[Bug tree-optimization/34140] [4.3 Regression] ICE in is_hidden_global_store, at tree-ssa-sink.c:207

[rakdver at kam dot mff dot cuni dot cz]

------- Comment #6 from rakdver at kam dot mff dot cuni dot cz  2007-11-20 13:56 -------
Subject: Re:  [4.3 Regression] ICE in is_hidden_global_store, at
tree-ssa-sink.c:207

> 
> 
> ------- Comment #5 from pinskia at gcc dot gnu dot org  2007-11-20 09:13 -------
> Well I don't think ifcvt is fully to be blamed here:
> 
>   if (D.1542_49 != 0)
>     goto <bb 13>;
>   else
>     goto <bb 12>;
> 
> <bb 12>:
>   # prephitmp.14_44 = PHI <1(13), 0(11)>
>   # rc_45 = PHI <rc_47(13), rc_47(11)>
> 
> Why do we have that last PHI anyways?  Unswitch creates it.

I think more important question is why we do not optimize it out (many
other optimizations, e.g. copy propagation, may create such phi nodes).


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34140