore is not working when there is a function call inbetween.
> If I add an argument to CreateChecksum and change the first PolyMod to + t
> and the second PolyMod  to * t.  the cstore optimization work.  This is
> recorded now as PR 85987.
> 
> The second one is the lowering of common function calls with slightly
> different arguments.  I thought I saw one asking for this one but I can't
> find it.

Related would be transforming

 if (x)
   foo (a,b,c);
 else
   bar (a,b,c);

to

  fn = x ? foo : bar;
  (*fn) (a,b,c);

(or the reverse?) which might be profitable when optimizing for size
or even when optimizing branch predictor vs. indirect branch/call
predictor usage.